[PATCH 23/36] randr: add initial scanout pixmap support (v2)

[Keith Packard]

Dave Airlie <airlied at gmail.com> writes:

> From: Dave Airlie <airlied at redhat.com>
>
> When randr notices a crtc configuration request for a slave device,
> it checks if the slave allocated pixmap exists and is suitable,
> if not it allocates a new shared pixmap from the master, shares
> it to the slave, and starts the master tracking damage to it,
> to keep it updated from the current front pixmap.
>
> If the resize means the crtc is no longer used it will destroy
> the slave pixmap.
>
> This adds the concept of a scanout_pixmap to the randr_crtc object,
> and also adds a master pixmap pointer to the pixmap object, along
> with defining some pixmap helper functions for getting pixmap
> box/regions.

I'd rather store the master pixmap somewhere else; it looks like you
could stick it in the crtc pretty easily, right next to the
scanout_pixmap member.

Otherwise, this looks good to me.

-- 
keith.packard at intel.com
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