From 431034f97747210c9c43c27dd6e7506e7891bf3e Mon Sep 17 00:00:00 2001 From: Joe Bowser Date: Wed, 15 Oct 2025 21:45:45 -0700 Subject: [PATCH 1/2] Executorch attempt to nowhere --- app/build.gradle.kts | 12 +- app/src/main/cpp/CMakeLists.txt | 257 +- app/src/main/cpp/config_loader.h | 91 + app/src/main/cpp/image_preprocessor.cpp | 325 + app/src/main/cpp/image_preprocessor.h | 128 + app/src/main/cpp/nanovlm_android.cpp | 546 ++ app/src/main/cpp/nanovlm_preprocessor.h | 102 + app/src/main/cpp/stb_image.h | 7988 +++++++++++++++++ .../baseweight/baseweightsnap/MainActivity.kt | 50 +- .../baseweight/baseweightsnap/ModelManager.kt | 383 +- .../baseweightsnap/NanoVLM_Android.kt | 156 + .../baseweightsnap/SplashActivity.kt | 107 +- rust-tokenizer/Cargo.lock | 1208 +++ rust-tokenizer/Cargo.toml | 23 + rust-tokenizer/include/nanovlm_preprocessor.h | 102 + rust-tokenizer/src/lib.rs | 759 ++ 16 files changed, 12000 insertions(+), 237 deletions(-) create mode 100644 app/src/main/cpp/config_loader.h create mode 100644 app/src/main/cpp/image_preprocessor.cpp create mode 100644 app/src/main/cpp/image_preprocessor.h create mode 100644 app/src/main/cpp/nanovlm_android.cpp create mode 100644 app/src/main/cpp/nanovlm_preprocessor.h create mode 100644 app/src/main/cpp/stb_image.h create mode 100644 app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt create mode 100644 rust-tokenizer/Cargo.lock create mode 100644 rust-tokenizer/Cargo.toml create mode 100644 rust-tokenizer/include/nanovlm_preprocessor.h create mode 100644 rust-tokenizer/src/lib.rs diff --git a/app/build.gradle.kts b/app/build.gradle.kts index 6d785f8..8cc2da9 100644 --- a/app/build.gradle.kts +++ b/app/build.gradle.kts @@ -18,12 +18,16 @@ android { externalNativeBuild { cmake { - arguments("-DANDROID_STL=c++_shared") + arguments( + "-DANDROID_STL=c++_shared", + "-DCMAKE_BUILD_TYPE=Release", + "-DANDROID_ARM_NEON=ON" + ) + cppFlags += "-std=c++17" } - // Don't build 32 bit libraries in 2025 + // Only build arm64-v8a (ExecuTorch only built for this architecture) ndk { abiFilters.add("arm64-v8a") - abiFilters.add("x86_64") } } @@ -54,7 +58,7 @@ android { buildFeatures { viewBinding = true } - ndkVersion = "28.0.12916984 rc3" + ndkVersion = "28.2.13676358" } dependencies { diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt index 58557b3..32493ae 100644 --- a/app/src/main/cpp/CMakeLists.txt +++ b/app/src/main/cpp/CMakeLists.txt @@ -1,50 +1,235 @@ -# For more information about using CMake with Android Studio, read the -# documentation: https://d.android.com/studio/projects/add-native-code.html. -# For more examples on how to use CMake, see https://github.com/android/ndk-samples. - -# Sets the minimum CMake version required for this project. +# CMakeLists.txt for nanoVLM Android with ExecuTorch cmake_minimum_required(VERSION 3.22.1) -# Declares the project name. The project name can be accessed via ${ PROJECT_NAME}, -# Since this is the top level CMakeLists.txt, the project name is also accessible -# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level -# build script scope). project("baseweightsnap") +# Set C++ standard (required for ExecuTorch) +set(CMAKE_CXX_STANDARD 17) +set(CMAKE_CXX_STANDARD_REQUIRED ON) + +# Add compiler definitions to match ExecuTorch build +add_definitions(-DC10_USING_CUSTOM_GENERATED_MACROS) +add_definitions(-DET_ENABLE_PROGRAM_VERIFICATION=0) +add_definitions(-DET_LOG_ENABLED=0) +add_definitions(-DET_MIN_LOG_LEVEL=Info) + # Check if the target architecture is arm64-v8a if(${CMAKE_ANDROID_ARCH_ABI} STREQUAL "arm64-v8a") # Set the C flags for arm64-v8a set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8.4a+dotprod") endif() -set(LLAMA_CURL OFF) -#set(GGML_OPENCL ON) -set(GGML_VULKAN ON) +# ExecuTorch configuration +set(EXECUTORCH_ROOT "/home/bowserj/executorch" CACHE PATH "Path to ExecuTorch root directory") +set(EXECUTORCH_BUILD_DIR "/home/bowserj/executorch/cmake-out-android-arm64" CACHE PATH "Path to ExecuTorch Android build") + +message(STATUS "ExecuTorch root: ${EXECUTORCH_ROOT}") +message(STATUS "ExecuTorch build: ${EXECUTORCH_BUILD_DIR}") + +# ExecuTorch include directories (all the paths needed) +include_directories( + ${EXECUTORCH_ROOT}/.. + ${EXECUTORCH_ROOT} + ${EXECUTORCH_ROOT}/runtime/core + ${EXECUTORCH_ROOT}/runtime/core/exec_aten + ${EXECUTORCH_ROOT}/runtime/core/portable_type + ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10 + ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10/c10 + ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10/c10/macros + ${EXECUTORCH_ROOT}/extension/module + ${EXECUTORCH_ROOT}/extension/tensor + ${EXECUTORCH_BUILD_DIR} +) + +# Rust tokenizer include (relative to cpp directory) +include_directories( + ${CMAKE_CURRENT_SOURCE_DIR}/../../../../rust-tokenizer/include +) + +# nlohmann/json include +include_directories( + ${EXECUTORCH_ROOT}/third-party/json/single_include +) + +# ExecuTorch libraries +add_library(executorch STATIC IMPORTED) +set_target_properties(executorch PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/libexecutorch.a +) + +add_library(executorch_core STATIC IMPORTED) +set_target_properties(executorch_core PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/libexecutorch_core.a +) + +add_library(extension_module_static STATIC IMPORTED) +set_target_properties(extension_module_static PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/module/libextension_module_static.a +) + +add_library(extension_tensor STATIC IMPORTED) +set_target_properties(extension_tensor PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/tensor/libextension_tensor.a +) + +add_library(portable_ops_lib STATIC IMPORTED) +set_target_properties(portable_ops_lib PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kernels/portable/libportable_ops_lib.a +) + +add_library(portable_kernels STATIC IMPORTED) +set_target_properties(portable_kernels PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kernels/portable/libportable_kernels.a +) + +add_library(custom_ops STATIC IMPORTED) +set_target_properties(custom_ops PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/llm/custom_ops/libcustom_ops.a +) + +# Optimized ops (includes SDPA and other optimized kernels) +add_library(optimized_native_cpu_ops_lib STATIC IMPORTED) +set_target_properties(optimized_native_cpu_ops_lib PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/configurations/liboptimized_native_cpu_ops_lib.a +) + +# Optimized kernels (implementations) +add_library(optimized_kernels STATIC IMPORTED) +set_target_properties(optimized_kernels PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kernels/optimized/liboptimized_kernels.a +) + +# CPU BLAS for optimized ops +add_library(cpublas STATIC IMPORTED) +set_target_properties(cpublas PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kernels/optimized/libcpublas.a +) + +# Eigen BLAS for optimized ops +add_library(eigen_blas STATIC IMPORTED) +set_target_properties(eigen_blas PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kernels/optimized/libeigen_blas.a +) + +# XNNPACK backend libraries +add_library(xnnpack_backend STATIC IMPORTED) +set_target_properties(xnnpack_backend PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/backends/xnnpack/libxnnpack_backend.a +) -#load local llama.cpp -add_subdirectory(llama.cpp build-llama) -add_subdirectory(llama.cpp/common build-common) -add_subdirectory(llama.cpp/tools/mtmd build-mtmd) +add_library(XNNPACK STATIC IMPORTED) +set_target_properties(XNNPACK PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/backends/xnnpack/third-party/XNNPACK/libXNNPACK.a +) +add_library(xnnpack_microkernels STATIC IMPORTED) +set_target_properties(xnnpack_microkernels PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/backends/xnnpack/third-party/XNNPACK/libxnnpack-microkernels-prod.a +) + +# XNNPACK dependencies +add_library(cpuinfo STATIC IMPORTED) +set_target_properties(cpuinfo PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/backends/xnnpack/third-party/cpuinfo/libcpuinfo.a +) + +add_library(pthreadpool STATIC IMPORTED) +set_target_properties(pthreadpool PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/backends/xnnpack/third-party/pthreadpool/libpthreadpool.a +) + +# KleidiAI library (for XNNPACK quantized operations) +add_library(kleidiai STATIC IMPORTED) +set_target_properties(kleidiai PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/kleidiai/libkleidiai.a +) + +# ExecuTorch threadpool extension (for SDPA custom ops) +add_library(extension_threadpool STATIC IMPORTED) +set_target_properties(extension_threadpool PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/threadpool/libextension_threadpool.a +) + +# Data loader libraries +add_library(extension_data_loader STATIC IMPORTED) +set_target_properties(extension_data_loader PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/data_loader/libextension_data_loader.a +) + +# Flat tensor libraries +add_library(extension_flat_tensor STATIC IMPORTED) +set_target_properties(extension_flat_tensor PROPERTIES + IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/extension/flat_tensor/libextension_flat_tensor.a +) + +# Note: flatcc libraries are built for x86-64, not aarch64, so we skip them +# add_library(flatcc STATIC IMPORTED) +# set_target_properties(flatcc PROPERTIES +# IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/third-party/flatcc_external_project/lib/libflatcc.a +# ) + +# add_library(flatccrt STATIC IMPORTED) +# set_target_properties(flatccrt PROPERTIES +# IMPORTED_LOCATION ${EXECUTORCH_BUILD_DIR}/third-party/flatcc_external_project/lib/libflatccrt.a +# ) + +# Rust tokenizer library (will be built for Android) +add_library(nanovlm_preprocessor STATIC IMPORTED) +set_target_properties(nanovlm_preprocessor PROPERTIES + IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/../../../../rust-tokenizer/target/aarch64-linux-android/release/libnanovlm_preprocessor.a +) + +# Main shared library add_library(${CMAKE_PROJECT_NAME} SHARED - # List C/C++ source files with relative paths to this CMakeLists.txt. - mtmd-android.cpp - model_manager.cpp) - -# Add include directories -target_include_directories(${CMAKE_PROJECT_NAME} PUBLIC - ${CMAKE_CURRENT_SOURCE_DIR}/llama.cpp/common - ${CMAKE_CURRENT_SOURCE_DIR}/llama.cpp/tools/mtmd - ${CMAKE_CURRENT_SOURCE_DIR}/llama.cpp/src - ${CMAKE_CURRENT_SOURCE_DIR}/llama.cpp/ggml/src) - -# Specifies libraries CMake should link to your target library. You -# can link libraries from various origins, such as libraries defined in this -# build script, prebuilt third-party libraries, or Android system libraries. + nanovlm_android.cpp + image_preprocessor.cpp +) + +# Include directories for our code +target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE + ${CMAKE_CURRENT_SOURCE_DIR} +) + +# Link libraries target_link_libraries(${CMAKE_PROJECT_NAME} - # List libraries link to the target library - llama - common - mtmd_shared - android - log) \ No newline at end of file + # ExecuTorch core + executorch + executorch_core + extension_module_static + extension_tensor + + # Data loaders and flat tensor support + extension_data_loader + extension_flat_tensor + # flatcc and flatccrt are built for x86-64, not aarch64 + + # Operators - XNNPACK backend + custom ops (including SDPA) + # Use --whole-archive to ensure operator registration symbols are not stripped + -Wl,--whole-archive + xnnpack_backend + portable_ops_lib + portable_kernels + custom_ops + -Wl,--no-whole-archive + + # XNNPACK core library and dependencies (don't need whole-archive) + XNNPACK + xnnpack_microkernels + kleidiai + cpuinfo + pthreadpool + + # Optimized BLAS for SDPA custom ops + cpublas + eigen_blas + extension_threadpool + + # Rust tokenizer + nanovlm_preprocessor + + # Android system libraries + android + log +) + +message(STATUS "Configured nanoVLM Android with ExecuTorch (portable ops)") diff --git a/app/src/main/cpp/config_loader.h b/app/src/main/cpp/config_loader.h new file mode 100644 index 0000000..83d850f --- /dev/null +++ b/app/src/main/cpp/config_loader.h @@ -0,0 +1,91 @@ +#ifndef CONFIG_LOADER_H +#define CONFIG_LOADER_H + +#include +#include +#include +#include +#include + +using json = nlohmann::json; + +struct NanoVLMConfig { + size_t vit_img_size; + size_t vit_hidden_dim; + size_t lm_hidden_dim; + size_t lm_n_heads; + size_t lm_n_kv_heads; + size_t lm_n_blocks; + size_t lm_vocab_size; + size_t mp_image_token_length; + std::string image_token; + std::string global_image_token; + std::string lm_tokenizer; + + // Image splitting parameters + size_t max_img_size; + size_t splitted_image_size; + bool resize_to_max_side_len; +}; + +inline NanoVLMConfig load_config(const std::string& config_path) { + std::ifstream file(config_path); + if (!file.is_open()) { + throw std::runtime_error("Failed to open config file: " + config_path); + } + + json j; + try { + file >> j; + } catch (const json::parse_error& e) { + throw std::runtime_error(std::string("Failed to parse JSON: ") + e.what()); + } + + NanoVLMConfig config; + + try { + config.vit_img_size = j["vit_img_size"]; + config.vit_hidden_dim = j["vit_hidden_dim"]; + config.lm_hidden_dim = j["lm_hidden_dim"]; + config.lm_n_heads = j["lm_n_heads"]; + config.lm_n_kv_heads = j["lm_n_kv_heads"]; + config.lm_n_blocks = j["lm_n_blocks"]; + config.lm_vocab_size = j["lm_vocab_size"]; + config.mp_image_token_length = j["mp_image_token_length"]; + + // Extract tokens from vlm_extra_tokens + if (j.contains("vlm_extra_tokens")) { + const auto& extra_tokens = j["vlm_extra_tokens"]; + config.image_token = extra_tokens.value("image_token", "<|image|>"); + config.global_image_token = extra_tokens.value("global_image_token", "<|global_image|>"); + } else { + config.image_token = "<|image|>"; + config.global_image_token = "<|global_image|>"; + } + + config.lm_tokenizer = j["lm_tokenizer"]; + + // Image splitting parameters with defaults + config.max_img_size = j.value("max_img_size", 2048); + config.splitted_image_size = j.value("splitted_image_size", 512); + config.resize_to_max_side_len = j.value("resize_to_max_side_len", false); + + std::cout << "Loaded config:" << std::endl; + std::cout << " vit_img_size: " << config.vit_img_size << std::endl; + std::cout << " lm_hidden_dim: " << config.lm_hidden_dim << std::endl; + std::cout << " lm_n_blocks: " << config.lm_n_blocks << std::endl; + std::cout << " mp_image_token_length: " << config.mp_image_token_length << std::endl; + std::cout << " image_token: " << config.image_token << std::endl; + std::cout << " global_image_token: " << config.global_image_token << std::endl; + std::cout << " max_img_size: " << config.max_img_size << std::endl; + std::cout << " splitted_image_size: " << config.splitted_image_size << std::endl; + std::cout << " resize_to_max_side_len: " << (config.resize_to_max_side_len ? "true" : "false") << std::endl; + + } catch (const json::exception& e) { + throw std::runtime_error(std::string("Failed to extract config values: ") + e.what()); + } + + return config; +} + +#endif // CONFIG_LOADER_H diff --git a/app/src/main/cpp/image_preprocessor.cpp b/app/src/main/cpp/image_preprocessor.cpp new file mode 100644 index 0000000..eaa8ad1 --- /dev/null +++ b/app/src/main/cpp/image_preprocessor.cpp @@ -0,0 +1,325 @@ +#include "image_preprocessor.h" +#include +#include +#include +#include + +// Define STB_IMAGE_IMPLEMENTATION before including stb_image.h +#define STB_IMAGE_IMPLEMENTATION +#include "stb_image.h" + +namespace nanovlm { + +// Helper: clip value to range [lower, upper] +static inline int clip(int x, int lower, int upper) { + return std::max(lower, std::min(x, upper)); +} + +// Helper: align to nearest multiple (rounds up) +static inline int align_up(int x, int n) { + return ((x + n - 1) / n) * n; +} + +Image load_image(const std::string& image_path) { + int width, height, channels; + unsigned char* data = stbi_load(image_path.c_str(), &width, &height, &channels, 3); + + if (!data) { + throw std::runtime_error("Failed to load image: " + image_path); + } + + Image img(width, height); + + // Copy RGB data + size_t data_size = 3 * width * height; + std::copy(data, data + data_size, img.data.begin()); + + stbi_image_free(data); + + return img; +} + +void bicubic_resize(const Image& src, Image& dst, int target_width, int target_height) { + const int nx = src.width; + const int ny = src.height; + + dst.width = target_width; + dst.height = target_height; + dst.data.resize(3 * target_width * target_height); + + float Cc; + float C[5] = {}; + float d0, d2, d3, a0, a1, a2, a3; + int i, j, k, jj; + int x, y; + float dx, dy; + float tx, ty; + + tx = (float)nx / (float)target_width; + ty = (float)ny / (float)target_height; + + // Bicubic interpolation; adapted from ViT.cpp, inspired from: + // -> https://github.com/yglukhov/bicubic-interpolation-image-processing/blob/master/libimage.c#L36 + // -> https://en.wikipedia.org/wiki/Bicubic_interpolation + + for (i = 0; i < target_height; i++) { + for (j = 0; j < target_width; j++) { + x = (int)(tx * j); + y = (int)(ty * i); + + dx = tx * j - x; + dy = ty * i - y; + + for (k = 0; k < 3; k++) { + for (jj = 0; jj <= 3; jj++) { + d0 = src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x - 1, 0, nx - 1)) * 3 + k] + - src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x, 0, nx - 1)) * 3 + k]; + d2 = src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x + 1, 0, nx - 1)) * 3 + k] + - src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x, 0, nx - 1)) * 3 + k]; + d3 = src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x + 2, 0, nx - 1)) * 3 + k] + - src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x, 0, nx - 1)) * 3 + k]; + a0 = src.data[(clip(y - 1 + jj, 0, ny - 1) * nx + clip(x, 0, nx - 1)) * 3 + k]; + + a1 = -1.0 / 3 * d0 + d2 - 1.0 / 6 * d3; + a2 = 1.0 / 2 * d0 + 1.0 / 2 * d2; + a3 = -1.0 / 6 * d0 - 1.0 / 2 * d2 + 1.0 / 6 * d3; + + C[jj] = a0 + a1 * dx + a2 * dx * dx + a3 * dx * dx * dx; + + d0 = C[0] - C[1]; + d2 = C[2] - C[1]; + d3 = C[3] - C[1]; + a0 = C[1]; + a1 = -1.0 / 3 * d0 + d2 - 1.0 / 6 * d3; + a2 = 1.0 / 2 * d0 + 1.0 / 2 * d2; + a3 = -1.0 / 6 * d0 - 1.0 / 2 * d2 + 1.0 / 6 * d3; + Cc = a0 + a1 * dy + a2 * dy * dy + a3 * dy * dy * dy; + + const uint8_t Cc2 = std::min(std::max(std::round(Cc), 0.0f), 255.0f); + dst.data[(i * target_width + j) * 3 + k] = Cc2; + } + } + } + } +} + +PreprocessedImage rgb_to_chw_normalized(const Image& img) { + PreprocessedImage result(3, img.height, img.width); + + // Convert from HWC (RGB interleaved) to CHW format and normalize to [0, 1] + for (int c = 0; c < 3; c++) { + for (int y = 0; y < img.height; y++) { + for (int x = 0; x < img.width; x++) { + int src_idx = (y * img.width + x) * 3 + c; + int dst_idx = c * img.height * img.width + y * img.width + x; + result.data[dst_idx] = img.data[src_idx] / 255.0f; + } + } + } + + return result; +} + +std::pair compute_dynamic_resize( + int orig_h, int orig_w, + int max_side_len, int patch_size, + bool resize_to_max +) { + int long_side = std::max(orig_w, orig_h); + int short_side = std::min(orig_w, orig_h); + + // Compute target long side + int target_long; + if (resize_to_max) { + target_long = max_side_len; + } else { + target_long = std::min(max_side_len, align_up(long_side, patch_size)); + } + + // Scale factor + double scale = static_cast(target_long) / static_cast(long_side); + + // Compute short side with ceiling to never undershoot + int target_short = std::max( + patch_size, + static_cast(std::ceil(short_side * scale / patch_size) * patch_size) + ); + + // Return (height, width) + if (orig_w >= orig_h) { + return {target_short, target_long}; + } else { + return {target_long, target_short}; + } +} + +Image crop_image(const Image& src, int x, int y, int width, int height) { + if (x < 0 || y < 0 || x + width > src.width || y + height > src.height) { + throw std::runtime_error("Crop region out of bounds"); + } + + Image dst(width, height); + + for (int i = 0; i < height; i++) { + for (int j = 0; j < width; j++) { + int src_idx = ((y + i) * src.width + (x + j)) * 3; + int dst_idx = (i * width + j) * 3; + dst.data[dst_idx] = src.data[src_idx]; + dst.data[dst_idx + 1] = src.data[src_idx + 1]; + dst.data[dst_idx + 2] = src.data[src_idx + 2]; + } + } + + return dst; +} + +MultiImageResult preprocess_image_with_splitting( + const std::string& image_path, + int max_side_len, + int patch_size, + bool resize_to_max +) { + MultiImageResult result; + + // 1. Load image + Image img = load_image(image_path); + std::cout << "Loaded image: " << img.width << "x" << img.height << std::endl; + + // 2. Compute dynamic resize dimensions + auto [new_h, new_w] = compute_dynamic_resize( + img.height, img.width, + max_side_len, patch_size, + resize_to_max + ); + std::cout << "Dynamic resize to: " << new_w << "x" << new_h << std::endl; + + // 3. Resize image + Image resized; + bicubic_resize(img, resized, new_w, new_h); + std::cout << "Resized image: " << resized.width << "x" << resized.height << std::endl; + + // 4. Calculate grid dimensions + int grid_h = new_h / patch_size; + int grid_w = new_w / patch_size; + result.grid_h = grid_h; + result.grid_w = grid_w; + + std::cout << "Grid: " << grid_h << "x" << grid_w << " (" << (grid_h * grid_w) << " patches)" << std::endl; + + // 5. Create images + if (grid_h == 1 && grid_w == 1) { + // Only one patch - don't add global view + PreprocessedImage patch = rgb_to_chw_normalized(resized); + result.images.push_back(std::move(patch)); + std::cout << "Single patch mode (no global view)" << std::endl; + } else { + // Multiple patches - add global view first (bicubic downsampled) + Image global_img; + bicubic_resize(resized, global_img, patch_size, patch_size); + PreprocessedImage global_preprocessed = rgb_to_chw_normalized(global_img); + result.images.push_back(std::move(global_preprocessed)); + std::cout << "Added global view: " << patch_size << "x" << patch_size << std::endl; + + // Add all patches + for (int row = 0; row < grid_h; row++) { + for (int col = 0; col < grid_w; col++) { + int x = col * patch_size; + int y = row * patch_size; + + Image patch = crop_image(resized, x, y, patch_size, patch_size); + PreprocessedImage patch_preprocessed = rgb_to_chw_normalized(patch); + result.images.push_back(std::move(patch_preprocessed)); + } + } + std::cout << "Added " << (grid_h * grid_w) << " patches" << std::endl; + } + + std::cout << "Total images: " << result.images.size() << std::endl; + + return result; +} + +MultiImageResult preprocess_image_from_argb_buffer( + const uint8_t* argb_buffer, + int width, + int height, + int max_side_len, + int patch_size, + bool resize_to_max +) { + // Convert ARGB to RGB + Image img(width, height); + + for (int y = 0; y < height; y++) { + for (int x = 0; x < width; x++) { + int src_idx = (y * width + x) * 4; // ARGB: 4 bytes per pixel + int dst_idx = (y * width + x) * 3; // RGB: 3 bytes per pixel + + // ARGB -> RGB (skip alpha channel) + img.data[dst_idx + 0] = argb_buffer[src_idx + 1]; // R + img.data[dst_idx + 1] = argb_buffer[src_idx + 2]; // G + img.data[dst_idx + 2] = argb_buffer[src_idx + 3]; // B + } + } + + // Now apply same preprocessing as file-based version + MultiImageResult result; + + // 1. Load completed (already have RGB data) + std::cout << "Loaded image from buffer: " << width << "x" << height << std::endl; + + // 2. Compute dynamic resize dimensions + auto [new_h, new_w] = compute_dynamic_resize( + img.height, img.width, + max_side_len, patch_size, + resize_to_max + ); + std::cout << "Dynamic resize to: " << new_w << "x" << new_h << std::endl; + + // 3. Resize image + Image resized; + bicubic_resize(img, resized, new_w, new_h); + std::cout << "Resized image: " << resized.width << "x" << resized.height << std::endl; + + // 4. Calculate grid dimensions + int grid_h = new_h / patch_size; + int grid_w = new_w / patch_size; + result.grid_h = grid_h; + result.grid_w = grid_w; + + std::cout << "Grid: " << grid_h << "x" << grid_w << " (" << (grid_h * grid_w) << " patches)" << std::endl; + + // 5. Create images + if (grid_h == 1 && grid_w == 1) { + // Only one patch - don't add global view + PreprocessedImage patch = rgb_to_chw_normalized(resized); + result.images.push_back(std::move(patch)); + std::cout << "Single patch mode (no global view)" << std::endl; + } else { + // Multiple patches - add global view first (bicubic downsampled) + Image global_img; + bicubic_resize(resized, global_img, patch_size, patch_size); + PreprocessedImage global_preprocessed = rgb_to_chw_normalized(global_img); + result.images.push_back(std::move(global_preprocessed)); + std::cout << "Added global view: " << patch_size << "x" << patch_size << std::endl; + + // Add all patches + for (int row = 0; row < grid_h; row++) { + for (int col = 0; col < grid_w; col++) { + int x = col * patch_size; + int y = row * patch_size; + + Image patch = crop_image(resized, x, y, patch_size, patch_size); + PreprocessedImage patch_preprocessed = rgb_to_chw_normalized(patch); + result.images.push_back(std::move(patch_preprocessed)); + } + } + std::cout << "Added " << (grid_h * grid_w) << " patches" << std::endl; + } + + std::cout << "Total images: " << result.images.size() << std::endl; + + return result; +} + +} // namespace nanovlm diff --git a/app/src/main/cpp/image_preprocessor.h b/app/src/main/cpp/image_preprocessor.h new file mode 100644 index 0000000..c31a91c --- /dev/null +++ b/app/src/main/cpp/image_preprocessor.h @@ -0,0 +1,128 @@ +#pragma once + +#include +#include +#include +#include + +/** + * Standalone image preprocessing for nanoVLM + * Based on llama.cpp's bicubic resize and Python's preprocessing logic + * No GGML dependencies + */ + +namespace nanovlm { + +// Image structure (RGB uint8) +struct Image { + int width; + int height; + std::vector data; // RGB format: RGBRGBRGB... + + Image() : width(0), height(0) {} + Image(int w, int h) : width(w), height(h), data(3 * w * h) {} + + size_t size() const { return data.size(); } +}; + +// Preprocessed image data (CHW float32 format, normalized to [0, 1]) +struct PreprocessedImage { + std::vector data; // CHW format + int width; + int height; + int channels; + + PreprocessedImage() : width(0), height(0), channels(0) {} + PreprocessedImage(int c, int h, int w) + : data(c * h * w), width(w), height(h), channels(c) {} +}; + +// Multiple images with grid information +struct MultiImageResult { + std::vector images; // [global_view, patch1, patch2, ...] + size_t grid_h; // Number of patches in height + size_t grid_w; // Number of patches in width + + MultiImageResult() : grid_h(0), grid_w(0) {} +}; + +/** + * Load image from file using stb_image + * Returns Image in RGB format + */ +Image load_image(const std::string& image_path); + +/** + * Bicubic resize (matches Python's torchvision BICUBIC) + * Based on llama.cpp implementation + */ +void bicubic_resize(const Image& src, Image& dst, int target_width, int target_height); + +/** + * Convert RGB uint8 image to CHW float32 format, normalized to [0, 1] + */ +PreprocessedImage rgb_to_chw_normalized(const Image& img); + +/** + * Compute dynamic resize dimensions (matches Python's DynamicResize) + * + * @param orig_h Original height + * @param orig_w Original width + * @param max_side_len Maximum side length + * @param patch_size Patch size for alignment + * @param resize_to_max If true, always resize long side to max_side_len + * @return Pair of (new_height, new_width) + */ +std::pair compute_dynamic_resize( + int orig_h, int orig_w, + int max_side_len, int patch_size, + bool resize_to_max +); + +/** + * Crop image to specified region + */ +Image crop_image(const Image& src, int x, int y, int width, int height); + +/** + * Preprocess image with dynamic resizing and splitting + * Matches Python's preprocessing pipeline: + * 1. Dynamic resize preserving aspect ratio + * 2. Split into patches + * 3. Create global view (bicubic downsampled) + patches + * + * @param image_path Path to image file + * @param max_side_len Maximum side length (e.g., 2048) + * @param patch_size Size of each patch (e.g., 512) + * @param resize_to_max If true, always resize to max_side_len + * @return MultiImageResult with global view + patches + */ +MultiImageResult preprocess_image_with_splitting( + const std::string& image_path, + int max_side_len, + int patch_size, + bool resize_to_max +); + +/** + * Preprocess image from ARGB buffer (for Android) + * Converts ARGB8888 to RGB, then applies same preprocessing as above + * + * @param argb_buffer ARGB8888 buffer from Android + * @param width Image width + * @param height Image height + * @param max_side_len Maximum side length (e.g., 2048) + * @param patch_size Size of each patch (e.g., 512) + * @param resize_to_max If true, always resize to max_side_len + * @return MultiImageResult with global view + patches + */ +MultiImageResult preprocess_image_from_argb_buffer( + const uint8_t* argb_buffer, + int width, + int height, + int max_side_len, + int patch_size, + bool resize_to_max +); + +} // namespace nanovlm diff --git a/app/src/main/cpp/nanovlm_android.cpp b/app/src/main/cpp/nanovlm_android.cpp new file mode 100644 index 0000000..37fc81a --- /dev/null +++ b/app/src/main/cpp/nanovlm_android.cpp @@ -0,0 +1,546 @@ +/** + * @file nanovlm_android.cpp + * @brief JNI wrapper for nanoVLM ExecuTorch inference on Android + * + * This file provides JNI bindings for running nanoVLM inference using ExecuTorch. + * It replaces the llama.cpp-based SmolVLM2 implementation with a more efficient + * and compatible solution. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "nanovlm_preprocessor.h" // Rust tokenizer FFI +#include "image_preprocessor.h" // C++ image preprocessing +#include "config_loader.h" // Config loading + +#define TAG "nanovlm-android" +#define LOGi(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__) +#define LOGe(...) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__) +#define LOGd(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__) + +using namespace torch::executor; +using executorch::extension::from_blob; +using executorch::extension::TensorPtr; +using executorch::extension::clone_tensor_ptr; +using executorch::runtime::EValue; + +// Global instance of the inference engine +class NanoVLMAndroidInference { +private: + std::unique_ptr vision_encoder_; + std::unique_ptr modality_projector_; + std::unique_ptr prefill_decoder_; + std::unique_ptr decode_decoder_; + std::unique_ptr token_embedding_; + std::unique_ptr lm_head_; + + TokenizerHandle* tokenizer_; + NanoVLMConfig config_; + + // Store preprocessed image data between calls + nanovlm::MultiImageResult current_image_data_; + std::vector> current_image_embeddings_; + bool has_image_ = false; + +public: + NanoVLMAndroidInference() : tokenizer_(nullptr) {} + + ~NanoVLMAndroidInference() { + if (tokenizer_) { + nanovlm_free_tokenizer(tokenizer_); + } + } + + bool loadModels(const std::string& model_dir, const std::string& tokenizer_path) { + try { + LOGi("Loading nanoVLM models from %s", model_dir.c_str()); + + // Load config + config_ = load_config(model_dir + "/config.json"); + LOGi("Config loaded successfully"); + + // Load ExecuTorch modules + LOGi("Loading vision encoder from: %s", (model_dir + "/vision_encoder.pte").c_str()); + vision_encoder_ = std::make_unique(model_dir + "/vision_encoder.pte"); + LOGi("Vision encoder loaded successfully"); + + // Check if module loaded correctly + auto method_names = vision_encoder_->method_names(); + if (method_names.ok()) { + LOGi("Vision encoder has %zu methods", method_names.get().size()); + for (const auto& name : method_names.get()) { + LOGi(" - Method: %s", name.c_str()); + } + } else { + LOGe("Failed to get vision encoder method names: error %d", (int)method_names.error()); + } + + LOGi("Loading modality projector from: %s", (model_dir + "/modality_projector.pte").c_str()); + modality_projector_ = std::make_unique(model_dir + "/modality_projector.pte"); + LOGi("Modality projector loaded successfully"); + + prefill_decoder_ = std::make_unique(model_dir + "/language_decoder_prefill.pte"); + LOGi("Prefill decoder loaded"); + + decode_decoder_ = std::make_unique(model_dir + "/language_decoder_decode.pte"); + LOGi("Decode decoder loaded"); + + token_embedding_ = std::make_unique(model_dir + "/token_embedding.pte"); + LOGi("Token embedding loaded"); + + lm_head_ = std::make_unique(model_dir + "/lm_head.pte"); + LOGi("LM head loaded"); + + // Load tokenizer + tokenizer_ = nanovlm_load_tokenizer(tokenizer_path.c_str(), config_.image_token.c_str()); + if (!tokenizer_) { + LOGe("Failed to load tokenizer from %s", tokenizer_path.c_str()); + return false; + } + LOGi("Tokenizer loaded successfully"); + + return true; + } catch (const std::exception& e) { + LOGe("Failed to load models: %s", e.what()); + return false; + } + } + + bool processImageFromBuffer(const uint8_t* argb_buffer, int width, int height) { + try { + LOGi("Processing image from buffer (%dx%d)", width, height); + + // Convert ARGB to RGB and preprocess + current_image_data_ = nanovlm::preprocess_image_from_argb_buffer( + argb_buffer, width, height, + config_.max_img_size, + config_.splitted_image_size, + config_.resize_to_max_side_len + ); + + if (current_image_data_.images.empty()) { + LOGe("Failed to preprocess image"); + return false; + } + + LOGi("Image preprocessing complete: %zu images, grid %zux%zu", + current_image_data_.images.size(), + current_image_data_.grid_h, + current_image_data_.grid_w); + + // Run vision encoder on all images + current_image_embeddings_.clear(); + for (size_t img_idx = 0; img_idx < current_image_data_.images.size(); img_idx++) { + auto& img = current_image_data_.images[img_idx]; + + // Create tensor + std::vector image_shape = {1, (int32_t)img.channels, + (int32_t)img.height, (int32_t)img.width}; + + // Sanity check: verify data is in reasonable range [0, 1] + float min_val = *std::min_element(img.data.begin(), img.data.end()); + float max_val = *std::max_element(img.data.begin(), img.data.end()); + + LOGi("Running vision encoder on image %zu: shape [%d, %d, %d, %d], data range [%.3f, %.3f]", + img_idx, image_shape[0], image_shape[1], image_shape[2], image_shape[3], min_val, max_val); + + auto image_tensor = from_blob(img.data.data(), image_shape, ScalarType::Float); + + // Run vision encoder + std::vector vision_inputs = {image_tensor}; + auto vision_result = vision_encoder_->forward(vision_inputs); + if (!vision_result.ok()) { + LOGe("Vision encoder forward failed for image %zu: error code %d", + img_idx, (int)vision_result.error()); + return false; + } + + // Run modality projector + std::vector proj_inputs = {vision_result.get()[0]}; + auto proj_result = modality_projector_->forward(proj_inputs); + if (!proj_result.ok()) { + LOGe("Modality projector forward failed"); + return false; + } + + // Extract embeddings + const auto& img_emb_tensor = proj_result.get()[0].toTensor(); + size_t emb_size = config_.mp_image_token_length * config_.lm_hidden_dim; + std::vector embeddings(emb_size); + const float* emb_ptr = img_emb_tensor.const_data_ptr(); + std::memcpy(embeddings.data(), emb_ptr, emb_size * sizeof(float)); + + current_image_embeddings_.push_back(embeddings); + } + + LOGi("Vision encoding complete: %zu image embeddings", current_image_embeddings_.size()); + has_image_ = true; + return true; + + } catch (const std::exception& e) { + LOGe("Image processing failed: %s", e.what()); + return false; + } + } + + // Greedy sampling + int64_t sample_token(const std::vector& logits) { + auto max_it = std::max_element(logits.begin(), logits.end()); + return std::distance(logits.begin(), max_it); + } + + // Extract hidden state for a specific token + std::vector extract_token_hidden_state(const EValue& hidden_states_eval, size_t token_index) { + const auto& tensor = hidden_states_eval.toTensor(); + const float* data_ptr = tensor.const_data_ptr(); + auto sizes = tensor.sizes(); + size_t hidden_dim = sizes[2]; + + std::vector hidden_state(hidden_dim); + size_t offset = token_index * hidden_dim; + std::memcpy(hidden_state.data(), data_ptr + offset, hidden_dim * sizeof(float)); + return hidden_state; + } + + // Run LM head + std::vector get_logits(const std::vector& hidden_state) { + std::vector hidden_copy = hidden_state; + std::vector hidden_shape = {1, 1, (int32_t)config_.lm_hidden_dim}; + auto hidden_tensor = from_blob(hidden_copy.data(), hidden_shape, ScalarType::Float); + + std::vector lm_inputs = {hidden_tensor}; + auto lm_result = lm_head_->forward(lm_inputs); + if (!lm_result.ok()) { + throw std::runtime_error("LM head forward failed"); + } + + const auto& logits_tensor = lm_result.get()[0].toTensor(); + const float* logits_ptr = logits_tensor.const_data_ptr(); + + std::vector logits(config_.lm_vocab_size); + std::memcpy(logits.data(), logits_ptr, config_.lm_vocab_size * sizeof(float)); + return logits; + } + + // Generate image string with grid tokens + std::string get_image_string(size_t grid_h, size_t grid_w) { + std::string image_string; + + if (grid_h > 1 || grid_w > 1) { + image_string += config_.global_image_token; + for (size_t i = 0; i < config_.mp_image_token_length; i++) { + image_string += config_.image_token; + } + } + + for (size_t row = 0; row < grid_h; row++) { + for (size_t col = 0; col < grid_w; col++) { + image_string += ""; + for (size_t i = 0; i < config_.mp_image_token_length; i++) { + image_string += config_.image_token; + } + } + } + + return image_string; + } + + std::string generateResponse(const std::string& prompt, int max_new_tokens) { + if (!has_image_) { + throw std::runtime_error("No image processed"); + } + + try { + LOGi("Starting generation (max %d tokens)", max_new_tokens); + + // Concatenate image embeddings + size_t total_image_tokens = current_image_embeddings_.size() * config_.mp_image_token_length; + std::vector combined_image_embeddings(total_image_tokens * config_.lm_hidden_dim); + + for (size_t i = 0; i < current_image_embeddings_.size(); i++) { + size_t offset = i * config_.mp_image_token_length * config_.lm_hidden_dim; + std::memcpy(combined_image_embeddings.data() + offset, + current_image_embeddings_[i].data(), + current_image_embeddings_[i].size() * sizeof(float)); + } + + // Format prompt with chat template + std::string image_string = get_image_string(current_image_data_.grid_h, current_image_data_.grid_w); + std::string formatted_prompt = "<|im_start|>user\n" + image_string + prompt + "<|im_end|>\n<|im_start|>assistant\n"; + + // Tokenize + TokenizationResult tok_result = nanovlm_tokenize(tokenizer_, formatted_prompt.c_str(), 0); + if (!tok_result.token_ids) { + throw std::runtime_error("Tokenization failed"); + } + + LOGi("Tokenization complete: %zu tokens", tok_result.num_tokens); + + // Get token embeddings + std::vector token_shape = {1, (int32_t)tok_result.num_tokens}; + auto token_tensor = from_blob(tok_result.token_ids, token_shape, ScalarType::Long); + + std::vector token_inputs = {token_tensor}; + auto token_emb_result = token_embedding_->forward(token_inputs); + if (!token_emb_result.ok()) { + nanovlm_free_tokenization_result(tok_result); + throw std::runtime_error("Token embedding forward failed"); + } + + const auto& text_emb_tensor = token_emb_result.get()[0].toTensor(); + + // Combine embeddings + size_t total_tokens = tok_result.num_tokens; + size_t hidden_dim = config_.lm_hidden_dim; + std::vector combined_embeddings(total_tokens * hidden_dim); + const float* text_emb_ptr = text_emb_tensor.const_data_ptr(); + std::memcpy(combined_embeddings.data(), text_emb_ptr, total_tokens * hidden_dim * sizeof(float)); + + // Replace image tokens + const int64_t IMAGE_TOKEN_ID = 49152; + const int64_t GLOBAL_IMAGE_TOKEN_ID = 49153; + size_t image_emb_idx = 0; + + for (size_t pos = 0; pos < total_tokens; pos++) { + int64_t token_id = tok_result.token_ids[pos]; + if ((token_id == IMAGE_TOKEN_ID || token_id == GLOBAL_IMAGE_TOKEN_ID) && image_emb_idx < total_image_tokens) { + size_t src_offset = image_emb_idx * hidden_dim; + size_t dst_offset = pos * hidden_dim; + std::memcpy(combined_embeddings.data() + dst_offset, + combined_image_embeddings.data() + src_offset, + hidden_dim * sizeof(float)); + image_emb_idx++; + } + } + + // Create attention mask and position IDs + std::vector mask_data(total_tokens, 1); + std::vector mask_shape = {1, (int32_t)total_tokens}; + auto attention_mask = from_blob(mask_data.data(), mask_shape, ScalarType::Long); + + std::vector pos_data(total_tokens); + for (size_t i = 0; i < total_tokens; i++) pos_data[i] = i; + auto position_ids = from_blob(pos_data.data(), mask_shape, ScalarType::Long); + + std::vector combined_shape = {1, (int32_t)total_tokens, (int32_t)hidden_dim}; + auto combined_tensor = from_blob(combined_embeddings.data(), combined_shape, ScalarType::Float); + + // Run prefill + LOGi("Running prefill..."); + std::vector prefill_inputs = {combined_tensor, attention_mask, position_ids}; + auto prefill_result = prefill_decoder_->forward(prefill_inputs); + if (!prefill_result.ok()) { + nanovlm_free_tokenization_result(tok_result); + throw std::runtime_error("Prefill failed"); + } + + auto& prefill_outputs = prefill_result.get(); + const auto& prefill_hidden = prefill_outputs[0]; + + // Clone KV cache (fixes reference invalidation bug!) + std::vector kv_cache_storage; + kv_cache_storage.reserve(prefill_outputs.size() - 1); + for (size_t i = 1; i < prefill_outputs.size(); i++) { + const auto& tensor = prefill_outputs[i].toTensor(); + kv_cache_storage.push_back(clone_tensor_ptr(tensor)); + } + + // Get first token + auto last_hidden = extract_token_hidden_state(prefill_hidden, total_tokens - 1); + auto logits = get_logits(last_hidden); + int64_t next_token = sample_token(logits); + + std::vector generated_tokens; + generated_tokens.push_back(next_token); + size_t current_seq_len = total_tokens; + + LOGi("Starting decode loop..."); + const int64_t eos_token_id = 2; + + // Decode loop + for (int step = 1; step < max_new_tokens; step++) { + // Get embedding for new token + std::vector token_id_vec = {next_token}; + std::vector single_token_shape = {1, 1}; + auto single_token_tensor = from_blob(token_id_vec.data(), single_token_shape, ScalarType::Long); + + std::vector emb_inputs = {single_token_tensor}; + auto emb_result = token_embedding_->forward(emb_inputs); + if (!emb_result.ok()) break; + + const auto& token_emb = emb_result.get()[0]; + + // Create decode inputs + std::vector decode_mask(current_seq_len + 1, 1); + std::vector decode_mask_shape = {1, (int32_t)(current_seq_len + 1)}; + auto decode_attention_mask = from_blob(decode_mask.data(), decode_mask_shape, ScalarType::Long); + + std::vector decode_pos = {(int64_t)current_seq_len}; + std::vector decode_pos_shape = {1, 1}; + auto decode_position_ids = from_blob(decode_pos.data(), decode_pos_shape, ScalarType::Long); + + std::vector decode_inputs = {token_emb, decode_attention_mask, decode_position_ids}; + for (const auto& kv_ptr : kv_cache_storage) { + decode_inputs.emplace_back(*kv_ptr); + } + + auto decode_result = decode_decoder_->forward(decode_inputs); + if (!decode_result.ok()) break; + + auto& decode_outputs = decode_result.get(); + const auto& decode_hidden = decode_outputs[0]; + + // Update KV cache + kv_cache_storage.clear(); + kv_cache_storage.reserve(decode_outputs.size() - 1); + for (size_t i = 1; i < decode_outputs.size(); i++) { + const auto& tensor = decode_outputs[i].toTensor(); + kv_cache_storage.push_back(clone_tensor_ptr(tensor)); + } + + // Sample next token + auto hidden_vec = extract_token_hidden_state(decode_hidden, 0); + logits = get_logits(hidden_vec); + next_token = sample_token(logits); + + generated_tokens.push_back(next_token); + current_seq_len++; + + if (next_token == eos_token_id) { + LOGi("EOS token at step %d", step); + break; + } + } + + LOGi("Generation complete: %zu tokens", generated_tokens.size()); + + // Decode tokens + char* decoded_text = nanovlm_decode(tokenizer_, generated_tokens.data(), generated_tokens.size()); + if (!decoded_text) { + nanovlm_free_tokenization_result(tok_result); + throw std::runtime_error("Failed to decode tokens"); + } + + std::string result(decoded_text); + nanovlm_free_string(decoded_text); + nanovlm_free_tokenization_result(tok_result); + + return result; + + } catch (const std::exception& e) { + LOGe("Generation failed: %s", e.what()); + throw; + } + } + + bool isLoaded() const { + return vision_encoder_ && modality_projector_ && prefill_decoder_ && + decode_decoder_ && token_embedding_ && lm_head_ && tokenizer_; + } +}; + +// Global instance +static std::unique_ptr g_inference; + +// JNI exports +extern "C" { + +JNIEXPORT jboolean JNICALL +Java_ai_baseweight_baseweightsnap_NanoVLM_1Android_nativeLoadModels( + JNIEnv *env, + jobject, + jstring model_dir_path, + jstring tokenizer_path) { + + const char *model_dir = env->GetStringUTFChars(model_dir_path, 0); + const char *tokenizer = env->GetStringUTFChars(tokenizer_path, 0); + + try { + g_inference = std::make_unique(); + bool success = g_inference->loadModels(model_dir, tokenizer); + + env->ReleaseStringUTFChars(model_dir_path, model_dir); + env->ReleaseStringUTFChars(tokenizer_path, tokenizer); + + return success ? JNI_TRUE : JNI_FALSE; + } catch (const std::exception& e) { + LOGe("Failed to load models: %s", e.what()); + env->ReleaseStringUTFChars(model_dir_path, model_dir); + env->ReleaseStringUTFChars(tokenizer_path, tokenizer); + return JNI_FALSE; + } +} + +JNIEXPORT jboolean JNICALL +Java_ai_baseweight_baseweightsnap_NanoVLM_1Android_nativeProcessImageFromBuffer( + JNIEnv *env, + jobject, + jobject buffer, + jint width, + jint height) { + + if (!g_inference || !g_inference->isLoaded()) { + LOGe("Models not loaded"); + return JNI_FALSE; + } + + jbyte* buff = (jbyte*)env->GetDirectBufferAddress(buffer); + if (!buff) { + LOGe("Failed to get buffer address"); + return JNI_FALSE; + } + + try { + bool success = g_inference->processImageFromBuffer((const uint8_t*)buff, width, height); + return success ? JNI_TRUE : JNI_FALSE; + } catch (const std::exception& e) { + LOGe("Image processing failed: %s", e.what()); + return JNI_FALSE; + } +} + +JNIEXPORT jstring JNICALL +Java_ai_baseweight_baseweightsnap_NanoVLM_1Android_nativeGenerateResponse( + JNIEnv *env, + jobject, + jstring prompt, + jint max_tokens) { + + if (!g_inference || !g_inference->isLoaded()) { + LOGe("Models not loaded"); + return env->NewStringUTF(""); + } + + const char* c_prompt = env->GetStringUTFChars(prompt, 0); + + try { + std::string result = g_inference->generateResponse(c_prompt, max_tokens); + env->ReleaseStringUTFChars(prompt, c_prompt); + return env->NewStringUTF(result.c_str()); + } catch (const std::exception& e) { + LOGe("Generation failed: %s", e.what()); + env->ReleaseStringUTFChars(prompt, c_prompt); + return env->NewStringUTF(""); + } +} + +JNIEXPORT void JNICALL +Java_ai_baseweight_baseweightsnap_NanoVLM_1Android_nativeFreeModels( + JNIEnv *, + jobject) { + g_inference.reset(); + LOGi("Models freed"); +} + +} // extern "C" diff --git a/app/src/main/cpp/nanovlm_preprocessor.h b/app/src/main/cpp/nanovlm_preprocessor.h new file mode 100644 index 0000000..345dc3d --- /dev/null +++ b/app/src/main/cpp/nanovlm_preprocessor.h @@ -0,0 +1,102 @@ +#ifndef NANOVLM_PREPROCESSOR_H +#define NANOVLM_PREPROCESSOR_H + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +// Opaque handle to tokenizer +typedef struct TokenizerHandle TokenizerHandle; + +// Tokenization result structure +typedef struct { + int64_t* token_ids; + size_t num_tokens; + size_t* image_token_positions; + size_t num_image_tokens; +} TokenizationResult; + +// Image data structure +typedef struct { + float* data; + size_t width; + size_t height; + size_t channels; +} ImageData; + +// Multiple images with grid info +typedef struct { + ImageData* images; + size_t num_images; + size_t grid_h; + size_t grid_w; +} MultiImageData; + +// Load a tokenizer from JSON file +// Returns NULL on failure +TokenizerHandle* nanovlm_load_tokenizer( + const char* tokenizer_path, + const char* image_token +); + +// Free tokenizer handle +void nanovlm_free_tokenizer(TokenizerHandle* handle); + +// Tokenize text with image token placeholders +// image_token_length: how many times to repeat the image token +// Caller must free result with nanovlm_free_tokenization_result +TokenizationResult nanovlm_tokenize( + TokenizerHandle* handle, + const char* text, + size_t image_token_length +); + +// Free tokenization result +void nanovlm_free_tokenization_result(TokenizationResult result); + +// Preprocess image to CHW format normalized to [0, 1] +// Returns image data in CHW layout (channels, height, width) +// Caller must free result with nanovlm_free_image_data +ImageData nanovlm_preprocess_image( + const char* image_path, + size_t target_size +); + +// Preprocess image with splitting (global + patches) +// max_side_len: max dimension (e.g., 2048) +// patch_size: size of each patch (e.g., 512) +// resize_to_max: if true, resize to exactly max_side_len; if false, don't upscale +// Returns multiple images: [global_view, patch_0_0, patch_0_1, ...] +// Caller must free result with nanovlm_free_multi_image_data +MultiImageData nanovlm_preprocess_image_with_splitting( + const char* image_path, + size_t max_side_len, + size_t patch_size, + int resize_to_max +); + +// Free image data +void nanovlm_free_image_data(ImageData image_data); + +// Free multiple image data +void nanovlm_free_multi_image_data(MultiImageData multi_image_data); + +// Decode token IDs back to text +// Returns newly allocated C string that must be freed with nanovlm_free_string +char* nanovlm_decode( + TokenizerHandle* handle, + const int64_t* token_ids, + size_t num_tokens +); + +// Free string returned by nanovlm_decode +void nanovlm_free_string(char* str); + +#ifdef __cplusplus +} +#endif + +#endif // NANOVLM_PREPROCESSOR_H diff --git a/app/src/main/cpp/stb_image.h b/app/src/main/cpp/stb_image.h new file mode 100644 index 0000000..9eedabe --- /dev/null +++ b/app/src/main/cpp/stb_image.h @@ -0,0 +1,7988 @@ +/* stb_image - v2.30 - public domain image loader - http://nothings.org/stb + no warranty implied; use at your own risk + + Do this: + #define STB_IMAGE_IMPLEMENTATION + before you include this file in *one* C or C++ file to create the implementation. + + // i.e. it should look like this: + #include ... + #include ... + #include ... + #define STB_IMAGE_IMPLEMENTATION + #include "stb_image.h" + + You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. + And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free + + + QUICK NOTES: + Primarily of interest to game developers and other people who can + avoid problematic images and only need the trivial interface + + JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) + PNG 1/2/4/8/16-bit-per-channel + + TGA (not sure what subset, if a subset) + BMP non-1bpp, non-RLE + PSD (composited view only, no extra channels, 8/16 bit-per-channel) + + GIF (*comp always reports as 4-channel) + HDR (radiance rgbE format) + PIC (Softimage PIC) + PNM (PPM and PGM binary only) + + Animated GIF still needs a proper API, but here's one way to do it: + http://gist.github.com/urraka/685d9a6340b26b830d49 + + - decode from memory or through FILE (define STBI_NO_STDIO to remove code) + - decode from arbitrary I/O callbacks + - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) + + Full documentation under "DOCUMENTATION" below. + + +LICENSE + + See end of file for license information. + +RECENT REVISION HISTORY: + + 2.30 (2024-05-31) avoid erroneous gcc warning + 2.29 (2023-05-xx) optimizations + 2.28 (2023-01-29) many error fixes, security errors, just tons of stuff + 2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes + 2.26 (2020-07-13) many minor fixes + 2.25 (2020-02-02) fix warnings + 2.24 (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically + 2.23 (2019-08-11) fix clang static analysis warning + 2.22 (2019-03-04) gif fixes, fix warnings + 2.21 (2019-02-25) fix typo in comment + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings + 2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes + 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 + RGB-format JPEG; remove white matting in PSD; + allocate large structures on the stack; + correct channel count for PNG & BMP + 2.10 (2016-01-22) avoid warning introduced in 2.09 + 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED + + See end of file for full revision history. + + + ============================ Contributors ========================= + + Image formats Extensions, features + Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) + Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) + Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) + Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) + Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) + Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) + Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) + github:urraka (animated gif) Junggon Kim (PNM comments) + Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA) + socks-the-fox (16-bit PNG) + Jeremy Sawicki (handle all ImageNet JPGs) + Optimizations & bugfixes Mikhail Morozov (1-bit BMP) + Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query) + Arseny Kapoulkine Simon Breuss (16-bit PNM) + John-Mark Allen + Carmelo J Fdez-Aguera + + Bug & warning fixes + Marc LeBlanc David Woo Guillaume George Martins Mozeiko + Christpher Lloyd Jerry Jansson Joseph Thomson Blazej Dariusz Roszkowski + Phil Jordan Dave Moore Roy Eltham + Hayaki Saito Nathan Reed Won Chun + Luke Graham Johan Duparc Nick Verigakis the Horde3D community + Thomas Ruf Ronny Chevalier github:rlyeh + Janez Zemva John Bartholomew Michal Cichon github:romigrou + Jonathan Blow Ken Hamada Tero Hanninen github:svdijk + Eugene Golushkov Laurent Gomila Cort Stratton github:snagar + Aruelien Pocheville Sergio Gonzalez Thibault Reuille github:Zelex + Cass Everitt Ryamond Barbiero github:grim210 + Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw + Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus + Josh Tobin Neil Bickford Matthew Gregan github:poppolopoppo + Julian Raschke Gregory Mullen Christian Floisand github:darealshinji + Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007 + Brad Weinberger Matvey Cherevko github:mosra + Luca Sas Alexander Veselov Zack Middleton [reserved] + Ryan C. Gordon [reserved] [reserved] + DO NOT ADD YOUR NAME HERE + + Jacko Dirks + + To add your name to the credits, pick a random blank space in the middle and fill it. + 80% of merge conflicts on stb PRs are due to people adding their name at the end + of the credits. +*/ + +#ifndef STBI_INCLUDE_STB_IMAGE_H +#define STBI_INCLUDE_STB_IMAGE_H + +// DOCUMENTATION +// +// Limitations: +// - no 12-bit-per-channel JPEG +// - no JPEGs with arithmetic coding +// - GIF always returns *comp=4 +// +// Basic usage (see HDR discussion below for HDR usage): +// int x,y,n; +// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); +// // ... process data if not NULL ... +// // ... x = width, y = height, n = # 8-bit components per pixel ... +// // ... replace '0' with '1'..'4' to force that many components per pixel +// // ... but 'n' will always be the number that it would have been if you said 0 +// stbi_image_free(data); +// +// Standard parameters: +// int *x -- outputs image width in pixels +// int *y -- outputs image height in pixels +// int *channels_in_file -- outputs # of image components in image file +// int desired_channels -- if non-zero, # of image components requested in result +// +// The return value from an image loader is an 'unsigned char *' which points +// to the pixel data, or NULL on an allocation failure or if the image is +// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, +// with each pixel consisting of N interleaved 8-bit components; the first +// pixel pointed to is top-left-most in the image. There is no padding between +// image scanlines or between pixels, regardless of format. The number of +// components N is 'desired_channels' if desired_channels is non-zero, or +// *channels_in_file otherwise. If desired_channels is non-zero, +// *channels_in_file has the number of components that _would_ have been +// output otherwise. E.g. if you set desired_channels to 4, you will always +// get RGBA output, but you can check *channels_in_file to see if it's trivially +// opaque because e.g. there were only 3 channels in the source image. +// +// An output image with N components has the following components interleaved +// in this order in each pixel: +// +// N=#comp components +// 1 grey +// 2 grey, alpha +// 3 red, green, blue +// 4 red, green, blue, alpha +// +// If image loading fails for any reason, the return value will be NULL, +// and *x, *y, *channels_in_file will be unchanged. The function +// stbi_failure_reason() can be queried for an extremely brief, end-user +// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS +// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly +// more user-friendly ones. +// +// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. +// +// To query the width, height and component count of an image without having to +// decode the full file, you can use the stbi_info family of functions: +// +// int x,y,n,ok; +// ok = stbi_info(filename, &x, &y, &n); +// // returns ok=1 and sets x, y, n if image is a supported format, +// // 0 otherwise. +// +// Note that stb_image pervasively uses ints in its public API for sizes, +// including sizes of memory buffers. This is now part of the API and thus +// hard to change without causing breakage. As a result, the various image +// loaders all have certain limits on image size; these differ somewhat +// by format but generally boil down to either just under 2GB or just under +// 1GB. When the decoded image would be larger than this, stb_image decoding +// will fail. +// +// Additionally, stb_image will reject image files that have any of their +// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS, +// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit, +// the only way to have an image with such dimensions load correctly +// is for it to have a rather extreme aspect ratio. Either way, the +// assumption here is that such larger images are likely to be malformed +// or malicious. If you do need to load an image with individual dimensions +// larger than that, and it still fits in the overall size limit, you can +// #define STBI_MAX_DIMENSIONS on your own to be something larger. +// +// =========================================================================== +// +// UNICODE: +// +// If compiling for Windows and you wish to use Unicode filenames, compile +// with +// #define STBI_WINDOWS_UTF8 +// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert +// Windows wchar_t filenames to utf8. +// +// =========================================================================== +// +// Philosophy +// +// stb libraries are designed with the following priorities: +// +// 1. easy to use +// 2. easy to maintain +// 3. good performance +// +// Sometimes I let "good performance" creep up in priority over "easy to maintain", +// and for best performance I may provide less-easy-to-use APIs that give higher +// performance, in addition to the easy-to-use ones. Nevertheless, it's important +// to keep in mind that from the standpoint of you, a client of this library, +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. +// +// Some secondary priorities arise directly from the first two, some of which +// provide more explicit reasons why performance can't be emphasized. +// +// - Portable ("ease of use") +// - Small source code footprint ("easy to maintain") +// - No dependencies ("ease of use") +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). +// +// =========================================================================== +// +// SIMD support +// +// The JPEG decoder will try to automatically use SIMD kernels on x86 when +// supported by the compiler. For ARM Neon support, you must explicitly +// request it. +// +// (The old do-it-yourself SIMD API is no longer supported in the current +// code.) +// +// On x86, SSE2 will automatically be used when available based on a run-time +// test; if not, the generic C versions are used as a fall-back. On ARM targets, +// the typical path is to have separate builds for NEON and non-NEON devices +// (at least this is true for iOS and Android). Therefore, the NEON support is +// toggled by a build flag: define STBI_NEON to get NEON loops. +// +// If for some reason you do not want to use any of SIMD code, or if +// you have issues compiling it, you can disable it entirely by +// defining STBI_NO_SIMD. +// +// =========================================================================== +// +// HDR image support (disable by defining STBI_NO_HDR) +// +// stb_image supports loading HDR images in general, and currently the Radiance +// .HDR file format specifically. You can still load any file through the existing +// interface; if you attempt to load an HDR file, it will be automatically remapped +// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; +// both of these constants can be reconfigured through this interface: +// +// stbi_hdr_to_ldr_gamma(2.2f); +// stbi_hdr_to_ldr_scale(1.0f); +// +// (note, do not use _inverse_ constants; stbi_image will invert them +// appropriately). +// +// Additionally, there is a new, parallel interface for loading files as +// (linear) floats to preserve the full dynamic range: +// +// float *data = stbi_loadf(filename, &x, &y, &n, 0); +// +// If you load LDR images through this interface, those images will +// be promoted to floating point values, run through the inverse of +// constants corresponding to the above: +// +// stbi_ldr_to_hdr_scale(1.0f); +// stbi_ldr_to_hdr_gamma(2.2f); +// +// Finally, given a filename (or an open file or memory block--see header +// file for details) containing image data, you can query for the "most +// appropriate" interface to use (that is, whether the image is HDR or +// not), using: +// +// stbi_is_hdr(char *filename); +// +// =========================================================================== +// +// iPhone PNG support: +// +// We optionally support converting iPhone-formatted PNGs (which store +// premultiplied BGRA) back to RGB, even though they're internally encoded +// differently. To enable this conversion, call +// stbi_convert_iphone_png_to_rgb(1). +// +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per +// pixel to remove any premultiplied alpha *only* if the image file explicitly +// says there's premultiplied data (currently only happens in iPhone images, +// and only if iPhone convert-to-rgb processing is on). +// +// =========================================================================== +// +// ADDITIONAL CONFIGURATION +// +// - You can suppress implementation of any of the decoders to reduce +// your code footprint by #defining one or more of the following +// symbols before creating the implementation. +// +// STBI_NO_JPEG +// STBI_NO_PNG +// STBI_NO_BMP +// STBI_NO_PSD +// STBI_NO_TGA +// STBI_NO_GIF +// STBI_NO_HDR +// STBI_NO_PIC +// STBI_NO_PNM (.ppm and .pgm) +// +// - You can request *only* certain decoders and suppress all other ones +// (this will be more forward-compatible, as addition of new decoders +// doesn't require you to disable them explicitly): +// +// STBI_ONLY_JPEG +// STBI_ONLY_PNG +// STBI_ONLY_BMP +// STBI_ONLY_PSD +// STBI_ONLY_TGA +// STBI_ONLY_GIF +// STBI_ONLY_HDR +// STBI_ONLY_PIC +// STBI_ONLY_PNM (.ppm and .pgm) +// +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB +// +// - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater +// than that size (in either width or height) without further processing. +// This is to let programs in the wild set an upper bound to prevent +// denial-of-service attacks on untrusted data, as one could generate a +// valid image of gigantic dimensions and force stb_image to allocate a +// huge block of memory and spend disproportionate time decoding it. By +// default this is set to (1 << 24), which is 16777216, but that's still +// very big. + +#ifndef STBI_NO_STDIO +#include +#endif // STBI_NO_STDIO + +#define STBI_VERSION 1 + +enum +{ + STBI_default = 0, // only used for desired_channels + + STBI_grey = 1, + STBI_grey_alpha = 2, + STBI_rgb = 3, + STBI_rgb_alpha = 4 +}; + +#include +typedef unsigned char stbi_uc; +typedef unsigned short stbi_us; + +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef STBIDEF +#ifdef STB_IMAGE_STATIC +#define STBIDEF static +#else +#define STBIDEF extern +#endif +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// PRIMARY API - works on images of any type +// + +// +// load image by filename, open file, or memory buffer +// + +typedef struct +{ + int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read + void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative + int (*eof) (void *user); // returns nonzero if we are at end of file/data +} stbi_io_callbacks; + +//////////////////////////////////// +// +// 8-bits-per-channel interface +// + +STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels); + +#ifndef STBI_NO_STDIO +STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); +// for stbi_load_from_file, file pointer is left pointing immediately after image +#endif + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp); +#endif + +#ifdef STBI_WINDOWS_UTF8 +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); +#endif + +//////////////////////////////////// +// +// 16-bits-per-channel interface +// + +STBIDEF stbi_us *stbi_load_16_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); + +#ifndef STBI_NO_STDIO +STBIDEF stbi_us *stbi_load_16 (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); +#endif + +//////////////////////////////////// +// +// float-per-channel interface +// +#ifndef STBI_NO_LINEAR + STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); + + #ifndef STBI_NO_STDIO + STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); + #endif +#endif + +#ifndef STBI_NO_HDR + STBIDEF void stbi_hdr_to_ldr_gamma(float gamma); + STBIDEF void stbi_hdr_to_ldr_scale(float scale); +#endif // STBI_NO_HDR + +#ifndef STBI_NO_LINEAR + STBIDEF void stbi_ldr_to_hdr_gamma(float gamma); + STBIDEF void stbi_ldr_to_hdr_scale(float scale); +#endif // STBI_NO_LINEAR + +// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename); +STBIDEF int stbi_is_hdr_from_file(FILE *f); +#endif // STBI_NO_STDIO + + +// get a VERY brief reason for failure +// on most compilers (and ALL modern mainstream compilers) this is threadsafe +STBIDEF const char *stbi_failure_reason (void); + +// free the loaded image -- this is just free() +STBIDEF void stbi_image_free (void *retval_from_stbi_load); + +// get image dimensions & components without fully decoding +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len); +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user); + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit (char const *filename); +STBIDEF int stbi_is_16_bit_from_file(FILE *f); +#endif + + + +// for image formats that explicitly notate that they have premultiplied alpha, +// we just return the colors as stored in the file. set this flag to force +// unpremultiplication. results are undefined if the unpremultiply overflow. +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); + +// indicate whether we should process iphone images back to canonical format, +// or just pass them through "as-is" +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); + +// flip the image vertically, so the first pixel in the output array is the bottom left +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); + +// as above, but only applies to images loaded on the thread that calls the function +// this function is only available if your compiler supports thread-local variables; +// calling it will fail to link if your compiler doesn't +STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply); +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert); +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip); + +// ZLIB client - used by PNG, available for other purposes + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); +STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + +STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + + +#ifdef __cplusplus +} +#endif + +// +// +//// end header file ///////////////////////////////////////////////////// +#endif // STBI_INCLUDE_STB_IMAGE_H + +#ifdef STB_IMAGE_IMPLEMENTATION + +#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ + || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ + || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ + || defined(STBI_ONLY_ZLIB) + #ifndef STBI_ONLY_JPEG + #define STBI_NO_JPEG + #endif + #ifndef STBI_ONLY_PNG + #define STBI_NO_PNG + #endif + #ifndef STBI_ONLY_BMP + #define STBI_NO_BMP + #endif + #ifndef STBI_ONLY_PSD + #define STBI_NO_PSD + #endif + #ifndef STBI_ONLY_TGA + #define STBI_NO_TGA + #endif + #ifndef STBI_ONLY_GIF + #define STBI_NO_GIF + #endif + #ifndef STBI_ONLY_HDR + #define STBI_NO_HDR + #endif + #ifndef STBI_ONLY_PIC + #define STBI_NO_PIC + #endif + #ifndef STBI_ONLY_PNM + #define STBI_NO_PNM + #endif +#endif + +#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) +#define STBI_NO_ZLIB +#endif + + +#include +#include // ptrdiff_t on osx +#include +#include +#include + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) +#include // ldexp, pow +#endif + +#ifndef STBI_NO_STDIO +#include +#endif + +#ifndef STBI_ASSERT +#include +#define STBI_ASSERT(x) assert(x) +#endif + +#ifdef __cplusplus +#define STBI_EXTERN extern "C" +#else +#define STBI_EXTERN extern +#endif + + +#ifndef _MSC_VER + #ifdef __cplusplus + #define stbi_inline inline + #else + #define stbi_inline + #endif +#else + #define stbi_inline __forceinline +#endif + +#ifndef STBI_NO_THREAD_LOCALS + #if defined(__cplusplus) && __cplusplus >= 201103L + #define STBI_THREAD_LOCAL thread_local + #elif defined(__GNUC__) && __GNUC__ < 5 + #define STBI_THREAD_LOCAL __thread + #elif defined(_MSC_VER) + #define STBI_THREAD_LOCAL __declspec(thread) + #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__) + #define STBI_THREAD_LOCAL _Thread_local + #endif + + #ifndef STBI_THREAD_LOCAL + #if defined(__GNUC__) + #define STBI_THREAD_LOCAL __thread + #endif + #endif +#endif + +#if defined(_MSC_VER) || defined(__SYMBIAN32__) +typedef unsigned short stbi__uint16; +typedef signed short stbi__int16; +typedef unsigned int stbi__uint32; +typedef signed int stbi__int32; +#else +#include +typedef uint16_t stbi__uint16; +typedef int16_t stbi__int16; +typedef uint32_t stbi__uint32; +typedef int32_t stbi__int32; +#endif + +// should produce compiler error if size is wrong +typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1]; + +#ifdef _MSC_VER +#define STBI_NOTUSED(v) (void)(v) +#else +#define STBI_NOTUSED(v) (void)sizeof(v) +#endif + +#ifdef _MSC_VER +#define STBI_HAS_LROTL +#endif + +#ifdef STBI_HAS_LROTL + #define stbi_lrot(x,y) _lrotl(x,y) +#else + #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (-(y) & 31))) +#endif + +#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) +// ok +#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." +#endif + +#ifndef STBI_MALLOC +#define STBI_MALLOC(sz) malloc(sz) +#define STBI_REALLOC(p,newsz) realloc(p,newsz) +#define STBI_FREE(p) free(p) +#endif + +#ifndef STBI_REALLOC_SIZED +#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) +#endif + +// x86/x64 detection +#if defined(__x86_64__) || defined(_M_X64) +#define STBI__X64_TARGET +#elif defined(__i386) || defined(_M_IX86) +#define STBI__X86_TARGET +#endif + +#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, +// but previous attempts to provide the SSE2 functions with runtime +// detection caused numerous issues. The way architecture extensions are +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. +// New behavior: if compiled with -msse2, we use SSE2 without any +// detection; if not, we don't use it at all. +#define STBI_NO_SIMD +#endif + +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET +// +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not +// simultaneously enabling "-mstackrealign". +// +// See https://github.com/nothings/stb/issues/81 for more information. +// +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. +#define STBI_NO_SIMD +#endif + +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) +#define STBI_SSE2 +#include + +#ifdef _MSC_VER + +#if _MSC_VER >= 1400 // not VC6 +#include // __cpuid +static int stbi__cpuid3(void) +{ + int info[4]; + __cpuid(info,1); + return info[3]; +} +#else +static int stbi__cpuid3(void) +{ + int res; + __asm { + mov eax,1 + cpuid + mov res,edx + } + return res; +} +#endif + +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available(void) +{ + int info3 = stbi__cpuid3(); + return ((info3 >> 26) & 1) != 0; +} +#endif + +#else // assume GCC-style if not VC++ +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available(void) +{ + // If we're even attempting to compile this on GCC/Clang, that means + // -msse2 is on, which means the compiler is allowed to use SSE2 + // instructions at will, and so are we. + return 1; +} +#endif + +#endif +#endif + +// ARM NEON +#if defined(STBI_NO_SIMD) && defined(STBI_NEON) +#undef STBI_NEON +#endif + +#ifdef STBI_NEON +#include +#ifdef _MSC_VER +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name +#else +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) +#endif +#endif + +#ifndef STBI_SIMD_ALIGN +#define STBI_SIMD_ALIGN(type, name) type name +#endif + +#ifndef STBI_MAX_DIMENSIONS +#define STBI_MAX_DIMENSIONS (1 << 24) +#endif + +/////////////////////////////////////////////// +// +// stbi__context struct and start_xxx functions + +// stbi__context structure is our basic context used by all images, so it +// contains all the IO context, plus some basic image information +typedef struct +{ + stbi__uint32 img_x, img_y; + int img_n, img_out_n; + + stbi_io_callbacks io; + void *io_user_data; + + int read_from_callbacks; + int buflen; + stbi_uc buffer_start[128]; + int callback_already_read; + + stbi_uc *img_buffer, *img_buffer_end; + stbi_uc *img_buffer_original, *img_buffer_original_end; +} stbi__context; + + +static void stbi__refill_buffer(stbi__context *s); + +// initialize a memory-decode context +static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) +{ + s->io.read = NULL; + s->read_from_callbacks = 0; + s->callback_already_read = 0; + s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer; + s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len; +} + +// initialize a callback-based context +static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) +{ + s->io = *c; + s->io_user_data = user; + s->buflen = sizeof(s->buffer_start); + s->read_from_callbacks = 1; + s->callback_already_read = 0; + s->img_buffer = s->img_buffer_original = s->buffer_start; + stbi__refill_buffer(s); + s->img_buffer_original_end = s->img_buffer_end; +} + +#ifndef STBI_NO_STDIO + +static int stbi__stdio_read(void *user, char *data, int size) +{ + return (int) fread(data,1,size,(FILE*) user); +} + +static void stbi__stdio_skip(void *user, int n) +{ + int ch; + fseek((FILE*) user, n, SEEK_CUR); + ch = fgetc((FILE*) user); /* have to read a byte to reset feof()'s flag */ + if (ch != EOF) { + ungetc(ch, (FILE *) user); /* push byte back onto stream if valid. */ + } +} + +static int stbi__stdio_eof(void *user) +{ + return feof((FILE*) user) || ferror((FILE *) user); +} + +static stbi_io_callbacks stbi__stdio_callbacks = +{ + stbi__stdio_read, + stbi__stdio_skip, + stbi__stdio_eof, +}; + +static void stbi__start_file(stbi__context *s, FILE *f) +{ + stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); +} + +//static void stop_file(stbi__context *s) { } + +#endif // !STBI_NO_STDIO + +static void stbi__rewind(stbi__context *s) +{ + // conceptually rewind SHOULD rewind to the beginning of the stream, + // but we just rewind to the beginning of the initial buffer, because + // we only use it after doing 'test', which only ever looks at at most 92 bytes + s->img_buffer = s->img_buffer_original; + s->img_buffer_end = s->img_buffer_original_end; +} + +enum +{ + STBI_ORDER_RGB, + STBI_ORDER_BGR +}; + +typedef struct +{ + int bits_per_channel; + int num_channels; + int channel_order; +} stbi__result_info; + +#ifndef STBI_NO_JPEG +static int stbi__jpeg_test(stbi__context *s); +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNG +static int stbi__png_test(stbi__context *s); +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__png_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_BMP +static int stbi__bmp_test(stbi__context *s); +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_TGA +static int stbi__tga_test(stbi__context *s); +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s); +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc); +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__psd_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_HDR +static int stbi__hdr_test(stbi__context *s); +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_test(stbi__context *s); +static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_GIF +static int stbi__gif_test(stbi__context *s); +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp); +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNM +static int stbi__pnm_test(stbi__context *s); +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__pnm_is16(stbi__context *s); +#endif + +static +#ifdef STBI_THREAD_LOCAL +STBI_THREAD_LOCAL +#endif +const char *stbi__g_failure_reason; + +STBIDEF const char *stbi_failure_reason(void) +{ + return stbi__g_failure_reason; +} + +#ifndef STBI_NO_FAILURE_STRINGS +static int stbi__err(const char *str) +{ + stbi__g_failure_reason = str; + return 0; +} +#endif + +static void *stbi__malloc(size_t size) +{ + return STBI_MALLOC(size); +} + +// stb_image uses ints pervasively, including for offset calculations. +// therefore the largest decoded image size we can support with the +// current code, even on 64-bit targets, is INT_MAX. this is not a +// significant limitation for the intended use case. +// +// we do, however, need to make sure our size calculations don't +// overflow. hence a few helper functions for size calculations that +// multiply integers together, making sure that they're non-negative +// and no overflow occurs. + +// return 1 if the sum is valid, 0 on overflow. +// negative terms are considered invalid. +static int stbi__addsizes_valid(int a, int b) +{ + if (b < 0) return 0; + // now 0 <= b <= INT_MAX, hence also + // 0 <= INT_MAX - b <= INTMAX. + // And "a + b <= INT_MAX" (which might overflow) is the + // same as a <= INT_MAX - b (no overflow) + return a <= INT_MAX - b; +} + +// returns 1 if the product is valid, 0 on overflow. +// negative factors are considered invalid. +static int stbi__mul2sizes_valid(int a, int b) +{ + if (a < 0 || b < 0) return 0; + if (b == 0) return 1; // mul-by-0 is always safe + // portable way to check for no overflows in a*b + return a <= INT_MAX/b; +} + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow +static int stbi__mad2sizes_valid(int a, int b, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add); +} +#endif + +// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow +static int stbi__mad3sizes_valid(int a, int b, int c, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__addsizes_valid(a*b*c, add); +} + +// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add); +} +#endif + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// mallocs with size overflow checking +static void *stbi__malloc_mad2(int a, int b, int add) +{ + if (!stbi__mad2sizes_valid(a, b, add)) return NULL; + return stbi__malloc(a*b + add); +} +#endif + +static void *stbi__malloc_mad3(int a, int b, int c, int add) +{ + if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL; + return stbi__malloc(a*b*c + add); +} + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) +{ + if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; + return stbi__malloc(a*b*c*d + add); +} +#endif + +// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1 inclusive), 0 on overflow. +static int stbi__addints_valid(int a, int b) +{ + if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow + if (a < 0 && b < 0) return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot overflow since b < 0. + return a <= INT_MAX - b; +} + +// returns 1 if the product of two ints fits in a signed short, 0 on overflow. +static int stbi__mul2shorts_valid(int a, int b) +{ + if (b == 0 || b == -1) return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b doesn't overflow + if ((a >= 0) == (b >= 0)) return a <= SHRT_MAX/b; // product is positive, so similar to mul2sizes_valid + if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN + return a >= SHRT_MIN / b; +} + +// stbi__err - error +// stbi__errpf - error returning pointer to float +// stbi__errpuc - error returning pointer to unsigned char + +#ifdef STBI_NO_FAILURE_STRINGS + #define stbi__err(x,y) 0 +#elif defined(STBI_FAILURE_USERMSG) + #define stbi__err(x,y) stbi__err(y) +#else + #define stbi__err(x,y) stbi__err(x) +#endif + +#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL)) +#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL)) + +STBIDEF void stbi_image_free(void *retval_from_stbi_load) +{ + STBI_FREE(retval_from_stbi_load); +} + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp); +#endif + +#ifndef STBI_NO_HDR +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); +#endif + +static int stbi__vertically_flip_on_load_global = 0; + +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) +{ + stbi__vertically_flip_on_load_global = flag_true_if_should_flip; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global +#else +static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set; + +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip) +{ + stbi__vertically_flip_on_load_local = flag_true_if_should_flip; + stbi__vertically_flip_on_load_set = 1; +} + +#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set \ + ? stbi__vertically_flip_on_load_local \ + : stbi__vertically_flip_on_load_global) +#endif // STBI_THREAD_LOCAL + +static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields + ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed + ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order + ri->num_channels = 0; + + // test the formats with a very explicit header first (at least a FOURCC + // or distinctive magic number first) + #ifndef STBI_NO_PNG + if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_BMP + if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_GIF + if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PSD + if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc); + #else + STBI_NOTUSED(bpc); + #endif + #ifndef STBI_NO_PIC + if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri); + #endif + + // then the formats that can end up attempting to load with just 1 or 2 + // bytes matching expectations; these are prone to false positives, so + // try them later + #ifndef STBI_NO_JPEG + if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PNM + if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri); + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri); + return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + + #ifndef STBI_NO_TGA + // test tga last because it's a crappy test! + if (stbi__tga_test(s)) + return stbi__tga_load(s,x,y,comp,req_comp, ri); + #endif + + return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); +} + +static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi_uc *reduced; + + reduced = (stbi_uc *) stbi__malloc(img_len); + if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling + + STBI_FREE(orig); + return reduced; +} + +static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi__uint16 *enlarged; + + enlarged = (stbi__uint16 *) stbi__malloc(img_len*2); + if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff + + STBI_FREE(orig); + return enlarged; +} + +static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel) +{ + int row; + size_t bytes_per_row = (size_t)w * bytes_per_pixel; + stbi_uc temp[2048]; + stbi_uc *bytes = (stbi_uc *)image; + + for (row = 0; row < (h>>1); row++) { + stbi_uc *row0 = bytes + row*bytes_per_row; + stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row; + // swap row0 with row1 + size_t bytes_left = bytes_per_row; + while (bytes_left) { + size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp); + memcpy(temp, row0, bytes_copy); + memcpy(row0, row1, bytes_copy); + memcpy(row1, temp, bytes_copy); + row0 += bytes_copy; + row1 += bytes_copy; + bytes_left -= bytes_copy; + } + } +} + +#ifndef STBI_NO_GIF +static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel) +{ + int slice; + int slice_size = w * h * bytes_per_pixel; + + stbi_uc *bytes = (stbi_uc *)image; + for (slice = 0; slice < z; ++slice) { + stbi__vertical_flip(bytes, w, h, bytes_per_pixel); + bytes += slice_size; + } +} +#endif + +static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8); + + if (result == NULL) + return NULL; + + // it is the responsibility of the loaders to make sure we get either 8 or 16 bit. + STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + + if (ri.bits_per_channel != 8) { + result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 8; + } + + // @TODO: move stbi__convert_format to here + + if (stbi__vertically_flip_on_load) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc)); + } + + return (unsigned char *) result; +} + +static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16); + + if (result == NULL) + return NULL; + + // it is the responsibility of the loaders to make sure we get either 8 or 16 bit. + STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + + if (ri.bits_per_channel != 16) { + result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 16; + } + + // @TODO: move stbi__convert_format16 to here + // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision + + if (stbi__vertically_flip_on_load) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16)); + } + + return (stbi__uint16 *) result; +} + +#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR) +static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) +{ + if (stbi__vertically_flip_on_load && result != NULL) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(float)); + } +} +#endif + +#ifndef STBI_NO_STDIO + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); +STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); +#endif + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) +{ + return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); +} +#endif + +static FILE *stbi__fopen(char const *filename, char const *mode) +{ + FILE *f; +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) + wchar_t wMode[64]; + wchar_t wFilename[1024]; + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename))) + return 0; + + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode))) + return 0; + +#if defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != _wfopen_s(&f, wFilename, wMode)) + f = 0; +#else + f = _wfopen(wFilename, wMode); +#endif + +#elif defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != fopen_s(&f, filename, mode)) + f=0; +#else + f = fopen(filename, mode); +#endif + return f; +} + + +STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + unsigned char *result; + if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__uint16 *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + stbi__uint16 *result; + if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file_16(f,x,y,comp,req_comp); + fclose(f); + return result; +} + + +#endif //!STBI_NO_STDIO + +STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user); + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ + unsigned char *result; + stbi__context s; + stbi__start_mem(&s,buffer,len); + + result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp); + if (stbi__vertically_flip_on_load) { + stbi__vertical_flip_slices( result, *x, *y, *z, *comp ); + } + + return result; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + stbi__result_info ri; + float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri); + if (hdr_data) + stbi__float_postprocess(hdr_data,x,y,comp,req_comp); + return hdr_data; + } + #endif + data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); + if (data) + return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); + return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); +} + +STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_STDIO +STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + float *result; + FILE *f = stbi__fopen(filename, "rb"); + if (!f) return stbi__errpf("can't fopen", "Unable to open file"); + result = stbi_loadf_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_file(&s,f); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_LINEAR + +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always +// reports false! + +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(buffer); + STBI_NOTUSED(len); + return 0; + #endif +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result=0; + if (f) { + result = stbi_is_hdr_from_file(f); + fclose(f); + } + return result; +} + +STBIDEF int stbi_is_hdr_from_file(FILE *f) +{ + #ifndef STBI_NO_HDR + long pos = ftell(f); + int res; + stbi__context s; + stbi__start_file(&s,f); + res = stbi__hdr_test(&s); + fseek(f, pos, SEEK_SET); + return res; + #else + STBI_NOTUSED(f); + return 0; + #endif +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(clbk); + STBI_NOTUSED(user); + return 0; + #endif +} + +#ifndef STBI_NO_LINEAR +static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; + +STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } +STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } +#endif + +static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; + +STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } +STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } + + +////////////////////////////////////////////////////////////////////////////// +// +// Common code used by all image loaders +// + +enum +{ + STBI__SCAN_load=0, + STBI__SCAN_type, + STBI__SCAN_header +}; + +static void stbi__refill_buffer(stbi__context *s) +{ + int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); + s->callback_already_read += (int) (s->img_buffer - s->img_buffer_original); + if (n == 0) { + // at end of file, treat same as if from memory, but need to handle case + // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file + s->read_from_callbacks = 0; + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start+1; + *s->img_buffer = 0; + } else { + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start + n; + } +} + +stbi_inline static stbi_uc stbi__get8(stbi__context *s) +{ + if (s->img_buffer < s->img_buffer_end) + return *s->img_buffer++; + if (s->read_from_callbacks) { + stbi__refill_buffer(s); + return *s->img_buffer++; + } + return 0; +} + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +stbi_inline static int stbi__at_eof(stbi__context *s) +{ + if (s->io.read) { + if (!(s->io.eof)(s->io_user_data)) return 0; + // if feof() is true, check if buffer = end + // special case: we've only got the special 0 character at the end + if (s->read_from_callbacks == 0) return 1; + } + + return s->img_buffer >= s->img_buffer_end; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) +// nothing +#else +static void stbi__skip(stbi__context *s, int n) +{ + if (n == 0) return; // already there! + if (n < 0) { + s->img_buffer = s->img_buffer_end; + return; + } + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + s->img_buffer = s->img_buffer_end; + (s->io.skip)(s->io_user_data, n - blen); + return; + } + } + s->img_buffer += n; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM) +// nothing +#else +static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) +{ + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + int res, count; + + memcpy(buffer, s->img_buffer, blen); + + count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); + res = (count == (n-blen)); + s->img_buffer = s->img_buffer_end; + return res; + } + } + + if (s->img_buffer+n <= s->img_buffer_end) { + memcpy(buffer, s->img_buffer, n); + s->img_buffer += n; + return 1; + } else + return 0; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static int stbi__get16be(stbi__context *s) +{ + int z = stbi__get8(s); + return (z << 8) + stbi__get8(s); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static stbi__uint32 stbi__get32be(stbi__context *s) +{ + stbi__uint32 z = stbi__get16be(s); + return (z << 16) + stbi__get16be(s); +} +#endif + +#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) +// nothing +#else +static int stbi__get16le(stbi__context *s) +{ + int z = stbi__get8(s); + return z + (stbi__get8(s) << 8); +} +#endif + +#ifndef STBI_NO_BMP +static stbi__uint32 stbi__get32le(stbi__context *s) +{ + stbi__uint32 z = stbi__get16le(s); + z += (stbi__uint32)stbi__get16le(s) << 16; + return z; +} +#endif + +#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +////////////////////////////////////////////////////////////////////////////// +// +// generic converter from built-in img_n to req_comp +// individual types do this automatically as much as possible (e.g. jpeg +// does all cases internally since it needs to colorspace convert anyway, +// and it never has alpha, so very few cases ). png can automatically +// interleave an alpha=255 channel, but falls back to this for other cases +// +// assume data buffer is malloced, so malloc a new one and free that one +// only failure mode is malloc failing + +static stbi_uc stbi__compute_y(int r, int g, int b) +{ + return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + unsigned char *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0); + if (good == NULL) { + STBI_FREE(data); + return stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + unsigned char *src = data + j * x * img_n ; + unsigned char *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; + default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return stbi__errpuc("unsupported", "Unsupported format conversion"); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 stbi__compute_y_16(int r, int g, int b) +{ + return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + stbi__uint16 *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2); + if (good == NULL) { + STBI_FREE(data); + return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + stbi__uint16 *src = data + j * x * img_n ; + stbi__uint16 *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; + default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return (stbi__uint16*) stbi__errpuc("unsupported", "Unsupported format conversion"); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) +{ + int i,k,n; + float *output; + if (!data) return NULL; + output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); + } + } + if (n < comp) { + for (i=0; i < x*y; ++i) { + output[i*comp + n] = data[i*comp + n]/255.0f; + } + } + STBI_FREE(data); + return output; +} +#endif + +#ifndef STBI_NO_HDR +#define stbi__float2int(x) ((int) (x)) +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) +{ + int i,k,n; + stbi_uc *output; + if (!data) return NULL; + output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + if (k < comp) { + float z = data[i*comp+k] * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + } + STBI_FREE(data); + return output; +} +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// "baseline" JPEG/JFIF decoder +// +// simple implementation +// - doesn't support delayed output of y-dimension +// - simple interface (only one output format: 8-bit interleaved RGB) +// - doesn't try to recover corrupt jpegs +// - doesn't allow partial loading, loading multiple at once +// - still fast on x86 (copying globals into locals doesn't help x86) +// - allocates lots of intermediate memory (full size of all components) +// - non-interleaved case requires this anyway +// - allows good upsampling (see next) +// high-quality +// - upsampled channels are bilinearly interpolated, even across blocks +// - quality integer IDCT derived from IJG's 'slow' +// performance +// - fast huffman; reasonable integer IDCT +// - some SIMD kernels for common paths on targets with SSE2/NEON +// - uses a lot of intermediate memory, could cache poorly + +#ifndef STBI_NO_JPEG + +// huffman decoding acceleration +#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache + +typedef struct +{ + stbi_uc fast[1 << FAST_BITS]; + // weirdly, repacking this into AoS is a 10% speed loss, instead of a win + stbi__uint16 code[256]; + stbi_uc values[256]; + stbi_uc size[257]; + unsigned int maxcode[18]; + int delta[17]; // old 'firstsymbol' - old 'firstcode' +} stbi__huffman; + +typedef struct +{ + stbi__context *s; + stbi__huffman huff_dc[4]; + stbi__huffman huff_ac[4]; + stbi__uint16 dequant[4][64]; + stbi__int16 fast_ac[4][1 << FAST_BITS]; + +// sizes for components, interleaved MCUs + int img_h_max, img_v_max; + int img_mcu_x, img_mcu_y; + int img_mcu_w, img_mcu_h; + +// definition of jpeg image component + struct + { + int id; + int h,v; + int tq; + int hd,ha; + int dc_pred; + + int x,y,w2,h2; + stbi_uc *data; + void *raw_data, *raw_coeff; + stbi_uc *linebuf; + short *coeff; // progressive only + int coeff_w, coeff_h; // number of 8x8 coefficient blocks + } img_comp[4]; + + stbi__uint32 code_buffer; // jpeg entropy-coded buffer + int code_bits; // number of valid bits + unsigned char marker; // marker seen while filling entropy buffer + int nomore; // flag if we saw a marker so must stop + + int progressive; + int spec_start; + int spec_end; + int succ_high; + int succ_low; + int eob_run; + int jfif; + int app14_color_transform; // Adobe APP14 tag + int rgb; + + int scan_n, order[4]; + int restart_interval, todo; + +// kernels + void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]); + void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step); + stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs); +} stbi__jpeg; + +static int stbi__build_huffman(stbi__huffman *h, int *count) +{ + int i,j,k=0; + unsigned int code; + // build size list for each symbol (from JPEG spec) + for (i=0; i < 16; ++i) { + for (j=0; j < count[i]; ++j) { + h->size[k++] = (stbi_uc) (i+1); + if(k >= 257) return stbi__err("bad size list","Corrupt JPEG"); + } + } + h->size[k] = 0; + + // compute actual symbols (from jpeg spec) + code = 0; + k = 0; + for(j=1; j <= 16; ++j) { + // compute delta to add to code to compute symbol id + h->delta[j] = k - code; + if (h->size[k] == j) { + while (h->size[k] == j) + h->code[k++] = (stbi__uint16) (code++); + if (code-1 >= (1u << j)) return stbi__err("bad code lengths","Corrupt JPEG"); + } + // compute largest code + 1 for this size, preshifted as needed later + h->maxcode[j] = code << (16-j); + code <<= 1; + } + h->maxcode[j] = 0xffffffff; + + // build non-spec acceleration table; 255 is flag for not-accelerated + memset(h->fast, 255, 1 << FAST_BITS); + for (i=0; i < k; ++i) { + int s = h->size[i]; + if (s <= FAST_BITS) { + int c = h->code[i] << (FAST_BITS-s); + int m = 1 << (FAST_BITS-s); + for (j=0; j < m; ++j) { + h->fast[c+j] = (stbi_uc) i; + } + } + } + return 1; +} + +// build a table that decodes both magnitude and value of small ACs in +// one go. +static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) +{ + int i; + for (i=0; i < (1 << FAST_BITS); ++i) { + stbi_uc fast = h->fast[i]; + fast_ac[i] = 0; + if (fast < 255) { + int rs = h->values[fast]; + int run = (rs >> 4) & 15; + int magbits = rs & 15; + int len = h->size[fast]; + + if (magbits && len + magbits <= FAST_BITS) { + // magnitude code followed by receive_extend code + int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); + int m = 1 << (magbits - 1); + if (k < m) k += (~0U << magbits) + 1; + // if the result is small enough, we can fit it in fast_ac table + if (k >= -128 && k <= 127) + fast_ac[i] = (stbi__int16) ((k * 256) + (run * 16) + (len + magbits)); + } + } + } +} + +static void stbi__grow_buffer_unsafe(stbi__jpeg *j) +{ + do { + unsigned int b = j->nomore ? 0 : stbi__get8(j->s); + if (b == 0xff) { + int c = stbi__get8(j->s); + while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes + if (c != 0) { + j->marker = (unsigned char) c; + j->nomore = 1; + return; + } + } + j->code_buffer |= b << (24 - j->code_bits); + j->code_bits += 8; + } while (j->code_bits <= 24); +} + +// (1 << n) - 1 +static const stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; + +// decode a jpeg huffman value from the bitstream +stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) +{ + unsigned int temp; + int c,k; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + // look at the top FAST_BITS and determine what symbol ID it is, + // if the code is <= FAST_BITS + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + k = h->fast[c]; + if (k < 255) { + int s = h->size[k]; + if (s > j->code_bits) + return -1; + j->code_buffer <<= s; + j->code_bits -= s; + return h->values[k]; + } + + // naive test is to shift the code_buffer down so k bits are + // valid, then test against maxcode. To speed this up, we've + // preshifted maxcode left so that it has (16-k) 0s at the + // end; in other words, regardless of the number of bits, it + // wants to be compared against something shifted to have 16; + // that way we don't need to shift inside the loop. + temp = j->code_buffer >> 16; + for (k=FAST_BITS+1 ; ; ++k) + if (temp < h->maxcode[k]) + break; + if (k == 17) { + // error! code not found + j->code_bits -= 16; + return -1; + } + + if (k > j->code_bits) + return -1; + + // convert the huffman code to the symbol id + c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; + if(c < 0 || c >= 256) // symbol id out of bounds! + return -1; + STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); + + // convert the id to a symbol + j->code_bits -= k; + j->code_buffer <<= k; + return h->values[c]; +} + +// bias[n] = (-1<code_bits < n) stbi__grow_buffer_unsafe(j); + if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing + + sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative) + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k + (stbi__jbias[n] & (sgn - 1)); +} + +// get some unsigned bits +stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) +{ + unsigned int k; + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); + if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k; +} + +stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) +{ + unsigned int k; + if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); + if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing + k = j->code_buffer; + j->code_buffer <<= 1; + --j->code_bits; + return k & 0x80000000; +} + +// given a value that's at position X in the zigzag stream, +// where does it appear in the 8x8 matrix coded as row-major? +static const stbi_uc stbi__jpeg_dezigzag[64+15] = +{ + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63, + // let corrupt input sample past end + 63, 63, 63, 63, 63, 63, 63, 63, + 63, 63, 63, 63, 63, 63, 63 +}; + +// decode one 64-entry block-- +static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant) +{ + int diff,dc,k; + int t; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + t = stbi__jpeg_huff_decode(j, hdc); + if (t < 0 || t > 15) return stbi__err("bad huffman code","Corrupt JPEG"); + + // 0 all the ac values now so we can do it 32-bits at a time + memset(data,0,64*sizeof(data[0])); + + diff = t ? stbi__extend_receive(j, t) : 0; + if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG"); + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + data[0] = (short) (dc * dequant[0]); + + // decode AC components, see JPEG spec + k = 1; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available"); + j->code_buffer <<= s; + j->code_bits -= s; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) * dequant[zig]); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (rs != 0xf0) break; // end block + k += 16; + } else { + k += r; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); + } + } + } while (k < 64); + return 1; +} + +static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) +{ + int diff,dc; + int t; + if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + if (j->succ_high == 0) { + // first scan for DC coefficient, must be first + memset(data,0,64*sizeof(data[0])); // 0 all the ac values now + t = stbi__jpeg_huff_decode(j, hdc); + if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + diff = t ? stbi__extend_receive(j, t) : 0; + + if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG"); + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + data[0] = (short) (dc * (1 << j->succ_low)); + } else { + // refinement scan for DC coefficient + if (stbi__jpeg_get_bit(j)) + data[0] += (short) (1 << j->succ_low); + } + return 1; +} + +// @OPTIMIZE: store non-zigzagged during the decode passes, +// and only de-zigzag when dequantizing +static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) +{ + int k; + if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->succ_high == 0) { + int shift = j->succ_low; + + if (j->eob_run) { + --j->eob_run; + return 1; + } + + k = j->spec_start; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available"); + j->code_buffer <<= s; + j->code_bits -= s; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) * (1 << shift)); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r); + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + --j->eob_run; + break; + } + k += 16; + } else { + k += r; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) * (1 << shift)); + } + } + } while (k <= j->spec_end); + } else { + // refinement scan for these AC coefficients + + short bit = (short) (1 << j->succ_low); + + if (j->eob_run) { + --j->eob_run; + for (k = j->spec_start; k <= j->spec_end; ++k) { + short *p = &data[stbi__jpeg_dezigzag[k]]; + if (*p != 0) + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } + } else { + k = j->spec_start; + do { + int r,s; + int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r) - 1; + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + r = 64; // force end of block + } else { + // r=15 s=0 should write 16 0s, so we just do + // a run of 15 0s and then write s (which is 0), + // so we don't have to do anything special here + } + } else { + if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); + // sign bit + if (stbi__jpeg_get_bit(j)) + s = bit; + else + s = -bit; + } + + // advance by r + while (k <= j->spec_end) { + short *p = &data[stbi__jpeg_dezigzag[k++]]; + if (*p != 0) { + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } else { + if (r == 0) { + *p = (short) s; + break; + } + --r; + } + } + } while (k <= j->spec_end); + } + } + return 1; +} + +// take a -128..127 value and stbi__clamp it and convert to 0..255 +stbi_inline static stbi_uc stbi__clamp(int x) +{ + // trick to use a single test to catch both cases + if ((unsigned int) x > 255) { + if (x < 0) return 0; + if (x > 255) return 255; + } + return (stbi_uc) x; +} + +#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) +#define stbi__fsh(x) ((x) * 4096) + +// derived from jidctint -- DCT_ISLOW +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ + int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ + p2 = s2; \ + p3 = s6; \ + p1 = (p2+p3) * stbi__f2f(0.5411961f); \ + t2 = p1 + p3*stbi__f2f(-1.847759065f); \ + t3 = p1 + p2*stbi__f2f( 0.765366865f); \ + p2 = s0; \ + p3 = s4; \ + t0 = stbi__fsh(p2+p3); \ + t1 = stbi__fsh(p2-p3); \ + x0 = t0+t3; \ + x3 = t0-t3; \ + x1 = t1+t2; \ + x2 = t1-t2; \ + t0 = s7; \ + t1 = s5; \ + t2 = s3; \ + t3 = s1; \ + p3 = t0+t2; \ + p4 = t1+t3; \ + p1 = t0+t3; \ + p2 = t1+t2; \ + p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ + t0 = t0*stbi__f2f( 0.298631336f); \ + t1 = t1*stbi__f2f( 2.053119869f); \ + t2 = t2*stbi__f2f( 3.072711026f); \ + t3 = t3*stbi__f2f( 1.501321110f); \ + p1 = p5 + p1*stbi__f2f(-0.899976223f); \ + p2 = p5 + p2*stbi__f2f(-2.562915447f); \ + p3 = p3*stbi__f2f(-1.961570560f); \ + p4 = p4*stbi__f2f(-0.390180644f); \ + t3 += p1+p4; \ + t2 += p2+p3; \ + t1 += p2+p4; \ + t0 += p1+p3; + +static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) +{ + int i,val[64],*v=val; + stbi_uc *o; + short *d = data; + + // columns + for (i=0; i < 8; ++i,++d, ++v) { + // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing + if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 + && d[40]==0 && d[48]==0 && d[56]==0) { + // no shortcut 0 seconds + // (1|2|3|4|5|6|7)==0 0 seconds + // all separate -0.047 seconds + // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds + int dcterm = d[0]*4; + v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; + } else { + STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) + // constants scaled things up by 1<<12; let's bring them back + // down, but keep 2 extra bits of precision + x0 += 512; x1 += 512; x2 += 512; x3 += 512; + v[ 0] = (x0+t3) >> 10; + v[56] = (x0-t3) >> 10; + v[ 8] = (x1+t2) >> 10; + v[48] = (x1-t2) >> 10; + v[16] = (x2+t1) >> 10; + v[40] = (x2-t1) >> 10; + v[24] = (x3+t0) >> 10; + v[32] = (x3-t0) >> 10; + } + } + + for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { + // no fast case since the first 1D IDCT spread components out + STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) + // constants scaled things up by 1<<12, plus we had 1<<2 from first + // loop, plus horizontal and vertical each scale by sqrt(8) so together + // we've got an extra 1<<3, so 1<<17 total we need to remove. + // so we want to round that, which means adding 0.5 * 1<<17, + // aka 65536. Also, we'll end up with -128 to 127 that we want + // to encode as 0..255 by adding 128, so we'll add that before the shift + x0 += 65536 + (128<<17); + x1 += 65536 + (128<<17); + x2 += 65536 + (128<<17); + x3 += 65536 + (128<<17); + // tried computing the shifts into temps, or'ing the temps to see + // if any were out of range, but that was slower + o[0] = stbi__clamp((x0+t3) >> 17); + o[7] = stbi__clamp((x0-t3) >> 17); + o[1] = stbi__clamp((x1+t2) >> 17); + o[6] = stbi__clamp((x1-t2) >> 17); + o[2] = stbi__clamp((x2+t1) >> 17); + o[5] = stbi__clamp((x2-t1) >> 17); + o[3] = stbi__clamp((x3+t0) >> 17); + o[4] = stbi__clamp((x3-t0) >> 17); + } +} + +#ifdef STBI_SSE2 +// sse2 integer IDCT. not the fastest possible implementation but it +// produces bit-identical results to the generic C version so it's +// fully "transparent". +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + // This is constructed to match our regular (generic) integer IDCT exactly. + __m128i row0, row1, row2, row3, row4, row5, row6, row7; + __m128i tmp; + + // dot product constant: even elems=x, odd elems=y + #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) + + // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) + // out(1) = c1[even]*x + c1[odd]*y + #define dct_rot(out0,out1, x,y,c0,c1) \ + __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ + __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ + __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ + __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ + __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ + __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) + + // out = in << 12 (in 16-bit, out 32-bit) + #define dct_widen(out, in) \ + __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ + __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) + + // wide add + #define dct_wadd(out, a, b) \ + __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_add_epi32(a##_h, b##_h) + + // wide sub + #define dct_wsub(out, a, b) \ + __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) + + // butterfly a/b, add bias, then shift by "s" and pack + #define dct_bfly32o(out0, out1, a,b,bias,s) \ + { \ + __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ + __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ + dct_wadd(sum, abiased, b); \ + dct_wsub(dif, abiased, b); \ + out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ + out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ + } + + // 8-bit interleave step (for transposes) + #define dct_interleave8(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi8(a, b); \ + b = _mm_unpackhi_epi8(tmp, b) + + // 16-bit interleave step (for transposes) + #define dct_interleave16(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi16(a, b); \ + b = _mm_unpackhi_epi16(tmp, b) + + #define dct_pass(bias,shift) \ + { \ + /* even part */ \ + dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ + __m128i sum04 = _mm_add_epi16(row0, row4); \ + __m128i dif04 = _mm_sub_epi16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ + dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ + __m128i sum17 = _mm_add_epi16(row1, row7); \ + __m128i sum35 = _mm_add_epi16(row3, row5); \ + dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ + dct_wadd(x4, y0o, y4o); \ + dct_wadd(x5, y1o, y5o); \ + dct_wadd(x6, y2o, y5o); \ + dct_wadd(x7, y3o, y4o); \ + dct_bfly32o(row0,row7, x0,x7,bias,shift); \ + dct_bfly32o(row1,row6, x1,x6,bias,shift); \ + dct_bfly32o(row2,row5, x2,x5,bias,shift); \ + dct_bfly32o(row3,row4, x3,x4,bias,shift); \ + } + + __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); + __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); + __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); + __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); + __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); + __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); + __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); + __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); + + // rounding biases in column/row passes, see stbi__idct_block for explanation. + __m128i bias_0 = _mm_set1_epi32(512); + __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); + + // load + row0 = _mm_load_si128((const __m128i *) (data + 0*8)); + row1 = _mm_load_si128((const __m128i *) (data + 1*8)); + row2 = _mm_load_si128((const __m128i *) (data + 2*8)); + row3 = _mm_load_si128((const __m128i *) (data + 3*8)); + row4 = _mm_load_si128((const __m128i *) (data + 4*8)); + row5 = _mm_load_si128((const __m128i *) (data + 5*8)); + row6 = _mm_load_si128((const __m128i *) (data + 6*8)); + row7 = _mm_load_si128((const __m128i *) (data + 7*8)); + + // column pass + dct_pass(bias_0, 10); + + { + // 16bit 8x8 transpose pass 1 + dct_interleave16(row0, row4); + dct_interleave16(row1, row5); + dct_interleave16(row2, row6); + dct_interleave16(row3, row7); + + // transpose pass 2 + dct_interleave16(row0, row2); + dct_interleave16(row1, row3); + dct_interleave16(row4, row6); + dct_interleave16(row5, row7); + + // transpose pass 3 + dct_interleave16(row0, row1); + dct_interleave16(row2, row3); + dct_interleave16(row4, row5); + dct_interleave16(row6, row7); + } + + // row pass + dct_pass(bias_1, 17); + + { + // pack + __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 + __m128i p1 = _mm_packus_epi16(row2, row3); + __m128i p2 = _mm_packus_epi16(row4, row5); + __m128i p3 = _mm_packus_epi16(row6, row7); + + // 8bit 8x8 transpose pass 1 + dct_interleave8(p0, p2); // a0e0a1e1... + dct_interleave8(p1, p3); // c0g0c1g1... + + // transpose pass 2 + dct_interleave8(p0, p1); // a0c0e0g0... + dct_interleave8(p2, p3); // b0d0f0h0... + + // transpose pass 3 + dct_interleave8(p0, p2); // a0b0c0d0... + dct_interleave8(p1, p3); // a4b4c4d4... + + // store + _mm_storel_epi64((__m128i *) out, p0); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p2); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p1); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p3); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); + } + +#undef dct_const +#undef dct_rot +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_interleave8 +#undef dct_interleave16 +#undef dct_pass +} + +#endif // STBI_SSE2 + +#ifdef STBI_NEON + +// NEON integer IDCT. should produce bit-identical +// results to the generic C version. +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; + + int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); + int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); + int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); + int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); + int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); + int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); + int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); + int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); + int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); + int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); + int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); + int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); + +#define dct_long_mul(out, inq, coeff) \ + int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) + +#define dct_long_mac(out, acc, inq, coeff) \ + int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) + +#define dct_widen(out, inq) \ + int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ + int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) + +// wide add +#define dct_wadd(out, a, b) \ + int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vaddq_s32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ + int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vsubq_s32(a##_h, b##_h) + +// butterfly a/b, then shift using "shiftop" by "s" and pack +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ + { \ + dct_wadd(sum, a, b); \ + dct_wsub(dif, a, b); \ + out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ + out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ + } + +#define dct_pass(shiftop, shift) \ + { \ + /* even part */ \ + int16x8_t sum26 = vaddq_s16(row2, row6); \ + dct_long_mul(p1e, sum26, rot0_0); \ + dct_long_mac(t2e, p1e, row6, rot0_1); \ + dct_long_mac(t3e, p1e, row2, rot0_2); \ + int16x8_t sum04 = vaddq_s16(row0, row4); \ + int16x8_t dif04 = vsubq_s16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + int16x8_t sum15 = vaddq_s16(row1, row5); \ + int16x8_t sum17 = vaddq_s16(row1, row7); \ + int16x8_t sum35 = vaddq_s16(row3, row5); \ + int16x8_t sum37 = vaddq_s16(row3, row7); \ + int16x8_t sumodd = vaddq_s16(sum17, sum35); \ + dct_long_mul(p5o, sumodd, rot1_0); \ + dct_long_mac(p1o, p5o, sum17, rot1_1); \ + dct_long_mac(p2o, p5o, sum35, rot1_2); \ + dct_long_mul(p3o, sum37, rot2_0); \ + dct_long_mul(p4o, sum15, rot2_1); \ + dct_wadd(sump13o, p1o, p3o); \ + dct_wadd(sump24o, p2o, p4o); \ + dct_wadd(sump23o, p2o, p3o); \ + dct_wadd(sump14o, p1o, p4o); \ + dct_long_mac(x4, sump13o, row7, rot3_0); \ + dct_long_mac(x5, sump24o, row5, rot3_1); \ + dct_long_mac(x6, sump23o, row3, rot3_2); \ + dct_long_mac(x7, sump14o, row1, rot3_3); \ + dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ + dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ + dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ + dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ + } + + // load + row0 = vld1q_s16(data + 0*8); + row1 = vld1q_s16(data + 1*8); + row2 = vld1q_s16(data + 2*8); + row3 = vld1q_s16(data + 3*8); + row4 = vld1q_s16(data + 4*8); + row5 = vld1q_s16(data + 5*8); + row6 = vld1q_s16(data + 6*8); + row7 = vld1q_s16(data + 7*8); + + // add DC bias + row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); + + // column pass + dct_pass(vrshrn_n_s32, 10); + + // 16bit 8x8 transpose + { +// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. +// whether compilers actually get this is another story, sadly. +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } + + // pass 1 + dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 + dct_trn16(row2, row3); + dct_trn16(row4, row5); + dct_trn16(row6, row7); + + // pass 2 + dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 + dct_trn32(row1, row3); + dct_trn32(row4, row6); + dct_trn32(row5, row7); + + // pass 3 + dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 + dct_trn64(row1, row5); + dct_trn64(row2, row6); + dct_trn64(row3, row7); + +#undef dct_trn16 +#undef dct_trn32 +#undef dct_trn64 + } + + // row pass + // vrshrn_n_s32 only supports shifts up to 16, we need + // 17. so do a non-rounding shift of 16 first then follow + // up with a rounding shift by 1. + dct_pass(vshrn_n_s32, 16); + + { + // pack and round + uint8x8_t p0 = vqrshrun_n_s16(row0, 1); + uint8x8_t p1 = vqrshrun_n_s16(row1, 1); + uint8x8_t p2 = vqrshrun_n_s16(row2, 1); + uint8x8_t p3 = vqrshrun_n_s16(row3, 1); + uint8x8_t p4 = vqrshrun_n_s16(row4, 1); + uint8x8_t p5 = vqrshrun_n_s16(row5, 1); + uint8x8_t p6 = vqrshrun_n_s16(row6, 1); + uint8x8_t p7 = vqrshrun_n_s16(row7, 1); + + // again, these can translate into one instruction, but often don't. +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } + + // sadly can't use interleaved stores here since we only write + // 8 bytes to each scan line! + + // 8x8 8-bit transpose pass 1 + dct_trn8_8(p0, p1); + dct_trn8_8(p2, p3); + dct_trn8_8(p4, p5); + dct_trn8_8(p6, p7); + + // pass 2 + dct_trn8_16(p0, p2); + dct_trn8_16(p1, p3); + dct_trn8_16(p4, p6); + dct_trn8_16(p5, p7); + + // pass 3 + dct_trn8_32(p0, p4); + dct_trn8_32(p1, p5); + dct_trn8_32(p2, p6); + dct_trn8_32(p3, p7); + + // store + vst1_u8(out, p0); out += out_stride; + vst1_u8(out, p1); out += out_stride; + vst1_u8(out, p2); out += out_stride; + vst1_u8(out, p3); out += out_stride; + vst1_u8(out, p4); out += out_stride; + vst1_u8(out, p5); out += out_stride; + vst1_u8(out, p6); out += out_stride; + vst1_u8(out, p7); + +#undef dct_trn8_8 +#undef dct_trn8_16 +#undef dct_trn8_32 + } + +#undef dct_long_mul +#undef dct_long_mac +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_pass +} + +#endif // STBI_NEON + +#define STBI__MARKER_none 0xff +// if there's a pending marker from the entropy stream, return that +// otherwise, fetch from the stream and get a marker. if there's no +// marker, return 0xff, which is never a valid marker value +static stbi_uc stbi__get_marker(stbi__jpeg *j) +{ + stbi_uc x; + if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } + x = stbi__get8(j->s); + if (x != 0xff) return STBI__MARKER_none; + while (x == 0xff) + x = stbi__get8(j->s); // consume repeated 0xff fill bytes + return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, stbi__jpeg_reset the entropy decoder and +// the dc prediction +static void stbi__jpeg_reset(stbi__jpeg *j) +{ + j->code_bits = 0; + j->code_buffer = 0; + j->nomore = 0; + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; + j->marker = STBI__MARKER_none; + j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; + j->eob_run = 0; + // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, + // since we don't even allow 1<<30 pixels +} + +static int stbi__parse_entropy_coded_data(stbi__jpeg *z) +{ + stbi__jpeg_reset(z); + if (!z->progressive) { + if (z->scan_n == 1) { + int i,j; + STBI_SIMD_ALIGN(short, data[64]); + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + STBI_SIMD_ALIGN(short, data[64]); + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x)*8; + int y2 = (j*z->img_comp[n].v + y)*8; + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } else { + if (z->scan_n == 1) { + int i,j; + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + if (z->spec_start == 0) { + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } else { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) + return 0; + } + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x); + int y2 = (j*z->img_comp[n].v + y); + short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } +} + +static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) +{ + int i; + for (i=0; i < 64; ++i) + data[i] *= dequant[i]; +} + +static void stbi__jpeg_finish(stbi__jpeg *z) +{ + if (z->progressive) { + // dequantize and idct the data + int i,j,n; + for (n=0; n < z->s->img_n; ++n) { + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + } + } + } + } +} + +static int stbi__process_marker(stbi__jpeg *z, int m) +{ + int L; + switch (m) { + case STBI__MARKER_none: // no marker found + return stbi__err("expected marker","Corrupt JPEG"); + + case 0xDD: // DRI - specify restart interval + if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); + z->restart_interval = stbi__get16be(z->s); + return 1; + + case 0xDB: // DQT - define quantization table + L = stbi__get16be(z->s)-2; + while (L > 0) { + int q = stbi__get8(z->s); + int p = q >> 4, sixteen = (p != 0); + int t = q & 15,i; + if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG"); + if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); + + for (i=0; i < 64; ++i) + z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s)); + L -= (sixteen ? 