[cairo-bugs] [Bug 91829] New: Glyph size/appearance errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91829

            Bug ID: 91829
           Summary: Glyph size/appearance errors
           Product: cairo
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: xlib backend
          Assignee: chris at chris-wilson.co.uk
          Reporter: freedesktop-bugs at jbeekman.nl
        QA Contact: cairo-bugs at cairographics.org

Created attachment 118021
  --> https://bugs.freedesktop.org/attachment.cgi?id=118021&action=edit
Compile with gcc -I/usr/include/freetype2 -I/usr/include/cairo
cairo_xlib_simple.c  -lcairo -lX11 -lfreetype

Certain fonts/sizes get rendered incorrectly on certain distributions of Linux.
This mostly happens when rendering PDFs that were generated using LaTeX in a
browser using pdf.js.

I have extracted and attached the font from a PDF file with a rendering error
(as converted to OpenType using pdf.js). I have attached a small test program
that demonstrates the error using that font.

Distributions that seem to be affected:
* Most versions of Ubuntu/Debian
* Arch Linux with infinality-patched freetype/fontconfig/cairo

This seems to be a long-standing bug across many versions of various software.
Firefox bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1200077
pdf.js bug report: https://github.com/mozilla/pdf.js/issues/2594

In the next few comments I will attach screenshots of renderings including
version information.

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