A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
This patch implements the blur node for the realtime compositor. The patch is
still missing the Variable Size option because it depends on the Erode/Dilate
node, which is yet to be implemented. Furthermore, there are a number of
optimizations that can be implemented, the most important of which is the IIR
implementation of the Fast Gaussian filter, as well as the use of hardware
filtering and thread local memory. The latter of which was attempted but was
not robust enough, so it will be submitted as separate patch.
Differential Revision: https://developer.blender.org/D15663
Reviewed By: Clement Foucault