129 : 65); + } + return L==0; + + case 0xC4: // DHT - define huffman table + L = stbi__get16be(z->s)-2; + while (L > 0) { + stbi_uc *v; + int sizes[16],i,n=0; + int q = stbi__get8(z->s); + int tc = q >> 4; + int th = q & 15; + if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); + for (i=0; i < 16; ++i) { + sizes[i] = stbi__get8(z->s); + n += sizes[i]; + } + if(n > 256) return stbi__err("bad DHT header","Corrupt JPEG"); // Loop over i < n would write past end of values! + L -= 17; + if (tc == 0) { + if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; + v = z->huff_dc[th].values; + } else { + if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; + v = z->huff_ac[th].values; + } + for (i=0; i < n; ++i) + v[i] = stbi__get8(z->s); + if (tc != 0) + stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); + L -= n; + } + return L==0; + } + + // check for comment block or APP blocks + if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { + L = stbi__get16be(z->s); + if (L < 2) { + if (m == 0xFE) + return stbi__err("bad COM len","Corrupt JPEG"); + else + return stbi__err("bad APP len","Corrupt JPEG"); + } + L -= 2; + + if (m == 0xE0 && L >= 5) { // JFIF APP0 segment + static const unsigned char tag[5] = {'J','F','I','F','\0'}; + int ok = 1; + int i; + for (i=0; i < 5; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 5; + if (ok) + z->jfif = 1; + } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment + static const unsigned char tag[6] = {'A','d','o','b','e','\0'}; + int ok = 1; + int i; + for (i=0; i < 6; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 6; + if (ok) { + stbi__get8(z->s); // version + stbi__get16be(z->s); // flags0 + stbi__get16be(z->s); // flags1 + z->app14_color_transform = stbi__get8(z->s); // color transform + L -= 6; + } + } + + stbi__skip(z->s, L); + return 1; + } + + return stbi__err("unknown marker","Corrupt JPEG"); +} + +// after we see SOS +static int stbi__process_scan_header(stbi__jpeg *z) +{ + int i; + int Ls = stbi__get16be(z->s); + z->scan_n = stbi__get8(z->s); + if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); + if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); + for (i=0; i < z->scan_n; ++i) { + int id = stbi__get8(z->s), which; + int q = stbi__get8(z->s); + for (which = 0; which < z->s->img_n; ++which) + if (z->img_comp[which].id == id) + break; + if (which == z->s->img_n) return 0; // no match + z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); + z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); + z->order[i] = which; + } + + { + int aa; + z->spec_start = stbi__get8(z->s); + z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 + aa = stbi__get8(z->s); + z->succ_high = (aa >> 4); + z->succ_low = (aa & 15); + if (z->progressive) { + if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) + return stbi__err("bad SOS", "Corrupt JPEG"); + } else { + if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); + if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); + z->spec_end = 63; + } + } + + return 1; +} + +static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) +{ + int i; + for (i=0; i < ncomp; ++i) { + if (z->img_comp[i].raw_data) { + STBI_FREE(z->img_comp[i].raw_data); + z->img_comp[i].raw_data = NULL; + z->img_comp[i].data = NULL; + } + if (z->img_comp[i].raw_coeff) { + STBI_FREE(z->img_comp[i].raw_coeff); + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].coeff = 0; + } + if (z->img_comp[i].linebuf) { + STBI_FREE(z->img_comp[i].linebuf); + z->img_comp[i].linebuf = NULL; + } + } + return why; +} + +static int stbi__process_frame_header(stbi__jpeg *z, int scan) +{ + stbi__context *s = z->s; + int Lf,p,i,q, h_max=1,v_max=1,c; + Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG + p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline + s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG + s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + c = stbi__get8(s); + if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG"); + s->img_n = c; + for (i=0; i < c; ++i) { + z->img_comp[i].data = NULL; + z->img_comp[i].linebuf = NULL; + } + + if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); + + z->rgb = 0; + for (i=0; i < s->img_n; ++i) { + static const unsigned char rgb[3] = { 'R', 'G', 'B' }; + z->img_comp[i].id = stbi__get8(s); + if (s->img_n == 3 && z->img_comp[i].id == rgb[i]) + ++z->rgb; + q = stbi__get8(s); + z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); + z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); + z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); + } + + if (scan != STBI__SCAN_load) return 1; + + if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode"); + + for (i=0; i < s->img_n; ++i) { + if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; + if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; + } + + // check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios + // and I've never seen a non-corrupted JPEG file actually use them + for (i=0; i < s->img_n; ++i) { + if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG"); + if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG"); + } + + // compute interleaved mcu info + z->img_h_max = h_max; + z->img_v_max = v_max; + z->img_mcu_w = h_max * 8; + z->img_mcu_h = v_max * 8; + // these sizes can't be more than 17 bits + z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; + z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; + + for (i=0; i < s->img_n; ++i) { + // number of effective pixels (e.g. for non-interleaved MCU) + z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; + z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; + // to simplify generation, we'll allocate enough memory to decode + // the bogus oversized data from using interleaved MCUs and their + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't + // discard the extra data until colorspace conversion + // + // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) + // so these muls can't overflow with 32-bit ints (which we require) + z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; + z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; + z->img_comp[i].coeff = 0; + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].linebuf = NULL; + z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); + if (z->img_comp[i].raw_data == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + // align blocks for idct using mmx/sse + z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); + if (z->progressive) { + // w2, h2 are multiples of 8 (see above) + z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; + z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; + z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); + if (z->img_comp[i].raw_coeff == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); + } + } + + return 1; +} + +// use comparisons since in some cases we handle more than one case (e.g. SOF) +#define stbi__DNL(x) ((x) == 0xdc) +#define stbi__SOI(x) ((x) == 0xd8) +#define stbi__EOI(x) ((x) == 0xd9) +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) +#define stbi__SOS(x) ((x) == 0xda) + +#define stbi__SOF_progressive(x) ((x) == 0xc2) + +static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) +{ + int m; + z->jfif = 0; + z->app14_color_transform = -1; // valid values are 0,1,2 + z->marker = STBI__MARKER_none; // initialize cached marker to empty + m = stbi__get_marker(z); + if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); + if (scan == STBI__SCAN_type) return 1; + m = stbi__get_marker(z); + while (!stbi__SOF(m)) { + if (!stbi__process_marker(z,m)) return 0; + m = stbi__get_marker(z); + while (m == STBI__MARKER_none) { + // some files have extra padding after their blocks, so ok, we'll scan + if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); + m = stbi__get_marker(z); + } + } + z->progressive = stbi__SOF_progressive(m); + if (!stbi__process_frame_header(z, scan)) return 0; + return 1; +} + +static stbi_uc stbi__skip_jpeg_junk_at_end(stbi__jpeg *j) +{ + // some JPEGs have junk at end, skip over it but if we find what looks + // like a valid marker, resume there + while (!stbi__at_eof(j->s)) { + stbi_uc x = stbi__get8(j->s); + while (x == 0xff) { // might be a marker + if (stbi__at_eof(j->s)) return STBI__MARKER_none; + x = stbi__get8(j->s); + if (x != 0x00 && x != 0xff) { + // not a stuffed zero or lead-in to another marker, looks + // like an actual marker, return it + return x; + } + // stuffed zero has x=0 now which ends the loop, meaning we go + // back to regular scan loop. + // repeated 0xff keeps trying to read the next byte of the marker. + } + } + return STBI__MARKER_none; +} + +// decode image to YCbCr format +static int stbi__decode_jpeg_image(stbi__jpeg *j) +{ + int m; + for (m = 0; m < 4; m++) { + j->img_comp[m].raw_data = NULL; + j->img_comp[m].raw_coeff = NULL; + } + j->restart_interval = 0; + if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; + m = stbi__get_marker(j); + while (!stbi__EOI(m)) { + if (stbi__SOS(m)) { + if (!stbi__process_scan_header(j)) return 0; + if (!stbi__parse_entropy_coded_data(j)) return 0; + if (j->marker == STBI__MARKER_none ) { + j->marker = stbi__skip_jpeg_junk_at_end(j); + // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 + } + m = stbi__get_marker(j); + if (STBI__RESTART(m)) + m = stbi__get_marker(j); + } else if (stbi__DNL(m)) { + int Ld = stbi__get16be(j->s); + stbi__uint32 NL = stbi__get16be(j->s); + if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG"); + if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG"); + m = stbi__get_marker(j); + } else { + if (!stbi__process_marker(j, m)) return 1; + m = stbi__get_marker(j); + } + } + if (j->progressive) + stbi__jpeg_finish(j); + return 1; +} + +// static jfif-centered resampling (across block boundaries) + +typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, + int w, int hs); + +#define stbi__div4(x) ((stbi_uc) ((x) >> 2)) + +static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + STBI_NOTUSED(out); + STBI_NOTUSED(in_far); + STBI_NOTUSED(w); + STBI_NOTUSED(hs); + return in_near; +} + +static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples vertically for every one in input + int i; + STBI_NOTUSED(hs); + for (i=0; i < w; ++i) + out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); + return out; +} + +static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples horizontally for every one in input + int i; + stbi_uc *input = in_near; + + if (w == 1) { + // if only one sample, can't do any interpolation + out[0] = out[1] = input[0]; + return out; + } + + out[0] = input[0]; + out[1] = stbi__div4(input[0]*3 + input[1] + 2); + for (i=1; i < w-1; ++i) { + int n = 3*input[i]+2; + out[i*2+0] = stbi__div4(n+input[i-1]); + out[i*2+1] = stbi__div4(n+input[i+1]); + } + out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); + out[i*2+1] = input[w-1]; + + STBI_NOTUSED(in_far); + STBI_NOTUSED(hs); + + return out; +} + +#define stbi__div16(x) ((stbi_uc) ((x) >> 4)) + +static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i,t0,t1; + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + out[0] = stbi__div4(t1+2); + for (i=1; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i=0,t0,t1; + + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + // process groups of 8 pixels for as long as we can. + // note we can't handle the last pixel in a row in this loop + // because we need to handle the filter boundary conditions. + for (; i < ((w-1) & ~7); i += 8) { +#if defined(STBI_SSE2) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + __m128i zero = _mm_setzero_si128(); + __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); + __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); + __m128i farw = _mm_unpacklo_epi8(farb, zero); + __m128i nearw = _mm_unpacklo_epi8(nearb, zero); + __m128i diff = _mm_sub_epi16(farw, nearw); + __m128i nears = _mm_slli_epi16(nearw, 2); + __m128i curr = _mm_add_epi16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + __m128i prv0 = _mm_slli_si128(curr, 2); + __m128i nxt0 = _mm_srli_si128(curr, 2); + __m128i prev = _mm_insert_epi16(prv0, t1, 0); + __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + __m128i bias = _mm_set1_epi16(8); + __m128i curs = _mm_slli_epi16(curr, 2); + __m128i prvd = _mm_sub_epi16(prev, curr); + __m128i nxtd = _mm_sub_epi16(next, curr); + __m128i curb = _mm_add_epi16(curs, bias); + __m128i even = _mm_add_epi16(prvd, curb); + __m128i odd = _mm_add_epi16(nxtd, curb); + + // interleave even and odd pixels, then undo scaling. + __m128i int0 = _mm_unpacklo_epi16(even, odd); + __m128i int1 = _mm_unpackhi_epi16(even, odd); + __m128i de0 = _mm_srli_epi16(int0, 4); + __m128i de1 = _mm_srli_epi16(int1, 4); + + // pack and write output + __m128i outv = _mm_packus_epi16(de0, de1); + _mm_storeu_si128((__m128i *) (out + i*2), outv); +#elif defined(STBI_NEON) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + uint8x8_t farb = vld1_u8(in_far + i); + uint8x8_t nearb = vld1_u8(in_near + i); + int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); + int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); + int16x8_t curr = vaddq_s16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + int16x8_t prv0 = vextq_s16(curr, curr, 7); + int16x8_t nxt0 = vextq_s16(curr, curr, 1); + int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); + int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + int16x8_t curs = vshlq_n_s16(curr, 2); + int16x8_t prvd = vsubq_s16(prev, curr); + int16x8_t nxtd = vsubq_s16(next, curr); + int16x8_t even = vaddq_s16(curs, prvd); + int16x8_t odd = vaddq_s16(curs, nxtd); + + // undo scaling and round, then store with even/odd phases interleaved + uint8x8x2_t o; + o.val[0] = vqrshrun_n_s16(even, 4); + o.val[1] = vqrshrun_n_s16(odd, 4); + vst2_u8(out + i*2, o); +#endif + + // "previous" value for next iter + t1 = 3*in_near[i+7] + in_far[i+7]; + } + + t0 = t1; + t1 = 3*in_near[i] + in_far[i]; + out[i*2] = stbi__div16(3*t1 + t0 + 8); + + for (++i; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} +#endif + +static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // resample with nearest-neighbor + int i,j; + STBI_NOTUSED(in_far); + for (i=0; i < w; ++i) + for (j=0; j < hs; ++j) + out[i*hs+j] = in_near[i]; + return out; +} + +// this is a reduced-precision calculation of YCbCr-to-RGB introduced +// to make sure the code produces the same results in both SIMD and scalar +#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) +static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) +{ + int i; + for (i=0; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) +{ + int i = 0; + +#ifdef STBI_SSE2 + // step == 3 is pretty ugly on the final interleave, and i'm not convinced + // it's useful in practice (you wouldn't use it for textures, for example). + // so just accelerate step == 4 case. + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + __m128i signflip = _mm_set1_epi8(-0x80); + __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); + __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); + __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); + __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); + __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); + __m128i xw = _mm_set1_epi16(255); // alpha channel + + for (; i+7 < count; i += 8) { + // load + __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); + __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); + __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); + __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 + __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 + + // unpack to short (and left-shift cr, cb by 8) + __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); + __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); + __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); + + // color transform + __m128i yws = _mm_srli_epi16(yw, 4); + __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); + __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); + __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); + __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); + __m128i rws = _mm_add_epi16(cr0, yws); + __m128i gwt = _mm_add_epi16(cb0, yws); + __m128i bws = _mm_add_epi16(yws, cb1); + __m128i gws = _mm_add_epi16(gwt, cr1); + + // descale + __m128i rw = _mm_srai_epi16(rws, 4); + __m128i bw = _mm_srai_epi16(bws, 4); + __m128i gw = _mm_srai_epi16(gws, 4); + + // back to byte, set up for transpose + __m128i brb = _mm_packus_epi16(rw, bw); + __m128i gxb = _mm_packus_epi16(gw, xw); + + // transpose to interleave channels + __m128i t0 = _mm_unpacklo_epi8(brb, gxb); + __m128i t1 = _mm_unpackhi_epi8(brb, gxb); + __m128i o0 = _mm_unpacklo_epi16(t0, t1); + __m128i o1 = _mm_unpackhi_epi16(t0, t1); + + // store + _mm_storeu_si128((__m128i *) (out + 0), o0); + _mm_storeu_si128((__m128i *) (out + 16), o1); + out += 32; + } + } +#endif + +#ifdef STBI_NEON + // in this version, step=3 support would be easy to add. but is there demand? + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + uint8x8_t signflip = vdup_n_u8(0x80); + int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); + int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); + int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); + int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); + + for (; i+7 < count; i += 8) { + // load + uint8x8_t y_bytes = vld1_u8(y + i); + uint8x8_t cr_bytes = vld1_u8(pcr + i); + uint8x8_t cb_bytes = vld1_u8(pcb + i); + int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); + int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); + + // expand to s16 + int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); + int16x8_t crw = vshll_n_s8(cr_biased, 7); + int16x8_t cbw = vshll_n_s8(cb_biased, 7); + + // color transform + int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); + int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); + int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); + int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); + int16x8_t rws = vaddq_s16(yws, cr0); + int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); + int16x8_t bws = vaddq_s16(yws, cb1); + + // undo scaling, round, convert to byte + uint8x8x4_t o; + o.val[0] = vqrshrun_n_s16(rws, 4); + o.val[1] = vqrshrun_n_s16(gws, 4); + o.val[2] = vqrshrun_n_s16(bws, 4); + o.val[3] = vdup_n_u8(255); + + // store, interleaving r/g/b/a + vst4_u8(out, o); + out += 8*4; + } + } +#endif + + for (; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#endif + +// set up the kernels +static void stbi__setup_jpeg(stbi__jpeg *j) +{ + j->idct_block_kernel = stbi__idct_block; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; + +#ifdef STBI_SSE2 + if (stbi__sse2_available()) { + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; + } +#endif + +#ifdef STBI_NEON + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; +#endif +} + +// clean up the temporary component buffers +static void stbi__cleanup_jpeg(stbi__jpeg *j) +{ + stbi__free_jpeg_components(j, j->s->img_n, 0); +} + +typedef struct +{ + resample_row_func resample; + stbi_uc *line0,*line1; + int hs,vs; // expansion factor in each axis + int w_lores; // horizontal pixels pre-expansion + int ystep; // how far through vertical expansion we are + int ypos; // which pre-expansion row we're on +} stbi__resample; + +// fast 0..255 * 0..255 => 0..255 rounded multiplication +static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) +{ + unsigned int t = x*y + 128; + return (stbi_uc) ((t + (t >>8)) >> 8); +} + +static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) +{ + int n, decode_n, is_rgb; + z->s->img_n = 0; // make stbi__cleanup_jpeg safe + + // validate req_comp + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + + // load a jpeg image from whichever source, but leave in YCbCr format + if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } + + // determine actual number of components to generate + n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1; + + is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif)); + + if (z->s->img_n == 3 && n < 3 && !is_rgb) + decode_n = 1; + else + decode_n = z->s->img_n; + + // nothing to do if no components requested; check this now to avoid + // accessing uninitialized coutput[0] later + if (decode_n <= 0) { stbi__cleanup_jpeg(z); return NULL; } + + // resample and color-convert + { + int k; + unsigned int i,j; + stbi_uc *output; + stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL }; + + stbi__resample res_comp[4]; + + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + + // allocate line buffer big enough for upsampling off the edges + // with upsample factor of 4 + z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); + if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + r->hs = z->img_h_max / z->img_comp[k].h; + r->vs = z->img_v_max / z->img_comp[k].v; + r->ystep = r->vs >> 1; + r->w_lores = (z->s->img_x + r->hs-1) / r->hs; + r->ypos = 0; + r->line0 = r->line1 = z->img_comp[k].data; + + if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; + else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; + else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; + else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; + else r->resample = stbi__resample_row_generic; + } + + // can't error after this so, this is safe + output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); + if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + // now go ahead and resample + for (j=0; j < z->s->img_y; ++j) { + stbi_uc *out = output + n * z->s->img_x * j; + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + int y_bot = r->ystep >= (r->vs >> 1); + coutput[k] = r->resample(z->img_comp[k].linebuf, + y_bot ? r->line1 : r->line0, + y_bot ? r->line0 : r->line1, + r->w_lores, r->hs); + if (++r->ystep >= r->vs) { + r->ystep = 0; + r->line0 = r->line1; + if (++r->ypos < z->img_comp[k].y) + r->line1 += z->img_comp[k].w2; + } + } + if (n >= 3) { + stbi_uc *y = coutput[0]; + if (z->s->img_n == 3) { + if (is_rgb) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = y[i]; + out[1] = coutput[1][i]; + out[2] = coutput[2][i]; + out[3] = 255; + out += n; + } + } else { + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } + } else if (z->s->img_n == 4) { + if (z->app14_color_transform == 0) { // CMYK + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8(coutput[0][i], m); + out[1] = stbi__blinn_8x8(coutput[1][i], m); + out[2] = stbi__blinn_8x8(coutput[2][i], m); + out[3] = 255; + out += n; + } + } else if (z->app14_color_transform == 2) { // YCCK + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8(255 - out[0], m); + out[1] = stbi__blinn_8x8(255 - out[1], m); + out[2] = stbi__blinn_8x8(255 - out[2], m); + out += n; + } + } else { // YCbCr + alpha? Ignore the fourth channel for now + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } + } else + for (i=0; i < z->s->img_x; ++i) { + out[0] = out[1] = out[2] = y[i]; + out[3] = 255; // not used if n==3 + out += n; + } + } else { + if (is_rgb) { + if (n == 1) + for (i=0; i < z->s->img_x; ++i) + *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + else { + for (i=0; i < z->s->img_x; ++i, out += 2) { + out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + out[1] = 255; + } + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 0) { + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + stbi_uc r = stbi__blinn_8x8(coutput[0][i], m); + stbi_uc g = stbi__blinn_8x8(coutput[1][i], m); + stbi_uc b = stbi__blinn_8x8(coutput[2][i], m); + out[0] = stbi__compute_y(r, g, b); + out[1] = 255; + out += n; + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 2) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]); + out[1] = 255; + out += n; + } + } else { + stbi_uc *y = coutput[0]; + if (n == 1) + for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; + else + for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; } + } + } + } + stbi__cleanup_jpeg(z); + *out_x = z->s->img_x; + *out_y = z->s->img_y; + if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output + return output; + } +} + +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + unsigned char* result; + stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); + if (!j) return stbi__errpuc("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + STBI_NOTUSED(ri); + j->s = s; + stbi__setup_jpeg(j); + result = load_jpeg_image(j, x,y,comp,req_comp); + STBI_FREE(j); + return result; +} + +static int stbi__jpeg_test(stbi__context *s) +{ + int r; + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); + if (!j) return stbi__err("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + j->s = s; + stbi__setup_jpeg(j); + r = stbi__decode_jpeg_header(j, STBI__SCAN_type); + stbi__rewind(s); + STBI_FREE(j); + return r; +} + +static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) +{ + if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { + stbi__rewind( j->s ); + return 0; + } + if (x) *x = j->s->img_x; + if (y) *y = j->s->img_y; + if (comp) *comp = j->s->img_n >= 3 ? 3 : 1; + return 1; +} + +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) +{ + int result; + stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); + if (!j) return stbi__err("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + j->s = s; + result = stbi__jpeg_info_raw(j, x, y, comp); + STBI_FREE(j); + return result; +} +#endif + +// public domain zlib decode v0.2 Sean Barrett 2006-11-18 +// simple implementation +// - all input must be provided in an upfront buffer +// - all output is written to a single output buffer (can malloc/realloc) +// performance +// - fast huffman + +#ifndef STBI_NO_ZLIB + +// fast-way is faster to check than jpeg huffman, but slow way is slower +#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables +#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) +#define STBI__ZNSYMS 288 // number of symbols in literal/length alphabet + +// zlib-style huffman encoding +// (jpegs packs from left, zlib from right, so can't share code) +typedef struct +{ + stbi__uint16 fast[1 << STBI__ZFAST_BITS]; + stbi__uint16 firstcode[16]; + int maxcode[17]; + stbi__uint16 firstsymbol[16]; + stbi_uc size[STBI__ZNSYMS]; + stbi__uint16 value[STBI__ZNSYMS]; +} stbi__zhuffman; + +stbi_inline static int stbi__bitreverse16(int n) +{ + n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); + n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); + n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); + n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); + return n; +} + +stbi_inline static int stbi__bit_reverse(int v, int bits) +{ + STBI_ASSERT(bits <= 16); + // to bit reverse n bits, reverse 16 and shift + // e.g. 11 bits, bit reverse and shift away 5 + return stbi__bitreverse16(v) >> (16-bits); +} + +static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) +{ + int i,k=0; + int code, next_code[16], sizes[17]; + + // DEFLATE spec for generating codes + memset(sizes, 0, sizeof(sizes)); + memset(z->fast, 0, sizeof(z->fast)); + for (i=0; i < num; ++i) + ++sizes[sizelist[i]]; + sizes[0] = 0; + for (i=1; i < 16; ++i) + if (sizes[i] > (1 << i)) + return stbi__err("bad sizes", "Corrupt PNG"); + code = 0; + for (i=1; i < 16; ++i) { + next_code[i] = code; + z->firstcode[i] = (stbi__uint16) code; + z->firstsymbol[i] = (stbi__uint16) k; + code = (code + sizes[i]); + if (sizes[i]) + if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); + z->maxcode[i] = code << (16-i); // preshift for inner loop + code <<= 1; + k += sizes[i]; + } + z->maxcode[16] = 0x10000; // sentinel + for (i=0; i < num; ++i) { + int s = sizelist[i]; + if (s) { + int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; + stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); + z->size [c] = (stbi_uc ) s; + z->value[c] = (stbi__uint16) i; + if (s <= STBI__ZFAST_BITS) { + int j = stbi__bit_reverse(next_code[s],s); + while (j < (1 << STBI__ZFAST_BITS)) { + z->fast[j] = fastv; + j += (1 << s); + } + } + ++next_code[s]; + } + } + return 1; +} + +// zlib-from-memory implementation for PNG reading +// because PNG allows splitting the zlib stream arbitrarily, +// and it's annoying structurally to have PNG call ZLIB call PNG, +// we require PNG read all the IDATs and combine them into a single +// memory buffer + +typedef struct +{ + stbi_uc *zbuffer, *zbuffer_end; + int num_bits; + int hit_zeof_once; + stbi__uint32 code_buffer; + + char *zout; + char *zout_start; + char *zout_end; + int z_expandable; + + stbi__zhuffman z_length, z_distance; +} stbi__zbuf; + +stbi_inline static int stbi__zeof(stbi__zbuf *z) +{ + return (z->zbuffer >= z->zbuffer_end); +} + +stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) +{ + return stbi__zeof(z) ? 0 : *z->zbuffer++; +} + +static void stbi__fill_bits(stbi__zbuf *z) +{ + do { + if (z->code_buffer >= (1U << z->num_bits)) { + z->zbuffer = z->zbuffer_end; /* treat this as EOF so we fail. */ + return; + } + z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits; + z->num_bits += 8; + } while (z->num_bits <= 24); +} + +stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) +{ + unsigned int k; + if (z->num_bits < n) stbi__fill_bits(z); + k = z->code_buffer & ((1 << n) - 1); + z->code_buffer >>= n; + z->num_bits -= n; + return k; +} + +static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s,k; + // not resolved by fast table, so compute it the slow way + // use jpeg approach, which requires MSbits at top + k = stbi__bit_reverse(a->code_buffer, 16); + for (s=STBI__ZFAST_BITS+1; ; ++s) + if (k < z->maxcode[s]) + break; + if (s >= 16) return -1; // invalid code! + // code size is s, so: + b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; + if (b >= STBI__ZNSYMS) return -1; // some data was corrupt somewhere! + if (z->size[b] != s) return -1; // was originally an assert, but report failure instead. + a->code_buffer >>= s; + a->num_bits -= s; + return z->value[b]; +} + +stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s; + if (a->num_bits < 16) { + if (stbi__zeof(a)) { + if (!a->hit_zeof_once) { + // This is the first time we hit eof, insert 16 extra padding btis + // to allow us to keep going; if we actually consume any of them + // though, that is invalid data. This is caught later. + a->hit_zeof_once = 1; + a->num_bits += 16; // add 16 implicit zero bits + } else { + // We already inserted our extra 16 padding bits and are again + // out, this stream is actually prematurely terminated. + return -1; + } + } else { + stbi__fill_bits(a); + } + } + b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; + if (b) { + s = b >> 9; + a->code_buffer >>= s; + a->num_bits -= s; + return b & 511; + } + return stbi__zhuffman_decode_slowpath(a, z); +} + +static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes +{ + char *q; + unsigned int cur, limit, old_limit; + z->zout = zout; + if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); + cur = (unsigned int) (z->zout - z->zout_start); + limit = old_limit = (unsigned) (z->zout_end - z->zout_start); + if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory"); + while (cur + n > limit) { + if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory"); + limit *= 2; + } + q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); + STBI_NOTUSED(old_limit); + if (q == NULL) return stbi__err("outofmem", "Out of memory"); + z->zout_start = q; + z->zout = q + cur; + z->zout_end = q + limit; + return 1; +} + +static const int stbi__zlength_base[31] = { + 3,4,5,6,7,8,9,10,11,13, + 15,17,19,23,27,31,35,43,51,59, + 67,83,99,115,131,163,195,227,258,0,0 }; + +static const int stbi__zlength_extra[31]= +{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + +static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, +257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; + +static const int stbi__zdist_extra[32] = +{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; + +static int stbi__parse_huffman_block(stbi__zbuf *a) +{ + char *zout = a->zout; + for(;;) { + int z = stbi__zhuffman_decode(a, &a->z_length); + if (z < 256) { + if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes + if (zout >= a->zout_end) { + if (!stbi__zexpand(a, zout, 1)) return 0; + zout = a->zout; + } + *zout++ = (char) z; + } else { + stbi_uc *p; + int len,dist; + if (z == 256) { + a->zout = zout; + if (a->hit_zeof_once && a->num_bits < 16) { + // The first time we hit zeof, we inserted 16 extra zero bits into our bit + // buffer so the decoder can just do its speculative decoding. But if we + // actually consumed any of those bits (which is the case when num_bits < 16), + // the stream actually read past the end so it is malformed. + return stbi__err("unexpected end","Corrupt PNG"); + } + return 1; + } + if (z >= 286) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, length codes 286 and 287 must not appear in compressed data + z -= 257; + len = stbi__zlength_base[z]; + if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); + z = stbi__zhuffman_decode(a, &a->z_distance); + if (z < 0 || z >= 30) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, distance codes 30 and 31 must not appear in compressed data + dist = stbi__zdist_base[z]; + if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); + if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); + if (len > a->zout_end - zout) { + if (!stbi__zexpand(a, zout, len)) return 0; + zout = a->zout; + } + p = (stbi_uc *) (zout - dist); + if (dist == 1) { // run of one byte; common in images. + stbi_uc v = *p; + if (len) { do *zout++ = v; while (--len); } + } else { + if (len) { do *zout++ = *p++; while (--len); } + } + } + } +} + +static int stbi__compute_huffman_codes(stbi__zbuf *a) +{ + static const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + stbi__zhuffman z_codelength; + stbi_uc lencodes[286+32+137];//padding for maximum single op + stbi_uc codelength_sizes[19]; + int i,n; + + int hlit = stbi__zreceive(a,5) + 257; + int hdist = stbi__zreceive(a,5) + 1; + int hclen = stbi__zreceive(a,4) + 4; + int ntot = hlit + hdist; + + memset(codelength_sizes, 0, sizeof(codelength_sizes)); + for (i=0; i < hclen; ++i) { + int s = stbi__zreceive(a,3); + codelength_sizes[length_dezigzag[i]] = (stbi_uc) s; + } + if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; + + n = 0; + while (n < ntot) { + int c = stbi__zhuffman_decode(a, &z_codelength); + if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG"); + if (c < 16) + lencodes[n++] = (stbi_uc) c; + else { + stbi_uc fill = 0; + if (c == 16) { + c = stbi__zreceive(a,2)+3; + if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG"); + fill = lencodes[n-1]; + } else if (c == 17) { + c = stbi__zreceive(a,3)+3; + } else if (c == 18) { + c = stbi__zreceive(a,7)+11; + } else { + return stbi__err("bad codelengths", "Corrupt PNG"); + } + if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG"); + memset(lencodes+n, fill, c); + n += c; + } + } + if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG"); + if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; + return 1; +} + +static int stbi__parse_uncompressed_block(stbi__zbuf *a) +{ + stbi_uc header[4]; + int len,nlen,k; + if (a->num_bits & 7) + stbi__zreceive(a, a->num_bits & 7); // discard + // drain the bit-packed data into header + k = 0; + while (a->num_bits > 0) { + header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check + a->code_buffer >>= 8; + a->num_bits -= 8; + } + if (a->num_bits < 0) return stbi__err("zlib corrupt","Corrupt PNG"); + // now fill header the normal way + while (k < 4) + header[k++] = stbi__zget8(a); + len = header[1] * 256 + header[0]; + nlen = header[3] * 256 + header[2]; + if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); + if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); + if (a->zout + len > a->zout_end) + if (!stbi__zexpand(a, a->zout, len)) return 0; + memcpy(a->zout, a->zbuffer, len); + a->zbuffer += len; + a->zout += len; + return 1; +} + +static int stbi__parse_zlib_header(stbi__zbuf *a) +{ + int cmf = stbi__zget8(a); + int cm = cmf & 15; + /* int cinfo = cmf >> 4; */ + int flg = stbi__zget8(a); + if (stbi__zeof(a)) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec + if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec + if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png + if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png + // window = 1 << (8 + cinfo)... but who cares, we fully buffer output + return 1; +} + +static const stbi_uc stbi__zdefault_length[STBI__ZNSYMS] = +{ + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 +}; +static const stbi_uc stbi__zdefault_distance[32] = +{ + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 +}; +/* +Init algorithm: +{ + int i; // use <= to match clearly with spec + for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; + for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; + for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; + for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; + + for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; +} +*/ + +static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) +{ + int final, type; + if (parse_header) + if (!stbi__parse_zlib_header(a)) return 0; + a->num_bits = 0; + a->code_buffer = 0; + a->hit_zeof_once = 0; + do { + final = stbi__zreceive(a,1); + type = stbi__zreceive(a,2); + if (type == 0) { + if (!stbi__parse_uncompressed_block(a)) return 0; + } else if (type == 3) { + return 0; + } else { + if (type == 1) { + // use fixed code lengths + if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , STBI__ZNSYMS)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; + } else { + if (!stbi__compute_huffman_codes(a)) return 0; + } + if (!stbi__parse_huffman_block(a)) return 0; + } + } while (!final); + return 1; +} + +static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) +{ + a->zout_start = obuf; + a->zout = obuf; + a->zout_end = obuf + olen; + a->z_expandable = exp; + + return stbi__parse_zlib(a, parse_header); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) +{ + return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) + return (int) (a.zout - a.zout_start); + else + return -1; +} + +STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(16384); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer+len; + if (stbi__do_zlib(&a, p, 16384, 1, 0)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) + return (int) (a.zout - a.zout_start); + else + return -1; +} +#endif + +// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 +// simple implementation +// - only 8-bit samples +// - no CRC checking +// - allocates lots of intermediate memory +// - avoids problem of streaming data between subsystems +// - avoids explicit window management +// performance +// - uses stb_zlib, a PD zlib implementation with fast huffman decoding + +#ifndef STBI_NO_PNG +typedef struct +{ + stbi__uint32 length; + stbi__uint32 type; +} stbi__pngchunk; + +static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) +{ + stbi__pngchunk c; + c.length = stbi__get32be(s); + c.type = stbi__get32be(s); + return c; +} + +static int stbi__check_png_header(stbi__context *s) +{ + static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; + int i; + for (i=0; i < 8; ++i) + if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); + return 1; +} + +typedef struct +{ + stbi__context *s; + stbi_uc *idata, *expanded, *out; + int depth; +} stbi__png; + + +enum { + STBI__F_none=0, + STBI__F_sub=1, + STBI__F_up=2, + STBI__F_avg=3, + STBI__F_paeth=4, + // synthetic filter used for first scanline to avoid needing a dummy row of 0s + STBI__F_avg_first +}; + +static stbi_uc first_row_filter[5] = +{ + STBI__F_none, + STBI__F_sub, + STBI__F_none, + STBI__F_avg_first, + STBI__F_sub // Paeth with b=c=0 turns out to be equivalent to sub +}; + +static int stbi__paeth(int a, int b, int c) +{ + // This formulation looks very different from the reference in the PNG spec, but is + // actually equivalent and has favorable data dependencies and admits straightforward + // generation of branch-free code, which helps performance significantly. + int thresh = c*3 - (a + b); + int lo = a < b ? a : b; + int hi = a < b ? b : a; + int t0 = (hi <= thresh) ? lo : c; + int t1 = (thresh <= lo) ? hi : t0; + return t1; +} + +static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; + +// adds an extra all-255 alpha channel +// dest == src is legal +// img_n must be 1 or 3 +static void stbi__create_png_alpha_expand8(stbi_uc *dest, stbi_uc *src, stbi__uint32 x, int img_n) +{ + int i; + // must process data backwards since we allow dest==src + if (img_n == 1) { + for (i=x-1; i >= 0; --i) { + dest[i*2+1] = 255; + dest[i*2+0] = src[i]; + } + } else { + STBI_ASSERT(img_n == 3); + for (i=x-1; i >= 0; --i) { + dest[i*4+3] = 255; + dest[i*4+2] = src[i*3+2]; + dest[i*4+1] = src[i*3+1]; + dest[i*4+0] = src[i*3+0]; + } + } +} + +// create the png data from post-deflated data +static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) +{ + int bytes = (depth == 16 ? 2 : 1); + stbi__context *s = a->s; + stbi__uint32 i,j,stride = x*out_n*bytes; + stbi__uint32 img_len, img_width_bytes; + stbi_uc *filter_buf; + int all_ok = 1; + int k; + int img_n = s->img_n; // copy it into a local for later + + int output_bytes = out_n*bytes; + int filter_bytes = img_n*bytes; + int width = x; + + STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); + a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into + if (!a->out) return stbi__err("outofmem", "Out of memory"); + + // note: error exits here don't need to clean up a->out individually, + // stbi__do_png always does on error. + if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG"); + img_width_bytes = (((img_n * x * depth) + 7) >> 3); + if (!stbi__mad2sizes_valid(img_width_bytes, y, img_width_bytes)) return stbi__err("too large", "Corrupt PNG"); + img_len = (img_width_bytes + 1) * y; + + // we used to check for exact match between raw_len and img_len on non-interlaced PNGs, + // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros), + // so just check for raw_len < img_len always. + if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); + + // Allocate two scan lines worth of filter workspace buffer. + filter_buf = (stbi_uc *) stbi__malloc_mad2(img_width_bytes, 2, 0); + if (!filter_buf) return stbi__err("outofmem", "Out of memory"); + + // Filtering for low-bit-depth images + if (depth < 8) { + filter_bytes = 1; + width = img_width_bytes; + } + + for (j=0; j < y; ++j) { + // cur/prior filter buffers alternate + stbi_uc *cur = filter_buf + (j & 1)*img_width_bytes; + stbi_uc *prior = filter_buf + (~j & 1)*img_width_bytes; + stbi_uc *dest = a->out + stride*j; + int nk = width * filter_bytes; + int filter = *raw++; + + // check filter type + if (filter > 4) { + all_ok = stbi__err("invalid filter","Corrupt PNG"); + break; + } + + // if first row, use special filter that doesn't sample previous row + if (j == 0) filter = first_row_filter[filter]; + + // perform actual filtering + switch (filter) { + case STBI__F_none: + memcpy(cur, raw, nk); + break; + case STBI__F_sub: + memcpy(cur, raw, filter_bytes); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); + break; + case STBI__F_up: + for (k = 0; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + prior[k]); + break; + case STBI__F_avg: + for (k = 0; k < filter_bytes; ++k) + cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); + break; + case STBI__F_paeth: + for (k = 0; k < filter_bytes; ++k) + cur[k] = STBI__BYTECAST(raw[k] + prior[k]); // prior[k] == stbi__paeth(0,prior[k],0) + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes], prior[k], prior[k-filter_bytes])); + break; + case STBI__F_avg_first: + memcpy(cur, raw, filter_bytes); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); + break; + } + + raw += nk; + + // expand decoded bits in cur to dest, also adding an extra alpha channel if desired + if (depth < 8) { + stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range + stbi_uc *in = cur; + stbi_uc *out = dest; + stbi_uc inb = 0; + stbi__uint32 nsmp = x*img_n; + + // expand bits to bytes first + if (depth == 4) { + for (i=0; i < nsmp; ++i) { + if ((i & 1) == 0) inb = *in++; + *out++ = scale * (inb >> 4); + inb <<= 4; + } + } else if (depth == 2) { + for (i=0; i < nsmp; ++i) { + if ((i & 3) == 0) inb = *in++; + *out++ = scale * (inb >> 6); + inb <<= 2; + } + } else { + STBI_ASSERT(depth == 1); + for (i=0; i < nsmp; ++i) { + if ((i & 7) == 0) inb = *in++; + *out++ = scale * (inb >> 7); + inb <<= 1; + } + } + + // insert alpha=255 values if desired + if (img_n != out_n) + stbi__create_png_alpha_expand8(dest, dest, x, img_n); + } else if (depth == 8) { + if (img_n == out_n) + memcpy(dest, cur, x*img_n); + else + stbi__create_png_alpha_expand8(dest, cur, x, img_n); + } else if (depth == 16) { + // convert the image data from big-endian to platform-native + stbi__uint16 *dest16 = (stbi__uint16*)dest; + stbi__uint32 nsmp = x*img_n; + + if (img_n == out_n) { + for (i = 0; i < nsmp; ++i, ++dest16, cur += 2) + *dest16 = (cur[0] << 8) | cur[1]; + } else { + STBI_ASSERT(img_n+1 == out_n); + if (img_n == 1) { + for (i = 0; i < x; ++i, dest16 += 2, cur += 2) { + dest16[0] = (cur[0] << 8) | cur[1]; + dest16[1] = 0xffff; + } + } else { + STBI_ASSERT(img_n == 3); + for (i = 0; i < x; ++i, dest16 += 4, cur += 6) { + dest16[0] = (cur[0] << 8) | cur[1]; + dest16[1] = (cur[2] << 8) | cur[3]; + dest16[2] = (cur[4] << 8) | cur[5]; + dest16[3] = 0xffff; + } + } + } + } + } + + STBI_FREE(filter_buf); + if (!all_ok) return 0; + + return 1; +} + +static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) +{ + int bytes = (depth == 16 ? 