[cairo-bugs] [Bug 40458] New: Font rendering with CAIRO_ANTIALIAS_GRAY fails to produce grayscale antialiasing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40458

           Summary: Font rendering with CAIRO_ANTIALIAS_GRAY fails to
                    produce grayscale antialiasing
           Product: cairo
           Version: 1.10.2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: grumbel at gmx.de
         QAContact: cairo-bugs at cairographics.org


Trying to render a font with simple grayscale anti-aliasing, like:

  cairo_font_options_t* fopts = cairo_font_options_create();
  cairo_font_options_set_subpixel_order(fopts, CAIRO_SUBPIXEL_ORDER_DEFAULT);
  cairo_font_options_set_antialias(fopts, CAIRO_ANTIALIAS_GRAY);
  cairo_set_font_options(cr, fopts);

fails to work. The options are ignored and instead the resulting rendering will
produce results identical with CAIRO_ANTIALIAS_SUBPIXEL with colored pixel
around the edge instead of grayscale ones.

A simple example program reproducing the problem is attached.

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