/*
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* Copyright 2009 ZXing authors
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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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/*namespace com.google.zxing {*/
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import System from './util/System';
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import LuminanceSource from './LuminanceSource';
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import InvertedLuminanceSource from './InvertedLuminanceSource';
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import IllegalArgumentException from './IllegalArgumentException';
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/**
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* This object extends LuminanceSource around an array of YUV data returned from the camera driver,
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* with the option to crop to a rectangle within the full data. This can be used to exclude
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* superfluous pixels around the perimeter and speed up decoding.
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*
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* It works for any pixel format where the Y channel is planar and appears first, including
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* YCbCr_420_SP and YCbCr_422_SP.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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export default class PlanarYUVLuminanceSource extends LuminanceSource {
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constructor(yuvData, dataWidth /*int*/, dataHeight /*int*/, left /*int*/, top /*int*/, width /*int*/, height /*int*/, reverseHorizontal) {
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super(width, height);
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this.yuvData = yuvData;
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this.dataWidth = dataWidth;
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this.dataHeight = dataHeight;
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this.left = left;
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this.top = top;
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if (left + width > dataWidth || top + height > dataHeight) {
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throw new IllegalArgumentException('Crop rectangle does not fit within image data.');
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}
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if (reverseHorizontal) {
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this.reverseHorizontal(width, height);
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}
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}
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/*@Override*/
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getRow(y /*int*/, row) {
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if (y < 0 || y >= this.getHeight()) {
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throw new IllegalArgumentException('Requested row is outside the image: ' + y);
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}
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const width = this.getWidth();
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if (row === null || row === undefined || row.length < width) {
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row = new Uint8ClampedArray(width);
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}
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const offset = (y + this.top) * this.dataWidth + this.left;
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System.arraycopy(this.yuvData, offset, row, 0, width);
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return row;
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}
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/*@Override*/
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getMatrix() {
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const width = this.getWidth();
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const height = this.getHeight();
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// If the caller asks for the entire underlying image, save the copy and give them the
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// original data. The docs specifically warn that result.length must be ignored.
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if (width === this.dataWidth && height === this.dataHeight) {
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return this.yuvData;
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}
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const area = width * height;
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const matrix = new Uint8ClampedArray(area);
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let inputOffset = this.top * this.dataWidth + this.left;
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// If the width matches the full width of the underlying data, perform a single copy.
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if (width === this.dataWidth) {
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System.arraycopy(this.yuvData, inputOffset, matrix, 0, area);
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return matrix;
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}
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// Otherwise copy one cropped row at a time.
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for (let y = 0; y < height; y++) {
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const outputOffset = y * width;
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System.arraycopy(this.yuvData, inputOffset, matrix, outputOffset, width);
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inputOffset += this.dataWidth;
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}
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return matrix;
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}
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/*@Override*/
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isCropSupported() {
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return true;
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}
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/*@Override*/
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crop(left /*int*/, top /*int*/, width /*int*/, height /*int*/) {
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return new PlanarYUVLuminanceSource(this.yuvData, this.dataWidth, this.dataHeight, this.left + left, this.top + top, width, height, false);
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}
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renderThumbnail() {
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const width = this.getWidth() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
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const height = this.getHeight() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
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const pixels = new Int32Array(width * height);
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const yuv = this.yuvData;
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let inputOffset = this.top * this.dataWidth + this.left;
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for (let y = 0; y < height; y++) {
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const outputOffset = y * width;
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for (let x = 0; x < width; x++) {
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const grey = yuv[inputOffset + x * PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR] & 0xff;
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pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
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}
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inputOffset += this.dataWidth * PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
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}
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return pixels;
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}
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/**
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* @return width of image from {@link #renderThumbnail()}
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*/
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getThumbnailWidth() {
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return this.getWidth() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
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}
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/**
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* @return height of image from {@link #renderThumbnail()}
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*/
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getThumbnailHeight() {
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return this.getHeight() / PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR;
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}
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reverseHorizontal(width /*int*/, height /*int*/) {
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const yuvData = this.yuvData;
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for (let y = 0, rowStart = this.top * this.dataWidth + this.left; y < height; y++, rowStart += this.dataWidth) {
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const middle = rowStart + width / 2;
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for (let x1 = rowStart, x2 = rowStart + width - 1; x1 < middle; x1++, x2--) {
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const temp = yuvData[x1];
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yuvData[x1] = yuvData[x2];
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yuvData[x2] = temp;
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}
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}
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}
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invert() {
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return new InvertedLuminanceSource(this);
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}
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}
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PlanarYUVLuminanceSource.THUMBNAIL_SCALE_FACTOR = 2;
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