Added setting for alpha channel faking.

_locales/de/messages.json

@@ -202,6 +202,15 @@
 		"description": ""
 	},
 	
+	"fakeAlphaChannel_title": {
+		"message": "Alhpa-Kanal auch vortäuschen",
+		"description": ""
+	},
+	"fakeAlphaChannel_description": {
+		"message": "Aktiviert das Vortäuschen des Alpha-Kanals (Transparenz).",
+		"description": ""
+	},
+	
 	"useCanvasCache_title": {
 		"message": "Zwischenspeicher für Canvas verwenden",
 		"description": ""

_locales/en/messages.json

@@ -202,6 +202,15 @@
 		"description": ""
 	},
 	
+	"fakeAlphaChannel_title": {
+		"message": "Fakt the alpha channel",
+		"description": ""
+	},
+	"fakeAlphaChannel_description": {
+		"message": "Activates the faking of the alhpa channel (transparency).",
+		"description": ""
+	},
+	
 	"useCanvasCache_title": {
 		"message": "Use canvas cache",
 		"description": ""

lib/defaultSettings.js

@@ -10,6 +10,7 @@ var settings = {
 	rng: "nonPersistent",
 	useCanvasCache: true,
 	ignoreFrequentColors: 0,
+	fakeAlphaChannel: false,
 	persistentRndStorage: "",
 	storePersistentRnd: false,
 	askOnlyOnce: true,

lib/modifiedAPI.js

@@ -77,7 +77,7 @@
 			}
 			
 			var rng = randomSupply.getPixelRng(l, window, ignoredColors);
-			
+			var fakeAlphaChannel = prefs("fakeAlphaChannel");
 			for (var i = 0; i < l; i += 4){
 				var [r, g, b, a] = rng(
 					source[i + 0], 
@@ -89,13 +89,14 @@
 				desc[i + 0] = r;
 				desc[i + 1] = g;
 				desc[i + 2] = b;
-				desc[i + 3] = a;
+				desc[i + 3] = fakeAlphaChannel? a: source[i + 3];
 			}
 			var canvas = original.cloneNode(true);
 			context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
 			context.putImageData(imageData, 0, 0);
 			if (prefs("useCanvasCache")){
 				canvasCache[originalDataURL] = canvas;
+				canvasCache[canvas.toDataURL()] = canvas;
 			}
 			return canvas;
 		}
@@ -373,7 +374,7 @@
 							ignoredColors = statistic.getMaxColors(prefs("ignoreFrequentColors"));
 						}
 						var rng = randomSupply.getPixelRng(l, window, ignoredColors);
-						
+						var fakeAlphaChannel = prefs("fakeAlphaChannel");
 						for (var i = 0; i < l; i += 4){
 							var [r, g, b, a] = rng(
 								xPixels[i + 0],
@@ -385,9 +386,10 @@
 							xPixels[i + 0] = r;
 							xPixels[i + 1] = g;
 							xPixels[i + 2] = b;
+							if (fakeAlphaChannel){
 								xPixels[i + 3] = a;
 							}
-						
+						}
 						return ret;
 					}
 					else {

releaseNotes.txt

@@ -18,6 +18,7 @@ Version 0.4.0:
 			* setting to not fake the most frequent colors in a canvas
 			* setting to enable canvas cache
 			* setting to hide expert settings
+			* setting to control if the alpha channel should be faked as wel
 	
 	fixes:
 		- ask mode did not work for input types