[cairo] [PATCH] gl: fix the same surface bug and cairo_glx_surface_t source surface bug

[Chuanbo Weng]

It's frequently used in subsurface.
I think it's neccessary to solve the problem in subsurface.
It must be one of reasons why most subsurface cases
fail.
2012/1/12 Chris Wilson <chris at chris-wilson.co.uk>

> On Thu, 12 Jan 2012 00:23:11 +0800, Chuanbo Weng <strgnm at gmail.com> wrote:
> > So we are going to support operation such as self-copy in
> > gl backend, right?
>
> Indeed, I just want a few moments reflection on the rammifactions of
> going down this path...
> (Usually it is the hordes of angry users spotting a slowdown...)
>  -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
>
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