tieleman · January 11, 2017 23:10 · Jul 18, 2013 · Jul 18, 2013 · Jul 18, 2013
diff --git a/blur_worker.js b/blur_worker.js
@@ -2,9 +2,9 @@
 * BoxBlurFilter
 * Visit http://createjs.com/ for documentation, updates and examples.
 *
-* Adapted by Hiro to function as a standalone web worker. Pass it a message with
-* a data object supplying ImageData, a width, a height, a radius and
-* quality (number of passes). Returns a message with the resulting
+* Adapted by Hiro to function as a standalone web worker. Pass it a
+* message with a data object supplying ImageData, a radius and quality
+* (number of passes). Returns a message with the resulting
 * blurred ImageData.
 *
 *

diff --git a/blur_worker.js b/blur_worker.js
@@ -35,11 +35,13 @@
 */
 
 onmessage = function (event) {
-    blur(event.data.imageData, event.data.width, event.data.height, event.data.radius, event.data.quality);
+    blur(event.data.imageData, event.data.radius, event.data.quality);
 }
 
-function blur(imageData, width, height, radius, quality) {
+function blur(imageData, radius, quality) {
     var pixels = imageData.data;
+    var width = imageData.width;
+    var height = imageData.height;
 
     var rsum, gsum, bsum, asum, x, y, i, p, p1, p2, yp, yi, yw;
     var wm = width - 1;

diff --git a/blur_worker.js b/blur_worker.js
@@ -0,0 +1,143 @@
+/*
+* BoxBlurFilter
+* Visit http://createjs.com/ for documentation, updates and examples.
+*
+* Adapted by Hiro to function as a standalone web worker. Pass it a message with
+* a data object supplying ImageData, a width, a height, a radius and
+* quality (number of passes). Returns a message with the resulting
+* blurred ImageData.
+*
+*
+* Copyright (c) 2010 gskinner.com, inc.
+* With Portions Copyright (c) 2013 Hiro, http://www.madebyhiro.com/
+*
+* 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.
+*
+*/
+
+onmessage = function (event) {
+    blur(event.data.imageData, event.data.width, event.data.height, event.data.radius, event.data.quality);
+}
+
+function blur(imageData, width, height, radius, quality) {
+    var pixels = imageData.data;
+
+    var rsum, gsum, bsum, asum, x, y, i, p, p1, p2, yp, yi, yw;
+    var wm = width - 1;
+    var hm = height - 1;
+    var rad1x = radius + 1;
+    var divx = radius + rad1x;
+    var rad1y = radius + 1;
+    var divy = radius + rad1y;
+    var div2 = 1 / (divx * divy);
+
+    var r = [];
+    var g = [];
+    var b = [];
+    var a = [];
+
+    var vmin = [];
+    var vmax = [];
+
+    while (quality-- > 0) {
+        yw = yi = 0;
+
+        for (y = 0; y < height; y++) {
+            rsum = pixels[yw] * rad1x;
+            gsum = pixels[yw + 1] * rad1x;
+            bsum = pixels[yw + 2] * rad1x;
+            asum = pixels[yw + 3] * rad1x;
+
+
+            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] = Math.min(x + rad1x, wm) << 2;
+                    vmax[x] = Math.max(x - radius, 0) << 2;
+                }
+
+                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] * rad1y;
+            gsum = g[yp] * rad1y;
+            bsum = b[yp] * rad1y;
+            asum = a[yp] * rad1y;
+
+            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] = (rsum * div2 + 0.5) | 0;
+                pixels[yi + 1] = (gsum * div2 + 0.5) | 0;
+                pixels[yi + 2] = (bsum * div2 + 0.5) | 0;
+                pixels[yi + 3] = (asum * div2 + 0.5) | 0;
+
+                if (x == 0) {
+                    vmin[y] = Math.min(y + rad1y, hm) * width;
+                    vmax[y] = Math.max(y - radius, 0) * width;
+                }
+
+                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;
+            }
+        }
+    }
+    postMessage(imageData);
+}