commit | 5195bd9e41e32e7e9ee05bccdd0391595cfde6d8 | [log] [tgz] |
---|---|---|
author | Frédéric Wang <fwang@igalia.com> | Fri Jan 27 22:00:44 2023 |
committer | Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> | Fri Jan 27 22:00:44 2023 |
tree | 01940fde0014c2d4ad38d2f1c26f0604174b41af | |
parent | e984b029c5093245073dddc9fa64bbd5af755e7b [diff] |
[mathml] Fix offset of vertical glyph assembly When ShapeResult::CreateForStretchyMathOperator shapes vertical glyph assemblies, the offset of each part is adjusted by the advance specified in the corresponding MathGlyphVariantRecord table [1]. Note that this may be slightly different from the calculated ink height of the glyph, but is faster to get. In any case the baselines of glyphs are used as a reference when setting an offset in ShapeResults, so this CL changes the adjustment to use the glyph ink ascent instead of the glyph ink height. This CL fixes rendering issues for vertical stretchy MathML Operators for fonts like Cambria Math that use non-zero ink descent for parts in a glyph assembly. StretchyOperatorShaperTest.GlyphVariants is tweaked to use an equivalent stretchy.woff font (glyphs have zero ink descent) and a new test StretchyOperatorShaperTest.GlyphVariantsCenteredOnBaseline is introduced for a similar stretchy-centered-on-baseline.woff (glyphs have non-zero and equal ink ascent/descent). Finally, a WPT test is added to check that the painting of a vertical glyph assembly with the two fonts above matches the location of their bounding boxes. [1] https://learn.microsoft.com/en-us/typography/opentype/spec/math Bug: 1409380 Change-Id: I173c1cf461cebe3523e1a10aaf8d7b479bca03ad Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4197134 Commit-Queue: Frédéric Wang <fwang@igalia.com> Reviewed-by: Dominik Röttsches <drott@chromium.org> Cr-Commit-Position: refs/heads/main@{#1098136}
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