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Petr Gajdos

2012-Feb-22 14:46 UTC

[Fontconfig] Understanding <default> alias

Hi list,

only as example to figure out how fontconfig''s 
<alias><family>...</family><default>...</default></alias>
works, I put myself into following situation:

I have installed (on changeroot) Droid fonts, Liberation 
fonts and STIXGeneral fonts, no other fonts.

I emptyed all configuration, but I added:
       <alias binding="same">
                <family>myserif</family>
                <accept>
                        <family>DejaVu Serif</family>
                        <family>STIXGeneral</family>
                        <family>Droid Serif</family>
                        <family>Liberation Serif</family>
                </accept>
        </alias>

        <alias binding="same">
                <family>Droid Serif</family>
               
<default><family>myserif</family></default>
        </alias>
        
        <alias binding="same">
                <family>DejaVu Serif</family>
               
<default><family>myserif</family></default>
        </alias>

        <alias binding="same">
                <family>Liberation Serif</family>
               
<default><family>myserif</family></default>
        </alias>

        <alias binding="same">
                <family>STIXGeneral</family>
               
<default><family>myserif</family></default>
        </alias>

I wanted to have all Serif fonts grouped together in myserif and
whenever any of them that is not installed (DejaVu Serif in this case)
is requested, fc-match would return first available from 
<accept></accept> block of myserif alias. (I wanted to somewhat
simplify the situation in 30-metric-aliases.conf.)

But it seems that I either misunderstand <default></default> purpose
or I do other thing wrong: fc-match "myserif" returns STIXGeneral as
expected, but  fc-match "DejaVu Serif" returns

LiberationMono-Regular.ttf: "Liberation Mono" "Regular"


What I am missing? What''s the exact meaning of <default> alias?

Any help is appreciated!
Petr

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Akira TAGOH

2012-Feb-23 04:13 UTC

head link

[Fontconfig] Understanding <default> alias

# I forgot to Cc''ing the list. resending....

Hi,

Once building the pattern list for lookup, it won''t be re-evaluated
for matching. thus, what you need to do for what you want to do is to
add the fallback fonts as you did for "myserif". it''s the
same logic
to how fontconfig deals with the virtual family names like sans-serif,
serif, monospace and so on.

On Wed, Feb 22, 2012 at 11:46 PM, Petr Gajdos <pgajdos at suse.cz>
wrote:> Hi list,
>
> only as example to figure out how fontconfig''s
>
<alias><family>...</family><default>...</default></alias>
> works, I put myself into following situation:
>
> I have installed (on changeroot) Droid fonts, Liberation
> fonts and STIXGeneral fonts, no other fonts.
>
> I emptyed all configuration, but I added:
> ? ? ? <alias binding="same">
> ? ? ? ? ? ? ? ?<family>myserif</family>
> ? ? ? ? ? ? ? ?<accept>
> ? ? ? ? ? ? ? ? ? ? ? ?<family>DejaVu Serif</family>
> ? ? ? ? ? ? ? ? ? ? ? ?<family>STIXGeneral</family>
> ? ? ? ? ? ? ? ? ? ? ? ?<family>Droid Serif</family>
> ? ? ? ? ? ? ? ? ? ? ? ?<family>Liberation Serif</family>
> ? ? ? ? ? ? ? ?</accept>
> ? ? ? ?</alias>
>
> ? ? ? ?<alias binding="same">
> ? ? ? ? ? ? ? ?<family>Droid Serif</family>
> ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> ? ? ? ?</alias>
>
> ? ? ? ?<alias binding="same">
> ? ? ? ? ? ? ? ?<family>DejaVu Serif</family>
> ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> ? ? ? ?</alias>
>
> ? ? ? ?<alias binding="same">
> ? ? ? ? ? ? ? ?<family>Liberation Serif</family>
> ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> ? ? ? ?</alias>
>
> ? ? ? ?<alias binding="same">
> ? ? ? ? ? ? ? ?<family>STIXGeneral</family>
> ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> ? ? ? ?</alias>
>
> I wanted to have all Serif fonts grouped together in myserif and
> whenever any of them that is not installed (DejaVu Serif in this case)
> is requested, fc-match would return first available from
> <accept></accept> block of myserif alias. (I wanted to somewhat
> simplify the situation in 30-metric-aliases.conf.)
>
> But it seems that I either misunderstand <default></default>
purpose
> or I do other thing wrong: fc-match "myserif" returns STIXGeneral
as
> expected, but ?fc-match "DejaVu Serif" returns
>
> LiberationMono-Regular.ttf: "Liberation Mono" "Regular"
>
>
> What I am missing? What''s the exact meaning of <default>
alias?
>
> Any help is appreciated!
> Petr
>
>
> _______________________________________________
> Fontconfig mailing list
> Fontconfig at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/fontconfig
>


-- 
Akira TAGOH

Petr Gajdos

2012-Feb-23 10:15 UTC

head link

[Fontconfig] Understanding <default> alias

On Thu, Feb 23, 2012 at 01:13:42PM +0900, Akira TAGOH
wrote:> # I forgot to Cc''ing the list. resending....
> 
> Hi,
> 
> Once building the pattern list for lookup, it won''t be
re-evaluated
> for matching. thus, what you need to do for what you want to do is to
> add the fallback fonts as you did for "myserif". it''s
the same logic
You mean <accept></accept> block for every font in the group? I am
searching for more scalable solution and, mainly, for
<default></default> usage :-) (is there any other?).

