Klaus Schmidinger wrote:
> On 06/16/07 16:29, Anssi Hannula wrote:
>> Klaus Schmidinger wrote:
>>> On 06/15/07 18:07, Anssi Hannula wrote:
>>>> Klaus Schmidinger wrote:
>>>>> On 06/10/07 17:53, Anssi Hannula wrote:
>>>>>> ...
>>>>>> Alternatively, you could use the fontconfig library [1] for managing
>>>>>> fonts. This would also allow using using the system default fonts via
>>>>>> aliases like 'sans-serif' etc, and using a font list instead of having
>>>>>> to manually write the font filename via OSD.
>>>>>>
>>>>>> You can get a quick idea from looking at the patch which added
>>>>>> fontconfig support for mplayer [2], though of course you should look in
>>>>>> fontconfig documentation instead of copying conventions from mplayer :)
>>>>>>
>>>>>> [1] http://fontconfig.org/
>>>>>> [2]
>>>>>> http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2003-November/022218.html
>>>>> When I do
>>>>>
>>>>> const char *font_name = "sans-serif";
>>>>> FcInit();
>>>>> FcPattern *fc_pattern = FcNameParse((FcChar8 *)font_name);
>>>> While fontconfig is usually configured to ignore bitmap fonts anyway, I
>>>> think you should enforce that by putting this call here:
>>>> FcPatternAddBool(fc_pattern, FC_SCALABLE, FcTrue);
>>> Thanks.
>> Actually, I was wrong here. This won't guarantee anything, as the
>> preference priorities of parameters is predefined, and the family name
>> and, apparently, various other parameters (which are actually left at
>> their defaults) are given a priority over the font being scalable. I was
>> hit with this when trying to select FC_FAMILY "Utopia", and it kept
>> returning the non-scalable version, even though a scalable version with
>> the same name is available.
>>
>> Solution is given here:
>> http://lists.freedesktop.org/archives/fontconfig/2006-March/002165.html
>>
>> So it is doable, but you have to use FcFontSort() (
>> http://www.xemacs.org/Documentation/packages/html/fontconfig_3.html#SEC20
>> ), which returns a similar FcFontSet as the FcFontList() which is used
>> for the font listing, but this time the fonts are ordered according to
>> the closeness of match, allowing you to pick the first font with
>> FC_SCALABLE being true.
>>
>> [...]
>>
>> I don't know if you have noticed / thought of these already, but few tips:
>> - For the fixed-size font list, you can use a match of FC_SPACING being
>> FC_MONO so that non-monospace fonts are not listed.
>> - Have a "default" (or "system default") font setting in the font list,
>> which causes VDR to use the default aliases instead of user-specified font
>
> Since you're apparently getting more and more familiar with this,
> maybe you could provide a complete code sequence that does this:
>
> - list all available fonts, as in "Arial", "Verdana", "Times New Roman", ...
>
> - optionally list only monospaced fonts
>
> - make sure there are only scalable fonts (i.e. ones that freetype can use)
>
> - if possible, give information on whether a particular font is available
> as "bold" and/or "italic
This function prints all the fonts in a format which can be fed back to
FcNameParse(). AFAICS you only need slant+weight or style, use which one
you prefer.
int printfonts(bool only_monospace, bool slant_and_weight_instead_of_style)
{
FcInit();
FcObjectSet *os;
if (slant_and_weight_instead_of_style)
os = FcObjectSetBuild(FC_FAMILY, FC_SLANT, FC_WEIGHT,
NULL);
else
os = FcObjectSetBuild(FC_FAMILY, FC_STYLE, NULL);
FcPattern *pat = FcPatternCreate();
FcPatternAddBool(pat, FC_SCALABLE, FcTrue);
if (only_monospace)
FcPatternAddInteger(pat, FC_SPACING, FC_MONO);
FcFontSet* fontset = FcFontList(NULL, pat, os);
FcObjectSetDestroy(os);
FcPatternDestroy(pat);
for (int i = 0; i < fontset->nfont ; i++) {
printf("%s\n", FcNameUnparse(fontset->fonts[i]));
}
FcFontSetDestroy(fontset);
FcFini();
}
Here's a function that prints the font name when inputted with a string
outputted by printfonts(), or NULL if not found:
void getfontfilename(char* identifier, char **filename)
{
FcPattern *pat = FcNameParse((FcChar8*)identifier);
FcPatternAddBool(pat, FC_SCALABLE, FcTrue);
FcConfigSubstitute(NULL, pat, FcMatchPattern);
FcDefaultSubstitute(pat);
FcFontSet* fontset = FcFontSort(NULL, pat, FcFalse, NULL, NULL);
FcPatternDestroy(pat);
FcBool scalable;
*filename = NULL;
for (int i = 0; i < fontset->nfont; i++) {
FcPatternGetBool(fontset->fonts[i], FC_SCALABLE, 0,
&scalable);
if (scalable) {
FcPatternGetString(fontset->fonts[i], FC_FILE,
0, (FcChar8**)filename);
break;
}
}
FcFontSetDestroy(fontset);
}
>
> From the setup menu I'd like to be able to call a function that delivers
> a list of font names (much like it's currently done with the actual font
> file names) that looks like
>
> Arial
> Arial:bold
> Arial:italic
> Arial:bold:italic
> Verdana
> Verdana:bold
> Verdana:italic
> ...
>
> I would prepend that list with
>
> sans-serif:bold
> sans-serif
> courier:bold
Probably monospace:bold instead of courier:bold.
> for the three default fonts.
>
> Finally, such a string should be useable to select an actual font file.
--
Anssi Hannula
_______________________________________________
vdr mailing list
[email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr
