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639 lines
19 KiB
639 lines
19 KiB
function _typeof(obj) {
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"@babel/helpers - typeof";
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if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
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_typeof = function (obj) {
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return typeof obj;
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};
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} else {
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_typeof = function (obj) {
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return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
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};
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}
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return _typeof(obj);
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}
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function _classCallCheck(instance, Constructor) {
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if (!(instance instanceof Constructor)) {
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throw new TypeError("Cannot call a class as a function");
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}
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}
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/* eslint-disable no-bitwise -- used for calculations */
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/* eslint-disable unicorn/prefer-query-selector -- aiming at
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backward-compatibility */
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/**
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* StackBlur - a fast almost Gaussian Blur For Canvas
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*
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* In case you find this class useful - especially in commercial projects -
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* I am not totally unhappy for a small donation to my PayPal account
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* mario@quasimondo.de
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*
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* Or support me on flattr:
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* {@link https://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript}.
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*
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* @module StackBlur
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* @author Mario Klingemann
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* Contact: mario@quasimondo.com
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* Website: {@link http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html}
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* Twitter: @quasimondo
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*
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* @copyright (c) 2010 Mario Klingemann
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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var mulTable = [512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512, 454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292, 273, 512, 482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456, 437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292, 282, 273, 265, 512, 497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328, 320, 312, 305, 298, 291, 284, 278, 271, 265, 259, 507, 496, 485, 475, 465, 456, 446, 437, 428, 420, 412, 404, 396, 388, 381, 374, 367, 360, 354, 347, 341, 335, 329, 323, 318, 312, 307, 302, 297, 292, 287, 282, 278, 273, 269, 265, 261, 512, 505, 497, 489, 482, 475, 468, 461, 454, 447, 441, 435, 428, 422, 417, 411, 405, 399, 394, 389, 383, 378, 373, 368, 364, 359, 354, 350, 345, 341, 337, 332, 328, 324, 320, 316, 312, 309, 305, 301, 298, 294, 291, 287, 284, 281, 278, 274, 271, 268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456, 451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408, 404, 400, 396, 392, 388, 385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335, 332, 329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297, 294, 292, 289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259];
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var shgTable = [9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24];
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/**
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* @param {string|HTMLImageElement} img
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* @param {string|HTMLCanvasElement} canvas
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* @param {Float} radius
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* @param {boolean} blurAlphaChannel
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* @param {boolean} useOffset
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* @param {boolean} skipStyles
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* @returns {undefined}
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*/
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function processImage(img, canvas, radius, blurAlphaChannel, useOffset, skipStyles) {
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if (typeof img === 'string') {
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img = document.getElementById(img);
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}
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if (!img || Object.prototype.toString.call(img).slice(8, -1) === 'HTMLImageElement' && !('naturalWidth' in img)) {
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return;
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}
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var dimensionType = useOffset ? 'offset' : 'natural';
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var w = img[dimensionType + 'Width'];
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var h = img[dimensionType + 'Height']; // add ImageBitmap support,can blur texture source
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if (Object.prototype.toString.call(img).slice(8, -1) === 'ImageBitmap') {
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w = img.width;
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h = img.height;
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}
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if (typeof canvas === 'string') {
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canvas = document.getElementById(canvas);
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}
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if (!canvas || !('getContext' in canvas)) {
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return;
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}
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if (!skipStyles) {
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canvas.style.width = w + 'px';
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canvas.style.height = h + 'px';
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}
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canvas.width = w;
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canvas.height = h;
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var context = canvas.getContext('2d');
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context.clearRect(0, 0, w, h);
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context.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight, 0, 0, w, h);
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if (isNaN(radius) || radius < 1) {
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return;
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}
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if (blurAlphaChannel) {
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processCanvasRGBA(canvas, 0, 0, w, h, radius);
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} else {
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processCanvasRGB(canvas, 0, 0, w, h, radius);
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}
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}
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/**
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* @param {string|HTMLCanvasElement} canvas
