Bug 173880 - [OpenType Variations] Glyphs with avar table not scaled correctly in CoreText on 10.12.5
Summary: [OpenType Variations] Glyphs with avar table not scaled correctly in CoreText...
Status: RESOLVED MOVED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Text (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2017-06-27 11:13 PDT by Dominik Röttsches (drott)
Modified: 2022-02-10 19:37 PST (History)
3 users (show)

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Description Dominik Röttsches (drott) 2017-06-27 11:13:08 PDT 
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.
Comment 1 Dominik Röttsches (drott) 2017-06-27 11:16:44 PDT 
This occurs with WebKit Nightly r218832 on mac OS 10.12.5
Comment 2 Radar WebKit Bug Importer 2017-06-27 12:02:09 PDT 
<rdar://problem/33010505>
Comment 3 Brent Fulgham 2022-02-10 19:37:36 PST 
The fix for this issue was needed outside the WebKit project, therefore this is being resolved as 'Moved'.

This should now be fixed in shipping software.