[Fontconfig-bugs] [Bug 63096] webfonts support?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63096

Behdad Esfahbod <freedesktop at behdad.org> changed:

           What    |Removed                     |Added
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                 CC|                            |freedesktop at behdad.org

--- Comment #1 from Behdad Esfahbod <freedesktop at behdad.org> ---
(In reply to comment #0)
> firefox is calling FcFreeTypeQueryFace for webfonts like this:
> 
>         pattern =
>             (*sQueryFacePtr)(mFace, gfxFontconfigUtils::ToFcChar8(""), 0,
> NULL);
> 
> This fails now because we require the valid filename to generate hash value
> and if not, simply fails because the matcher behaves wrong if some objects
> are available or unavailable in the cache.

In FcFreeTypeQueryFace (as opposed to FcFreeTypeQuery) we should use
FT_Load_Sfnt_Table() to get the font data and hash that.

> One idea to support this case is to define constant value and add an invalid
> hash to the cache?
> 
> FWIW FcPatternDel should warn if one is going to delete objects which is in
> the matcher perhaps.

Humm.  Not sure about that.

The matcher should not fail if something is missing.  It should simply not
match.

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