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/*
 * Get the current image (Imlib2::Image).
 *
 * Note that this function is not useful at the moment since all image
 * instance methods blindly blow away the image and color context.  So
 * you cannot safely mix image context and image instance methods.
 *
 * Example:
 *   im = ctx.image
 *
 */
static VALUE ctx_image(VALUE self) {