In fact, I said something wrong: Ubuntu 18.04 and Debian have not the
same version of fontconfig:
fontconfig version under Ubuntu 18.04 is 2.12.6
fontconfig version under Debian 10 is 2.13.1
and something has changed for font weight between these two versions:
I looked at source code and saw that
fcobjs.h - version 2.12.6 says "FC_OBJECT (WEIGHT, FcTypeInteger,
FcCompareNumber)"
and that
fcobjs.h - version 2.13.1 says "FC_OBJECT (WEIGHT, FcTypeRange,
FcCompareRange)"
So I think it implies that WEIGHT is yet of type FcTypeRange
In this case, how to get weight property of a FcPattern ?
Le 10/09/2019 à 14:36, Lucien Gentis a écrit :
Thanks for your reply, Mr D'Oliveiro
So I tried to replace "Liberation Sans:style=Bold Italic" by
"Liberation Sans:weight=bold:slant=italic" in my C program, but under
Debian 10 , I still get:
font family : Liberation Sans
font weight : 0
font slant : 100
Family and slant are OK, only weight is false.
Same program under Linux Ubuntu 18.04 gives :
font family : Liberation Sans
font weight : 200
font slant : 100
Le 10/09/2019 à 00:52, Lawrence D'Oliveiro a écrit :
On Mon, 9 Sep 2019 18:11:03 +0200, Lucien Gentis wrote:
const char * newFont="Liberation Sans:style=Bold Italic";
...
I think what you are seeing is the difference in the way Fontconfig
interprets different pattern specs. Using my Python binding
<https://github.com/ldo/python_fontconfig>, and recreating what you are
doing:
>>> f = fc.Pattern.name_parse("Liberation Sans:style=Bold Italic")
>>> f.get("family", 0)
('Liberation Sans', 0)
>>> f.get("style", 0)
('Bold Italic', 0)
>>> f.get("weight", 0)
(None, 1)
>>> f.get("slant", 0)
(None, 1)
The second number in the result tuples is the status code; the nonzero
value is FcResultNoMatch for the weight and slant. But if I write the
pattern this way:
>>> f = fc.Pattern.name_parse("Liberation
Sans:weight=bold:slant=italic")
>>> f.get("family", 0)
('Liberation Sans', 0)
>>> f.get("style", 0)
(None, 1)
>>> f.get("weight", 0)
(200.0, 0)
>>> f.get("slant", 0)
(100, 0)
Now you see that the pattern has no style property, but it does have a
weight and slant. Because that is what I specified. The first variant
has a style, but no weight or slant, again because that is what I
specified.
Remember, this is just the search pattern. Once you use this to find an
actual font, you should get a lot more info back from the matching
instance pattern.
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