[PATCH 1/2] animation: add fading-in animation

[yan.wang at linux.intel.com]

> From: Juan Zhao <juan.j.zhao at intel.com>
>
> To ful-fill user experience, add the fading-in animation
> when mapping a window.
>
> Signed-off-by: Juan Zhao <juan.j.zhao at intel.com>
> ---
>  src/util.c |   89
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 89 insertions(+), 0 deletions(-)
>
> diff --git a/src/util.c b/src/util.c
> index c7511cf..d452434 100644
> --- a/src/util.c
> +++ b/src/util.c
> @@ -96,6 +96,16 @@ struct weston_zoom {
>  	void *data;
>  };
>
> +struct weston_fade {
> +	struct weston_surface *surface;
> +	struct weston_animation animation;
> +	struct weston_transform transform;
> +	struct weston_spring spring;
> +	struct wl_listener listener;
> +	void (*done)(struct weston_fade *fade, void *data);
> +	void *data;
> +};
> +
>  static void
>  weston_zoom_destroy(struct weston_zoom *zoom)
>  {
> @@ -325,3 +335,82 @@ weston_environment_get_fd(const char *env)
>
>  	return fd;
>  }
> +/*fade in and fade out animation*/
> +static void
> +weston_fade_destroy(struct weston_fade *fade)
> +{
> +	wl_list_remove(&fade->animation.link);
> +	wl_list_remove(&fade->listener.link);
> +	wl_list_remove(&fade->transform.link);
> +	fade->surface->geometry.dirty = 1;
> +	if (fade->done)
> +		fade->done(fade, fade->data);
> +	free(fade);
> +}
> +
> +static void
> +handle_fade_surface_destroy(struct wl_listener *listener, void *data)
> +{
> +	struct weston_fade *fade =
> +		container_of(listener, struct weston_fade, listener);
> +
> +	weston_fade_destroy(fade);
> +}
> +
> +static void
> +weston_fade_frame(struct weston_animation *animation,
> +		struct weston_output *output, uint32_t msecs)
> +{
> +	struct weston_fade *fade =
> +		container_of(animation, struct weston_fade, animation);
> +	struct weston_surface *es = fade->surface;
> +	float fade_factor;
> +
> +	weston_spring_update(&fade->spring, msecs);
> +
> +	if (weston_spring_done(&fade->spring)) {
> +		weston_fade_destroy(fade);
> +		return;
> +	}
> +	if (fade->spring.current > 1)
> +		fade_factor = 1;
> +	else if (fade->spring.current < 0 )
> +		fade_factor = 0;
> +	else
> +		fade_factor = fade->spring.current;
> +	es->alpha = fade_factor * 255;
> +
> +	weston_surface_damage(es);
> +}
> +
> +WL_EXPORT struct weston_fade *
> +weston_fade_run(struct weston_surface *surface,
> +	      weston_fade_done_func_t done, void *data)
> +{
> +	struct weston_fade *fade;
> +
> +	fade = malloc(sizeof *fade);
> +	if (!fade)
> +		return NULL;
> +
> +	fade->surface = surface;
> +	fade->done = done;
> +	fade->data = data;
> +	weston_spring_init(&fade->spring, 200.0, 0, 1.0);
> +	fade->spring.friction = 700;
> +	fade->spring.timestamp = weston_compositor_get_time();
> +	fade->animation.frame = weston_fade_frame;
> +	wl_list_insert(&surface->geometry.transformation_list,
> +		       &fade->transform.link);
> +	weston_fade_frame(&fade->animation, NULL, fade->spring.timestamp);
> +
> +	fade->listener.notify = handle_fade_surface_destroy;
> +	wl_signal_add(&surface->surface.resource.destroy_signal,
> +		      &fade->listener);
> +
> +	wl_list_insert(&surface->compositor->animation_list,
> +		       &fade->animation.link);
> +
> +	return fade;
> +}
> +
> --
> 1.7.5.4
>
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>
Just confirmation when comparing with weston_zoom_frame:
1. In weston_zoom_frame, scale is calculated by start, stop and current
value of spring and as the coefficient of alpha. Why use different logic
in weston_fade_frame?
2. In weston_zoom_frame, weston_compositor_schedule_repaint is called; in
weston_fade_frame, weston_surface_damage is called. weston_surface_damage
seems only to process pixmap region?

Thanks.
Yan Wang