what is the purpose of GeodeCalculatePitchBytes function?

[Adam Jackson]

On Wed, 2010-09-08 at 17:18 +0800, Cui, Hunk wrote:
> Hi, all,
> 
> 	Ask one question...
> 	In
> http://cgit.freedesktop.org/xorg/driver/xf86-video-geode/tree/src/gx_dri
> ver.c#n1560, this is the function " GeodeCalculatePitchBytes", in the
> process of calculate the pitch, why does the compression require a power
> of 2, what is the purpose? 

Framebuffer compression is a hardware feature.  If the hardware requires
a power-of-two pitch...

- ajax
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