diff options
| -rw-r--r-- | py/obj.h | 41 |
1 files changed, 41 insertions, 0 deletions
@@ -76,6 +76,41 @@ typedef struct _mp_method_t { mp_const_obj_t fun; } mp_method_t; +// Buffer protocol +typedef struct _buffer_info_t { + // if we'd bother to support various versions of structure + // (with different number of fields), we can distinguish + // them with ver = sizeof(struct). Cons: overkill for *micro*? + //int ver; // ? + + void *buf; + machine_int_t len; + + // Rationale: have array.array and have SIMD operations on them + // Cons: users can pass item size to processing functions themselves, + // though that's not "plug&play" + // int itemsize; + + // Rationale: to load arbitrary-sized sprites directly to LCD + // Cons: a bit adhoc usecase + // int stride; +} buffer_info_t; +#define BUFFER_READ (1) +#define BUFFER_WRITE (2) +#define BUFFER_RW (BUFFER_READ | BUFFER_WRITE) +typedef struct _mp_buffer_p_t { + machine_int_t (*get_buffer)(mp_obj_t obj, buffer_info_t *bufinfo, int flags); +} mp_buffer_p_t; + +// Stream protocol +typedef struct _mp_stream_p_t { + // On error, functions should return -1 and fill in *errcode (values are + // implementation-dependent, but will be exposed to user, e.g. via exception). + machine_int_t (*read)(mp_obj_t obj, void *buf, machine_uint_t size, int *errcode); + machine_int_t (*write)(mp_obj_t obj, const void *buf, machine_uint_t size, int *errcode); + // add seek() ? +} mp_stream_p_t; + struct _mp_obj_type_t { mp_obj_base_t base; const char *name; @@ -90,6 +125,12 @@ struct _mp_obj_type_t { mp_fun_1_t getiter; mp_fun_1_t iternext; + // Alternatively, pointer(s) to interfaces to save space + // in mp_obj_type_t at the expense of extra pointer and extra dereference + // when actually used. + mp_buffer_p_t buffer_p; + mp_stream_p_t stream_p; + const mp_method_t *methods; /* |