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Fix PC sprite left-edge clipping underwrite #122

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Merged
segrax merged 1 commit into from
May 24, 2026
Merged

Fix PC sprite left-edge clipping underwrite #122

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8 changes: 8 additions & 0 deletions Source/PC/Graphics_PC.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -694,6 +694,14 @@ bool cGraphics_PC::Sprite_OnScreen_Check() {
mFodder->mVideo_Draw_Columns -= ax;
ax >>= 1;
mFodder->mVideo_Draw_FrameDataPtr += ax;

// Ensure the destination X never remains negative after clipping.
// A remaining -1 here would underflow the destination pointer in Video_Draw_8.
if (mFodder->mVideo_Draw_PosX < 0)
{
++mFodder->mVideo_Draw_PosX;
--mFodder->mVideo_Draw_Columns;
}
}

ax = mFodder->mVideo_Draw_PosX + mFodder->mVideo_Draw_Columns;
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