[Fontconfig] About FcFreeTypeQueryFace()

[Behdad Esfahbod]

On 01/20/2010 09:40 PM, Nestal Wan wrote:
> I have a FT_Face and I want to get the filename of the file it is
> loaded from. I know that this FT_Face is loaded from one of the font
> in the fontconfig database, so I try to create an FcPattern from and
> FT_Face and do a match. I hope this is exactly what the code do.

I don't think that's possible.  Maybe it is if you dig into FT_Face internals.

behdad


> On Thu, Jan 21, 2010 at 2:06 AM, Behdad Esfahbod <behdad at behdad.org> wrote:
>> Maybe you can explain what you are trying to achieve?
>>
>> The face index can be accessed using face->face_index.  There's no way to get
>> the filename from the face.
>>
>> behdad
>>
>> On 01/20/2010 11:27 AM, Nestal Wan wrote:
>>> Hi,
>>>
>>> I am new to FontConfig. I have a FT_Face and I want to get the
>>> filename and font index from it. I found FcFreeTypeQueryFace() should
>>> be useful. However, what should I put in the second and third
>>> argument? I don't quite understand what is mean by "used solely as
>>> data for pattern elements" as mentioned in the man page. I tried to
>>> put NULL and zero but the call fails. If I put something non-zero, the
>>> call success:
>>>
>>> // something non-null
>>> FcChar8 abc[1] ;
>>>
>>> FcBlanks *b = FcBlanksCreate() ;
>>> FcPattern *p = FcFreeTypeQueryFace( face, abc, 0, b ) ;
>>>
>>> FcChar8 *filename2 ;
>>> FcResult result ;
>>> FcPattern *matched = FcFontMatch( 0, p, &result);
>>>
>>> if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
>>>       std::cout << "oops" << std::endl ;
>>>
>>> int id ;
>>> if (FcPatternGetInteger (matched, FC_INDEX, 0, &id) != FcResultMatch)
>>>       std::cout << "oops2" << std::endl ;
>>>
>>> std::cout << "file is " << filename2 << " " << id << std::endl ;
>>>
>>> It actually works. I want to ask if it is OK to put some dummy
>>> non-null pointer to the function?
>>>
>>> Thanks in advance.
>>>
>>> Nestal
>>> _______________________________________________
>>> Fontconfig mailing list
>>> Fontconfig at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/fontconfig
>>>
>>
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