[Webkit-unassigned] [Bug 173880] New: [OpenType Variations] Glyphs with avar table not scaled correctly in CoreText on 10.12.5

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173880

            Bug ID: 173880
           Summary: [OpenType Variations] Glyphs with avar table not
                    scaled correctly in CoreText on 10.12.5
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d-r at roettsches.de
                CC: mmaxfield at apple.com

Rendering a font which shifts requested variation axis coordinates using a mapping from the avar table for this axis [https://www.microsoft.com/typography/otspec/avar.htm ] results in incorrect glyph shapes if the avar mapping is different from the default linear mapping without avar.

I discovered this while working on a test suite for the font matching section 5.2. of CSS Fonts Level 4. My test font contains an avar table. I'll point to the web platform tests pull request once that's uploaded.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20170627/d0d876eb/attachment-0001.html>