/// <summary>
/// Populate the <i>composites</i>IList containing all child glyphs
/// that this glyph uses.
/// </summary>
/// <remarks>
/// The <i>stream</i> parameter must be positioned 10 bytes from
/// the beginning of the glyph description, i.e. the flags field.
/// </remarks>
/// <param name="stream"></param>
private void ReadCompositeGlyph(FontFileStream stream, Glyph glyph) {
bool moreComposites = true;
while (moreComposites) {
short flags = stream.ReadShort();
long offset = stream.Position;
int subsetIndex = reader.IndexMappings.Map(stream.ReadShort());
glyph.AddChild(subsetIndex);
// While we're here, remap the child glyph index
stream.Position = stream.Position - PrimitiveSizes.Short;
stream.WriteShort(subsetIndex);
// The following code is based on the C pseudo code supplied
// in the glyf table specification.
int skipBytes = 0;
if ((flags & BitMasks.Arg1And2AreWords) > 0) {
skipBytes = PrimitiveSizes.Short*2;
}
else {
skipBytes = PrimitiveSizes.UShort;
}
if ((flags & BitMasks.WeHaveAScale) > 0) {
// Skip scale
skipBytes = PrimitiveSizes.F2DOT14;
}
else if ((flags & BitMasks.WeHaveAnXAndYScale) > 0) {
// Skip xscale and yscale
skipBytes = PrimitiveSizes.F2DOT14*2;
}
else if ((flags & BitMasks.WeHaveATwoByTwo) > 0) {
// Skip xscale, scale01, scale10 and yscale
skipBytes = PrimitiveSizes.F2DOT14*4;
}
// Glyph instructions
if ((flags & BitMasks.WeHaveInstructions) > 0) {
skipBytes = PrimitiveSizes.Byte*stream.ReadUShort();
}
if ((flags & BitMasks.MoreComponents) > 0) {
moreComposites = true;
}
else {
moreComposites = false;
}
stream.Skip(skipBytes);
}
}
/// <summary>
/// Reads a glyph description from the specified offset.
/// </summary>
public Glyph ReadGlyph(int glyphIndex) {
FontFileStream stream = reader.Stream;
// Offset from beginning of font file
uint fileOffset = glyfEntry.Offset + loca[glyphIndex];
long length = GetGlyphLength(glyphIndex);
Glyph glyph = new Glyph(reader.IndexMappings.Map(glyphIndex));
if (length != 0) {
byte[] glyphData = new byte[length];
// Read glyph description into byte array
stream.Position = fileOffset;
stream.Read(glyphData, 0, glyphData.Length);
glyph.SetGlyphData(glyphData);
FontFileStream glyphStream = new FontFileStream(glyphData);
// This fields dictates whether the glyph is a simple or composite glyph
bool compositeGlyph = (glyphStream.ReadShort() < 0);
// Skip font bounding box
glyphStream.Skip(PrimitiveSizes.Short*4);
if (compositeGlyph) {
ReadCompositeGlyph(glyphStream, glyph);
}
}
return glyph;
}
/// <summary>
/// Reads a glyph description from the specified offset.
/// </summary>
public Glyph ReadGlyph(int glyphIndex)
{
FontFileStream stream = reader.Stream;
// Offset from beginning of font file
uint fileOffset = glyfEntry.Offset + loca[glyphIndex];
long length = GetGlyphLength(glyphIndex);
Glyph glyph = new Glyph(reader.IndexMappings.Map(glyphIndex));
if (length != 0)
{
byte[] glyphData = new byte[length];
// Read glyph description into byte array
stream.Position = fileOffset;
stream.Read(glyphData, 0, glyphData.Length);
glyph.SetGlyphData(glyphData);
FontFileStream glyphStream = new FontFileStream(glyphData);
// This fields dictates whether the glyph is a simple or composite glyph
bool compositeGlyph = (glyphStream.ReadShort() < 0);
// Skip font bounding box
glyphStream.Skip(PrimitiveSizes.Short * 4);
if (compositeGlyph)
{
ReadCompositeGlyph(glyphStream, glyph);
}
}
return(glyph);
}
/// <summary>
/// Populate the <i>composites</i>IList containing all child glyphs
/// that this glyph uses.
/// </summary>
/// <remarks>
/// The <i>stream</i> parameter must be positioned 10 bytes from
/// the beginning of the glyph description, i.e. the flags field.
/// </remarks>
/// <param name="stream"></param>
private void ReadCompositeGlyph(FontFileStream stream, Glyph glyph)
{
bool moreComposites = true;
while (moreComposites)
{
short flags = stream.ReadShort();
long offset = stream.Position;
int subsetIndex = reader.IndexMappings.Map(stream.ReadShort());
glyph.AddChild(subsetIndex);
// While we're here, remap the child glyph index
stream.Position = stream.Position - PrimitiveSizes.Short;
stream.WriteShort(subsetIndex);
// The following code is based on the C pseudo code supplied
// in the glyf table specification.
int skipBytes = 0;
if ((flags & BitMasks.Arg1And2AreWords) > 0)
{
skipBytes = PrimitiveSizes.Short * 2;
}
else
{
skipBytes = PrimitiveSizes.UShort;
}
if ((flags & BitMasks.WeHaveAScale) > 0)
{
// Skip scale
skipBytes = PrimitiveSizes.F2DOT14;
}
else if ((flags & BitMasks.WeHaveAnXAndYScale) > 0)
{
// Skip xscale and yscale
skipBytes = PrimitiveSizes.F2DOT14 * 2;
}
else if ((flags & BitMasks.WeHaveATwoByTwo) > 0)
{
// Skip xscale, scale01, scale10 and yscale
skipBytes = PrimitiveSizes.F2DOT14 * 4;
}
// Glyph instructions
if ((flags & BitMasks.WeHaveInstructions) > 0)
{
skipBytes = PrimitiveSizes.Byte * stream.ReadUShort();
}
if ((flags & BitMasks.MoreComponents) > 0)
{
moreComposites = true;
}
else
{
moreComposites = false;
}
stream.Skip(skipBytes);
}
}