Index: lams_central/web/includes/javascript/canvg/StackBlur.js =================================================================== RCS file: /usr/local/cvsroot/lams_central/web/includes/javascript/canvg/StackBlur.js,v diff -u -r1.1 -r1.2 --- lams_central/web/includes/javascript/canvg/StackBlur.js 8 May 2014 12:07:26 -0000 1.1 +++ lams_central/web/includes/javascript/canvg/StackBlur.js 3 Sep 2015 05:42:43 -0000 1.2 @@ -39,573 +39,617 @@ 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 ( global ) { -function stackBlurImage( imageID, canvasID, radius, blurAlphaChannel ) -{ + 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 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 ); + + 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 ]; - 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) { - - // 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++ ) + function premultiplyAlpha(imageData) { - 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; + var pixels = imageData.data; + var size = imageData.width * imageData.height * 4; - 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++ ) + for (var i=0; i> shg_sum; - if ( pa != 0 ) + var a = pixels[i+3]; + if (a != 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; + a = 255 / a; + pixels[i ] *= a; + pixels[i+1] *= a; + pixels[i+2] *= a; } - - 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++ ) + function stackBlurImage( imageID, canvasID, radius, blurAlphaChannel ) { - g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0; + + 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; - 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]); + var context = canvas.getContext("2d"); + context.clearRect( 0, 0, w, h ); + context.drawImage( img, 0, 0 ); + + if ( isNaN(radius) || radius < 1 ) return; - r_sum += sumFactor * pr; - g_sum += sumFactor * pg; - b_sum += sumFactor * pb; - a_sum += sumFactor * pa; + 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; - stack = stackStart; + var canvas = document.getElementById( id ); + var context = canvas.getContext("2d"); + var imageData; - for( i = 0; i < radiusPlus1; i++ ) + 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); + } + + premultiplyAlpha(imageData); + + 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.r = pr; - stack.g = pg; - stack.b = pb; - stack.a = pa; - stack = stack.next; + stack = stack.next = new BlurStack(); + if ( i == radiusPlus1 ) var stackEnd = stack; } + stack.next = stackStart; + var stackIn = null; + var stackOut = null; - yp = width; + yw = yi = 0; - for( i = 1; i <= radius; i++ ) + var mul_sum = mul_table[radius]; + var shg_sum = shg_table[radius]; + + for ( y = 0; y < height; y++ ) { - yi = ( yp + x ) << 2; + r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0; - 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; + 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] ); - stack = stack.next; - - if( i < heightMinus1 ) + r_sum += sumFactor * pr; + g_sum += sumFactor * pg; + b_sum += sumFactor * pb; + a_sum += sumFactor * pa; + + stack = stackStart; + + for( i = 0; i < radiusPlus1; i++ ) { - yp += width; + 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] = (r_sum * mul_sum) >> shg_sum; + pixels[yi+1] = (g_sum * mul_sum) >> shg_sum; + pixels[yi+2] = (b_sum * mul_sum) >> shg_sum; + pixels[yi+3] = (a_sum * mul_sum) >> shg_sum; + + 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; } + - yi = x; - stackIn = stackStart; - stackOut = stackEnd; - for ( y = 0; y < height; y++ ) + for ( x = 0; x < width; x++ ) { - 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; - } + g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 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; + 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]); - p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2; + r_sum += sumFactor * pr; + g_sum += sumFactor * pg; + b_sum += sumFactor * pb; + a_sum += sumFactor * pa; - 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; + stack = stackStart; - r_out_sum += ( pr = stackOut.r ); - g_out_sum += ( pg = stackOut.g ); - b_out_sum += ( pb = stackOut.b ); - a_out_sum += ( pa = stackOut.a ); + for( i = 0; i < radiusPlus1; i++ ) + { + stack.r = pr; + stack.g = pg; + stack.b = pb; + stack.a = pa; + stack = stack.next; + } - r_in_sum -= pr; - g_in_sum -= pg; - b_in_sum -= pb; - a_in_sum -= pa; + yp = width; - stackOut = stackOut.next; + 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; - yi += width; + 