Hi, On Fri, 27 Aug 2010 11:26:13 -0400 "Derek Leach" <DLeach@xxxxxxx> wrote: >I have fontconfig and freetype installed, and "working" for rendering >"base" fonts, i.e. the family name is resolved properly, like Arial, and >if the glyph is contained within that font, all the rendering proceeds. > >Now, I need to figure out what is necessary to "properly" implement >glyph fallback ... > >1) What API calls do I use to request fontconfig, given a glyph >index, or character code, to find the font which contains the glyph I >need? To seach a font by fontconfig, the "pattern" object should be created and passed to fontconfig. To check the existence of valid glyph for a specified character code point(s), the query process would be following: 1) create a FcCharSet including target character 1-a) create an empty FcCharSet by FcCharSetCreate() 1-b) add the target characters to the FcCharset by FcCharSetAddChar() 2) create a FcPattern including FcCharSet that we created 2-a) create an empty FcPattern by FcPatternCreate() 2-b) add the FcCharSet to FcPattern by FcPatternAddCharSet() 3) lookup the fonts matching with the pattern by FcFontMatch() 4) finalize FcPattern & FcCharSet after the query. I'm afraid fontconfig can check the existence of valid glyph for specified character code, but cannot answer for specified glyph index. Checking the source freetype/src/fcfreetype.c, the glyph index in FcFreeTypeCharSetAndSpacingForSize() is not exported to out of the function. Also, fontconfig.h defines FcCharSet structure, but I cannot find something like FcGlyphSet. I don't find a fontconfig function taking a glyph index in its argument. It seems that fontconfig can handle the database of the glyph names, but I have no experience. >2) I know fontconfig contains a map of the glyph indices within >the font, Oh, I didn't know. Which data structure has the map of glyph index? Regards, mpsuzuki _______________________________________________ Fontconfig mailing list Fontconfig@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/fontconfig
