shm: Add wl_shm_buffer ref and unref functions

Shared memory buffers are currently tied to the lifetime of their
underlying wl_buffer resource. This becomes problematic when the client
destroys the resource after committing new state which references the
wl_buffer because a compositor might have to defer applying the commit.

This commit adds methods to keep the wl_shm_buffer alive longer than the
underlying resource. This implicitly also keeps the buffer pool alive
and because the wl_shm_buffer uses offsets into the pool, it even works
when the underlying storage gets remapped somewhere else, which can
happen when the client resizes the pool.

Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>

0 files changed, 0 insertions, 0 deletions