[bug #17787] Unimplemented methods of NSFont and patch

[Yen-Ju Chen]

URL:
  <http://savannah.gnu.org/bugs/?17787>

                 Summary: Unimplemented methods of NSFont and patch
                 Project: GNUstep
            Submitted by: yjchen
            Submitted on: Monday 09/18/2006 at 00:13
                Category: Backend
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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Details:

Two methods have no implementation in NSFont:
- (unsigned) numberOfGlyphs
- (NSCharacterSet*) coveredCharacterSet

Here is code to get these information from font in art backend,
which use FreeType:

  
  {
    // FT_Face *pface;
    NSLog(@"Face 0x%x", pface);
    NSLog(@"Number of glyphs %d", (*pface)->num_glyphs);

    FT_ULong charcode; /* Char index */
    FT_UInt gindex; /* Glyph index */
    charcode = FT_Get_First_Char(*pface, &gindex);
    while (gindex != 0)
    {
      charcode = FT_Get_Next_Char(*pface, charcode, &gindex);
      NSLog(@"Char %c(%ld), Glyph %d", charcode, charcode, gindex);
    }
  }

I don't know where to use the code and have the information
back to NSFont.
I test it in back/art/Source/ftfont.m:
static FT_Error ft_get_face(FTC_FaceID fid, FT_Library lib, FT_Pointer data,
FT_Face *pface)
As long as FT_Face is available, 
these information can be obtained anywhere.

Maybe someone knows better where to put it.
And I don't know how fast to go through all characters,
especially for CJK users.
Maybe a cache would be nice.







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