public static FeatureList CreateFrom(BinaryReader reader, long beginAt)
{
//https://www.microsoft.com/typography/otspec/chapter2.htm
//FeatureList table
//Type Name Description
//USHORT FeatureCount Number of FeatureRecords in this table
//struct FeatureRecord[FeatureCount] Array of FeatureRecords-zero-based (first feature has FeatureIndex = 0)-listed alphabetically by FeatureTag
//FeatureRecord
//Type Name Description
//Tag FeatureTag 4-byte feature identification tag
//Offset Feature Offset to Feature table-from beginning of FeatureList
reader.BaseStream.Seek(beginAt, SeekOrigin.Begin);
//
FeatureList featureList = new FeatureList();
ushort featureCount = reader.ReadUInt16();
FeatureRecord[] featureRecords = new FeatureRecord[featureCount];
for (int i = 0; i < featureCount; ++i)
{
//read script record
featureRecords[i] = new FeatureRecord(
reader.ReadUInt32(), //feature tag
reader.ReadInt16()); //offset
}
//read each feature table
FeatureTable[] featureTables = featureList.featureTables = new FeatureTable[featureCount];
for (int i = 0; i < featureCount; ++i)
{
FeatureRecord frecord = featureRecords[i];
(featureTables[i] = FeatureTable.CreateFrom(reader, beginAt + frecord.offset)).FeatureTag = frecord.featureTag;
}
return(featureList);
}
