gamma-control-v1: stop applying gamma LUTs implicitly

Make the compositor responsible for doing that, so that they can
properly integrate with their output commit sequence.

include/wlr/types/wlr_gamma_control_v1.h

@@ -31,7 +31,6 @@ struct wlr_gamma_control_v1 {
 	uint16_t *table;
 	size_t ramp_size;
 
-	struct wl_listener output_commit_listener;
 	struct wl_listener output_destroy_listener;
 
 	void *data;

types/wlr_gamma_control_v1.c

@@ -25,13 +25,8 @@ static void gamma_control_destroy(struct wlr_gamma_control_v1 *gamma_control) {
 	struct wlr_gamma_control_manager_v1 *manager = gamma_control->manager;
 	struct wlr_output *output = gamma_control->output;
 
-	wlr_output_set_gamma(gamma_control->output, 0, NULL, NULL, NULL);
-	// Gamma LUT will be applied on next output commit
-	wlr_output_schedule_frame(gamma_control->output);
-
 	wl_resource_set_user_data(gamma_control->resource, NULL);
 	wl_list_remove(&gamma_control->output_destroy_listener.link);
-	wl_list_remove(&gamma_control->output_commit_listener.link);
 	wl_list_remove(&gamma_control->link);
 	free(gamma_control->table);
 	free(gamma_control);
@@ -42,22 +37,6 @@ static void gamma_control_destroy(struct wlr_gamma_control_v1 *gamma_control) {
 	wl_signal_emit_mutable(&manager->events.set_gamma, &event);
 }
 
-static void gamma_control_apply(struct wlr_gamma_control_v1 *gamma_control) {
-	uint16_t *r = gamma_control->table;
-	uint16_t *g = gamma_control->table + gamma_control->ramp_size;
-	uint16_t *b = gamma_control->table + 2 * gamma_control->ramp_size;
-
-	wlr_output_set_gamma(gamma_control->output, gamma_control->ramp_size, r, g, b);
-	if (!wlr_output_test(gamma_control->output)) {
-		wlr_output_rollback(gamma_control->output);
-		wlr_gamma_control_v1_send_failed_and_destroy(gamma_control);
-		return;
-	}
-
-	// Gamma LUT will be applied on next output commit
-	wlr_output_schedule_frame(gamma_control->output);
-}
-
 static const struct zwlr_gamma_control_v1_interface gamma_control_impl;
 
 static struct wlr_gamma_control_v1 *gamma_control_from_resource(
@@ -80,17 +59,6 @@ static void gamma_control_handle_output_destroy(struct wl_listener *listener,
 	gamma_control_destroy(gamma_control);
 }
 
-static void gamma_control_handle_output_commit(struct wl_listener *listener,
-		void *data) {
-	struct wlr_gamma_control_v1 *gamma_control =
-		wl_container_of(listener, gamma_control, output_commit_listener);
-	struct wlr_output_event_commit *event = data;
-	if ((event->committed & WLR_OUTPUT_STATE_ENABLED) &&
-			gamma_control->output->enabled) {
-		gamma_control_apply(gamma_control);
-	}
-}
-
 static void gamma_control_handle_set_gamma(struct wl_client *client,
 		struct wl_resource *gamma_control_resource, int fd) {
 	struct wlr_gamma_control_v1 *gamma_control =
@@ -140,10 +108,6 @@ static void gamma_control_handle_set_gamma(struct wl_client *client,
 	gamma_control->table = table;
 	gamma_control->ramp_size = ramp_size;
 
-	if (gamma_control->output->enabled) {
-		gamma_control_apply(gamma_control);
-	}
-
 	struct wlr_gamma_control_manager_v1_set_gamma_event event = {
 		.output = gamma_control->output,
 		.control = gamma_control,
@@ -222,11 +186,6 @@ static void gamma_control_manager_get_gamma_control(struct wl_client *client,
 	gamma_control->output_destroy_listener.notify =
 		gamma_control_handle_output_destroy;
 
-	wl_signal_add(&output->events.commit,
-		&gamma_control->output_commit_listener);
-	gamma_control->output_commit_listener.notify =
-		gamma_control_handle_output_commit;
-
 	wl_list_insert(&manager->controls, &gamma_control->link);
 	zwlr_gamma_control_v1_send_gamma_size(gamma_control->resource, gamma_size);
 }