Invert filter

scripts/filters/filter.js

@@ -55,6 +55,6 @@ function Filter()
   
   this.pixels = function()
   {
-    return this.context().getImageData(0,0,ronin.surface.size.width,ronin.surface.size.height);
+    return ronin.surface.active_layer.context().getImageData(0,0,ronin.surface.size.width * 2,ronin.surface.size.height * 2);
   }
 }

scripts/filters/invert.js

@@ -0,0 +1,26 @@
+function Filter_Invert()
+{
+  Filter.call(this);
+  this.parameters = [Angle];
+
+  this.render = function(cmd)
+  {
+    var imageObj = new Image();
+    imageObj.src = ronin.surface.active_layer.element.toDataURL('image/png');
+
+    var context = ronin.surface.active_layer.context();
+
+    var imageData = context.getImageData(0, 0, imageObj.width * 2, imageObj.height* 2);
+    var data = imageData.data;
+
+    for(var i = 0; i < data.length; i += 4) {
+      data[i] = 255 - data[i];
+      data[i + 1] = 255 - data[i + 1];
+      data[i + 2] = 255 - data[i + 2];
+    }
+
+    ronin.surface.active_layer.clear();
+    context.putImageData(imageData, 0, 0);
+  }
+  
+}