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output: introduce wlr_output_event_commit

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This event contains a `committed` bitfield, which allows callers to know
which output fields changed during the commit.

This allows users to setup a single atomic commit listener, instead of
setting up one listener for each event (mode, scale, transform, and so
on).

References: https://github.com/swaywm/wlroots/issues/2098
This commit is contained in:
Simon Ser 2020-07-02 17:22:38 +02:00 committed by Drew DeVault
parent 6949d0fd38
commit c674241ec0
2 changed files with 13 additions and 4 deletions
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7
include/wlr/types/wlr_output.h
View file

@ -163,7 +163,7 @@ struct wlr_output {
// Emitted right before commit
struct wl_signal precommit; // wlr_output_event_precommit
// Emitted right after commit
struct wl_signal commit;
struct wl_signal commit; // wlr_output_event_commit
// Emitted right after the buffer has been presented to the user
struct wl_signal present; // wlr_output_event_present
struct wl_signal enable;
@ -198,6 +198,11 @@ struct wlr_output_event_precommit {
struct timespec *when;
};
struct wlr_output_event_commit {
struct wlr_output *output;
uint32_t committed; // bitmask of enum wlr_output_state_field
};
enum wlr_output_present_flag {
// The presentation was synchronized to the "vertical retrace" by the
// display hardware such that tearing does not happen.

10
types/wlr_output.c
View file

@ -581,11 +581,11 @@ bool wlr_output_commit(struct wlr_output *output) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
struct wlr_output_event_precommit event = {
struct wlr_output_event_precommit pre_event = {
.output = output,
.when = &now,
};
wlr_signal_emit_safe(&output->events.precommit, &event);
wlr_signal_emit_safe(&output->events.precommit, &pre_event);
if (!output->impl->commit(output)) {
output_state_clear(&output->pending);
@ -604,7 +604,11 @@ bool wlr_output_commit(struct wlr_output *output) {
output->commit_seq++;
wlr_signal_emit_safe(&output->events.commit, output);
struct wlr_output_event_commit event = {
.output = output,
.committed = output->pending.committed,
};
wlr_signal_emit_safe(&output->events.commit, &event);
bool scale_updated = output->pending.committed & WLR_OUTPUT_STATE_SCALE;
if (scale_updated) {