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699 lines
18 KiB
699 lines
18 KiB
/* 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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const mulTable = [
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512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292,
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512, 454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292,
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273, 512, 482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259,
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496, 475, 456, 437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292,
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282, 273, 265, 512, 497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373,
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364, 354, 345, 337, 328, 320, 312, 305, 298, 291, 284, 278, 271, 265, 259,
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507, 496, 485, 475, 465, 456, 446, 437, 428, 420, 412, 404, 396, 388, 381,
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374, 367, 360, 354, 347, 341, 335, 329, 323, 318, 312, 307, 302, 297, 292,
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287, 282, 278, 273, 269, 265, 261, 512, 505, 497, 489, 482, 475, 468, 461,
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454, 447, 441, 435, 428, 422, 417, 411, 405, 399, 394, 389, 383, 378, 373,
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368, 364, 359, 354, 350, 345, 341, 337, 332, 328, 324, 320, 316, 312, 309,
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305, 301, 298, 294, 291, 287, 284, 281, 278, 274, 271, 268, 265, 262, 259,
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257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456, 451, 446, 442,
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437, 433, 428, 424, 420, 416, 412, 408, 404, 400, 396, 392, 388, 385, 381,
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377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335, 332,
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329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297, 294, 292,
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289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259
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];
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const shgTable = [
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9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
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17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
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19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
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20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
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21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
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23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24
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];
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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 (
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img, canvas, radius, blurAlphaChannel, useOffset, skipStyles
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) {
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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 || !('naturalWidth' in img)) {
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return;
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}
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const dimensionType = useOffset ? 'offset' : 'natural';
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const w = img[dimensionType + 'Width'];
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const h = img[dimensionType + '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 || !('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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const 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) { return; }
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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(
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'Expecting canvas with `getContext` method ' +
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'in processCanvasRGB(A) calls!'
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);
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}
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const 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) { return; }
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radius |= 0;
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let imageData = getImageDataFromCanvas(canvas, topX, topY, width, height);
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imageData = processImageDataRGBA(
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imageData, topX, topY, width, height, radius
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);
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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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const pixels = imageData.data;
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const div = 2 * radius + 1;
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// const w4 = width << 2;
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const widthMinus1 = width - 1;
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const heightMinus1 = height - 1;
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const radiusPlus1 = radius + 1;
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const sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;
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const stackStart = new BlurStack();
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let stack = stackStart;
