Recomposite screen in idle handler.

client.c

@@ -141,11 +141,11 @@ int main(int argc, char *argv[])
 			  cairo_image_surface_get_stride(s));
 
 	i = 0;
-	while (ret = poll(p, 1, 200), ret >= 0) {
+	while (ret = poll(p, 1, 20), ret >= 0) {
 		if (ret == 0) {
 			wl_surface_map(surface, 
-				       x + cos(i / 10.0) * 150,
-				       y + sin(i / 10.0) * 150,
+				       x + cos(i / 10.0) * 200,
+				       y + sin(i / 11.0) * 200,
 				       width, height);
 			i++;
 			continue;

egl-compositor.c

@@ -137,8 +137,9 @@ void notify_surface_attach(struct wl_compositor *compositor,
 }
 
 static void
-repaint(struct egl_compositor *ec)
+repaint(void *data)
 {
+	struct egl_compositor *ec = data;
 	struct wl_surface_iterator *iterator;
 	struct wl_surface *surface;
 	struct surface_data *sd;
@@ -197,13 +198,16 @@ void notify_surface_map(struct wl_compositor *compositor,
 {
 	struct egl_compositor *ec = (struct egl_compositor *) compositor;
 	struct surface_data *sd;
+	struct wl_event_loop *loop;
 
 	sd = wl_surface_get_data(surface);
 	if (sd == NULL)
 		return;
 
 	sd->map = *map;
-	repaint(ec);
+
+	loop = wl_display_get_event_loop(ec->wl_display);
+	wl_event_loop_add_idle(loop, repaint, ec);
 }
 
 struct wl_compositor_interface interface = {

event-loop.c

@@ -11,18 +11,20 @@
 
 struct wl_event_loop {
 	int epoll_fd;
+	wl_event_loop_idle_func_t idle_func;
+	void *idle_data;
 };
 
 struct wl_event_source {
 	int fd;
-	wl_event_loop_func_t func;
+	wl_event_loop_fd_func_t func;
 	void *data;
 };
 
 struct wl_event_source *
 wl_event_loop_add_fd(struct wl_event_loop *loop,
 		     int fd, uint32_t mask,
-		     wl_event_loop_func_t func,
+		     wl_event_loop_fd_func_t func,
 		     void *data)
 {
 	struct wl_event_source *source;
@@ -48,16 +50,23 @@ wl_event_loop_add_fd(struct wl_event_loop *loop,
 	return source;
 }
 
+struct wl_event_source idle_source;
+
 int
 wl_event_loop_remove_source(struct wl_event_loop *loop,
 			    struct wl_event_source *source)
 {
 	int fd;
 
-	fd = source->fd;
-	free(source);
-
-	return epoll_ctl(loop->epoll_fd, EPOLL_CTL_DEL, fd, NULL);
+	if (source == &idle_source) {
+		loop->idle_func = NULL;
+		return 0;
+	} else {
+		fd = source->fd;
+		free(source);
+		return epoll_ctl(loop->epoll_fd,
+				 EPOLL_CTL_DEL, fd, NULL);
+	};
 }
 
 int
@@ -103,6 +112,17 @@ wl_event_loop_destroy(struct wl_event_loop *loop)
 	free(loop);
 }
 
+struct wl_event_source *
+wl_event_loop_add_idle(struct wl_event_loop *loop,
+		       wl_event_loop_idle_func_t func,
+		       void *data)
+{
+	loop->idle_func = func;
+	loop->idle_data = data;
+
+	return &idle_source;
+}
+
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
 int
@@ -110,10 +130,15 @@ wl_event_loop_wait(struct wl_event_loop *loop)
 {
 	struct epoll_event ep[32];
 	struct wl_event_source *source;
-	int i, count;
+	int i, count, timeout;
 	uint32_t mask;
 
-	count = epoll_wait(loop->epoll_fd, ep, ARRAY_LENGTH(ep), -1);
+	if (loop->idle_func)
+		timeout = 0;
+	else
+		timeout = -1;
+
+	count = epoll_wait(loop->epoll_fd, ep, ARRAY_LENGTH(ep), timeout);
 	if (count < 0)
 		return -1;
 
@@ -128,5 +153,10 @@ wl_event_loop_wait(struct wl_event_loop *loop)
 		source->func(source->fd, mask, source->data);
 	}
 
+	if (count == 0 && loop->idle_func != NULL) {
+		loop->idle_func(loop->idle_data);
+		loop->idle_func = NULL;
+	}
+	
 	return 0;
 }

wayland.c

@@ -469,6 +469,12 @@ wl_display_set_compositor(struct wl_display *display,
 	display->compositor = compositor;
 }
 
+struct wl_event_loop *
+wl_display_get_event_loop(struct wl_display *display)
+{
+	return display->loop;
+}
+
 void
 wl_display_run(struct wl_display *display)
 {

wayland.h

@@ -10,13 +10,14 @@ enum {
 
 struct wl_event_loop;
 struct wl_event_source;
-typedef void (*wl_event_loop_func_t)(int fd, uint32_t mask, void *data);
+typedef void (*wl_event_loop_fd_func_t)(int fd, uint32_t mask, void *data);
+typedef void (*wl_event_loop_idle_func_t)(void *data);
 
 struct wl_event_loop *wl_event_loop_create(void);
 void wl_event_loop_destroy(struct wl_event_loop *loop);
 struct wl_event_source *wl_event_loop_add_fd(struct wl_event_loop *loop,
 					     int fd, uint32_t mask,
-					     wl_event_loop_func_t func,
+					     wl_event_loop_fd_func_t func,
 					     void *data);
 int wl_event_loop_update_source(struct wl_event_loop *loop,
 				struct wl_event_source *source,
@@ -25,6 +26,9 @@ int wl_event_loop_update_source(struct wl_event_loop *loop,
 int wl_event_loop_remove_source(struct wl_event_loop *loop,
 				struct wl_event_source *source);
 int wl_event_loop_wait(struct wl_event_loop *loop);
+struct wl_event_source *wl_event_loop_add_idle(struct wl_event_loop *loop,
+					       wl_event_loop_idle_func_t func,
+					       void *data);
 
 struct wl_hash {
 	struct wl_object **objects;
@@ -81,6 +85,8 @@ struct wl_map {
 	int32_t x, y, width, height;
 };
 
+struct wl_event_loop *wl_display_get_event_loop(struct wl_display *display);
+
 void wl_surface_set_data(struct wl_surface *surface, void *data);
 void *wl_surface_get_data(struct wl_surface *surface);