Re: [ft-devel] FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH by default?

[Werner LEMBERG]

> Every user of FreeType that I know has once in their lifetime hit
> the bug that with many common CJK fonts, non-CJK characters take
> doublewidth where they should take a single one.  The fix always has
> been to pass FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to FreeType, as the
> fonts have the bit set wrongly.  A "monospace" CJK font is never
> monospace.  It has single-width glyphs, and double-width, hence
> setting global-advance is wrong in the font.
> 
> But since this is such a common issue, I wonder if FreeType should
> simply ignore global advance by default.  Cairo and fontconfig
> always pass that flag to FreeType.  I've seen this bug hit Qt
> before.  And most recently I watched it hit Skia.

I've already pondered about this problem, but I've found no solution
which guarantees backwards compatibility.  Your idea of completely
ignoring this flag didn't come to my mind :-)

Since your suggestion sounds sensible, could you provide a patch?


    Werner