output: introduce wlr_output_event_commit
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
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@ -163,7 +163,7 @@ struct wlr_output {
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// Emitted right before commit
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struct wl_signal precommit; // wlr_output_event_precommit
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// Emitted right after commit
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struct wl_signal commit;
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struct wl_signal commit; // wlr_output_event_commit
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// Emitted right after the buffer has been presented to the user
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struct wl_signal present; // wlr_output_event_present
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struct wl_signal enable;
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@ -198,6 +198,11 @@ struct wlr_output_event_precommit {
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struct timespec *when;
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};
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struct wlr_output_event_commit {
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struct wlr_output *output;
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uint32_t committed; // bitmask of enum wlr_output_state_field
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};
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enum wlr_output_present_flag {
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// The presentation was synchronized to the "vertical retrace" by the
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// display hardware such that tearing does not happen.
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@ -581,11 +581,11 @@ bool wlr_output_commit(struct wlr_output *output) {
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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struct wlr_output_event_precommit event = {
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struct wlr_output_event_precommit pre_event = {
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.output = output,
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.when = &now,
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};
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wlr_signal_emit_safe(&output->events.precommit, &event);
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wlr_signal_emit_safe(&output->events.precommit, &pre_event);
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if (!output->impl->commit(output)) {
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output_state_clear(&output->pending);
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@ -604,7 +604,11 @@ bool wlr_output_commit(struct wlr_output *output) {
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output->commit_seq++;
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wlr_signal_emit_safe(&output->events.commit, output);
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struct wlr_output_event_commit event = {
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.output = output,
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.committed = output->pending.committed,
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};
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wlr_signal_emit_safe(&output->events.commit, &event);
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bool scale_updated = output->pending.committed & WLR_OUTPUT_STATE_SCALE;
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if (scale_updated) {
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