[Webkit-unassigned] [Bug 51450] Glyphs in vertical text tests are rotated 90 degrees clockwise on Chromium Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51450





--- Comment #45 from Koji Ishii <kojiishi at gmail.com>  2012-08-17 23:30:52 PST ---
One more issue: fast/text/international/text-spliced-font-expected.png has wrong expectation for complex path. This is captured in bug 86071, each platform needs fix but in general, WebKit handles vertical flow poorly in complex path.

On Windows, the complex code path issue is more complicated than other platform because Uniscribe does not support East Asian vertical flow. I had some discussion with bashi at google. I think the best long term plan for Chromium Win is to move to DirectWrite, which supports both East Asian vertical flow and complex scripts. We may also need to rely on harfbuzz-ng for complex OpenType handling as spec'ed in CSS Writing Modes Level 3, but our discussion hasn't come to a conclusion whether just DirectWrite is good enough to cover the spec or not.

This bug is to cover simple code path only, which covers most cases required in East Asia. I'll keep watching for more comprehensive solution for complex code path.

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