[PATCH] fb: Use an indirect reference to the Screen Pixmap

[Dave Airlie]

On Wed, Mar 23, 2011 at 9:40 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> In an uncomposited Display, every window renders directly onto a
> clipped region of the Screen Pixmap. Currently every Window therefore
> has a pointer to the Screen Pixmap as its WindowPrivate. However, this
> direct reference prevents the propagation of the driver changing the
> Screen Pixmap - every Window still holds a pointer to the old Screen
> Pixmap!

Why does the driver change the ScreenPixmap ptr? surely it would be
just ModifyPixmapHeader
or swapping the backing bo, or did I miss something in the explaination?

Dave.