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ImFontAtlas: heuristic increase texture width up to 4096 with 4000+ glyphs. Various comments (#491)

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ocornut
2016-01-20 10:30:28 +00:00
parent 3922988dea
commit e585204d82
3 changed files with 15 additions and 6 deletions
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5
imgui_draw.cpp
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@ -1244,8 +1244,9 @@ bool ImFontAtlas::Build()
}
}
// Start packing
TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512; // Width doesn't actually matters much but some API/GPU have texture size limitations, and increasing width can decrease height.
// Start packing. We need a known width for the skyline algorithm. Using a cheap heuristic here to decide of width. User can override TexDesiredWidth if they wish.
// After packing is done, width shouldn't matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
TexWidth = (TexDesiredWidth > 0) ? TexDesiredWidth : (total_glyph_count > 4000) ? 4096 : (total_glyph_count > 2000) ? 2048 : (total_glyph_count > 1000) ? 1024 : 512;
TexHeight = 0;
const int max_tex_height = 1024*32;
stbtt_pack_context spc;