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@zxing/library

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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.

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/* * Copyright 2009 ZXing authors * * 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 LuminanceSource from './LuminanceSource'; /*namespace com.google.zxing {*/ /** * A wrapper implementation of {@link LuminanceSource} which inverts the luminances it returns -- black becomes * white and vice versa, and each value becomes (255-value). * * @author Sean Owen */ export default class InvertedLuminanceSource extends LuminanceSource { constructor(delegate) { super(delegate.getWidth(), delegate.getHeight()); this.delegate = delegate; } /*@Override*/ getRow(y /*int*/, row) { const sourceRow = this.delegate.getRow(y, row); const width = this.getWidth(); for (let i = 0; i < width; i++) { sourceRow[i] = /*(byte)*/ (255 - (sourceRow[i] & 0xFF)); } return sourceRow; } /*@Override*/ getMatrix() { const matrix = this.delegate.getMatrix(); const length = this.getWidth() * this.getHeight(); const invertedMatrix = new Uint8ClampedArray(length); for (let i = 0; i < length; i++) { invertedMatrix[i] = /*(byte)*/ (255 - (matrix[i] & 0xFF)); } return invertedMatrix; } /*@Override*/ isCropSupported() { return this.delegate.isCropSupported(); } /*@Override*/ crop(left /*int*/, top /*int*/, width /*int*/, height /*int*/) { return new InvertedLuminanceSource(this.delegate.crop(left, top, width, height)); } /*@Override*/ isRotateSupported() { return this.delegate.isRotateSupported(); } /** * @return original delegate {@link LuminanceSource} since invert undoes itself */ /*@Override*/ invert() { return this.delegate; } /*@Override*/ rotateCounterClockwise() { return new InvertedLuminanceSource(this.delegate.rotateCounterClockwise()); } /*@Override*/ rotateCounterClockwise45() { return new InvertedLuminanceSource(this.delegate.rotateCounterClockwise45()); } }