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+/*
+
+This Snippet is using a modified Stack Blur js lib for blurring the header images.
+
+I could not use hosted images because Canvas cannot work with cross domain images. If you want to use hosted images make sure they are on the same domain.
+
+Have fun!
+
+*/
+
+/*
+
+StackBlur - a fast almost Gaussian Blur For Canvas
+
+Version: 0.5
+Author: Mario Klingemann
+Contact: mario@quasimondo.com
+Website: http://www.quasimondo.com/StackBlurForCanvas
+Twitter: @quasimondo
+
+In case you find this class useful - especially in commercial projects -
+I am not totally unhappy for a small donation to my PayPal account
+mario@quasimondo.de
+
+Or support me on flattr:
+https://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript
+
+Copyright (c) 2010 Mario Klingemann
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+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 stackBlurCanvasRGBA( canvas, top_x, top_y, width, height, radius )
+{
+ if ( isNaN(radius) || radius < 1 ) return;
+ radius |= 0;
+
+ var context = canvas.getContext("2d");
+ var imageData;
+
+ try {
+ try {
+ imageData = context.getImageData( top_x, top_y, width, height );
+ } catch(e) {
+
+ // NOTE: this part is supposedly only needed if you want to work with local files
+ // so it might be okay to remove the whole try/catch block and just use
+ // imageData = context.getImageData( top_x, top_y, width, height );
+ try {
+ netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
+ imageData = context.getImageData( top_x, top_y, width, height );
+ } catch(e) {
+ alert("Cannot access local image");
+ throw new Error("unable to access local image data: " + e);
+ return;
+ }
+ }
+ } catch(e) {
+ alert("Cannot access image");
+ throw new Error("unable to access image data: " + e);
+ }
+
+ var pixels = imageData.data;
+
+ var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, a_sum,
+ r_out_sum, g_out_sum, b_out_sum, a_out_sum,
+ r_in_sum, g_in_sum, b_in_sum, a_in_sum,
+ pr, pg, pb, pa, rbs;
+
+ var div = radius + radius + 1;
+ var w4 = width << 2;
+ var widthMinus1 = width - 1;
+ var heightMinus1 = height - 1;
+ var radiusPlus1 = radius + 1;
+ var sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2;
+
+ var stackStart = new BlurStack();
+ var stack = stackStart;
+ for ( i = 1; i < div; i++ )
+ {
+ stack = stack.next = new BlurStack();
+ if ( i == radiusPlus1 ) var stackEnd = stack;
+ }
+ stack.next = stackStart;
+ var stackIn = null;
+ var stackOut = null;
+
+ yw = yi = 0;
+
+ var mul_sum = mul_table[radius];
+ var shg_sum = shg_table[radius];
+
+ for ( y = 0; y < height; y++ )
+ {
+ r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0;
+
+ r_out_sum = radiusPlus1 * ( pr = pixels[yi] );
+ g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] );
+ b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] );
+ a_out_sum = radiusPlus1 * ( pa = pixels[yi+3] );
+
+ r_sum += sumFactor * pr;
+ g_sum += sumFactor * pg;
+ b_sum += sumFactor * pb;
+ a_sum += sumFactor * pa;
+
+ stack = stackStart;
+
+ for( i = 0; i < radiusPlus1; i++ )
+ {
+ stack.r = pr;
+ stack.g = pg;
+ stack.b = pb;
+ stack.a = pa;
+ stack = stack.next;
+ }
+
+ for( i = 1; i < radiusPlus1; i++ )
+ {
+ p = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 );
+ r_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i );
+ g_sum += ( stack.g = ( pg = pixels[p+1])) * rbs;
+ b_sum += ( stack.b = ( pb = pixels[p+2])) * rbs;
+ a_sum += ( stack.a = ( pa = pixels[p+3])) * rbs;
+
+ r_in_sum += pr;
+ g_in_sum += pg;
+ b_in_sum += pb;
+ a_in_sum += pa;
+
+ stack = stack.next;
+ }
+
+
+ stackIn = stackStart;
+ stackOut = stackEnd;
+ for ( x = 0; x < width; x++ )
+ {
+ pixels[yi+3] = pa = (a_sum * mul_sum) >> shg_sum;
+ if ( pa != 0 )
+ {
+ pa = 255 / pa;
+ pixels[yi] = ((r_sum * mul_sum) >> shg_sum) * pa;
+ pixels[yi+1] = ((g_sum * mul_sum) >> shg_sum) * pa;
+ pixels[yi+2] = ((b_sum * mul_sum) >> shg_sum) * pa;
