Beispiel #1
0
        public ushort LookupIndex(int codepoint, int nextCodepoint = 0)
        {
            // https://www.microsoft.com/typography/OTSPEC/cmap.htm
            // "character codes that do not correspond to any glyph in the font should be mapped to glyph index 0."
            ushort ret = 0;

            if (!_codepointToGlyphs.TryGetValue(codepoint, out ret))
            {
                foreach (CharacterMap cmap in _charMaps)
                {
                    ushort gid = cmap.CharacterToGlyphIndex(codepoint);

                    //https://www.microsoft.com/typography/OTSPEC/cmap.htm
                    //...When building a Unicode font for Windows, the platform ID should be 3 and the encoding ID should be 1
                    if (ret == 0 || (gid != 0 && cmap.PlatformId == 3 && cmap.EncodingId == 1))
                    {
                        ret = gid;
                    }
                }

                _codepointToGlyphs[codepoint] = ret;
            }

            // If there is a second codepoint, we are asked whether this is an UVS sequence
            //  -> if true, return a glyph ID
            //  -> otherwise, return 0
            if (nextCodepoint > 0)
            {
                foreach (CharacterMap cmap in _charMaps)
                {
                    if (cmap is CharMapFormat14)
                    {
                        CharMapFormat14 cmap14 = cmap as CharMapFormat14;
                        ushort          gid    = cmap14.CharacterPairToGlyphIndex(codepoint, ret, nextCodepoint);
                        if (gid > 0)
                        {
                            return(gid);
                        }
                    }
                }

                return(0);
            }

            return(ret);
        }
Beispiel #2
0
        private static CharacterMap ReadCharacterMap(BinaryReader input)
        {
            ushort format = input.ReadUInt16();

            switch (format)
            {
            default:
                Utils.WarnUnimplemented("cmap subtable format {0}", format);
                return(new NullCharMap());

            case 0: return(ReadFormat_0(input));

            case 2: return(ReadFormat_2(input));

            case 4: return(ReadFormat_4(input));

            case 6: return(ReadFormat_6(input));

            case 12: return(ReadFormat_12(input));

            case 14: return(CharMapFormat14.Create(input));
            }
        }