[Webkit-unassigned] [Bug 171368] New: GSUB rvrn FeatureVariations not working
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Apr 27 00:42:29 PDT 2017
https://bugs.webkit.org/show_bug.cgi?id=171368
Bug ID: 171368
Summary: GSUB rvrn FeatureVariations not working
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: litherum at gmail.com, mmaxfield at apple.com
Created attachment 308361
--> https://bugs.webkit.org/attachment.cgi?id=308361&action=review
rvrn FeatureVariations testcase
The rvrn feature [1] and the FeatureVariations part of GSUB describe
single glyph substitutions dependent on variation axis values.
The variabletest_box.ttf font I am attaching was
extended to have two new glyphs for r and R respectively displaying
"rvrn base" and "rvrn subst" (for "substituted"). When a new axis
'fvtt', ranging from 0 to 10, is set to >= 5, the rvrn_base glyph is
replaced with the rvrn_subst glyph. This enables creating a reftest of
where a lowercase r with font-variation-settings: "fvtt" 10; must match
the uppercase R, which selects the "rvrn_subst" glyph explicitly.
[1] https://www.microsoft.com/typography/OTSpec/features_pt.htm#rvrn
The test case attached fails to work in WebKit nightly r215833.
I am planning on upstreaming the test case WPT css/fonts-4, including the font which has more variation testing features.
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