42 lines
1.6 KiB
JavaScript
42 lines
1.6 KiB
JavaScript
import { Nwid, Wwid } from "../../support/gr.mjs";
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import { gcFont } from "./gc.mjs";
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import { finalizeGlyphs } from "./glyphs.mjs";
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function assignGrAndCodeRank(glyphStore, ...flatteners) {
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for (const g of glyphStore.glyphs()) {
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g.codeRank = 0xffffffff;
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for (const c of glyphStore.flattenCodes(g, flatteners)) if (c < g.codeRank) g.codeRank = c;
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g.grRank = 0;
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for (let i = 0; i < flatteners.length; i++) if (flatteners[i].get(g)) g.grRank |= 1 << i;
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}
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}
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function assignSubRank(glyphStore) {
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let sr = 0;
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for (const g of glyphStore.glyphs()) g.subRank = sr++;
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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 validateMonospace(para, glyphStore) {
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let awSet = new Set();
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for (const [u, n, g] of glyphStore.encodedEntries()) {
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const aw = Math.round(g.advanceWidth || 0);
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if (aw > 0) awSet.add(aw);
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}
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if (para.forceMonospace && awSet.size > 1) {
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throw new Error("Unreachable! Fixed variant has wide characters");
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}
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if (!para.isQuasiProportional && !para.compLig && awSet.size > 2) {
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throw new Error("Unreachable! Building monospace with more than 2 character widths");
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}
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}
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export function finalizeFont(cache, para, glyphStore, excludedCodePoints, restFont) {
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assignGrAndCodeRank(glyphStore, Nwid, Wwid);
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assignSubRank(glyphStore);
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glyphStore = gcFont(glyphStore, excludedCodePoints, restFont);
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glyphStore = finalizeGlyphs(cache, para, glyphStore);
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validateMonospace(para, glyphStore);
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return glyphStore;
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}
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