[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

Carlos Garcia Campos <cgarcia at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |cgarcia at igalia.com

--- Comment #37 from Carlos Garcia Campos <cgarcia at igalia.com> ---
I think the problem is that ComplexTextController adds glyph origins to their advance in a single advances. But in cairo we need origins and advances separately. We need to apply the current origin when drawing, and then advance. We are using the current point as origin, and then advancing the advance + origin. In these examples there's a y origin we are ignoring.

So, we have:

glyphs[i] = { glyphsData[i], xOffset, yOffset };
xOffset += advances[i].width();

this should be

glyphs[i] = { glyphsData[i], xOffset + xOrigin, yOffset + yOrigin };
xOffset += advances[i].width();

but we don't have the origins in GlyphBuffer.

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