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blur.js
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blur.js
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(function ($) {
$.fn.blurjs = function (options) {
var canvas = document.createElement('canvas');
var isCached = false;
var selector = ($(this).selector).replace(/[^a-zA-Z0-9]/g, "");
if(!canvas.getContext) {
return;
}
options = $.extend({
source: 'body',
radius: 5,
overlay: '',
offset: {
x: 0,
y: 0
},
optClass: '',
cache: false,
cacheKeyPrefix: 'blurjs-',
draggable: false,
debug: false
}, options);
// Stackblur, courtesy of Mario Klingemann: http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
var mul_table = [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];
var shg_table = [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];
function stackBlurCanvasRGB(a, b, c, d, f, g) {
if(isNaN(g) || g < 1) return;
g |= 0;
var h = a.getContext("2d");
var j;
try {
try {
j = h.getImageData(b, c, d, f)
} catch(e) {
try {
netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
j = h.getImageData(b, c, d, f)
} catch(e) {
alert("Cannot access local image");
throw new Error("unable to access local image data: " + e);
}
}
} catch(e) {
alert("Cannot access image");
throw new Error("unable to access image data: " + e);
}
var k = j.data;
var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, r_out_sum, g_out_sum, b_out_sum, r_in_sum, g_in_sum, b_in_sum, pr, pg, pb, rbs;
var l = g + g + 1;
var m = d << 2;
var n = d - 1;
var o = f - 1;
var q = g + 1;
var r = q * (q + 1) / 2;
var s = new BlurStack();
var t = s;
for(i = 1; i < l; i++) {
t = t.next = new BlurStack();
if(i == q) var u = t
}
t.next = s;
var v = null;
var w = null;
yw = yi = 0;
var z = mul_table[g];
var A = shg_table[g];
for(y = 0; y < f; y++) {
r_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0;
r_out_sum = q * (pr = k[yi]);
g_out_sum = q * (pg = k[yi + 1]);
b_out_sum = q * (pb = k[yi + 2]);
r_sum += r * pr;
g_sum += r * pg;
b_sum += r * pb;
t = s;
for(i = 0; i < q; i++) {
t.r = pr;
t.g = pg;
t.b = pb;
t = t.next
}
for(i = 1; i < q; i++) {
p = yi + ((n < i ? n : i) << 2);
r_sum += (t.r = (pr = k[p])) * (rbs = q - i);
g_sum += (t.g = (pg = k[p + 1])) * rbs;
b_sum += (t.b = (pb = k[p + 2])) * rbs;
r_in_sum += pr;
g_in_sum += pg;
b_in_sum += pb;
t = t.next
}
v = s;
w = u;
for(x = 0; x < d; x++) {
k[yi] = (r_sum * z) >> A;
k[yi + 1] = (g_sum * z) >> A;
k[yi + 2] = (b_sum * z) >> A;
r_sum -= r_out_sum;
g_sum -= g_out_sum;
b_sum -= b_out_sum;
r_out_sum -= v.r;
g_out_sum -= v.g;
b_out_sum -= v.b;
p = (yw + ((p = x + g + 1) < n ? p : n)) << 2;
r_in_sum += (v.r = k[p]);
g_in_sum += (v.g = k[p + 1]);
b_in_sum += (v.b = k[p + 2]);
r_sum += r_in_sum;
g_sum += g_in_sum;
b_sum += b_in_sum;
v = v.next;
r_out_sum += (pr = w.r);
g_out_sum += (pg = w.g);
b_out_sum += (pb = w.b);
r_in_sum -= pr;
g_in_sum -= pg;
b_in_sum -= pb;
w = w.next;
yi += 4
}
yw += d
}
for(x = 0; x < d; x++) {
g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0;
yi = x << 2;
r_out_sum = q * (pr = k[yi]);
g_out_sum = q * (pg = k[yi + 1]);
b_out_sum = q * (pb = k[yi + 2]);
r_sum += r * pr;
g_sum += r * pg;
b_sum += r * pb;
t = s;
for(i = 0; i < q; i++) {
t.r = pr;
t.g = pg;
t.b = pb;
t = t.next
}
yp = d;
for(i = 1; i <= g; i++) {
yi = (yp + x) << 2;
r_sum += (t.r = (pr = k[yi])) * (rbs = q - i);
g_sum += (t.g = (pg = k[yi + 1])) * rbs;
b_sum += (t.b = (pb = k[yi + 2])) * rbs;
r_in_sum += pr;
g_in_sum += pg;
