Ensure that a canvas is always backed by some form of SkDevice.

    }

    static SkCanvas* initRaster(JNIEnv* env, jobject, SkBitmap* bitmap) {

        return bitmap ? new SkCanvas(*bitmap) : new SkCanvas;

        if (bitmap) {

            return new SkCanvas(*bitmap);

        } else {

            // Create an empty bitmap device to prevent callers from crashing

            // if they attempt to draw into this canvas.

            SkBitmap emptyBitmap;

            return new SkCanvas(emptyBitmap);

        }

    }

    static void copyCanvasState(JNIEnv* env, jobject clazz,