[devel] XLFD font naming convention
lucien.gentis at univ-lorraine.fr
Tue Mar 5 18:03:28 UTC 2019
Le 04/03/2019 à 19:09, Ilya Anfimov a écrit :
> On Mon, Mar 04, 2019 at 07:03:00PM +0100, Lucien Gentis wrote:
>> Le 04/03/2019 `a 18:18, Ilya Anfimov a ecrit :
>> "For a scalable font source, a scalable font name for each
>> character set is included in the list. In addition to
>> the scalable font name, specific derived instance names
>> may also be included in the list."
>> "Because some existing applications rely on seeing a collection
>> of point and pixel sizes, server vendors are strongly
>> encouraged in the near term to provide a mechanism for
>> including, for each scalable font name, a set of specific
>> derived instance names. For font sources that contain a set of
>> specific derived instance names."
>> So it is OK to have that in font list. It must be --0-0- base
>> name for every such font, and if it is not -- there is an error
>> somewhere in your X server or font server, and probably should be
>> fixed. If there are base entries -- then you don't need them.
>> I don't really need it, existing choice is big enough !
> Probably you somewhat misread my description.
> It should be not big enough, it should contain all that fonts
> with proper fields zeroed.
> If it does not -- it is some error in server.
>> But I only wanted to know the signification of "0" field in -adobe-new
>> century schoolbook-bold-r-normal--0-120-100-100-p-0-iso10646-1
>> I did these (easy to reproduce) tests with xfontsel and xlsfonts commands
>> xfontsel :
>> - if we select a point size of 120, it's impossible to select a pixel size
>> of 0
>> - if we select a pixel size of 0, we only have the choice between * or 0
>> for point size
>> xlsfonts :
>> - xlsfonts -fn "-*-*-*-*-*-*-0-*-*-*-*-*-*-*" (pixel size of 0) : we can
>> see scalable fonts and fonts like -adobe-new century
>> - xlsfonts -fn "-*-*-*-*-*-*-0-120-*-*-*-*-*-*" (pixel size of 0, point
>> size of 120) : we can see fonts like -adobe-new century
>> - xlsfonts -fn "-*-*-*-*-*-*-*-120-*-*-*-*-*-*" (point size of 120) :we
>> don't see anymore fonts like -adobe-new century
>> schoolbook-bold-r-normal--0-120-100-100-p-0-iso10646-1, which is confusing
>> because "-*-120-" also matches "-0-120-"
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There is no server error.
The answer is at the end of chapter 5 of
where it is said:
"if the actual pattern argument (of ListFonts X query) has values
containing no wildcards in scalable fields, then substitute each such
field into the corresponding field in each scalable font name in the list."
So as I understand, if we call xlsfonts -fn
"-*-*-*-*-*-*-0-0-*-*-*-0-*-*" (Pixel size, point size and average width
at 0), we get all scalable fonts, and if we call xlsfonts -fn
"-*-*-*-*-*-*-0-138-*-*-*-*-*-*" (Pixel size at 0 and point size of 138)
or xlsfonts -fn "-*-*-*-*-*-*-*-138-*-*-*-0-*-*" (Point size of 138 and
average size at 0), we get all scalable font *instances* with a point
size of 138 and some default resolutions.
120 seems to be something like a default point size value and 17 a
default pixel size when these values are not specified. try to call
xlsfonts -fn "-*-*-*-*-*-*-0-*-*-*-*-*-*-*" or xlsfonts -fn
I already thank you Ilya for your help and spoting to the XLFD doc that
is not easy to find
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