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transactions-v1: new protocol implementation

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This implements the transactions-unstable-v1 protocol [1]. The protocol
allows clients to synchronize multiple surfaces together and ensure
their commits are applied atomically.

[1]: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/26
This commit is contained in:
Simon Ser 2021-03-22 22:21:38 +01:00
parent b89bcffea4
commit bbec5a0a93
4 changed files with 199 additions and 0 deletions
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1
types/meson.build
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@ -59,6 +59,7 @@ wlr_files += files(
'wlr_tablet_tool.c',
'wlr_text_input_v3.c',
'wlr_touch.c',
'wlr_transactions_v1.c',
'wlr_viewporter.c',
'wlr_virtual_keyboard_v1.c',
'wlr_virtual_pointer_v1.c',

156
types/wlr_transactions_v1.c Normal file
View file

@ -0,0 +1,156 @@
#include <assert.h>
#include <stdlib.h>
#include <wlr/types/wlr_surface.h>
#include <wlr/types/wlr_transactions_v1.h>
#include "transactions-unstable-v1-protocol.h"
#define TRANSACTION_MANAGER_V1_VERSION 1
static const struct zwp_transaction_v1_interface transaction_impl;
static struct wlr_transaction_v1 *transaction_from_resource(
struct wl_resource *resource) {
assert(wl_resource_instance_of(resource,
&zwp_transaction_v1_interface, &transaction_impl));
return wl_resource_get_user_data(resource);
}
static void transaction_surface_destroy(
struct wlr_transaction_v1_surface *transaction_surface) {
if (transaction_surface == NULL) {
return;
}
wl_list_remove(&transaction_surface->surface_destroy.link);
wl_list_remove(&transaction_surface->link);
free(transaction_surface);
}
static void transaction_handle_resource_destroy(struct wl_resource *resource) {
struct wlr_transaction_v1 *transaction =
transaction_from_resource(resource);
struct wlr_transaction_v1_surface *transaction_surface, *tmp;
wl_list_for_each_safe(transaction_surface, tmp, &transaction->surfaces, link) {
wlr_surface_unlock_cached(transaction_surface->surface,
transaction_surface->cached_state_seq);
transaction_surface_destroy(transaction_surface);
}
free(transaction);
}
static void transaction_surface_handle_surface_destroy(
struct wl_listener *listener, void *data) {
struct wlr_transaction_v1_surface *transaction_surface =
wl_container_of(listener, transaction_surface, surface_destroy);
transaction_surface_destroy(transaction_surface);
}
static void transaction_handle_add_surface(struct wl_client *client,
struct wl_resource *transaction_resource,
struct wl_resource *surface_resource) {
struct wlr_transaction_v1 *transaction =
transaction_from_resource(transaction_resource);
struct wlr_surface *surface = wlr_surface_from_resource(surface_resource);
struct wlr_transaction_v1_surface *transaction_surface =
calloc(1, sizeof(*transaction_surface));
if (transaction_surface == NULL) {
wl_resource_post_no_memory(transaction_resource);
return;
}
transaction_surface->surface = surface;
transaction_surface->cached_state_seq = wlr_surface_lock_pending(surface);
transaction_surface->surface_destroy.notify = transaction_surface_handle_surface_destroy;
wl_signal_add(&surface->events.destroy, &transaction_surface->surface_destroy);
wl_list_insert(&transaction->surfaces, &transaction_surface->link);
}
static void transaction_handle_commit(struct wl_client *client,
struct wl_resource *transaction_resource) {
// The resource destroy handler will release surface locks
wl_resource_destroy(transaction_resource);
}
static const struct zwp_transaction_v1_interface transaction_impl = {
.add_surface = transaction_handle_add_surface,
.commit = transaction_handle_commit,
};
static void manager_handle_create_transaction(struct wl_client *client,
struct wl_resource *manager_resource, uint32_t id) {
struct wlr_transaction_v1 *transaction = calloc(1, sizeof(*transaction));
if (transaction == NULL) {
wl_resource_post_no_memory(manager_resource);
return;
}
wl_list_init(&transaction->surfaces);
uint32_t version = wl_resource_get_version(manager_resource);
transaction->resource = wl_resource_create(client,
&zwp_transaction_v1_interface, version, id);
if (transaction->resource == NULL) {
wl_resource_post_no_memory(manager_resource);
free(transaction);
return;
}
wl_resource_set_implementation(transaction->resource, &transaction_impl,
transaction, transaction_handle_resource_destroy);
}
static void manager_handle_destroy(struct wl_client *client,
struct wl_resource *manager_resource) {
wl_resource_destroy(manager_resource);
}
static const struct zwp_transaction_manager_v1_interface manager_impl = {
.destroy = manager_handle_destroy,
.create_transaction = manager_handle_create_transaction,
};
static void manager_bind(struct wl_client *client, void *data,
uint32_t version, uint32_t id) {
struct wlr_transaction_manager_v1 *manager = data;
struct wl_resource *resource = wl_resource_create(client,
&zwp_transaction_manager_v1_interface, version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource, &manager_impl, manager, NULL);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_transaction_manager_v1 *manager =
wl_container_of(listener, manager, display_destroy);
wl_global_destroy(manager->global);
wl_list_remove(&manager->display_destroy.link);
free(manager);
}
struct wlr_transaction_manager_v1 *wlr_transaction_manager_v1_create(
struct wl_display *display) {
struct wlr_transaction_manager_v1 *manager = calloc(1, sizeof(*manager));
if (manager == NULL) {
return NULL;
}
manager->global = wl_global_create(display,
&zwp_transaction_manager_v1_interface, TRANSACTION_MANAGER_V1_VERSION,
manager, manager_bind);
if (manager->global == NULL) {
free(manager);
return NULL;
}
manager->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &manager->display_destroy);
return manager;
}