Distinguish the 3 different methods for acquiring pixel color values (executePixel, executePixelSampled, executePixelFiltered).
This makes it easier to keep track of the different sampling methods (and works nicer with IDEs that do code parsing).
Differential Revision: http://developer.blender.org/D7
for a color combine (mix) node with render resolution at 100%
Seems to be that the MaskNode has been created as a complex node. But no
complex features were used. Converted the execute pixel to simple
execution. And it sees that the crash does not happen.
Not sure if it is the issue is solved. I am going to let the user retest
with this revision.
This creates a list of splines to be rasterized in nitExecution which
is being called from main thread. This should resolve possible threading
issues discovered in tomato branch.
