[PATCH xserver] Make PixmapDirtyUpdateRec::src a DrawablePtr

[Adam Jackson]

On Tue, 2017-04-18 at 19:07 +0900, Michel Dänzer wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
> 
> This allows making the master screen's pixmap_dirty_list entries
> explicitly reflect that we're now tracking the root window instead of
> the screen pixmap, in order to allow Present page flipping on master
> outputs while there are active slave outputs.
> 
> Define HAS_DIRTYTRACKING_DRAWABLE_SRC for drivers to check, but leave
> HAS_DIRTYTRACKING_ROTATION defined as well to make things slightly
> easier for drivers.
> 
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

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

- ajax