62 lines
1.9 KiB
TypeScript
62 lines
1.9 KiB
TypeScript
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/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the 'License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { blendWithWhite } from './colorUtils';
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export class ImageChannel {
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data: Uint8Array;
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width: number;
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height: number;
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static intoRGB(width: number, height: number, data: Buffer): ImageChannel[] {
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const r = new Uint8Array(width * height);
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const g = new Uint8Array(width * height);
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const b = new Uint8Array(width * height);
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for (let y = 0; y < height; ++y) {
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for (let x = 0; x < width; ++x) {
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const index = y * width + x;
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const offset = index * 4;
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const alpha = data[offset + 3] === 255 ? 1 : data[offset + 3] / 255;
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r[index] = blendWithWhite(data[offset], alpha);
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g[index] = blendWithWhite(data[offset + 1], alpha);
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b[index] = blendWithWhite(data[offset + 2], alpha);
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}
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}
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return [
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new ImageChannel(width, height, r),
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new ImageChannel(width, height, g),
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new ImageChannel(width, height, b),
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];
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}
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constructor(width: number, height: number, data: Uint8Array) {
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this.data = data;
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this.width = width;
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this.height = height;
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}
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get(x: number, y: number) {
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return this.data[y * this.width + x];
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}
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boundXY(x: number, y: number) {
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return [
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Math.min(Math.max(x, 0), this.width - 1),
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Math.min(Math.max(y, 0), this.height - 1),
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];
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}
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}
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