Exemple #1
0
        private static int LoadSubTable(FontParser parser, int start, FontFace font, Glyph[] glyphs)
        {
            // Total characters in subtable:
            int characterCount = 0;

            // Seek to the cmap now:
            parser.Position = start;

            // Check it's format 4:
            int format = parser.ReadUInt16();

                        #if INFINITEXT_DEBUG
            Fonts.OnLogMessage("Cmap subtable format: " + format);
                        #endif

            if (format > 13)
            {
                // We now have e.g. 14.0 - ulong here ("Length"):
                parser.Position += 4;
            }
            else if (format > 6)
            {
                // We now have e.g. 12.0 - another short here (reserved):
                parser.Position += 2;

                // Length and language are both 4 byte ints now:
                parser.Position += 8;
            }
            else
            {
                // Size of the sub-table (map length, u16):
                parser.Position += 2;

                // Structure of the sub-table (map language, u16):
                parser.Position += 2;
            }

            switch (format)
            {
            case 0:

                // Byte encoding table:

                for (int i = 0; i < 256; i++)
                {
                    int rByte = parser.ReadByte();

                    Glyph glyph = glyphs[rByte];

                    if (glyph != null)
                    {
                        characterCount++;

                        glyph.AddCharcode(i);
                    }
                }

                break;

            case 2:

                // The offset to the headers:
                int subOffset = parser.Position + (256 * 2);

                // For each high byte:
                for (int i = 0; i < 256; i++)
                {
                    // Read the index to the header and zero out the bottom 3 bits:
                    int headerPosition = subOffset + (parser.ReadUInt16() & (~7));

                    // Read the header:
                    int   firstCode  = parser.ReadUInt16(ref headerPosition);
                    int   entryCount = parser.ReadUInt16(ref headerPosition);
                    short idDelta    = parser.ReadInt16(ref headerPosition);

                    // Grab the current position:
                    int pos = headerPosition;

                    // Read the idRangeOffset - the last part of the header:
                    pos += parser.ReadUInt16(ref headerPosition);

                    int maxCode = firstCode + entryCount;

                    // Get the high byte value:
                    int highByte = (i << 8);

                    // For each low byte:
                    for (int j = firstCode; j < maxCode; j++)
                    {
                        // Get the full charcode (which might not actually exist yet):
                        int charCode = highByte + j;

                        // Read the base of the glyphIndex:
                        int p = parser.ReadUInt16(ref pos);

                        if (p == 0)
                        {
                            continue;
                        }

                        p = (p + idDelta) & 0xFFFF;

                        if (p == 0)
                        {
                            continue;
                        }

                        Glyph glyph = glyphs[p];

                        if (glyph != null)
                        {
                            characterCount++;

                            glyph.AddCharcode(charCode);
                        }
                    }
                }

                break;

            case 4:

                // Segment count. It's doubled.
                int segCount = (parser.ReadUInt16() >> 1);

                // Search range, entry selector and range shift (don't need any):
                parser.Position += 6;

                int baseIndex = parser.Position;

                int endCountIndex = baseIndex;

                baseIndex += 2;

                int startCountIndex    = baseIndex + segCount * 2;
                int idDeltaIndex       = baseIndex + segCount * 4;
                int idRangeOffsetIndex = baseIndex + segCount * 6;

                for (int i = 0; i < segCount - 1; i++)
                {
                    int endCount      = parser.ReadUInt16(ref endCountIndex);
                    int startCount    = parser.ReadUInt16(ref startCountIndex);
                    int idDelta       = parser.ReadInt16(ref idDeltaIndex);
                    int idRangeOffset = parser.ReadUInt16(ref idRangeOffsetIndex);

                    for (int c = startCount; c <= endCount; c++)
                    {
                        int glyphIndex;

                        if (idRangeOffset != 0)
                        {
                            // The idRangeOffset is relative to the current position in the idRangeOffset array.
                            // Take the current offset in the idRangeOffset array.
                            int glyphIndexOffset = (idRangeOffsetIndex - 2);

                            // Add the value of the idRangeOffset, which will move us into the glyphIndex array.
                            glyphIndexOffset += idRangeOffset;

                            // Then add the character index of the current segment, multiplied by 2 for USHORTs.
                            glyphIndexOffset += (c - startCount) * 2;

                            glyphIndex = parser.ReadUInt16(ref glyphIndexOffset);

                            if (glyphIndex != 0)
                            {
                                glyphIndex = (glyphIndex + idDelta) & 0xFFFF;
                            }
                        }
                        else
                        {
                            glyphIndex = (c + idDelta) & 0xFFFF;
                        }

                        // Add a charcode to the glyph now:
                        Glyph glyph = glyphs[glyphIndex];

                        if (glyph != null)
                        {
                            characterCount++;

