class RasterRowIO(RasterRow):
"""Raster_row_cache_access": The same as "Raster_row_access" but uses
the ROWIO library for cached row access
"""
def __init__(self, name, *args, **kargs):
self.rowio = RowIO()
super(RasterRowIO, self).__init__(name, *args, **kargs)
def open(self, mode=None, mtype=None, overwrite=False):
"""Open the raster if exist or created a new one.
:param mode: specify if the map will be open with read or write mode
('r', 'w')
:type mode: str
:param type: if a new map is open, specify the type of the map(`CELL`,
`FCELL`, `DCELL`)
:type type: str
:param overwrite: use this flag to set the overwrite mode of existing
raster maps
:type overwrite: bool
"""
super(RasterRowIO, self).open(mode, mtype, overwrite)
self.rowio.open(self._fd, self._rows, self._cols, self.mtype)
@must_be_open
def close(self):
"""Function to close the raster"""
self.rowio.release()
libraster.Rast_close(self._fd)
# update rows and cols attributes
self._rows = None
self._cols = None
self._fd = None
@must_be_open
def get_row(self, row, row_buffer=None):
"""This method returns the row using:
* the read mode and
* `rowcache` method
:param row: the number of row to obtain
:type row: int
:param row_buffer: Specify the Buffer object that will be instantiate
:type row_buffer: Buffer object
"""
if row_buffer is None:
row_buffer = Buffer((self._cols,), self.mtype)
rowio_buf = librowio.Rowio_get(ctypes.byref(self.rowio.c_rowio), row)
ctypes.memmove(row_buffer.p, rowio_buf, self.rowio.row_size)
return row_buffer
class RasterRowIO(RasterRow):
"""Raster_row_cache_access": The same as "Raster_row_access" but uses
the ROWIO library for cached row access
"""
def __init__(self, name, *args, **kargs):
self.rowio = RowIO()
super(RasterRowIO, self).__init__(name, *args, **kargs)
def open(self, mode=None, mtype=None, overwrite=False):
"""Open the raster if exist or created a new one.
:param mode: specify if the map will be open with read or write mode
('r', 'w')
:type mode: str
:param type: if a new map is open, specify the type of the map(`CELL`,
`FCELL`, `DCELL`)
:type type: str
:param overwrite: use this flag to set the overwrite mode of existing
raster maps
:type overwrite: bool
"""
super(RasterRowIO, self).open(mode, mtype, overwrite)
self.rowio.open(self._fd, self._rows, self._cols, self.mtype)
@must_be_open
def close(self):
"""Function to close the raster"""
self.rowio.release()
libraster.Rast_close(self._fd)
# update rows and cols attributes
self._rows = None
self._cols = None
self._fd = None
@must_be_open
def get_row(self, row, row_buffer=None):
"""This method returns the row using:
* the read mode and
* `rowcache` method
:param row: the number of row to obtain
:type row: int
:param row_buffer: Specify the Buffer object that will be instantiate
:type row_buffer: Buffer object
"""
if row_buffer is None:
row_buffer = Buffer((self._cols, ), self.mtype)
rowio_buf = librowio.Rowio_get(ctypes.byref(self.rowio.c_rowio), row)
ctypes.memmove(row_buffer.p, rowio_buf, self.rowio.row_size)
return row_buffer
def __init__(self, name, *args, **kargs):
self.rowio = RowIO()
super(RasterRowIO, self).__init__(name, *args, **kargs)
def __init__(self, name, *args, **kargs):
self.rowio = RowIO()
super(RasterRowIO, self).__init__(name, *args, **kargs)
