// Parses the format 12 cmap table
// Refer to https://www.microsoft.com/typography/otspec/cmap.htm to learn about how this format is organized
private void ParseFormat12(byte[] source, ref uint offset, List <GlyphModel> allChars)
{
CmapFormat12Header header = ParseCmapFormat12Header(source, ref offset);
for (int i = 0; i < header.nGroups; i++)
{
uint startCharCode = ReadDataAndIncreaseIndex <uint>(source, ref offset, sizeof(uint));
uint endCharCode = ReadDataAndIncreaseIndex <uint>(source, ref offset, sizeof(uint));
uint startGlyphID = ReadDataAndIncreaseIndex <uint>(source, ref offset, sizeof(uint));
for (uint j = startCharCode; j <= endCharCode; j++)
{
GlyphModel newChar = new GlyphModel();
newChar.CodePoint = j;
newChar.GlyphID = (ushort)startGlyphID;
startGlyphID++;
byte[] byteJ = BitConverter.GetBytes(j);
newChar.Definition = Encoding.UTF32.GetString(byteJ);
if (!allChars.Contains(newChar))
{
allChars.Add(newChar);
}
}
}
}
// Parses the format 0 cmap table
// Refer to https://www.microsoft.com/typography/otspec/cmap.htm to learn about how this format is organized
private void ParseFormat0(byte[] source, ref uint offset, List <GlyphModel> allChars)
{
ushort formatID = ReadDataAndIncreaseIndex <ushort>(source, ref offset, sizeof(ushort));
Debug.Assert(formatID == 0);
ushort length = ReadDataAndIncreaseIndex <ushort>(source, ref offset, sizeof(ushort));
ushort language = ReadDataAndIncreaseIndex <ushort>(source, ref offset, sizeof(ushort));
byte[] idArray = ReadByteArrayAndIncreaseIndex(256, source, ref offset, sizeof(byte) * 256);
for (uint i = 0; i < idArray.Length; i++)
{
if (idArray[i] != 0)
{
GlyphModel newChar = new GlyphModel();
newChar.CodePoint = i;
newChar.GlyphID = idArray[i];
byte[] byteI = BitConverter.GetBytes(i);
newChar.Definition = Encoding.UTF32.GetString(byteI);
if (!allChars.Contains(newChar))
{
allChars.Add(newChar);
}
}
}
}
// Parses the format 4 cmap table
// Refer to https://www.microsoft.com/typography/otspec/cmap.htm to learn about how this format is organized
private void ParseFormat4(byte[] source, ref uint offset, List <GlyphModel> allChars)
{
CmapFormat4Header header = ParseCmapFormat4Header(source, ref offset);
int segCount = (int)header.segCountX2 / 2;
ushort[] endCountArray = ReadUshortArrayAndIncreaseIndex(segCount, source, ref offset, sizeof(ushort));
ushort reservedPad = ReadDataAndIncreaseIndex <ushort>(source, ref offset, sizeof(ushort));
ushort[] startCountArray = ReadUshortArrayAndIncreaseIndex(segCount, source, ref offset, sizeof(ushort));
short[] idDeltaArray = ReadShortArrayAndIncreaseIndex(segCount, source, ref offset, sizeof(short));
uint idRangeTableOffset = offset;
ushort[] idRangeTable = ReadUshortArrayAndIncreaseIndex(segCount, source, ref offset, sizeof(ushort));
for (byte i = 0; i < startCountArray.Length - 1; i++)
{
if (idRangeTable[i] == 0)
{
for (uint j = startCountArray[i]; j <= endCountArray[i]; j++)
{
GlyphModel newChar = new GlyphModel();
newChar.CodePoint = j;
newChar.GlyphID = (ushort)(j + idDeltaArray[i]);
byte[] byteJ = BitConverter.GetBytes(j);
newChar.Definition = Encoding.UTF32.GetString(byteJ);
if (!allChars.Contains(newChar))
{
allChars.Add(newChar);
}
}
}
else
{
uint glyphIdOffset = idRangeTableOffset + idRangeTable[i] + (uint)(i * 2);
for (uint j = startCountArray[i]; j <= endCountArray[i]; j++)
{
ushort gID = ReadDataAndIncreaseIndex <ushort>(source, ref glyphIdOffset, sizeof(ushort));
GlyphModel newChar = new GlyphModel();
newChar.CodePoint = j;
newChar.GlyphID = gID;
byte[] byteJ = BitConverter.GetBytes(j);
newChar.Definition = Encoding.UTF32.GetString(byteJ);
if (!allChars.Contains(newChar))
{
allChars.Add(newChar);
}
}
}
}
}
// Parses the format 6 cmap table
// Refer to https://www.microsoft.com/typography/otspec/cmap.htm to learn about how this format is organized
private void ParseFormat6(byte[] source, ref uint offset, List <GlyphModel> allChars)
{
CmapFormat6Header header = ParseCmapFormat6Header(source, ref offset);
for (uint i = 0; i < header.entryCount; i++)
{
ushort gID = ReadDataAndIncreaseIndex <ushort>(source, ref offset, sizeof(ushort));
if (gID != 0)
{
GlyphModel newChar = new GlyphModel();
newChar.CodePoint = i;
newChar.GlyphID = gID;
byte[] byteI = BitConverter.GetBytes(i);
newChar.Definition = Encoding.UTF32.GetString(byteI);
if (!allChars.Contains(newChar))
{
allChars.Add(newChar);
}
}
}
}
