private List <int> ApplyGsubFeature(ScriptFeature scriptFeature, List <int> originalGlyphs)
{
GlyphArraySplitter glyphArraySplitter = new GlyphArraySplitterRegexImpl(scriptFeature.AllGlyphIdsForSubstitution);
List <List <int> > tokens = glyphArraySplitter.Split(originalGlyphs);
List <int> gsubProcessedGlyphs = new List <int>();
foreach (List <int> chunk in tokens)
{
if (scriptFeature.CanReplaceGlyphs(chunk))
{
// gsub system kicks in, you get the glyphId directly
int glyphId = scriptFeature.GetReplacementForGlyphs(chunk);
gsubProcessedGlyphs.Add(glyphId);
}
else
{
gsubProcessedGlyphs.AddAll(chunk);
}
}
Debug.WriteLine($"debug: originalGlyphs: {originalGlyphs}, gsubProcessedGlyphs: {gsubProcessedGlyphs}");
return(gsubProcessedGlyphs);
}
private List <int> GetBeforeHalfGlyphIds()
{
List <int> glyphIds = new List <int>();
foreach (char character in BEFORE_HALF_CHARS)
{
glyphIds.Add(GetGlyphId(character));
}
if (gsubData.IsFeatureSupported(INIT_FEATURE))
{
ScriptFeature feature = gsubData.GetFeature(INIT_FEATURE);
foreach (List <int> glyphCluster in feature.AllGlyphIdsForSubstitution)
{
glyphIds.Add(feature.GetReplacementForGlyphs(glyphCluster));
}
}
return(glyphIds);
}
public List <int> ApplyTransforms(List <int> originalGlyphIds)
{
List <int> intermediateGlyphsFromGsub = originalGlyphIds;
foreach (string feature in FEATURES_IN_ORDER)
{
if (!gsubData.IsFeatureSupported(feature))
{
Debug.WriteLine("debug: the feature " + feature + " was not found");
continue;
}
Debug.WriteLine("debug: applying the feature " + feature);
ScriptFeature scriptFeature = gsubData.GetFeature(feature);
intermediateGlyphsFromGsub = ApplyGsubFeature(scriptFeature, intermediateGlyphsFromGsub);
}
return(RepositionGlyphs(intermediateGlyphsFromGsub));
}
