[vtkusers] Problem in vtkFreeTypeStringToImage::GetBounds

[nclemeur]

Hello,

I have noticed that the local variable "int tmp[4];" in the methods
vtkFreeTypeStringToImage::GetBounds should be initialised to values of 0.
Indeed, the later call to GetBoundingBox is not populating that variable
when the string is empty.

This manifest it-self on by an empty chart since the calculation of the axis
size is completely wrong.

I am seeing this problem on Linux using a quite recent version of vtk trunk
linked with Mesa.

Please let me know if you requires further details.

Cheers

Nicolas

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