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);
}
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;
}
public FeatureRecord GetFeatureRecord(uint i)
{
FeatureRecord fr = null;
if (i < FeatureCount)
{
uint offset = m_offsetFeatureListTable + (uint)FieldOffsets.FeatureRecordArray + i * 6;
if (offset + 6 <= m_bufTable.GetLength())
{
fr = new FeatureRecord();
fr.FeatureTag = m_bufTable.GetTag(offset);
fr.FeatureTableOffset = m_bufTable.GetUshort(offset + 4);
}
}
return(fr);
}
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 FeatureTable_val GetFeatureTable_val(FeatureRecord fr)
{
return new FeatureTable_val((ushort)(m_offsetFeatureListTable + fr.FeatureTableOffset), m_bufTable);
}
public FeatureTable_val GetFeatureTable_val(FeatureRecord fr)
{
return(new FeatureTable_val((ushort)(m_offsetFeatureListTable + fr.FeatureTableOffset), m_bufTable));
}
public bool Validate(Validator v, string sIdentity, OTTable table)
{
bool bRet = true;
bool bFeatureListOk = true;
// check the FeatureRecord array length
if (m_offsetFeatureListTable + (uint)FieldOffsets.FeatureRecordArray + FeatureCount * 6 > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E._OTL_FeatureListTable_E_FeatureRecordArray_pastEOT, table.m_tag, sIdentity);
bFeatureListOk = false;
bRet = false;
}
// check that the FeatureRecord array is sorted alphabetically
if (FeatureCount > 1)
{
for (uint i = 0; i < FeatureCount - 1; i++)
{
FeatureRecord frCurr = GetFeatureRecord(i);
FeatureRecord frNext = GetFeatureRecord(i + 1);
if (frCurr.FeatureTag > frNext.FeatureTag)
{
v.Error(T.T_NULL, E._OTL_FeatureListTable_E_FeatureRecordArray_order, table.m_tag, sIdentity);
bFeatureListOk = false;
bRet = false;
break;
}
}
}
// check each FeatureRecord
for (uint i = 0; i < FeatureCount; i++)
{
FeatureRecord fr = GetFeatureRecord(i);
if (fr != null)
{
// check tag
if (!fr.FeatureTag.IsValid())
{
v.Error(T.T_NULL, E._OTL_FeatureListTable_E_FeatureRecord_tag, table.m_tag, sIdentity + ", FeatureRecord[" + i + "]");
bFeatureListOk = false;
bRet = false;
}
else if (!IsKnownFeatureTag(fr.FeatureTag))
{
v.Warning(T.T_NULL, W._OTL_FeatureListTable_W_FeatureRecord_tag, table.m_tag, sIdentity + ", FeatureRecord[" + i + "], tag = '" + fr.FeatureTag + "'");
}
// check offset
if (m_offsetFeatureListTable + fr.FeatureTableOffset > m_bufTable.GetLength())
{
v.Error(T.T_NULL, E._OTL_FeatureListTable_E_FeatureRecord_offset, table.m_tag, sIdentity + ", FeatureRecord[" + i + "]");
bFeatureListOk = false;
bRet = false;
}
else
{
// validate the feature table
FeatureTable_val ft = GetFeatureTable_val(fr);
bRet &= ft.Validate(v, sIdentity + ", FeatureRecord[" + i + "]" + "(" + (string)fr.FeatureTag + ")" + ", FeatureTable", table);
}
}
else
{
bFeatureListOk = false;
bRet = false;
}
}
if (bFeatureListOk)
{
v.Pass(T.T_NULL, P._OTL_FeatureListTable_P_valid, table.m_tag, sIdentity);
}
return(bRet);
}
public bool Add(FeatureRecord t)
{
throw new System.NotImplementedException();
}
public virtual FeatureTable GetFeatureTable(FeatureRecord fr)
{
return new FeatureTable((ushort)(m_offsetFeatureListTable + fr.FeatureTableOffset), m_bufTable);
}
public FeatureRecord GetFeatureRecord(uint i)
{
FeatureRecord fr = null;
if (i < FeatureCount)
{
uint offset = m_offsetFeatureListTable + (uint)FieldOffsets.FeatureRecordArray + i*6;
if (offset+6 <= m_bufTable.GetLength())
{
fr = new FeatureRecord();
fr.FeatureTag = m_bufTable.GetTag(offset);
fr.FeatureTableOffset = m_bufTable.GetUshort(offset + 4);
}
}
return fr;
}
public virtual FeatureTable GetFeatureTable(FeatureRecord fr)
{
return(new FeatureTable((ushort)(m_offsetFeatureListTable + fr.FeatureTableOffset), m_bufTable));
}