[Webkit-unassigned] [Bug 214769] Spacing of Chinese characters is inconsistent in macOS 11/Safari 14 beta

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214769

--- Comment #7 from Myles C. Maxfield <mmaxfield at apple.com> ---
After calling Font::applyTransforms(), some of the advances are 16 and some are 21. Looks like this is caused by us applying letter-spacing before shaping, rather than after shaping.

If we wanted to do it correctly, we would have to apply letter-spacing after shaping. However, for that, we need to be able to determine which glyphs come from which characters, which CTFontTransformGlyphsWithLanguage() does not do. Other functions may do this, though.

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