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