Better gradient handling (migration/fallbacks)

[Adam Jackson]

On Thu, 2008-11-13 at 11:16 -0800, Eric Anholt wrote:

> We just need to accelerate gradients, and is where any effort in
> software should occur.  It's on our schedule, but not for quite a while.
> Setting up the X Server to allow drivers to request gradients was easy
> last time I did it, though I've misplaced the branch it looks like.
> Then someone would just have to write the shader for it, and for
> 915-class hardware that shouldn't be hard.

One pleasant side effect of shatter is that the acceleration layer
should be able to catch rendering from source-only pictures and
magically transform them into pixel-backed pictures if it thinks that'll
be a win.  So even for hardware without the cojones to do gradients, we
should be able to do slightly better than pure software.

- ajax
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