[Webkit-unassigned] [Bug 161493] New: Incorrect application of glyph positioning in the Y direction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161493

            Bug ID: 161493
           Summary: Incorrect application of glyph positioning in the Y
                    direction
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: khaledhosny at eglug.org
                CC: bugs-noreply at webkitgtk.org

Created attachment 287632
  --> https://bugs.webkit.org/attachment.cgi?id=287632&action=review
Rendering in Epiphany

The vertical placement of glyphs seems to be applied wrongly, for example the Arabic glyphs in https://fonts.google.com/specimen/Aref+Ruqaa and https://fonts.google.com/specimen/Reem+Kufi has their dots moved incorrectly above or below the glyphs.

I suspect this is relative to the fact that in fonts Y moves up while in many graphical systems it moves down, so the Y positions returned from HarfBuzz need to be negated at some point.

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