2 : 1); + int out_bytes = out_n * bytes; + stbi_uc *final; + int p; + if (!interlaced) + return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); + + // de-interlacing + final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0); + if (!final) return stbi__err("outofmem", "Out of memory"); + for (p=0; p < 7; ++p) { + int xorig[] = { 0,4,0,2,0,1,0 }; + int yorig[] = { 0,0,4,0,2,0,1 }; + int xspc[] = { 8,8,4,4,2,2,1 }; + int yspc[] = { 8,8,8,4,4,2,2 }; + int i,j,x,y; + // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 + x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; + y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; + if (x && y) { + stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; + if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { + STBI_FREE(final); + return 0; + } + for (j=0; j < y; ++j) { + for (i=0; i < x; ++i) { + int out_y = j*yspc[p]+yorig[p]; + int out_x = i*xspc[p]+xorig[p]; + memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, + a->out + (j*x+i)*out_bytes, out_bytes); + } + } + STBI_FREE(a->out); + image_data += img_len; + image_data_len -= img_len; + } + } + a->out = final; + + return 1; +} + +static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + // compute color-based transparency, assuming we've + // already got 255 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i=0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 255); + p += 2; + } + } else { + for (i=0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi__uint16 *p = (stbi__uint16*) z->out; + + // compute color-based transparency, assuming we've + // already got 65535 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i = 0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 65535); + p += 2; + } + } else { + for (i = 0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) +{ + stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; + stbi_uc *p, *temp_out, *orig = a->out; + + p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0); + if (p == NULL) return stbi__err("outofmem", "Out of memory"); + + // between here and free(out) below, exitting would leak + temp_out = p; + + if (pal_img_n == 3) { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p += 3; + } + } else { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p[3] = palette[n+3]; + p += 4; + } + } + STBI_FREE(a->out); + a->out = temp_out; + + STBI_NOTUSED(len); + + return 1; +} + +static int stbi__unpremultiply_on_load_global = 0; +static int stbi__de_iphone_flag_global = 0; + +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) +{ + stbi__unpremultiply_on_load_global = flag_true_if_should_unpremultiply; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) +{ + stbi__de_iphone_flag_global = flag_true_if_should_convert; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__unpremultiply_on_load stbi__unpremultiply_on_load_global +#define stbi__de_iphone_flag stbi__de_iphone_flag_global +#else +static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set; +static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set; + +STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) +{ + stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply; + stbi__unpremultiply_on_load_set = 1; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert) +{ + stbi__de_iphone_flag_local = flag_true_if_should_convert; + stbi__de_iphone_flag_set = 1; +} + +#define stbi__unpremultiply_on_load (stbi__unpremultiply_on_load_set \ + ? stbi__unpremultiply_on_load_local \ + : stbi__unpremultiply_on_load_global) +#define stbi__de_iphone_flag (stbi__de_iphone_flag_set \ + ? stbi__de_iphone_flag_local \ + : stbi__de_iphone_flag_global) +#endif // STBI_THREAD_LOCAL + +static void stbi__de_iphone(stbi__png *z) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + if (s->img_out_n == 3) { // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 3; + } + } else { + STBI_ASSERT(s->img_out_n == 4); + if (stbi__unpremultiply_on_load) { + // convert bgr to rgb and unpremultiply + for (i=0; i < pixel_count; ++i) { + stbi_uc a = p[3]; + stbi_uc t = p[0]; + if (a) { + stbi_uc half = a / 2; + p[0] = (p[2] * 255 + half) / a; + p[1] = (p[1] * 255 + half) / a; + p[2] = ( t * 255 + half) / a; + } else { + p[0] = p[2]; + p[2] = t; + } + p += 4; + } + } else { + // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 4; + } + } + } +} + +#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d)) + +static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) +{ + stbi_uc palette[1024], pal_img_n=0; + stbi_uc has_trans=0, tc[3]={0}; + stbi__uint16 tc16[3]; + stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; + int first=1,k,interlace=0, color=0, is_iphone=0; + stbi__context *s = z->s; + + z->expanded = NULL; + z->idata = NULL; + z->out = NULL; + + if (!stbi__check_png_header(s)) return 0; + + if (scan == STBI__SCAN_type) return 1; + + for (;;) { + stbi__pngchunk c = stbi__get_chunk_header(s); + switch (c.type) { + case STBI__PNG_TYPE('C','g','B','I'): + is_iphone = 1; + stbi__skip(s, c.length); + break; + case STBI__PNG_TYPE('I','H','D','R'): { + int comp,filter; + if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); + first = 0; + if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); + s->img_x = stbi__get32be(s); + s->img_y = stbi__get32be(s); + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); + color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); + comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); + filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); + interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); + if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); + if (!pal_img_n) { + s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); + if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); + } else { + // if paletted, then pal_n is our final components, and + // img_n is # components to decompress/filter. + s->img_n = 1; + if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); + } + // even with SCAN_header, have to scan to see if we have a tRNS + break; + } + + case STBI__PNG_TYPE('P','L','T','E'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG"); + pal_len = c.length / 3; + if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG"); + for (i=0; i < pal_len; ++i) { + palette[i*4+0] = stbi__get8(s); + palette[i*4+1] = stbi__get8(s); + palette[i*4+2] = stbi__get8(s); + palette[i*4+3] = 255; + } + break; + } + + case STBI__PNG_TYPE('t','R','N','S'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG"); + if (pal_img_n) { + if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } + if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG"); + if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG"); + pal_img_n = 4; + for (i=0; i < c.length; ++i) + palette[i*4+3] = stbi__get8(s); + } else { + if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); + if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); + has_trans = 1; + // non-paletted with tRNS = constant alpha. if header-scanning, we can stop now. + if (scan == STBI__SCAN_header) { ++s->img_n; return 1; } + if (z->depth == 16) { + for (k = 0; k < s->img_n && k < 3; ++k) // extra loop test to suppress false GCC warning + tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is + } else { + for (k = 0; k < s->img_n && k < 3; ++k) + tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger + } + } + break; + } + + case STBI__PNG_TYPE('I','D','A','T'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); + if (scan == STBI__SCAN_header) { + // header scan definitely stops at first IDAT + if (pal_img_n) + s->img_n = pal_img_n; + return 1; + } + if (c.length > (1u << 30)) return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes"); + if ((int)(ioff + c.length) < (int)ioff) return 0; + if (ioff + c.length > idata_limit) { + stbi__uint32 idata_limit_old = idata_limit; + stbi_uc *p; + if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; + while (ioff + c.length > idata_limit) + idata_limit *= 2; + STBI_NOTUSED(idata_limit_old); + p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory"); + z->idata = p; + } + if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG"); + ioff += c.length; + break; + } + + case STBI__PNG_TYPE('I','E','N','D'): { + stbi__uint32 raw_len, bpl; + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (scan != STBI__SCAN_load) return 1; + if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG"); + // initial guess for decoded data size to avoid unnecessary reallocs + bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component + raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; + z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); + if (z->expanded == NULL) return 0; // zlib should set error + STBI_FREE(z->idata); z->idata = NULL; + if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) + s->img_out_n = s->img_n+1; + else + s->img_out_n = s->img_n; + if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0; + if (has_trans) { + if (z->depth == 16) { + if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0; + } else { + if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0; + } + } + if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) + stbi__de_iphone(z); + if (pal_img_n) { + // pal_img_n == 3 or 4 + s->img_n = pal_img_n; // record the actual colors we had + s->img_out_n = pal_img_n; + if (req_comp >= 3) s->img_out_n = req_comp; + if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) + return 0; + } else if (has_trans) { + // non-paletted image with tRNS -> source image has (constant) alpha + ++s->img_n; + } + STBI_FREE(z->expanded); z->expanded = NULL; + // end of PNG chunk, read and skip CRC + stbi__get32be(s); + return 1; + } + + default: + // if critical, fail + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if ((c.type & (1 << 29)) == 0) { + #ifndef STBI_NO_FAILURE_STRINGS + // not threadsafe + static char invalid_chunk[] = "XXXX PNG chunk not known"; + invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); + invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); + invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); + invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); + #endif + return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); + } + stbi__skip(s, c.length); + break; + } + // end of PNG chunk, read and skip CRC + stbi__get32be(s); + } +} + +static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri) +{ + void *result=NULL; + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { + if (p->depth <= 8) + ri->bits_per_channel = 8; + else if (p->depth == 16) + ri->bits_per_channel = 16; + else + return stbi__errpuc("bad bits_per_channel", "PNG not supported: unsupported color depth"); + result = p->out; + p->out = NULL; + if (req_comp && req_comp != p->s->img_out_n) { + if (ri->bits_per_channel == 8) + result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + else + result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + p->s->img_out_n = req_comp; + if (result == NULL) return result; + } + *x = p->s->img_x; + *y = p->s->img_y; + if (n) *n = p->s->img_n; + } + STBI_FREE(p->out); p->out = NULL; + STBI_FREE(p->expanded); p->expanded = NULL; + STBI_FREE(p->idata); p->idata = NULL; + + return result; +} + +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi__png p; + p.s = s; + return stbi__do_png(&p, x,y,comp,req_comp, ri); +} + +static int stbi__png_test(stbi__context *s) +{ + int r; + r = stbi__check_png_header(s); + stbi__rewind(s); + return r; +} + +static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) +{ + if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { + stbi__rewind( p->s ); + return 0; + } + if (x) *x = p->s->img_x; + if (y) *y = p->s->img_y; + if (comp) *comp = p->s->img_n; + return 1; +} + +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__png p; + p.s = s; + return stbi__png_info_raw(&p, x, y, comp); +} + +static int stbi__png_is16(stbi__context *s) +{ + stbi__png p; + p.s = s; + if (!stbi__png_info_raw(&p, NULL, NULL, NULL)) + return 0; + if (p.depth != 16) { + stbi__rewind(p.s); + return 0; + } + return 1; +} +#endif + +// Microsoft/Windows BMP image + +#ifndef STBI_NO_BMP +static int stbi__bmp_test_raw(stbi__context *s) +{ + int r; + int sz; + if (stbi__get8(s) != 'B') return 0; + if (stbi__get8(s) != 'M') return 0; + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + stbi__get32le(s); // discard data offset + sz = stbi__get32le(s); + r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); + return r; +} + +static int stbi__bmp_test(stbi__context *s) +{ + int r = stbi__bmp_test_raw(s); + stbi__rewind(s); + return r; +} + + +// returns 0..31 for the highest set bit +static int stbi__high_bit(unsigned int z) +{ + int n=0; + if (z == 0) return -1; + if (z >= 0x10000) { n += 16; z >>= 16; } + if (z >= 0x00100) { n += 8; z >>= 8; } + if (z >= 0x00010) { n += 4; z >>= 4; } + if (z >= 0x00004) { n += 2; z >>= 2; } + if (z >= 0x00002) { n += 1;/* >>= 1;*/ } + return n; +} + +static int stbi__bitcount(unsigned int a) +{ + a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 + a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 + a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits + a = (a + (a >> 8)); // max 16 per 8 bits + a = (a + (a >> 16)); // max 32 per 8 bits + return a & 0xff; +} + +// extract an arbitrarily-aligned N-bit value (N=bits) +// from v, and then make it 8-bits long and fractionally +// extend it to full full range. +static int stbi__shiftsigned(unsigned int v, int shift, int bits) +{ + static unsigned int mul_table[9] = { + 0, + 0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/, + 0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/, + }; + static unsigned int shift_table[9] = { + 0, 0,0,1,0,2,4,6,0, + }; + if (shift < 0) + v <<= -shift; + else + v >>= shift; + STBI_ASSERT(v < 256); + v >>= (8-bits); + STBI_ASSERT(bits >= 0 && bits <= 8); + return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits]; +} + +typedef struct +{ + int bpp, offset, hsz; + unsigned int mr,mg,mb,ma, all_a; + int extra_read; +} stbi__bmp_data; + +static int stbi__bmp_set_mask_defaults(stbi__bmp_data *info, int compress) +{ + // BI_BITFIELDS specifies masks explicitly, don't override + if (compress == 3) + return 1; + + if (compress == 0) { + if (info->bpp == 16) { + info->mr = 31u << 10; + info->mg = 31u << 5; + info->mb = 31u << 0; + } else if (info->bpp == 32) { + info->mr = 0xffu << 16; + info->mg = 0xffu << 8; + info->mb = 0xffu << 0; + info->ma = 0xffu << 24; + info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 + } else { + // otherwise, use defaults, which is all-0 + info->mr = info->mg = info->mb = info->ma = 0; + } + return 1; + } + return 0; // error +} + +static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) +{ + int hsz; + if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + info->offset = stbi__get32le(s); + info->hsz = hsz = stbi__get32le(s); + info->mr = info->mg = info->mb = info->ma = 0; + info->extra_read = 14; + + if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP"); + + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); + if (hsz == 12) { + s->img_x = stbi__get16le(s); + s->img_y = stbi__get16le(s); + } else { + s->img_x = stbi__get32le(s); + s->img_y = stbi__get32le(s); + } + if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); + info->bpp = stbi__get16le(s); + if (hsz != 12) { + int compress = stbi__get32le(s); + if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); + if (compress >= 4) return stbi__errpuc("BMP JPEG/PNG", "BMP type not supported: unsupported compression"); // this includes PNG/JPEG modes + if (compress == 3 && info->bpp != 16 && info->bpp != 32) return stbi__errpuc("bad BMP", "bad BMP"); // bitfields requires 16 or 32 bits/pixel + stbi__get32le(s); // discard sizeof + stbi__get32le(s); // discard hres + stbi__get32le(s); // discard vres + stbi__get32le(s); // discard colorsused + stbi__get32le(s); // discard max important + if (hsz == 40 || hsz == 56) { + if (hsz == 56) { + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + } + if (info->bpp == 16 || info->bpp == 32) { + if (compress == 0) { + stbi__bmp_set_mask_defaults(info, compress); + } else if (compress == 3) { + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + info->extra_read += 12; + // not documented, but generated by photoshop and handled by mspaint + if (info->mr == info->mg && info->mg == info->mb) { + // ?!?!? + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else { + // V4/V5 header + int i; + if (hsz != 108 && hsz != 124) + return stbi__errpuc("bad BMP", "bad BMP"); + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + info->ma = stbi__get32le(s); + if (compress != 3) // override mr/mg/mb unless in BI_BITFIELDS mode, as per docs + stbi__bmp_set_mask_defaults(info, compress); + stbi__get32le(s); // discard color space + for (i=0; i < 12; ++i) + stbi__get32le(s); // discard color space parameters + if (hsz == 124) { + stbi__get32le(s); // discard rendering intent + stbi__get32le(s); // discard offset of profile data + stbi__get32le(s); // discard size of profile data + stbi__get32le(s); // discard reserved + } + } + } + return (void *) 1; +} + + +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + unsigned int mr=0,mg=0,mb=0,ma=0, all_a; + stbi_uc pal[256][4]; + int psize=0,i,j,width; + int flip_vertically, pad, target; + stbi__bmp_data info; + STBI_NOTUSED(ri); + + info.all_a = 255; + if (stbi__bmp_parse_header(s, &info) == NULL) + return NULL; // error code already set + + flip_vertically = ((int) s->img_y) > 0; + s->img_y = abs((int) s->img_y); + + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + mr = info.mr; + mg = info.mg; + mb = info.mb; + ma = info.ma; + all_a = info.all_a; + + if (info.hsz == 12) { + if (info.bpp < 24) + psize = (info.offset - info.extra_read - 24) / 3; + } else { + if (info.bpp < 16) + psize = (info.offset - info.extra_read - info.hsz) >> 2; + } + if (psize == 0) { + // accept some number of extra bytes after the header, but if the offset points either to before + // the header ends or implies a large amount of extra data, reject the file as malformed + int bytes_read_so_far = s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original); + int header_limit = 1024; // max we actually read is below 256 bytes currently. + int extra_data_limit = 256*4; // what ordinarily goes here is a palette; 256 entries*4 bytes is its max size. + if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) { + return stbi__errpuc("bad header", "Corrupt BMP"); + } + // we established that bytes_read_so_far is positive and sensible. + // the first half of this test rejects offsets that are either too small positives, or + // negative, and guarantees that info.offset >= bytes_read_so_far > 0. this in turn + // ensures the number computed in the second half of the test can't overflow. + if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) { + return stbi__errpuc("bad offset", "Corrupt BMP"); + } else { + stbi__skip(s, info.offset - bytes_read_so_far); + } + } + + if (info.bpp == 24 && ma == 0xff000000) + s->img_n = 3; + else + s->img_n = ma ? 4 : 3; + if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 + target = req_comp; + else + target = s->img_n; // if they want monochrome, we'll post-convert + + // sanity-check size + if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0)) + return stbi__errpuc("too large", "Corrupt BMP"); + + out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + if (info.bpp < 16) { + int z=0; + if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } + for (i=0; i < psize; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + if (info.hsz != 12) stbi__get8(s); + pal[i][3] = 255; + } + stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); + if (info.bpp == 1) width = (s->img_x + 7) >> 3; + else if (info.bpp == 4) width = (s->img_x + 1) >> 1; + else if (info.bpp == 8) width = s->img_x; + else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } + pad = (-width)&3; + if (info.bpp == 1) { + for (j=0; j < (int) s->img_y; ++j) { + int bit_offset = 7, v = stbi__get8(s); + for (i=0; i < (int) s->img_x; ++i) { + int color = (v>>bit_offset)&0x1; + out[z++] = pal[color][0]; + out[z++] = pal[color][1]; + out[z++] = pal[color][2]; + if (target == 4) out[z++] = 255; + if (i+1 == (int) s->img_x) break; + if((--bit_offset) < 0) { + bit_offset = 7; + v = stbi__get8(s); + } + } + stbi__skip(s, pad); + } + } else { + for (j=0; j < (int) s->img_y; ++j) { + for (i=0; i < (int) s->img_x; i += 2) { + int v=stbi__get8(s),v2=0; + if (info.bpp == 4) { + v2 = v & 15; + v >>= 4; + } + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + if (i+1 == (int) s->img_x) break; + v = (info.bpp == 8) ? stbi__get8(s) : v2; + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + } + stbi__skip(s, pad); + } + } + } else { + int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; + int z = 0; + int easy=0; + stbi__skip(s, info.offset - info.extra_read - info.hsz); + if (info.bpp == 24) width = 3 * s->img_x; + else if (info.bpp == 16) width = 2*s->img_x; + else /* bpp = 32 and pad = 0 */ width=0; + pad = (-width) & 3; + if (info.bpp == 24) { + easy = 1; + } else if (info.bpp == 32) { + if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) + easy = 2; + } + if (!easy) { + if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } + // right shift amt to put high bit in position #7 + rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); + gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); + bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); + ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); + if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } + } + for (j=0; j < (int) s->img_y; ++j) { + if (easy) { + for (i=0; i < (int) s->img_x; ++i) { + unsigned char a; + out[z+2] = stbi__get8(s); + out[z+1] = stbi__get8(s); + out[z+0] = stbi__get8(s); + z += 3; + a = (easy == 2 ? stbi__get8(s) : 255); + all_a |= a; + if (target == 4) out[z++] = a; + } + } else { + int bpp = info.bpp; + for (i=0; i < (int) s->img_x; ++i) { + stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s)); + unsigned int a; + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); + a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); + all_a |= a; + if (target == 4) out[z++] = STBI__BYTECAST(a); + } + } + stbi__skip(s, pad); + } + } + + // if alpha channel is all 0s, replace with all 255s + if (target == 4 && all_a == 0) + for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) + out[i] = 255; + + if (flip_vertically) { + stbi_uc t; + for (j=0; j < (int) s->img_y>>1; ++j) { + stbi_uc *p1 = out + j *s->img_x*target; + stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; + for (i=0; i < (int) s->img_x*target; ++i) { + t = p1[i]; p1[i] = p2[i]; p2[i] = t; + } + } + } + + if (req_comp && req_comp != target) { + out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + *x = s->img_x; + *y = s->img_y; + if (comp) *comp = s->img_n; + return out; +} +#endif + +// Targa Truevision - TGA +// by Jonathan Dummer +#ifndef STBI_NO_TGA +// returns STBI_rgb or whatever, 0 on error +static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) +{ + // only RGB or RGBA (incl. 16bit) or grey allowed + if (is_rgb16) *is_rgb16 = 0; + switch(bits_per_pixel) { + case 8: return STBI_grey; + case 16: if(is_grey) return STBI_grey_alpha; + // fallthrough + case 15: if(is_rgb16) *is_rgb16 = 1; + return STBI_rgb; + case 24: // fallthrough + case 32: return bits_per_pixel/8; + default: return 0; + } +} + +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) +{ + int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; + int sz, tga_colormap_type; + stbi__get8(s); // discard Offset + tga_colormap_type = stbi__get8(s); // colormap type + if( tga_colormap_type > 1 ) { + stbi__rewind(s); + return 0; // only RGB or indexed allowed + } + tga_image_type = stbi__get8(s); // image type + if ( tga_colormap_type == 1 ) { // colormapped (paletted) image + if (tga_image_type != 1 && tga_image_type != 9) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip image x and y origin + tga_colormap_bpp = sz; + } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE + if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { + stbi__rewind(s); + return 0; // only RGB or grey allowed, +/- RLE + } + stbi__skip(s,9); // skip colormap specification and image x/y origin + tga_colormap_bpp = 0; + } + tga_w = stbi__get16le(s); + if( tga_w < 1 ) { + stbi__rewind(s); + return 0; // test width + } + tga_h = stbi__get16le(s); + if( tga_h < 1 ) { + stbi__rewind(s); + return 0; // test height + } + tga_bits_per_pixel = stbi__get8(s); // bits per pixel + stbi__get8(s); // ignore alpha bits + if (tga_colormap_bpp != 0) { + if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { + // when using a colormap, tga_bits_per_pixel is the size of the indexes + // I don't think anything but 8 or 16bit indexes makes sense + stbi__rewind(s); + return 0; + } + tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL); + } else { + tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); + } + if(!tga_comp) { + stbi__rewind(s); + return 0; + } + if (x) *x = tga_w; + if (y) *y = tga_h; + if (comp) *comp = tga_comp; + return 1; // seems to have passed everything +} + +static int stbi__tga_test(stbi__context *s) +{ + int res = 0; + int sz, tga_color_type; + stbi__get8(s); // discard Offset + tga_color_type = stbi__get8(s); // color type + if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed + sz = stbi__get8(s); // image type + if ( tga_color_type == 1 ) { // colormapped (paletted) image + if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + stbi__skip(s,4); // skip image x and y origin + } else { // "normal" image w/o colormap + if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE + stbi__skip(s,9); // skip colormap specification and image x/y origin + } + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height + sz = stbi__get8(s); // bits per pixel + if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + + res = 1; // if we got this far, everything's good and we can return 1 instead of 0 + +errorEnd: + stbi__rewind(s); + return res; +} + +// read 16bit value and convert to 24bit RGB +static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out) +{ + stbi__uint16 px = (stbi__uint16)stbi__get16le(s); + stbi__uint16 fiveBitMask = 31; + // we have 3 channels with 5bits each + int r = (px >> 10) & fiveBitMask; + int g = (px >> 5) & fiveBitMask; + int b = px & fiveBitMask; + // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later + out[0] = (stbi_uc)((r * 255)/31); + out[1] = (stbi_uc)((g * 255)/31); + out[2] = (stbi_uc)((b * 255)/31); + + // some people claim that the most significant bit might be used for alpha + // (possibly if an alpha-bit is set in the "image descriptor byte") + // but that only made 16bit test images completely translucent.. + // so let's treat all 15 and 16bit TGAs as RGB with no alpha. +} + +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + // read in the TGA header stuff + int tga_offset = stbi__get8(s); + int tga_indexed = stbi__get8(s); + int tga_image_type = stbi__get8(s); + int tga_is_RLE = 0; + int tga_palette_start = stbi__get16le(s); + int tga_palette_len = stbi__get16le(s); + int tga_palette_bits = stbi__get8(s); + int tga_x_origin = stbi__get16le(s); + int tga_y_origin = stbi__get16le(s); + int tga_width = stbi__get16le(s); + int tga_height = stbi__get16le(s); + int tga_bits_per_pixel = stbi__get8(s); + int tga_comp, tga_rgb16=0; + int tga_inverted = stbi__get8(s); + // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) + // image data + unsigned char *tga_data; + unsigned char *tga_palette = NULL; + int i, j; + unsigned char raw_data[4] = {0}; + int RLE_count = 0; + int RLE_repeating = 0; + int read_next_pixel = 1; + STBI_NOTUSED(ri); + STBI_NOTUSED(tga_x_origin); // @TODO + STBI_NOTUSED(tga_y_origin); // @TODO + + if (tga_height > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (tga_width > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + // do a tiny bit of precessing + if ( tga_image_type >= 8 ) + { + tga_image_type -= 8; + tga_is_RLE = 1; + } + tga_inverted = 1 - ((tga_inverted >> 5) & 1); + + // If I'm paletted, then I'll use the number of bits from the palette + if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); + else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); + + if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency + return stbi__errpuc("bad format", "Can't find out TGA pixelformat"); + + // tga info + *x = tga_width; + *y = tga_height; + if (comp) *comp = tga_comp; + + if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0)) + return stbi__errpuc("too large", "Corrupt TGA"); + + tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0); + if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); + + // skip to the data's starting position (offset usually = 0) + stbi__skip(s, tga_offset ); + + if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { + for (i=0; i < tga_height; ++i) { + int row = tga_inverted ? tga_height -i - 1 : i; + stbi_uc *tga_row = tga_data + row*tga_width*tga_comp; + stbi__getn(s, tga_row, tga_width * tga_comp); + } + } else { + // do I need to load a palette? + if ( tga_indexed) + { + if (tga_palette_len == 0) { /* you have to have at least one entry! */ + STBI_FREE(tga_data); + return stbi__errpuc("bad palette", "Corrupt TGA"); + } + + // any data to skip? (offset usually = 0) + stbi__skip(s, tga_palette_start ); + // load the palette + tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0); + if (!tga_palette) { + STBI_FREE(tga_data); + return stbi__errpuc("outofmem", "Out of memory"); + } + if (tga_rgb16) { + stbi_uc *pal_entry = tga_palette; + STBI_ASSERT(tga_comp == STBI_rgb); + for (i=0; i < tga_palette_len; ++i) { + stbi__tga_read_rgb16(s, pal_entry); + pal_entry += tga_comp; + } + } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { + STBI_FREE(tga_data); + STBI_FREE(tga_palette); + return stbi__errpuc("bad palette", "Corrupt TGA"); + } + } + // load the data + for (i=0; i < tga_width * tga_height; ++i) + { + // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? + if ( tga_is_RLE ) + { + if ( RLE_count == 0 ) + { + // yep, get the next byte as a RLE command + int RLE_cmd = stbi__get8(s); + RLE_count = 1 + (RLE_cmd & 127); + RLE_repeating = RLE_cmd >> 7; + read_next_pixel = 1; + } else if ( !RLE_repeating ) + { + read_next_pixel = 1; + } + } else + { + read_next_pixel = 1; + } + // OK, if I need to read a pixel, do it now + if ( read_next_pixel ) + { + // load however much data we did have + if ( tga_indexed ) + { + // read in index, then perform the lookup + int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s); + if ( pal_idx >= tga_palette_len ) { + // invalid index + pal_idx = 0; + } + pal_idx *= tga_comp; + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = tga_palette[pal_idx+j]; + } + } else if(tga_rgb16) { + STBI_ASSERT(tga_comp == STBI_rgb); + stbi__tga_read_rgb16(s, raw_data); + } else { + // read in the data raw + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = stbi__get8(s); + } + } + // clear the reading flag for the next pixel + read_next_pixel = 0; + } // end of reading a pixel + + // copy data + for (j = 0; j < tga_comp; ++j) + tga_data[i*tga_comp+j] = raw_data[j]; + + // in case we're in RLE mode, keep counting down + --RLE_count; + } + // do I need to invert the image? + if ( tga_inverted ) + { + for (j = 0; j*2 < tga_height; ++j) + { + int index1 = j * tga_width * tga_comp; + int index2 = (tga_height - 1 - j) * tga_width * tga_comp; + for (i = tga_width * tga_comp; i > 0; --i) + { + unsigned char temp = tga_data[index1]; + tga_data[index1] = tga_data[index2]; + tga_data[index2] = temp; + ++index1; + ++index2; + } + } + } + // clear my palette, if I had one + if ( tga_palette != NULL ) + { + STBI_FREE( tga_palette ); + } + } + + // swap RGB - if the source data was RGB16, it already is in the right order + if (tga_comp >= 3 && !tga_rgb16) + { + unsigned char* tga_pixel = tga_data; + for (i=0; i < tga_width * tga_height; ++i) + { + unsigned char temp = tga_pixel[0]; + tga_pixel[0] = tga_pixel[2]; + tga_pixel[2] = temp; + tga_pixel += tga_comp; + } + } + + // convert to target component count + if (req_comp && req_comp != tga_comp) + tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); + + // the things I do to get rid of an error message, and yet keep + // Microsoft's C compilers happy... [8^( + tga_palette_start = tga_palette_len = tga_palette_bits = + tga_x_origin = tga_y_origin = 0; + STBI_NOTUSED(tga_palette_start); + // OK, done + return tga_data; +} +#endif + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s) +{ + int r = (stbi__get32be(s) == 0x38425053); + stbi__rewind(s); + return r; +} + +static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount) +{ + int count, nleft, len; + + count = 0; + while ((nleft = pixelCount - count) > 0) { + len = stbi__get8(s); + if (len == 128) { + // No-op. + } else if (len < 128) { + // Copy next len+1 bytes literally. + len++; + if (len > nleft) return 0; // corrupt data + count += len; + while (len) { + *p = stbi__get8(s); + p += 4; + len--; + } + } else if (len > 128) { + stbi_uc val; + // Next -len+1 bytes in the dest are replicated from next source byte. + // (Interpret len as a negative 8-bit int.) + len = 257 - len; + if (len > nleft) return 0; // corrupt data + val = stbi__get8(s); + count += len; + while (len) { + *p = val; + p += 4; + len--; + } + } + } + + return 1; +} + +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + int pixelCount; + int channelCount, compression; + int channel, i; + int bitdepth; + int w,h; + stbi_uc *out; + STBI_NOTUSED(ri); + + // Check identifier + if (stbi__get32be(s) != 0x38425053) // "8BPS" + return stbi__errpuc("not PSD", "Corrupt PSD image"); + + // Check file type version. + if (stbi__get16be(s) != 1) + return stbi__errpuc("wrong version", "Unsupported version of PSD image"); + + // Skip 6 reserved bytes. + stbi__skip(s, 6 ); + + // Read the number of channels (R, G, B, A, etc). + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) + return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); + + // Read the rows and columns of the image. + h = stbi__get32be(s); + w = stbi__get32be(s); + + if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + // Make sure the depth is 8 bits. + bitdepth = stbi__get16be(s); + if (bitdepth != 8 && bitdepth != 16) + return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); + + // Make sure the color mode is RGB. + // Valid options are: + // 0: Bitmap + // 1: Grayscale + // 2: Indexed color + // 3: RGB color + // 4: CMYK color + // 7: Multichannel + // 8: Duotone + // 9: Lab color + if (stbi__get16be(s) != 3) + return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); + + // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) + stbi__skip(s,stbi__get32be(s) ); + + // Skip the image resources. (resolution, pen tool paths, etc) + stbi__skip(s, stbi__get32be(s) ); + + // Skip the reserved data. + stbi__skip(s, stbi__get32be(s) ); + + // Find out if the data is compressed. + // Known values: + // 0: no compression + // 1: RLE compressed + compression = stbi__get16be(s); + if (compression > 1) + return stbi__errpuc("bad compression", "PSD has an unknown compression format"); + + // Check size + if (!stbi__mad3sizes_valid(4, w, h, 0)) + return stbi__errpuc("too large", "Corrupt PSD"); + + // Create the destination image. + + if (!compression && bitdepth == 16 && bpc == 16) { + out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0); + ri->bits_per_channel = 16; + } else + out = (stbi_uc *) stbi__malloc(4 * w*h); + + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + pixelCount = w*h; + + // Initialize the data to zero. + //memset( out, 0, pixelCount * 4 ); + + // Finally, the image data. + if (compression) { + // RLE as used by .PSD and .TIFF + // Loop until you get the number of unpacked bytes you are expecting: + // Read the next source byte into n. + // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. + // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. + // Else if n is 128, noop. + // Endloop + + // The RLE-compressed data is preceded by a 2-byte data count for each row in the data, + // which we're going to just skip. + stbi__skip(s, h * channelCount * 2 ); + + // Read the RLE data by channel. + for (channel = 0; channel < 4; channel++) { + stbi_uc *p; + + p = out+channel; + if (channel >= channelCount) { + // Fill this channel with default data. + for (i = 0; i < pixelCount; i++, p += 4) + *p = (channel == 3 ? 255 : 0); + } else { + // Read the RLE data. + if (!stbi__psd_decode_rle(s, p, pixelCount)) { + STBI_FREE(out); + return stbi__errpuc("corrupt", "bad RLE data"); + } + } + } + + } else { + // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) + // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. + + // Read the data by channel. + for (channel = 0; channel < 4; channel++) { + if (channel >= channelCount) { + // Fill this channel with default data. + if (bitdepth == 16 && bpc == 16) { + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + stbi__uint16 val = channel == 3 ? 65535 : 0; + for (i = 0; i < pixelCount; i++, q += 4) + *q = val; + } else { + stbi_uc *p = out+channel; + stbi_uc val = channel == 3 ? 255 : 0; + for (i = 0; i < pixelCount; i++, p += 4) + *p = val; + } + } else { + if (ri->bits_per_channel == 16) { // output bpc + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + for (i = 0; i < pixelCount; i++, q += 4) + *q = (stbi__uint16) stbi__get16be(s); + } else { + stbi_uc *p = out+channel; + if (bitdepth == 16) { // input bpc + for (i = 0; i < pixelCount; i++, p += 4) + *p = (stbi_uc) (stbi__get16be(s) >> 8); + } else { + for (i = 0; i < pixelCount; i++, p += 4) + *p = stbi__get8(s); + } + } + } + } + } + + // remove weird white matte from PSD + if (channelCount >= 4) { + if (ri->bits_per_channel == 16) { + for (i=0; i < w*h; ++i) { + stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i; + if (pixel[3] != 0 && pixel[3] != 65535) { + float a = pixel[3] / 65535.0f; + float ra = 1.0f / a; + float inv_a = 65535.0f * (1 - ra); + pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a); + pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a); + pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a); + } + } + } else { + for (i=0; i < w*h; ++i) { + unsigned char *pixel = out + 4*i; + if (pixel[3] != 0 && pixel[3] != 255) { + float a = pixel[3] / 255.0f; + float ra = 1.0f / a; + float inv_a = 255.0f * (1 - ra); + pixel[0] = (unsigned char) (pixel[0]*ra + inv_a); + pixel[1] = (unsigned char) (pixel[1]*ra + inv_a); + pixel[2] = (unsigned char) (pixel[2]*ra + inv_a); + } + } + } + } + + // convert to desired output format + if (req_comp && req_comp != 4) { + if (ri->bits_per_channel == 16) + out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h); + else + out = stbi__convert_format(out, 4, req_comp, w, h); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + if (comp) *comp = 4; + *y = h; + *x = w; + + return out; +} +#endif + +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon +// +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +#ifndef STBI_NO_PIC +static int stbi__pic_is4(stbi__context *s,const char *str) +{ + int i; + for (i=0; i<4; ++i) + if (stbi__get8(s) != (stbi_uc)str[i]) + return 0; + + return 1; +} + +static int stbi__pic_test_core(stbi__context *s) +{ + int i; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) + return 0; + + for(i=0;i<84;++i) + stbi__get8(s); + + if (!stbi__pic_is4(s,"PICT")) + return 0; + + return 1; +} + +typedef struct +{ + stbi_uc size,type,channel; +} stbi__pic_packet; + +static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) +{ + int mask=0x80, i; + + for (i=0; i<4; ++i, mask>>=1) { + if (channel & mask) { + if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); + dest[i]=stbi__get8(s); + } + } + + return dest; +} + +static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src) +{ + int mask=0x80,i; + + for (i=0;i<4; ++i, mask>>=1) + if (channel&mask) + dest[i]=src[i]; +} + +static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result) +{ + int act_comp=0,num_packets=0,y,chained; + stbi__pic_packet packets[10]; + + // this will (should...) cater for even some bizarre stuff like having data + // for the same channel in multiple packets. + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return stbi__errpuc("bad format","too many packets"); + + packet = &packets[num_packets++]; + + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + + act_comp |= packet->channel; + + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); + if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? + + for(y=0; ytype) { + default: + return stbi__errpuc("bad format","packet has bad compression type"); + + case 0: {//uncompressed + int x; + + for(x=0;xchannel,dest)) + return 0; + break; + } + + case 1://Pure RLE + { + int left=width, i; + + while (left>0) { + stbi_uc count,value[4]; + + count=stbi__get8(s); + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); + + if (count > left) + count = (stbi_uc) left; + + if (!stbi__readval(s,packet->channel,value)) return 0; + + for(i=0; ichannel,dest,value); + left -= count; + } + } + break; + + case 2: {//Mixed RLE + int left=width; + while (left>0) { + int count = stbi__get8(s), i; + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); + + if (count >= 128) { // Repeated + stbi_uc value[4]; + + if (count==128) + count = stbi__get16be(s); + else + count -= 127; + if (count > left) + return stbi__errpuc("bad file","scanline overrun"); + + if (!stbi__readval(s,packet->channel,value)) + return 0; + + for(i=0;ichannel,dest,value); + } else { // Raw + ++count; + if (count>left) return stbi__errpuc("bad file","scanline overrun"); + + for(i=0;ichannel,dest)) + return 0; + } + left-=count; + } + break; + } + } + } + } + + return result; +} + +static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) +{ + stbi_uc *result; + int i, x,y, internal_comp; + STBI_NOTUSED(ri); + + if (!comp) comp = &internal_comp; + + for (i=0; i<92; ++i) + stbi__get8(s); + + x = stbi__get16be(s); + y = stbi__get16be(s); + + if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); + if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode"); + + stbi__get32be(s); //skip `ratio' + stbi__get16be(s); //skip `fields' + stbi__get16be(s); //skip `pad' + + // intermediate buffer is RGBA + result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0); + if (!result) return stbi__errpuc("outofmem", "Out of memory"); + memset(result, 0xff, x*y*4); + + if (!stbi__pic_load_core(s,x,y,comp, result)) { + STBI_FREE(result); + result=0; + } + *px = x; + *py = y; + if (req_comp == 0) req_comp = *comp; + result=stbi__convert_format(result,4,req_comp,x,y); + + return result; +} + +static int stbi__pic_test(stbi__context *s) +{ + int r = stbi__pic_test_core(s); + stbi__rewind(s); + return r; +} +#endif + +// ************************************************************************************************* +// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb + +#ifndef STBI_NO_GIF +typedef struct +{ + stbi__int16 prefix; + stbi_uc first; + stbi_uc suffix; +} stbi__gif_lzw; + +typedef struct +{ + int w,h; + stbi_uc *out; // output buffer (always 4 components) + stbi_uc *background; // The current "background" as far as a gif is concerned + stbi_uc *history; + int flags, bgindex, ratio, transparent, eflags; + stbi_uc pal[256][4]; + stbi_uc lpal[256][4]; + stbi__gif_lzw codes[8192]; + stbi_uc *color_table; + int parse, step; + int lflags; + int start_x, start_y; + int max_x, max_y; + int cur_x, cur_y; + int line_size; + int delay; +} stbi__gif; + +static int stbi__gif_test_raw(stbi__context *s) +{ + int sz; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; + sz = stbi__get8(s); + if (sz != '9' && sz != '7') return 0; + if (stbi__get8(s) != 'a') return 0; + return 1; +} + +static int stbi__gif_test(stbi__context *s) +{ + int r = stbi__gif_test_raw(s); + stbi__rewind(s); + return r; +} + +static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp) +{ + int i; + for (i=0; i < num_entries; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + pal[i][3] = transp == i ? 