80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
import fs from "fs";
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import { FontIo, Ot } from "ot-builder";
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import { assignFontNames, createNamingDictFromArgv } from "./gen/meta/naming.mjs";
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export default main;
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async function main(argv) {
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const font = await readTTF(argv);
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const naming = createNamingDictFromArgv(argv);
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assignFontNames(font, naming, false);
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switch (argv.shape.spacing) {
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case "term":
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deriveTerm(font);
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break;
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case "fixed":
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deriveTerm(font);
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deriveFixed(font);
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break;
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}
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await saveTTF(argv, font);
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}
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// To derive -Term variants, simply apply NWID
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function deriveTerm(font) {
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const gsub = font.gsub;
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let nwidMap = new Map();
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for (const feature of gsub.features) {
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if (feature.tag !== "NWID") continue;
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for (const lookup of feature.lookups) {
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if (!(lookup instanceof Ot.Gsub.Single)) continue;
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for (const [from, to] of lookup.mapping) {
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nwidMap.set(from, to);
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}
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}
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}
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for (const [ch, g] of [...font.cmap.unicode.entries()]) {
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const narrow = nwidMap.get(g);
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if (narrow) font.cmap.unicode.set(ch, narrow);
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}
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for (const [ch, vs, g] of [...font.cmap.vs.entries()]) {
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const narrow = nwidMap.get(g);
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if (narrow) font.cmap.vs.set(ch, vs, narrow);
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}
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}
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// In FontConfig, a font is considered "monospace" if and only if all encoded non-combining
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// characters (AW > 0) have the same width. We use this method to validate whether our
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// "Fixed" subfamilies are properly built.
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function deriveFixed(font) {
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const unitWidth = font.os2.xAvgCharWidth;
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for (const [ch, g] of [...font.cmap.unicode.entries()]) {
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const advanceWidth = g.horizontal.end - g.horizontal.start;
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if (!(advanceWidth === 0 || advanceWidth === unitWidth)) font.cmap.unicode.delete(ch);
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}
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for (const [ch, vs, g] of [...font.cmap.vs.entries()]) {
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const advanceWidth = g.horizontal.end - g.horizontal.start;
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if (!(advanceWidth === 0 || advanceWidth === unitWidth)) font.cmap.vs.delete(ch, vs);
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}
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}
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async function readTTF(argv) {
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const buf = await fs.promises.readFile(argv.i);
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const sfnt = FontIo.readSfntOtf(buf);
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const font = FontIo.readFont(sfnt, Ot.ListGlyphStoreFactory);
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return font;
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}
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async function saveTTF(argv, font) {
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const sfnt = FontIo.writeFont(font, {
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glyphStore: { statOs2XAvgCharWidth: false },
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generateDummyDigitalSignature: true
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});
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const buf = FontIo.writeSfntOtf(sfnt);
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await fs.promises.writeFile(argv.o, buf);
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}
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