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* @param {Integer} topX
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* @param {Integer} topY
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* @param {Integer} width
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* @param {Integer} height
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* @throws {Error|TypeError}
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* @returns {ImageData} See {@link https://html.spec.whatwg.org/multipage/canvas.html#imagedata}
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*/
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function getImageDataFromCanvas(canvas, topX, topY, width, height) {
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if (typeof canvas === 'string') {
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canvas = document.getElementById(canvas);
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}
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if (!canvas || _typeof(canvas) !== 'object' || !('getContext' in canvas)) {
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throw new TypeError('Expecting canvas with `getContext` method ' + 'in processCanvasRGB(A) calls!');
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}
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var context = canvas.getContext('2d');
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try {
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return context.getImageData(topX, topY, width, height);
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} catch (e) {
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throw new Error('unable to access image data: ' + e);
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}
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}
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/**
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* @param {HTMLCanvasElement} canvas
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* @param {Integer} topX
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* @param {Integer} topY
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* @param {Integer} width
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* @param {Integer} height
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* @param {Float} radius
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* @returns {undefined}
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*/
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function processCanvasRGBA(canvas, topX, topY, width, height, radius) {
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if (isNaN(radius) || radius < 1) {
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return;
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}
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radius |= 0;
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var imageData = getImageDataFromCanvas(canvas, topX, topY, width, height);
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imageData = processImageDataRGBA(imageData, topX, topY, width, height, radius);
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canvas.getContext('2d').putImageData(imageData, topX, topY);
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}
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/**
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* @param {ImageData} imageData
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* @param {Integer} topX
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* @param {Integer} topY
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* @param {Integer} width
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* @param {Integer} height
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* @param {Float} radius
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* @returns {ImageData}
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*/
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function processImageDataRGBA(imageData, topX, topY, width, height, radius) {
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var pixels = imageData.data;
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var div = 2 * radius + 1; // const w4 = width << 2;
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var widthMinus1 = width - 1;
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var heightMinus1 = height - 1;
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var radiusPlus1 = radius + 1;
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var sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;
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var stackStart = new BlurStack();
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var stack = stackStart;
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var stackEnd;
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for (var i = 1; i < div; i++) {
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stack = stack.next = new BlurStack();
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if (i === radiusPlus1) {
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stackEnd = stack;
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}
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}
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stack.next = stackStart;
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var stackIn = null,
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stackOut = null,
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yw = 0,
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yi = 0;
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var mulSum = mulTable[radius];
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var shgSum = shgTable[radius];
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for (var y = 0; y < height; y++) {
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stack = stackStart;
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var pr = pixels[yi],
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pg = pixels[yi + 1],
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pb = pixels[yi + 2],
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pa = pixels[yi + 3];
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for (var _i = 0; _i < radiusPlus1; _i++) {
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stack.r = pr;
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stack.g = pg;
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stack.b = pb;
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stack.a = pa;
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stack = stack.next;
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}
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var rInSum = 0,
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gInSum = 0,
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bInSum = 0,
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aInSum = 0,
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rOutSum = radiusPlus1 * pr,
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gOutSum = radiusPlus1 * pg,
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bOutSum = radiusPlus1 * pb,
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aOutSum = radiusPlus1 * pa,
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rSum = sumFactor * pr,
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gSum = sumFactor * pg,
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bSum = sumFactor * pb,
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aSum = sumFactor * pa;
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for (var _i2 = 1; _i2 < radiusPlus1; _i2++) {
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var p = yi + ((widthMinus1 < _i2 ? widthMinus1 : _i2) << 2);
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var r = pixels[p],
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g = pixels[p + 1],
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b = pixels[p + 2],
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a = pixels[p + 3];
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var rbs = radiusPlus1 - _i2;
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rSum += (stack.r = r) * rbs;
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gSum += (stack.g = g) * rbs;
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bSum += (stack.b = b) * rbs;
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aSum += (stack.a = a) * rbs;
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rInSum += r;
