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Use a TypedArray when building the "hhea" TrueType table

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This commit is contained in:
Jonas Jenwald 2026-04-13 11:59:14 +02:00
parent 0c789ecc97
commit 5096982cfc
1 changed files with 42 additions and 17 deletions
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59
src/core/fonts.js
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@ -61,6 +61,7 @@ import { compileFontInfo } from "./obj_bin_transform_core.js";
import { FontRendererFactory } from "./font_renderer.js";
import { getFontBasicMetrics } from "./metrics.js";
import { GlyfTable } from "./glyf.js";
import { MathClamp } from "../shared/math_clamp.js";
import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
import { Stream } from "./stream.js";
import { Type1Font } from "./type1_font.js";
@ -343,6 +344,18 @@ function setInt16(view, pos, val) {
return pos + 2;
}
function setSafeInt16(view, pos, val) {
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
assert(
typeof val === "number" && !Number.isNaN(val),
`safeString16: Unexpected input "${val}".`
);
}
// clamp value to the 16-bit int range
view.setInt16(pos, MathClamp(val, -0x8000, 0x7fff));
return pos + 2;
}
function isTrueTypeFile(file) {
const header = file.peekBytes(4),
str = bytesToString(header);
@ -3295,23 +3308,35 @@ class Font {
// Horizontal header
builder.addTable(
"hhea",
"\x00\x01\x00\x00" + // Version number
safeString16(properties.ascent) + // Typographic Ascent
safeString16(properties.descent) + // Typographic Descent
"\x00\x00" + // Line Gap
"\xFF\xFF" + // advanceWidthMax
"\x00\x00" + // minLeftSidebearing
"\x00\x00" + // minRightSidebearing
"\x00\x00" + // xMaxExtent
safeString16(properties.capHeight) + // caretSlopeRise
safeString16(Math.tan(properties.italicAngle) * properties.xHeight) + // caretSlopeRun
"\x00\x00" + // caretOffset
"\x00\x00" + // -reserved-
"\x00\x00" + // -reserved-
"\x00\x00" + // -reserved-
"\x00\x00" + // -reserved-
"\x00\x00" + // metricDataFormat
string16(numGlyphs) // Number of HMetrics
(function fontTableHhea() {
const data = new Uint8Array(36),
view = new DataView(data.buffer);
let pos = 0;
pos = setArray(data, pos, [0x00, 0x01, 0x00, 0x00]); // Version number
pos = setSafeInt16(view, pos, properties.ascent); // Typographic Ascent
pos = setSafeInt16(view, pos, properties.descent); // Typographic Descent
pos += 2; // Line Gap, skip redundant "\x00\x00"
pos = setArray(data, pos, [0xff, 0xff]); // advanceWidthMax
pos += 2; // minLeftSidebearing, skip redundant "\x00\x00"
pos += 2; // minRightSidebearing, skip redundant "\x00\x00"
pos += 2; // xMaxExtent, skip redundant "\x00\x00"
pos = setSafeInt16(view, pos, properties.capHeight); // caretSlopeRise
pos = setSafeInt16(
view,
pos,
Math.tan(properties.italicAngle) * properties.xHeight
); // caretSlopeRun
pos += 2; // caretOffset, skip redundant "\x00\x00"
pos += 2; // -reserved-, skip redundant "\x00\x00"
pos += 2; // -reserved-, skip redundant "\x00\x00"
pos += 2; // -reserved-, skip redundant "\x00\x00"
pos += 2; // -reserved-, skip redundant "\x00\x00"
pos += 2; // metricDataFormat, skip redundant "\x00\x00"
setInt16(view, pos, numGlyphs); // Number of HMetrics
return data;
})()
);
// Horizontal metrics