/// <summary>
/// Creates a new font image that is a subset of this font image containing only the specified glyphs.
/// </summary>
public FontData CreateFontSubSet(Dictionary <int, object> glyphs, bool cidFont)
{
// Create new font image
FontData fontData = new FontData(this);
// Create new loca and glyf table
IndexToLocationTable loca = new IndexToLocationTable();
loca.ShortIndex = this.loca.ShortIndex;
GlyphDataTable glyf = new GlyphDataTable();
// Add all required tables
//fontData.AddTable(this.os2);
if (!cidFont)
{
fontData.AddTable(this.cmap);
}
if (this.cvt != null)
{
fontData.AddTable(this.cvt);
}
if (this.fpgm != null)
{
fontData.AddTable(this.fpgm);
}
fontData.AddTable(glyf);
fontData.AddTable(this.head);
fontData.AddTable(this.hhea);
fontData.AddTable(this.hmtx);
fontData.AddTable(loca);
if (this.maxp != null)
{
fontData.AddTable(this.maxp);
}
//fontData.AddTable(this.name);
if (this.prep != null)
{
fontData.AddTable(this.prep);
}
// Get closure of used glyphs
this.glyf.CompleteGlyphClosure(glyphs);
// Create a sorted array of all used glyphs
int glyphCount = glyphs.Count;
int[] glyphArray = new int[glyphCount];
glyphs.Keys.CopyTo(glyphArray, 0);
Array.Sort <int>(glyphArray);
// Calculate new size of glyph table.
int size = 0;
for (int idx = 0; idx < glyphCount; idx++)
{
size += this.glyf.GetGlyphSize(glyphArray[idx]);
}
glyf.DirectoryEntry.Length = size;
// Create new loca table
int numGlyphs = this.maxp.numGlyphs;
loca.locaTable = new int[numGlyphs + 1];
// Create new glyf table
glyf.glyphTable = new byte[glyf.DirectoryEntry.PaddedLength];
// Fill new glyf and loca table
int glyphOffset = 0;
int glyphIndex = 0;
for (int idx = 0; idx < numGlyphs; idx++)
{
loca.locaTable[idx] = glyphOffset;
if (glyphIndex < glyphCount && glyphArray[glyphIndex] == idx)
{
glyphIndex++;
byte[] bytes = this.glyf.GetGlyphData(idx);
int length = bytes.Length;
if (length > 0)
{
Buffer.BlockCopy(bytes, 0, glyf.glyphTable, glyphOffset, length);
glyphOffset += length;
}
}
}
loca.locaTable[numGlyphs] = glyphOffset;
// Compile font tables into byte array
fontData.Compile();
return(fontData);
}
/// <summary>
/// Creates a new font image that is a subset of this font image containing only the specified glyphs.
/// </summary>
public FontData CreateFontSubSet(Dictionary<int, object> glyphs, bool cidFont)
{
// Create new font image
FontData fontData = new FontData(this);
// Create new loca and glyf table
IndexToLocationTable loca = new IndexToLocationTable();
loca.ShortIndex = this.loca.ShortIndex;
GlyphDataTable glyf = new GlyphDataTable();
// Add all required tables
//fontData.AddTable(this.os2);
if (!cidFont)
fontData.AddTable(this.cmap);
if (this.cvt != null)
fontData.AddTable(this.cvt);
if (this.fpgm != null)
fontData.AddTable(this.fpgm);
fontData.AddTable(glyf);
fontData.AddTable(this.head);
fontData.AddTable(this.hhea);
fontData.AddTable(this.hmtx);
fontData.AddTable(loca);
if (this.maxp != null)
fontData.AddTable(this.maxp);
//fontData.AddTable(this.name);
if (this.prep != null)
fontData.AddTable(this.prep);
// Get closure of used glyphs
this.glyf.CompleteGlyphClosure(glyphs);
// Create a sorted array of all used glyphs
int glyphCount = glyphs.Count;
int[] glyphArray = new int[glyphCount];
glyphs.Keys.CopyTo(glyphArray, 0);
Array.Sort<int>(glyphArray);
// Calculate new size of glyph table.
int size = 0;
for (int idx = 0; idx < glyphCount; idx++)
size += this.glyf.GetGlyphSize(glyphArray[idx]);
glyf.DirectoryEntry.Length = size;
// Create new loca table
int numGlyphs = this.maxp.numGlyphs;
loca.locaTable = new int[numGlyphs + 1];
// Create new glyf table
glyf.glyphTable = new byte[glyf.DirectoryEntry.PaddedLength];
// Fill new glyf and loca table
int glyphOffset = 0;
int glyphIndex = 0;
for (int idx = 0; idx < numGlyphs; idx++)
{
loca.locaTable[idx] = glyphOffset;
if (glyphIndex < glyphCount && glyphArray[glyphIndex] == idx)
{
glyphIndex++;
byte[] bytes = this.glyf.GetGlyphData(idx);
int length = bytes.Length;
if (length > 0)
{
Buffer.BlockCopy(bytes, 0, glyf.glyphTable, glyphOffset, length);
glyphOffset += length;
}
}
}
loca.locaTable[numGlyphs] = glyphOffset;
// Compile font tables into byte array
fontData.Compile();
return fontData;
}