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shm: Add wl_shm_buffer ref and unref functions

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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>
This commit is contained in:
Sebastian Wick 2025-03-21 19:42:52 +01:00
parent af453f876e
commit 9367c4da76
2 changed files with 79 additions and 5 deletions
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6
src/wayland-server-core.h
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@ -666,6 +666,12 @@ wl_shm_buffer_get_width(const struct wl_shm_buffer *buffer);
int32_t
wl_shm_buffer_get_height(const struct wl_shm_buffer *buffer);
struct wl_shm_buffer *
wl_shm_buffer_ref(struct wl_shm_buffer *buffer);
void
wl_shm_buffer_unref(struct wl_shm_buffer *buffer);
struct wl_shm_pool *
wl_shm_buffer_ref_pool(struct wl_shm_buffer *buffer);