static void CollectScriptTable(ScriptList scList, Dictionary <string, ScriptLang> output)
{
if (scList == null)
{
return;
}
//
foreach (var kv in scList)
{
ScriptTable scTable = kv.Value;
//default and others
{
ScriptTable.LangSysTable langSys = scTable.defaultLang;
ScriptLang sclang = new ScriptLang(scTable.ScriptTagName, langSys.LangSysTagIdenString);
string key = sclang.ToString();
if (!output.ContainsKey(key))
{
output.Add(key, sclang);
}
}
//
if (scTable.langSysTables != null && scTable.langSysTables.Length > 0)
{
foreach (ScriptTable.LangSysTable langSys in scTable.langSysTables)
{
var pair = new ScriptLang(scTable.ScriptTagName, langSys.LangSysTagIdenString);
string key = pair.ToString();
if (!output.ContainsKey(key))
{
output.Add(key, pair);
}
}
}
}
}
private void RebuildTables()
{
_lookupTables.Clear();
// check if this lang has
GSUB gsubTable = _typeface.GSUBTable;
ScriptTable scriptTable = gsubTable.ScriptList[_language];
if (scriptTable == null)
{
return;
}
ScriptTable.LangSysTable selectedLang = null;
if (scriptTable.langSysTables != null && scriptTable.langSysTables.Length > 0)
{
// TODO: review here
selectedLang = scriptTable.langSysTables[0];
}
else
{
selectedLang = scriptTable.defaultLang;
}
if (selectedLang.HasRequireFeature)
{
// TODO: review here
}
if (selectedLang.featureIndexList == null)
{
return;
}
// Enumerate features we want and add the corresponding lookup tables
foreach (int featureIndex in selectedLang.featureIndexList)
{
FeatureList.FeatureTable feature = gsubTable.FeatureList.featureTables[featureIndex];
bool featureIsNeeded = false;
switch (feature.TagName)
{
case "ccmp": // glyph composition/decomposition
// this version we implement ccmp
featureIsNeeded = EnableComposition;
break;
case "liga": // Standard Ligatures --enable by default
featureIsNeeded = EnableLigation;
break;
}
if (featureIsNeeded)
{
foreach (ushort lookupIndex in feature.LookupListIndices)
{
_lookupTables.Add(gsubTable.LookupList[lookupIndex]);
}
}
}
}
public GlyphSetPosition(Typeface typeface, string lang)
{
this.Lang = lang;
this.typeface = typeface;
//check if this lang has
this.gposTable = typeface.GPOSTable;
if (gposTable == null)
{
return;
}
ScriptTable scriptTable = gposTable.ScriptList[lang];
//---------
if (scriptTable == null)
{
return;
} // early exit if no lookup tables
//---------
ScriptTable.LangSysTable defaultLang = scriptTable.defaultLang;
if (defaultLang == null)
{
return;
} // early exit if no default language
if (defaultLang.HasRequireFeature)
{
}
//other feature
if (defaultLang.featureIndexList != null)
{
//get features
var features = new List <FeatureList.FeatureTable>();
for (int i = 0; i < defaultLang.featureIndexList.Length; ++i)
{
FeatureList.FeatureTable feature = gposTable.FeatureList.featureTables[defaultLang.featureIndexList[i]];
switch (feature.TagName)
{
case "mark": //mark=> mark to base
case "mkmk": //mkmk => mark to mask
//current version we implement this 2 features
features.Add(feature);
break;
case "kern":
//test with Candara font
features.Add(feature);
//If palt is activated, there is no requirement that kern must also be activated.
//If kern is activated, palt must also be activated if it exists.
