Add colored emoji support on Windows (DirectWrite) - #83
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Decompose color glyph runs via IDWriteFactory2::TranslateColorGlyphRun and composite the per-color layers into an RGBA bitmap; non-color glyphs continue through the existing ClearType greyscale path. Enables colored emoji rendering on Windows. Adds the winapi dwrite_2/d2d1 feature flags required for the color APIs.
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Summary
Adds colored emoji (COLR) rendering to the DirectWrite backend on Windows. Color glyphs are decomposed into their per-color layers via
IDWriteFactory2::TranslateColorGlyphRunand composited into an RGBA bitmap; non-color glyphs continue through the existing ClearType greyscale path unchanged.Before this change, emoji rendered as monochrome outline glyphs on Windows. They now render in full color.
Changes
ColorFactorywrappingIDWriteFactory2, used to enumerate color glyph runs.BitmapBuffer.DWRITE_E_NOCOLOR), and honor the foreground palette index (0xFFFF).winapidwrite/dwrite_1/dwrite_2/d2d1/dcommon/unknwnbase/winerrorfeatures required for the color APIs.Testing
cargo checkbuilds clean on stable (Windows).cfg(windows)DirectWrite module.