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https://github.com/2234839/web-font.git
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8a7efea9d0
GPOS/GSUB 表类 read 原用 reader.readBytes (= new Uint8Array(view.buffer, off, len).slice())， .slice() 拷贝整个表字节（初夏 GPOS 68KB、GSUB 31KB）。V8 中 68KB slice 耗 ~40μs， 而 subarray 零拷贝仅 ~0.3μs（130× 差距）。 GPOS/GSUB 是原始字节透传：subsetGPOS/subsetGSUB 只读 OTReader + 写全新 OTWriter， write 只 writeBytes 只读，optimize 不碰，整个 read→optimize→subset→write 生命周期 从不原地修改底层字节，故可安全返回共享 ArrayBuffer 的 subarray 视图。 初夏 full read 0.124→0.063ms (-49%)，readBuffer 0.165→0.098ms。 全基准 SSIM 与输出字节完全不变。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
62 lines
2.3 KiB
TypeScript
62 lines
2.3 KiB
TypeScript
import fs from 'node:fs';
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import { Font } from './vendor/fonteditor-core/lib/ttf/font.js';
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import { probeGsubAndCmap, collectReachableGsubTargets } from './backend/font_util/gsub-probe.js';
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const fontBuf = fs.readFileSync('/mnt/d/字体资源/初夏明朝/初夏明朝-Regular.ttf');
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const ab = fontBuf.buffer.slice(fontBuf.byteOffset, fontBuf.byteOffset + fontBuf.byteLength) as ArrayBuffer;
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const text = '，。！？、；：“”‘’';
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const codePoints = Array.from(text);
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const option = { sourceType: 'ttf' as const, outType: 'woff2' as const };
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function timeOnce<T>(label: string, fn: () => T, runs = 1): T {
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// warmup
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for (let i = 0; i < 3; i++) fn();
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const t0 = performance.now();
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let res: T;
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for (let i = 0; i < runs; i++) res = fn();
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const t1 = performance.now();
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console.log(`${label}: ${((t1 - t0) / runs).toFixed(2)}ms`);
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return res!;
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}
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// 阶段拆解（best of 5）
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function median(arr: number[]) { return arr.slice().sort((a,b)=>a-b)[Math.floor(arr.length/2)]; }
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function bench(label: string, fn: () => void, iters = 7) {
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for (let i = 0; i < 3; i++) fn(); // warmup
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const ts: number[] = [];
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for (let i = 0; i < iters; i++) {
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const t0 = performance.now();
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fn();
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ts.push(performance.now() - t0);
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}
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console.log(`${label}: ${median(ts).toFixed(3)}ms (min ${Math.min(...ts).toFixed(3)})`);
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}
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// 1. probe
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bench('1.probe', () => probeGsubAndCmap(ab, codePoints, option.sourceType));
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// 2. Font.create
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bench('2.Font.create', () => Font.create(ab, { type: option.sourceType, subset: codePoints as any, kerning: true }));
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// 完整 Font.create 拿到对象
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const font = Font.create(ab, { type: option.sourceType, subset: codePoints as any, kerning: true });
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// 3. optimize
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bench('3.optimize', () => (font as any).optimize());
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// 4. write (woff2)
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const optimized = (font as any).optimize();
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bench('5.write(woff2)', () => {
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const f = Font.create(ab, { type: option.sourceType, subset: codePoints as any, kerning: true });
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const o = (f as any).optimize();
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o.write({ type: 'woff2', hinting: false } as any);
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});
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// 端到端对比
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bench('E2E', () => {
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const f = Font.create(ab, { type: option.sourceType, subset: codePoints as any, kerning: true });
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const o = (f as any).optimize();
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o.write({ type: 'woff2', hinting: false } as any);
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}, 5);
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