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Merge pull request #21072 from Snuffleupagus/hmtx-TypedArray

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Use a TypedArray when building the "hmtx" font table
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Tim van der Meij 2026-04-09 21:26:45 +02:00 committed by GitHub
commit ab124db046
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1 changed files with 12 additions and 6 deletions
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18
src/core/fonts.js
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@ -3311,19 +3311,25 @@ class Font {
"hmtx", "hmtx",
(function fontFieldsHmtx() { (function fontFieldsHmtx() {
const charstrings = font.charstrings; const charstrings = font.charstrings;
const cffWidths = font.cff ? font.cff.widths : null; const cffWidths = font.cff?.widths ?? null;
let hmtx = "\x00\x00\x00\x00"; // Fake .notdef
const data = new Uint8Array(numGlyphs * 4);
// Fake .notdef (width=0 and lsb=0) first, skip redundant assignment.
let pos = 4;
for (let i = 1, ii = numGlyphs; i < ii; i++) { for (let i = 1, ii = numGlyphs; i < ii; i++) {
let width = 0; let width = 0;
if (charstrings) { if (charstrings) {
const charstring = charstrings[i - 1]; width = charstrings[i - 1].width || 0;
width = "width" in charstring ? charstring.width : 0;
} else if (cffWidths) { } else if (cffWidths) {
width = Math.ceil(cffWidths[i] || 0); width = Math.ceil(cffWidths[i] || 0);
} }
hmtx += string16(width) + string16(0); data[pos++] = (width >> 8) & 0xff;
data[pos++] = width & 0xff;
// Use lsb=0, skip redundant assignment.
pos += 2;
} }
return hmtx; return data;
})() })()
); );