[cairo-bugs] [Bug 12787] New: Use a larger scaled glyph cache for CJK languages

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=12787

           Summary: Use a larger scaled glyph cache for CJK languages
           Product: cairo
           Version: 1.5.1
          Platform: Other
               URL: http://www.gnome.org/~federico/news-2007-10.html#pango-
                    cjk-1
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: federico at ximian.com
         QAContact: cairo-bugs at cairographics.org
                CC: pwu at novell.com


Profiles indicate that for CJK languages, glyphs get scaled too frequently
because the default cache is too small:

http://www.gnome.org/~federico/news-2007-10.html#pango-cjk-1

cairo-scaled-font.c has this:
#define MAX_GLYPHS_CACHED_PER_FONT 256

and it includes a comment that it would be better to have a cache shared across
all fonts, with a random replacement policy.

Simply increasing this value to 2048 gives very good results; with the
pango-profile benchmark, scaling glyphs went from using about 60% of the time
to only using about 13%.

This bug is a reminder that a cache shared across shared fonts is desirable.


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