Re: Special Characters on Mac Emacs

[Steven Tamm]

ATSUI means a rewrite of a large portion of the display code, with the  
benefit that it will display all unicode characters consistently.  The  
change from the emacs-unicode-2 branch for storing the internals as  
unicode will dramatically reduce the cost of implementing this feature.

However, I'm having much difficulty in keeping the font specificationss  
consistent between quickdraw and ATSUI (let alone the near  
impossibility of determining glyph widths in a manner that's fast).   
I'll have to write this up and send it around.

-Steven

On Mar 25, 2005, at 9:00 PM, YAMAMOTO Mitsuharu wrote:

> > > > > > On Fri, 25 Mar 2005 16:34:55 +0100, Sébastien Kirche  
> > > > > > <address@hidden> said:
>
> > > I suppose no characters in mule-unicode-2500-33ff is accessible
> > > from QuickDraw Text API that Carbon Emacs is currently using for
> > > drawing text, at least when using with bundled fonts.
>
> > What i can't figure out is that within OSX you can have any unicode
> > char you want providing that the application is unicode compliant
> > and that character is accessible at least from the system character
> > palette.
>
> > But for Emacs there is that strange remapping for parts of the
> > unicode set.  So some chars are ok and some not.
>
> Quote from "Internationalizing Your Software: File Encodings and  
> Fonts":
> http://developer.apple.com/documentation/MacOSX/Conceptual/ 
> BPInternational/Concepts/FileEncodings.html
>
>   Carbon and QuickDraw Issues
>
>   If you have existing QuickDraw code and want to draw text, you
>   should be aware that the QuickDraw Text routines do not directly
>   support Unicode.
>                                   :
>   The fonts that are installed with Mac OS X have large character sets
>   supporting a wide range of encodings and scripts. For example,
>   Lucida, the system font, supports extended Latin, Greek, Cyrillic,
>   Arabic, Hebrew, and Thai. But if you draw text through QuickDraw
>   Text, you have access only to the MacRoman repertoire. To access the
>   rest, you must use Cocoa or ATSUI.
>
> Steven Tamm is working on ATSUI support, and he is planning to add it
> to the unicode branch.  I also think that it is not time to add such a
> drastic change into the upcoming release version.  My change about
> Central European and Cyrillic display support is a "stopgap" that is
> intended not to change existing mechanisms.
>
>                                      YAMAMOTO Mitsuharu
>                                 address@hidden
>
>
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