@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
76 lines (75 loc) • 2.58 kB
JavaScript
/*
* 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());
}
}