${text.replace(/ `; res.writeHead(200, { "Content-Type": "text/html; charset=utf-8" }); res.end(html); return; } if (path.startsWith("/fonts/")) { const fontKey = decodeURIComponent(path.slice("/fonts/".length)); let buf = fontStore.get(fontKey); if (!buf) buf = fontStore.get(fontKey + ".ttf"); if (!buf) buf = fontStore.get(fontKey + ".otf"); if (!buf) buf = fontStore.get(fontKey + ".woff2"); if (buf) { const ext = fontKey.endsWith(".woff2") ? "font/woff2" : fontKey.endsWith(".otf") ? "font/opentype" : "font/ttf"; res.writeHead(200, { "Content-Type": ext, "Content-Length": buf.length, "Cache-Control": "public, max-age=31536000, immutable" }); res.end(buf); return; } } res.writeHead(404); res.end("not found"); }); server.listen(0, "127.0.0.1", () => { const addr = server.address() as { port: number }; resolve({ server, port: addr.port }); }); }); } // ======== 无头浏览器渲染 ======== async function renderTextViaBrowser( page: Page, baseUrl: string, fontFamily: string, text: string, fontSize: number, fontFormat: string = "truetype", ): Promise<{ pixels: Uint8Array; screenshot: Buffer; inkPixels: number }> { const charWidth = Math.ceil(fontSize * 1.5); const width = text.length * charWidth + 20; const height = Math.ceil(fontSize * 1.5); const renderUrl = `${baseUrl}/render?font=${encodeURIComponent(fontFamily)}&text=${encodeURIComponent(text)}&size=${fontSize}&width=${width}&height=${height}&format=${encodeURIComponent(fontFormat)}`; await page.goto("about:blank"); await page.setViewport({ width, height }); await page.goto(renderUrl, { waitUntil: "load", timeout: 60000 }); await page.waitForFunction(() => document.title === "ready" || document.title.startsWith("error="), { timeout: 60000 }); const title = await page.title(); if (title.startsWith("error=")) { throw new Error(`字体渲染失败 (${fontFamily}): ${title.slice(6)}`); } /** * DOM 渲染 + puppeteer 截图（而非 canvas 直接绘制） * 截图后用 pngjs 解码获取像素数据用于 SSIM 计算 */ const screenshot = await page.screenshot({ type: "png", clip: { x: 0, y: 0, width, height } }); const png = PNG.sync.read(screenshot); const pixels = new Uint8Array(png.data); let inkPixels = 0; for (let i = 0; i < pixels.length; i += 4) { if (pixels[i] < 128) inkPixels++; } if (inkPixels === 0) { throw new Error(`字体渲染无墨水像素 (${fontFamily})，字体可能未正确加载`); } return { pixels, screenshot: Buffer.from(screenshot), inkPixels }; } /** * 计算两张图片的标准 SSIM (Wang et al. 2004) * 使用 11x11 均匀滑动窗口 + 积分图加速，返回 0~1 */ function calculateSSIM(a: Uint8Array, b: Uint8Array): number { if (a.length !== b.length) return 0; const width = Math.sqrt(a.length / 4) | 0; const height = (a.length / 4 / width) | 0; if (width === 0 || height === 0) return 0; /** 转灰度并提取到独立数组 */ const N = width * height; const grayA = new Float64Array(N); const grayB = new Float64Array(N); for (let i = 0; i < N; i++) { const idx = i * 4; grayA[i] = 0.299 * a[idx] + 0.587 * a[idx + 1] + 0.114 * a[idx + 2]; grayB[i] = 0.299 * b[idx] + 0.587 * b[idx + 1] + 0.114 * b[idx + 2]; } /** 构建积分图: S(x,y) = sum of gray[0..x-1, 0..y-1] */ const w1 = width + 1; const intA = new Float64Array(w1 * (height + 1)); const intA2 = new Float64Array(w1 * (height + 1)); const intB = new Float64Array(w1 * (height + 1)); const intB2 = new Float64Array(w1 * (height + 1)); const intAB = new Float64Array(w1 * (height + 1)); for (let y = 0; y < height; y++) { const rowOff = y * width; const irowOff = (y + 1) * w1; for (let x = 0; x < width; x++) { const va = grayA[rowOff + x]; const vb = grayB[rowOff + x]; const ip = irowOff + x + 1; intA[ip] = va + intA[ip - 1] + intA[ip - w1] - intA[ip - w1 - 1]; intA2[ip] = va * va + intA2[ip - 1] + intA2[ip - w1] - intA2[ip - w1 - 1]; intB[ip] = vb + intB[ip - 1] + intB[ip - w1] - intB[ip - w1 - 1]; intB2[ip] = vb * vb + intB2[ip - 1] + intB2[ip - w1] - intB2[ip - w1 - 1]; intAB[ip] = va * vb + intAB[ip - 1] + intAB[ip - w1] - intAB[ip - w1 - 1]; } } /** * 从积分图计算矩形区域 [x1, x2) x [y1, y2) 的和 * 矩形包含 (x2-x1) * (y2-y1) 个像素 */ const rectSum = (img: Float64Array, x1: number, y1: number, x2: number, y2: number) => img[y2 * w1 + x2] - img[y1 * w1 + x2] - img[y2 * w1 + x1] + img[y1 * w1 + x1]; /** 11x11 窗口, 半径=5 */ const R = 5; const C1 = 6.5025; // (0.01 * 255)^2 const C2 = 58.5225; // (0.03 * 255)^2 let ssimSum = 0; let windowCount = 0; for (let y = R; y < height - R; y++) { for (let x = R; x < width - R; x++) { const x1 = x - R, x2 = x + R + 1; const y1 = y - R, y2 = y + R + 1; const n = (2 * R + 1) * (2 * R + 1); const sA = rectSum(intA, x1, y1, x2, y2); const sA2 = rectSum(intA2, x1, y1, x2, y2); const sB = rectSum(intB, x1, y1, x2, y2); const sB2 = rectSum(intB2, x1, y1, x2, y2); const sAB = rectSum(intAB, x1, y1, x2, y2); const muA = sA / n; const muB = sB / n; const sigmaA2 = sA2 / n - muA * muA; const sigmaB2 = sB2 / n - muB * muB; const sigmaAB = sAB / n - muA * muB; const num = (2 * muA * muB + C1) * (2 * sigmaAB + C2); const den = (muA * muA + muB * muB + C1) * (sigmaA2 + sigmaB2 + C2); ssimSum += num / den; windowCount++; } } return windowCount > 0 ? ssimSum / windowCount : 0; } // ======== 测试配置 ======== const testCases = [ /** TTF 字体 */ { label: "8个汉字", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "天地玄黄宇宙洪荒", sourceType: "ttf" as const, outType: "ttf" as const, fullFormat: "truetype" }, { label: "8个汉字", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "天地玄黄宇宙洪荒", sourceType: "ttf" as const, outType: "woff2" as const, fullFormat: "truetype" }, { label: "拉丁+数字", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "Hello World 123", sourceType: "ttf" as const, outType: "ttf" as const, fullFormat: "truetype" }, { label: "拉丁+数字", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "Hello World 123", sourceType: "ttf" as const, outType: "woff2" as const, fullFormat: "truetype" }, { label: "千字文前段", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "天地玄黄宇宙洪荒日月盈昃辰宿列张寒来暑往秋收冬藏闰余成岁律吕调阳云腾致雨露结为霜金生丽水玉出昆冈剑号巨阙珠称夜光果珍李柰菜重芥姜海咸河淡鳞潜羽翔", sourceType: "ttf" as const, outType: "ttf" as const, fullFormat: "truetype" }, { label: "千字文前段", fontPath: "font/令东齐伋复刻体.ttf", fontName: "令东齐伋复刻体", text: "天地玄黄宇宙洪荒日月盈昃辰宿列张寒来暑往秋收冬藏闰余成岁律吕调阳云腾致雨露结为霜金生丽水玉出昆冈剑号巨阙珠称夜光果珍李柰菜重芥姜海咸河淡鳞潜羽翔", sourceType: "ttf" as const, outType: "woff2" as const, fullFormat: "truetype" }, /** OTF 字体 */ { label: "otf-五个汉字", fontPath: "font/temp/BaiHuOTFJiaoYuHanZi-2.otf", fontName: "白狐教育汉字", text: "天地黄宇宙", sourceType: "otf" as const, outType: "ttf" as const, fullFormat: "opentype" }, { label: "otf-思源黑体", fontPath: "font/temp/SourceHanSans-Regular.otf", fontName: "思源黑体", text: "天地玄黄宇宙", sourceType: "otf" as const, outType: "ttf" as const, fullFormat: "opentype" }, ]; // ======== 主测试 ======== await mkdir(`${BENCHMARK_DIR}/json`, { recursive: true }); await mkdir(`${BENCHMARK_DIR}/screenshots`, { recursive: true }); console.log("\n=== 字体裁剪基准测试 ===\n"); /** 预加载字体文件 */ const fontBuffers = new Map(); for (const tc of testCases) { if (!fontBuffers.has(tc.fontPath)) { const raw = await readFile(tc.fontPath); fontBuffers.set(tc.fontPath, new Uint8Array(raw).buffer); } } /** 注册完整字体到 HTTP 服务器 */ for (const tc of testCases) { const key = `full_${tc.sourceType}_${tc.label}.ttf`; const raw = await readFile(tc.fontPath); fontStore.set(key, Buffer.from(raw)); /** OTF 也注册 .otf 后缀 */ if (tc.sourceType === "otf") { fontStore.set(key.replace(".ttf", ".otf"), Buffer.from(raw)); } } /** 启动 HTTP 服务器和无头浏览器 */ const { server, port } = await createFontServer(); const baseUrl = `http://127.0.0.1:${port}`; const browser = await puppeteer.launch({ headless: true, args: ["--no-sandbox", "--disable-gpu", "--font-render-hinting=none"], }); const