Exemple #1
0
        protected override void ReadContentFrom(BinaryReader reader)
        {
            long   cblcBeginPos = reader.BaseStream.Position;
            ushort majorVersion = reader.ReadUInt16(); //3
            ushort minorVersion = reader.ReadUInt16(); //0
            uint   numSizes     = reader.ReadUInt32();

            //The CblcHeader is followed immediately by the BitmapSize table array(s).
            //The numSizes in the CblcHeader indicates the number of BitmapSize tables in the array.
            //Each strike is defined by one BitmapSize table.
            BitmapSizeTable[] bmpSizeTables = new BitmapSizeTable[numSizes];
            for (int i = 0; i < numSizes; ++i)
            {
                bmpSizeTables[i] = BitmapSizeTable.ReadBitmapSizeTable(reader);
            }
            _bmpSizeTables = bmpSizeTables;

            //
            //-------
            //IndexSubTableArray
            //Type      Name            Description
            //uint16    firstGlyphIndex First glyph ID of this range.
            //uint16    lastGlyphIndex  Last glyph ID of this range(inclusive).
            //Offset32  additionalOffsetToIndexSubtable     Add to indexSubTableArrayOffset to get offset from beginning of EBLC.

            //After determining the strike,
            //the rasterizer searches this array for the range containing the given glyph ID.
            //When the range is found, the additionalOffsetToIndexSubtable is added to the indexSubTableArrayOffset
            //to get the offset of the IndexSubTable in the EBLC.

            //The first indexSubTableArray is located after the last bitmapSizeSubTable entry.
            //Then the IndexSubTables for the strike follow.
            //Another IndexSubTableArray(if more than one strike) and
            //its IndexSubTableArray are next.

            //The EBLC continues with an array and IndexSubTables for each strike.
            //We now have the offset to the IndexSubTable.
            //All IndexSubTable formats begin with an IndexSubHeader which identifies the IndexSubTable format,
            //the format of the EBDT image data,
            //and the offset from the beginning of the EBDT table to the beginning of the image data for this range.

            for (int n = 0; n < numSizes; ++n)
            {
                BitmapSizeTable bmpSizeTable           = bmpSizeTables[n];
                uint            numberofIndexSubTables = bmpSizeTable.numberOfIndexSubTables;

                //
                IndexSubTableArray[] indexSubTableArrs = new IndexSubTableArray[numberofIndexSubTables];
                for (uint i = 0; i < numberofIndexSubTables; ++i)
                {
                    indexSubTableArrs[i] = new IndexSubTableArray(
                        reader.ReadUInt16(),      //First glyph ID of this range.
                        reader.ReadUInt16(),      //Last glyph ID of this range (inclusive).
                        reader.ReadUInt32());     //Add to indexSubTableArrayOffset to get offset from beginning of EBLC.
                }

                //---
                IndexSubTableBase[] subTables = new IndexSubTableBase[numberofIndexSubTables];
                bmpSizeTable.indexSubTables = subTables;
                for (uint i = 0; i < numberofIndexSubTables; ++i)
                {
                    IndexSubTableArray indexSubTableArr = indexSubTableArrs[i];
                    reader.BaseStream.Position = cblcBeginPos + bmpSizeTable.indexSubTableArrayOffset + indexSubTableArr.additionalOffsetToIndexSubtable;

                    IndexSubTableBase result = subTables[i] = IndexSubTableBase.CreateFrom(bmpSizeTable, reader);
                    result.firstGlyphIndex = indexSubTableArr.firstGlyphIndex;
                    result.lastGlyphIndex  = indexSubTableArr.lastGlyphIndex;
                }
            }
        }
Exemple #2
0
        protected override void ReadContentFrom(BinaryReader reader)
        {
            // load each strike table
            long eblcBeginPos = reader.BaseStream.Position;
            //
            ushort versionMajor = reader.ReadUInt16();
            ushort versionMinor = reader.ReadUInt16();
            uint   numSizes     = reader.ReadUInt32();

            if (numSizes > MAX_BITMAP_STRIKES)
            {
                throw new Exception("Too many bitmap strikes in font.");
            }

            //----------------
            var bmpSizeTables = new BitmapSizeTable[numSizes];

            for (int i = 0; i < numSizes; i++)
            {
                bmpSizeTables[i] = BitmapSizeTable.ReadBitmapSizeTable(reader);
            }
            _bmpSizeTables = bmpSizeTables;

            //
            //-------
            //IndexSubTableArray
            //Type      Name            Description
            //uint16    firstGlyphIndex First glyph ID of this range.
            //uint16    lastGlyphIndex  Last glyph ID of this range(inclusive).
            //Offset32  additionalOffsetToIndexSubtable     Add to indexSubTableArrayOffset to get offset from beginning of EBLC.

            //After determining the strike,
            //the rasterizer searches this array for the range containing the given glyph ID.
            //When the range is found, the additionalOffsetToIndexSubtable is added to the indexSubTableArrayOffset
            //to get the offset of the IndexSubTable in the EBLC.

            //The first indexSubTableArray is located after the last bitmapSizeSubTable entry.
            //Then the IndexSubTables for the strike follow.
            //Another IndexSubTableArray(if more than one strike) and
            //its IndexSubTableArray are next.

            //The EBLC continues with an array and IndexSubTables for each strike.
            //We now have the offset to the IndexSubTable.
            //All IndexSubTable formats begin with an IndexSubHeader which identifies the IndexSubTable format,
            //the format of the EBDT image data,
            //and the offset from the beginning of the EBDT table to the beginning of the image data for this range.

            for (int n = 0; n < numSizes; ++n)
            {
                BitmapSizeTable bmpSizeTable           = bmpSizeTables[n];
                uint            numberofIndexSubTables = bmpSizeTable.numberOfIndexSubTables;

                //
                IndexSubTableArray[] indexSubTableArrs = new IndexSubTableArray[numberofIndexSubTables];
                for (uint i = 0; i < numberofIndexSubTables; ++i)
                {
                    indexSubTableArrs[i] = new IndexSubTableArray(
                        reader.ReadUInt16(),      //First glyph ID of this range.
                        reader.ReadUInt16(),      //Last glyph ID of this range (inclusive).
                        reader.ReadUInt32());     //Add to indexSubTableArrayOffset to get offset from beginning of EBLC.
                }

                //---
                IndexSubTableBase[] subTables = new IndexSubTableBase[numberofIndexSubTables];
                bmpSizeTable.indexSubTables = subTables;
                for (uint i = 0; i < numberofIndexSubTables; ++i)
                {
                    IndexSubTableArray indexSubTableArr = indexSubTableArrs[i];
                    reader.BaseStream.Position = eblcBeginPos + bmpSizeTable.indexSubTableArrayOffset + indexSubTableArr.additionalOffsetToIndexSubtable;

                    subTables[i] = IndexSubTableBase.CreateFrom(bmpSizeTable, reader);
                }
            }
        }