output: introduce request_state event

This allows backends to request the compositor to change the state
of an output.

References: https://github.com/swaywm/wlroots/issues/2300#issuecomment-761819673

2 files changed, 11 insertions, 0 deletions

diff --git a/include/wlr/interfaces/wlr_output.h b/include/wlr/interfaces/wlr_output.h
index 7ef3de98..cfad8f70 100644
--- a/include/wlr/interfaces/wlr_output.h
+++ b/include/wlr/interfaces/wlr_output.h
@@ -146,5 +146,10 @@ void wlr_output_send_frame(struct wlr_output *output);
  */
 void wlr_output_send_present(struct wlr_output *output,
 	struct wlr_output_event_present *event);
+/**
+ * Request the compositor to apply new state.
+ */
+void wlr_output_send_request_state(struct wlr_output *output,
+	const struct wlr_output_state *state);
 
 #endif
diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index 6b39cfc8..bb056b30 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -178,6 +178,7 @@ struct wlr_output {
 		struct wl_signal enable;
 		struct wl_signal mode;
 		struct wl_signal description;
+		struct wl_signal request_state;
 		struct wl_signal destroy;
 	} events;
 
@@ -258,6 +259,11 @@ struct wlr_output_event_bind {
 	struct wl_resource *resource;
 };
 
+struct wlr_output_event_request_state {
+	struct wlr_output *output;
+	const struct wlr_output_state *state;
+};
+
 struct wlr_surface;
 
 /**