[Mesa-dev] [PATCH] swrast: Fix signed/unsigned problems with negative strides.

[Mathias Fröhlich]

Hi,

The attached patch fixes a core dump in glReadPixels with traditional swrast.
The problem looks pretty much the same like the one the VTK guy Kevin H. Hobbs 
reports. At least his backtrace is mostly the same.

Please review.

Thanks

Mathias
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