compositor: Add public interface support for client-requested idle inhibition

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>

v5: Improve comments

Makefile.am

@@ -176,7 +176,9 @@ nodist_libweston_@LIBWESTON_MAJOR@_la_SOURCES =				\
 	protocol/relative-pointer-unstable-v1-protocol.c		\
 	protocol/relative-pointer-unstable-v1-server-protocol.h		\
 	protocol/pointer-constraints-unstable-v1-protocol.c		\
-	protocol/pointer-constraints-unstable-v1-server-protocol.h
+	protocol/pointer-constraints-unstable-v1-server-protocol.h	\
+	protocol/idle-inhibit-unstable-v1-protocol.c	\
+	protocol/idle-inhibit-unstable-v1-server-protocol.h
 
 BUILT_SOURCES += $(nodist_libweston_@LIBWESTON_MAJOR@_la_SOURCES)
 

libweston/compositor.c

@@ -51,6 +51,8 @@
 #include <time.h>
 #include <errno.h>
 
+#include <idle-inhibit-unstable-v1-server-protocol.h>
+
 #include "timeline.h"
 
 #include "compositor.h"
@@ -4723,6 +4725,88 @@ compositor_bind(struct wl_client *client,
 				       compositor, NULL);
 }
 
+struct weston_idle_inhibitor {
+	struct weston_surface *surface;
+};
+
+static void
+destroy_idle_inhibitor(struct wl_resource *resource)
+{
+	struct weston_idle_inhibitor *inhibitor = wl_resource_get_user_data(resource);
+
+	inhibitor->surface = NULL;
+	free(inhibitor);
+}
+
+static void
+idle_inhibitor_destroy(struct wl_client *client, struct wl_resource *resource)
+{
+	struct weston_idle_inhibitor *inhibitor = wl_resource_get_user_data(resource);
+
+	assert(inhibitor);
+
+	inhibitor->surface->inhibit_idling = false;
+}
+
+static const struct zwp_idle_inhibitor_v1_interface idle_inhibitor_interface = {
+	idle_inhibitor_destroy
+};
+
+static void
+idle_inhibit_manager_destroy(struct wl_client *client, struct wl_resource *resource)
+{
+}
+
+static void
+idle_inhibit_manager_create_inhibitor(struct wl_client *client, struct wl_resource *resource,
+				      uint32_t id, struct wl_resource *surface_resource)
+{
+	struct weston_surface *surface = wl_resource_get_user_data(surface_resource);
+	struct weston_idle_inhibitor *inhibitor;
+	struct wl_resource *cr;
+
+	cr = wl_resource_create(client, &zwp_idle_inhibitor_v1_interface,
+				wl_resource_get_version(resource), id);
+	if (cr == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	inhibitor = zalloc(sizeof *inhibitor);
+	if (inhibitor == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	inhibitor->surface = surface;
+	inhibitor->surface->inhibit_idling = true;
+
+	wl_resource_set_implementation(cr, &idle_inhibitor_interface,
+				       inhibitor, destroy_idle_inhibitor);
+}
+
+static const struct zwp_idle_inhibit_manager_v1_interface idle_inhibit_manager_interface = {
+	idle_inhibit_manager_destroy,
+	idle_inhibit_manager_create_inhibitor
+};
+
+static void
+bind_idle_inhibit_manager(struct wl_client *client,
+			  void *data, uint32_t version, uint32_t id)
+{
+	struct wl_resource *resource;
+
+	resource = wl_resource_create(client, &zwp_idle_inhibit_manager_v1_interface,
+				      version, id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+
+	wl_resource_set_implementation(resource, &idle_inhibit_manager_interface,
+				       NULL, NULL);
+}
+
 WL_EXPORT int
 weston_environment_get_fd(const char *env)
 {
@@ -4818,6 +4902,10 @@ weston_compositor_create(struct wl_display *display, void *user_data)
 	if (weston_input_init(ec) != 0)
 		goto fail;
 
+	if (!wl_global_create(ec->wl_display, &zwp_idle_inhibit_manager_v1_interface, 1,
+			      ec, bind_idle_inhibit_manager))
+		goto fail;
+
 	wl_list_init(&ec->view_list);
 	wl_list_init(&ec->plane_list);
 	wl_list_init(&ec->layer_list);

libweston/compositor.h

@@ -618,8 +618,9 @@ enum {
 	WESTON_COMPOSITOR_ACTIVE,	/* normal rendering and events */
 	WESTON_COMPOSITOR_IDLE,		/* shell->unlock called on activity */
 	WESTON_COMPOSITOR_OFFSCREEN,	/* no rendering, no frame events */
-	WESTON_COMPOSITOR_SLEEPING	/* same as offscreen, but also set dpms
-                                         * to off */
+	WESTON_COMPOSITOR_SLEEPING	/* same as offscreen, but also
+					 * attempt to set dpms to off where
+					 * applicable */
 };
 
 struct weston_layer_entry {
@@ -1158,8 +1159,7 @@ struct weston_surface {
 
 	/*
 	 * Indicates the surface prefers no screenblanking, screensaving,
-	 * or other automatic obscurement to kick in while the surface is
-	 * considered "active" by the shell.
+	 * or other automatic obscurement to kick in.
 	 */
 	bool inhibit_idling;