[cairo-bugs] [Bug 4792] New: CAIRO_ANTIALIAS_GRAY font option doesn't turn off subpixel rendering

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https://bugs.freedesktop.org/show_bug.cgi?id=4792          
     
           Summary: CAIRO_ANTIALIAS_GRAY font option doesn't turn off
                    subpixel rendering
           Product: cairo
           Version: 1.0.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ft font backend
        AssignedTo: otaylor at redhat.com
        ReportedBy: irkheikk at cs.helsinki.fi
         QAContact: cairo-bugs at cairographics.org


Setting context's font_options->antialias to CAIRO_ANTIALIAS_GRAY leaves
FT_LOAD_TARGET_LCD on in cairo-ft-font.c. 

This causes FT to load the glyphs with subpixel antialiasing. 

Manually zeroing the FT_LOAD_TARGET_LCD flag from load_flags in
_cairo_ft_scaled_font_create_toy made it use grayscale antialiasing.

Quick hack workaround is to do something like this before the call to
_cairo_ft_scaled_font_create:

    if (options->antialias == CAIRO_ANTIALIAS_GRAY)
      load_flags &= !FT_LOAD_TARGET_LCD;

I don't know where the correct place to do the flag zeroing is (ie. what
function is responsible.)          
     
     
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