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Re: Fonts



At 11:18 AM -0500 6/29/03, Chris Scharver wrote:
Hello,

I like how xterm has the ability to use MacOS X system fonts. The antialiasing can look pretty bad though. It's like the "do not antialias under this size" preferences are not honored. Antialiased 9-point fonts are impossible to read.

I'm trying to incorporate similar font-loading functionality into a library I am porting. I tried to look through the X11 source to see how it's being done, but it feels a little like searching for a needle in a haystack. To add MacOS X font support via FreeType in X11, do I need to use FreeType's Mac-specific API? Using something like FT_GetFont_From_Mac_Name() creates a dependence on CoreFoundation. I cannot seem to properly load a font with that approach. Does Apple's X11 do something like this, or is the font support at a lower level?

The current implementation of the library is limiting. FreeType is used for font loading, but the library only loads fonts by file name from a specific path. I would like to implement a similar find-font-by-name method. I tried something like this:

#ifdef __APPLE__
  /* Locate fonts by name on MacOS X. */
  error = FT_GetFile_From_Mac_Name(fontName, &path, &face_index);
  if (! error) {
    error = FT_New_Face(library, path.name, 0, &face);
    if (error) {
      sprintf(stderr, "ERROR: Unable to create face for %s.\n", path.name);
    }
  } else {
    sprintf(stderr, "ERROR: Unable to get %s font file.\n", fontName);
  }
#else
  if (! (path = _flSearchFont(fontName)))
    return NULL;
  error = FT_New_Face(library, path, 0, &face);
  free(path);
#endif

No errors are reported, but the font doesn't seem to load. I'm not sure if the above approach is even the correct one to use from within X11. Any suggestions?

Someone with better font-fu then me may jump in, but here are some general observations:


1. The Freetype mailing lists are probably the best place for detailed questions. Check out <http://freetype.org/>.

2. Font configuration changed significantly in XFree86 4.3.0/Apple's X11 v1.0. Make sure you are using the latest stuff if you are doing development.

3. Assuming you are up to date, you should be able to just use the standard API's. font-config knows about all the Mac OS X font directories and fc-cache will look for fonts in them. Check out /etc/fonts/fonts.conf.

--Torrey
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 >Re: Fonts (From: Chris Scharver <email@hidden>)



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