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;
}
}
}
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);
}
}
}