/// <summary> Creates a new math variants table by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. </param>
public VariantsTable(BinaryReader reader)
{
Contract.Requires(reader != null);
long start = reader.BaseStream.Position;//the index in the reader of the start of this variants table
//gather all elements in this variants
MinConnectorOverlap = reader.ReadUInt16();
uint verticalGlyphCoverageOffset = reader.ReadUInt16EvenThoughSpecsSays32();
uint horizontalGlyphCoverageOffset = reader.ReadUInt16EvenThoughSpecsSays32();
//get the offsets where the glyph constructions are
var verticalGlyphOffsets = new uint[reader.ReadUInt16()];
var horizontalGlyphOffsets = new uint[reader.ReadUInt16()];
for (int i = 0; i < verticalGlyphOffsets.Length; i++)
{
verticalGlyphOffsets[i] = reader.ReadUInt16EvenThoughSpecsSays32();
}
for (int i = 0; i < horizontalGlyphOffsets.Length; i++)
{
horizontalGlyphOffsets[i] = reader.ReadUInt16EvenThoughSpecsSays32();
}
//read the glyph constructions
var verticalGlyphConstructions = new GlyphConstruction[verticalGlyphOffsets.Length];
var horizontalGlyphConstructions = new GlyphConstruction[horizontalGlyphOffsets.Length];
for (int i = 0; i < verticalGlyphOffsets.Length; i++)
{
reader.BaseStream.Position = start + verticalGlyphOffsets[i];
verticalGlyphConstructions[i] = new GlyphConstruction(reader);
}
for (int i = 0; i < horizontalGlyphOffsets.Length; i++)
{
reader.BaseStream.Position = start + horizontalGlyphOffsets[i];
horizontalGlyphConstructions[i] = new GlyphConstruction(reader);
}
//get coverages at their locations:
reader.BaseStream.Position = start + verticalGlyphCoverageOffset;
VerticalCoverage = reader.ReadCoverageTable();
reader.BaseStream.Position = start + horizontalGlyphCoverageOffset;
HorizontalCoverage = reader.ReadCoverageTable();
}
/// <summary> Creates a new header by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. The caller is responsible for disposal. </param>
public MathTable(BinaryReader reader)
{
Contract.Requires(reader != null);
Contract.Requires(reader.BaseStream.CanSeek);
long mathTableOffset = reader.BaseStream.Position;
MainVersion = reader.ReadUInt16(); //section 4.3 of the specs says 16.16 bits for anything of type 'Fixed' (i.e. main version dot subversion)
SubVersion = reader.ReadUInt16();
uint offsetToConstantsTable = reader.ReadUInt16EvenThoughSpecsSays32();
uint offsetToGlyphInfo = reader.ReadUInt16EvenThoughSpecsSays32();
uint offsetToVariants = reader.ReadUInt16EvenThoughSpecsSays32();
reader.BaseStream.Position = mathTableOffset + offsetToConstantsTable;
Constants = new ConstantsTable(reader);
reader.BaseStream.Position = mathTableOffset + offsetToGlyphInfo;
Glyphs = new GlyphInfo(reader);
reader.BaseStream.Position = mathTableOffset + offsetToVariants;
Variants = new VariantsTable(reader);
}
/// <summary> Creates a new kern info table by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. </param>
/// <param name="kernInfoTableStart"> The offsets to be read are relative to the start of the MathKernInfoTable, which is to be provided as argument here. </param>
public KernInfoRecord(BinaryReader reader, long kernInfoTableStart)
{
Contract.Requires(reader != null);
uint topRightKernOffset = reader.ReadUInt16EvenThoughSpecsSays32();
uint topLeftKernOffset = reader.ReadUInt16EvenThoughSpecsSays32();
uint bottomRightKernOffset = reader.ReadUInt16EvenThoughSpecsSays32();
uint bottomLeftKernOffset = reader.ReadUInt16EvenThoughSpecsSays32();
long end = reader.BaseStream.Position;
if (topRightKernOffset != 0)
{
reader.BaseStream.Position = kernInfoTableStart + topRightKernOffset;
TopRightKern = new Kern(reader);
}
if (topLeftKernOffset != 0)
{
reader.BaseStream.Position = kernInfoTableStart + topLeftKernOffset;
TopLeftKern = new Kern(reader);
}
if (bottomRightKernOffset != 0)
{
reader.BaseStream.Position = kernInfoTableStart + bottomRightKernOffset;
BottomRightKern = new Kern(reader);
}
if (bottomLeftKernOffset != 0)
{
reader.BaseStream.Position = kernInfoTableStart + bottomLeftKernOffset;
BottomLeftKern = new Kern(reader);
}
reader.BaseStream.Position = end;//restore position, such that the next KernInfo can be read. It would be neat to do this everywhere, regardless of whether it is necessary.
}
/// <summary> Creates a new italics correction info table by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. </param>
public ItalicsCorrectionInfoTable(BinaryReader reader)
{
Contract.Requires(reader != null);
long start = reader.BaseStream.Position;//the start of this correction info table
uint offsetToCoverageTable = reader.ReadUInt16EvenThoughSpecsSays32();
//read corrections
var corrections = new short[reader.ReadUInt16()];
for (int i = 0; i < corrections.Length; i++)
{
corrections[i] = reader.ReadValueRecord();
}
Corrections = new ReadOnlyCollection<short>(corrections);
//read coverage table
reader.BaseStream.Position = start + offsetToCoverageTable;
CoverageTable = reader.ReadCoverageTable();
}
/// <summary> Creates a new math glyph info by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. </param>
public KernInfoTable(BinaryReader reader)
{
Contract.Requires(reader != null);
long start = reader.BaseStream.Position;
uint coverageOffset = reader.ReadUInt16EvenThoughSpecsSays32();
int count = reader.ReadInt16();
var backingArray = new KernInfoRecord[count];
for (int i = 0; i < count; i++)
{
backingArray[i] = new KernInfoRecord(reader, start);
}
KernInfoRecords = new ReadOnlyCollection<KernInfoRecord>(backingArray);
if (coverageOffset != 0)
{
reader.BaseStream.Position = start + coverageOffset;
Coverage = reader.ReadCoverageTable();
}
}
/// <summary> Creates a new glyph construction table by reading it from the specified stream. </summary>
/// <param name="reader"> The correctly positioned stream to read from. </param>
public GlyphConstruction(BinaryReader reader)
{
Contract.Requires(reader != null);
Contract.Requires(reader.BaseStream.CanSeek);
long start = reader.BaseStream.Position; //the index in the reader of the start of this glyph construction table
uint assemblyOffset = reader.ReadUInt16EvenThoughSpecsSays32();
//get glyph variants:
var glyphVariants = new GlyphVariantRecord[reader.ReadUInt16()];
for (int i = 0; i < glyphVariants.Length; i++)
{
glyphVariants[i] = new GlyphVariantRecord(reader);
}
GlyphVariants = new ReadOnlyCollection<GlyphVariantRecord>(glyphVariants);
//get glyph assembly:
if (assemblyOffset != 0)
{
reader.BaseStream.Position = start + assemblyOffset;
GlyphAssembly = new GlyphAssemblyTable(reader);
}
}
