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buffer: re-use wlr_shm_client_buffer

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The first time wlr_buffer_from_resource is called with a wl_buffer
resource that originates from wl_shm, create a new
wlr_shm_client_buffer as usual. If wlr_buffer_from_resource is called
multiple times, re-use the existing wlr_shm_client_buffer.

This commit changes how the wlr_shm_client_buffer lifetime is managed:
previously it was destroyed as soon as the wlr_buffer was released.
With this commit it's destroyed when the wl_buffer resource is.

Apart from de-duplicating wlr_shm_client_buffer creations, this allows
to easily track when a wlr_shm_client_buffer is re-used. This is useful
for the renderer and the backends, e.g. the Pixman renderer can keep
using the same Pixman image if the buffer is re-used. In the future,
this will also allow to re-use resources in the Wayland and X11 backends
(remote wl_buffer objects for Wayland, pixmaps for X11).
This commit is contained in:
Simon Ser 2021-07-19 19:04:38 +02:00 • committed by Simon Zeni
parent f94eb174c7
commit 8afb4d8bf0
2 changed files with 16 additions and 8 deletions
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3
include/types/wlr_buffer.h
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@ -22,9 +22,6 @@ struct wlr_shm_client_buffer {
struct wl_listener release;
};
struct wlr_shm_client_buffer *shm_client_buffer_create(
struct wl_resource *resource);
/**
* A read-only buffer that holds a data pointer.
*