ImFontAtlas: Handle stb_truetype failure more gracefully, GetTexDataAsRGBA32() won't crash during conversion. (#1527)
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@ -1439,11 +1439,14 @@ void ImFontAtlas::GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_wid
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{
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unsigned char* pixels;
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GetTexDataAsAlpha8(&pixels, NULL, NULL);
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TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
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const unsigned char* src = pixels;
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unsigned int* dst = TexPixelsRGBA32;
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for (int n = TexWidth * TexHeight; n > 0; n--)
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*dst++ = IM_COL32(255, 255, 255, (unsigned int)(*src++));
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if (pixels)
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{
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TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
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const unsigned char* src = pixels;
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unsigned int* dst = TexPixelsRGBA32;
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for (int n = TexWidth * TexHeight; n > 0; n--)
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*dst++ = IM_COL32(255, 255, 255, (unsigned int)(*src++));
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}
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}
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*out_pixels = (unsigned char*)TexPixelsRGBA32;
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@ -1683,6 +1686,7 @@ bool ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
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IM_ASSERT(font_offset >= 0);
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if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
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{
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atlas->TexWidth = atlas->TexHeight = 0; // Reset output on failure
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ImGui::MemFree(tmp_array);
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return false;
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}
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