create a canvas image editor

Hey I need a tool somehow similar with the one here, but built with javascript on a canvas, has to work on ipad too. [login to view URL] i dont need : - webcam photo - the design can be different from the one here.. can be something simpler what I need - i have to add as many categories as I want (eyes, mouth, mustache, etc) - add as many items in each category - scale, rotate, alpha for each item I add in the scene - contrast, saturation, color - save the image as png and upload to server - I can change the canvas size - reorder, delete layers in the scene - add custom images to the scene (user can upload an image and add it to the scene as a layer) If possible I want it built with [login to view URL], but I'm opened to other solutions. Thanks