Fix bounding box issues for text

Author: LaurenzV

src/render/text.rs

@@ -107,18 +107,22 @@ pub fn write_font(chunk: &mut Chunk, alloc: &mut RefAllocator, font: &mut Font)
     flags.insert(FontFlags::SYMBOLIC);
     flags.insert(FontFlags::SMALL_CAP);
 
+    let convert = |val| {
+        (val / units_per_em as f32) * 1000.0
+    };
+
     let global_bbox = ttf.global_bounding_box();
     let bbox = pdf_writer::Rect::new(
-        (global_bbox.x_min as f32 / units_per_em as f32) * 1000.0,
-        (global_bbox.y_min as f32 / units_per_em as f32) * 1000.0,
-        (global_bbox.x_max as f32 / units_per_em as f32) * 1000.0,
-        (global_bbox.y_max as f32 / units_per_em as f32) * 1000.0,
+        convert(global_bbox.x_min as f32),
+        convert(global_bbox.y_min as f32),
+        convert(global_bbox.x_max as f32),
+        convert(global_bbox.y_max as f32),
     );
 
     let italic_angle = ttf.italic_angle().unwrap_or(0.0);
-    let ascender = ttf.typographic_ascender().unwrap_or(ttf.ascender());
-    let descender = ttf.typographic_descender().unwrap_or(ttf.descender());
-    let cap_height = ttf.capital_height().filter(|&h| h > 0).unwrap_or(ascender);
+    let ascender = convert(ttf.typographic_ascender().unwrap_or(ttf.ascender()) as f32);
+    let descender = convert(ttf.typographic_descender().unwrap_or(ttf.descender()) as f32);
+    let cap_height = ttf.capital_height().filter(|&h| h > 0).map(|h| convert(h as f32)).unwrap_or(ascender);
     let stem_v = 10.0 + 0.244 * (f32::from(ttf.weight().to_number()) - 50.0);
 
     // Write the font descriptor (contains metrics about the font).