+ } else {
+ pixels[yi] = pixels[yi+1] = pixels[yi+2] = 0;
+ }
+
+ r_sum -= r_out_sum;
+ g_sum -= g_out_sum;
+ b_sum -= b_out_sum;
+ a_sum -= a_out_sum;
+
+ r_out_sum -= stackIn.r;
+ g_out_sum -= stackIn.g;
+ b_out_sum -= stackIn.b;
+ a_out_sum -= stackIn.a;
+
+ p = ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2;
+
+ r_in_sum += ( stackIn.r = pixels[p]);
+ g_in_sum += ( stackIn.g = pixels[p+1]);
+ b_in_sum += ( stackIn.b = pixels[p+2]);
+ a_in_sum += ( stackIn.a = pixels[p+3]);
+
+ r_sum += r_in_sum;
+ g_sum += g_in_sum;
+ b_sum += b_in_sum;
+ a_sum += a_in_sum;
+
+ stackIn = stackIn.next;
+
+ r_out_sum += ( pr = stackOut.r );
+ g_out_sum += ( pg = stackOut.g );
+ b_out_sum += ( pb = stackOut.b );
+ a_out_sum += ( pa = stackOut.a );
+
+ r_in_sum -= pr;
+ g_in_sum -= pg;
+ b_in_sum -= pb;
+ a_in_sum -= pa;
+
+ stackOut = stackOut.next;
+
+ yi += 4;
+ }
+ yw += width;
+ }
+
+
+ for ( x = 0; x < width; x++ )
+ {
+ g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0;
+
+ yi = x << 2;
+ r_out_sum = radiusPlus1 * ( pr = pixels[yi]);
+ g_out_sum = radiusPlus1 * ( pg = pixels[yi+1]);
+ b_out_sum = radiusPlus1 * ( pb = pixels[yi+2]);
+ a_out_sum = radiusPlus1 * ( pa = pixels[yi+3]);
+
+ r_sum += sumFactor * pr;
+ g_sum += sumFactor * pg;
+ b_sum += sumFactor * pb;
+ a_sum += sumFactor * pa;
+
+ stack = stackStart;
+
+ for( i = 0; i < radiusPlus1; i++ )
+ {
+ stack.r = pr;
+ stack.g = pg;
+ stack.b = pb;
+ stack.a = pa;
+ stack = stack.next;
+ }
+
+ yp = width;
+
+ for( i = 1; i <= radius; i++ )
+ {
+ yi = ( yp + x ) << 2;
+
+ r_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i );
+ g_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs;
+ b_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs;
+ a_sum += ( stack.a = ( pa = pixels[yi+3])) * rbs;
+
+ r_in_sum += pr;
+ g_in_sum += pg;
+ b_in_sum += pb;
+ a_in_sum += pa;
+
+ 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+3] = pa = (a_sum * mul_sum) >> shg_sum;
+ if ( pa > 0 )
+ {
+ pa = 255 / pa;
+ pixels[p] = ((r_sum * mul_sum) >> shg_sum ) * pa;
+ pixels[p+1] = ((g_sum * mul_sum) >> shg_sum ) * pa;
+ pixels[p+2] = ((b_sum * mul_sum) >> shg_sum ) * pa;
+ } else {
+ pixels[p] = pixels[p+1] = pixels[p+2] = 0;
+ }
+
+ r_sum -= r_out_sum;
+ g_sum -= g_out_sum;
+ b_sum -= b_out_sum;
+ a_sum -= a_out_sum;
+
+ r_out_sum -= stackIn.r;
+ g_out_sum -= stackIn.g;
+ b_out_sum -= stackIn.b;
+ a_out_sum -= stackIn.a;
+
+ p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2;
+
+ r_sum += ( r_in_sum += ( stackIn.r = pixels[p]));
+ g_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]));
+ b_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]));
+ a_sum += ( a_in_sum += ( stackIn.a = pixels[p+3]));
+
+ stackIn = stackIn.next;
+
+ r_out_sum += ( pr = stackOut.r );
+ g_out_sum += ( pg = stackOut.g );
+ b_out_sum += ( pb = stackOut.b );
+ a_out_sum += ( pa = stackOut.a );
+
+ r_in_sum -= pr;
+ g_in_sum -= pg;
+ b_in_sum -= pb;
+ a_in_sum -= pa;
+
+ stackOut = stackOut.next;
+
+ yi += width;
+ }
+ }
+
+ context.putImageData( imageData, top_x, top_y );
+
+}
+
+function BlurStack()
+{
+ this.r = 0;
+ this.g = 0;
+ this.b = 0;
+ this.a = 0;
+ this.next = null;
+}
+
+$( document ).ready(function() {
+ var BLUR_RADIUS = 40;
+ var sourceImages = [];
+
+ $('.src-image').each(function(){
+ sourceImages.push($(this).attr('src'));
+ });
+
+ $('.avatar img').each(function(index){
+ $(this).attr('src', sourceImages[index] );
+ });
+
+ var drawBlur = function(canvas, image) {
+ var w = canvas.width;
+ var h = canvas.height;
+ var canvasContext = canvas.getContext('2d');
+ canvasContext.drawImage(image, 0, 0, w, h);
+ stackBlurCanvasRGBA(canvas, 0, 0, w, h, BLUR_RADIUS);
+ };
+
+
+ $('.card canvas').each(function(index){
+ var canvas = $(this)[0];
+
+ var image = new Image();
+ image.src = sourceImages[index];
+
+ image.onload = function() {
+ drawBlur(canvas, image);
+ }
+ });
+});
+
generated by cgit (git 2.34.1) at 2024-12-19 19:22:25 +0000