Add COLRv1 color font rendering support #27
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simoncozens merged 3 commits intomainfrom Apr 3, 2026
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Adds a ColorRenderer that renders COLR v0/v1 glyphs via skrifa's ColorPainter trait and tiny-skia as the 2D backend. Each glyph is rendered once and cached as an RGBA tile; subsequent uses composite the cached tile. The existing outline renderer is unchanged and used for non-color fonts via an if/else dispatch in diff_many_words.
Four tests using a subsetted Nabla COLRv1 font: - render produces a non-empty image - cached glyph tiles contain actual color (not just grayscale) - glyph cache is reused across words - same font compared to itself yields zero pixel diff
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Adds a ColorRenderer that renders COLR v0/v1 glyphs via skrifa's ColorPainter trait and tiny-skia as the 2D backend.
Each glyph is rendered once and cached as an RGBA tile; subsequent uses composite the cached tile.
The existing outline renderer is unchanged and used for non-color fonts via an if/else dispatch in diff_many_words.