Suggestions to make it more awesome

[dfmiller]

• Instead of using window.floodfill, attach to context:

        CanvasRenderingContext2D.prototype.floodfill = function(x, y, fillColor) {
            floodfill(x, y, fillColor, this)
        }

• Allow fillcolor to be in other formats other than {r:255,g:0,b:0,a:1}: eg: "rgba(255,0,0,1)", [255,0,0,1], "red" (window.getComputedStyle can convert colors)
• Change the order of the arguments, moving tolerance before width and height.
• Since you can specify the width and height it should also allow you to specify a left and right. This would force the floodfill to be constrained to the given area.

[binarymax]

• It's an interesting suggestion, but I am usually not a fan of extending the prototype of native methods. Also, though I haven't stated it anywhere, I am actually planning on making this independent of a CanvasRenderingContext2D, and using UInt8ClampedArrays instead with an optional method for use of a context.
• Good suggestion on the color. I will incorporate this
• Argument order was already planned (to also include your last suggestion of allowing specificity of all boundaries). It will be a breaking change for 2.0.

Care to help with any of these and make a pull request? :)

[dfmiller]

Thanks for the update! Works great.