public void DoSubstitution(IGlyphIndexList glyphIndexList)
{
// Rebuild tables if configuration changed
if (_mustRebuildTables)
{
RebuildTables();
_mustRebuildTables = false;
}
// Iterate over lookups, then over glyphs, as explained in the spec:
// "During text processing, a client applies a lookup to each glyph
// in the string before moving to the next lookup."
// https://www.microsoft.com/typography/otspec/gsub.htm
foreach (GSubLkContext lookupCtx in _lookupTables)
{
GSUB.LookupTable lookupTable = lookupCtx.lookup;
lookupCtx.SetGlyphCount(glyphIndexList.Count);
for (int pos = 0; pos < glyphIndexList.Count; ++pos)
{
if (!lookupCtx.WillCheckThisGlyph(pos))
{
continue;
}
lookupTable.DoSubstitutionAt(glyphIndexList, pos, glyphIndexList.Count - pos);
}
}
}
public void DoSubstitution(IGlyphIndexList outputCodePoints)
{
if (lookupTables == null)
{
return;
} //early exit if no lookup tables
//
//load
int j = lookupTables.Count;
for (int i = 0; i < j; ++i)
{
GSUB.LookupTable lookupTable = lookupTables[i];
//
if (!EnableLigation &&
lookupTable.ForUseWithFeatureId == Features.liga.shortname)
{
//skip this feature
continue;
}
lookupTable.DoSubstitution(outputCodePoints, 0, outputCodePoints.Count);
}
}
public GSubLkContext(GSUB.LookupTable lookup)
{
this.lookup = lookup;
}
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));
}
}
}
}