0 : 255; + } +} + +static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) +{ + stbi_uc version; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') + return stbi__err("not GIF", "Corrupt GIF"); + + version = stbi__get8(s); + if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); + if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); + + stbi__g_failure_reason = ""; + g->w = stbi__get16le(s); + g->h = stbi__get16le(s); + g->flags = stbi__get8(s); + g->bgindex = stbi__get8(s); + g->ratio = stbi__get8(s); + g->transparent = -1; + + if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + + if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments + + if (is_info) return 1; + + if (g->flags & 0x80) + stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); + + return 1; +} + +static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif)); + if (!g) return stbi__err("outofmem", "Out of memory"); + if (!stbi__gif_header(s, g, comp, 1)) { + STBI_FREE(g); + stbi__rewind( s ); + return 0; + } + if (x) *x = g->w; + if (y) *y = g->h; + STBI_FREE(g); + return 1; +} + +static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) +{ + stbi_uc *p, *c; + int idx; + + // recurse to decode the prefixes, since the linked-list is backwards, + // and working backwards through an interleaved image would be nasty + if (g->codes[code].prefix >= 0) + stbi__out_gif_code(g, g->codes[code].prefix); + + if (g->cur_y >= g->max_y) return; + + idx = g->cur_x + g->cur_y; + p = &g->out[idx]; + g->history[idx / 4] = 1; + + c = &g->color_table[g->codes[code].suffix * 4]; + if (c[3] > 128) { // don't render transparent pixels; + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } + g->cur_x += 4; + + if (g->cur_x >= g->max_x) { + g->cur_x = g->start_x; + g->cur_y += g->step; + + while (g->cur_y >= g->max_y && g->parse > 0) { + g->step = (1 << g->parse) * g->line_size; + g->cur_y = g->start_y + (g->step >> 1); + --g->parse; + } + } +} + +static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) +{ + stbi_uc lzw_cs; + stbi__int32 len, init_code; + stbi__uint32 first; + stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; + stbi__gif_lzw *p; + + lzw_cs = stbi__get8(s); + if (lzw_cs > 12) return NULL; + clear = 1 << lzw_cs; + first = 1; + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + bits = 0; + valid_bits = 0; + for (init_code = 0; init_code < clear; init_code++) { + g->codes[init_code].prefix = -1; + g->codes[init_code].first = (stbi_uc) init_code; + g->codes[init_code].suffix = (stbi_uc) init_code; + } + + // support no starting clear code + avail = clear+2; + oldcode = -1; + + len = 0; + for(;;) { + if (valid_bits < codesize) { + if (len == 0) { + len = stbi__get8(s); // start new block + if (len == 0) + return g->out; + } + --len; + bits |= (stbi__int32) stbi__get8(s) << valid_bits; + valid_bits += 8; + } else { + stbi__int32 code = bits & codemask; + bits >>= codesize; + valid_bits -= codesize; + // @OPTIMIZE: is there some way we can accelerate the non-clear path? + if (code == clear) { // clear code + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + avail = clear + 2; + oldcode = -1; + first = 0; + } else if (code == clear + 1) { // end of stream code + stbi__skip(s, len); + while ((len = stbi__get8(s)) > 0) + stbi__skip(s,len); + return g->out; + } else if (code <= avail) { + if (first) { + return stbi__errpuc("no clear code", "Corrupt GIF"); + } + + if (oldcode >= 0) { + p = &g->codes[avail++]; + if (avail > 8192) { + return stbi__errpuc("too many codes", "Corrupt GIF"); + } + + p->prefix = (stbi__int16) oldcode; + p->first = g->codes[oldcode].first; + p->suffix = (code == avail) ? p->first : g->codes[code].first; + } else if (code == avail) + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + + stbi__out_gif_code(g, (stbi__uint16) code); + + if ((avail & codemask) == 0 && avail <= 0x0FFF) { + codesize++; + codemask = (1 << codesize) - 1; + } + + oldcode = code; + } else { + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + } + } + } +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +// two back is the image from two frames ago, used for a very specific disposal format +static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back) +{ + int dispose; + int first_frame; + int pi; + int pcount; + STBI_NOTUSED(req_comp); + + // on first frame, any non-written pixels get the background colour (non-transparent) + first_frame = 0; + if (g->out == 0) { + if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header + if (!stbi__mad3sizes_valid(4, g->w, g->h, 0)) + return stbi__errpuc("too large", "GIF image is too large"); + pcount = g->w * g->h; + g->out = (stbi_uc *) stbi__malloc(4 * pcount); + g->background = (stbi_uc *) stbi__malloc(4 * pcount); + g->history = (stbi_uc *) stbi__malloc(pcount); + if (!g->out || !g->background || !g->history) + return stbi__errpuc("outofmem", "Out of memory"); + + // image is treated as "transparent" at the start - ie, nothing overwrites the current background; + // background colour is only used for pixels that are not rendered first frame, after that "background" + // color refers to the color that was there the previous frame. + memset(g->out, 0x00, 4 * pcount); + memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent) + memset(g->history, 0x00, pcount); // pixels that were affected previous frame + first_frame = 1; + } else { + // second frame - how do we dispose of the previous one? + dispose = (g->eflags & 0x1C) >> 2; + pcount = g->w * g->h; + + if ((dispose == 3) && (two_back == 0)) { + dispose = 2; // if I don't have an image to revert back to, default to the old background + } + + if (dispose == 3) { // use previous graphic + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi]) { + memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 ); + } + } + } else if (dispose == 2) { + // restore what was changed last frame to background before that frame; + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi]) { + memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 ); + } + } + } else { + // This is a non-disposal case eithe way, so just + // leave the pixels as is, and they will become the new background + // 1: do not dispose + // 0: not specified. + } + + // background is what out is after the undoing of the previou frame; + memcpy( g->background, g->out, 4 * g->w * g->h ); + } + + // clear my history; + memset( g->history, 0x00, g->w * g->h ); // pixels that were affected previous frame + + for (;;) { + int tag = stbi__get8(s); + switch (tag) { + case 0x2C: /* Image Descriptor */ + { + stbi__int32 x, y, w, h; + stbi_uc *o; + + x = stbi__get16le(s); + y = stbi__get16le(s); + w = stbi__get16le(s); + h = stbi__get16le(s); + if (((x + w) > (g->w)) || ((y + h) > (g->h))) + return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); + + g->line_size = g->w * 4; + g->start_x = x * 4; + g->start_y = y * g->line_size; + g->max_x = g->start_x + w * 4; + g->max_y = g->start_y + h * g->line_size; + g->cur_x = g->start_x; + g->cur_y = g->start_y; + + // if the width of the specified rectangle is 0, that means + // we may not see *any* pixels or the image is malformed; + // to make sure this is caught, move the current y down to + // max_y (which is what out_gif_code checks). + if (w == 0) + g->cur_y = g->max_y; + + g->lflags = stbi__get8(s); + + if (g->lflags & 0x40) { + g->step = 8 * g->line_size; // first interlaced spacing + g->parse = 3; + } else { + g->step = g->line_size; + g->parse = 0; + } + + if (g->lflags & 0x80) { + stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); + g->color_table = (stbi_uc *) g->lpal; + } else if (g->flags & 0x80) { + g->color_table = (stbi_uc *) g->pal; + } else + return stbi__errpuc("missing color table", "Corrupt GIF"); + + o = stbi__process_gif_raster(s, g); + if (!o) return NULL; + + // if this was the first frame, + pcount = g->w * g->h; + if (first_frame && (g->bgindex > 0)) { + // if first frame, any pixel not drawn to gets the background color + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi] == 0) { + g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be; + memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 ); + } + } + } + + return o; + } + + case 0x21: // Comment Extension. + { + int len; + int ext = stbi__get8(s); + if (ext == 0xF9) { // Graphic Control Extension. + len = stbi__get8(s); + if (len == 4) { + g->eflags = stbi__get8(s); + g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths. + + // unset old transparent + if (g->transparent >= 0) { + g->pal[g->transparent][3] = 255; + } + if (g->eflags & 0x01) { + g->transparent = stbi__get8(s); + if (g->transparent >= 0) { + g->pal[g->transparent][3] = 0; + } + } else { + // don't need transparent + stbi__skip(s, 1); + g->transparent = -1; + } + } else { + stbi__skip(s, len); + break; + } + } + while ((len = stbi__get8(s)) != 0) { + stbi__skip(s, len); + } + break; + } + + case 0x3B: // gif stream termination code + return (stbi_uc *) s; // using '1' causes warning on some compilers + + default: + return stbi__errpuc("unknown code", "Corrupt GIF"); + } + } +} + +static void *stbi__load_gif_main_outofmem(stbi__gif *g, stbi_uc *out, int **delays) +{ + STBI_FREE(g->out); + STBI_FREE(g->history); + STBI_FREE(g->background); + + if (out) STBI_FREE(out); + if (delays && *delays) STBI_FREE(*delays); + return stbi__errpuc("outofmem", "Out of memory"); +} + +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ + if (stbi__gif_test(s)) { + int layers = 0; + stbi_uc *u = 0; + stbi_uc *out = 0; + stbi_uc *two_back = 0; + stbi__gif g; + int stride; + int out_size = 0; + int delays_size = 0; + + STBI_NOTUSED(out_size); + STBI_NOTUSED(delays_size); + + memset(&g, 0, sizeof(g)); + if (delays) { + *delays = 0; + } + + do { + u = stbi__gif_load_next(s, &g, comp, req_comp, two_back); + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + + if (u) { + *x = g.w; + *y = g.h; + ++layers; + stride = g.w * g.h * 4; + + if (out) { + void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, out_size, layers * stride ); + if (!tmp) + return stbi__load_gif_main_outofmem(&g, out, delays); + else { + out = (stbi_uc*) tmp; + out_size = layers * stride; + } + + if (delays) { + int *new_delays = (int*) STBI_REALLOC_SIZED( *delays, delays_size, sizeof(int) * layers ); + if (!new_delays) + return stbi__load_gif_main_outofmem(&g, out, delays); + *delays = new_delays; + delays_size = layers * sizeof(int); + } + } else { + out = (stbi_uc*)stbi__malloc( layers * stride ); + if (!out) + return stbi__load_gif_main_outofmem(&g, out, delays); + out_size = layers * stride; + if (delays) { + *delays = (int*) stbi__malloc( layers * sizeof(int) ); + if (!*delays) + return stbi__load_gif_main_outofmem(&g, out, delays); + delays_size = layers * sizeof(int); + } + } + memcpy( out + ((layers - 1) * stride), u, stride ); + if (layers >= 2) { + two_back = out - 2 * stride; + } + + if (delays) { + (*delays)[layers - 1U] = g.delay; + } + } + } while (u != 0); + + // free temp buffer; + STBI_FREE(g.out); + STBI_FREE(g.history); + STBI_FREE(g.background); + + // do the final conversion after loading everything; + if (req_comp && req_comp != 4) + out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h); + + *z = layers; + return out; + } else { + return stbi__errpuc("not GIF", "Image was not as a gif type."); + } +} + +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *u = 0; + stbi__gif g; + memset(&g, 0, sizeof(g)); + STBI_NOTUSED(ri); + + u = stbi__gif_load_next(s, &g, comp, req_comp, 0); + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + if (u) { + *x = g.w; + *y = g.h; + + // moved conversion to after successful load so that the same + // can be done for multiple frames. + if (req_comp && req_comp != 4) + u = stbi__convert_format(u, 4, req_comp, g.w, g.h); + } else if (g.out) { + // if there was an error and we allocated an image buffer, free it! + STBI_FREE(g.out); + } + + // free buffers needed for multiple frame loading; + STBI_FREE(g.history); + STBI_FREE(g.background); + + return u; +} + +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) +{ + return stbi__gif_info_raw(s,x,y,comp); +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int stbi__hdr_test_core(stbi__context *s, const char *signature) +{ + int i; + for (i=0; signature[i]; ++i) + if (stbi__get8(s) != signature[i]) + return 0; + stbi__rewind(s); + return 1; +} + +static int stbi__hdr_test(stbi__context* s) +{ + int r = stbi__hdr_test_core(s, "#?RADIANCE\n"); + stbi__rewind(s); + if(!r) { + r = stbi__hdr_test_core(s, "#?RGBE\n"); + stbi__rewind(s); + } + return r; +} + +#define STBI__HDR_BUFLEN 1024 +static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) +{ + int len=0; + char c = '\0'; + + c = (char) stbi__get8(z); + + while (!stbi__at_eof(z) && c != '\n') { + buffer[len++] = c; + if (len == STBI__HDR_BUFLEN-1) { + // flush to end of line + while (!stbi__at_eof(z) && stbi__get8(z) != '\n') + ; + break; + } + c = (char) stbi__get8(z); + } + + buffer[len] = 0; + return buffer; +} + +static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) +{ + if ( input[3] != 0 ) { + float f1; + // Exponent + f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); + if (req_comp <= 2) + output[0] = (input[0] + input[1] + input[2]) * f1 / 3; + else { + output[0] = input[0] * f1; + output[1] = input[1] * f1; + output[2] = input[2] * f1; + } + if (req_comp == 2) output[1] = 1; + if (req_comp == 4) output[3] = 1; + } else { + switch (req_comp) { + case 4: output[3] = 1; /* fallthrough */ + case 3: output[0] = output[1] = output[2] = 0; + break; + case 2: output[1] = 1; /* fallthrough */ + case 1: output[0] = 0; + break; + } + } +} + +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + int width, height; + stbi_uc *scanline; + float *hdr_data; + int len; + unsigned char count, value; + int i, j, k, c1,c2, z; + const char *headerToken; + STBI_NOTUSED(ri); + + // Check identifier + headerToken = stbi__hdr_gettoken(s,buffer); + if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) + return stbi__errpf("not HDR", "Corrupt HDR image"); + + // Parse header + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); + + // Parse width and height + // can't use sscanf() if we're not using stdio! + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + height = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + width = (int) strtol(token, NULL, 10); + + if (height > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); + if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); + + *x = width; + *y = height; + + if (comp) *comp = 3; + if (req_comp == 0) req_comp = 3; + + if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0)) + return stbi__errpf("too large", "HDR image is too large"); + + // Read data + hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0); + if (!hdr_data) + return stbi__errpf("outofmem", "Out of memory"); + + // Load image data + // image data is stored as some number of sca + if ( width < 8 || width >= 32768) { + // Read flat data + for (j=0; j < height; ++j) { + for (i=0; i < width; ++i) { + stbi_uc rgbe[4]; + main_decode_loop: + stbi__getn(s, rgbe, 4); + stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); + } + } + } else { + // Read RLE-encoded data + scanline = NULL; + + for (j = 0; j < height; ++j) { + c1 = stbi__get8(s); + c2 = stbi__get8(s); + len = stbi__get8(s); + if (c1 != 2 || c2 != 2 || (len & 0x80)) { + // not run-length encoded, so we have to actually use THIS data as a decoded + // pixel (note this can't be a valid pixel--one of RGB must be >= 128) + stbi_uc rgbe[4]; + rgbe[0] = (stbi_uc) c1; + rgbe[1] = (stbi_uc) c2; + rgbe[2] = (stbi_uc) len; + rgbe[3] = (stbi_uc) stbi__get8(s); + stbi__hdr_convert(hdr_data, rgbe, req_comp); + i = 1; + j = 0; + STBI_FREE(scanline); + goto main_decode_loop; // yes, this makes no sense + } + len <<= 8; + len |= stbi__get8(s); + if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } + if (scanline == NULL) { + scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0); + if (!scanline) { + STBI_FREE(hdr_data); + return stbi__errpf("outofmem", "Out of memory"); + } + } + + for (k = 0; k < 4; ++k) { + int nleft; + i = 0; + while ((nleft = width - i) > 0) { + count = stbi__get8(s); + if (count > 128) { + // Run + value = stbi__get8(s); + count -= 128; + if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = value; + } else { + // Dump + if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = stbi__get8(s); + } + } + } + for (i=0; i < width; ++i) + stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); + } + if (scanline) + STBI_FREE(scanline); + } + + return hdr_data; +} + +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + int dummy; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + if (stbi__hdr_test(s) == 0) { + stbi__rewind( s ); + return 0; + } + + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) { + stbi__rewind( s ); + return 0; + } + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *y = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *x = (int) strtol(token, NULL, 10); + *comp = 3; + return 1; +} +#endif // STBI_NO_HDR + +#ifndef STBI_NO_BMP +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) +{ + void *p; + stbi__bmp_data info; + + info.all_a = 255; + p = stbi__bmp_parse_header(s, &info); + if (p == NULL) { + stbi__rewind( s ); + return 0; + } + if (x) *x = s->img_x; + if (y) *y = s->img_y; + if (comp) { + if (info.bpp == 24 && info.ma == 0xff000000) + *comp = 3; + else + *comp = info.ma ? 4 : 3; + } + return 1; +} +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) +{ + int channelCount, dummy, depth; + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + if (stbi__get32be(s) != 0x38425053) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 1) { + stbi__rewind( s ); + return 0; + } + stbi__skip(s, 6); + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) { + stbi__rewind( s ); + return 0; + } + *y = stbi__get32be(s); + *x = stbi__get32be(s); + depth = stbi__get16be(s); + if (depth != 8 && depth != 16) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 3) { + stbi__rewind( s ); + return 0; + } + *comp = 4; + return 1; +} + +static int stbi__psd_is16(stbi__context *s) +{ + int channelCount, depth; + if (stbi__get32be(s) != 0x38425053) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 1) { + stbi__rewind( s ); + return 0; + } + stbi__skip(s, 6); + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) { + stbi__rewind( s ); + return 0; + } + STBI_NOTUSED(stbi__get32be(s)); + STBI_NOTUSED(stbi__get32be(s)); + depth = stbi__get16be(s); + if (depth != 16) { + stbi__rewind( s ); + return 0; + } + return 1; +} +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) +{ + int act_comp=0,num_packets=0,chained,dummy; + stbi__pic_packet packets[10]; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { + stbi__rewind(s); + return 0; + } + + stbi__skip(s, 88); + + *x = stbi__get16be(s); + *y = stbi__get16be(s); + if (stbi__at_eof(s)) { + stbi__rewind( s); + return 0; + } + if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { + stbi__rewind( s ); + return 0; + } + + stbi__skip(s, 8); + + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return 0; + + packet = &packets[num_packets++]; + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + act_comp |= packet->channel; + + if (stbi__at_eof(s)) { + stbi__rewind( s ); + return 0; + } + if (packet->size != 8) { + stbi__rewind( s ); + return 0; + } + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); + + return 1; +} +#endif + +// ************************************************************************************************* +// Portable Gray Map and Portable Pixel Map loader +// by Ken Miller +// +// PGM: http://netpbm.sourceforge.net/doc/pgm.html +// PPM: http://netpbm.sourceforge.net/doc/ppm.html +// +// Known limitations: +// Does not support comments in the header section +// Does not support ASCII image data (formats P2 and P3) + +#ifndef STBI_NO_PNM + +static int stbi__pnm_test(stbi__context *s) +{ + char p, t; + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind( s ); + return 0; + } + return 1; +} + +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + STBI_NOTUSED(ri); + + ri->bits_per_channel = stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n); + if (ri->bits_per_channel == 0) + return 0; + + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + *x = s->img_x; + *y = s->img_y; + if (comp) *comp = s->img_n; + + if (!stbi__mad4sizes_valid(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0)) + return stbi__errpuc("too large", "PNM too large"); + + out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) { + STBI_FREE(out); + return stbi__errpuc("bad PNM", "PNM file truncated"); + } + + if (req_comp && req_comp != s->img_n) { + if (ri->bits_per_channel == 16) { + out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, s->img_n, req_comp, s->img_x, s->img_y); + } else { + out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); + } + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + return out; +} + +static int stbi__pnm_isspace(char c) +{ + return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; +} + +static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) +{ + for (;;) { + while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) + *c = (char) stbi__get8(s); + + if (stbi__at_eof(s) || *c != '#') + break; + + while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' ) + *c = (char) stbi__get8(s); + } +} + +static int stbi__pnm_isdigit(char c) +{ + return c >= '0' && c <= '9'; +} + +static int stbi__pnm_getinteger(stbi__context *s, char *c) +{ + int value = 0; + + while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { + value = value*10 + (*c - '0'); + *c = (char) stbi__get8(s); + if((value > 214748364) || (value == 214748364 && *c > '7')) + return stbi__err("integer parse overflow", "Parsing an integer in the PPM header overflowed a 32-bit int"); + } + + return value; +} + +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) +{ + int maxv, dummy; + char c, p, t; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + stbi__rewind(s); + + // Get identifier + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind(s); + return 0; + } + + *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm + + c = (char) stbi__get8(s); + stbi__pnm_skip_whitespace(s, &c); + + *x = stbi__pnm_getinteger(s, &c); // read width + if(*x == 0) + return stbi__err("invalid width", "PPM image header had zero or overflowing width"); + stbi__pnm_skip_whitespace(s, &c); + + *y = stbi__pnm_getinteger(s, &c); // read height + if (*y == 0) + return stbi__err("invalid width", "PPM image header had zero or overflowing width"); + stbi__pnm_skip_whitespace(s, &c); + + maxv = stbi__pnm_getinteger(s, &c); // read max value + if (maxv > 65535) + return stbi__err("max value > 65535", "PPM image supports only 8-bit and 16-bit images"); + else if (maxv > 255) + return 16; + else + return 8; +} + +static int stbi__pnm_is16(stbi__context *s) +{ + if (stbi__pnm_info(s, NULL, NULL, NULL) == 16) + return 1; + return 0; +} +#endif + +static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) +{ + #ifndef STBI_NO_JPEG + if (stbi__jpeg_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNG + if (stbi__png_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_GIF + if (stbi__gif_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_BMP + if (stbi__bmp_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PSD + if (stbi__psd_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PIC + if (stbi__pic_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNM + if (stbi__pnm_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_info(s, x, y, comp)) return 1; + #endif + + // test tga last because it's a crappy test! + #ifndef STBI_NO_TGA + if (stbi__tga_info(s, x, y, comp)) + return 1; + #endif + return stbi__err("unknown image type", "Image not of any known type, or corrupt"); +} + +static int stbi__is_16_main(stbi__context *s) +{ + #ifndef STBI_NO_PNG + if (stbi__png_is16(s)) return 1; + #endif + + #ifndef STBI_NO_PSD + if (stbi__psd_is16(s)) return 1; + #endif + + #ifndef STBI_NO_PNM + if (stbi__pnm_is16(s)) return 1; + #endif + return 0; +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result; + if (!f) return stbi__err("can't fopen", "Unable to open file"); + result = stbi_info_from_file(f, x, y, comp); + fclose(f); + return result; +} + +STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) +{ + int r; + stbi__context s; + long pos = ftell(f); + stbi__start_file(&s, f); + r = stbi__info_main(&s,x,y,comp); + fseek(f,pos,SEEK_SET); + return r; +} + +STBIDEF int stbi_is_16_bit(char const *filename) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result; + if (!f) return stbi__err("can't fopen", "Unable to open file"); + result = stbi_is_16_bit_from_file(f); + fclose(f); + return result; +} + +STBIDEF int stbi_is_16_bit_from_file(FILE *f) +{ + int r; + stbi__context s; + long pos = ftell(f); + stbi__start_file(&s, f); + r = stbi__is_16_main(&s); + fseek(f,pos,SEEK_SET); + return r; +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__is_16_main(&s); +} + +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi__is_16_main(&s); +} + +#endif // STB_IMAGE_IMPLEMENTATION + +/* + revision history: + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug + 1-bit BMP + *_is_16_bit api + avoid warnings + 2.16 (2017-07-23) all functions have 16-bit variants; + STBI_NO_STDIO works again; + compilation fixes; + fix rounding in unpremultiply; + optimize vertical flip; + disable raw_len validation; + documentation fixes + 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; + warning fixes; disable run-time SSE detection on gcc; + uniform handling of optional "return" values; + thread-safe initialization of zlib tables + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) allocate large structures on the stack + remove white matting for transparent PSD + fix reported channel count for PNG & BMP + re-enable SSE2 in non-gcc 64-bit + support RGB-formatted JPEG + read 16-bit PNGs (only as 8-bit) + 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED + 2.09 (2016-01-16) allow comments in PNM files + 16-bit-per-pixel TGA (not bit-per-component) + info() for TGA could break due to .hdr handling + info() for BMP to shares code instead of sloppy parse + can use STBI_REALLOC_SIZED if allocator doesn't support realloc + code cleanup + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA + 2.07 (2015-09-13) fix compiler warnings + partial animated GIF support + limited 16-bpc PSD support + #ifdef unused functions + bug with < 92 byte PIC,PNM,HDR,TGA + 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value + 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning + 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit + 2.03 (2015-04-12) extra corruption checking (mmozeiko) + stbi_set_flip_vertically_on_load (nguillemot) + fix NEON support; fix mingw support + 2.02 (2015-01-19) fix incorrect assert, fix warning + 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 + 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG + 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) + progressive JPEG (stb) + PGM/PPM support (Ken Miller) + STBI_MALLOC,STBI_REALLOC,STBI_FREE + GIF bugfix -- seemingly never worked + STBI_NO_*, STBI_ONLY_* + 1.48 (2014-12-14) fix incorrectly-named assert() + 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) + optimize PNG (ryg) + fix bug in interlaced PNG with user-specified channel count (stb) + 1.46 (2014-08-26) + fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG + 1.45 (2014-08-16) + fix MSVC-ARM internal compiler error by wrapping malloc + 1.44 (2014-08-07) + various warning fixes from Ronny Chevalier + 1.43 (2014-07-15) + fix MSVC-only compiler problem in code changed in 1.42 + 1.42 (2014-07-09) + don't define _CRT_SECURE_NO_WARNINGS (affects user code) + fixes to stbi__cleanup_jpeg path + added STBI_ASSERT to avoid requiring assert.h + 1.41 (2014-06-25) + fix search&replace from 1.36 that messed up comments/error messages + 1.40 (2014-06-22) + fix gcc struct-initialization warning + 1.39 (2014-06-15) + fix to TGA optimization when req_comp != number of components in TGA; + fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) + add support for BMP version 5 (more ignored fields) + 1.38 (2014-06-06) + suppress MSVC warnings on integer casts truncating values + fix accidental rename of 'skip' field of I/O + 1.37 (2014-06-04) + remove duplicate typedef + 1.36 (2014-06-03) + convert to header file single-file library + if de-iphone isn't set, load iphone images color-swapped instead of returning NULL + 1.35 (2014-05-27) + various warnings + fix broken STBI_SIMD path + fix bug where stbi_load_from_file no longer left file pointer in correct place + fix broken non-easy path for 32-bit BMP (possibly never used) + TGA optimization by Arseny Kapoulkine + 1.34 (unknown) + use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case + 1.33 (2011-07-14) + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements + 1.32 (2011-07-13) + support for "info" function for all supported filetypes (SpartanJ) + 1.31 (2011-06-20) + a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) + removed deprecated format-specific test/load functions + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) + fix inefficiency in decoding 32-bit BMP (David Woo) + 1.29 (2010-08-16) + various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) + fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) + cast-to-stbi_uc to fix warnings + 1.26 (2010-07-24) + fix bug in file buffering for PNG reported by SpartanJ + 1.25 (2010-07-17) + refix trans_data warning (Won Chun) + 1.24 (2010-07-12) + perf improvements reading from files on platforms with lock-heavy fgetc() + minor perf improvements for jpeg + deprecated type-specific functions so we'll get feedback if they're needed + attempt to fix trans_data warning (Won Chun) + 1.23 fixed bug in iPhone support + 1.22 (2010-07-10) + removed image *writing* support + stbi_info support from Jetro Lauha + GIF support from Jean-Marc Lienher + iPhone PNG-extensions from James Brown + warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) + 1.21 fix use of 'stbi_uc' in header (reported by jon blow) + 1.20 added support for Softimage PIC, by Tom Seddon + 1.19 bug in interlaced PNG corruption check (found by ryg) + 1.18 (2008-08-02) + fix a threading bug (local mutable static) + 1.17 support interlaced PNG + 1.16 major bugfix - stbi__convert_format converted one too many pixels + 1.15 initialize some fields for thread safety + 1.14 fix threadsafe conversion bug + header-file-only version (#define STBI_HEADER_FILE_ONLY before including) + 1.13 threadsafe + 1.12 const qualifiers in the API + 1.11 Support installable IDCT, colorspace conversion routines + 1.10 Fixes for 64-bit (don't use "unsigned long") + optimized upsampling by Fabian "ryg" Giesen + 1.09 Fix format-conversion for PSD code (bad global variables!) + 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz + 1.07 attempt to fix C++ warning/errors again + 1.06 attempt to fix C++ warning/errors again + 1.05 fix TGA loading to return correct *comp and use good luminance calc + 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free + 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR + 1.02 support for (subset of) HDR files, float interface for preferred access to them + 1.01 fix bug: possible bug in handling right-side up bmps... not sure + fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all + 1.00 interface to zlib that skips zlib header + 0.99 correct handling of alpha in palette + 0.98 TGA loader by lonesock; dynamically add loaders (untested) + 0.97 jpeg errors on too large a file; also catch another malloc failure + 0.96 fix detection of invalid v value - particleman@mollyrocket forum + 0.95 during header scan, seek to markers in case of padding + 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same + 0.93 handle jpegtran output; verbose errors + 0.92 read 4,8,16,24,32-bit BMP files of several formats + 0.91 output 24-bit Windows 3.0 BMP files + 0.90 fix a few more warnings; bump version number to approach 1.0 + 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd + 0.60 fix compiling as c++ + 0.59 fix warnings: merge Dave Moore's -Wall fixes + 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian + 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available + 0.56 fix bug: zlib uncompressed mode len vs. nlen + 0.55 fix bug: restart_interval not initialized to 0 + 0.54 allow NULL for 'int *comp' + 0.53 fix bug in png 3->4; speedup png decoding + 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments + 0.51 obey req_comp requests, 1-component jpegs return as 1-component, + on 'test' only check type, not whether we support this variant + 0.50 (2006-11-19) + first released version +*/ + + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ diff --git a/app/src/main/java/ai/baseweight/baseweightsnap/MainActivity.kt b/app/src/main/java/ai/baseweight/baseweightsnap/MainActivity.kt index 57c9921..adcce82 100644 --- a/app/src/main/java/ai/baseweight/baseweightsnap/MainActivity.kt +++ b/app/src/main/java/ai/baseweight/baseweightsnap/MainActivity.kt @@ -52,7 +52,7 @@ class MainActivity : AppCompatActivity() { private var currentCameraSelector = CameraSelector.DEFAULT_BACK_CAMERA private val scope = CoroutineScope(Dispatchers.Main) private var generationJob: Job? = null - private val vlmRunner: MTMD_Android = MTMD_Android.instance() + private val nanoVLM: NanoVLM_Android = NanoVLM_Android.instance() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) @@ -228,7 +228,7 @@ class MainActivity : AppCompatActivity() { private fun stopGeneration() { generationJob?.cancel() - vlmRunner.stopGeneration() + // NanoVLM doesn't have stopGeneration - generation is synchronous } private fun hideResponseText() { @@ -353,35 +353,33 @@ class MainActivity : AppCompatActivity() { binding.btnDismissResponse.visibility = View.GONE try { - vlmRunner.processImage(bitmap) + // Process image + progressText?.text = "Processing image..." + val imageProcessed = nanoVLM.processImage(bitmap) + + if (!imageProcessed) { + progressDialog.dismiss() + showResponseText("Failed to process image") + return + } + // Generate response Log.d("MainActivity", "Generating response for prompt: $prompt") + progressText?.text = "Generating response..." + progressBar?.isIndeterminate = true + generationJob = scope.launch { - vlmRunner.generateResponse(prompt, 2048).collect { text -> + nanoVLM.generateResponse(prompt, 150).collect { text -> Log.d("MainActivity", "Received text: $text") withContext(Dispatchers.Main) { - if (text.startsWith("PROGRESS:")) { - // Handle progress update - val parts = text.substring(9).split(":") - if (parts.size == 2) { - val (phase, progress) = parts - progressText?.text = phase - progressBar?.progress = progress.toInt() - } - } else { - // Handle generated text - Log.d("MainActivity", "Generated text: $text") - // Show text view and dismiss dialog when we get actual text - progressDialog.dismiss() - binding.responseText.visibility = View.VISIBLE - binding.btnDismissResponse.visibility = View.VISIBLE - if(binding.responseText.text.isEmpty()) { - binding.responseText.text = text - } else { - binding.responseText.append(text) - } - binding.responseText.invalidate() - } + // Handle generated text + Log.d("MainActivity", "Generated text: $text") + // Show text view and dismiss dialog when we get actual text + progressDialog.dismiss() + binding.responseText.visibility = View.VISIBLE + binding.btnDismissResponse.visibility = View.VISIBLE + binding.responseText.text = text + binding.responseText.invalidate() } } } diff --git a/app/src/main/java/ai/baseweight/baseweightsnap/ModelManager.kt b/app/src/main/java/ai/baseweight/baseweightsnap/ModelManager.kt index 7a3b016..ad08d2f 100644 --- a/app/src/main/java/ai/baseweight/baseweightsnap/ModelManager.kt +++ b/app/src/main/java/ai/baseweight/baseweightsnap/ModelManager.kt @@ -12,22 +12,19 @@ import java.io.FileOutputStream import java.net.HttpURLConnection import java.net.URL -data class Model( - val id: String, - val name: String, - val size: Long, // in bytes - val isDefault: Boolean = false, - val isLanguage: Boolean = false +data class ModelFile( + val filename: String, + val size: Long // approximate size in bytes ) -// Container class for MTMD Model pairs -data class MTMDModel( +data class Model( + val id: String, val name: String, - val language: Model, - val vision: Model + val repoUrl: String, + val files: List, + val isDefault: Boolean = false ) { - val languageId: String get() = language.id - val visionId: String get() = vision.id + val totalSize: Long get() = files.sumOf { it.size } } data class DownloadProgress( @@ -35,6 +32,7 @@ data class DownloadProgress( val bytesDownloaded: Long, val totalBytes: Long, val status: DownloadStatus, + val currentFile: String = "", val message: String = "" ) @@ -47,199 +45,312 @@ class ModelManager(private val context: Context) { companion object { private const val TAG = "ModelManager" private const val MODELS_DIR = "models" - const val DEFAULT_MODEL_NAME = "SmolVLM2-256M-VidInstruct" - - // HuggingFace URLs for the models - private const val LANGUAGE_MODEL_URL = "https://huggingface.co/ggml-org/SmolVLM2-256M-Video-Instruct-GGUF/resolve/main/SmolVLM2-256M-Video-Instruct-Q8_0.gguf" - private const val VISION_MODEL_URL = "https://huggingface.co/ggml-org/SmolVLM2-256M-Video-Instruct-GGUF/resolve/main/mmproj-SmolVLM2-256M-Video-Instruct-Q8_0.gguf" + const val DEFAULT_MODEL_NAME = "nanoVLM-230M-8k-executorch" + + // HuggingFace repo for nanoVLM ExecuTorch models (XNNPACK quantized) + private const val NANOVLM_REPO = "https://huggingface.co/infil00p/nanoVLM-230M-8k-executorch/resolve/main/xnnpack" + + // HuggingFace repo for tokenizer + private const val TOKENIZER_REPO = "https://huggingface.co/HuggingFaceTB/SmolLM2-135M-Instruct/resolve/main" } - // List of available models - simplified to just one model pair + // List of available models val availableModels = listOf( - MTMDModel( + Model( + id = "nanovlm-230m-8k", name = DEFAULT_MODEL_NAME, - language = Model( - id = "smolvlm2-256m-language", - name = "SmolVLM", - size = 175_000_000L, // Approximate size in bytes - isDefault = true, - isLanguage = true + repoUrl = NANOVLM_REPO, + files = listOf( + ModelFile("vision_encoder.pte", 88_000_000L), + ModelFile("modality_projector.pte", 6_800_000L), + ModelFile("token_embedding.pte", 109_000_000L), + ModelFile("language_decoder_prefill.pte", 103_000_000L), + ModelFile("language_decoder_decode.pte", 103_000_000L), + ModelFile("lm_head.pte", 109_000_000L), + ModelFile("config.json", 3_200L) ), - vision = Model( - id = "smolvlm2-256m-vision", - name = "SmolVLM", - size = 104_000_000L, // Approximate size in bytes - isDefault = true, - isLanguage = false - ) + isDefault = true ) ) + // Tokenizer files (downloaded separately from different repo) + private val tokenizerFiles = listOf( + ModelFile("tokenizer.json", 800_000L), + ModelFile("tokenizer_config.json", 20_000L) + ) + init { // Create models directory in external storage if it doesn't exist getModelsDirectory().mkdirs() + getTokenizerDirectory().mkdirs() } private fun getModelsDirectory(): File { return File(context.getExternalFilesDir(null), MODELS_DIR) } - // Get MTMD model pair by name - fun getMTMDModel(name: String): MTMDModel? { - return availableModels.find { it.name == name } + private fun getTokenizerDirectory(): File { + return File(context.getExternalFilesDir(null), "tokenizer") } - // Get model by ID - fun getModel(modelId: String): Model? { - return availableModels - .flatMap { listOf(it.language, it.vision) } - .find { it.id == modelId } + // Get model by name + fun getModel(name: String): Model? { + return availableModels.find { it.name == name } } - // Check if a model pair is downloaded - fun isModelPairDownloaded(modelName: String): Boolean { - val model = getMTMDModel(modelName) ?: return false - val languageFile = File(getModelPath(model.languageId)) - val visionFile = File(getModelPath(model.visionId)) - return languageFile.exists() && languageFile.length() > 0 && - visionFile.exists() && visionFile.length() > 0 + // Check if a model is fully downloaded + fun isModelDownloaded(modelName: String): Boolean { + val model = getModel(modelName) ?: return false + val modelsDir = getModelsDirectory() + val tokenizerDir = getTokenizerDirectory() + + // Check all model files exist and have non-zero size + val allModelFilesPresent = model.files.all { modelFile -> + val file = File(modelsDir, modelFile.filename) + file.exists() && file.length() > 0 + } + + // Check tokenizer files exist + val allTokenizerFilesPresent = tokenizerFiles.all { tokenizerFile -> + val file = File(tokenizerDir, tokenizerFile.filename) + file.exists() && file.length() > 0 + } + + return allModelFilesPresent && allTokenizerFilesPresent } - // Get the local path for a model - fun getModelPath(modelId: String): String { - val model = getModel(modelId) ?: throw IllegalArgumentException("Invalid model ID: $modelId") - return "${getModelsDirectory().absolutePath}/${modelId}.gguf" + // Get the local path for the models directory + fun getModelDirectoryPath(): String { + return getModelsDirectory().absolutePath } - // Get the local path for a model object - fun getModelPath(model: Model): String { - return getModelPath(model.id) + // Get the local path for the tokenizer directory + fun getTokenizerPath(): String { + return File(getTokenizerDirectory(), "tokenizer.json").absolutePath } - // Download both language and vision models for a model pair - fun downloadModelPair(modelName: String): Flow = flow { - val mtmdModel = getMTMDModel(modelName) ?: throw IllegalArgumentException("Invalid model name: $modelName") - - // Download language model first - downloadModel(mtmdModel.languageId, LANGUAGE_MODEL_URL).collect { progress -> - // Progress is already emitted by downloadModel - } - - // Download vision model - downloadModel(mtmdModel.visionId, VISION_MODEL_URL).collect { progress -> - // Progress is already emitted by downloadModel - } - - // Verify both files are present before marking as COMPLETED - val languageFile = File(getModelPath(mtmdModel.languageId)) - val visionFile = File(getModelPath(mtmdModel.visionId)) - - val languagePresent = languageFile.exists() - val visionPresent = visionFile.exists() - - val totalSize = mtmdModel.language.size + mtmdModel.vision.size - if (languagePresent && visionPresent) { - emit(DownloadProgress( - progress = 100, - bytesDownloaded = totalSize, - totalBytes = totalSize, - status = DownloadStatus.COMPLETED, - message = "Both models downloaded successfully" - )) - Log.d(TAG, "Both language and vision models downloaded successfully for: $modelName") - } else { - // If either file is missing, clean up and mark as error - if (!languagePresent) languageFile.delete() - if (!visionPresent) visionFile.delete() - + // Download model with all required files + fun downloadModel(modelName: String): Flow = flow { + val model = getModel(modelName) ?: throw IllegalArgumentException("Invalid model name: $modelName") + + val modelsDir = getModelsDirectory() + val tokenizerDir = getTokenizerDirectory() + + // Calculate total size (model files + tokenizer files) + val totalSize = model.totalSize + tokenizerFiles.sumOf { it.size } + var totalDownloaded = 0L + + emit(DownloadProgress( + progress = 0, + bytesDownloaded = 0, + totalBytes = totalSize, + status = DownloadStatus.PENDING, + message = "Preparing to download ${model.files.size + tokenizerFiles.size} files..." + )) + + try { + // Download all model files + for (modelFile in model.files) { + val fileUrl = "${model.repoUrl}/${modelFile.filename}" + val localFile = File(modelsDir, modelFile.filename) + + Log.d(TAG, "Downloading ${modelFile.filename} from $fileUrl") + + downloadFile( + url = fileUrl, + destinationFile = localFile, + expectedSize = modelFile.size + ).collect { fileProgress -> + val overallProgress = ((totalDownloaded + fileProgress.bytesDownloaded) * 100 / totalSize).toInt() + emit(DownloadProgress( + progress = overallProgress, + bytesDownloaded = totalDownloaded + fileProgress.bytesDownloaded, + totalBytes = totalSize, + status = DownloadStatus.DOWNLOADING, + currentFile = modelFile.filename, + message = "Downloading ${modelFile.filename}..." + )) + + // If this file completed, add to total + if (fileProgress.status == DownloadStatus.COMPLETED) { + totalDownloaded += modelFile.size + } + } + } + + // Download tokenizer files + for (tokenizerFile in tokenizerFiles) { + val fileUrl = "${TOKENIZER_REPO}/${tokenizerFile.filename}" + val localFile = File(tokenizerDir, tokenizerFile.filename) + + Log.d(TAG, "Downloading ${tokenizerFile.filename} from $fileUrl") + + downloadFile( + url = fileUrl, + destinationFile = localFile, + expectedSize = tokenizerFile.size + ).collect { fileProgress -> + val overallProgress = ((totalDownloaded + fileProgress.bytesDownloaded) * 100 / totalSize).toInt() + emit(DownloadProgress( + progress = overallProgress, + bytesDownloaded = totalDownloaded + fileProgress.bytesDownloaded, + totalBytes = totalSize, + status = DownloadStatus.DOWNLOADING, + currentFile = tokenizerFile.filename, + message = "Downloading ${tokenizerFile.filename}..." + )) + + // If this file completed, add to total + if (fileProgress.status == DownloadStatus.COMPLETED) { + totalDownloaded += tokenizerFile.size + } + } + } + + // Verify ALL files are present before marking as COMPLETED + val allFilesPresent = model.files.all { modelFile -> + val file = File(modelsDir, modelFile.filename) + file.exists() && file.length() > 0 + } && tokenizerFiles.all { tokenizerFile -> + val file = File(tokenizerDir, tokenizerFile.filename) + file.exists() && file.length() > 0 + } + + if (allFilesPresent) { + emit(DownloadProgress( + progress = 100, + bytesDownloaded = totalSize, + totalBytes = totalSize, + status = DownloadStatus.COMPLETED, + message = "All files downloaded successfully" + )) + Log.d(TAG, "All model and tokenizer files downloaded successfully for: $modelName") + } else { + // If any file is missing, clean up and mark as error + val missingFiles = mutableListOf() + model.files.forEach { modelFile -> + val file = File(modelsDir, modelFile.filename) + if (!file.exists() || file.length() == 0L) { + missingFiles.add(modelFile.filename) + file.delete() + } + } + tokenizerFiles.forEach { tokenizerFile -> + val file = File(tokenizerDir, tokenizerFile.filename) + if (!file.exists() || file.length() == 0L) { + missingFiles.add(tokenizerFile.filename) + file.delete() + } + } + + emit(DownloadProgress( + progress = 100, + bytesDownloaded = totalSize, + totalBytes = totalSize, + status = DownloadStatus.ERROR, + message = "Failed to verify files: ${missingFiles.joinToString(", ")}" + )) + Log.e(TAG, "Missing files after download: ${missingFiles.joinToString(", ")}") + } + + } catch (e: Exception) { + Log.e(TAG, "Error downloading model: ${e.message}", e) emit(DownloadProgress( - progress = 100, - bytesDownloaded = totalSize, + progress = 0, + bytesDownloaded = 0, totalBytes = totalSize, status = DownloadStatus.ERROR, - message = "Failed to verify downloaded files" + message = e.message ?: "Unknown error" )) - Log.e(TAG, "Failed to verify downloaded files for: $modelName. Language: $languagePresent, Vision: $visionPresent") } }.flowOn(Dispatchers.IO) - // Download a single model - private fun downloadModel(modelId: String, downloadUrl: String): Flow = flow { - val model = getModel(modelId) ?: throw IllegalArgumentException("Invalid model ID") - val modelFile = File(getModelPath(model)) - + // Download a single file + private fun downloadFile( + url: String, + destinationFile: File, + expectedSize: Long + ): Flow = flow { // Create parent directories if they don't exist - modelFile.parentFile?.mkdirs() + destinationFile.parentFile?.mkdirs() try { - emit(DownloadProgress(0, 0, model.size, DownloadStatus.PENDING, "Connecting to download server...")) - - val downloadConnection = URL(downloadUrl).openConnection() as HttpURLConnection + emit(DownloadProgress(0, 0, expectedSize, DownloadStatus.PENDING, message = "Connecting...")) + + val downloadConnection = URL(url).openConnection() as HttpURLConnection downloadConnection.connect() - + val statusCode = downloadConnection.responseCode if (statusCode != HttpURLConnection.HTTP_OK) { val errorStream = downloadConnection.errorStream val errorMessage = errorStream?.bufferedReader()?.use { it.readText() } ?: "No error message available" val errorDetails = "HTTP ${statusCode} - ${downloadConnection.responseMessage}\n${errorMessage}" - Log.e(TAG, "Download Error: $errorDetails") - + Log.e(TAG, "Download Error for ${destinationFile.name}: $errorDetails") + emit(DownloadProgress( progress = 0, bytesDownloaded = 0, - totalBytes = model.size, + totalBytes = expectedSize, status = DownloadStatus.ERROR, message = "Download failed: $errorDetails" )) - + throw Exception("Download failed with HTTP ${statusCode}: ${downloadConnection.responseMessage}") } - + val totalSize = downloadConnection.contentLength.toLong() - if (totalSize <= 0) { - Log.e(TAG, "Invalid content length received: $totalSize") - throw Exception("Invalid content length received from server") + + // For small files (like JSON), HuggingFace may return -1 for contentLength + // In this case, use expectedSize as estimate and don't fail + val effectiveSize = if (totalSize <= 0) { + Log.w(TAG, "Content length not provided for ${destinationFile.name}, using expected size: $expectedSize") + expectedSize + } else { + Log.d(TAG, "Download size for ${destinationFile.name}: $totalSize bytes") + totalSize } - Log.d(TAG, "Download size: $totalSize bytes") - + val inputStream = downloadConnection.inputStream - val outputStream = FileOutputStream(modelFile) + val outputStream = FileOutputStream(destinationFile) val buffer = ByteArray(8192) var bytesRead: Int var downloadedSize: Long = 0 - - emit(DownloadProgress(0, 0, totalSize, DownloadStatus.DOWNLOADING)) - + + emit(DownloadProgress(0, 0, effectiveSize, DownloadStatus.DOWNLOADING)) + while (true) { bytesRead = inputStream.read(buffer) if (bytesRead == -1) break - + outputStream.write(buffer, 0, bytesRead) downloadedSize += bytesRead - - val progress = (downloadedSize * 100 / totalSize).toInt() - emit(DownloadProgress(progress, downloadedSize, totalSize, DownloadStatus.DOWNLOADING)) + + val progress = (downloadedSize * 100 / effectiveSize).toInt().coerceIn(0, 100) + emit(DownloadProgress(progress, downloadedSize, effectiveSize, DownloadStatus.DOWNLOADING)) } - + outputStream.flush() outputStream.close() inputStream.close() - - val finalFileSize = modelFile.length() - if (finalFileSize != totalSize) { - Log.e(TAG, "Downloaded file size mismatch: Expected $totalSize, got $finalFileSize") - modelFile.delete() + + val finalFileSize = destinationFile.length() + + // Only validate file size if we got a valid contentLength from server + if (totalSize > 0 && finalFileSize != totalSize) { + Log.e(TAG, "Downloaded file size mismatch for ${destinationFile.name}: Expected $totalSize, got $finalFileSize") + destinationFile.delete() throw Exception("Download failed: File size mismatch") } - - emit(DownloadProgress(100, totalSize, totalSize, DownloadStatus.COMPLETED)) - + + Log.d(TAG, "Successfully downloaded ${destinationFile.name}: $finalFileSize bytes") + emit(DownloadProgress(100, finalFileSize, finalFileSize, DownloadStatus.COMPLETED)) + } catch (e: Exception) { - Log.e(TAG, "Error downloading model: ${e.message}", e) - emit(DownloadProgress(0, 0, model.size, DownloadStatus.ERROR, e.message ?: "Unknown error")) - if (modelFile.exists()) { - modelFile.delete() + Log.e(TAG, "Error downloading file ${destinationFile.name}: ${e.message}", e) + emit(DownloadProgress(0, 0, expectedSize, DownloadStatus.ERROR, message = e.message ?: "Unknown error")) + if (destinationFile.exists()) { + destinationFile.delete() } } }.flowOn(Dispatchers.IO) -} \ No newline at end of file +} diff --git a/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt b/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt new file mode 100644 index 0000000..b7b341e --- /dev/null +++ b/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt @@ -0,0 +1,156 @@ +package ai.baseweight.baseweightsnap + +import android.graphics.Bitmap +import android.util.Log +import kotlinx.coroutines.CoroutineDispatcher +import kotlinx.coroutines.asCoroutineDispatcher +import kotlinx.coroutines.cancel +import kotlinx.coroutines.channels.awaitClose +import kotlinx.coroutines.channels.onFailure +import kotlinx.coroutines.flow.Flow +import kotlinx.coroutines.flow.callbackFlow +import kotlinx.coroutines.withContext +import java.nio.ByteBuffer +import java.util.concurrent.Executors +import kotlin.concurrent.thread + +class NanoVLM_Android { + private val tag: String? = this::class.simpleName + + private val runLoop: CoroutineDispatcher = Executors.newSingleThreadExecutor { + thread(start = false, name = "NanoVLM-RunLoop") { + Log.d(tag, "Dedicated thread for NanoVLM native code: ${Thread.currentThread().name}") + + // No-op if called more than once. + System.loadLibrary("baseweightsnap") + + Log.d(tag, "NanoVLM native library loaded") + + it.run() + }.apply { + uncaughtExceptionHandler = Thread.UncaughtExceptionHandler { _, exception: Throwable -> + Log.e(tag, "Unhandled exception in NanoVLM thread", exception) + } + } + }.asCoroutineDispatcher() + + // JNI native methods matching nanovlm_android.cpp exports + private external fun nativeLoadModels(modelDirPath: String, tokenizerPath: String): Boolean + private external fun nativeProcessImageFromBuffer(buffer: ByteBuffer, width: Int, height: Int): Boolean + private external fun nativeGenerateResponse(prompt: String, maxTokens: Int): String + private external fun nativeFreeModels() + + /** + * Load all ExecuTorch models and tokenizer + * @param modelDirPath Directory containing .pte model files + * @param tokenizerPath Path to tokenizer.json + * @return true if all models loaded successfully + */ + suspend fun loadModels(modelDirPath: String, tokenizerPath: String): Boolean { + return withContext(runLoop) { + Log.d(tag, "Loading NanoVLM models from: $modelDirPath") + Log.d(tag, "Loading tokenizer from: $tokenizerPath") + val success = nativeLoadModels(modelDirPath, tokenizerPath) + if (success) { + Log.d(tag, "NanoVLM models loaded successfully") + } else { + Log.e(tag, "Failed to load NanoVLM models") + } + success + } + } + + /** + * Unload all models and free memory + */ + suspend fun unloadModels() { + withContext(runLoop) { + Log.d(tag, "Unloading NanoVLM models") + nativeFreeModels() + } + } + + /** + * Process an image from Android Bitmap + * Converts to ARGB8888 buffer and passes to native code + * @param bitmap Input image + * @return true if image processed successfully + */ + fun processImage(bitmap: Bitmap): Boolean { + // Ensure bitmap is in ARGB_8888 format + val config = if (bitmap.config == Bitmap.Config.ARGB_8888) { + bitmap + } else { + bitmap.copy(Bitmap.Config.ARGB_8888, false) + } + + val byteBuffer = ByteBuffer.allocateDirect(config.byteCount) + config.copyPixelsToBuffer(byteBuffer) + byteBuffer.rewind() + + Log.d(tag, "Processing image: ${config.width}x${config.height}") + val success = nativeProcessImageFromBuffer(byteBuffer, config.width, config.height) + if (success) { + Log.d(tag, "Image processed successfully") + } else { + Log.e(tag, "Failed to process image") + } + return success + } + + /** + * Generate text response for a prompt with the current image context + * Returns a Flow that emits generated tokens as they're produced + * @param prompt Text prompt for the model + * @param maxTokens Maximum number of tokens to generate + * @return Flow of generated text tokens + */ + fun generateResponse(prompt: String, maxTokens: Int = 100): Flow = callbackFlow { + withContext(runLoop) { + try { + Log.d(tag, "Generating response for prompt: '$prompt' (max $maxTokens tokens)") + + // ExecuTorch inference is synchronous, so we generate and send the full response + val response = nativeGenerateResponse(prompt, maxTokens) + + Log.d(tag, "Generation complete. Response length: ${response.length}") + + // Send the full response + trySend(response).onFailure { exception: Throwable? -> + Log.e(tag, "Failed to send response to flow", exception) + close(exception) + } + + // Mark generation as complete + close() + + } catch (e: Exception) { + Log.e(tag, "Exception in generateResponse", e) + cancel("Error: ${e.message}", e) + } + } + + awaitClose { + Log.d(tag, "Generation flow closed") + } + } + + /** + * Check if models are loaded + * Note: This is a simple check - you might want to add a native method for this + */ + var isLoaded: Boolean = false + private set + + suspend fun setLoaded(loaded: Boolean) { + withContext(runLoop) { + isLoaded = loaded + } + } + + companion object { + // Enforce only one instance of NanoVLM_Android (singleton) + private val _instance: NanoVLM_Android = NanoVLM_Android() + fun instance(): NanoVLM_Android = _instance + } +} diff --git a/app/src/main/java/ai/baseweight/baseweightsnap/SplashActivity.kt b/app/src/main/java/ai/baseweight/baseweightsnap/SplashActivity.kt index 235569b..5e409b5 100644 --- a/app/src/main/java/ai/baseweight/baseweightsnap/SplashActivity.kt +++ b/app/src/main/java/ai/baseweight/baseweightsnap/SplashActivity.kt @@ -23,7 +23,7 @@ import java.io.File class SplashActivity : AppCompatActivity() { private lateinit var binding: ActivitySplashBinding private val scope = CoroutineScope(Dispatchers.Main) - private val vlmRunner: MTMD_Android = MTMD_Android.instance() + private val nanoVLM: NanoVLM_Android = NanoVLM_Android.instance() private val modelManager: ModelManager by lazy { ModelManager(this) } private val DEFAULT_ERROR_MESSAGE = "An unexpected error occurred. Please try reinstalling the app." @@ -31,13 +31,13 @@ class SplashActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) - + // Set full screen window.setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN ) - + binding = ActivitySplashBinding.inflate(layoutInflater) setContentView(binding.root) @@ -50,7 +50,7 @@ class SplashActivity : AppCompatActivity() { try { // Check if models are already downloaded val defaultModelName = ModelManager.DEFAULT_MODEL_NAME - val modelsDownloaded = modelManager.isModelPairDownloaded(defaultModelName) + val modelsDownloaded = modelManager.isModelDownloaded(defaultModelName) if (modelsDownloaded) { binding.splashStatus.text = "Loading models..." @@ -79,31 +79,48 @@ class SplashActivity : AppCompatActivity() { private suspend fun downloadAndLoadModels() { binding.splashStatus.text = "Downloading models..." + binding.splashProgress.visibility = View.VISIBLE + try { - modelManager.downloadModelPair(ModelManager.DEFAULT_MODEL_NAME) + modelManager.downloadModel(ModelManager.DEFAULT_MODEL_NAME) .collect { progress -> - binding.splashStatus.text = "Downloading: ${progress.progress}%" - if (progress.status == DownloadStatus.COMPLETED) { - // Download is complete, load the models - val model = modelManager.getMTMDModel(ModelManager.DEFAULT_MODEL_NAME)!! - val languagePath = modelManager.getModelPath(model.languageId) - val visionPath = modelManager.getModelPath(model.visionId) - - if (File(languagePath).exists() && File(visionPath).exists()) { - if (loadModels()) { - delay(500) - startMainActivity() + // Update progress UI + binding.splashProgress.progress = progress.progress + + when (progress.status) { + DownloadStatus.PENDING -> { + binding.splashStatus.text = progress.message + } + DownloadStatus.DOWNLOADING -> { + binding.splashStatus.text = "Downloading ${progress.currentFile}: ${progress.progress}%" + } + DownloadStatus.COMPLETED -> { + // All files downloaded successfully + binding.splashStatus.text = "Download complete! Loading models..." + binding.splashProgress.visibility = View.GONE + + // Verify all files exist + if (modelManager.isModelDownloaded(ModelManager.DEFAULT_MODEL_NAME)) { + if (loadModels()) { + delay(500) + startMainActivity() + } else { + showErrorAndExit("Failed to load models after download. Please try reinstalling the app.") + } } else { - showErrorAndExit("Failed to load models after download. Please try reinstalling the app.") + showErrorAndExit("Download verification failed: Some model files are missing. Please try reinstalling the app.") } - } else { - showErrorAndExit("Download failed: Model files not found. Please try reinstalling the app.") + } + DownloadStatus.ERROR -> { + binding.splashProgress.visibility = View.GONE + showErrorAndExit("Download failed: ${progress.message}") } } } } catch (e: Exception) { val errorMessage = e.message ?: DEFAULT_ERROR_MESSAGE Log.e(TAG, "Error downloading models: $errorMessage", e) + binding.splashProgress.visibility = View.GONE showErrorAndExit("Error downloading models: $errorMessage") } } @@ -112,7 +129,7 @@ class SplashActivity : AppCompatActivity() { scope.launch(Dispatchers.Main) { // Log the error Log.e(TAG, message) - + // Show error dialog AlertDialog.Builder(this@SplashActivity) .setTitle("Error") @@ -130,7 +147,7 @@ class SplashActivity : AppCompatActivity() { private fun showWiFiWarningDialog() { AlertDialog.Builder(this) .setTitle("Large File Download Warning") - .setMessage("These are large files (total ~2.4GB). Please connect to WiFi for the best experience.\n\nWould you like to continue downloading anyway?") + .setMessage("These are large files (total ~520MB). Please connect to WiFi for the best experience.\n\nWould you like to continue downloading anyway?") .setPositiveButton("Continue") { _, _ -> scope.launch { downloadAndLoadModels() @@ -153,23 +170,36 @@ class SplashActivity : AppCompatActivity() { private suspend fun loadModels(): Boolean { return withContext(Dispatchers.IO) { try { - val model = modelManager.getMTMDModel(ModelManager.DEFAULT_MODEL_NAME)!! - val modelPath = modelManager.getModelPath(model.languageId) - val visionPath = modelManager.getModelPath(model.visionId) - - // Verify files exist before loading - if (!File(modelPath).exists() || !File(visionPath).exists()) { - Log.e(TAG, "Model files not found: $modelPath or $visionPath") + val modelDirPath = modelManager.getModelDirectoryPath() + val tokenizerPath = modelManager.getTokenizerPath() + + Log.d(TAG, "Loading models from: $modelDirPath") + Log.d(TAG, "Loading tokenizer from: $tokenizerPath") + + // Verify model directory exists + val modelDir = File(modelDirPath) + if (!modelDir.exists() || !modelDir.isDirectory) { + Log.e(TAG, "Model directory not found: $modelDirPath") return@withContext false } - + + // Verify tokenizer file exists + val tokenizerFile = File(tokenizerPath) + if (!tokenizerFile.exists()) { + Log.e(TAG, "Tokenizer file not found: $tokenizerPath") + return@withContext false + } + // Load the models - val success = vlmRunner.loadModels(modelPath, visionPath) - - if (!success) { - Log.e(TAG, "Failed to load models from: $modelPath and $visionPath") + val success = nanoVLM.loadModels(modelDirPath, tokenizerPath) + + if (success) { + nanoVLM.setLoaded(true) + Log.d(TAG, "Successfully loaded NanoVLM models") + } else { + Log.e(TAG, "Failed to load NanoVLM models") } - + success } catch (e: Exception) { Log.e(TAG, "Error loading models: ${e.message}", e) @@ -183,4 +213,11 @@ class SplashActivity : AppCompatActivity() { startActivity(intent) finish() } -} \ No newline at end of file + + override fun onDestroy() { + super.onDestroy() + 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= "nanovlm_preprocessor" +crate-type = ["cdylib", "staticlib"] + +[dependencies] +tokenizers = { version = "0.21", default-features = false, features = ["onig"] } +image = { version = "0.25", default-features = false, features = ["png", "jpeg"] } +serde_json = "1.0" +fast_image_resize = "5.1.4" + +[dev-dependencies] +ndarray = "0.16" +ndarray-npy = "0.9" + +[profile.release] +opt-level = 3 +lto = true +codegen-units = 1 diff --git a/rust-tokenizer/include/nanovlm_preprocessor.h b/rust-tokenizer/include/nanovlm_preprocessor.h new file mode 100644 index 0000000..345dc3d --- /dev/null +++ b/rust-tokenizer/include/nanovlm_preprocessor.h @@ -0,0 +1,102 @@ +#ifndef NANOVLM_PREPROCESSOR_H +#define NANOVLM_PREPROCESSOR_H + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +// Opaque handle to tokenizer +typedef struct TokenizerHandle TokenizerHandle; + +// Tokenization result structure +typedef struct { + int64_t* token_ids; + size_t num_tokens; + size_t* image_token_positions; + size_t num_image_tokens; +} TokenizationResult; + +// Image data structure +typedef struct { + float* data; + size_t width; + size_t height; + size_t channels; +} ImageData; + +// Multiple images with grid info +typedef struct { + ImageData* images; + size_t num_images; + size_t grid_h; + size_t grid_w; +} MultiImageData; + +// Load a tokenizer from JSON file +// Returns NULL on failure +TokenizerHandle* nanovlm_load_tokenizer( + const char* tokenizer_path, + const char* image_token +); + +// Free tokenizer handle +void nanovlm_free_tokenizer(TokenizerHandle* handle); + +// Tokenize text with image token placeholders +// image_token_length: how many times to repeat the image token +// Caller must free result with nanovlm_free_tokenization_result +TokenizationResult nanovlm_tokenize( + TokenizerHandle* handle, + const char* text, + size_t image_token_length +); + +// Free tokenization result +void nanovlm_free_tokenization_result(TokenizationResult result); + +// Preprocess image to CHW format normalized to [0, 1] +// Returns image data in CHW layout (channels, height, width) +// Caller must free result with nanovlm_free_image_data +ImageData nanovlm_preprocess_image( + const char* image_path, + size_t target_size +); + +// Preprocess image with splitting (global + patches) +// max_side_len: max dimension (e.g., 2048) +// patch_size: size of each patch (e.g., 512) +// resize_to_max: if true, resize to exactly max_side_len; if false, don't upscale +// Returns multiple images: [global_view, patch_0_0, patch_0_1, ...] +// Caller must free result with nanovlm_free_multi_image_data +MultiImageData nanovlm_preprocess_image_with_splitting( + const char* image_path, + size_t max_side_len, + size_t patch_size, + int resize_to_max +); + +// Free image data +void nanovlm_free_image_data(ImageData image_data); + +// Free multiple image data +void nanovlm_free_multi_image_data(MultiImageData multi_image_data); + +// Decode token IDs back to text +// Returns newly allocated C string that must be freed with nanovlm_free_string +char* nanovlm_decode( + TokenizerHandle* handle, + const int64_t* token_ids, + size_t num_tokens +); + +// Free string returned by nanovlm_decode +void nanovlm_free_string(char* str); + +#ifdef __cplusplus +} +#endif + +#endif // NANOVLM_PREPROCESSOR_H diff --git a/rust-tokenizer/src/lib.rs b/rust-tokenizer/src/lib.rs new file mode 100644 index 0000000..d08aa09 --- /dev/null +++ b/rust-tokenizer/src/lib.rs @@ -0,0 +1,759 @@ +use image::ImageReader; +use std::ffi::{CStr, CString}; +use std::os::raw::{c_char, c_float}; +use std::ptr; +use tokenizers::Tokenizer; +use fast_image_resize::images::Image; + +/// Opaque handle to a tokenizer +pub struct TokenizerHandle { + tokenizer: Tokenizer, + image_token_id: u32, + image_token: String, +} + +/// C-compatible struct for returning tokenization results +#[repr(C)] +pub struct TokenizationResult { + pub token_ids: *mut i64, + pub num_tokens: usize, + pub image_token_positions: *mut usize, + pub num_image_tokens: usize, +} + +/// C-compatible struct for returning image data +#[repr(C)] +pub struct ImageData { + pub data: *mut c_float, + pub width: usize, + pub height: usize, + pub channels: usize, +} + +/// C-compatible struct for returning multiple images with grid info +#[repr(C)] +pub struct MultiImageData { + pub images: *mut ImageData, + pub num_images: usize, + pub grid_h: usize, + pub grid_w: usize, +} + +/// Load a tokenizer from a JSON file and return an opaque handle +/// +/// # Safety +/// - `tokenizer_path` must be a valid null-terminated C string +/// - `image_token` must be a valid null-terminated C string +/// - Returns null pointer on failure +#[no_mangle] +pub unsafe extern "C" fn nanovlm_load_tokenizer( + tokenizer_path: *const c_char, + image_token: *const c_char, +) -> *mut TokenizerHandle { + if tokenizer_path.is_null() || image_token.is_null() { + return ptr::null_mut(); + } + + let path_cstr = unsafe { CStr::from_ptr(tokenizer_path) }; + let path = match path_cstr.to_str() { + Ok(s) => s, + Err(_) => return ptr::null_mut(), + }; + + let image_token_cstr = unsafe { CStr::from_ptr(image_token) }; + let img_token = match image_token_cstr.to_str() { + Ok(s) => s.to_string(), + Err(_) => return ptr::null_mut(), + }; + + let mut tokenizer = match Tokenizer::from_file(path) { + Ok(t) => t, + Err(_) => return ptr::null_mut(), + }; + + // Add the image token as a special token (like Python's extra_special_tokens) + use tokenizers::AddedToken; + + // Add tokens in same order as Python to get consistent token IDs + // Python's vlm_extra_tokens dict has keys: image_token, global_image_token, r1c1, r1c2, ... + let mut special_tokens = vec![ + // First: main image token + AddedToken::from(img_token.clone(), true), + // Second: global image token + AddedToken::from("<|global_image|>".to_string(), true), + ]; + + // Third: all row/col tokens (8x8 grid max) + for row in 1..=8 { + for col in 1..=8 { + let token = format!("", row, col); + special_tokens.push(AddedToken::from(token, true)); + } + } + + tokenizer.add_special_tokens(&special_tokens); + + // Now get the ID of the image token + let image_token_id = match tokenizer.token_to_id(&img_token) { + Some(id) => id, + None => return ptr::null_mut(), + }; + + let handle = Box::new(TokenizerHandle { + tokenizer, + image_token_id, + image_token: img_token, + }); + + Box::into_raw(handle) +} + +/// Free a tokenizer handle +/// +/// # Safety +/// - `handle` must be a valid pointer returned by `nanovlm_load_tokenizer` +/// - After calling this, the handle must not be used again +#[no_mangle] +pub unsafe extern "C" fn nanovlm_free_tokenizer(handle: *mut TokenizerHandle) { + if !handle.is_null() { + let _ = unsafe { Box::from_raw(handle) }; + } +} + +/// Tokenize text with image token placeholders +/// +/// # Safety +/// - `handle` must be a valid tokenizer handle +/// - `text` must be a valid null-terminated C string +/// - `image_token_length` specifies how many times to repeat the image token +/// - Caller must free the result using `nanovlm_free_tokenization_result` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_tokenize( + handle: *mut TokenizerHandle, + text: *const c_char, + image_token_length: usize, +) -> TokenizationResult { + if handle.is_null() || text.is_null() { + return TokenizationResult { + token_ids: ptr::null_mut(), + num_tokens: 0, + image_token_positions: ptr::null_mut(), + num_image_tokens: 0, + }; + } + + let tokenizer_handle = unsafe { &*handle }; + let text_cstr = unsafe { CStr::from_ptr(text) }; + let prompt = match text_cstr.to_str() { + Ok(s) => s, + Err(_) => return TokenizationResult { + token_ids: ptr::null_mut(), + num_tokens: 0, + image_token_positions: ptr::null_mut(), + num_image_tokens: 0, + }, + }; + + // Create full prompt with image tokens + let image_tokens_repeated = tokenizer_handle.image_token.repeat(image_token_length); + let full_prompt = format!("{}{}", image_tokens_repeated, prompt); + + // Encode + let encoding = match tokenizer_handle.tokenizer.encode(full_prompt, false) { + Ok(enc) => enc, + Err(_) => return TokenizationResult { + token_ids: ptr::null_mut(), + num_tokens: 0, + image_token_positions: ptr::null_mut(), + num_image_tokens: 0, + }, + }; + + let token_ids = encoding.get_ids(); + + // Find positions for ONLY <|image|> tokens + // Special tokens like <|global_image|> and are context tokens + // that should NOT be replaced with embeddings - they tell the model which patch to expect + let mut image_positions = Vec::new(); + for (idx, &token_id) in token_ids.iter().enumerate() { + if token_id == tokenizer_handle.image_token_id { + image_positions.push(idx); + } + } + + // Convert to i64 for compatibility with ExecuTorch + let token_ids_i64: Vec = token_ids.iter().map(|&id| id as i64).collect(); + let num_tokens = token_ids_i64.len(); + let num_image_tokens = image_positions.len(); + + // Allocate and copy token IDs + let mut token_ids_boxed = token_ids_i64.into_boxed_slice(); + let token_ids_ptr = token_ids_boxed.as_mut_ptr(); + std::mem::forget(token_ids_boxed); + + // Allocate and copy image positions + let mut image_positions_boxed = image_positions.into_boxed_slice(); + let image_positions_ptr = image_positions_boxed.as_mut_ptr(); + std::mem::forget(image_positions_boxed); + + TokenizationResult { + token_ids: token_ids_ptr, + num_tokens, + image_token_positions: image_positions_ptr, + num_image_tokens, + } +} + +/// Free tokenization result +/// +/// # Safety +/// - `result` must be a valid TokenizationResult returned by `nanovlm_tokenize` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_free_tokenization_result(result: TokenizationResult) { + if !result.token_ids.is_null() { + let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(result.token_ids, result.num_tokens)) }; + } + if !result.image_token_positions.is_null() { + let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(result.image_token_positions, result.num_image_tokens)) }; + } +} + +/// Preprocess an image to CHW format (channels, height, width) normalized to [0, 1] +/// +/// # Safety +/// - `image_path` must be a valid null-terminated C string pointing to an image file +/// - `target_size` is the size to resize the image to (square) +/// - Caller must free the result using `nanovlm_free_image_data` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_preprocess_image( + image_path: *const c_char, + target_size: usize, +) -> ImageData { + if image_path.is_null() { + return ImageData { + data: ptr::null_mut(), + width: 0, + height: 0, + channels: 0, + }; + } + + let path_cstr = unsafe { CStr::from_ptr(image_path) }; + let path = match path_cstr.to_str() { + Ok(s) => s, + Err(_) => return ImageData { + data: ptr::null_mut(), + width: 0, + height: 0, + channels: 0, + }, + }; + + // Load and decode image + let img = match ImageReader::open(path) { + Ok(reader) => match reader.decode() { + Ok(img) => img, + Err(_) => return ImageData { + data: ptr::null_mut(), + width: 0, + height: 0, + channels: 0, + }, + }, + Err(_) => return ImageData { + data: ptr::null_mut(), + width: 0, + height: 0, + channels: 0, + }, + }; + + // Resize to target size using CatmullRom (closest to PIL's BICUBIC) + let resized = img.resize_exact( + target_size as u32, + target_size as u32, + image::imageops::FilterType::CatmullRom, + ); + + // Convert to RGB + let rgb = resized.to_rgb8(); + + // Convert to CHW format and normalize to [0, 1] + let channels = 3; + let total_size = channels * target_size * target_size; + let mut data = vec![0.0f32; total_size]; + + for c in 0..channels { + for y in 0..target_size { + for x in 0..target_size { + let pixel = rgb.get_pixel(x as u32, y as u32); + let idx = c * target_size * target_size + y * target_size + x; + data[idx] = pixel[c] as f32 / 255.0; + } + } + } + + let mut data_boxed = data.into_boxed_slice(); + let data_ptr = data_boxed.as_mut_ptr(); + std::mem::forget(data_boxed); + + ImageData { + data: data_ptr, + width: target_size, + height: target_size, + channels, + } +} + +/// Free image data +/// +/// # Safety +/// - `image_data` must be a valid ImageData returned by `nanovlm_preprocess_image` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_free_image_data(image_data: ImageData) { + if !image_data.data.is_null() { + let total_size = image_data.channels * image_data.width * image_data.height; + let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(image_data.data, total_size)) }; + } +} + +/// Preprocess image with dynamic resizing and splitting +/// +/// # Safety +/// - `image_path` must be a valid null-terminated C string +/// - Returns MultiImageData with global view + patches +#[no_mangle] +pub unsafe extern "C" fn nanovlm_preprocess_image_with_splitting( + image_path: *const c_char, + max_side_len: usize, + patch_size: usize, + resize_to_max: i32, +) -> MultiImageData { + if image_path.is_null() { + return MultiImageData { + images: ptr::null_mut(), + num_images: 0, + grid_h: 0, + grid_w: 0, + }; + } + + let path_cstr = unsafe { CStr::from_ptr(image_path) }; + let path = match path_cstr.to_str() { + Ok(s) => s, + Err(_) => return MultiImageData { + images: ptr::null_mut(), + num_images: 0, + grid_h: 0, + grid_w: 0, + }, + }; + + // Load image + let img = match ImageReader::open(path) { + Ok(reader) => match reader.decode() { + Ok(img) => img, + Err(_) => return MultiImageData { + images: ptr::null_mut(), + num_images: 0, + grid_h: 0, + grid_w: 0, + }, + }, + Err(_) => return MultiImageData { + images: ptr::null_mut(), + num_images: 0, + grid_h: 0, + grid_w: 0, + }, + }; + + let (orig_w, orig_h) = (img.width() as usize, img.height() as usize); + + // 1. Dynamic resize + let (new_h, new_w) = compute_dynamic_resize(orig_h, orig_w, max_side_len, patch_size, resize_to_max != 0); + + let resized = img.resize_exact( + new_w as u32, + new_h as u32, + image::imageops::FilterType::CatmullRom, + ); + + // 2. Split into patches + let grid_h = new_h / patch_size; + let grid_w = new_w / patch_size; + let _num_patches = grid_h * grid_w; + + // 3. Create global view + patches (unless only 1 patch) + let mut image_list = Vec::new(); + + if grid_h == 1 && grid_w == 1 { + // Only one patch - don't add global view + let patch = process_image_to_chw(&resized, patch_size, patch_size); + image_list.push(patch); + } else { + // Multiple patches - add global view first using BICUBIC interpolation + // This matches Python's torchvision.transforms.functional.resize with BICUBIC + let global_data = resize_bicubic(&resized, patch_size, patch_size); + image_list.push(global_data); + + // Add all patches + for row in 0..grid_h { + for col in 0..grid_w { + let x = col * patch_size; + let y = row * patch_size; + + let patch = resized.crop_imm(x as u32, y as u32, patch_size as u32, patch_size as u32); + let patch_data = process_image_to_chw(&patch, patch_size, patch_size); + image_list.push(patch_data); + } + } + } + + // Convert to C-compatible format + let num_images = image_list.len(); + let images_vec: Vec = image_list.into_iter().map(|(data, w, h, c)| { + ImageData { + data, + width: w, + height: h, + channels: c, + } + }).collect(); + + let images_boxed = images_vec.into_boxed_slice(); + let images_ptr = Box::into_raw(images_boxed) as *mut ImageData; + + MultiImageData { + images: images_ptr, + num_images, + grid_h, + grid_w, + } +} + +/// Free multiple image data +/// +/// # Safety +/// - `multi_image_data` must be a valid MultiImageData +#[no_mangle] +pub unsafe extern "C" fn nanovlm_free_multi_image_data(multi_image_data: MultiImageData) { + if !multi_image_data.images.is_null() { + let images_slice = unsafe { + std::slice::from_raw_parts_mut(multi_image_data.images, multi_image_data.num_images) + }; + + // Free each image's data + for img in images_slice.iter() { + if !img.data.is_null() { + let total_size = img.channels * img.width * img.height; + let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(img.data, total_size)) }; + } + } + + // Free the images array itself + let _ = unsafe { Box::from_raw(images_slice) }; + } +} + +// Helper function: compute dynamic resize dimensions +fn compute_dynamic_resize(h: usize, w: usize, max_side_len: usize, patch_size: usize, resize_to_max: bool) -> (usize, usize) { + let (long, short) = if w >= h { (w, h) } else { (h, w) }; + + // Target long side + let target_long = if resize_to_max { + max_side_len + } else { + max_side_len.min((long + patch_size - 1) / patch_size * patch_size) + }; + + // Scale factor + let scale = target_long as f64 / long as f64; + + // Compute short side with ceiling to never undershoot + let target_short = ((short as f64 * scale / patch_size as f64).ceil() as usize * patch_size).max(patch_size); + + if w >= h { + (target_short, target_long) + } else { + (target_long, target_short) + } +} + +// Helper function: resize image using bicubic interpolation (matches Python's BICUBIC) +fn resize_bicubic(img: &image::DynamicImage, target_w: usize, target_h: usize) -> (*mut c_float, usize, usize, usize) { + use fast_image_resize as fr; + + let rgb = img.to_rgb8(); + let (src_w, src_h) = rgb.dimensions(); + + // Create source image for fast_image_resize + let src_image = Image::from_vec_u8( + src_w, + src_h, + rgb.into_raw(), + fr::PixelType::U8x3, + ).unwrap(); + + // Create destination image + let mut dst_image = Image::new( + target_w as u32, + target_h as u32, + fr::PixelType::U8x3, + ); + + // Resize with bicubic (CatmullRom) - v5.1.4 API + let mut resizer = fr::Resizer::new(); + resizer.resize( + &src_image, + &mut dst_image, + &fr::ResizeOptions::new().resize_alg(fr::ResizeAlg::Convolution(fr::FilterType::CatmullRom)) + ).unwrap(); + + // Convert to CHW format and normalize to [0, 1] + let channels = 3; + let total_size = channels * target_h * target_w; + let mut chw_data = vec![0.0f32; total_size]; + let dst_buffer = dst_image.buffer(); + + for c in 0..channels { + for y in 0..target_h { + for x in 0..target_w { + let src_idx = (y * target_w + x) * 3 + c; + let dst_idx = c * target_h * target_w + y * target_w + x; + chw_data[dst_idx] = dst_buffer[src_idx] as f32 / 255.0; + } + } + } + + let mut data_boxed = chw_data.into_boxed_slice(); + let data_ptr = data_boxed.as_mut_ptr(); + std::mem::forget(data_boxed); + + (data_ptr, target_w, target_h, channels) +} + +// Helper function: process image to CHW format +fn process_image_to_chw(img: &image::DynamicImage, target_w: usize, target_h: usize) -> (*mut c_float, usize, usize, usize) { + let rgb = img.to_rgb8(); + + let channels = 3; + let total_size = channels * target_h * target_w; + let mut data = vec![0.0f32; total_size]; + + for c in 0..channels { + for y in 0..target_h { + for x in 0..target_w { + let pixel = rgb.get_pixel(x as u32, y as u32); + let idx = c * target_h * target_w + y * target_w + x; + data[idx] = pixel[c] as f32 / 255.0; + } + } + } + + let mut data_boxed = data.into_boxed_slice(); + let data_ptr = data_boxed.as_mut_ptr(); + std::mem::forget(data_boxed); + + (data_ptr, target_w, target_h, channels) +} + +/// Decode token IDs back to text +/// +/// # Safety +/// - `handle` must be a valid tokenizer handle +/// - `token_ids` must be a valid array of `num_tokens` elements +/// - Returns a newly allocated C string that must be freed with `nanovlm_free_string` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_decode( + handle: *mut TokenizerHandle, + token_ids: *const i64, + num_tokens: usize, +) -> *mut c_char { + if handle.is_null() || token_ids.is_null() { + return ptr::null_mut(); + } + + let tokenizer_handle = unsafe { &*handle }; + let ids_slice = unsafe { std::slice::from_raw_parts(token_ids, num_tokens) }; + let ids_u32: Vec = ids_slice.iter().map(|&id| id as u32).collect(); + + let text = match tokenizer_handle.tokenizer.decode(&ids_u32, true) { + Ok(t) => t, + Err(_) => return ptr::null_mut(), + }; + + match CString::new(text) { + Ok(cstr) => cstr.into_raw(), + Err(_) => ptr::null_mut(), + } +} + +/// Free a string returned by nanovlm_decode +/// +/// # Safety +/// - `str` must be a valid pointer returned by `nanovlm_decode` +#[no_mangle] +pub unsafe extern "C" fn nanovlm_free_string(str: *mut c_char) { + if !str.is_null() { + let _ = unsafe { CString::from_raw(str) }; + } +} + +#[cfg(test)] +mod tests { + use super::*; + use ndarray::Array3; + use ndarray_npy::ReadNpyExt; + use std::fs::File; + + #[test] + fn test_image_preprocessing_matches_python() { + // Load Python reference data + let python_tensor_path = "../test_image_tensor.npy"; + let python_tensor_file = File::open(python_tensor_path) + .expect("Failed to open test_image_tensor.npy - run dump_preprocessing_reference.py first"); + let python_tensor: Array3 = Array3::read_npy(python_tensor_file) + .expect("Failed to read numpy array"); + + println!("Python tensor shape: {:?}", python_tensor.shape()); + + // Run Rust preprocessing + let image_path = "../assets/image.png"; + let target_size = 512; + + let image_path_cstr = CString::new(image_path).unwrap(); + let image_data = unsafe { + nanovlm_preprocess_image(image_path_cstr.as_ptr(), target_size) + }; + + assert!(!image_data.data.is_null(), "Image preprocessing failed"); + assert_eq!(image_data.width, target_size); + assert_eq!(image_data.height, target_size); + assert_eq!(image_data.channels, 3); + + // Convert to slice for comparison + let total_size = image_data.channels * image_data.width * image_data.height; + let rust_data = unsafe { + std::slice::from_raw_parts(image_data.data, total_size) + }; + + // Compare against Python output + let python_flat = python_tensor.as_slice().unwrap(); + + let mut max_diff = 0.0f32; + let mut num_mismatches = 0; + let tolerance = 1e-6; + + for (i, (&rust_val, &python_val)) in rust_data.iter().zip(python_flat.iter()).enumerate() { + let diff = (rust_val - python_val).abs(); + if diff > tolerance { + num_mismatches += 1; + if diff > max_diff { + max_diff = diff; + if num_mismatches <= 5 { + println!("Mismatch at index {}: rust={:.6}, python={:.6}, diff={:.6}", + i, rust_val, python_val, diff); + } + } + } + } + + println!("Max difference: {:.6}", max_diff); + println!("Number of mismatches (tolerance={:.6}): {}/{}", tolerance, num_mismatches, total_size); + + // Cleanup + unsafe { nanovlm_free_image_data(image_data); } + + // CatmullRom is close to BICUBIC but not identical - allow up to 2% difference + // This is acceptable for inference (4/255 quantization difference) + assert!(max_diff < 0.02, "Image preprocessing differs from Python by {:.6}", max_diff); + } + + #[test] + fn test_tokenization_matches_python() { + // Load Python reference data + let token_ids_path = "../test_token_ids.npy"; + let token_ids_file = File::open(token_ids_path) + .expect("Failed to open test_token_ids.npy - run dump_preprocessing_reference.py first"); + let python_token_ids: ndarray::Array1 = ndarray::Array1::read_npy(token_ids_file) + .expect("Failed to read token IDs"); + + let positions_path = "../test_image_token_positions.npy"; + let positions_file = File::open(positions_path) + .expect("Failed to open test_image_token_positions.npy"); + let python_positions: ndarray::Array1 = ndarray::Array1::read_npy(positions_file) + .expect("Failed to read positions"); + + println!("Python tokens: {}", python_token_ids.len()); + println!("Python image token positions: {}", python_positions.len()); + + // Run Rust tokenization + let tokenizer_path = "/tmp/tokenizer/tokenizer.json"; + let image_token = "<|image|>"; + let prompt = "What is in this image?"; + let image_token_length = 256; + + let tokenizer_path_cstr = CString::new(tokenizer_path).unwrap(); + let image_token_cstr = CString::new(image_token).unwrap(); + let prompt_cstr = CString::new(prompt).unwrap(); + + let tokenizer_handle = unsafe { + nanovlm_load_tokenizer(tokenizer_path_cstr.as_ptr(), image_token_cstr.as_ptr()) + }; + assert!(!tokenizer_handle.is_null(), "Failed to load tokenizer"); + + let tok_result = unsafe { + nanovlm_tokenize(tokenizer_handle, prompt_cstr.as_ptr(), image_token_length) + }; + + assert!(!tok_result.token_ids.is_null(), "Tokenization failed"); + + // Compare token IDs + let rust_tokens = unsafe { + std::slice::from_raw_parts(tok_result.token_ids, tok_result.num_tokens) + }; + + println!("Rust tokens: {}", rust_tokens.len()); + + assert_eq!(rust_tokens.len(), python_token_ids.len(), + "Token count mismatch: Rust={}, Python={}", + rust_tokens.len(), python_token_ids.len()); + + let mut num_mismatches = 0; + for (i, (&rust_id, &python_id)) in rust_tokens.iter().zip(python_token_ids.iter()).enumerate() { + if rust_id != python_id { + num_mismatches += 1; + if num_mismatches <= 5 { + println!("Token mismatch at index {}: rust={}, python={}", i, rust_id, python_id); + } + } + } + + assert_eq!(num_mismatches, 0, "Found {} token mismatches", num_mismatches); + + // Compare image token positions + let rust_positions = unsafe { + std::slice::from_raw_parts(tok_result.image_token_positions, tok_result.num_image_tokens) + }; + + println!("Rust image token positions: {}", rust_positions.len()); + + assert_eq!(rust_positions.len(), python_positions.len() as usize, + "Image token position count mismatch"); + + for (i, (&rust_pos, &python_pos)) in rust_positions.iter().zip(python_positions.iter()).enumerate() { + assert_eq!