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gInSum += g;
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bInSum += b;
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aInSum += a;
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stack = stack.next;
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}
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stackIn = stackStart;
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stackOut = stackEnd;
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for (var x = 0; x < width; x++) {
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var paInitial = aSum * mulSum >>> shgSum;
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pixels[yi + 3] = paInitial;
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if (paInitial !== 0) {
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var _a2 = 255 / paInitial;
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pixels[yi] = (rSum * mulSum >>> shgSum) * _a2;
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pixels[yi + 1] = (gSum * mulSum >>> shgSum) * _a2;
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pixels[yi + 2] = (bSum * mulSum >>> shgSum) * _a2;
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} else {
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pixels[yi] = pixels[yi + 1] = pixels[yi + 2] = 0;
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}
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rSum -= rOutSum;
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gSum -= gOutSum;
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bSum -= bOutSum;
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aSum -= aOutSum;
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rOutSum -= stackIn.r;
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gOutSum -= stackIn.g;
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bOutSum -= stackIn.b;
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aOutSum -= stackIn.a;
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var _p = x + radius + 1;
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_p = yw + (_p < widthMinus1 ? _p : widthMinus1) << 2;
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rInSum += stackIn.r = pixels[_p];
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gInSum += stackIn.g = pixels[_p + 1];
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bInSum += stackIn.b = pixels[_p + 2];
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aInSum += stackIn.a = pixels[_p + 3];
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rSum += rInSum;
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gSum += gInSum;
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bSum += bInSum;
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aSum += aInSum;
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stackIn = stackIn.next;
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var _stackOut = stackOut,
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_r = _stackOut.r,
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_g = _stackOut.g,
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_b = _stackOut.b,
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_a = _stackOut.a;
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rOutSum += _r;
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gOutSum += _g;
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bOutSum += _b;
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aOutSum += _a;
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rInSum -= _r;
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gInSum -= _g;
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bInSum -= _b;
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aInSum -= _a;
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stackOut = stackOut.next;
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yi += 4;
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}
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yw += width;
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}
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for (var _x = 0; _x < width; _x++) {
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yi = _x << 2;
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var _pr = pixels[yi],
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_pg = pixels[yi + 1],
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_pb = pixels[yi + 2],
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_pa = pixels[yi + 3],
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_rOutSum = radiusPlus1 * _pr,
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_gOutSum = radiusPlus1 * _pg,
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_bOutSum = radiusPlus1 * _pb,
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_aOutSum = radiusPlus1 * _pa,
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_rSum = sumFactor * _pr,
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_gSum = sumFactor * _pg,
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_bSum = sumFactor * _pb,
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_aSum = sumFactor * _pa;
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stack = stackStart;
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for (var _i3 = 0; _i3 < radiusPlus1; _i3++) {
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stack.r = _pr;
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stack.g = _pg;
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stack.b = _pb;
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stack.a = _pa;
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stack = stack.next;
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}
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var yp = width;
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var _gInSum = 0,
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_bInSum = 0,
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_aInSum = 0,
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_rInSum = 0;
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for (var _i4 = 1; _i4 <= radius; _i4++) {
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yi = yp + _x << 2;
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var _rbs = radiusPlus1 - _i4;
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_rSum += (stack.r = _pr = pixels[yi]) * _rbs;
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_gSum += (stack.g = _pg = pixels[yi + 1]) * _rbs;
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_bSum += (stack.b = _pb = pixels[yi + 2]) * _rbs;
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_aSum += (stack.a = _pa = pixels[yi + 3]) * _rbs;
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_rInSum += _pr;
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_gInSum += _pg;
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_bInSum += _pb;
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_aInSum += _pa;
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stack = stack.next;
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if (_i4 < heightMinus1) {
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yp += width;
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}
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}
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yi = _x;
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stackIn = stackStart;
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stackOut = stackEnd;
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for (var _y = 0; _y < height; _y++) {
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var _p2 = yi << 2;
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pixels[_p2 + 3] = _pa = _aSum * mulSum >>> shgSum;
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if (_pa > 0) {
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_pa = 255 / _pa;
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pixels[_p2] = (_rSum * mulSum >>> shgSum) * _pa;
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pixels[_p2 + 1] = (_gSum * mulSum >>> shgSum) * _pa;
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pixels[_p2 + 2] = (_bSum * mulSum >>> shgSum) * _pa;
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} else {
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pixels[_p2] = pixels[_p2 + 1] = pixels[_p2 + 2] = 0;
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}
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_rSum -= _rOutSum;
