PyObject*
PyImaging_MapBuffer(PyObject* self, PyObject* args)
{
int y, size;
Imaging im;
PyObject* target;
Py_buffer view;
char* mode;
char* codec;
PyObject* bbox;
int offset;
int xsize, ysize;
int stride;
int ystep;
if (!PyArg_ParseTuple(args, "O(ii)sOi(sii)", &target, &xsize, &ysize,
&codec, &bbox, &offset, &mode, &stride, &ystep))
return NULL;
if (!PyImaging_CheckBuffer(target)) {
PyErr_SetString(PyExc_TypeError, "expected string or buffer");
return NULL;
}
if (stride <= 0) {
if (!strcmp(mode, "L") || !strcmp(mode, "P"))
stride = xsize;
else if (!strncmp(mode, "I;16", 4))
stride = xsize * 2;
else
stride = xsize * 4;
}
size = ysize * stride;
/* check buffer size */
if (PyImaging_GetBuffer(target, &view) < 0)
return NULL;
if (view.len < 0) {
PyErr_SetString(PyExc_ValueError, "buffer has negative size");
return NULL;
}
if (offset + size > view.len) {
PyErr_SetString(PyExc_ValueError, "buffer is not large enough");
return NULL;
}
im = ImagingNewPrologueSubtype(
mode, xsize, ysize, sizeof(ImagingBufferInstance)
);
if (!im)
return NULL;
/* setup file pointers */
if (ystep > 0)
for (y = 0; y < ysize; y++)
im->image[y] = (char*)view.buf + offset + y * stride;
else
for (y = 0; y < ysize; y++)
im->image[ysize-y-1] = (char*)view.buf + offset + y * stride;
im->destroy = mapping_destroy_buffer;
Py_INCREF(target);
((ImagingBufferInstance*) im)->target = target;
((ImagingBufferInstance*) im)->view = view;
if (!ImagingNewEpilogue(im))
return NULL;
return PyImagingNew(im);
}
Imaging
ImagingNewPrologue(const char *mode, int xsize, int ysize)
{
return ImagingNewPrologueSubtype(
mode, xsize, ysize, sizeof(struct ImagingMemoryInstance));
}