(rust_pos, python_pos as usize, + "Position mismatch at index {}: rust={}, python={}", + i, rust_pos, python_pos); + } + + println!("✅ Tokenization matches Python exactly!"); + + // Cleanup + unsafe { + nanovlm_free_tokenization_result(tok_result); + nanovlm_free_tokenizer(tokenizer_handle); + } + } +} From 59e29d238808b8f255026f245a339e4f2d8c8899 Mon Sep 17 00:00:00 2001 From: Joe Bowser Date: Tue, 28 Oct 2025 07:32:03 -0700 Subject: [PATCH 2/2] Still not working, but we should save this --- EXECUTORCH_STATUS.md | 386 ++++++++++++ app/src/main/cpp/CMakeLists.txt | 6 +- app/src/main/cpp/nanovlm_android.cpp | 61 +- .../baseweightsnap/NanoVLM_Android.kt | 36 +- rust-tokenizer/Cargo.lock | 596 +----------------- rust-tokenizer/Cargo.toml | 10 +- rust-tokenizer/src/lib.rs | 522 +-------------- 7 files changed, 497 insertions(+), 1120 deletions(-) create mode 100644 EXECUTORCH_STATUS.md diff --git a/EXECUTORCH_STATUS.md b/EXECUTORCH_STATUS.md new file mode 100644 index 0000000..b8bc69a --- /dev/null +++ b/EXECUTORCH_STATUS.md @@ -0,0 +1,386 @@ +# ExecuTorch nanoVLM Implementation Status + +## ✅ Completed + +### 1. Build System +- **ExecuTorch v1.0.0** built successfully for Android arm64-v8a + - Location: `/Users/bowserj/executorch_repos/executorch/cmake-out-android-arm64-v8a` + - XNNPACK backend enabled with KleidiAI optimizations + - 18 static libraries linked (~130MB total) + - CMake integration complete + +### 2. Rust Tokenizer +- **Cross-compilation** for Android working + - Built for `aarch64-linux-android` target + - NDK toolchain configured in `.cargo/config.toml` + - FFI bindings tested and working + - Library size: 13MB + - Location: `rust-tokenizer/target/aarch64-linux-android/release/libnanovlm_preprocessor.a` + +### 3. Native Library Integration +- **CMakeLists.txt** properly configured + - All ExecuTorch libraries linked with `--whole-archive` for operator registration + - Rust tokenizer linked + - Image preprocessor integrated + - Build produces 9.9MB `libbaseweightsnap.so` + +### 4. Threading Architecture +- **Single-threaded execution** implemented + - Dedicated "NanoVLM-RunLoop" thread created on startup + - All native operations (load models, process image, generate) run on same thread + - Kotlin coroutines with `withContext(runLoop)` for thread safety + - Fixed crash from cross-thread ExecuTorch access + +### 5. Module Loading +- **ExecuTorch v1.0.0 API** correctly implemented + - Explicit `Module::load()` calls after construction + - Using `Module::LoadMode::Mmap` (not `MmapUseMlock` to avoid OOM) + - Error handling with `Error::Ok` checks + - All 6 modules load successfully: + - ✅ Vision encoder (vision_encoder.pte) + - ✅ Modality projector (modality_projector.pte) + - ✅ Prefill decoder (language_decoder_prefill.pte) + - ✅ Decode decoder (language_decoder_decode.pte) + - ✅ Token embedding (token_embedding.pte) + - ✅ LM head (lm_head.pte) + - ✅ Tokenizer (Rust FFI) + +### 6. Application Structure +- **APK builds successfully** + - Debug APK: 25MB + - Native library: 9.9MB (includes ExecuTorch + XNNPACK + Rust) + - Installs and launches without crashes + - Models load in ~150ms + +--- + +## 🚨 Current Blocker: Vision Encoder Freeze + +### Problem +The vision encoder **hangs indefinitely** on the first `forward()` call during image processing: + +``` +10-20 19:58:39.109 I nanovlm-android: Running vision encoder on image 0: shape [1, 3, 512, 512], data range [0.000, 1.000] +[HANGS HERE - no further output] +``` + +**Code location**: `nanovlm_android.cpp:162` +```cpp +auto vision_result = vision_encoder_->forward(vision_inputs); // <- FREEZES +``` + +### What We Know +1. ✅ Models load successfully (no errors) +2. ✅ Image preprocessing completes (17 tiles, 4x4 grid, 512x512) +3. ✅ Input tensor created correctly (shape [1, 3, 512, 512], data range [0.0, 1.0]) +4. ❌ **Freeze happens during ExecuTorch forward pass** +5. ❌ No crash, no error - just infinite hang +6. ❌ Thread doesn't return (verified via logcat) + +### Root Cause Analysis + +The freeze is **NOT** due to: +- ❌ Threading issues (all on single dedicated thread) +- ❌ Memory issues (Mmap mode works, loads succeed) +- ❌ Module loading (all modules load without errors) +- ❌ Input data issues (tensor shape/range correct) + +The freeze is **LIKELY** due to one of: + +#### **Option 1: XNNPACK Delegate Not Active** (Most Likely) +The vision encoder model may not have XNNPACK delegate properly embedded: +- Models might be using **portable operators** instead of XNNPACK +- XNNPACK kernels may be deadlocking on first execution +- Delegate initialization may be incomplete + +**Evidence**: +- CMakeLists.txt links XNNPACK libraries +- No XNNPACK initialization code in C++ +- No verification that models actually use XNNPACK + +**Fix Required**: +```bash +# Re-export vision encoder with XNNPACK delegate +python export_vision_encoder.py --use-xnnpack --num-threads=4 +``` + +#### **Option 2: XNNPACK Threading Issue** +XNNPACK pthreadpool may not be initialized properly for Android: +- Default pthreadpool configuration might be incompatible +- Thread count might be misconfigured +- Threadpool might not be created + +**Evidence**: +- ExecuTorch built with `extension_threadpool` support +- No explicit pthreadpool initialization in code +- Hang suggests waiting on thread synchronization + +**Fix Required**: +```cpp +// In loadModels(), after loading vision encoder: +#include + +// Initialize XNNPACK threadpool +auto threadpool = executorch::extension::threadpool::get_threadpool(); +if (threadpool) { + LOGi("XNNPACK threadpool initialized with %d threads", threadpool->num_threads()); +} +``` + +#### **Option 3: Missing Operator Registration** +Some operators in the vision encoder might not be registered: +- XNNPACK ops might be missing from the build +- Custom ops might be needed but not linked +- Operator dispatch might be failing silently + +**Evidence**: +- Using `--whole-archive` for operator libs +- All portable/custom ops linked +- But might be missing XNNPACK-specific ops + +**Fix Required**: +```bash +# Check what ops the model uses +python -m executorch.exir.print_program vision_encoder.pte --ops-only +``` + +--- + +## 📋 TODO: Fix Vision Encoder Freeze + +### Immediate Actions (Priority Order) + +1. **Verify Model XNNPACK Export** ⭐ HIGHEST PRIORITY + ```bash + # Check model metadata + python -c " + import torch + from executorch.exir import ExecutorchProgram + prog = ExecutorchProgram.load('vision_encoder.pte') + print('Delegates:', prog.program.backend_delegate) + " + + # List operators + python -m executorch.exir.print_program vision_encoder.pte --ops-only + + # If no XNNPACK delegate, re-export: + python export_models.py \ + --model vision_encoder \ + --quantize \ + --use-xnnpack \ + --xnnpack-num-threads 4 + ``` + +2. **Add XNNPACK Initialization Code** + ```cpp + // In nanovlm_android.cpp, add to loadModels(): + + #include + + // Initialize XNNPACK (call once at startup) + xnn_status status = xnn_initialize(nullptr); + if (status != xnn_status_success) { + LOGe("Failed to initialize XNNPACK: %d", status); + return false; + } + LOGi("XNNPACK initialized successfully"); + ``` + +3. **Enable ExecuTorch Debug Logging** + ```cpp + // In CMakeLists.txt, change: + add_definitions(-DET_LOG_ENABLED=1) // Enable logging + add_definitions(-DET_MIN_LOG_LEVEL=Debug) // Verbose output + + // This will show what's happening during forward() + ``` + +4. **Test with Portable Ops First** (Fallback) + ```cpp + // If XNNPACK is the issue, verify basic execution works: + // Re-export model WITHOUT XNNPACK delegate + // Should use portable CPU ops (slower but should work) + ``` + +5. **Add Timeout & Logging** + ```cpp + // In processImageFromBuffer(), add detailed logging: + LOGi("About to call vision encoder forward..."); + auto start = std::chrono::steady_clock::now(); + + auto vision_result = vision_encoder_->forward(vision_inputs); + + auto elapsed = std::chrono::duration_cast( + std::chrono::steady_clock::now() - start).count(); + LOGi("Vision encoder forward completed in %ld ms", elapsed); + ``` + +### Investigation Steps + +1. **Check Model Files** + - Verify `.pte` files are actually using XNNPACK delegate + - Check file sizes (XNNPACK models should be larger due to delegate code) + - Validate quantization format (XNNPACK requires specific quant format) + +2. **Test Minimal Forward Pass** + ```cpp + // Create simple test in loadModels(): + std::vector test_data(1 * 3 * 512 * 512, 0.5f); + std::vector test_shape = {1, 3, 512, 512}; + auto test_tensor = from_blob(test_data.data(), test_shape, ScalarType::Float); + + LOGi("Testing vision encoder with dummy input..."); + auto test_result = vision_encoder_->forward({test_tensor}); + if (test_result.ok()) { + LOGi("Vision encoder test forward succeeded!"); + } else { + LOGe("Vision encoder test forward failed: %d", (int)test_result.error()); + } + ``` + +3. **Verify XNNPACK Libraries** + ```bash + # Check if XNNPACK libs are actually in APK: + unzip -l app/build/outputs/apk/debug/app-debug.apk | grep libbaseweightsnap + + # Check symbols in native library: + aarch64-linux-android-nm libbaseweightsnap.so | grep xnn + ``` + +--- + +## 🔧 Alternative Approaches (If Above Fails) + +### Plan B: Use Portable Ops Only +If XNNPACK continues to cause issues: +1. Export all models **without** XNNPACK delegate +2. Use portable CPU operators +3. Accept slower performance (~5-10x slower) +4. Still functional, just not optimized + +### Plan C: Split Vision Encoder +If vision encoder is too large: +1. Split into smaller chunks (patch-based processing) +2. Process image tiles one at a time +3. Aggregate results +4. Reduces memory pressure + +### Plan D: Use PyTorch Mobile +If ExecuTorch proves too unstable: +1. Switch to PyTorch Mobile (Lite Interpreter) +2. Use TorchScript models instead of `.pte` +3. More mature, better documented +4. Larger binary size but more stable + +--- + +## 📊 Current Build Configuration + +### CMake Flags +```cmake +-DC10_USING_CUSTOM_GENERATED_MACROS +-DET_ENABLE_PROGRAM_VERIFICATION=0 +-DET_LOG_ENABLED=0 # ⚠️ SHOULD ENABLE FOR DEBUGGING +-DET_MIN_LOG_LEVEL=Info # ⚠️ SHOULD SET TO Debug +-march=armv8.4a+dotprod +``` + +### ExecuTorch Build +```bash +# Location: /Users/bowserj/executorch_repos/executorch +# Branch: v1.0.0 +# Build dir: cmake-out-android-arm64-v8a +# Options: +EXECUTORCH_BUILD_XNNPACK=ON +EXECUTORCH_XNNPACK_ENABLE_KLEIDI=ON +EXECUTORCH_XNNPACK_ENABLE_WEIGHT_CACHE=ON +EXECUTORCH_XNNPACK_SHARED_WORKSPACE=ON +``` + +### Linked Libraries (18 total) +``` +libexecutorch.a (632K) +libexecutorch_core.a (2.7M) +libextension_module_static.a (1.5M) +libextension_tensor.a (1.1M) +libportable_ops_lib.a (1.7M) +libportable_kernels.a (89M) +libcustom_ops.a (2.8M) +liboptimized_native_cpu_ops_lib.a +liboptimized_kernels.a +libcpublas.a +libeigen_blas.a +libxnnpack_backend.a (3.7M) +libXNNPACK.a (13M) +libxnnpack-microkernels-prod.a (21M) +libcpuinfo.a +libpthreadpool.a +libkleidiai.a +libextension_threadpool.a +``` + +--- + +## 🎯 Next Steps (Recommended Order) + +1. **Enable debug logging** in CMakeLists.txt → Rebuild → See what happens during forward() +2. **Verify XNNPACK delegate** in vision_encoder.pte +3. **Add XNNPACK initialization** code if delegate is present +4. **Re-export model** with XNNPACK if delegate is missing +5. **Test portable ops** as fallback if XNNPACK doesn't work +6. **Consider PyTorch Mobile** if ExecuTorch remains unstable + +--- + +## 📝 Files Modified + +### C++/Native +- `app/src/main/cpp/nanovlm_android.cpp` - Main inference engine +- `app/src/main/cpp/CMakeLists.txt` - Build configuration +- `app/src/main/cpp/image_preprocessor.cpp` - Image preprocessing +- `app/src/main/cpp/config_loader.h` - Config loading + +### Kotlin/Android +- `app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt` - JNI wrapper + +### Rust +- `rust-tokenizer/src/lib.rs` - Tokenizer FFI +- `rust-tokenizer/.cargo/config.toml` - Android cross-compilation +- `rust-tokenizer/Cargo.toml` - Dependencies + +--- + +## 🐛 Known Issues + +1. **Vision encoder freezes on forward()** - BLOCKER +2. Models may not have XNNPACK delegate properly embedded +3. No error messages during freeze (silent hang) +4. No timeout mechanism implemented +5. Debug logging disabled (hard to diagnose) + +--- + +## ✨ Success Criteria + +- [ ] Vision encoder completes forward pass without freezing +- [ ] Image processing completes in <2 seconds per image +- [ ] Full inference pipeline works end-to-end +- [ ] Generates coherent text output +- [ ] Stable across multiple runs +- [ ] No memory leaks +- [ ] No crashes + +--- + +## 📚 Resources + +- ExecuTorch v1.0.0 docs: https://pytorch.org/executorch/stable/ +- XNNPACK delegate: https://pytorch.org/executorch/stable/build-run-xnnpack.html +- Android integration: https://pytorch.org/executorch/stable/demo-apps-android.html +- Debugging guide: https://pytorch.org/executorch/stable/debugging.html + +--- + +**Last Updated**: 2025-10-20 +**Status**: 🔴 BLOCKED on vision encoder freeze +**Next Action**: Enable debug logging and verify XNNPACK delegate diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt index 32493ae..6367453 100644 --- a/app/src/main/cpp/CMakeLists.txt +++ b/app/src/main/cpp/CMakeLists.txt @@ -20,8 +20,8 @@ if(${CMAKE_ANDROID_ARCH_ABI} STREQUAL "arm64-v8a") endif() # ExecuTorch configuration -set(EXECUTORCH_ROOT "/home/bowserj/executorch" CACHE PATH "Path to ExecuTorch root directory") -set(EXECUTORCH_BUILD_DIR "/home/bowserj/executorch/cmake-out-android-arm64" CACHE PATH "Path to ExecuTorch Android build") +set(EXECUTORCH_ROOT "/Users/bowserj/executorch_repos/executorch" CACHE PATH "Path to ExecuTorch root directory") +set(EXECUTORCH_BUILD_DIR "/Users/bowserj/executorch_repos/executorch/cmake-out-android-arm64-v8a" CACHE PATH "Path to ExecuTorch Android build") message(STATUS "ExecuTorch root: ${EXECUTORCH_ROOT}") message(STATUS "ExecuTorch build: ${EXECUTORCH_BUILD_DIR}") @@ -38,7 +38,9 @@ include_directories( ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10/c10/macros ${EXECUTORCH_ROOT}/extension/module ${EXECUTORCH_ROOT}/extension/tensor + ${EXECUTORCH_ROOT}/extension/threadpool ${EXECUTORCH_BUILD_DIR} + ${EXECUTORCH_ROOT}/backends/xnnpack/third-party/pthreadpool/include ) # Rust tokenizer include (relative to cpp directory) diff --git a/app/src/main/cpp/nanovlm_android.cpp b/app/src/main/cpp/nanovlm_android.cpp index 37fc81a..7410252 100644 --- a/app/src/main/cpp/nanovlm_android.cpp +++ b/app/src/main/cpp/nanovlm_android.cpp @@ -16,11 +16,13 @@ #include #include #include +#include #include #include +#include -#include "nanovlm_preprocessor.h" // Rust tokenizer FFI +#include "nanovlm_preprocessor.h" // Rust tokenizer FFI - temporarily disabled #include "image_preprocessor.h" // C++ image preprocessing #include "config_loader.h" // Config loading @@ -34,6 +36,7 @@ using executorch::extension::from_blob; using executorch::extension::TensorPtr; using executorch::extension::clone_tensor_ptr; using executorch::runtime::EValue; +using executorch::runtime::Error; // Global instance of the inference engine class NanoVLMAndroidInference { @@ -66,13 +69,27 @@ class NanoVLMAndroidInference { try { LOGi("Loading nanoVLM models from %s", model_dir.c_str()); + // Configure XNNPack threadpool for multi-core performance + unsigned int num_cores = std::thread::hardware_concurrency(); + // Use all available cores for maximum performance + // On mobile devices, this typically gives 4-8 cores + unsigned int num_threads = num_cores > 0 ? num_cores : 4; + LOGi("Configuring XNNPack threadpool with %u threads (%u cores detected)", + num_threads, num_cores); + ::executorch::extension::threadpool::get_threadpool()->_unsafe_reset_threadpool(num_threads); + // Load config config_ = load_config(model_dir + "/config.json"); LOGi("Config loaded successfully"); // Load ExecuTorch modules LOGi("Loading vision encoder from: %s", (model_dir + "/vision_encoder.pte").c_str()); - vision_encoder_ = std::make_unique(model_dir + "/vision_encoder.pte"); + vision_encoder_ = std::make_unique(model_dir + "/vision_encoder.pte", Module::LoadMode::Mmap); + auto load_err = vision_encoder_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load vision encoder: error %d", (int)load_err); + return false; + } LOGi("Vision encoder loaded successfully"); // Check if module loaded correctly @@ -87,19 +104,44 @@ class NanoVLMAndroidInference { } LOGi("Loading modality projector from: %s", (model_dir + "/modality_projector.pte").c_str()); - modality_projector_ = std::make_unique(model_dir + "/modality_projector.pte"); + modality_projector_ = std::make_unique(model_dir + "/modality_projector.pte", Module::LoadMode::Mmap); + load_err = modality_projector_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load modality projector: error %d", (int)load_err); + return false; + } LOGi("Modality projector loaded successfully"); - prefill_decoder_ = std::make_unique(model_dir + "/language_decoder_prefill.pte"); + prefill_decoder_ = std::make_unique(model_dir + "/language_decoder_prefill.pte", Module::LoadMode::Mmap); + load_err = prefill_decoder_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load prefill decoder: error %d", (int)load_err); + return false; + } LOGi("Prefill decoder loaded"); - decode_decoder_ = std::make_unique(model_dir + "/language_decoder_decode.pte"); + decode_decoder_ = std::make_unique(model_dir + "/language_decoder_decode.pte", Module::LoadMode::Mmap); + load_err = decode_decoder_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load decode decoder: error %d", (int)load_err); + return false; + } LOGi("Decode decoder loaded"); - token_embedding_ = std::make_unique(model_dir + "/token_embedding.pte"); + token_embedding_ = std::make_unique(model_dir + "/token_embedding.pte", Module::LoadMode::Mmap); + load_err = token_embedding_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load token embedding: error %d", (int)load_err); + return false; + } LOGi("Token embedding loaded"); - lm_head_ = std::make_unique(model_dir + "/lm_head.pte"); + lm_head_ = std::make_unique(model_dir + "/lm_head.pte", Module::LoadMode::Mmap); + load_err = lm_head_->load(); + if (load_err != Error::Ok) { + LOGe("Failed to load lm head: error %d", (int)load_err); + return false; + } LOGi("LM head loaded"); // Load tokenizer @@ -149,12 +191,15 @@ class NanoVLMAndroidInference { (int32_t)img.height, (int32_t)img.width}; // Sanity check: verify data is in reasonable range [0, 1] + /* float min_val = *std::min_element(img.data.begin(), img.data.end()); float max_val = *std::max_element(img.data.begin(), img.data.end()); LOGi("Running vision encoder on image %zu: shape [%d, %d, %d, %d], data range [%.3f, %.3f]", img_idx, image_shape[0], image_shape[1], image_shape[2], image_shape[3], min_val, max_val); - + */ + LOGi("Running vision encoder on image %zu: shape [%d, %d, %d, %d]", img_idx, + image_shape[0], image_shape[1], image_shape[2], image_shape[3]); auto image_tensor = from_blob(img.data.data(), image_shape, ScalarType::Float); // Run vision encoder diff --git a/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt b/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt index b7b341e..3b61c22 100644 --- a/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt +++ b/app/src/main/java/ai/baseweight/baseweightsnap/NanoVLM_Android.kt @@ -76,26 +76,28 @@ class NanoVLM_Android { * @param bitmap Input image * @return true if image processed successfully */ - fun processImage(bitmap: Bitmap): Boolean { - // Ensure bitmap is in ARGB_8888 format - val config = if (bitmap.config == Bitmap.Config.ARGB_8888) { - bitmap - } else { - bitmap.copy(Bitmap.Config.ARGB_8888, false) - } + suspend fun processImage(bitmap: Bitmap): Boolean { + return withContext(runLoop) { + // Ensure bitmap is in ARGB_8888 format + val config = if (bitmap.config == Bitmap.Config.ARGB_8888) { + bitmap + } else { + bitmap.copy(Bitmap.Config.ARGB_8888, false) + } - val byteBuffer = ByteBuffer.allocateDirect(config.byteCount) - config.copyPixelsToBuffer(byteBuffer) - byteBuffer.rewind() + val byteBuffer = ByteBuffer.allocateDirect(config.byteCount) + config.copyPixelsToBuffer(byteBuffer) + byteBuffer.rewind() - Log.d(tag, "Processing image: ${config.width}x${config.height}") - val success = nativeProcessImageFromBuffer(byteBuffer, config.width, config.height) - if (success) { - Log.d(tag, "Image processed successfully") - } else { - Log.e(tag, "Failed to process image") + Log.d(tag, "Processing image: ${config.width}x${config.height}") + val success = nativeProcessImageFromBuffer(byteBuffer, config.width, config.height) + if (success) { + Log.d(tag, "Image processed successfully") + } else { + Log.e(tag, "Failed to process image") + } + success } - return success } /** diff --git a/rust-tokenizer/Cargo.lock b/rust-tokenizer/Cargo.lock index 6e28503..b939118 100644 --- a/rust-tokenizer/Cargo.lock +++ b/rust-tokenizer/Cargo.lock @@ -2,12 +2,6 @@ # It is not intended for manual editing. version = 4 -[[package]] -name = "adler2" -version = "2.0.1" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa" - [[package]] name = "ahash" version = "0.8.12" @@ -31,21 +25,6 @@ dependencies = [ "memchr", ] -[[package]] -name = "arbitrary" -version = "1.4.2" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1" -dependencies = [ - "derive_arbitrary", -] - -[[package]] -name = "autocfg" -version = "1.5.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8" - [[package]] name = "base64" version = "0.13.1" @@ -53,43 +32,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8" [[package]] -name = "bitflags" -version = "2.9.4" +name = "bit-set" +version = "0.8.0" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "2261d10cca569e4643e526d8dc2e62e433cc8aba21ab764233731f8d369bf394" - -[[package]] -name = "block-buffer" -version = "0.10.4" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71" +checksum = "08807e080ed7f9d5433fa9b275196cfc35414f66a0c79d864dc51a0d825231a3" dependencies = [ - "generic-array", + "bit-vec", ] [[package]] -name = "bumpalo" -version = "3.19.0" +name = "bit-vec" +version = "0.8.0" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43" - -[[package]] -name = "bytemuck" -version = "1.24.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "1fbdf580320f38b612e485521afda1ee26d10cc9884efaaa750d383e13e3c5f4" - -[[package]] -name = "byteorder" -version = "1.5.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b" - -[[package]] -name = "byteorder-lite" -version = "0.1.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495" +checksum = "5e764a1d40d510daf35e07be9eb06e75770908c27d411ee6c92109c9840eaaf7" [[package]] name = "castaway" @@ -100,21 +55,11 @@ dependencies = [ "rustversion", ] -[[package]] -name = "cc" -version = "1.2.41" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "ac9fe6cdbb24b6ade63616c0a0688e45bb56732262c158df3c0c4bea4ca47cb7" -dependencies = [ - "find-msvc-tools", - "shlex", -] - [[package]] name = "cfg-if" -version = "1.0.3" +version = "1.0.4" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9" +checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801" [[package]] name = "compact_str" @@ -131,24 +76,6 @@ dependencies = [ "static_assertions", ] -[[package]] -name = "cpufeatures" -version = "0.2.17" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280" -dependencies = [ - "libc", -] - -[[package]] -name = "crc32fast" -version = "1.5.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511" -dependencies = [ - "cfg-if", -] - [[package]] name = "crossbeam-deque" version = "0.8.6" @@ -174,16 +101,6 @@ version = "0.8.21" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28" -[[package]] -name = "crypto-common" -version = "0.1.6" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3" -dependencies = [ - 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"cfg-if", - "cpufeatures", - "digest", -] - -[[package]] -name = "shlex" -version = "1.3.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64" - -[[package]] -name = "simd-adler32" -version = "0.3.7" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe" - [[package]] name = "smallvec" version = "1.15.1" @@ -992,42 +539,22 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f" [[package]] name = "syn" -version = "2.0.106" +version = "2.0.107" source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "ede7c438028d4436d71104916910f5bb611972c5cfd7f89b8300a8186e6fada6" +checksum = "2a26dbd934e5451d21ef060c018dae56fc073894c5a7896f882928a76e6d081b" dependencies = [ "proc-macro2", "quote", "unicode-ident", ] -[[package]] -name = "thiserror" -version = "1.0.69" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52" -dependencies = [ - "thiserror-impl 1.0.69", -] - [[package]] name = "thiserror" version = "2.0.17" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "f63587ca0f12b72a0600bcba1d40081f830876000bb46dd2337a3051618f4fc8" dependencies = [ - "thiserror-impl 2.0.17", -] - -[[package]] -name = "thiserror-impl" -version = "1.0.69" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1" -dependencies = [ - "proc-macro2", - "quote", - "syn", + "thiserror-impl", ] [[package]] @@ -1053,12 +580,12 @@ dependencies = [ "dary_heap", "derive_builder", "esaxx-rs", + "fancy-regex", "getrandom", "itertools", "log", "macro_rules_attribute", "monostate", - "onig", "paste", "rand", "rayon", @@ -1068,24 +595,12 @@ dependencies = [ "serde", "serde_json", "spm_precompiled", - "thiserror 2.0.17", + "thiserror", "unicode-normalization-alignments", "unicode-segmentation", "unicode_categories", ] -[[package]] -name = "typenum" -version = "1.19.0" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb" - -[[package]] -name = "ucd-trie" -version = "0.1.7" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971" - [[package]] name = "unicode-ident" version = "1.0.19" @@ -1119,15 +634,6 @@ version = "0.9.5" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a" -[[package]] -name = "wasi" -version = "0.14.7+wasi-0.2.4" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "883478de20367e224c0090af9cf5f9fa85bed63a95c1abf3afc5c083ebc06e8c" -dependencies = [ - "wasip2", -] - [[package]] name = "wasip2" version = "1.0.1+wasi-0.2.4" @@ -1162,47 +668,3 @@ dependencies = [ "quote", "syn", ] - -[[package]] -name = "zip" -version = "2.4.2" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "fabe6324e908f85a1c52063ce7aa26b68dcb7eb6dbc83a2d148403c9bc3eba50" -dependencies = [ - "arbitrary", - "crc32fast", - "crossbeam-utils", - "displaydoc", - "flate2", - "indexmap", - "memchr", - "thiserror 2.0.17", - "zopfli", -] - -[[package]] -name = "zopfli" -version = "0.8.2" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "edfc5ee405f504cd4984ecc6f14d02d55cfda60fa4b689434ef4102aae150cd7" -dependencies = [ - "bumpalo", - "crc32fast", - "log", - "simd-adler32", -] - -[[package]] -name = "zune-core" -version = "0.4.12" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a" - -[[package]] -name = "zune-jpeg" -version = "0.4.21" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "29ce2c8a9384ad323cf564b67da86e21d3cfdff87908bc1223ed5c99bc792713" -dependencies = [ - "zune-core", -] diff --git a/rust-tokenizer/Cargo.toml b/rust-tokenizer/Cargo.toml index e452c4f..123fabc 100644 --- a/rust-tokenizer/Cargo.toml +++ b/rust-tokenizer/Cargo.toml @@ -8,14 +8,12 @@ name = "nanovlm_preprocessor" crate-type = ["cdylib", "staticlib"] [dependencies] -tokenizers = { version = "0.21", default-features = false, features = ["onig"] } -image = { version = "0.25", default-features = false, features = ["png", "jpeg"] } +tokenizers = { version = "0.21", default-features = false, features = ["fancy-regex"] } serde_json = "1.0" -fast_image_resize = "5.1.4" -[dev-dependencies] -ndarray = "0.16" -ndarray-npy = "0.9" +# [dev-dependencies] +# ndarray = "0.16" +# ndarray-npy = "0.9" [profile.release] opt-level = 3 diff --git a/rust-tokenizer/src/lib.rs b/rust-tokenizer/src/lib.rs index d08aa09..1ea0467 100644 --- a/rust-tokenizer/src/lib.rs +++ b/rust-tokenizer/src/lib.rs @@ -1,9 +1,7 @@ -use image::ImageReader; use std::ffi::{CStr, CString}; -use std::os::raw::{c_char, c_float}; +use std::os::raw::{c_char}; use std::ptr; use tokenizers::Tokenizer; -use fast_image_resize::images::Image; /// Opaque handle to a tokenizer pub struct TokenizerHandle { @@ -21,24 +19,6 @@ pub struct TokenizationResult { pub num_image_tokens: usize, } -/// C-compatible struct for returning image data -#[repr(C)] -pub struct ImageData { - pub data: *mut c_float, - pub width: usize, - pub height: usize, - pub channels: usize, -} - -/// C-compatible struct for returning multiple images with grid info -#[repr(C)] -pub struct MultiImageData { - pub images: *mut ImageData, - pub num_images: usize, - pub grid_h: usize, - pub grid_w: usize, -} - /// Load a tokenizer from a JSON file and return an opaque handle /// /// # Safety @@ -218,346 +198,6 @@ pub unsafe extern "C" fn nanovlm_free_tokenization_result(result: TokenizationRe } } -/// Preprocess an image to CHW format (channels, height, width) normalized to [0, 1] -/// -/// # Safety -/// - `image_path` must be a valid null-terminated C string pointing to an image file -/// - `target_size` is the size to resize the image to (square) -/// - Caller must free the result using `nanovlm_free_image_data` -#[no_mangle] -pub unsafe extern "C" fn nanovlm_preprocess_image( - image_path: *const c_char, - target_size: usize, -) -> ImageData { - if image_path.is_null() { - return ImageData { - data: ptr::null_mut(), - width: 0, - height: 0, - channels: 0, - }; - } - - let path_cstr = unsafe { CStr::from_ptr(image_path) }; - let path = match path_cstr.to_str() { - Ok(s) => s, - Err(_) => return ImageData { - data: ptr::null_mut(), - width: 0, - height: 0, - channels: 0, - }, - }; - - // Load and decode image - let img = match ImageReader::open(path) { - Ok(reader) => match reader.decode() { - Ok(img) => img, - Err(_) => return ImageData { - data: ptr::null_mut(), - width: 0, - height: 0, - channels: 0, - }, - }, - Err(_) => return ImageData { - data: ptr::null_mut(), - width: 0, - height: 0, - channels: 0, - }, - }; - - // Resize to target size using CatmullRom (closest to PIL's BICUBIC) - let resized = img.resize_exact( - target_size as u32, - target_size as u32, - image::imageops::FilterType::CatmullRom, - ); - - // Convert to RGB - let rgb = resized.to_rgb8(); - - // Convert to CHW format and normalize to [0, 1] - let channels = 3; - let total_size = channels * target_size * target_size; - let mut data = vec![0.0f32; total_size]; - - for c in 0..channels { - for y in 0..target_size { - for x in 0..target_size { - let pixel = rgb.get_pixel(x as u32, y as u32); - let idx = c * target_size * target_size + y * target_size + x; - data[idx] = pixel[c] as f32 / 255.0; - } - } - } - - let mut data_boxed = data.into_boxed_slice(); - let data_ptr = data_boxed.as_mut_ptr(); - std::mem::forget(data_boxed); - - ImageData { - data: data_ptr, - width: target_size, - height: target_size, - channels, - } -} - -/// Free image data -/// -/// # Safety -/// - `image_data` must be a valid ImageData returned by `nanovlm_preprocess_image` -#[no_mangle] -pub unsafe extern "C" fn nanovlm_free_image_data(image_data: ImageData) { - if !image_data.data.is_null() { - let total_size = image_data.channels * image_data.width * image_data.height; - let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(image_data.data, total_size)) }; - } -} - -/// Preprocess image with dynamic resizing and splitting -/// -/// # Safety -/// - `image_path` must be a valid null-terminated C string -/// - Returns MultiImageData with global view + patches -#[no_mangle] -pub unsafe extern "C" fn nanovlm_preprocess_image_with_splitting( - image_path: *const c_char, - max_side_len: usize, - patch_size: usize, - resize_to_max: i32, -) -> MultiImageData { - if image_path.is_null() { - return MultiImageData { - images: ptr::null_mut(), - num_images: 0, - grid_h: 0, - grid_w: 0, - }; - } - - let path_cstr = unsafe { CStr::from_ptr(image_path) }; - let path = match path_cstr.to_str() { - Ok(s) => s, - Err(_) => return MultiImageData { - images: ptr::null_mut(), - num_images: 0, - grid_h: 0, - grid_w: 0, - }, - }; - - // Load image - let img = match ImageReader::open(path) { - Ok(reader) => match reader.decode() { - Ok(img) => img, - Err(_) => return MultiImageData { - images: ptr::null_mut(), - num_images: 0, - grid_h: 0, - grid_w: 0, - }, - }, - Err(_) => return MultiImageData { - images: ptr::null_mut(), - num_images: 0, - grid_h: 0, - grid_w: 0, - }, - }; - - let (orig_w, orig_h) = (img.width() as usize, img.height() as usize); - - // 1. Dynamic resize - let (new_h, new_w) = compute_dynamic_resize(orig_h, orig_w, max_side_len, patch_size, resize_to_max != 0); - - let resized = img.resize_exact( - new_w as u32, - new_h as u32, - image::imageops::FilterType::CatmullRom, - ); - - // 2. Split into patches - let grid_h = new_h / patch_size; - let grid_w = new_w / patch_size; - let _num_patches = grid_h * grid_w; - - // 3. Create global view + patches (unless only 1 patch) - let mut image_list = Vec::new(); - - if grid_h == 1 && grid_w == 1 { - // Only one patch - don't add global view - let patch = process_image_to_chw(&resized, patch_size, patch_size); - image_list.push(patch); - } else { - // Multiple patches - add global view first using BICUBIC interpolation - // This matches Python's torchvision.transforms.functional.resize with BICUBIC - let global_data = resize_bicubic(&resized, patch_size, patch_size); - image_list.push(global_data); - - // Add all patches - for row in 0..grid_h { - for col in 0..grid_w { - let x = col * patch_size; - let y = row * patch_size; - - let patch = resized.crop_imm(x as u32, y as u32, patch_size as u32, patch_size as u32); - let patch_data = process_image_to_chw(&patch, patch_size, patch_size); - image_list.push(patch_data); - } - } - } - - // Convert to C-compatible format - let num_images = image_list.len(); - let images_vec: Vec = image_list.into_iter().map(|(data, w, h, c)| { - ImageData { - data, - width: w, - height: h, - channels: c, - } - }).collect(); - - let images_boxed = images_vec.into_boxed_slice(); - let images_ptr = Box::into_raw(images_boxed) as *mut ImageData; - - MultiImageData { - images: images_ptr, - num_images, - grid_h, - grid_w, - } -} - -/// Free multiple image data -/// -/// # Safety -/// - `multi_image_data` must be a valid MultiImageData -#[no_mangle] -pub unsafe extern "C" fn nanovlm_free_multi_image_data(multi_image_data: MultiImageData) { - if !multi_image_data.images.is_null() { - let images_slice = unsafe { - std::slice::from_raw_parts_mut(multi_image_data.images, multi_image_data.num_images) - }; - - // Free each image's data - for img in images_slice.iter() { - if !img.data.is_null() { - let total_size = img.channels * img.width * img.height; - let _ = unsafe { Box::from_raw(std::slice::from_raw_parts_mut(img.data, total_size)) }; - } - } - - // Free the images array itself - let _ = unsafe { Box::from_raw(images_slice) }; - } -} - -// Helper function: compute dynamic resize dimensions -fn compute_dynamic_resize(h: usize, w: usize, max_side_len: usize, patch_size: usize, resize_to_max: bool) -> (usize, usize) { - let (long, short) = if w >= h { (w, h) } else { (h, w) }; - - // Target long side - let target_long = if resize_to_max { - max_side_len - } else { - max_side_len.min((long + patch_size - 1) / patch_size * patch_size) - }; - - // Scale factor - let scale = target_long as f64 / long as f64; - - // Compute short side with ceiling to never undershoot - let target_short = ((short as f64 * scale / patch_size as f64).ceil() as usize * patch_size).max(patch_size); - - if w >= h { - (target_short, target_long) - } else { - (target_long, target_short) - } -} - -// Helper function: resize image using bicubic interpolation (matches Python's BICUBIC) -fn resize_bicubic(img: &image::DynamicImage, target_w: usize, target_h: usize) -> (*mut c_float, usize, usize, usize) { - use fast_image_resize as fr; - - let rgb = img.to_rgb8(); - let (src_w, src_h) = rgb.dimensions(); - - // Create source image for fast_image_resize - let src_image = Image::from_vec_u8( - src_w, - src_h, - rgb.into_raw(), - fr::PixelType::U8x3, - ).unwrap(); - - // Create destination image - let mut dst_image = Image::new( - target_w as u32, - target_h as u32, - fr::PixelType::U8x3, - ); - - // Resize with bicubic (CatmullRom) - v5.1.4 API - let mut resizer = fr::Resizer::new(); - resizer.resize( - &src_image, - &mut dst_image, - &fr::ResizeOptions::new().resize_alg(fr::ResizeAlg::Convolution(fr::FilterType::CatmullRom)) - ).unwrap(); - - // Convert to CHW format and normalize to [0, 1] - let channels = 3; - let total_size = channels * target_h * target_w; - let mut chw_data = vec![0.0f32; total_size]; - let dst_buffer = dst_image.buffer(); - - for c in 0..channels { - for y in 0..target_h { - for x in 0..target_w { - let src_idx = (y * target_w + x) * 3 + c; - let dst_idx = c * target_h * target_w + y * target_w + x; - chw_data[dst_idx] = dst_buffer[src_idx] as f32 / 255.0; - } - } - } - - let mut data_boxed = chw_data.into_boxed_slice(); - let data_ptr = data_boxed.as_mut_ptr(); - std::mem::forget(data_boxed); - - (data_ptr, target_w, target_h, channels) -} - -// Helper function: process image to CHW format -fn process_image_to_chw(img: &image::DynamicImage, target_w: usize, target_h: usize) -> (*mut c_float, usize, usize, usize) { - let rgb = img.to_rgb8(); - - let channels = 3; - let total_size = channels * target_h * target_w; - let mut data = vec![0.0f32; total_size]; - - for c in 0..channels { - for y in 0..target_h { - for x in 0..target_w { - let pixel = rgb.get_pixel(x as u32, y as u32); - let idx = c * target_h * target_w + y * target_w + x; - data[idx] = pixel[c] as f32 / 255.0; - } - } - } - - let mut data_boxed = data.into_boxed_slice(); - let data_ptr = data_boxed.as_mut_ptr(); - std::mem::forget(data_boxed); - - (data_ptr, target_w, target_h, channels) -} - /// Decode token IDs back to text /// /// # Safety @@ -598,162 +238,4 @@ pub unsafe extern "C" fn nanovlm_free_string(str: *mut c_char) { if !str.is_null() { let _ = unsafe { CString::from_raw(str) }; } -} - -#[cfg(test)] -mod tests { - use super::*; - use ndarray::Array3; - use ndarray_npy::ReadNpyExt; - use std::fs::File; - - #[test] - fn test_image_preprocessing_matches_python() { - // Load Python reference data - let python_tensor_path = "../test_image_tensor.npy"; - let python_tensor_file = File::open(python_tensor_path) - .expect("Failed to open test_image_tensor.npy - run dump_preprocessing_reference.py first"); - let python_tensor: Array3 = Array3::read_npy(python_tensor_file) - .expect("Failed to read numpy array"); - - println!("Python tensor shape: {:?}", python_tensor.shape()); - - // Run Rust preprocessing - let image_path = "../assets/image.png"; - let target_size = 512; - - let image_path_cstr = CString::new(image_path).unwrap(); - let image_data = unsafe { - nanovlm_preprocess_image(image_path_cstr.as_ptr(), target_size) - }; - - assert!(!image_data.data.is_null(), "Image preprocessing failed"); - assert_eq!(image_data.width, target_size); - assert_eq!(image_data.height, target_size); - assert_eq!(image_data.channels, 3); - - // Convert to slice for comparison - let total_size = image_data.channels * image_data.width * image_data.height; - let rust_data = unsafe { - std::slice::from_raw_parts(image_data.data, total_size) - }; - - // Compare against Python output - let python_flat = python_tensor.as_slice().unwrap(); - - let mut max_diff = 0.0f32; - let mut num_mismatches = 0; - let tolerance = 1e-6; - - for (i, (&rust_val, &python_val)) in rust_data.iter().zip(python_flat.iter()).enumerate() { - let diff = (rust_val - python_val).abs(); - if diff > tolerance { - num_mismatches += 1; - if diff > max_diff { - max_diff = diff; - if num_mismatches <= 5 { - println!("Mismatch at index {}: rust={:.6}, python={:.6}, diff={:.6}", - i, rust_val, python_val, diff); - } - } - } - } - - println!("Max difference: {:.6}", max_diff); - println!("Number of mismatches (tolerance={:.6}): {}/{}", tolerance, num_mismatches, total_size); - - // Cleanup - unsafe { nanovlm_free_image_data(image_data); } - - // CatmullRom is close to BICUBIC but not identical - allow up to 2% difference - // This is acceptable for inference (4/255 quantization difference) - assert!(max_diff < 0.02, "Image preprocessing differs from Python by {:.6}", max_diff); - } - - #[test] - fn test_tokenization_matches_python() { - // Load Python reference data - let token_ids_path = "../test_token_ids.npy"; - let token_ids_file = File::open(token_ids_path) - .expect("Failed to open test_token_ids.npy - run dump_preprocessing_reference.py first"); - let python_token_ids: ndarray::Array1 = ndarray::Array1::read_npy(token_ids_file) - .expect("Failed to read token IDs"); - - let positions_path = "../test_image_token_positions.npy"; - let positions_file = File::open(positions_path) - .expect("Failed to open test_image_token_positions.npy"); - let python_positions: ndarray::Array1 = ndarray::Array1::read_npy(positions_file) - .expect("Failed to read positions"); - - println!("Python tokens: {}", python_token_ids.len()); - println!("Python image token positions: {}", python_positions.len()); - - // Run Rust tokenization - let tokenizer_path = "/tmp/tokenizer/tokenizer.json"; - let image_token = "<|image|>"; - let prompt = "What is in this image?"; - let image_token_length = 256; - - let tokenizer_path_cstr = CString::new(tokenizer_path).unwrap(); - let image_token_cstr = CString::new(image_token).unwrap(); - let prompt_cstr = CString::new(prompt).unwrap(); - - let tokenizer_handle = unsafe { - nanovlm_load_tokenizer(tokenizer_path_cstr.as_ptr(), image_token_cstr.as_ptr()) - }; - assert!(!tokenizer_handle.is_null(), "Failed to load tokenizer"); - - let tok_result = unsafe { - nanovlm_tokenize(tokenizer_handle, prompt_cstr.as_ptr(), image_token_length) - }; - - assert!(!tok_result.token_ids.is_null(), "Tokenization failed"); - - // Compare token IDs - let rust_tokens = unsafe { - std::slice::from_raw_parts(tok_result.token_ids, tok_result.num_tokens) - }; - - println!("Rust tokens: {}", rust_tokens.len()); - - assert_eq!(rust_tokens.len(), python_token_ids.len(), - "Token count mismatch: Rust={}, Python={}", - rust_tokens.len(), python_token_ids.len()); - - let mut num_mismatches = 0; - for (i, (&rust_id, &python_id)) in rust_tokens.iter().zip(python_token_ids.iter()).enumerate() { - if rust_id != python_id { - num_mismatches += 1; - if num_mismatches <= 5 { - println!("Token mismatch at index {}: rust={}, python={}", i, rust_id, python_id); - } - } - } - - assert_eq!(num_mismatches, 0, "Found {} token mismatches", num_mismatches); - - // Compare image token positions - let rust_positions = unsafe { - std::slice::from_raw_parts(tok_result.image_token_positions, tok_result.num_image_tokens) - }; - - println!("Rust image token positions: {}", rust_positions.len()); - - assert_eq!(rust_positions.len(), python_positions.len() as usize, - "Image token position count mismatch"); - - for (i, (&rust_pos, &python_pos)) in rust_positions.iter().zip(python_positions.iter()).enumerate() { - assert_eq!(rust_pos, python_pos as usize, - "Position mismatch at index {}: rust={}, python={}", - i, rust_pos, python_pos); - } - - println!("✅ Tokenization matches Python exactly!"); - - // Cleanup - unsafe { - nanovlm_free_tokenization_result(tok_result); - nanovlm_free_tokenizer(tokenizer_handle); - } - } -} +} \ No newline at end of file