[Fontconfig] Re: fontconfig support to exclude glyphs from fonts

[Jay Hobson]

Keith,

While I can see the need for a ban on unicode codepoint sets, I think 
many end users will find that horribly difficult to use and set up. With 
the patch that I am providing, you can accomplish the same basic goal 
without nearly as much hardship. I suspect it is easier to look up what 
languages a font supports, than what the unicode codepoint set is.

Additionally, if you ban an entire language from a font, then the 
language will be displayed with a different font and have a better 
chance of looking consistent. If you ban a codepoint set, unless you get 
the entire language coverage, you run the risk of having two fonts 
display your text, which would likely look bad.

I would be happy to help work on a unicode codepoint set ban, but I 
would like to see this patch, or something similar go into fontconfig as 
well.

Thanks,

Jay




Keith Packard wrote:

>On Wed, 2006-06-28 at 16:15 -0700, Jay Hobson wrote:
>
>  
>
>>    The patch adds two new tags to supported XML tag list. The tags work 
>>in conjuction with other tags already present in the library. The tags 
>>require fonts.conf or its included counterparts to be amended, detailing 
>>languages to restrict in specified families. The first added tag "hide" 
>>documents which languages are restricted from use for the family. The 
>>second tag "only" documents which languages the family is allowed to 
>>support.
>>    
>>
>
>We've been discussing this here at Guadec and decided that what we
>really want to do is ban unicode codepoint sets from certain fonts. As
>fontconfig computes said ranges, it should be reasonably easy to add a
>match/edit phase to font scanning and edit the unicode codepoint set
>before creating the cache file. It means that changes to this would
>require manual regeneration of the cache, but it also means that the
>glyphs wouldn't ever be shown from those fonts as higher level libraries
>use that codepoint set to select fonts for each glyph.
>
>  
>
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