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268e227ba0
Use reference counting and do nothing unless the reference count transitions to/from 0. Fixes https://bugs.freedesktop.org/show_bug.cgi?id=22822 . As a bonus, this avoids calling the driver Prepare/FinishAccess hooks more than once per pixmap and operation. Also update the Doxygen documentation for the PrepareAccess driver hook to better match current reality.