var passLine = null;

 	function setFunction(strFunction) { 
		eval("passLine = " + strFunction );
		captureToCanvas();
	} 

	var gCtx = null;
	var gCanvas = null;

	var imageData = null;
	var ii=0;
	var jj=0;
	var c=0;

	function pageLoad() { 
		initCanvas(320,240);
	} 


	function initCanvas(ww,hh)
	{
		gCanvas = document.getElementById("canvas");
		var w = ww;
		var h = hh;
		gCanvas.style.width = w + "px";
		gCanvas.style.height = h + "px";
		gCanvas.width = w;
		gCanvas.height = h;
		gCtx = gCanvas.getContext("2d");
		gCtx.clearRect(0, 0, w, h);
		imageData = gCtx.getImageData( 0,0,320,240);
	}

	function passLineNormal(stringPixels) { 
		//a = (intVal >> 24) & 0xff;

		var coll = stringPixels.split("-");
	
		for(var i=0;i<320;i++) { 
			var intVal = parseInt(coll[i]);
			r = (intVal >> 16) & 0xff;
			g = (intVal >> 8) & 0xff;
			b = (intVal ) & 0xff;
			imageData.data[c+0]=r;
			imageData.data[c+1]=g;
			imageData.data[c+2]=b;
			imageData.data[c+3]=255;
			c+=4;
		} 

		if(c>=320*240*4) { 
			c=0;
      			gCtx.putImageData(imageData, 0,0);
		} 
 	} 

        function captureToCanvas() {
		flash = document.getElementById("embedflash");
		flash.ccCapture();
        }


	function passLineRed(stringPixels) { 
		//a = (intVal >> 24) & 0xff;

		var coll = stringPixels.split("-");
	
		for(var i=0;i<320;i++) { 
			var intVal = parseInt(coll[i]);
			r = (intVal >> 16) & 0xff;
			g = (intVal >> 8) & 0xff;
			b = (intVal ) & 0xff;
			imageData.data[c+0]=r;
			imageData.data[c+1]=0;
			imageData.data[c+2]=0;
			imageData.data[c+3]=255;
			c+=4;
		} 

		if(c>=320*240*4) { 
			c=0;
      			gCtx.putImageData(imageData, 0,0);
		} 
 	} 


	function passLineGrayscale(stringPixels) { 
		//a = (intVal >> 24) & 0xff;

		var coll = stringPixels.split("-");
	
		for(var i=0;i<320;i++) { 
			var intVal = parseInt(coll[i]);
			r = (intVal >> 16) & 0xff;
			g = (intVal >> 8) & 0xff;
			b = (intVal ) & 0xff;

			var media = parseInt( (r+g+b) /3 ); 

			imageData.data[c+0]=media;
			imageData.data[c+1]=media;
			imageData.data[c+2]=media;
			imageData.data[c+3]=255;
			c+=4;
		} 

		if(c>=320*240*4) { 
			c=0;
      			gCtx.putImageData(imageData, 0,0);
		} 
 	} 


	function passLineInverse(stringPixels) { 
		//a = (intVal >> 24) & 0xff;

		var coll = stringPixels.split("-");
	
		for(var i=0;i<320;i++) { 
			var intVal = parseInt(coll[i]);
			r = (intVal >> 16) & 0xff;
			g = (intVal >> 8) & 0xff;
			b = (intVal ) & 0xff;

			var media = parseInt( (r+g+b) /3 ); 

			imageData.data[c+0]=media;
			imageData.data[c+1]=media;
			imageData.data[c+2]=media;
			imageData.data[c+3]=255;

			if(c>1) { 
				var diffMedia = 255-media; 
				media = diffMedia; 
				imageData.data[c+0]=media;
				imageData.data[c+1]=media;
				imageData.data[c+2]=media;
				imageData.data[c+3]=255;

			} 
			c+=4;
		} 

		if(c>=320*240*4) { 
			c=0;
      			gCtx.putImageData(imageData, 0,0);
		} 
 	} 


	function passLineEmboss(stringPixels) { 
		//a = (intVal >> 24) & 0xff;

		var coll = stringPixels.split("-");
	
		for(var i=0;i<320;i++) { 
			var intVal = parseInt(coll[i]);
			r = (intVal >> 16) & 0xff;
			g = (intVal >> 8) & 0xff;
			b = (intVal ) & 0xff;

			var media = parseInt( (r+g+b) /3 ); 

			imageData.data[c+0]=media;
			imageData.data[c+1]=media;
			imageData.data[c+2]=media;
			imageData.data[c+3]=255;

			if(c>7) { 
		
				mOld = imageData.data[c-8+0];
				mOld = imageData.data[c-8+1];
				mOld = imageData.data[c-8+2];

				var diffMedia = 255-media; 
				media = diffMedia; 

				mNew = parseInt((mOld + media )/ 2);

				imageData.data[c-8+0]=mNew;
				imageData.data[c-8+1]=mNew;
				imageData.data[c-8+2]=mNew;

			} 
			c+=4;
		} 

		if(c>=320*240*4) { 
			c=0;
      			gCtx.putImageData(imageData, 0,0);
		} 



 	} 


   function copyImageToCanvas(aImg,x,y)
    {
      gCtx.drawImage(aImg, x,y);
    }

        function setImage(srcFile,x,y) {
          var img = new Image();
          img.src=srcFile;
          img.onload = function() { copyImageToCanvas(img,x,y); }
        }