private void PopulateGsubData(Dictionary <string, Dictionary <List <int>, int> > gsubData,
LangSysTable langSysTable, FeatureListTable featureListTable,
LookupListTable lookupListTable)
{
FeatureRecord[] featureRecords = featureListTable.FeatureRecords;
foreach (int featureIndex in langSysTable.FeatureIndices)
{
if (featureIndex < featureRecords.Length)
{
PopulateGsubData(gsubData, featureRecords[featureIndex], lookupListTable);
}
}
}
internal static GPosTable Load(BigEndianBinaryReader reader)
{
// GPOS Header, Version 1.0
// +----------+-------------------+-----------------------------------------------------------+
// | Type | Name | Description |
// +==========+===================+===========================================================+
// | uint16 | majorVersion | Major version of the GPOS table, = 1 |
// +----------+-------------------+-----------------------------------------------------------+
// | uint16 | minorVersion | Minor version of the GPOS table, = 0 |
// +----------+-------------------+-----------------------------------------------------------+
// | Offset16 | scriptListOffset | Offset to ScriptList table, from beginning of GPOS table |
// +----------+-------------------+-----------------------------------------------------------+
// | Offset16 | featureListOffset | Offset to FeatureList table, from beginning of GPOS table |
// +----------+-------------------+-----------------------------------------------------------+
// | Offset16 | lookupListOffset | Offset to LookupList table, from beginning of GPOS table |
// +----------+-------------------+-----------------------------------------------------------+
// GPOS Header, Version 1.1
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | Type | Name | Description |
// +==========+=========================+===============================================================================+
// | uint16 | majorVersion | Major version of the GPOS table, = 1 |
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | uint16 | minorVersion | Minor version of the GPOS table, = 1 |
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | Offset16 | scriptListOffset | Offset to ScriptList table, from beginning of GPOS table |
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | Offset16 | featureListOffset | Offset to FeatureList table, from beginning of GPOS table |
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | Offset16 | lookupListOffset | Offset to LookupList table, from beginning of GPOS table |
// +----------+-------------------------+-------------------------------------------------------------------------------+
// | Offset32 | featureVariationsOffset | Offset to FeatureVariations table, from beginning of GPOS table (may be NULL) |
// +----------+-------------------------+-------------------------------------------------------------------------------+
ushort majorVersion = reader.ReadUInt16();
ushort minorVersion = reader.ReadUInt16();
ushort scriptListOffset = reader.ReadOffset16();
ushort featureListOffset = reader.ReadOffset16();
ushort lookupListOffset = reader.ReadOffset16();
uint featureVariationsOffset = (minorVersion == 1) ? reader.ReadOffset32() : 0;
// TODO: Optimization. Allow only reading the scriptList.
var scriptList = ScriptList.Load(reader, scriptListOffset);
var featureList = FeatureListTable.Load(reader, featureListOffset);
var lookupList = LookupListTable.Load(reader, lookupListOffset);
// TODO: Feature Variations.
return(new GPosTable(scriptList, featureList, lookupList));
}
private void PopulateGsubData(Dictionary <string, Dictionary <List <int>, int> > gsubData,
FeatureRecord featureRecord, LookupListTable lookupListTable)
{
LookupTable[] lookups = lookupListTable.Lookups;
Dictionary <List <int>, int> glyphSubstitutionMap = new Dictionary <List <int>, int>();
foreach (int lookupIndex in featureRecord.FeatureTable.LookupListIndices)
{
if (lookupIndex < lookups.Length)
{
ExtractData(glyphSubstitutionMap, lookups[lookupIndex]);
}
}
Debug.WriteLine("debug: *********** extracting GSUB data for the feature: "
+ featureRecord.FeatureTag + ", glyphSubstitutionMap: "
+ glyphSubstitutionMap);
gsubData[featureRecord.FeatureTag] = glyphSubstitutionMap;
}
public GPosTable(ScriptList scriptList, FeatureListTable featureList, LookupListTable lookupList)
{
this.ScriptList = scriptList;
this.FeatureList = featureList;
this.LookupList = lookupList;
}
//private static readonly Log LOG = LogFactory.getLog(GlyphSubstitutionDataExtractor.class);
public GsubData GetGsubData(Dictionary <string, ScriptTable> scriptList, FeatureListTable featureListTable, LookupListTable lookupListTable)
{
ScriptTableDetails scriptTableDetails = GetSupportedLanguage(scriptList);
if (scriptTableDetails == null)
{
return(DefaultGsubData.NO_DATA_FOUND);
}
ScriptTable scriptTable = scriptTableDetails.ScriptTable;
Dictionary <string, Dictionary <List <int>, int> > gsubData = new Dictionary <string, Dictionary <List <int>, int> >(StringComparer.Ordinal);
// the starting point is really the scriptTags
if (scriptTable.DefaultLangSysTable != null)
{
PopulateGsubData(gsubData, scriptTable.DefaultLangSysTable, featureListTable,
lookupListTable);
}
foreach (LangSysTable langSysTable in scriptTable.LangSysTables.Values)
{
PopulateGsubData(gsubData, langSysTable, featureListTable, lookupListTable);
}
return(new MapBackedGsubData(scriptTableDetails.Language, scriptTableDetails.FeatureName, gsubData));
}
