[Openexr-devel] exr shake plugin bug

[Ken McGaugh]

Hey all, I came across a bug in the sample sdk format
plugin for shake which affects any file format translators
derived from that code.  The bug is that if the frame you
are rendering has a DOD completely outside the view no
output file is created.

Apple sent me a fix I'd like to pass along since it affects
the OpenEXR format translator.  In the writer's constructor
change dependency logic for the pOut->roi() plug to look like

     pOut->roi()->addDependencies(
         pOut->width(),
         pOut->height(),
         0
         );

Then in the eval() function modify the pOut->roi() logic to
look like

        else if (p == pOut->roi())
        {
            iRoi.X1 = 0;
            iRoi.X2 = pOut->width()->asInt();
            iRoi.Y1 = 0;
            iRoi.Y2 = pOut->height()->asInt();

            p->set(&iRoi);
        }

Note that I think the OpenEXR translator will still break in this
situation since it will be passed an empty dataWindow.  In our
translator we have to catch that situation explicitly and output
a 1 black pixel dataWindow.

--Ken