[Webkit-unassigned] [Bug 190255] New: [GTK][WPE] VDMX vertical font metrics support

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190255

            Bug ID: 190255
           Summary: [GTK][WPE] VDMX vertical font metrics support
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: olivier.blin at softathome.com
                CC: bugs-noreply at webkitgtk.org, fred.wang at free.fr,
                    loic.yhuel at softathome.com, mcatanzaro at igalia.com,
                    mmaxfield at apple.com, mrobinson at webkit.org,
                    zan at falconsigh.net

Some fonts specify their ascent and descent values for a given size in a table called VDMX.
The specification is available here: https://docs.microsoft.com/en-us/typography/opentype/spec/vdmx

This used to be supported by the Chromium port: https://bugs.webkit.org/show_bug.cgi?id=25116

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