"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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};
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.HTMLCanvasElementLuminanceSource = void 0;
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var InvertedLuminanceSource_1 = require("../core/InvertedLuminanceSource");
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var LuminanceSource_1 = require("../core/LuminanceSource");
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var IllegalArgumentException_1 = require("../core/IllegalArgumentException");
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/**
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* @deprecated Moving to @zxing/browser
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*/
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var HTMLCanvasElementLuminanceSource = /** @class */ (function (_super) {
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__extends(HTMLCanvasElementLuminanceSource, _super);
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function HTMLCanvasElementLuminanceSource(canvas, doAutoInvert) {
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if (doAutoInvert === void 0) { doAutoInvert = false; }
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var _this = _super.call(this, canvas.width, canvas.height) || this;
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_this.canvas = canvas;
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_this.tempCanvasElement = null;
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_this.buffer = HTMLCanvasElementLuminanceSource.makeBufferFromCanvasImageData(canvas, doAutoInvert);
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return _this;
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}
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HTMLCanvasElementLuminanceSource.makeBufferFromCanvasImageData = function (canvas, doAutoInvert) {
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if (doAutoInvert === void 0) { doAutoInvert = false; }
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var imageData = canvas.getContext('2d').getImageData(0, 0, canvas.width, canvas.height);
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return HTMLCanvasElementLuminanceSource.toGrayscaleBuffer(imageData.data, canvas.width, canvas.height, doAutoInvert);
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};
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HTMLCanvasElementLuminanceSource.toGrayscaleBuffer = function (imageBuffer, width, height, doAutoInvert) {
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if (doAutoInvert === void 0) { doAutoInvert = false; }
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var grayscaleBuffer = new Uint8ClampedArray(width * height);
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HTMLCanvasElementLuminanceSource.FRAME_INDEX = !HTMLCanvasElementLuminanceSource.FRAME_INDEX;
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if (HTMLCanvasElementLuminanceSource.FRAME_INDEX || !doAutoInvert) {
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for (var i = 0, j = 0, length_1 = imageBuffer.length; i < length_1; i += 4, j++) {
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var gray = void 0;
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var alpha = imageBuffer[i + 3];
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// The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
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// black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
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// barcode image. Force any such pixel to be white:
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if (alpha === 0) {
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gray = 0xFF;
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}
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else {
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var pixelR = imageBuffer[i];
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var pixelG = imageBuffer[i + 1];
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var pixelB = imageBuffer[i + 2];
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// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
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// (306*R) >> 10 is approximately equal to R*0.299, and so on.
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// 0x200 >> 10 is 0.5, it implements rounding.
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gray = (306 * pixelR +
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601 * pixelG +
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117 * pixelB +
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0x200) >> 10;
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}
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grayscaleBuffer[j] = gray;
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}
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}
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else {
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for (var i = 0, j = 0, length_2 = imageBuffer.length; i < length_2; i += 4, j++) {
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var gray = void 0;
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var alpha = imageBuffer[i + 3];
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// The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
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// black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
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// barcode image. Force any such pixel to be white:
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if (alpha === 0) {
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gray = 0xFF;
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}
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else {
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var pixelR = imageBuffer[i];
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var pixelG = imageBuffer[i + 1];
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var pixelB = imageBuffer[i + 2];
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// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
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// (306*R) >> 10 is approximately equal to R*0.299, and so on.
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// 0x200 >> 10 is 0.5, it implements rounding.
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gray = (306 * pixelR +
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601 * pixelG +
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117 * pixelB +
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0x200) >> 10;
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}
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grayscaleBuffer[j] = 0xFF - gray;
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}
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}
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return grayscaleBuffer;
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};
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HTMLCanvasElementLuminanceSource.prototype.getRow = function (y /*int*/, row) {
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if (y < 0 || y >= this.getHeight()) {
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throw new IllegalArgumentException_1.default('Requested row is outside the image: ' + y);
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}
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var width = this.getWidth();
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var start = y * width;
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if (row === null) {
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row = this.buffer.slice(start, start + width);
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}
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else {
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if (row.length < width) {
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row = new Uint8ClampedArray(width);
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}
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// The underlying raster of image consists of bytes with the luminance values
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// TODO: can avoid set/slice?
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row.set(this.buffer.slice(start, start + width));
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}
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return row;
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};
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HTMLCanvasElementLuminanceSource.prototype.getMatrix = function () {
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return this.buffer;
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};
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HTMLCanvasElementLuminanceSource.prototype.isCropSupported = function () {
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return true;
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};
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HTMLCanvasElementLuminanceSource.prototype.crop = function (left /*int*/, top /*int*/, width /*int*/, height /*int*/) {
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_super.prototype.crop.call(this, left, top, width, height);
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return this;
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};
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/**
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* This is always true, since the image is a gray-scale image.
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*
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* @return true
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*/
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HTMLCanvasElementLuminanceSource.prototype.isRotateSupported = function () {
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return true;
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};
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HTMLCanvasElementLuminanceSource.prototype.rotateCounterClockwise = function () {
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this.rotate(-90);
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return this;
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};
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HTMLCanvasElementLuminanceSource.prototype.rotateCounterClockwise45 = function () {
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this.rotate(-45);
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return this;
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};
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HTMLCanvasElementLuminanceSource.prototype.getTempCanvasElement = function () {
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if (null === this.tempCanvasElement) {
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var tempCanvasElement = this.canvas.ownerDocument.createElement('canvas');
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tempCanvasElement.width = this.canvas.width;
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tempCanvasElement.height = this.canvas.height;
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this.tempCanvasElement = tempCanvasElement;
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}
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return this.tempCanvasElement;
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};
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HTMLCanvasElementLuminanceSource.prototype.rotate = function (angle) {
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var tempCanvasElement = this.getTempCanvasElement();
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var tempContext = tempCanvasElement.getContext('2d');
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var angleRadians = angle * HTMLCanvasElementLuminanceSource.DEGREE_TO_RADIANS;
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// Calculate and set new dimensions for temp canvas
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var width = this.canvas.width;
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var height = this.canvas.height;
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var newWidth = Math.ceil(Math.abs(Math.cos(angleRadians)) * width + Math.abs(Math.sin(angleRadians)) * height);
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var newHeight = Math.ceil(Math.abs(Math.sin(angleRadians)) * width + Math.abs(Math.cos(angleRadians)) * height);
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tempCanvasElement.width = newWidth;
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tempCanvasElement.height = newHeight;
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// Draw at center of temp canvas to prevent clipping of image data
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tempContext.translate(newWidth / 2, newHeight / 2);
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tempContext.rotate(angleRadians);
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tempContext.drawImage(this.canvas, width / -2, height / -2);
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this.buffer = HTMLCanvasElementLuminanceSource.makeBufferFromCanvasImageData(tempCanvasElement);
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return this;
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};
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HTMLCanvasElementLuminanceSource.prototype.invert = function () {
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return new InvertedLuminanceSource_1.default(this);
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};
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HTMLCanvasElementLuminanceSource.DEGREE_TO_RADIANS = Math.PI / 180;
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HTMLCanvasElementLuminanceSource.FRAME_INDEX = true;
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return HTMLCanvasElementLuminanceSource;
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}(LuminanceSource_1.default));
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exports.HTMLCanvasElementLuminanceSource = HTMLCanvasElementLuminanceSource;
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