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let stackEnd;
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for (let 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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let stackIn = null,
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stackOut = null,
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yw = 0,
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yi = 0;
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const mulSum = mulTable[radius];
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const shgSum = shgTable[radius];
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for (let y = 0; y < height; y++) {
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stack = stackStart;
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const 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 (let 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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let rInSum = 0, gInSum = 0, bInSum = 0, 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 (let i = 1; i < radiusPlus1; i++) {
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const p = yi + ((widthMinus1 < i ? widthMinus1 : i) << 2);
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const 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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const rbs = radiusPlus1 - i;
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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 (let x = 0; x < width; x++) {
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const paInitial = (aSum * mulSum) >> shgSum;
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pixels[yi + 3] = paInitial;
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if (paInitial !== 0) {
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const a = 255 / paInitial;
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pixels[yi] = ((rSum * mulSum) >> shgSum) * a;
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pixels[yi + 1] = ((gSum * mulSum) >> shgSum) * a;
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pixels[yi + 2] = ((bSum * mulSum) >> shgSum) * a;
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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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let p = x + radius + 1;
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p = (yw + (p < widthMinus1
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? p
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: 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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const {r, g, b, a} = stackOut;
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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 (let x = 0; x < width; x++) {
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yi = x << 2;
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let 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 (let 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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let yp = width;
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let gInSum = 0, bInSum = 0, aInSum = 0, rInSum = 0;
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for (let i = 1; i <= radius; i++) {
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yi = (yp + x) << 2;
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const rbs = radiusPlus1 - i;
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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 (i < 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 (let y = 0; y < height; y++) {
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let p = yi << 2;
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pixels[p + 3] = pa = (aSum * mulSum) >> shgSum;
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if (pa > 0) {
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pa = 255 / pa;
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pixels[p] = ((rSum * mulSum) >> shgSum) * pa;
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pixels[p + 1] = ((gSum * mulSum) >> shgSum) * pa;
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pixels[p + 2] = ((bSum * mulSum) >> shgSum) * pa;
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} else {
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pixels[p] = pixels[p + 1] = pixels[p + 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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p = (x + (
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((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) *
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width
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)) << 2;
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rSum += (rInSum += (stackIn.r = pixels[p]));
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gSum += (gInSum += (stackIn.g = pixels[p + 1]));
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bSum += (bInSum += (stackIn.b = pixels[p + 2]));
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aSum += (aInSum += (stackIn.a = pixels[p + 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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/**
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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) { return; }
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radius |= 0;
|
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let imageData = getImageDataFromCanvas(canvas, topX, topY, width, height);
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imageData = processImageDataRGB(
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imageData, topX, topY, width, height, radius
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);
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canvas.getContext('2d').putImageData(imageData, topX, topY);
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}
