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Change: Check glyph size before trying to render it. 

This change of order ensures that the "Font glyph is foot large" occurs
even if the glyph is too large for an alloca() allocation.
pull/10352/head
Peter Nelson 2023-01-14 18:09:00 +00:00 committed by PeterN
parent fa0c67b10a
commit 8149ba338f
1 changed files with 4 additions and 4 deletions
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8
src/os/windows/font_win32.cpp
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@ -440,10 +440,6 @@ void Win32FontCache::ClearFontCache()
DWORD size = GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, 0, nullptr, &mat);
if (size == GDI_ERROR) usererror("Unable to render font glyph");
/* Call GetGlyphOutline again with size to actually render the glyph. */
byte *bmp = AllocaM(byte, size);
GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, size, bmp, &mat);
/* Add 1 scaled pixel for the shadow on the medium font. Our sprite must be at least 1x1 pixel. */
uint shadow = (this->fs == FS_NORMAL) ? ScaleGUITrad(1) : 0;
uint width = std::max(1U, (uint)gm.gmBlackBoxX + shadow);
@ -452,6 +448,10 @@ void Win32FontCache::ClearFontCache()
/* Limit glyph size to prevent overflows later on. */
if (width > MAX_GLYPH_DIM || height > MAX_GLYPH_DIM) usererror("Font glyph is too large");
/* Call GetGlyphOutline again with size to actually render the glyph. */
byte *bmp = AllocaM(byte, size);
GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, size, bmp, &mat);
/* GDI has rendered the glyph, now we allocate a sprite and copy the image into it. */
SpriteLoader::Sprite sprite;
sprite.AllocateData(ZOOM_LVL_NORMAL, width * height);