def request( self, slicing, through=None ):
assert is_pure_slicing(slicing)
assert is_bounded(slicing)
shape = slicing2shape(slicing)
result = np.zeros( shape, dtype = self._dtype )
result[:] = self._constant
return ConstantRequest( result )
def request(self, slicing, through=None):
assert is_pure_slicing(slicing)
assert is_bounded(slicing)
shape = slicing2shape(slicing)
result = np.zeros(shape, dtype=self._dtype)
result[:] = self._constant
return ConstantRequest(result)
def request(self, slicing):
assert is_pure_slicing(slicing)
assert is_bounded(slicing)
shape = slicing2shape(slicing)
key = (shape, self._constant, self._dtype)
if key not in self._cache:
result = np.full(shape, self._constant, dtype=self._dtype)
result.setflags(write=False)
self._cache[key] = result
return ConstantRequest(self._cache[key])
def setDirty(self, slicing):
"""Mark a region of the image as dirty.
slicing -- if one ore more slices in the slicing
are unbounded, the whole image is marked dirty;
since an image has two dimensions, only the first
two slices in the slicing are used
"""
if not is_pure_slicing(slicing):
raise Exception("dirty region: slicing is not pure")
if not is_bounded(slicing):
self.isDirty.emit(QRect()) # empty rect == everything is dirty
else:
self.isDirty.emit(slicing2rect(slicing))
def setDirty( self, slicing ):
'''Mark a region of the image as dirty.
slicing -- if one ore more slices in the slicing
are unbounded, the whole image is marked dirty;
since an image has two dimensions, only the first
two slices in the slicing are used
'''
if not is_pure_slicing(slicing):
raise Exception('dirty region: slicing is not pure')
if not is_bounded( slicing ):
self.isDirty.emit(QRect()) # empty rect == everything is dirty
else:
self.isDirty.emit(slicing2rect( slicing ))