enhancements: added saturate method to undo a desaturate, tweaked the reset method to allow for resetting one method at a time, all methods now reset their own state before applying

lib/ComicBook.js

@@ -181,6 +181,8 @@ function ComicBook(id, srcs, opts) {
 	 *
 	 * TODO: break this down into drawSinglePage() & drawDoublePage()?
 	 * TODO: if the current browser doesn't have canvas support, use img tags
+	 * 
+	 * @param applyEnhancements {boolean}
 	 */
 	ComicBook.prototype.drawPage = function() {
 		
@@ -265,7 +267,7 @@ function ComicBook(id, srcs, opts) {
 		
 		// apply any image enhancements previously defined
 		$.each(enhancements, function(action, options){
-			ComicBook.prototype.enhance[action](options);
+			ComicBook.prototype.enhance[action](options, false);
 		});
 	};
 	
@@ -299,15 +301,24 @@ function ComicBook(id, srcs, opts) {
 	 * Powered by the awesome Pixastic: http://www.pixastic.com/
 	 * 
 	 * TODO: reset & apply all image enhancements each time before applying new one
+	 * 
 	 * TODO: abstract this into an "Enhance" object, separate from ComicBook?
 	 */
 	ComicBook.prototype.enhance = {
 		
 		/**
-		 * Render the page with no enhancements
+		 * Reset enhancements.
+		 * This can reset a specific enhancement if the method name is passed, or
+		 * it will reset all.
+		 * 
+		 * @param method {string} the specific enhancement to reset
 		 */
-		reset: function () {
+		reset: function (method) {
+			if (!method) {
 				enhancements = {};
+			} else {
+				delete enhancements[method];
+			}
 			ComicBook.prototype.drawPage();
 		},
 		
@@ -320,7 +331,9 @@ function ComicBook(id, srcs, opts) {
 		 * 
 		 * @param {Object} options
 		 */
-		brightness: function (options) {
+		brightness: function (options, reset) {
+			
+			if (reset !== false) this.reset("brightness");
 			
 			// merge user options with defaults
 			var options = merge({ brightness: 0, contrast: 0 }, options);
@@ -347,6 +360,14 @@ function ComicBook(id, srcs, opts) {
 			init();
 		},
 		
+		/**
+		 * Undo desaturate
+		 */
+		saturate: function () {			
+			delete enhancements.desaturate;
+			ComicBook.prototype.drawPage();
+		},
+		
 		/**
 		 * Sharpen
 		 *