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참고/playwright-main/packages/isomorphic/imageUtils.ts

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+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type ImageData = { width: number, height: number, data: Buffer };
+
+export function padImageToSize(image: ImageData, size: { width: number, height: number }): ImageData {
+  if (image.width === size.width && image.height === size.height)
+    return image;
+  const buffer = new Uint8Array(size.width * size.height * 4);
+  for (let y = 0; y < size.height; y++) {
+    for (let x = 0; x < size.width; x++) {
+      const to = (y * size.width + x) * 4;
+      if (y < image.height && x < image.width) {
+        const from = (y * image.width + x) * 4;
+        buffer[to] = image.data[from];
+        buffer[to + 1] = image.data[from + 1];
+        buffer[to + 2] = image.data[from + 2];
+        buffer[to + 3] = image.data[from + 3];
+      } else {
+        buffer[to] = 0;
+        buffer[to + 1] = 0;
+        buffer[to + 2] = 0;
+        buffer[to + 3] = 0;
+      }
+    }
+  }
+  return { data: Buffer.from(buffer), width: size.width, height: size.height };
+}
+
+export function scaleImageToSize(image: ImageData, size: { width: number; height: number }): ImageData {
+  const { data: src, width: w1, height: h1 } = image;
+  const w2 = Math.max(1, Math.floor(size.width));
+  const h2 = Math.max(1, Math.floor(size.height));
+
+  if (w1 === w2 && h1 === h2)
+    return image;
+
+  if (w1 <= 0 || h1 <= 0)
+    throw new Error('Invalid input image');
+  if (size.width <= 0 || size.height <= 0 || !isFinite(size.width) || !isFinite(size.height))
+    throw new Error('Invalid output dimensions');
+
+  const clamp = (v: number, lo: number, hi: number) => (v < lo ? lo : v > hi ? hi : v);
+
+  // Catmull–Rom weights
+  const weights = (t: number, o: Float32Array) => {
+    const t2 = t * t;
+    const t3 = t2 * t;
+    o[0] = -0.5 * t + 1.0 * t2 - 0.5 * t3;
+    o[1] = 1.0 - 2.5 * t2 + 1.5 * t3;
+    o[2] = 0.5 * t + 2.0 * t2 - 1.5 * t3;
+    o[3] = -0.5 * t2 + 0.5 * t3;
+  };
+
+  const srcRowStride = w1 * 4;
+  const dstRowStride = w2 * 4;
+
+  // Precompute X: indices, weights, and byte offsets (idx*4)
+  const xOff = new Int32Array(w2 * 4); // byte offsets = xIdx*4
+  const xW = new Float32Array(w2 * 4);
+  const wx = new Float32Array(4);
+  const xScale = w1 / w2;
+  for (let x = 0; x < w2; x++) {
+    const sx = (x + 0.5) * xScale - 0.5;
+    const sxi = Math.floor(sx);
+    const t = sx - sxi;
+    weights(t, wx);
+    const b = x * 4;
+    const i0 = clamp(sxi - 1, 0, w1 - 1);
+    const i1 = clamp(sxi + 0, 0, w1 - 1);
+    const i2 = clamp(sxi + 1, 0, w1 - 1);
+    const i3 = clamp(sxi + 2, 0, w1 - 1);
+    xOff[b + 0] = i0 << 2; xOff[b + 1] = i1 << 2; xOff[b + 2] = i2 << 2; xOff[b + 3] = i3 << 2;
+    xW[b + 0] = wx[0]; xW[b + 1] = wx[1]; xW[b + 2] = wx[2]; xW[b + 3] = wx[3];
+  }
+
+  // Precompute Y: indices, weights, and row-base byte offsets (y*rowStride)
+  const yRow = new Int32Array(h2 * 4); // row base in bytes
+  const yW = new Float32Array(h2 * 4);
+  const wy = new Float32Array(4);
+  const yScale = h1 / h2;
+  for (let y = 0; y < h2; y++) {
+    const sy = (y + 0.5) * yScale - 0.5;
+    const syi = Math.floor(sy);
+    const t = sy - syi;
+    weights(t, wy);
+    const b = y * 4;
+    const j0 = clamp(syi - 1, 0, h1 - 1);
+    const j1 = clamp(syi + 0, 0, h1 - 1);
+    const j2 = clamp(syi + 1, 0, h1 - 1);
+    const j3 = clamp(syi + 2, 0, h1 - 1);
+    yRow[b + 0] = j0 * srcRowStride;
+    yRow[b + 1] = j1 * srcRowStride;
+    yRow[b + 2] = j2 * srcRowStride;
+    yRow[b + 3] = j3 * srcRowStride;
+    yW[b + 0] = wy[0]; yW[b + 1] = wy[1]; yW[b + 2] = wy[2]; yW[b + 3] = wy[3];
+  }
+
+  const dst = new Uint8Array(w2 * h2 * 4);
+
+  for (let y = 0; y < h2; y++) {
+    const yb = y * 4;
+    const rb0 = yRow[yb + 0];
+    const rb1 = yRow[yb + 1];
+    const rb2 = yRow[yb + 2];
+    const rb3 = yRow[yb + 3];
+    const wy0 = yW[yb + 0];
+    const wy1 = yW[yb + 1];
+    const wy2 = yW[yb + 2];
+    const wy3 = yW[yb + 3];
+    const dstBase = y * dstRowStride;
+
+    for (let x = 0; x < w2; x++) {
+      const xb = x * 4;
+      const xo0 = xOff[xb + 0];
+      const xo1 = xOff[xb + 1];
+      const xo2 = xOff[xb + 2];
+      const xo3 = xOff[xb + 3];
+      const wx0 = xW[xb + 0];
+      const wx1 = xW[xb + 1];
+      const wx2 = xW[xb + 2];
+      const wx3 = xW[xb + 3];
+      const di = dstBase + (x << 2);
+
+      // unrolled RGBA
+      for (let c = 0; c < 4; c++) {
+        const r0 = src[rb0 + xo0 + c] * wx0 + src[rb0 + xo1 + c] * wx1 + src[rb0 + xo2 + c] * wx2 + src[rb0 + xo3 + c] * wx3;
+        const r1 = src[rb1 + xo0 + c] * wx0 + src[rb1 + xo1 + c] * wx1 + src[rb1 + xo2 + c] * wx2 + src[rb1 + xo3 + c] * wx3;
+        const r2 = src[rb2 + xo0 + c] * wx0 + src[rb2 + xo1 + c] * wx1 + src[rb2 + xo2 + c] * wx2 + src[rb2 + xo3 + c] * wx3;
+        const r3 = src[rb3 + xo0 + c] * wx0 + src[rb3 + xo1 + c] * wx1 + src[rb3 + xo2 + c] * wx2 + src[rb3 + xo3 + c] * wx3;
+        const v = r0 * wy0 + r1 * wy1 + r2 * wy2 + r3 * wy3;
+        dst[di + c] = v < 0 ? 0 : v > 255 ? 255 : v | 0;
+      }
+    }
+  }
+
+  return { data: Buffer.from(dst.buffer), width: w2, height: h2 };
+}