
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
Read the documentation in qemu-doc.html. Fabrice Bellard.
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