text: /*
  
  Superfast Blur - a fast Box Blur For Canvas
  
  Version: 	0.5
  Author:		Mario Klingemann
  Contact: 	mario@quasimondo.com
  Website:	http://www.quasimondo.com/BoxBlurForCanvas
  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/140066/Superfast-Blur-a-pretty-fast-Box-Blur-Effect-for-CanvasJavascript
  
  Copyright (c) 2011 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 = [ 1,57,41,21,203,34,97,73,227,91,149,62,105,45,39,137,241,107,3,173,39,71,65,238,219,101,187,87,81,151,141,133,249,117,221,209,197,187,177,169,5,153,73,139,133,127,243,233,223,107,103,99,191,23,177,171,165,159,77,149,9,139,135,131,253,245,119,231,224,109,211,103,25,195,189,23,45,175,171,83,81,79,155,151,147,9,141,137,67,131,129,251,123,30,235,115,113,221,217,53,13,51,50,49,193,189,185,91,179,175,43,169,83,163,5,79,155,19,75,147,145,143,35,69,17,67,33,65,255,251,247,243,239,59,29,229,113,111,219,27,213,105,207,51,201,199,49,193,191,47,93,183,181,179,11,87,43,85,167,165,163,161,159,157,155,77,19,75,37,73,145,143,141,35,138,137,135,67,33,131,129,255,63,250,247,61,121,239,237,117,29,229,227,225,111,55,109,216,213,211,209,207,205,203,201,199,197,195,193,48,190,47,93,185,183,181,179,178,176,175,173,171,85,21,167,165,41,163,161,5,79,157,78,154,153,19,75,149,74,147,73,144,143,71,141,140,139,137,17,135,134,133,66,131,65,129,1];
          
     
  var shg_table = [0,9,10,10,14,12,14,14,16,15,16,15,16,15,15,17,18,17,12,18,16,17,17,19,19,18,19,18,18,19,19,19,20,19,20,20,20,20,20,20,15,20,19,20,20,20,21,21,21,20,20,20,21,18,21,21,21,21,20,21,17,21,21,21,22,22,21,22,22,21,22,21,19,22,22,19,20,22,22,21,21,21,22,22,22,18,22,22,21,22,22,23,22,20,23,22,22,23,23,21,19,21,21,21,23,23,23,22,23,23,21,23,22,23,18,22,23,20,22,23,23,23,21,22,20,22,21,22,24,24,24,24,24,22,21,24,23,23,24,21,24,23,24,22,24,24,22,24,24,22,23,24,24,24,20,23,22,23,24,24,24,24,24,24,24,23,21,23,22,23,24,24,24,22,24,24,24,23,22,24,24,25,23,25,25,23,24,25,25,24,22,25,25,25,24,23,24,25,25,25,25,25,25,25,25,25,25,25,25,23,25,23,24,25,25,25,25,25,25,25,25,25,24,22,25,25,23,25,25,20,24,25,24,25,25,22,24,25,24,25,24,25,25,24,25,25,25,25,22,25,25,25,24,25,24,25,18];
  
  function boxBlurCanvasRGBA(canvas, top_x, top_y, width, height, radius, iterations ){
  	if ( isNaN(radius) || radius < 1 ) return;
  	
  	radius |= 0;
  	
  	if ( isNaN(iterations) ) iterations = 1;
  	iterations |= 0;
  	if ( iterations > 3 ) iterations = 3;
  	if ( iterations < 1 ) iterations = 1;
  
      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);
  	  return;
  	}
  			
  	var pixels = imageData.data;
  		
  	var rsum,gsum,bsum,asum,x,y,i,p,p1,p2,yp,yi,yw,idx,pa;		
  	var wm = width - 1;
    	var hm = height - 1;
      var wh = width * height;
  	var rad1 = radius + 1;
      
  	var mul_sum = mul_table[radius];
  	var shg_sum = shg_table[radius];
  
  	var r = [];
      var g = [];
      var b = [];
  	var a = [];
  	
  	var vmin = [];
  	var vmax = [];
    
  	while ( iterations-- > 0 ){
  		yw = yi = 0;
  	 
  		for ( y=0; y < height; y++ ){
  			rsum = pixels[yw]   * rad1;
  			gsum = pixels[yw+1] * rad1;
  			bsum = pixels[yw+2] * rad1;
  			asum = pixels[yw+3] * rad1;
  			
  			
  			for( i = 1; i <= radius; i++ ){
  				p = yw + (((i > wm ? wm : i )) << 2 );
  				rsum += pixels[p++];
  				gsum += pixels[p++];
  				bsum += pixels[p++];
  				asum += pixels[p]
  			}
  			
  			for ( x = 0; x < width; x++ ) {
  				r[yi] = rsum;
  				g[yi] = gsum;
  				b[yi] = bsum;
  				a[yi] = asum;
  
  				if( y==0) {
  					vmin[x] = ( ( p = x + rad1) < wm ? p : wm ) << 2;
  					vmax[x] = ( ( p = x - radius) > 0 ? p << 2 : 0 );
  				} 
  				
  				p1 = yw + vmin[x];
  				p2 = yw + vmax[x];
  				  
  				rsum += pixels[p1++] - pixels[p2++];
  				gsum += pixels[p1++] - pixels[p2++];
  				bsum += pixels[p1++] - pixels[p2++];
  				asum += pixels[p1]   - pixels[p2];
  					 
  				yi++;
  			}
  			yw += ( width << 2 );
  		}
  	  
  		for ( x = 0; x < width; x++ ) {
  			yp = x;
  			rsum = r[yp] * rad1;
  			gsum = g[yp] * rad1;
  			bsum = b[yp] * rad1;
  			asum = a[yp] * rad1;
  			
  			for( i = 1; i <= radius; i++ ) {
  			  yp += ( i > hm ? 0 : width );
  			  rsum += r[yp];
  			  gsum += g[yp];
  			  bsum += b[yp];
  			  asum += a[yp];
  			}
  			
  			yi = x << 2;
  			for ( y = 0; y < height; y++) {
  				
  				pixels[yi+3] = pa = (asum * mul_sum) >>> shg_sum;
  				if ( pa > 0 )
  				{
  					pa = 255 / pa;
  					pixels[yi]   = ((rsum * mul_sum) >>> shg_sum) * pa;
  					pixels[yi+1] = ((gsum * mul_sum) >>> shg_sum) * pa;
  					pixels[yi+2] = ((bsum * mul_sum) >>> shg_sum) * pa;
  				} else {
  					pixels[yi] = pixels[yi+1] = pixels[yi+2] = 0;
  				}				
  				if( x == 0 ) {
  					vmin[y] = ( ( p = y + rad1) < hm ? p : hm ) * width;
  					vmax[y] = ( ( p = y - radius) > 0 ? p * width : 0 );
  				} 
  			  
  				p1 = x + vmin[y];
  				p2 = x + vmax[y];
  
  				rsum += r[p1] - r[p2];
  				gsum += g[p1] - g[p2];
  				bsum += b[p1] - b[p2];
  				asum += a[p1] - a[p2];
  
  				yi += width << 2;
  			}
  		}
  	}
  	
  	context.putImageData( imageData, top_x, top_y );
  	
  }