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Fonts: Better assert during load when passing truncated font data or wrong data size. (#6822)

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ocornut
2023-09-14 14:40:19 +02:00
parent c32db3c72b
commit 32171a8b0c
3 changed files with 10 additions and 5 deletions
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10
imgui_draw.cpp
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@@ -2249,13 +2249,14 @@ ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels,
}
// NB: Transfer ownership of 'ttf_data' to ImFontAtlas, unless font_cfg_template->FontDataOwnedByAtlas == false. Owned TTF buffer will be deleted after Build().
ImFont* ImFontAtlas::AddFontFromMemoryTTF(void* ttf_data, int ttf_size, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
ImFont* ImFontAtlas::AddFontFromMemoryTTF(void* font_data, int font_data_size, float size_pixels, const ImFontConfig* font_cfg_template, const ImWchar* glyph_ranges)
{
IM_ASSERT(!Locked && "Cannot modify a locked ImFontAtlas between NewFrame() and EndFrame/Render()!");
ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
IM_ASSERT(font_cfg.FontData == NULL);
font_cfg.FontData = ttf_data;
font_cfg.FontDataSize = ttf_size;
IM_ASSERT(font_data_size > 100 && "Incorrect value for font_data_size!"); // Heuristic to prevent accidentally passing a wrong value to font_data_size.
font_cfg.FontData = font_data;
font_cfg.FontDataSize = font_data_size;
font_cfg.SizePixels = size_pixels > 0.0f ? size_pixels : font_cfg.SizePixels;
if (glyph_ranges)
font_cfg.GlyphRanges = glyph_ranges;
@@ -2470,7 +2471,10 @@ static bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
const int font_offset = stbtt_GetFontOffsetForIndex((unsigned char*)cfg.FontData, cfg.FontNo);
IM_ASSERT(font_offset >= 0 && "FontData is incorrect, or FontNo cannot be found.");
if (!stbtt_InitFont(&src_tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
{
IM_ASSERT(0 && "stbtt_InitFont(): failed to parse FontData. It is correct and complete? Check FontDataSize.");
return false;
}
// Measure highest codepoints
ImFontBuildDstData& dst_tmp = dst_tmp_array[src_tmp.DstIndex];