/**
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* StackBlur - a fast almost Gaussian Blur For Canvas
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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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Or support me on flattr:
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https://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript
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* @module StackBlur
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* @version 0.5
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* @author Mario Klingemann
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Contact: mario@quasimondo.com
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Website: http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
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Twitter: @quasimondo
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* @copyright (c) 2010 Mario Klingemann
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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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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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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, 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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const 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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* @returns {undefined}
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*/
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function processImage (img, canvas, radius, blurAlphaChannel) {
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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 w = img.naturalWidth;
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const h = img.naturalHeight;
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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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canvas.style.width = w + 'px';
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canvas.style.height = h + 'px';
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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);
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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}
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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 || !('getContext' in canvas)) {
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return;
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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(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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const pixels = imageData.data;
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let x, y, i, p, yp, yi, yw, rSum, gSum, bSum, aSum,
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rOutSum, gOutSum, bOutSum, aOutSum,
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rInSum, gInSum, bInSum, aInSum,
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pr, pg, pb, pa, rbs;
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const div = radius + 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 (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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let stackOut = null;
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yw = yi = 0;
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const mulSum = mulTable[radius];
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const shgSum = shgTable[radius];
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for (y = 0; y < height; y++) {
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rInSum = gInSum = bInSum = aInSum = rSum = gSum = bSum = aSum = 0;
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rOutSum = radiusPlus1 * (pr = pixels[yi]);
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gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
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bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
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aOutSum = radiusPlus1 * (pa = pixels[yi + 3]);
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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 (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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for (i = 1; i < radiusPlus1; i++) {
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p = yi + ((widthMinus1 < i ? widthMinus1 : i) << 2);
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rSum += (stack.r = (pr = pixels[p])) * (rbs = radiusPlus1 - i);
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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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aSum += (stack.a = (pa = pixels[p + 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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}
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stackIn = stackStart;
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stackOut = stackEnd;
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for (x = 0; x < width; x++) {
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pixels[yi + 3] = pa = (aSum * mulSum) >> shgSum;
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if (pa !== 0) {
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pa = 255 / pa;
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pixels[yi] = ((rSum * mulSum) >> shgSum) * pa;
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pixels[yi + 1] = ((gSum * mulSum) >> shgSum) * pa;
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pixels[yi + 2] = ((bSum * mulSum) >> shgSum) * pa;
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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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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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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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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 += 4;
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}
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yw += width;
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}
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for (x = 0; x < width; x++) {
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gInSum = bInSum = aInSum = rInSum = gSum = bSum = aSum = rSum = 0;
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|
yi = x << 2;
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rOutSum = radiusPlus1 * (pr = pixels[yi]);
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gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
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bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
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aOutSum = radiusPlus1 * (pa = pixels[yi + 3]);
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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;
|
|
stack = stackStart;
|
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for (i = 0; i < radiusPlus1; i++) {
|
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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|
yp = width;
|
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for (i = 1; i <= radius; i++) {
|
yi = (yp + x) << 2;
|
|
rSum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i);
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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;
|
|
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;
|
|
if (i < heightMinus1) {
|
yp += width;
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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 (y = 0; y < height; y++) {
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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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}
|
|
rSum -= rOutSum;
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gSum -= gOutSum;
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bSum -= bOutSum;
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aSum -= aOutSum;
|
|
rOutSum -= stackIn.r;
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gOutSum -= stackIn.g;
|
bOutSum -= stackIn.b;
|
aOutSum -= stackIn.a;
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p = (x + (((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) * width)) << 2;
|
|
rSum += (rInSum += (stackIn.r = pixels[p]));
|
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]));
|
|
stackIn = stackIn.next;
|
|
rOutSum += (pr = stackOut.r);
|
gOutSum += (pg = stackOut.g);
|
bOutSum += (pb = stackOut.b);
|
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
|
* @param {Integer} topY
|
* @param {Integer} width
|
* @param {Integer} height
|
* @param {Float} radius
|
* @returns {undefined}
|
*/
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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(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
|
* @param {Integer} topY
|
* @param {Integer} width
|
* @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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const pixels = imageData.data;
|
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let x, y, i, p, yp, yi, yw, rSum, gSum, bSum,
|
rOutSum, gOutSum, bOutSum,
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rInSum, gInSum, bInSum,
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pr, pg, pb, rbs;
|
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const div = radius + radius + 1;
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// const w4 = width << 2;
|
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;
|
|
const stackStart = new BlurStack();
|
let stack = stackStart;
|
let stackEnd;
|
for (i = 1; i < div; i++) {
|
stack = stack.next = new BlurStack();
|
if (i === radiusPlus1) {
|
stackEnd = stack;
|
}
|
}
|
stack.next = stackStart;
|
let stackIn = null;
|
let stackOut = null;
|
|
yw = yi = 0;
|
|
const mulSum = mulTable[radius];
|
const shgSum = shgTable[radius];
|
|
for (y = 0; y < height; y++) {
|
rInSum = gInSum = bInSum = rSum = gSum = bSum = 0;
|
|
rOutSum = radiusPlus1 * (pr = pixels[yi]);
|
gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
|
bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
|
|
rSum += sumFactor * pr;
|
gSum += sumFactor * pg;
|
bSum += sumFactor * pb;
|
|
stack = stackStart;
|
|
for (i = 0; i < radiusPlus1; i++) {
|
stack.r = pr;
|
stack.g = pg;
|
stack.b = pb;
|
stack = stack.next;
|
}
|
|
for (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 (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 (x = 0; x < width; x++) {
|
gInSum = bInSum = rInSum = gSum = bSum = rSum = 0;
|
|
yi = x << 2;
|
rOutSum = radiusPlus1 * (pr = pixels[yi]);
|
gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
|
bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
|
|
rSum += sumFactor * pr;
|
gSum += sumFactor * pg;
|
bSum += sumFactor * pb;
|
|
stack = stackStart;
|
|
for (i = 0; i < radiusPlus1; i++) {
|
stack.r = pr;
|
stack.g = pg;
|
stack.b = pb;
|
stack = stack.next;
|
}
|
|
yp = width;
|
|
for (i = 1; 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 (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 {
|
constructor () {
|
this.r = 0;
|
this.g = 0;
|
this.b = 0;
|
this.a = 0;
|
this.next = null;
|
}
|
}
|
|
export {
|
/**
|
* @class module:StackBlur.image
|
* @see module:StackBlur~processImage
|
*/
|
processImage as image,
|
/**
|
* @class module:StackBlur.canvasRGBA
|
* @see module:StackBlur~processCanvasRGBA
|
*/
|
processCanvasRGBA as canvasRGBA,
|
/**
|
* @class module:StackBlur.canvasRGB
|
* @see module:StackBlur~processCanvasRGB
|
*/
|
processCanvasRGB as canvasRGB,
|
/**
|
* @class module:StackBlur.imageDataRGBA
|
* @see module:StackBlur~processImageDataRGBA
|
*/
|
processImageDataRGBA as imageDataRGBA,
|
/**
|
* @class module:StackBlur.imageDataRGB
|
* @see module:StackBlur~processImageDataRGB
|
*/
|
processImageDataRGB as imageDataRGB
|
};
|
