Re: Difficulty finding a font file through the libraries

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> On Nov 7, 2021, at 01:22, Lawrence D'Oliveiro <ldo@xxxxxxxxxxxxxxxxxxx> wrote:
> On Sun, 7 Nov 2021 01:41:16 -0500, Michael Brennen wrote:
>> The FC routine called from gs to get the weight is this:
>>     result = FcPatternGetInteger (font, FC_WEIGHT, 0, &weight_fc);
>> My debug messages, slightly modified from the gs debug messages:
>> FC_WEIGHT failed to match on Bahnschrift (and Skia)
>> FC_WEIGHT failed to match on 32764
>> weight_fc is an int where the result is stored; that is what is
>> showing 32764 upon return.
> That is probably just a rubbish uninitialized value. The function is
> probably returning FcResultNoMatch because there is no such entry in
> the pattern.
> Which is odd, because looking further back at the
> gp_enumerate_fonts_init() routine in base/gp_unix.c, it is specifically
> asking for a set of info that includes the weight, from the fonts
> matching a specified pattern.
> Maybe worth trying to dump out the full set of patterns returned, to
> see what is in there?

I have not done that yet, only set up a debug loop in gp_enumerate_fonts_init.c to print the names of the fonts to see what was included.

BTW to do printf() I had to comment this in base/gsio.h:

#undef printf
#define printf Function._printf_.unavailable

>> I quickly become tangled in FC’s fc_pat.c, which is where most of
>> this seems to happen. I am not sure what an ELT is (element?) is; I
>> found where it is retrieved by indexing into some data structure, but
>> I don’t know what that is.
> Seems properties can be multivalued, so you also pass an “id” (actually
> an index) to indicate which value element you want. I normally pass 0.
> ;)

It looks like the FcPatternGetInteger() does pass a 0, or perhaps I am misreading it. Without really understanding what I was seeing in the FC routines, because I have not studied the FC data structures, it seemed odd that such an anomalous value was returned.

>> 	variable: False(s)
> Is this the same Bahnschrift that I found here
> <>? That
> archive has 15 different TTF files in it, and some of them report True
> for this property.

I don’t know what the variable false or true means in a font. I’ve never had occasion to look into font internals.

The file BAHNSCHRIFT.TTF in that archive has the same md5 sum as the bahnschrift.ttf file on the server I am working on. Within some miniscule margin of error, they are the same. :)

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