[Webkit-unassigned] [Bug 171423] New: Variable GPOS mark positions not working

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 28 01:45:14 PDT 2017


            Bug ID: 171423
           Summary: Variable GPOS mark positions 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: mmaxfield at apple.com

Created attachment 308511

  --> https://bugs.webkit.org/attachment.cgi?id=308511&action=review

Variable GPOS test with shifting mark anchor

This reftest using an additional axis VM2B in the variabletest_box
font fails to work in WebKit nightly r215833. However, the *_expected.html file renders correctly. 

The VM2B axis of this font shifts the mark anchor to the left, leading to the
combining mark SQUARE BELOW shifting right when the axis parameter is
adjusted from 0 to 1000. As the reference in the ref test, the font also
contains two additional glyphs N and O, which have fixed base anchors at
the middle and right position. A rendering of the M character showing
"m2b pos", followed by COMBINING SQUARE BELOW with VM2B 0, 500, 1000
applied must thus be equal to renderings of the N and O glyph with no
VM2B variation values applied.

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