Hi Jeremias,
Your suggested format does seem more flexible but implementing this would expand the scope of the
job more than is necessary for me to implement this feature. Then there is also the question of
backwards compatibility... (especially if the <font-triplet/> is scheme is changed/superseded).
I only have the simple requirement to substitute a font reference with a particular standard base 14
font. I am trying to incorporate this feature without spending too much time adding new code or
creating and managing new configuration schemes. If I implement it the way I suggested its maybe
only 1/2 - 1 day of work.
Adrian.
Jeremias Maerki wrote:
Sounds a little fop-dev-ish to me, but here goes:
Sounds to me like you're unhappy with the font substitution rules
built into FOP. If FrutigerLight isn't found, FOP currently switches to
the "any" font which is mapped to "Times" already.
Let's not forget PANOSE information that can "help" doing automatic font
substitution. But that's not available for Type 1 fonts. But if FOP had
a database of such PANOSE records it could map missing fonts to another
font that has similar properties. But in such a case Frutiger would
probably be mapped to Helvetica rather than Times as it's a sans-serif
font.
But I guess you're talking about explicit font substitution.
Rather than targetting base 14 fonts only, I'd look at font substitution
in general as this is getting more important now that we have automatic
font detection. The detected fonts might not always be registered in the
exact way someone would like to use them. An example:
Take "Arial". In Windows you get the Arial font family in normal and
bold font-weight variants. But there's also "Arial Black". FOP currently
does this:
font-family "Arial", triplets:
- font-weight="400" (Arial.tff)
- font-weight="700" (ArialBD.tff)
font-family "Arial Black", triplets:
- font-weight="400" (Ariblk.ttf)
But some people (I, for example) might actually prefer this:
font-family "Arial", triplets:
- font-weight="400" (Arial.tff)
- font-weight="700" (ArialBD.tff)
- font-weight="800" (Ariblk.ttf)
This cannot happen automatically because there's not enough information
in the font files to do something like that reliably.
If I had to make a suggestion to cover both your and my requirement I'd
do something like this:
<font-substitution-catalog>
<substitution>
<from font-family="Arial" font-weight="800..900"/>
<to font-family="Arial Black"/>
</substitution>
<substitution>
<from font-family="FrutigerLight"/>
<to font-family="Times"/>
</substitution>
</font-substitution-catalog>
The values on "from" are used as restrictions for font matching. The
values in "to" specify the values that will be replaced in relation to
the originally matched font triplet. This looks quite similar to what
you proposed but is more versatile.
To play the above through:
font-family="Arial" font-weight="400"
--> font-family="Arial" font-weight="400"
font-family="Arial" font-weight="800"
--> font-family="Arial Black" font-weight="800"
font-family="FrutigerLight" font-weight="400"
--> font-family="Times" font-weight="400"
Please note that our concept of font-triplets is still incomplete in
terms of coverage of the XSL spec. For examples, "font-stretch" is not
respected here. In the end, this should actually be a "font-quadruple".
Better choose a different name. ;-)
WDYT? If you don't get any feedback from any user here I think it's
better to move this to fop-dev as it becomes a design discussion.
On 23.04.2008 14:28:21 Adrian Cumiskey wrote:
Hi all,
As most of you probably already know, you are currently able to map font references to a custom font
as follows :-
<!-- register a particular font -->
<font metrics-url="file:///C:/myfonts/FTL_____.xml" kerning="yes"
embed-url="file:///C:/myfonts/FTL_____.pfb">
<font-triplet name="FrutigerLight" style="normal" weight="normal"/>
</font>
But currently there is no provision for mapping a font reference to a base 14 font. I am looking to
implement this feature and suggest the following configuration :-
<!-- register a font reference 'FrutigerLight' as the base 14 font 'Times' -->
<font base14="Times" style="italic" weight="normal">
<font-triplet name="FrutigerLight" style="italic" weight="normal"/>
</font>
And possibly...
<font base14="Times">
<font-triplet name="FrutigerLight" />
</font>
...could map all flavours of FrutigerLight (style=normal,bold,italic weight=normal,bold) references
to matching base 14 'Times' font flavours? Or should it just default to normal?
Hope some people will find this new feature useful, and any suggestions or feedback on these
suggested configurations would be gratefully appreciated.
Adrian.
Jeremias Maerki
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