animation: Split spring setup out of weston_view_animation_run()

All the animations override at least one parameter of the spring that
is set during the creation of the animation. Some need to do the whole
setup again.

This patch changes the initialization of a view animation to a three
step process. First, the animation is created. Then the caller sets up
the spring and calls weston_view_animation_run() to apply the effect of
the animation for the first animation frame.

src/animation.c

@@ -181,13 +181,13 @@ weston_view_animation_frame(struct weston_animation *base,
 }
 
 static struct weston_view_animation *
-weston_view_animation_run(struct weston_view *view,
-			  float start, float stop,
-			  weston_view_animation_frame_func_t frame,
-			  weston_view_animation_frame_func_t reset,
-			  weston_view_animation_done_func_t done,
-			  void *data,
-			  void *private)
+weston_view_animation_create(struct weston_view *view,
+			     float start, float stop,
+			     weston_view_animation_frame_func_t frame,
+			     weston_view_animation_frame_func_t reset,
+			     weston_view_animation_done_func_t done,
+			     void *data,
+			     void *private)
 {
 	struct weston_view_animation *animation;
 
@@ -203,14 +203,12 @@ weston_view_animation_run(struct weston_view *view,
 	animation->start = start;
 	animation->stop = stop;
 	animation->private = private;
+
 	weston_matrix_init(&animation->transform.matrix);
 	wl_list_insert(&view->geometry.transformation_list,
 		       &animation->transform.link);
-	weston_spring_init(&animation->spring, 200.0, start, stop);
-	animation->spring.friction = 700;
-	animation->animation.frame_counter = 0;
+
 	animation->animation.frame = weston_view_animation_frame;
-	weston_view_animation_frame(&animation->animation, NULL, 0);
 
 	animation->listener.notify = handle_animation_view_destroy;
 	wl_signal_add(&view->destroy_signal, &animation->listener);
@@ -221,6 +219,13 @@ weston_view_animation_run(struct weston_view *view,
 	return animation;
 }
 
+static void
+weston_view_animation_run(struct weston_view_animation *animation)
+{
+	animation->animation.frame_counter = 0;
+	weston_view_animation_frame(&animation->animation, NULL, 0);
+}
+
 static void
 reset_alpha(struct weston_view_animation *animation)
 {
@@ -258,9 +263,9 @@ weston_zoom_run(struct weston_view *view, float start, float stop,
 {
 	struct weston_view_animation *zoom;
 
-	zoom = weston_view_animation_run(view, start, stop,
-					 zoom_frame, reset_alpha,
-					 done, data, NULL);
+	zoom = weston_view_animation_create(view, start, stop,
+					    zoom_frame, reset_alpha,
+					    done, data, NULL);
 
 	if (zoom == NULL)
 		return NULL;
@@ -269,6 +274,8 @@ weston_zoom_run(struct weston_view *view, float start, float stop,
 	zoom->spring.friction = 1400;
 	zoom->spring.previous = start - (stop - start) * 0.03;
 
+	weston_view_animation_run(zoom);
+
 	return zoom;
 }
 
@@ -290,20 +297,21 @@ weston_fade_run(struct weston_view *view,
 {
 	struct weston_view_animation *fade;
 
-	fade = weston_view_animation_run(view, start, end,
-					 fade_frame, reset_alpha,
-					 done, data, NULL);
+	fade = weston_view_animation_create(view, start, end,
+					    fade_frame, reset_alpha,
+					    done, data, NULL);
 
 	if (fade == NULL)
 		return NULL;
 
-	fade->spring.k = 1000.0;
-
+	weston_spring_init(&fade->spring, 1000.0, start, end);
 	fade->spring.friction = 4000;
 	fade->spring.previous = start - (end - start) * 0.1;
 
 	view->alpha = start;
 
+	weston_view_animation_run(fade);
+
 	return fade;
 }
 
@@ -339,7 +347,7 @@ weston_stable_fade_run(struct weston_view *front_view, float start,
 {
 	struct weston_view_animation *fade;
 
-	fade = weston_view_animation_run(front_view, 0, 0,
+	fade = weston_view_animation_create(front_view, 0, 0,
 					    stable_fade_frame, NULL,
 					    done, data, back_view);
 
@@ -352,6 +360,8 @@ weston_stable_fade_run(struct weston_view *front_view, float start,
 	front_view->alpha = start;
 	back_view->alpha = end;
 
+	weston_view_animation_run(fade);
+
 	return fade;
 }
 
@@ -373,16 +383,18 @@ weston_slide_run(struct weston_view *view, float start, float stop,
 {
 	struct weston_view_animation *animation;
 
-	animation = weston_view_animation_run(view, start, stop,
+	animation = weston_view_animation_create(view, start, stop,
 					      slide_frame, NULL, done,
 					      data, NULL);
 	if (!animation)
 		return NULL;
 
+	weston_spring_init(&animation->spring, 400.0, start, stop);
 	animation->spring.friction = 600;
-	animation->spring.k = 400;
 	animation->spring.clip = WESTON_SPRING_BOUNCE;
 
+	weston_view_animation_run(animation);
+
 	return animation;
 }
 
@@ -440,13 +452,13 @@ weston_move_scale_run(struct weston_view *view, int dx, int dy,
 	move->reverse = reverse;
 	move->done = done;
 
-	animation = weston_view_animation_run(view, start, end, move_frame,
-	                                      NULL, move_done, data, move);
+	animation = weston_view_animation_create(view, start, end, move_frame,
+						 NULL, move_done, data, move);
 
 	if (animation == NULL)
 		return NULL;
 
-	animation->spring.k = 400;
+	weston_spring_init(&animation->spring, 400.0, start, end);
 	animation->spring.friction = 1150;
 
 	return animation;