page = await browser.newPage(); page.setViewport({ width: 1200, height: 800 }); page.on("console", (msg) => console.log(` [browser] ${msg.text()}`)); page.on("pageerror", (err) => console.log(` [page-error] ${err.message}`)); console.log(` HTTP 服务器: ${baseUrl}`); console.log(` 无头浏览器: 已启动\n`); const results: Array<{ label: string; sourceType: string; outType: string; avg: number; min: number; max: number; outputSize: number; ssim: number; fullInk: number; subsetInk: number; }> = []; for (const tc of testCases) { const buf = fontBuffers.get(tc.fontPath)!; /** --- 子集化测试（调用 API 的 fontSubset） --- */ const times: number[] = []; let lastSize = 0; let lastBuffer: Uint8Array | null = null; for (let i = 0; i < ROUNDS; i++) { const t0 = performance.now(); const subsetBuf = await fontSubset(buf, tc.text, { sourceType: tc.sourceType, outType: tc.outType }); const t1 = performance.now(); times.push(t1 - t0); lastSize = subsetBuf.byteLength; if (i === 0) lastBuffer = subsetBuf; } const avg = times.reduce((a, b) => a + b, 0) / times.length; const min = Math.min(...times); const max = Math.max(...times); /** --- 渲染对比 --- */ let ssim = 0; let fullInk = 0; let subsetInk = 0; if (lastBuffer) { const safeLabel = tc.label.replace(/[^a-zA-Z0-9\u4e00-\u9fff]/g, "_"); /** * 验证子集字体的 maxp 表中 maxPoints/maxContours 不为 0 * 这两个值为 0 会导致浏览器跳过渲染（字体加载成功但文字显示空白/fallback） * 之前 OTF→TTF 转换因 optimizettf 中 _flatContours 路径遗漏统计而触发此问题 */ if (tc.outType !== "woff2") { const ttfView = new DataView(lastBuffer.buffer, lastBuffer.byteOffset, lastBuffer.byteLength); const numTbl = ttfView.getUint16(4, false); for (let ti = 0; ti < numTbl; ti++) { const toff = 12 + ti * 16; const tag = String.fromCharCode(ttfView.getUint8(toff), ttfView.getUint8(toff + 1), ttfView.getUint8(toff + 2), ttfView.getUint8(toff + 3)); if (tag === "maxp") { const moff = ttfView.getUint32(toff + 8, false); const maxPoints = ttfView.getUint16(moff + 6, false); const maxContours = ttfView.getUint16(moff + 8, false); if (maxPoints === 0 || maxContours === 0) { throw new Error(`子集字体 maxp 异常: maxPoints=${maxPoints} maxContours=${maxContours}（浏览器将跳过渲染）`); } break; } } } /** 注册子集字体 */ const subsetKey = `subset_${safeLabel}.${tc.outType}`; fontStore.set(subsetKey, Buffer.from(lastBuffer)); /** 完整字体 key */ const fullKey = tc.sourceType === "otf" ? `full_otf_${tc.label}.otf` : `full_ttf_${tc.label}.ttf`; /** 渲染完整字体 */ const fullResult = await renderTextViaBrowser(page, baseUrl, fullKey, tc.text, 48, tc.fullFormat); /** 渲染子集字体 */ const subsetResult = await renderTextViaBrowser(page, baseUrl, subsetKey, tc.text, 48, "truetype"); await writeFile(`${BENCHMARK_DIR}/screenshots/${safeLabel}_full.png`, fullResult.screenshot); await writeFile(`${BENCHMARK_DIR}/screenshots/${safeLabel}_subset.png`, subsetResult.screenshot); fullInk = fullResult.inkPixels; subsetInk = subsetResult.inkPixels; ssim = calculateSSIM(fullResult.pixels, subsetResult.pixels); } results.push({ label: tc.label, sourceType: tc.sourceType, outType: tc.outType, avg, min, max, outputSize: lastSize, ssim, fullInk, subsetInk }); const tag = tc.sourceType === "otf" ? "otf→ttf" : tc.outType; console.log(` [${tag}] ${tc.label}: avg=${avg.toFixed(1)}ms min=${min.toFixed(1)}ms max=${max.toFixed(1)}ms 输出=${lastSize.toLocaleString()} bytes ssim=${ssim.toFixed(4)} ink=${fullInk}/${subsetInk}`); } /** 清理 */ await browser.close(); server.close(); /** 保存结果到 JSON */ const timestamp = new Date().toISOString().replace(/[:.]/g, "-"); const resultFile = `${BENCHMARK_DIR}/json/benchmark_${timestamp}.json`; await writeFile(resultFile, JSON.stringify({ timestamp: new Date().toISOString(), rounds: ROUNDS, results }, null, 2)); console.log(`\n结果已保存到 ${resultFile}`); console.log(`渲染对比图片已保存到 ${BENCHMARK_DIR}/screenshots/ 目录\n`);