typedef struct im_context_tag *im_context_t;
+typedef ptrdiff_t im_slot_t;
+typedef void (*im_slot_destroy_t)(void *);
+
/* used for palette indices in some internal code (which might be
exposed at some point
*/
*/
typedef ptrdiff_t i_img_dim;
+typedef size_t i_img_dim_u;
/*
=item i_color