b_in_sum += pb;
t = t.next;
if(i < o) {
yp += d
}
}
yi = x;
v = s;
w = u;
for(y = 0; y < f; y++) {
p = yi << 2;
k[p] = (r_sum * z) >> A;
k[p + 1] = (g_sum * z) >> A;
k[p + 2] = (b_sum * z) >> A;
r_sum -= r_out_sum;
g_sum -= g_out_sum;
b_sum -= b_out_sum;
r_out_sum -= v.r;
g_out_sum -= v.g;
b_out_sum -= v.b;
p = (x + (((p = y + q) < o ? p : o) * d)) << 2;
r_sum += (r_in_sum += (v.r = k[p]));
g_sum += (g_in_sum += (v.g = k[p + 1]));
b_sum += (b_in_sum += (v.b = k[p + 2]));
v = v.next;
r_out_sum += (pr = w.r);
g_out_sum += (pg = w.g);
b_out_sum += (pb = w.b);
r_in_sum -= pr;
g_in_sum -= pg;
b_in_sum -= pb;
w = w.next;
yi += d
}
}
h.putImageData(j, b, c)
}
function BlurStack() {
this.r = 0;
this.g = 0;
this.b = 0;
this.a = 0;
this.next = null
}
return this.each(function () {
var $glue = $(this);
var $source = $(options.source);
var formattedSource = ($source.css('backgroundImage')).replace(/"/g, "").replace(/url\(|\)$/ig, "");
ctx = canvas.getContext('2d');
tempImg = new Image();
tempImg.onload = function () {
if(!isCached) {
canvas.style.display = "none";
canvas.width = tempImg.width;
canvas.height = tempImg.height;
ctx.drawImage(tempImg, 0, 0);
stackBlurCanvasRGB(canvas, 0, 0, canvas.width, canvas.height, options.radius);
if(options.overlay != false) {
ctx.beginPath();
ctx.rect(0, 0, tempImg.width, tempImg.width);
ctx.fillStyle = options.overlay;
ctx.fill();
}
var blurredData = canvas.toDataURL();
if(options.cache) {
try {
if(options.debug) {
console.log('Cache Set');
}
localStorage.setItem(options.cacheKeyPrefix + selector + '-' + formattedSource + '-data-image', blurredData);
} catch(e) {
console.log(e);
}
}
} else {
var blurredData = tempImg.src;
}
var attachment = $source.css('backgroundAttachment');
var position = (attachment == 'fixed') ? '' : '-' + (($glue.offset().left) - ($source.offset().left) - (options.offset.x)) + 'px -' + (($glue.offset().top) - ($source.offset().top) - (options.offset.y)) + 'px';
$glue.css({
'background-image': 'url("' + blurredData + '")',
'background-repeat': $source.css('backgroundRepeat'),
'background-position': position,
'background-attachment': attachment
});
if(options.optClass != false) {
$glue.addClass(options.optClass);
}
if(options.draggable) {
$glue.css({
'background-attachment': 'fixed',
'background-position': '0 0'
});
$glue.draggable();
}
};
Storage.prototype.cacheChecksum = function (opts) {
var newData = '';
for(var key in opts) {
var obj = opts[key];
if(obj.toString() == '[object Object]') {
newData += ((obj.x).toString() + (obj.y).toString() + ",").replace(/[^a-zA-Z0-9]/g, "");
} else {
newData += (obj + ",").replace(/[^a-zA-Z0-9]/g, "");
}
}
var originalData = this.getItem(options.cacheKeyPrefix + selector + '-' + formattedSource + '-options-cache');
if(originalData != newData) {
this.removeItem(options.cacheKeyPrefix + selector + '-' + formattedSource + '-options-cache');
this.setItem(options.cacheKeyPrefix + selector + '-' + formattedSource + '-options-cache', newData);
if(options.debug) {
console.log('Settings Changed, Cache Emptied');
}
}
};
var cachedData = null;
if(options.cache) {
localStorage.cacheChecksum(options);
cachedData = localStorage.getItem(options.cacheKeyPrefix + selector + '-' + formattedSource + '-data-image');
}
if(cachedData != null) {
if(options.debug) {
console.log('Cache Used');
}
isCached = true;
tempImg.src = (cachedData);
} else {
if(options.debug) {
console.log('Source Used');
}
tempImg.src = formattedSource;
}
});
};
})(jQuery);