On 2 May 2013, Behdad Esfahbod verbalised:
> On 13-05-02 06:12 AM, Nick Alcock wrote:
>> The call stack of all these regex calls is the same:
>>
>> FcFontMatch
>> FcFontSetMatchInternal
>> FcCompare
>> FcCompareValueList
>> FcCompareFilename
>> FcStrRegexCmp
>>
>> I'm sure some FC_DEBUG value can give useful output to say what value
>> list this is coming from, but the only one I've found that gives
>> anything (FC_DEBUG=2) just gives huge sprays of stuff that's useless for
>> this purpose :/
>
> Well, if you figure out, let us know. Because I cannot reproduce it here,
> unless my search pattern has the "file" element set. Is that what Emacs is
> doing?!
Ah!
Emacs's src/xftfont.c:xftfont_open tries to add, well, a lot. Trimmed to
contain only the FcPattern* calls:
pat = FcPatternCreate ();
FcPatternAddInteger (pat, FC_WEIGHT, FONT_WEIGHT_NUMERIC (entity));
FcPatternAddInteger (pat, FC_SLANT, i);
FcPatternAddInteger (pat, FC_WIDTH, FONT_WIDTH_NUMERIC (entity));
FcPatternAddDouble (pat, FC_PIXEL_SIZE, pixel_size);
val = AREF (entity, FONT_FAMILY_INDEX);
if (! NILP (val))
FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
val = AREF (entity, FONT_FOUNDRY_INDEX);
if (! NILP (val))
FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
val = AREF (entity, FONT_SPACING_INDEX);
if (! NILP (val))
FcPatternAddInteger (pat, FC_SPACING, XINT (val));
val = AREF (entity, FONT_DPI_INDEX);
if (! NILP (val))
{
double dbl = XINT (val);
FcPatternAddDouble (pat, FC_DPI, dbl);
}
val = AREF (entity, FONT_AVGWIDTH_INDEX);
if (INTEGERP (val) && XINT (val) == 0)
FcPatternAddBool (pat, FC_SCALABLE, FcTrue);
/* This is necessary to identify the exact font (e.g. 10x20.pcf.gz
over 10x20-ISO8859-1.pcf.gz). */
FcPatternAddCharSet (pat, FC_CHARSET, ftfont_get_fc_charset (entity));
xftfont_add_rendering_parameters (pat, entity);
FcPatternAddString (pat, FC_FILE, (FcChar8 *) SDATA (filename));
FcPatternAddInteger (pat, FC_INDEX, XINT (idx));
So, yes, the filename *is* unconditionally added. I don't know enough
about the Emacs Xft-handling code to know why, yet. (I'm not even sure
where that filename ultimately comes from...)
--
NULL && (void)
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