Nevertheless, I have probably found it: I didn''t preserve sequence of
<alias><family></family><accept></accept></alias>
and
<alias><family></family><default></default></alias>
from
30-metric-aliases.conf -- I haven''t consider it important until now (I
have no idea why it matters, I don''t know internals of fontconfig).

        <alias binding="same">
                <family>Droid Serif</family>
                <family>DejaVu Serif</family>
                <family>Liberation Serif</family>
                <family>STIXGeneral</family>
               
<default><family>myserif</family></default>
        </alias>

        <alias binding="same">
                <family>myserif</family>
                <accept>
                        <family>DejaVu Serif</family>
                        <family>STIXGeneral</family>
                        <family>Droid Serif</family>
                        <family>Liberation Serif</family>
                </accept>
        </alias>

works as I expect. I. e.

laura:/> fc-list | grep "DejaVu Serif"
laura:/> fc-match "DejaVu Serif"
STIXGeneral.otf: "STIXGeneral" "Regular"

Note that, for <default> alias, it make sense to have more 
<family> tags in.


Petr
> > ? ? ? <alias binding="same">
> > ? ? ? ? ? ? ? ?<family>myserif</family>
> > ? ? ? ? ? ? ? ?<accept>
> > ? ? ? ? ? ? ? ? ? ? ? ?<family>DejaVu Serif</family>
> > ? ? ? ? ? ? ? ? ? ? ? ?<family>STIXGeneral</family>
> > ? ? ? ? ? ? ? ? ? ? ? ?<family>Droid Serif</family>
> > ? ? ? ? ? ? ? ? ? ? ? ?<family>Liberation Serif</family>
> > ? ? ? ? ? ? ? ?</accept>
> > ? ? ? ?</alias>
> >
> > ? ? ? ?<alias binding="same">
> > ? ? ? ? ? ? ? ?<family>Droid Serif</family>
> > ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> > ? ? ? ?</alias>
> >
> > ? ? ? ?<alias binding="same">
> > ? ? ? ? ? ? ? ?<family>DejaVu Serif</family>
> > ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> > ? ? ? ?</alias>
> >
> > ? ? ? ?<alias binding="same">
> > ? ? ? ? ? ? ? ?<family>Liberation Serif</family>
> > ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
> > ? ? ? ?</alias>
> >
> > ? ? ? ?<alias binding="same">
> > ? ? ? ? ? ? ? ?<family>STIXGeneral</family>
> > ? ? ? ? ? ? ?
?<default><family>myserif</family></default>
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Petr Gajdos

2012-Feb-24 10:42 UTC

head link

[Fontconfig] Understanding <default> alias

Hi,

On Thu, Feb 23, 2012 at 11:15:01AM +0100, Petr Gajdos
wrote:> have no idea why it matters, I don''t know internals of
fontconfig).I have it now ;-).
> Note that, for <default> alias, it make sense to have more 
> <family> tags in.
ok, I have read bug 44826 and 33644; result of

---------------8<------------------
<alias binding="same">
        <family>Droid Sans</family>
        <family>DejaVu Sans</family>
        <family>Liberation Sans</family>
        <default><family>mysans</family></default>
</alias>
--------------->8------------------

is (FC_DEBUG=4)

---------------8<------------------
Add Subst match
        pattern any family Equal "Droid Sans" Comma "DejaVu
Sans" Comma "Liberation Sans"
edit
        Edit family AppendLast "mysans";
--------------->8------------------

How can I achieve it by <match><test><edit> (Comma operator)?

Thanks for your help,
Petr

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Akira TAGOH

2012-Feb-24 10:54 UTC

head link

[Fontconfig] Understanding <default> alias

On Fri, Feb 24, 2012 at 7:42 PM, Petr Gajdos <pgajdos at suse.cz>
wrote:> How can I achieve it by <match><test><edit> (Comma
operator)?
How the syntactic sugar behaves is documented. read fonts.dtd or the
mail archives in this list. it''s the topic sometimes brought up by
someone.

-- 
Akira TAGOH

Fontconfig - Feb 2012 - Understanding <default> alias

[Fontconfig] Understanding <default> alias

[Fontconfig] Understanding <default> alias

[Fontconfig] Understanding <default> alias

[Fontconfig] Understanding <default> alias

[Fontconfig] Understanding <default> alias