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_gSum -= _gOutSum;
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_bSum -= _bOutSum;
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_aSum -= _aOutSum;
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_rOutSum -= stackIn.r;
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_gOutSum -= stackIn.g;
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_bOutSum -= stackIn.b;
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_aOutSum -= stackIn.a;
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_p2 = _x + ((_p2 = _y + radiusPlus1) < heightMinus1 ? _p2 : heightMinus1) * width << 2;
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_rSum += _rInSum += stackIn.r = pixels[_p2];
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_gSum += _gInSum += stackIn.g = pixels[_p2 + 1];
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_bSum += _bInSum += stackIn.b = pixels[_p2 + 2];
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_aSum += _aInSum += stackIn.a = pixels[_p2 + 3];
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stackIn = stackIn.next;
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_rOutSum += _pr = stackOut.r;
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_gOutSum += _pg = stackOut.g;
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_bOutSum += _pb = stackOut.b;
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_aOutSum += _pa = stackOut.a;
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_rInSum -= _pr;
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_gInSum -= _pg;
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_bInSum -= _pb;
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_aInSum -= _pa;
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stackOut = stackOut.next;
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yi += width;
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}
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}
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return imageData;
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}
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/**
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* @param {HTMLCanvasElement} canvas
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* @param {Integer} topX
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* @param {Integer} topY
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* @param {Integer} width
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* @param {Integer} height
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* @param {Float} radius
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* @returns {undefined}
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*/
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function processCanvasRGB(canvas, topX, topY, width, height, radius) {
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if (isNaN(radius) || radius < 1) {
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return;
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}
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radius |= 0;
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var imageData = getImageDataFromCanvas(canvas, topX, topY, width, height);
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imageData = processImageDataRGB(imageData, topX, topY, width, height, radius);
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canvas.getContext('2d').putImageData(imageData, topX, topY);
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}
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/**
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* @param {ImageData} imageData
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* @param {Integer} topX
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* @param {Integer} topY
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* @param {Integer} width
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* @param {Integer} height
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* @param {Float} radius
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* @returns {ImageData}
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*/
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function processImageDataRGB(imageData, topX, topY, width, height, radius) {
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var pixels = imageData.data;
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var div = 2 * radius + 1; // const w4 = width << 2;
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var widthMinus1 = width - 1;
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var heightMinus1 = height - 1;
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var radiusPlus1 = radius + 1;
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var sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;
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var stackStart = new BlurStack();
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var stack = stackStart;
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var stackEnd;
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for (var i = 1; i < div; i++) {
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stack = stack.next = new BlurStack();
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if (i === radiusPlus1) {
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stackEnd = stack;
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}
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}
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stack.next = stackStart;
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var stackIn = null;
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var stackOut = null;
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var mulSum = mulTable[radius];
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var shgSum = shgTable[radius];
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var p, rbs;
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var yw = 0,
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yi = 0;
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for (var y = 0; y < height; y++) {
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var pr = pixels[yi],
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pg = pixels[yi + 1],
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pb = pixels[yi + 2],
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rOutSum = radiusPlus1 * pr,
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gOutSum = radiusPlus1 * pg,
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bOutSum = radiusPlus1 * pb,
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rSum = sumFactor * pr,
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gSum = sumFactor * pg,
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bSum = sumFactor * pb;
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stack = stackStart;
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for (var _i5 = 0; _i5 < radiusPlus1; _i5++) {
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stack.r = pr;
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stack.g = pg;
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stack.b = pb;
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stack = stack.next;
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}
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var rInSum = 0,
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gInSum = 0,
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bInSum = 0;
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for (var _i6 = 1; _i6 < radiusPlus1; _i6++) {
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p = yi + ((widthMinus1 < _i6 ? widthMinus1 : _i6) << 2);
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rSum += (stack.r = pr = pixels[p]) * (rbs = radiusPlus1 - _i6);
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gSum += (stack.g = pg = pixels[p + 1]) * rbs;
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bSum += (stack.b = pb = pixels[p + 2]) * rbs;
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rInSum += pr;
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gInSum += pg;
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bInSum += pb;
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stack = stack.next;
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}
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stackIn = stackStart;
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stackOut = stackEnd;