                            glyph.AddCharcode(c);
                        }
                    }
                }

                break;

            case 6:

                int firstCCode  = parser.ReadUInt16();
                int entryCCount = parser.ReadUInt16();

                for (int i = 0; i < entryCCount; i++)
                {
                    Glyph glyphC = glyphs[parser.ReadUInt16()];

                    if (glyphC != null)
                    {
                        characterCount++;

                        glyphC.AddCharcode(firstCCode + i);
                    }
                }

                break;

            case 10:

                // Trimmed array. Similar to format 6.

                int startCharCode = parser.ReadUInt16();
                int numChars      = parser.ReadUInt16();

                for (int i = 0; i < numChars; i++)
                {
                    Glyph glyphC = glyphs[parser.ReadUInt16()];

                    if (glyphC != null)
                    {
                        characterCount++;

                        glyphC.AddCharcode(startCharCode + i);
                    }
                }

                break;

            case 12:

                // Segmented coverage.
                // Mapping of 1 charcode to 1 glyph. "Segmented" because it can come in blocks called groups.

                int groups = (int)parser.ReadUInt32();

                // For each group of glyphs..
                for (int i = 0; i < groups; i++)
                {
                    // Start/end charcode:
                    int startCode = (int)parser.ReadUInt32();
                    int endCode   = (int)parser.ReadUInt32();

                    // Start glyph ID:
                    int startGlyph = (int)parser.ReadUInt32();

                    int count = (endCode - startCode);

                    // For each glyph/charcode pair..
                    for (int j = 0; j <= count; j++)
                    {
                        // Get the glyph:
                        int glyphIndex = (startGlyph + j);

                        Glyph glyph = glyphs[glyphIndex];

                        if (glyph != null)
                        {
                            characterCount++;

                            // Charcode is..
                            glyph.AddCharcode(startCode + j);
                        }
                    }
                }

                break;

            case 13:

                // Many to one. Same format as #12 but the meaning is a bit different.

                // How many groups?
                int glyphCount = (int)parser.ReadUInt32();

                for (int i = 0; i < glyphCount; i++)
                {
                    int startCode = (int)parser.ReadUInt32();
                    int endCode   = (int)parser.ReadUInt32();
                    int glyphID   = (int)parser.ReadUInt32();

                    // Get the glyph:
                    Glyph glyph = glyphs[glyphID];

                    if (glyph != null)
                    {
                        int count = (endCode - startCode);

                        // For each charcode..
                        for (int j = 0; j <= count; j++)
                        {
                            characterCount++;

                            // Hook up glyph to this charcode:
                            glyph.AddCharcode(startCode + j);
                        }
                    }
                }

                break;

            case 14:

                Fonts.OnLogMessage("InfiniText partially supports part of the font '" + font.Family.Name + "' - this is harmless. Search for this message for more.");

                // This font contains a format 14 CMAP Table.
                // Format 14 is "Unicode variation selectors" - essentially different versions of the same character.
                // E.g. a text Emoji character and a graphical one.
                // In a text system like InfiniText, that just means we must map a bunch of different charcodes
                // to the same glyph.

                // .. I Think! As usual, the OpenType spec doesn't make too much sense.
                // However, it appears to be entirely optional.

                // So, approx implementation is below, however getting the utf32 code point from the variation + base character
                // is completely undocumented - my best guess unfortunately threw errors.

                // See the commented out block below!

                break;

