stackblur-min.js

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 stackBlurImage(imageID,canvasID,radius,blurAlphaChannel){var img=document.getElementById(imageID);var w=img.naturalWidth;var h=img.naturalHeight;var canvas=document.getElementById(canvasID);canvas.style.width=w+"px";canvas.style.height=h+"px";canvas.width=w;canvas.height=h;var context=canvas.getContext("2d");context.clearRect(0,0,w,h);context.drawImage(img,0,0);if(isNaN(radius)||radius<1)return;if(blurAlphaChannel)stackBlurCanvasRGBA(canvasID,0,0,w,h,radius);else stackBlurCanvasRGB(canvasID,0,0,w,h,radius)}function stackBlurCanvasRGBA(id,top_x,top_y,width,height,radius){if(isNaN(radius)||radius<1)return;radius|=0;var canvas=document.getElementById(id);var context=canvas.getContext("2d");var imageData;try{try{imageData=context.getImageData(top_x,top_y,width,height)}catch(e){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 stackBlurCanvasRGB(id,top_x,top_y,width,height,radius){if(isNaN(radius)||radius<1)return;radius|=0;var canvas=document.getElementById(id);var context=canvas.getContext("2d");var imageData;try{try{imageData=context.getImageData(top_x,top_y,width,height)}catch(e){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,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 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=r_sum=g_sum=b_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]);r_sum+=sumFactor*pr;g_sum+=sumFactor*pg;b_sum+=sumFactor*pb;stack=stackStart;for(i=0;i<radiusPlus1;i++){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=pr=pixels[p])*(rbs=radiusPlus1-i);g_sum+=(stack.g=pg=pixels[p+1])*rbs;b_sum+=(stack.b=pb=pixels[p+2])*rbs;r_in_sum+=pr;g_in_sum+=pg;b_in_sum+=pb;stack=stack.next}stackIn=stackStart;stackOut=stackEnd;for(x=0;x<width;x++){pixels[yi]=r_sum*mul_sum>>shg_sum;pixels[yi+1]=g_sum*mul_sum>>shg_sum;pixels[yi+2]=b_sum*mul_sum>>shg_sum;r_sum-=r_out_sum;g_sum-=g_out_sum;b_sum-=b_out_sum;r_out_sum-=stackIn.r;g_out_sum-=stackIn.g;b_out_sum-=stackIn.b;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];r_sum+=r_in_sum;g_sum+=g_in_sum;b_sum+=b_in_sum;stackIn=stackIn.next;r_out_sum+=pr=stackOut.r;g_out_sum+=pg=stackOut.g;b_out_sum+=pb=stackOut.b;r_in_sum-=pr;g_in_sum-=pg;b_in_sum-=pb;stackOut=stackOut.next;yi+=4}yw+=width}for(x=0;x<width;x++){g_in_sum=b_in_sum=r_in_sum=g_sum=b_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]);r_sum+=sumFactor*pr;g_sum+=sumFactor*pg;b_sum+=sumFactor*pb;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=pr=pixels[yi])*(rbs=radiusPlus1-i);g_sum+=(stack.g=pg=pixels[yi+1])*rbs;b_sum+=(stack.b=pb=pixels[yi+2])*rbs;r_in_sum+=pr;g_in_sum+=pg;b_in_sum+=pb;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]=r_sum*mul_sum>>shg_sum;pixels[p+1]=g_sum*mul_sum>>shg_sum;pixels[p+2]=b_sum*mul_sum>>shg_sum;r_sum-=r_out_sum;g_sum-=g_out_sum;b_sum-=b_out_sum;r_out_sum-=stackIn.r;g_out_sum-=stackIn.g;b_out_sum-=stackIn.b;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];stackIn=stackIn.next;r_out_sum+=pr=stackOut.r;g_out_sum+=pg=stackOut.g;b_out_sum+=pb=stackOut.b;r_in_sum-=pr;g_in_sum-=pg;b_in_sum-=pb;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}