IMAGE_IO_USE_BACKGROUND = 0x40000, /* [ I ] - merge transparent pixels with background_color */
};
-void image_io_init(struct image_thread *it, struct image_io *io);
+int image_io_init(struct image_thread *it, struct image_io *io);
void image_io_cleanup(struct image_io *io);
void image_io_reset(struct image_io *io);