/*

CanvasBlur - InfinitySlider Extension
Version: 1.0
Author: Epeo
Website: demo.epeo.it/infinityslider

Based on algorithm of:
StackBoxBlur - Mario Klingemann - http://www.quasimondo.com

*/
var mul_table = [ 1,171,205,293,57,373,79,137,241,27,391,357,41,19,283,265,497,469,443,421,25,191,365,349,335,161,155,149,9,278,269,261,505,245,475,231,449,437,213,415,405,395,193,377,369,361,353,345,169,331,325,319,313,307,301,37,145,285,281,69,271,267,263,259,509,501,493,243,479,118,465,459,113,446,55,435,429,423,209,413,51,403,199,393,97,3,379,375,371,367,363,359,355,351,347,43,85,337,333,165,327,323,5,317,157,311,77,305,303,75,297,294,73,289,287,71,141,279,277,275,68,135,67,133,33,262,260,129,511,507,503,499,495,491,61,121,481,477,237,235,467,232,115,457,227,451,7,445,221,439,218,433,215,427,425,211,419,417,207,411,409,203,202,401,399,396,197,49,389,387,385,383,95,189,47,187,93,185,23,183,91,181,45,179,89,177,11,175,87,173,345,343,341,339,337,21,167,83,331,329,327,163,81,323,321,319,159,79,315,313,39,155,309,307,153,305,303,151,75,299,149,37,295,147,73,291,145,289,287,143,285,71,141,281,35,279,139,69,275,137,273,17,271,135,269,267,133,265,33,263,131,261,130,259,129,257,1];
var shg_table = [0,9,10,11,9,12,10,11,12,9,13,13,10,9,13,13,14,14,14,14,10,13,14,14,14,13,13,13,9,14,14,14,15,14,15,14,15,15,14,15,15,15,14,15,15,15,15,15,14,15,15,15,15,15,15,12,14,15,15,13,15,15,15,15,16,16,16,15,16,14,16,16,14,16,13,16,16,16,15,16,13,16,15,16,14,9,16,16,16,16,16,16,16,16,16,13,14,16,16,15,16,16,10,16,15,16,14,16,16,14,16,16,14,16,16,14,15,16,16,16,14,15,14,15,13,16,16,15,17,17,17,17,17,17,14,15,17,17,16,16,17,16,15,17,16,17,11,17,16,17,16,17,16,17,17,16,17,17,16,17,17,16,16,17,17,17,16,14,17,17,17,17,15,16,14,16,15,16,13,16,15,16,14,16,15,16,12,16,15,16,17,17,17,17,17,13,16,15,17,17,17,16,15,17,17,17,16,15,17,17,14,16,17,17,16,17,17,16,15,17,16,14,17,16,15,17,16,17,17,16,17,15,16,17,14,17,16,15,17,16,17,13,17,16,17,17,16,17,14,17,16,17,16,17,16,17,9];

function canvasBlur(valuecanvas, valuewidth, valueheight, valueradius) {
	
	var canvas  = valuecanvas;
	var context = canvas.getContext("2d");
	var top_x = 0;
	var top_y = 0;
	var width = valuewidth;
	var height = valueheight;
	var radius = valueradius;
	
	var iterations = 2;

	var imageData = context.getImageData( top_x, top_y, width, height );
			
	var pixels = imageData.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 div = radius + radius + 1;
	var w4 = width << 2;
	var widthMinus1  = width - 1;
	var heightMinus1 = height - 1;
	var radiusPlus1  = radius + 1;
	
	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 mul_sum = mul_table[radius];
	var shg_sum = shg_table[radius];
	
	while ( iterations-- > 0 ) {
		yw = yi = 0;
		
		for ( y = height; --y >-1; )
		{
			r_sum = radiusPlus1 * ( pr = pixels[yi] );
			g_sum = radiusPlus1 * ( pg = pixels[yi+1] );
			b_sum = radiusPlus1 * ( pb = pixels[yi+2] );
			
			stack = stackStart;
			
			for( i = radiusPlus1; --i > -1; )
			{
				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 );
				r_sum += ( stack.r = pixels[p++]);
				g_sum += ( stack.g = pixels[p++]);
				b_sum += ( stack.b = pixels[p]);
				
				stack = stack.next;
			}
			
			stackIn = stackStart;
			for ( x = 0; x < width; x++ )
			{
				pixels[yi++] = (r_sum * mul_sum) >>> shg_sum;
				pixels[yi++] = (g_sum * mul_sum) >>> shg_sum;
				pixels[yi++] = (b_sum * mul_sum) >>> shg_sum;
				yi++;
				
				p =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2;
				
				r_sum -= stackIn.r - ( stackIn.r = pixels[p++]);
				g_sum -= stackIn.g - ( stackIn.g = pixels[p++]);
				b_sum -= stackIn.b - ( stackIn.b = pixels[p]);
				
				stackIn = stackIn.next;
			}
			yw += width;
		}

		
		for ( x = 0; x < width; x++ )
		{
			yi = x << 2;
			
			r_sum = radiusPlus1 * ( pr = pixels[yi++]);
			g_sum = radiusPlus1 * ( pg = pixels[yi++]);
			b_sum = radiusPlus1 * ( pb = pixels[yi]);
			
			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;
				
				r_sum += ( stack.r = pixels[yi++]);
				g_sum += ( stack.g = pixels[yi++]);
				b_sum += ( stack.b = pixels[yi]);
				
				stack = stack.next;
			
				if ( i < heightMinus1 ) yp += width;
			}
			
			yi = x;
			stackIn = stackStart;
			for ( y = 0; y < height; y++ )
			{
				p = yi << 2;
				pixels[p]   = (r_sum * mul_sum) >>> shg_sum;
				pixels[p+1] = (g_sum * mul_sum) >>> shg_sum;
				pixels[p+2] = (b_sum * mul_sum) >>> shg_sum;
				
				p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2;
				
				r_sum -= stackIn.r - ( stackIn.r = pixels[p]);
				g_sum -= stackIn.g - ( stackIn.g = pixels[p+1]);
				b_sum -= stackIn.b - ( stackIn.b = pixels[p+2]);
				
				stackIn = stackIn.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;
}