icetImageNull -- retrieve a placeholder for an empty image.
IceTImage icetImageNull( void );
Images are created internally by the IceT library. Sometimes it is
convenient to have a placeholder for a .igimage!null``null'' image, an
image that does not and cannot hold data. Null images require no
allocated memory to function.
If your code has the potential of using an IceTImage image object that
might not otherwise be initialized, use icetImageNull to set it to a
null object. This will ensure that IceT image functions that operate on
it will behave deterministically.
A null image simply looks like an image with no pixels and has no color
buffers. icetImageGetWidth, icetImageGetHeight, and
icetImageGetNumPixels all return 0 for a null image.
icetSetColorFormatand icetSetDepthFormatreturn ICET_IMAGE_COLOR_NONE
and ICET_IMAGE_DEPTH_NONE, respectively.
You can identify a null image with the icetImageIsNull function.
A null image object.
Copyright (C)2010 Sandia Corporation
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
This source code is released under the New BSD License.
IceT Reference September 20, 2010 icetImageNull(3)