[Webkit-unassigned] [Bug 161493] [FreeType] Incorrect application of glyph positioning in the Y direction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161493

--- Comment #3 from Khaled Hosny <khaledhosny at eglug.org> ---
Upon further examination, it seems that Y offsets returned from HarfBuzz are eventually discarded when creating the GlyphBuffer. In HarfBuzzShaper::fillGlyphBufferFromHarfBuzzRun(), the Y offset is (incorrectly?) used to calculate the Y advance of the glyph. Also it seems that support for Y offsets in GlyphBuffer is enabled only on Windows.

So probably what is needed here is to enable GlyphBuffer offsets also for Gtk, populate the from HarfBuzz runs, and finally using them in FontCascade::drawGlyphs().

This is all pure speculation from just reading the code.

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