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Use a TypedArray when building the "head" TrueType table

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This commit is contained in:
Jonas Jenwald 2026-04-13 12:35:39 +02:00
parent 5096982cfc
commit 2437f5f961
1 changed files with 26 additions and 33 deletions
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59
src/core/fonts.js
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@ -312,22 +312,6 @@ function string16(value) {
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function safeString16(value) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
typeof value === "number" && !Number.isNaN(value),
`safeString16: Unexpected input "${value}".`
);
}
// clamp value to the 16-bit int range
if (value > 0x7fff) {
value = 0x7fff;
} else if (value < -0x8000) {
value = -0x8000;
}
return String.fromCharCode((value >> 8) & 0xff, value & 0xff);
}
function setArray(data, pos, arr) {
data.set(arr, pos);
return pos + arr.length;
@ -3286,23 +3270,32 @@ class Font {
// Font header
builder.addTable(
"head",
"\x00\x01\x00\x00" + // Version number
"\x00\x00\x10\x00" + // fontRevision
"\x00\x00\x00\x00" + // checksumAdjustement
"\x5F\x0F\x3C\xF5" + // magicNumber
"\x00\x00" + // Flags
safeString16(unitsPerEm) + // unitsPerEM
"\x00\x00\x00\x00\x9e\x0b\x7e\x27" + // creation date
"\x00\x00\x00\x00\x9e\x0b\x7e\x27" + // modifification date
"\x00\x00" + // xMin
safeString16(properties.descent) + // yMin
"\x0F\xFF" + // xMax
safeString16(properties.ascent) + // yMax
string16(properties.italicAngle ? 2 : 0) + // macStyle
"\x00\x11" + // lowestRecPPEM
"\x00\x00" + // fontDirectionHint
"\x00\x00" + // indexToLocFormat
"\x00\x00" // glyphDataFormat
(function fontTableHead() {
const dateArr = [0x00, 0x00, 0x00, 0x00, 0x9e, 0x0b, 0x7e, 0x27];
const data = new Uint8Array(54),
view = new DataView(data.buffer);
let pos = 0;
pos = setArray(data, pos, [0x00, 0x01, 0x00, 0x00]); // Version number
pos = setArray(data, pos, [0x00, 0x00, 0x10, 0x00]); // fontRevision
pos += 4; // checksumAdjustement, skip redundant "\x00\x00\x00\x00"
pos = setArray(data, pos, [0x5f, 0x0f, 0x3c, 0xf5]); // magicNumber
pos += 2; // Flags, skip redundant "\x00\x00"
pos = setSafeInt16(view, pos, unitsPerEm); // unitsPerEM
pos = setArray(data, pos, dateArr); // creation date
pos = setArray(data, pos, dateArr); // modifification date
pos += 2; // xMin, skip redundant "\x00\x00"
pos = setSafeInt16(view, pos, properties.descent); // yMin
pos = setArray(data, pos, [0x0f, 0xff]); // xMax
pos = setSafeInt16(view, pos, properties.ascent); // yMax
pos = setInt16(view, pos, properties.italicAngle ? 2 : 0); // macStyle
setArray(data, pos, [0x00, 0x11]); // lowestRecPPEM
// fontDirectionHint, skip redundant "\x00\x00"
// indexToLocFormat, skip redundant "\x00\x00"
// glyphDataFormat, skip redundant "\x00\x00"
return data;
})()
);
// Horizontal header