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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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*/
|
|
function processImageDataRGB (imageData, topX, topY, width, height, radius) {
|
|
const pixels = imageData.data;
|
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|
|
const div = 2 * radius + 1;
|
|
// const w4 = width << 2;
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const widthMinus1 = width - 1;
|
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const heightMinus1 = height - 1;
|
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const radiusPlus1 = radius + 1;
|
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const sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;
|
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|
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const stackStart = new BlurStack();
|
|
let stack = stackStart;
|
|
let stackEnd;
|
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for (let i = 1; i < div; i++) {
|
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stack = stack.next = new BlurStack();
|
|
if (i === radiusPlus1) {
|
|
stackEnd = stack;
|
|
}
|
|
}
|
|
stack.next = stackStart;
|
|
let stackIn = null;
|
|
let stackOut = null;
|
|
|
|
const mulSum = mulTable[radius];
|
|
const shgSum = shgTable[radius];
|
|
|
|
let p, rbs;
|
|
let yw = 0, yi = 0;
|
|
|
|
for (let y = 0; y < height; y++) {
|
|
let pr = pixels[yi],
|
|
pg = pixels[yi + 1],
|
|
pb = pixels[yi + 2],
|
|
rOutSum = radiusPlus1 * pr,
|
|
gOutSum = radiusPlus1 * pg,
|
|
bOutSum = radiusPlus1 * pb,
|
|
rSum = sumFactor * pr,
|
|
gSum = sumFactor * pg,
|
|
bSum = sumFactor * pb;
|
|
|
|
stack = stackStart;
|
|
|
|
for (let i = 0; i < radiusPlus1; i++) {
|
|
stack.r = pr;
|
|
stack.g = pg;
|
|
stack.b = pb;
|
|
stack = stack.next;
|
|
}
|
|
|
|
let rInSum = 0, gInSum = 0, bInSum = 0;
|
|
for (let i = 1; i < radiusPlus1; i++) {
|
|
p = yi + ((widthMinus1 < i ? widthMinus1 : i) << 2);
|
|
rSum += (stack.r = (pr = pixels[p])) * (rbs = radiusPlus1 - i);
|
|
gSum += (stack.g = (pg = pixels[p + 1])) * rbs;
|
|
bSum += (stack.b = (pb = pixels[p + 2])) * rbs;
|
|
|
|
rInSum += pr;
|
|
gInSum += pg;
|
|
bInSum += pb;
|
|
|
|
stack = stack.next;
|
|
}
|
|
|
|
stackIn = stackStart;
|
|
stackOut = stackEnd;
|
|
for (let x = 0; x < width; x++) {
|
|
pixels[yi] = (rSum * mulSum) >> shgSum;
|
|
pixels[yi + 1] = (gSum * mulSum) >> shgSum;
|
|
pixels[yi + 2] = (bSum * mulSum) >> shgSum;
|
|
|
|
rSum -= rOutSum;
|
|
gSum -= gOutSum;
|
|
bSum -= bOutSum;
|
|
|
|
rOutSum -= stackIn.r;
|
|
gOutSum -= stackIn.g;
|
|
bOutSum -= stackIn.b;
|
|
|
|
p = (yw + (
|
|
(p = x + radius + 1) < widthMinus1 ? p : widthMinus1
|
|
)) << 2;
|
|
|
|
rInSum += (stackIn.r = pixels[p]);
|
|
gInSum += (stackIn.g = pixels[p + 1]);
|
|
bInSum += (stackIn.b = pixels[p + 2]);
|
|
|
|
rSum += rInSum;
|
|
gSum += gInSum;
|
|
bSum += bInSum;
|
|
|
|
stackIn = stackIn.next;
|
|
|
|
rOutSum += (pr = stackOut.r);
|
|
gOutSum += (pg = stackOut.g);
|
|
bOutSum += (pb = stackOut.b);
|
|
|
|
rInSum -= pr;
|
|
gInSum -= pg;
|
|
bInSum -= pb;
|
|
|
|
stackOut = stackOut.next;
|
|
|
|
yi += 4;
|
|
}
|
|
yw += width;
|
|
}
|
|
|
|
for (let x = 0; x < width; x++) {
|
|
yi = x << 2;
|
|
let pr = pixels[yi],
|
|
pg = pixels[yi + 1],
|
|
pb = pixels[yi + 2],
|
|
rOutSum = radiusPlus1 * pr,
|
|
gOutSum = radiusPlus1 * pg,
|
|
bOutSum = radiusPlus1 * pb,
|
|
rSum = sumFactor * pr,
|
|
gSum = sumFactor * pg,
|
|
bSum = sumFactor * pb;
|
|
|
|
stack = stackStart;
|
|
|
|
for (let i = 0; i < radiusPlus1; i++) {
|
|
stack.r = pr;
|
|
stack.g = pg;
|
|
stack.b = pb;
|
|
stack = stack.next;
|
|
}
|
|
|
|
let rInSum = 0, gInSum = 0, bInSum = 0;
|
|
for (let i = 1, yp = width; i <= radius; i++) {
|
|
yi = (yp + x) << 2;
|
|
|
|
rSum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i);
|
|
gSum += (stack.g = (pg = pixels[yi + 1])) * rbs;
|
|
bSum += (stack.b = (pb = pixels[yi + 2])) * rbs;
|
|
|
|
rInSum += pr;
|
|
gInSum += pg;
|
|
bInSum += pb;
|
|
|
|
stack = stack.next;
|
|
|
|
if (i < heightMinus1) {
|
|
yp += width;
|
|
}
|
|
}
|
|
|
|
yi = x;
|
|
stackIn = stackStart;
|
|
stackOut = stackEnd;
|
|
for (let y = 0; y < height; y++) {
|
|
p = yi << 2;
|
|
pixels[p] = (rSum * mulSum) >> shgSum;
|
|
pixels[p + 1] = (gSum * mulSum) >> shgSum;
|
|
pixels[p + 2] = (bSum * mulSum) >> shgSum;
|
|
|
|
rSum -= rOutSum;
|
|
gSum -= gOutSum;
|
|
bSum -= bOutSum;
|
|
|
|
rOutSum -= stackIn.r;
|
|
gOutSum -= stackIn.g;
|
|
bOutSum -= stackIn.b;
|
|
|
|
p = (x + (
|
|
((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) *
|
|
width
|
|
)) << 2;
|
|
|
|
rSum += (rInSum += (stackIn.r = pixels[p]));
|
|
gSum += (gInSum += (stackIn.g = pixels[p + 1]));
|
|
bSum += (bInSum += (stackIn.b = pixels[p + 2]));
|
|
|
|
stackIn = stackIn.next;
|
|
|
|
rOutSum += (pr = stackOut.r);
|
|
gOutSum += (pg = stackOut.g);
|
|
bOutSum += (pb = stackOut.b);
|
|
|
|
rInSum -= pr;
|
|
gInSum -= pg;
|
|
bInSum -= pb;
|
|
|
|
stackOut = stackOut.next;
|
|
|
|
yi += width;
|
|
}
|
|
}
|
|
|
|
return imageData;
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
export class BlurStack {
|
|
/**
|
|
* Set properties.
|
|
*/
|
|
constructor () {
|
|
this.r = 0;
|
|
this.g = 0;
|
|
this.b = 0;
|
|
this.a = 0;
|
|
this.next = null;
|
|
}
|
|
}
|
|
|
|
export {
|
|
/**
|
|
* @function module:StackBlur.image
|
|
* @see module:StackBlur~processImage
|
|
*/
|
|
processImage as image,
|
|
/**
|
|
* @function module:StackBlur.canvasRGBA
|
|
* @see module:StackBlur~processCanvasRGBA
|
|
*/
|
|
processCanvasRGBA as canvasRGBA,
|
|
/**
|
|
* @function module:StackBlur.canvasRGB
|
|
* @see module:StackBlur~processCanvasRGB
|
|
*/
|
|
processCanvasRGB as canvasRGB,
|
|
/**
|
|
* @function module:StackBlur.imageDataRGBA
|
|
* @see module:StackBlur~processImageDataRGBA
|
|
*/
|
|
processImageDataRGBA as imageDataRGBA,
|
|
/**
|
|
* @function module:StackBlur.imageDataRGB
|
|
* @see module:StackBlur~processImageDataRGB
|
|
*/
|
|
processImageDataRGB as imageDataRGB
|
|
};
|