mirror of
https://github.com/GoogleChromeLabs/squoosh.git
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38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
/**
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* Copyright 2020 Google Inc. All Rights Reserved.
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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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* http://www.apache.org/licenses/LICENSE-2.0
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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 { Options } from '../shared/meta';
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export default async function crop(
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{ data, width, height }: ImageData,
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{ top, right, bottom, left }: Options,
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): Promise<ImageData> {
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const newWidth = width - left - right;
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const newHeight = height - top - bottom;
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const cols = width * 4;
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const newCols = newWidth * 4;
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const pixels = new Uint8ClampedArray(newHeight * newCols);
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for (let y = 0; y < newHeight; y++) {
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const x = left * 4;
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const row = new Uint8ClampedArray(
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data.buffer,
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(top + y) * cols + x,
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newCols,
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);
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pixels.set(row, y * newCols);
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}
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return new ImageData(pixels, newWidth, newHeight);
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}
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