Basic support for .ttc fonts — load first font instead of failing #554
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stb_truetype supports .ttc fonts, but you have to pass in an offset to say which font in the collection you want. Before, we would always pass in 0, which isn't a valid offset, causing .ttc fonts to fail to load. Now, we pass in the offset of the first font in the collection. stbtt_GetFontOffsetForIndex is defined to return 0 if the font is a normal .ttf, so in that case the behaviour is unchanged.
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stb_truetype supports .ttc fonts, but you have to pass in an offset to say which font in the collection you want. Before, we would always pass in 0, which isn't a valid offset, causing .ttc fonts to fail to load. Now, we pass in the offset of the first font in the collection.
stbtt_GetFontOffsetForIndex is defined to return 0 if the font is a normal .ttf, so in that case the behaviour is unchanged.