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Add some unicode mapping for ligatures when writing the cmap table in the font (bug 1946181)

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Calixte Denizet 2025-02-06 10:51:15 +01:00
parent 90a5c37cb0
commit 185ec1faf6
1 changed files with 19 additions and 1 deletions
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20
src/core/fonts.js
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@ -485,6 +485,8 @@ function adjustMapping(charCodeToGlyphId, hasGlyph, newGlyphZeroId, toUnicode) {
const isInPrivateArea = code =>
(PRIVATE_USE_AREAS[0][0] <= code && code <= PRIVATE_USE_AREAS[0][1]) ||
(PRIVATE_USE_AREAS[1][0] <= code && code <= PRIVATE_USE_AREAS[1][1]);
let LIGATURE_TO_UNICODE = null;
for (const originalCharCode in charCodeToGlyphId) {
let glyphId = charCodeToGlyphId[originalCharCode];
// For missing glyphs don't create the mappings so the glyph isn't
@ -514,7 +516,23 @@ function adjustMapping(charCodeToGlyphId, hasGlyph, newGlyphZeroId, toUnicode) {
// glyph ids to the correct unicode.
let unicode = toUnicode.get(originalCharCode);
if (typeof unicode === "string") {
unicode = unicode.codePointAt(0);
if (unicode.length === 1) {
unicode = unicode.codePointAt(0);
} else {
if (!LIGATURE_TO_UNICODE) {
LIGATURE_TO_UNICODE = new Map();
// The code range [0xfb00, 0xfb4f] contains some ligature characters
// but not all.
// See https://www.compart.com/en/unicode/block/U+FB00.
for (let i = 0xfb00; i <= 0xfb4f; i++) {
const normalized = String.fromCharCode(i).normalize("NFKD");
if (normalized.length > 1) {
LIGATURE_TO_UNICODE.set(normalized, i);
}
}
}
unicode = LIGATURE_TO_UNICODE.get(unicode) || unicode.codePointAt(0);
}
}
if (unicode && !isInPrivateArea(unicode) && !usedGlyphIds.has(glyphId)) {
toUnicodeExtraMap.set(unicode, glyphId);