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In order to prevent a race between concurrent destroy and use in another
thread, we need to acquire a reference to the snapshot->target under a
mutex. Whilst we hold that reference, it prevents the internal destroy
mechanism from freeing the memory we are using (if we have a pointer to
the original surface) and the client drops their final reference.
Oh boy, talk about opening a can of worms...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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References: https://bugs.freedesktop.org/show_bug.cgi?id=48577
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Fixes record-* after the recent overhaul.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Fixes 'xlib-expose-event' but triggers an infinite loop in self-copy.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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I updated the Free Software Foundation address using the following script.
for i in $(git grep Temple | cut -d: -f1 )
do
sed -e 's/59 Temple Place[, -]* Suite 330, Boston, MA *02111-1307[, ]* USA/51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA/' -i "$i"
done
Fixes http://bugs.freedesktop.org/show_bug.cgi?id=21356
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The first iteration of COW snapshotting always made an initial copy when
the snapshot was requested (and reused that copy until the surface was
modified). However, in a few circumstances we can avoid even that copy
so long as the surface is still alive and unmodified between the
snapshotting and its use. In order to do so, we need a new proxy surface
that can automatically perform the copy if the target should disappear
prior to use.
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