[PATCH] fb: fix fast-path detection

[Adam Jackson]

On Mon, 2014-03-24 at 15:29 +0800, Daniel Kurtz wrote:

> This bug causes us to take the slow path for large non-overlapping rows
> that are "close" in memory.  As a data point, XGetImage(1366x768) on my
> ARM chromebook was taking ~140 ms, but with this fixed, it now takes
> about 60 ms.
>  XGetImage() -> exaGetImage() -> fbGetImage -> fbBlt()

Nice catch.

Reviewed-by: Adam Jackson <ajax at redhat.com>

- ajax