private static TopDict[] LoadTopDicts(FontSource p, uint offset, ByteSegment[] cffIndex, ByteSegment[] strings)
{
var arr = new TopDict[cffIndex.Length];
for (var i = 0; i < cffIndex.Length; i++)
{
var bsi = cffIndex[i];
var topDict = CffDictParser.LoadTopDict(p.Bytes, bsi.Offset, bsi.Count, strings);
var privateSize = topDict.Private[0];
var privateOffset = topDict.Private[1];
if (privateSize != 0 && privateOffset != 0)
{
var privateDict =
CffDictParser.LoadPrivateDict(p.Bytes, privateOffset + offset, privateSize);
topDict.DefaultWidthX = privateDict.DefaultWidthX;
topDict.NormalWidthX = privateDict.NormalWidthX;
if (privateDict.Subrs != 0)
{
var subrOffset = privateOffset + privateDict.Subrs;
p.Offset = subrOffset + offset;
var subrIndex = LoadIndexData(p);
topDict.Subrs = subrIndex;
topDict.SubrsBias = GetSubrBias(topDict.Subrs.Length);
}
topDict.PrivateDict = privateDict;
}
arr[i] = topDict;
}
return(arr);
}
private CompactFontFormatTable(FontSource source, FontModel font)
{
var tableOffset = source.Offset;
// Header
// Skip h_major, h_minor, h_hdrSize, h_offSize
source.Offset += 4;
// Ignore Name Index
LoadIndexData(source);
// Top Dict Index
var topDictIndex = LoadIndexData(source);
// String Index
var stringIndex = LoadIndexData(source);
var globalSubrIndex = LoadIndexData(source);
if (globalSubrIndex != null)
{
font.GSubrs = globalSubrIndex;
font.GSubrsBias = GetSubrBias(font.GSubrs.Length);
}
var topDictArray = LoadTopDicts(source, tableOffset, topDictIndex, stringIndex);
if (topDictArray.Length != 1)
{
throw new FontException($"Too Many TopDict: {topDictArray.Length}");
}
font.TopDict = topDictArray[0];
if (font.TopDict.PrivateDict != null)
{
font.DefaultWidthX = font.TopDict.PrivateDict.DefaultWidthX;
font.NormalWidthX = font.TopDict.PrivateDict.NormalWidthX;
}
font.IsCidFont = font.TopDict.ROS.Item1 != null && font.TopDict.ROS.Item2 != null;
if (font.IsCidFont)
{
if (!font.TopDict.FDArrayIndex.HasValue || font.TopDict.FDArrayIndex.Value == 0)
{
throw new FontException("FDArray is missing.");
}
if (!font.TopDict.FDSelectIndex.HasValue || font.TopDict.FDSelectIndex.Value == 0)
{
throw new FontException("FDSelect is missing");
}
var fdArrayOffset = tableOffset + font.TopDict.FDArrayIndex.Value;
var fdSelectOffset = tableOffset + font.TopDict.FDSelectIndex.Value;
source.Offset = fdArrayOffset;
var fdArrayIndex = LoadIndexData(source);
font.TopDict.FDArray =
LoadTopDicts(source, tableOffset, fdArrayIndex, stringIndex);
font.TopDict.FDSelect =
LoadFdSelect(source, fdSelectOffset, font.GlyphCount, (uint)font.TopDict.FDArray.Length);
}
var privateDictOffset = tableOffset + font.TopDict.Private[1];
var privateDict = CffDictParser.LoadPrivateDict(source.Bytes, privateDictOffset, font.TopDict.Private[0]);
font.DefaultWidthX = privateDict.DefaultWidthX;
font.NormalWidthX = privateDict.NormalWidthX;
if (privateDict.Subrs != 0)
{
var subrOffset = privateDictOffset + privateDict.Subrs;
source.Offset = subrOffset;
var subrIndex = LoadIndexData(source);
font.Subrs = subrIndex;
font.SubrsBias = GetSubrBias(font.Subrs.Length);
}
else
{
font.Subrs = new ByteSegment[0];
font.SubrsBias = 0;
}
source.Offset = tableOffset + font.TopDict.CharStrings;
_charStringIndex = LoadIndexData(source);
}