[Mesa-dev] [PATCH] mesa: Use signed math for possibly negative values

[Adam Jackson]

On Thu, 2011-05-19 at 14:13 +0200, Ian Romanick wrote:
> From: Ian Romanick <ian.d.romanick at intel.com>
> 
> Since RowStride might be negative, we want a signed result.  On 64-bit
> platforms, an unsigned 32-bit result added to a 64-bit pointer will
> give the wrong answer.

Hah, saw this just as I sent my patch.  Let's hear it for communication.

This is less intrusive than mine, but I think mine's preferable, unless
we're sure all other users of _mesa_get_format_bytes() are correct.

- ajax
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