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; + pixels[p+3] = (a_sum * mul_sum) >> shg_sum; + + 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; + } } + + unpremultiplyAlpha(imageData); + + context.putImageData( imageData, top_x, top_y ); } - - 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) { - - // 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 ); + 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 { - netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead"); + 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 local image"); - throw new Error("unable to access local image data: " + e); - return; + alert("Cannot access image"); + throw new Error("unable to access image data: " + e); } - } - } 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; + + 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; - 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++ ) + var stackStart = new BlurStack(); + var stack = stackStart; + for ( i = 1; i < div; i++ ) { - stack.r = pr; - stack.g = pg; - stack.b = pb; - stack = stack.next; + stack = stack.next = new BlurStack(); + if ( i == radiusPlus1 ) var stackEnd = stack; } + stack.next = stackStart; + var stackIn = null; + var stackOut = null; - 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; - } + yw = yi = 0; + var mul_sum = mul_table[radius]; + var shg_sum = shg_table[radius]; - stackIn = stackStart; - stackOut = stackEnd; - for ( x = 0; x < width; x++ ) + for ( y = 0; y < height; y++ ) { - 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_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0; - r_sum -= r_out_sum; - g_sum -= g_out_sum; - b_sum -= b_out_sum; + r_out_sum = radiusPlus1 * ( pr = pixels[yi] ); + g_out_sum = radiusPlus1 * ( pg = pixels[yi+1] ); + b_out_sum = radiusPlus1 * ( pb = pixels[yi+2] ); - r_out_sum -= stackIn.r; - g_out_sum -= stackIn.g; - b_out_sum -= stackIn.b; + r_sum += sumFactor * pr; + g_sum += sumFactor * pg; + b_sum += sumFactor * pb; - p = ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2; + stack = stackStart; - r_in_sum += ( stackIn.r = pixels[p]); - g_in_sum += ( stackIn.g = pixels[p+1]); - b_in_sum += ( stackIn.b = pixels[p+2]); + for( i = 0; i < radiusPlus1; i++ ) + { + stack.r = pr; + stack.g = pg; + stack.b = pb; + stack = stack.next; + } - r_sum += r_in_sum; - g_sum += g_in_sum; - b_sum += b_in_sum; + 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 = 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; + 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; + yi += 4; + } + yw += width; } - 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++ ) + for ( x = 0; x < width; x++ ) { - stack.r = pr; - stack.g = pg; - stack.b = pb; - stack = stack.next; - } - - yp = width; - - for( i = 1; i <= radius; i++ ) - { - yi = ( yp + x ) << 2; + g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0; - 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; + 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_in_sum += pr; - g_in_sum += pg; - b_in_sum += pb; + r_sum += sumFactor * pr; + g_sum += sumFactor * pg; + b_sum += sumFactor * pb; - stack = stack.next; - - if( i < heightMinus1 ) + stack = stackStart; + + for( i = 0; i < radiusPlus1; i++ ) { - yp += width; + stack.r = pr; + stack.g = pg; + stack.b = pb; + stack = stack.next; } - } - - 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; + yp = width; - r_out_sum -= stackIn.r; - g_out_sum -= stackIn.g; - b_out_sum -= stackIn.b; + 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; - p = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2; + if( i < heightMinus1 ) + { + yp += width; + } + } - 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; + 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 ); + } - - context.putImageData( imageData, top_x, top_y ); - -} -function BlurStack() -{ - this.r = 0; - this.g = 0; - this.b = 0; - this.a = 0; - this.next = null; -} \ No newline at end of file + function BlurStack() + { + this.r = 0; + this.g = 0; + this.b = 0; + this.a = 0; + this.next = null; + } + + var stackBlur = { + image: stackBlurImage, + canvasRGBA: stackBlurCanvasRGBA, + canvasRGB: stackBlurCanvasRGB + }; + + // export as AMD... + if ( typeof define !== 'undefined' && define.amd ) { + define( function () { return stackBlur; }); + } + + // ...or as browserify + else if ( typeof module !== 'undefined' && module.exports ) { + module.exports = stackBlur; + } + + global.stackBlur = stackBlur; + +}( typeof window !== 'undefined' ? window : this )); \ No newline at end of file