static void encode_page_composition( encoder_t *, bs_t *, subpicture_t * );
static void encode_clut( encoder_t *, bs_t *, subpicture_t * );
static void encode_region_composition( encoder_t *, bs_t *, subpicture_t * );
static void encode_page_composition( encoder_t *, bs_t *, subpicture_t * );
static void encode_clut( encoder_t *, bs_t *, subpicture_t * );
static void encode_region_composition( encoder_t *, bs_t *, subpicture_t * );