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for (var x = 0; x < width; x++) {
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pixels[yi] = rSum * mulSum >>> shgSum;
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pixels[yi + 1] = gSum * mulSum >>> shgSum;
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pixels[yi + 2] = bSum * mulSum >>> shgSum;
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rSum -= rOutSum;
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gSum -= gOutSum;
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bSum -= bOutSum;
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rOutSum -= stackIn.r;
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gOutSum -= stackIn.g;
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bOutSum -= stackIn.b;
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p = yw + ((p = x + radius + 1) < widthMinus1 ? p : widthMinus1) << 2;
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rInSum += stackIn.r = pixels[p];
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gInSum += stackIn.g = pixels[p + 1];
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bInSum += stackIn.b = pixels[p + 2];
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rSum += rInSum;
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gSum += gInSum;
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bSum += bInSum;
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stackIn = stackIn.next;
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rOutSum += pr = stackOut.r;
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gOutSum += pg = stackOut.g;
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bOutSum += pb = stackOut.b;
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rInSum -= pr;
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gInSum -= pg;
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bInSum -= pb;
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stackOut = stackOut.next;
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yi += 4;
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}
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yw += width;
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}
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for (var _x2 = 0; _x2 < width; _x2++) {
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yi = _x2 << 2;
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var _pr2 = pixels[yi],
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_pg2 = pixels[yi + 1],
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_pb2 = pixels[yi + 2],
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_rOutSum2 = radiusPlus1 * _pr2,
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_gOutSum2 = radiusPlus1 * _pg2,
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_bOutSum2 = radiusPlus1 * _pb2,
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_rSum2 = sumFactor * _pr2,
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_gSum2 = sumFactor * _pg2,
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_bSum2 = sumFactor * _pb2;
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stack = stackStart;
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for (var _i7 = 0; _i7 < radiusPlus1; _i7++) {
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stack.r = _pr2;
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stack.g = _pg2;
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stack.b = _pb2;
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stack = stack.next;
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}
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var _rInSum2 = 0,
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_gInSum2 = 0,
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_bInSum2 = 0;
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for (var _i8 = 1, yp = width; _i8 <= radius; _i8++) {
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yi = yp + _x2 << 2;
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_rSum2 += (stack.r = _pr2 = pixels[yi]) * (rbs = radiusPlus1 - _i8);
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_gSum2 += (stack.g = _pg2 = pixels[yi + 1]) * rbs;
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_bSum2 += (stack.b = _pb2 = pixels[yi + 2]) * rbs;
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_rInSum2 += _pr2;
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_gInSum2 += _pg2;
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_bInSum2 += _pb2;
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stack = stack.next;
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if (_i8 < heightMinus1) {
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yp += width;
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}
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}
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yi = _x2;
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stackIn = stackStart;
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stackOut = stackEnd;
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for (var _y2 = 0; _y2 < height; _y2++) {
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p = yi << 2;
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pixels[p] = _rSum2 * mulSum >>> shgSum;
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pixels[p + 1] = _gSum2 * mulSum >>> shgSum;
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pixels[p + 2] = _bSum2 * mulSum >>> shgSum;
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_rSum2 -= _rOutSum2;
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_gSum2 -= _gOutSum2;
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_bSum2 -= _bOutSum2;
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_rOutSum2 -= stackIn.r;
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_gOutSum2 -= stackIn.g;
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_bOutSum2 -= stackIn.b;
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p = _x2 + ((p = _y2 + radiusPlus1) < heightMinus1 ? p : heightMinus1) * width << 2;
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_rSum2 += _rInSum2 += stackIn.r = pixels[p];
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_gSum2 += _gInSum2 += stackIn.g = pixels[p + 1];
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_bSum2 += _bInSum2 += stackIn.b = pixels[p + 2];
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stackIn = stackIn.next;
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_rOutSum2 += _pr2 = stackOut.r;
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_gOutSum2 += _pg2 = stackOut.g;
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_bOutSum2 += _pb2 = stackOut.b;
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_rInSum2 -= _pr2;
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_gInSum2 -= _pg2;
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_bInSum2 -= _pb2;
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stackOut = stackOut.next;
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yi += width;
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}
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}
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return imageData;
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}
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/**
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*
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*/
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var BlurStack =
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/**
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* Set properties.
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*/
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function BlurStack() {
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_classCallCheck(this, BlurStack);
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this.r = 0;
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this.g = 0;
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this.b = 0;
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this.a = 0;
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this.next = null;
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};
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export { BlurStack, processCanvasRGB as canvasRGB, processCanvasRGBA as canvasRGBA, processImage as image, processImageDataRGB as imageDataRGB, processImageDataRGBA as imageDataRGBA };
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