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9a2d99e28a
and lifetime issues of dynamically allocated Py_buffer members (#9990) as well as crashes (#8305, #7433). Many new features have been added (See whatsnew/3.3), and the documentation has been updated extensively. The ndarray test object from _testbuffer.c implements all aspects of PEP-3118, so further development towards the complete implementation of the PEP can proceed in a test-driven manner. Thanks to Nick Coghlan, Antoine Pitrou and Pauli Virtanen for review and many ideas. - Issue #12834: Fix incorrect results of memoryview.tobytes() for non-contiguous arrays. - Issue #5231: Introduce memoryview.cast() method that allows changing format and shape without making a copy of the underlying memory.
73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
/* Memory view object. In Python this is available as "memoryview". */
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#ifndef Py_MEMORYOBJECT_H
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#define Py_MEMORYOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_LIMITED_API
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PyAPI_DATA(PyTypeObject) _PyManagedBuffer_Type;
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#endif
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PyAPI_DATA(PyTypeObject) PyMemoryView_Type;
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#define PyMemoryView_Check(op) (Py_TYPE(op) == &PyMemoryView_Type)
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#ifndef Py_LIMITED_API
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/* Get a pointer to the memoryview's private copy of the exporter's buffer. */
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#define PyMemoryView_GET_BUFFER(op) (&((PyMemoryViewObject *)(op))->view)
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/* Get a pointer to the exporting object (this may be NULL!). */
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#define PyMemoryView_GET_BASE(op) (((PyMemoryViewObject *)(op))->view.obj)
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#endif
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PyAPI_FUNC(PyObject *) PyMemoryView_FromObject(PyObject *base);
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PyAPI_FUNC(PyObject *) PyMemoryView_FromMemory(char *mem, Py_ssize_t size,
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int flags);
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#ifndef Py_LIMITED_API
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PyAPI_FUNC(PyObject *) PyMemoryView_FromBuffer(Py_buffer *info);
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#endif
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PyAPI_FUNC(PyObject *) PyMemoryView_GetContiguous(PyObject *base,
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int buffertype,
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char order);
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/* The structs are declared here so that macros can work, but they shouldn't
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be considered public. Don't access their fields directly, use the macros
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and functions instead! */
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#ifndef Py_LIMITED_API
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#define _Py_MANAGED_BUFFER_RELEASED 0x001 /* access to exporter blocked */
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#define _Py_MANAGED_BUFFER_FREE_FORMAT 0x002 /* free format */
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typedef struct {
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PyObject_HEAD
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int flags; /* state flags */
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Py_ssize_t exports; /* number of direct memoryview exports */
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Py_buffer master; /* snapshot buffer obtained from the original exporter */
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} _PyManagedBufferObject;
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/* static storage used for casting between formats */
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#define _Py_MEMORYVIEW_MAX_FORMAT 3 /* must be >= 3 */
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/* memoryview state flags */
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#define _Py_MEMORYVIEW_RELEASED 0x001 /* access to master buffer blocked */
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#define _Py_MEMORYVIEW_C 0x002 /* C-contiguous layout */
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#define _Py_MEMORYVIEW_FORTRAN 0x004 /* Fortran contiguous layout */
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#define _Py_MEMORYVIEW_SCALAR 0x008 /* scalar: ndim = 0 */
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#define _Py_MEMORYVIEW_PIL 0x010 /* PIL-style layout */
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typedef struct {
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PyObject_VAR_HEAD
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_PyManagedBufferObject *mbuf; /* managed buffer */
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Py_hash_t hash; /* hash value for read-only views */
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int flags; /* state flags */
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Py_ssize_t exports; /* number of buffer re-exports */
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Py_buffer view; /* private copy of the exporter's view */
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char format[_Py_MEMORYVIEW_MAX_FORMAT]; /* used for casting */
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Py_ssize_t ob_array[1]; /* shape, strides, suboffsets */
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} PyMemoryViewObject;
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_MEMORYOBJECT_H */
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