Re: Font fallback mechanism

[Yen-Ju Chen]

> From: Adam Fedor <fedor@doc.com>
> To: Yen-Ju Chen <yjchenx@hotmail.com>
> CC: discuss-gnustep@gnu.org
> Subject: Re: Font fallback mechanism
> Date: Thu, 22 Aug 2002 08:29:37 -0600
>
> Yen-Ju Chen wrote:
> >  Here is what I thought:
> >  There are two situations which font fallback will be useful.
> >  The simple one is that every NSString contain only one kind of script,
> >  but the whole application (or different applications) contain different 
> > script.
> >  The other one is that every NSString might contain more than one script.
> >
> >  For the first situation, since preferredFontNames is a class methods,
> >  maybe user can add a NSPrefferedFont = (Times, MingTi); in 
> > .GNUstepDefaults.
> >  Then in drawRun: of NSStringDrawing, it will try to use
> >  the specified font (NSFont, NSUserFont, ...) to convert
> >  the encoding strictly (using GSUniStrict flag instead).
> >  If it won't work, it will try every preferredFontName with GSUniStrict 
> > flag.
> >  If all of them won't work, it will go back to use the specified font 
> > again
> >  without GSUniStrict as what it does right now.
> >  This should be easy to implement but involve several classes.
> >  As long as the list of preferredFont is short
> >  and the majority of strings are the same script,
> >  it should work efficiently.
> This sounds fine with me, if you'd like to try to implement it (at least 
> the first situation for now, which sounds easier).

 After the first try, I found it is impossible for now.
 For example, if both the english font and Chinese font are iso10646-1,
 when GNUstep read a Chinese string in iso10646-1,
 it will think the english font is also iso10646-1,
 and use this english font to display this Chinese string.
 The encoding is right, but the english font
 doesn't contain these Chinese script.

 The only way I know is to really look at each font,
 and find out what script it supports.
 So even all the fonts are iso10646-1,
 some support only from 1-256, some from 1-65536, etc.
 I remember Unicode defines which segment is for which language.
 I need to check it out.
 And it will take more work than I thought.

> I was wondering if you would also like to write some (short) documentation 
> on how a user can set up GNUstep for multiple languages (and perhaps how a 
> developer can program for it)? It would be good for me since I don't know 
> much about it. Thanks

 Here is the first draft:
 http://www.people.virginia.edu/~yc2w/GNUstep/english/chinese.html
 This is from what I remembered.
 I need to check each step again,
 but generally it works.

 Yen-Ju

> --
> Adam Fedor, Digital Optics Corp.      | I'm glad I hate spinach, because
> http://www.doc.com                    | if I didn't, I'd eat it, and you
>                                       | know how I hate the stuff.
>
>
>
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