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Create screenshots of (almost) arbitary size

Christos Tsolakis requested to merge christos.tsolakis/vtk:offscreen-screenshots into master

The current vtkWindowToImageFilter can only save screenshots with the same aspect ratio as the input window.

This Merge Request creates a new filter that can create screenshots of any size independent of the size of the input window. The only restriction is the available memory.

To allow for even bigger image sizes we switch to tilling when the size exceeds a specified size (configurable).

Edited by Christos Tsolakis

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