            /*
             *
             * case 14:
             *
             * // How many var selector records?
             * int records=(int)parser.ReadUInt32();
             *
             * for(int i=0;i<records;i++){
             *
             *      // variation selector:
             *      int varSelector=(int)parser.ReadUInt24();
             *
             *      // Offsets:
             *      int defaultUVSOffset=(int)parser.ReadUInt32();
             *      int nonDefaultUVSOffset=(int)parser.ReadUInt32();
             *
             *      // Grab parser position:
             *      int position=parser.Position;
             *
             *      // Got a ref to a default style table?
             *      if(defaultUVSOffset!=0){
             *
             *              // Yep! The UVS is simply a list of "base" characters, each with ranges of available charcodes.
             *              // [BaseCharCode][The extended part. Each of these comes from the range.]
             *              // The actual glyph is the one that we get by directly looking up each of the base characters.
             *
             *              // Seek to the table:
             *              parser.Position=start+defaultUVSOffset;
             *
             *              // Read the unicode value ranges count:
             *              int numUniRangesCount=(int)parser.ReadUInt32();
             *
             *              // For each one..
             *              for(int m=0;m<numUniRangesCount;m++){
             *
             *                      // Read the base charcode:
             *                      int baseCharcode=(int)parser.ReadUInt24();
             *
             *                      // Read the size of the range:
             *                      byte rangeSize=parser.ReadByte();
             *
             *                      for(int c=0;c<=rangeSize;c++){
             *
             *                              // Fetch the base glyph:
             *                              Glyph glyph=font.GetGlyphDirect(baseCharcode);
             *
             *                              if(glyph!=null){
             *
             *                                      // Combine baseCharcode with varSelector next to form the variation (of "glyph").
             *
             *                                      // Get the full charcode (this is incorrect!):
             *                                      // int charcode=char.ConvertToUtf32((char)baseCharcode,(char)varSelector);
             *
             *                                      // Add:
             *                                      //glyph.AddCharcode(charcode);
             *
             *                              }
             *
             *                              // Move baseCharcode along:
             *                              baseCharcode++;
             *
             *                      }
             *
             *              }
             *
             *              // Restore parser:
             *              parser.Position=position;
             *
             *      }
             *
             *      // Got a ref to a non-default style table?
             *      if(nonDefaultUVSOffset!=0){
             *
             *              // Yep! The UVS is simply a list of "base" characters, each with ranges of available charcodes.
             *              // [BaseCharCode][The extended part. Each of these comes from the range.]
             *              // This time though, the glyph to use is directly specified
             *              // (that's what gives it the "non-default" property).
             *
             *              // Seek to the table:
             *              parser.Position=start+nonDefaultUVSOffset;
             *
             *              // Read the number of mappings:
             *              int numMappings=(int)parser.ReadUInt32();
             *
             *              // For each one..
             *              for(int m=0;m<numMappings;m++){
             *
             *                      // Read the base charcode:
             *                      int baseCharcode=(int)parser.ReadUInt24();
             *
             *                      // Read glyph ID:
             *                      int glyphID=(int)parser.ReadUInt16();
             *
             *                      // Get the glyph:
             *                      Glyph glyph=glyphs[glyphID];
             *
             *                      if(glyph!=null){
             *
             *                              // Combine baseCharcode with varSelector next to form the variation (of "glyph").
             *
             *                              // Get the full charcode (this is incorrect!):
             *                              // int charcode=char.ConvertToUtf32((char)baseCharcode,(char)varSelector);
             *
             *                              // Add:
             *                              //glyph.AddCharcode(charcode);
             *
             *                      }
             *
             *              }
             *
             *              // Restore parser:
             *              parser.Position=position;
             *
             *      }
             *
             * }
             *
             * break;
             *
             */

            default:
                Fonts.OnLogMessage("InfiniText does not currently support part of this font. If you need it, please contact us with this: Format: " + format);
                break;
            }

            return(characterCount);
        }
Exemple #2
0
        public static bool Load(FontParser parser, int start, FontFace font, Glyph[] glyphs)
        {
            // Seek there:
            parser.Position = start;

            // Read the version (and check if it's zero):
            if (parser.ReadUInt16() != 0)
            {
                return(false);
            }

            // Strangely the cmap table can have lots of tables inside it. For now we're looking for the common type 3 table.

            // Number of tables:
            int tableCount = parser.ReadUInt16();

            // Total characters in font:
            int characterCount = 0;

            int offset = -1;
            int favour = 0;

            for (int i = 0; i < tableCount; i += 1)
            {
                // Grab the platform ID:
                int platformId = parser.ReadUInt16();

                // And the encoding ID:
                int encodingId = parser.ReadUInt16();

                if (platformId == 3 || platformId == 0)
                {
                    if (encodingId == 10)
                    {
                        // Top favourite - most broad Unicode encoding.

                        // Read offset:
                        offset = (int)parser.ReadUInt32();

                        break;
                    }
                    else if (encodingId == 1 || encodingId == 0)
                    {
                        // Read offset:
                        offset = (int)parser.ReadUInt32();

                        // Mid-range favourite:
                        favour = 1;

                        continue;
                    }
                    else if (favour == 0)
                    {
                        // Anything else we'll give a try:

                        // Read offset (but don't break):
                        offset = (int)parser.ReadUInt32();

                        continue;
                    }
                }

                // Skip offset:
                parser.Position += 4;
            }

            if (offset == -1)
            {
                // We don't support this font :(
                return(false);
            }

            // Seek to the cmap now:
            parser.Position = start + offset;

            // Check it's format 4:
            int format = parser.ReadUInt16();

            if (format > 6)
            {
                // We now have e.g. 12.0 - another short here:
                parser.Position += 2;

                // Size/ structure are both 4 byte ints now:
                parser.Position += 8;
            }
            else
            {
                // Size of the sub-table (map length, u16):
                parser.Position += 2;

                // Structure of the sub-table (map language, u16):
                parser.Position += 2;
            }

            switch (format)
            {
            case 0:

                // Byte encoding table:

                for (int i = 0; i < 256; i++)
                {
                    int rByte = parser.ReadByte();

                    Glyph glyph = glyphs[rByte];

                    if (glyph != null)
                    {
                        characterCount++;

                        glyph.AddCharcode(i);
                    }
                }

                break;

            case 2:

