public static LigatureCaretList Load(BigEndianBinaryReader reader, long offset)
{
// Ligature Caret list
// Type | Name | Description
// ----------|--------------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | coverageOffset | Offset to Coverage table - from beginning of LigCaretList table.
// ----------|--------------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | ligGlyphCount | Number of ligature glyphs.
// ----------|--------------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | ligGlyphOffsets[ligGlyphCount] | Array of offsets to LigGlyph tables, from beginning of LigCaretList table —in Coverage Index order.
// ----------|--------------------------------|--------------------------------------------------------------------------------------------------------
reader.Seek(offset, SeekOrigin.Begin);
ushort coverageOffset = reader.ReadUInt16();
ushort ligGlyphCount = reader.ReadUInt16();
using Buffer <ushort> ligGlyphOffsetsBuffer = new(ligGlyphCount);
Span <ushort> ligGlyphOffsets = ligGlyphOffsetsBuffer.GetSpan();
reader.ReadUInt16Array(ligGlyphOffsets);
var ligatureCaretList = new LigatureCaretList()
{
CoverageTable = CoverageTable.Load(reader, offset + coverageOffset)
};
ligatureCaretList.LigatureGlyphs = new LigatureGlyph[ligGlyphCount];
for (int i = 0; i < ligatureCaretList.LigatureGlyphs.Length; i++)
{
ligatureCaretList.LigatureGlyphs[i] = LigatureGlyph.Load(reader, ligGlyphOffsets[i]);
}
return(ligatureCaretList);
}
public static GlyphDefinitionTable Load(BigEndianBinaryReader reader)
{
// Header version 1.0
// Type | Name | Description
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | majorVersion | Major version of the GDEF table, = 1
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | minorVersion | Minor version of the GDEF table, = 0
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | glyphClassDefOffset | Offset to class definition table for glyph type, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | attachListOffset | Offset to attachment point list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | ligCaretListOffset | Offset to ligature caret list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | markAttachClassDefOffset | Offset to class definition table for mark attachment type, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Header version 1.2
// Type | Name | Description
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | majorVersion | Major version of the GDEF table, = 1
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | minorVersion | Minor version of the GDEF table, = 0
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | glyphClassDefOffset | Offset to class definition table for glyph type, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | attachListOffset | Offset to attachment point list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | ligCaretListOffset | Offset to ligature caret list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | markAttachClassDefOffset | Offset to class definition table for mark attachment type, from beginning of GDEF header (may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | markGlyphSetsDefOffset | Offset to the table of mark glyph set definitions, from beginning of GDEF header (may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Header version 1.3
// Type | Name | Description
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | majorVersion | Major version of the GDEF table, = 1
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// uint16 | minorVersion | Minor version of the GDEF table, = 0
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | glyphClassDefOffset | Offset to class definition table for glyph type, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | attachListOffset | Offset to attachment point list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | ligCaretListOffset | Offset to ligature caret list table, from beginning of GDEF header(may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | markAttachClassDefOffset | Offset to class definition table for mark attachment type, from beginning of GDEF header (may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset16 | markGlyphSetsDefOffset | Offset to the table of mark glyph set definitions, from beginning of GDEF header (may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
// Offset32 | itemVarStoreOffset | Offset to the Item Variation Store table, from beginning of GDEF header (may be NULL).
// ----------|--------------------------|--------------------------------------------------------------------------------------------------------
ushort majorVersion = reader.ReadUInt16();
ushort minorVersion = reader.ReadUInt16();
ushort glyphClassDefOffset = reader.ReadUInt16();
ushort attachListOffset = reader.ReadUInt16();
ushort ligatureCaretListOffset = reader.ReadUInt16();
ushort markAttachClassDefOffset = reader.ReadUInt16();
ushort markGlyphSetsDefOffset = 0;
uint itemVarStoreOffset = 0;
switch (minorVersion)
{
case 0:
break;
case 2:
markGlyphSetsDefOffset = reader.ReadUInt16();
break;
case 3:
markGlyphSetsDefOffset = reader.ReadUInt16();
itemVarStoreOffset = reader.ReadUInt32();
break;
default:
throw new InvalidFontFileException($"Invalid value for 'minor version' {minorVersion} of GDEF table. Should be '0', '2' or '3'.");
}
ClassDefinitionTable?classDefinitionTable = glyphClassDefOffset is 0 ? null : ClassDefinitionTable.Load(reader, glyphClassDefOffset);
AttachmentListTable? attachmentListTable = attachListOffset is 0 ? null : AttachmentListTable.Load(reader, attachListOffset);
LigatureCaretList? ligatureCaretList = ligatureCaretListOffset is 0 ? null : LigatureCaretList.Load(reader, ligatureCaretListOffset);
ClassDefinitionTable?markAttachmentClassDef = markAttachClassDefOffset is 0 ? null : ClassDefinitionTable.Load(reader, markAttachClassDefOffset);
MarkGlyphSetsTable? markGlyphSetsTable = markGlyphSetsDefOffset is 0 ? null : MarkGlyphSetsTable.Load(reader, markGlyphSetsDefOffset);
var glyphDefinitionTable = new GlyphDefinitionTable()
{
GlyphClassDefinition = classDefinitionTable,
AttachmentListTable = attachmentListTable,
LigatureCaretList = ligatureCaretList,
MarkAttachmentClassDef = markAttachmentClassDef,
MarkGlyphSetsTable = markGlyphSetsTable
};
// TODO: read itemVarStore.
return(glyphDefinitionTable);
}
