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presentation-time: add helper for common case

Browse source 
Most of the time, compositors just display the surface's current buffer
on an output. Add an helper to make it easy to support presentation-time
in this case.
This commit is contained in:
Simon Ser 2019-11-17 00:20:26 +01:00 committed by Drew DeVault
parent 533ea6d7ef
commit 2122e49bea
2 changed files with 111 additions and 0 deletions
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30
include/wlr/types/wlr_presentation_time.h
View file

@ -14,6 +14,9 @@
#include <time.h>
#include <wayland-server-core.h>
struct wlr_output;
struct wlr_output_event_present;
struct wlr_presentation {
struct wl_global *global;
struct wl_list resources; // wl_resource_get_link
@ -42,8 +45,17 @@ struct wlr_presentation_feedback {
bool sampled;
bool presented;
// Only when the wlr_presentation_surface_sampled_on_output helper has been
// called
struct wlr_output *output;
bool output_committed;
uint32_t output_commit_seq;
struct wl_listener surface_commit;
struct wl_listener surface_destroy;
struct wl_listener output_commit;
struct wl_listener output_present;
struct wl_listener output_destroy;
};
struct wlr_presentation_event {
@ -81,4 +93,22 @@ void wlr_presentation_feedback_send_presented(
void wlr_presentation_feedback_destroy(
struct wlr_presentation_feedback *feedback);
/**
* Fill a wlr_presentation_event from a wlr_output_event_present.
*/
void wlr_presentation_event_from_output(struct wlr_presentation_event *event,
const struct wlr_output_event_present *output_event);
/**
* Mark the current surface's buffer as sampled on the given output.
*
* Instead of calling wlr_presentation_surface_sampled and managing the
* wlr_presentation_feedback itself, the compositor can call this function
* before a wlr_output_commit call to indicate that the surface's current
* contents will be displayed on the output.
*/
void wlr_presentation_surface_sampled_on_output(
struct wlr_presentation *presentation, struct wlr_surface *surface,
struct wlr_output *output);
#endif

81
types/wlr_presentation_time.c
View file

@ -1,6 +1,7 @@
#define _POSIX_C_SOURCE 199309L
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <wlr/types/wlr_presentation_time.h>
#include <wlr/types/wlr_surface.h>
#include <wlr/backend.h>
@ -250,6 +251,8 @@ struct wlr_presentation_feedback *wlr_presentation_surface_sampled(
return NULL;
}
static void feedback_unset_output(struct wlr_presentation_feedback *feedback);
void wlr_presentation_feedback_destroy(
struct wlr_presentation_feedback *feedback) {
if (feedback == NULL) {
@ -265,6 +268,84 @@ void wlr_presentation_feedback_destroy(
assert(wl_list_empty(&feedback->resources));
feedback_unset_surface(feedback);
feedback_unset_output(feedback);
wl_list_remove(&feedback->link);
free(feedback);
}
void wlr_presentation_event_from_output(struct wlr_presentation_event *event,
const struct wlr_output_event_present *output_event) {
memset(event, 0, sizeof(*event));
event->output = output_event->output;
event->tv_sec = (uint64_t)output_event->when->tv_sec;
event->tv_nsec = (uint32_t)output_event->when->tv_nsec;
event->refresh = (uint32_t)output_event->refresh;
event->seq = (uint64_t)output_event->seq;
event->flags = output_event->flags;
}
static void feedback_unset_output(struct wlr_presentation_feedback *feedback) {
if (feedback->output == NULL) {
return;
}
feedback->output = NULL;
wl_list_remove(&feedback->output_commit.link);
wl_list_remove(&feedback->output_present.link);
wl_list_remove(&feedback->output_destroy.link);
}
static void feedback_handle_output_commit(struct wl_listener *listener,
void *data) {
struct wlr_presentation_feedback *feedback =
wl_container_of(listener, feedback, output_commit);
if (feedback->output_committed) {
return;
}
feedback->output_committed = true;
feedback->output_commit_seq = feedback->output->commit_seq;
}
static void feedback_handle_output_present(struct wl_listener *listener,
void *data) {
struct wlr_presentation_feedback *feedback =
wl_container_of(listener, feedback, output_present);
struct wlr_output_event_present *output_event = data;
if (!feedback->output_committed ||
output_event->commit_seq != feedback->output_commit_seq) {
return;
}
struct wlr_presentation_event event = {0};
wlr_presentation_event_from_output(&event, output_event);
wlr_presentation_feedback_send_presented(feedback, &event);
wlr_presentation_feedback_destroy(feedback);
}
static void feedback_handle_output_destroy(struct wl_listener *listener,
void *data) {
struct wlr_presentation_feedback *feedback =
wl_container_of(listener, feedback, output_destroy);
wlr_presentation_feedback_destroy(feedback);
}
void wlr_presentation_surface_sampled_on_output(
struct wlr_presentation *presentation, struct wlr_surface *surface,
struct wlr_output *output) {
struct wlr_presentation_feedback *feedback =
wlr_presentation_surface_sampled(presentation, surface);
if (feedback == NULL) {
return;
}
assert(feedback->output == NULL);
feedback->output = output;
feedback->output_commit.notify = feedback_handle_output_commit;
wl_signal_add(&output->events.commit, &feedback->output_commit);
feedback->output_present.notify = feedback_handle_output_present;
wl_signal_add(&output->events.present, &feedback->output_present);
feedback->output_destroy.notify = feedback_handle_output_destroy;
wl_signal_add(&output->events.destroy, &feedback->output_destroy);
}