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buffer: introduce wlr_shm_client_buffer

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Introduce wlr_shm_client_buffer, which provides a wlr_buffer wrapper
around wl_shm_buffer.

Because the client can destroy the wl_buffer while we still are using
it, we need to do some libwayland tricks to still be able to continue
accessing its underlying storage. We need to reference the wl_shm_pool
and save the data pointer.
This commit is contained in:
Simon Ser 2021-04-14 19:11:35 +02:00 • committed by Simon Zeni
parent 625c66ef75
commit 7c26345826
2 changed files with 125 additions and 0 deletions
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22
include/types/wlr_buffer.h
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@ -3,6 +3,28 @@
#include <wlr/types/wlr_buffer.h>
struct wlr_shm_client_buffer {
struct wlr_buffer base;
uint32_t format;
size_t stride;
// The following fields are NULL if the client has destroyed the wl_buffer
struct wl_resource *resource;
struct wl_shm_buffer *shm_buffer;
// This is used to keep the backing storage alive after the client has
// destroyed the wl_buffer
struct wl_shm_pool *saved_shm_pool;
void *saved_data;
struct wl_listener resource_destroy;
struct wl_listener release;
};
struct wlr_shm_client_buffer *shm_client_buffer_create(
struct wl_resource *resource);
/**
* Buffer capabilities.
*