|
|
import * as AATFeatureMap from './AATFeatureMap';
|
|
|
import * as Script from '../layout/Script';
|
|
|
import AATMorxProcessor from './AATMorxProcessor';
|
|
|
|
|
|
export default class AATLayoutEngine {
|
|
|
constructor(font) {
|
|
|
this.font = font;
|
|
|
this.morxProcessor = new AATMorxProcessor(font);
|
|
|
this.fallbackPosition = false;
|
|
|
}
|
|
|
|
|
|
substitute(glyphRun) {
|
|
|
// AAT expects the glyphs to be in visual order prior to morx processing,
|
|
|
// so reverse the glyphs if the script is right-to-left.
|
|
|
if (glyphRun.direction === 'rtl') {
|
|
|
glyphRun.glyphs.reverse();
|
|
|
}
|
|
|
|
|
|
this.morxProcessor.process(glyphRun.glyphs, AATFeatureMap.mapOTToAAT(glyphRun.features));
|
|
|
}
|
|
|
|
|
|
getAvailableFeatures(script, language) {
|
|
|
return AATFeatureMap.mapAATToOT(this.morxProcessor.getSupportedFeatures());
|
|
|
}
|
|
|
|
|
|
stringsForGlyph(gid) {
|
|
|
let glyphStrings = this.morxProcessor.generateInputs(gid);
|
|
|
let result = new Set;
|
|
|
|
|
|
for (let glyphs of glyphStrings) {
|
|
|
this._addStrings(glyphs, 0, result, '');
|
|
|
}
|
|
|
|
|
|
return result;
|
|
|
}
|
|
|
|
|
|
_addStrings(glyphs, index, strings, string) {
|
|
|
let codePoints = this.font._cmapProcessor.codePointsForGlyph(glyphs[index]);
|
|
|
|
|
|
for (let codePoint of codePoints) {
|
|
|
let s = string + String.fromCodePoint(codePoint);
|
|
|
if (index < glyphs.length - 1) {
|
|
|
this._addStrings(glyphs, index + 1, strings, s);
|
|
|
} else {
|
|
|
strings.add(s);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
