56 lines
1.6 KiB
JavaScript
56 lines
1.6 KiB
JavaScript
import ttfaRanges from "../../generated/ttfa-ranges.mjs";
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import * as Gr from "../../support/gr.mjs";
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import { ArrayUtil } from "../../support/utils.mjs";
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export async function generateTtfaControls(gsOrig, gs) {
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let ttfaControls = [];
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for (const alignment of ttfaRanges) {
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ttfaControls.push(generateTTFAAlignments(alignment, gsOrig, gs));
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}
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return ttfaControls;
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}
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function generateTTFAAlignments(alignment, gsOrig, gsTtf) {
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let collectedGlyphs = new Map();
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for (const [lo, hi] of alignment.ranges) {
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for (let lch = lo; lch <= hi; lch++) {
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const go = gsOrig.queryByUnicode(lch);
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if (!go) continue;
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const gd = gsTtf.queryBySourceGlyph(go);
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if (!gd) continue;
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collectedGlyphs.set(go, gd);
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}
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}
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for (;;) {
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let sizeBefore = collectedGlyphs.size;
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for (const [go, gd] of collectedGlyphs) {
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const cvs = Gr.AnyCv.query(go);
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for (const gr of cvs) {
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const gnLinked = gr.get(go);
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if (!gnLinked) continue;
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const goLinked = gsOrig.queryByName(gnLinked);
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if (!goLinked) continue;
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const gdLinked = gsTtf.queryBySourceGlyph(goLinked);
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if (!gdLinked) continue;
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collectedGlyphs.set(goLinked, gdLinked);
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}
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}
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let sizeAfter = collectedGlyphs.size;
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if (sizeAfter <= sizeBefore) break;
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}
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const gOrd = gsTtf.decideOrder();
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const glyphIndices = Array.from(collectedGlyphs.values()).map(gd => gOrd.reverse(gd));
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const glyphIndicesRangesStr = ArrayUtil.toRanges(glyphIndices)
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.map(([lo, hi]) => (lo === hi ? `${lo}` : `${lo}-${hi}`))
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.join(", ");
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const styleAdjustLine = `${alignment.scriptTag} ${alignment.featureTag} @ ${glyphIndicesRangesStr}`;
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return styleAdjustLine;
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}
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