참고소스 수정본

참고/playwright-main/packages/utils/image_tools/imageChannel.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.
+ */
+
+import { blendWithWhite } from './colorUtils';
+
+export type PaddingOptions = {
+  paddingSize?: number,
+  paddingColorOdd?: number[],
+  paddingColorEven?: number[],
+};
+
+export class ImageChannel {
+  data: Uint8Array;
+  width: number;
+  height: number;
+
+  static intoRGB(width: number, height: number, data: Buffer, options: PaddingOptions = {}): ImageChannel[] {
+    const {
+      paddingSize = 0,
+      paddingColorOdd = [255, 0, 255],
+      paddingColorEven = [0, 255, 0],
+    } = options;
+    const newWidth = width + 2 * paddingSize;
+    const newHeight = height + 2 * paddingSize;
+    const r = new Uint8Array(newWidth * newHeight);
+    const g = new Uint8Array(newWidth * newHeight);
+    const b = new Uint8Array(newWidth * newHeight);
+    for (let y = 0; y < newHeight; ++y) {
+      for (let x = 0; x < newWidth; ++x) {
+        const index = y * newWidth + x;
+        if (y >= paddingSize && y < newHeight - paddingSize && x >= paddingSize && x < newWidth - paddingSize) {
+          const offset = ((y - paddingSize) * width + (x - paddingSize)) * 4;
+          const alpha = data[offset + 3] === 255 ? 1 : data[offset + 3] / 255;
+          r[index] = blendWithWhite(data[offset], alpha);
+          g[index] = blendWithWhite(data[offset + 1], alpha);
+          b[index] = blendWithWhite(data[offset + 2], alpha);
+        } else {
+          const color = (y + x) % 2 === 0 ? paddingColorEven : paddingColorOdd;
+          r[index] = color[0];
+          g[index] = color[1];
+          b[index] = color[2];
+        }
+      }
+    }
+    return [
+      new ImageChannel(newWidth, newHeight, r),
+      new ImageChannel(newWidth, newHeight, g),
+      new ImageChannel(newWidth, newHeight, b),
+    ];
+  }
+
+  constructor(width: number, height: number, data: Uint8Array) {
+    this.data = data;
+    this.width = width;
+    this.height = height;
+  }
+
+  get(x: number, y: number) {
+    return this.data[y * this.width + x];
+  }
+
+  boundXY(x: number, y: number) {
+    return [
+      Math.min(Math.max(x, 0), this.width - 1),
+      Math.min(Math.max(y, 0), this.height - 1),
+    ];
+  }
+}