//https://www.microsoft.com/typography/OTSpec/features_pt.htm#palt
break;
case "palt":
break;
default:
break;
}
}
//-----------------------
lookupTables = new List <GPOS.LookupTable>();
int j = features.Count;
for (int i = 0; i < j; ++i)
{
FeatureList.FeatureTable feature = features[i];
foreach (ushort lookupIndex in feature.LookupListIndices)
{
lookupTables.Add(gposTable.LookupList[lookupIndex]);
}
}
}
}
public GlyphSetPosition(Typeface typeface, string lang)
{
this.Lang = lang;
this.typeface = typeface;
//check if this lang has
this.gposTable = typeface.GPOSTable;
if (gposTable == null)
{
return;
}
ScriptTable scriptTable = gposTable.ScriptList.FindScriptTable(lang);
//---------
if (scriptTable == null)
{
return;
} //early exit if no lookup tables
//---------
ScriptTable.LangSysTable defaultLang = scriptTable.defaultLang;
if (defaultLang.HasRequireFeature)
{
}
//other feature
if (defaultLang.featureIndexList != null)
{
//get features
var features = new List <FeatureList.FeatureTable>();
for (int i = 0; i < defaultLang.featureIndexList.Length; ++i)
{
FeatureList.FeatureTable feature = gposTable.FeatureList.featureTables[defaultLang.featureIndexList[i]];
switch (feature.TagName)
{
case "mark": //mark=> mark to base
case "mkmk": //mkmk => mark to mask
//current version we implement this 2 features
features.Add(feature);
break;
default:
{
}
break;
}
}
//-----------------------
lookupTables = new List <GPOS.LookupTable>();
int j = features.Count;
for (int i = 0; i < j; ++i)
{
FeatureList.FeatureTable feature = features[i];
ushort[] lookupListIndices = feature.LookupListIndice;
foreach (ushort lookupIndex in lookupListIndices)
{
lookupTables.Add(gposTable.GetLookupTable(lookupIndex));
}
}
}
}
public GlyphSubStitution(Typeface typeface, string lang)
{
this.EnableLigation = true;//enable by default
this.Lang = lang;
this.typeface = typeface;
//check if this lang has
gsubTable = typeface.GSUBTable;
ScriptTable scriptTable = gsubTable.ScriptList.FindScriptTable(lang);
//---------
if (scriptTable == null)
{
return;
} //early exit if no lookup tables
//---------
ScriptTable.LangSysTable selectedLang = null;
if (scriptTable.langSysTables != null && scriptTable.langSysTables.Length > 0)
{
//TODO: review here
selectedLang = scriptTable.langSysTables[0];
}
else
{
selectedLang = scriptTable.defaultLang;
}
if (selectedLang.HasRequireFeature)
{
//TODO: review here
}
//other feature
if (selectedLang.featureIndexList != null)
{
//get features
var features = new List <FeatureList.FeatureTable>();
for (int i = 0; i < selectedLang.featureIndexList.Length; ++i)
{
FeatureList.FeatureTable feature = gsubTable.FeatureList.featureTables[selectedLang.featureIndexList[i]];
switch (feature.TagName)
{
case "ccmp": //glyph composition/decomposition
//this version we implement ccmp
features.Add(feature);
break;
case "liga":
//Standard Ligatures --enable by default
features.Add(feature);
break;
}
}
//-----------------------
lookupTables = new List <GSUB.LookupTable>();
int j = features.Count;
for (int i = 0; i < j; ++i)
{
FeatureList.FeatureTable feature = features[i];
ushort[] lookupListIndices = feature.LookupListIndice;
foreach (ushort lookupIndex in lookupListIndices)
{
GSUB.LookupTable lktable = gsubTable.GetLookupTable(lookupIndex);
lktable.ForUseWithFeatureId = feature.TagName;
lookupTables.Add(gsubTable.GetLookupTable(lookupIndex));
}
}
}
}
public GlyphSetPosition(Typeface typeface, uint scriptTag, uint langTag)
{
this.ScriptTag = scriptTag; //script tag
this.LangTag = langTag; //lang tag
//check if this lang has
_gposTable = typeface.GPOSTable;
if (_gposTable == null)
{
return;
}
ScriptTable scriptTable = _gposTable.ScriptList[scriptTag];
if (scriptTable == null)
{
return;
} // early exit if no lookup tables
ScriptTable.LangSysTable selectedLang = scriptTable.defaultLang;
if (selectedLang == null)
{
return; //no default
}
if (LangTag != 0 && scriptTable.langSysTables != null) //use default
{
//find matching lang
for (int i = 0; i < scriptTable.langSysTables.Length; ++i)
{
if (scriptTable.langSysTables[i].langSysTagIden == LangTag)
{
//found
selectedLang = scriptTable.langSysTables[i];
break;
}
}
}
#if DEBUG
dbugTypeface = typeface;
if (selectedLang.HasRequireFeature)
{
System.Diagnostics.Debugger.Break();
}
#endif
//other feature
if (selectedLang.featureIndexList == null)
{
return;
} // early exit
//---------
//get features
_lookupTables = new List <GPOS.LookupTable>();
for (int i = 0; i < selectedLang.featureIndexList.Length; ++i)
{
FeatureList.FeatureTable feature = _gposTable.FeatureList.featureTables[selectedLang.featureIndexList[i]];
bool includeThisFeature = false;
switch (feature.TagName)
{
case "mark": //mark=> mark to base
case "mkmk": //mkmk => mark to mask
//current version we implement this 2 features
includeThisFeature = true;
break;
case "kern":
//test with Candara font
includeThisFeature = true;
//If palt is activated, there is no requirement that kern must also be activated.
//If kern is activated, palt must also be activated if it exists.
//https://www.microsoft.com/typography/OTSpec/features_pt.htm#palt
break;
//case "palt":
// break;
case "abvm":
case "blwm":
case "dist":
includeThisFeature = true;
break;
default:
System.Diagnostics.Debug.WriteLine("gpos_skip_tag:" + feature.TagName);
break;
}
if (includeThisFeature)
{
foreach (ushort lookupIndex in feature.LookupListIndices)
{
_lookupTables.Add(_gposTable.LookupList[lookupIndex]);
}
}
}
}
