commit b2b183c2700d40210df51ff3ec9a2568ce9f5a43
author aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> Thu Dec 04 22:36:38 2008 +0000
committer aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> Thu Dec 04 22:36:38 2008 +0000
tree 8435d2a51180a3800ad42ac130ceb1b947b2623a
parent 4dc822d726376fd4369089f04eb8605d2f94b74f

do boundary check based on absolute value (Glauber  Costa)

For backward operations, dstpitch and srcpitch can
be negative. This leads BLTUNSAFE macro into an
overflow, and as a result, it avoids performing
operations that are perfectly valid.

The visible effect that led to that patch was the gnome-panel
bar in Fedora10. Before this patch, you could see garbage
clobbering a big portion of the bar.

After this patch, this garbage is gone.

Signed-off-by: Glauber Costa <glommer@redhat.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5880 c046a42c-6fe2-441c-8c8c-71466251a162