                // The offset to the headers:
                int subOffset = parser.Position + (256 * 2);

                // For each high byte:
                for (int i = 0; i < 256; i++)
                {
                    // Read the index to the header and zero out the bottom 3 bits:
                    int headerPosition = subOffset + (parser.ReadUInt16() & (~7));

                    // Read the header:
                    int   firstCode  = parser.ReadUInt16(ref headerPosition);
                    int   entryCount = parser.ReadUInt16(ref headerPosition);
                    short idDelta    = parser.ReadInt16(ref headerPosition);

                    // Grab the current position:
                    int pos = headerPosition;

                    // Read the idRangeOffset - the last part of the header:
                    pos += parser.ReadUInt16(ref headerPosition);

                    int maxCode = firstCode + entryCount;

                    // Get the high byte value:
                    int highByte = (i << 8);

                    // For each low byte:
                    for (int j = firstCode; j < maxCode; j++)
                    {
                        // Get the full charcode (which might not actually exist yet):
                        int charCode = highByte + j;

                        // Read the base of the glyphIndex:
                        int p = parser.ReadUInt16(ref pos);

                        if (p == 0)
                        {
                            continue;
                        }

                        p = (p + idDelta) & 0xFFFF;

                        if (p == 0)
                        {
                            continue;
                        }

                        Glyph glyph = glyphs[p];

                        if (glyph != null)
                        {
                            characterCount++;

                            glyph.AddCharcode(charCode);
                        }
                    }
                }

                break;

            case 4:

                // Segment count. It's doubled.
                int segCount = (parser.ReadUInt16() >> 1);

                // Search range, entry selector and range shift (don't need any):
                parser.Position += 6;

                int baseIndex = parser.Position;

                int endCountIndex = baseIndex;

                baseIndex += 2;

                int startCountIndex    = baseIndex + segCount * 2;
                int idDeltaIndex       = baseIndex + segCount * 4;
                int idRangeOffsetIndex = baseIndex + segCount * 6;

                for (int i = 0; i < segCount - 1; i++)
                {
                    int endCount      = parser.ReadUInt16(ref endCountIndex);
                    int startCount    = parser.ReadUInt16(ref startCountIndex);
                    int idDelta       = parser.ReadInt16(ref idDeltaIndex);
                    int idRangeOffset = parser.ReadUInt16(ref idRangeOffsetIndex);

                    for (int c = startCount; c <= endCount; c++)
                    {
                        int glyphIndex;

                        if (idRangeOffset != 0)
                        {
                            // The idRangeOffset is relative to the current position in the idRangeOffset array.
                            // Take the current offset in the idRangeOffset array.
                            int glyphIndexOffset = (idRangeOffsetIndex - 2);

                            // Add the value of the idRangeOffset, which will move us into the glyphIndex array.
                            glyphIndexOffset += idRangeOffset;

                            // Then add the character index of the current segment, multiplied by 2 for USHORTs.
                            glyphIndexOffset += (c - startCount) * 2;

                            glyphIndex = parser.ReadUInt16(ref glyphIndexOffset);

                            if (glyphIndex != 0)
                            {
                                glyphIndex = (glyphIndex + idDelta) & 0xFFFF;
                            }
                        }
                        else
                        {
                            glyphIndex = (c + idDelta) & 0xFFFF;
                        }

                        // Add a charcode to the glyph now:
                        Glyph glyph = glyphs[glyphIndex];

                        if (glyph != null)
                        {
                            characterCount++;

                            glyph.AddCharcode(c);
                        }
                    }
                }

                break;

            case 6:

                int firstCCode  = parser.ReadUInt16();
                int entryCCount = parser.ReadUInt16();

                for (int i = 0; i < entryCCount; i++)
                {
                    Glyph glyphC = glyphs[parser.ReadUInt16()];

                    if (glyphC != null)
                    {
                        characterCount++;

                        glyphC.AddCharcode(firstCCode + i);
                    }
                }

                break;

            case 12:

                int groups = (int)parser.ReadUInt32();

                for (int i = 0; i < groups; i++)
                {
                    int startCode  = (int)parser.ReadUInt32();
                    int endCode    = (int)parser.ReadUInt32();
                    int startGlyph = (int)parser.ReadUInt32();

                    int count = (endCode - startCode);

                    for (int j = 0; j <= count; j++)
                    {
                        int glyphIndex = (startGlyph + j);

                        Glyph glyph = glyphs[glyphIndex];

                        if (glyph != null)
                        {
                            characterCount++;

                            glyph.AddCharcode(startCode + j);
                        }
                    }
                }

                break;

            default:
                Fonts.OnLogMessage("InfiniText does not currently support this font. If you need it, please contact us with this: Format: " + format);
                break;
            }

            font.CharacterCount = characterCount;

            return(true);
        }