[PATCH weston 2/3] compositor-drm: Add support for drm plane FB_DAMAGE_CLIPS property

[Daniel Vetter]

On Wed, Sep 05, 2018 at 05:18:16PM -0700, Deepak Rawat wrote:
> The plane property FB_DAMAGE_CLIPS provides a way mark damaged regions
> on the plane in framebuffer coordinates of the framebuffer attached to
> the plane.
> 
> This patch adds a new member "damage" to compositor version of
> drm_plane_state and set FB_DAMAGE_CLIPS property whenever damage is
> available.
> 
> Signed-off-by: Deepak Rawat <drawat at vmware.com>
> Cc: dri-devel at lists.freedesktop.org

Note that weston has switched over to gitlab based merge requests:

https://gitlab.freedesktop.org/wayland/weston/blob/master/CONTRIBUTING.md

Cheers, Daniel
> ---
>  libweston/compositor-drm.c | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
> index 6a87a296..30f6fce9 100644
> --- a/libweston/compositor-drm.c
> +++ b/libweston/compositor-drm.c
> @@ -129,6 +129,7 @@ enum wdrm_plane_property {
>  	WDRM_PLANE_FB_ID,
>  	WDRM_PLANE_CRTC_ID,
>  	WDRM_PLANE_IN_FORMATS,
> +	WDRM_PLANE_FB_DAMAGE_CLIPS,
>  	WDRM_PLANE__COUNT
>  };
>  
> @@ -171,6 +172,7 @@ static const struct drm_property_info plane_props[] = {
>  	[WDRM_PLANE_FB_ID] = { .name = "FB_ID", },
>  	[WDRM_PLANE_CRTC_ID] = { .name = "CRTC_ID", },
>  	[WDRM_PLANE_IN_FORMATS] = { .name = "IN_FORMATS" },
> +	[WDRM_PLANE_FB_DAMAGE_CLIPS] = { .name = "FB_DAMAGE_CLIPS" },
>  };
>  
>  /**
> @@ -403,6 +405,8 @@ struct drm_plane_state {
>  
>  	bool complete;
>  
> +	pixman_region32_t damage; /* damage sent to kernel */
> +
>  	struct wl_list link; /* drm_output_state::plane_list */
>  };
>  
> @@ -1306,6 +1310,7 @@ drm_plane_state_alloc(struct drm_output_state *state_output,
>  	assert(state);
>  	state->output_state = state_output;
>  	state->plane = plane;
> +	pixman_region32_init(&state->damage);
>  
>  	/* Here we only add the plane state to the desired link, and not
>  	 * set the member. Having an output pointer set means that the
> @@ -1336,6 +1341,7 @@ drm_plane_state_free(struct drm_plane_state *state, bool force)
>  	wl_list_remove(&state->link);
>  	wl_list_init(&state->link);
>  	state->output_state = NULL;
> +	pixman_region32_fini(&state->damage);
>  
>  	if (force || state != state->plane->state_cur) {
>  		drm_fb_unref(state->fb);
> @@ -1373,6 +1379,7 @@ drm_plane_state_duplicate(struct drm_output_state *state_output,
>  	if (src->fb)
>  		dst->fb = drm_fb_ref(src->fb);
>  	dst->output_state = state_output;
> +	pixman_region32_init(&dst->damage);
>  	dst->complete = false;
>  
>  	return dst;
> @@ -2409,6 +2416,33 @@ drm_mode_ensure_blob(struct drm_backend *backend, struct drm_mode *mode)
>  	return ret;
>  }
>  
> +static int
> +plane_add_damage(drmModeAtomicReq *req, struct drm_backend *backend,
> +		 struct drm_plane_state *plane_state)
> +{
> +	struct drm_plane *plane = plane_state->plane;
> +	pixman_box32_t *rects;
> +	uint32_t blob_id;
> +	int n_rects;
> +	int ret;
> +
> +	if (!pixman_region32_not_empty(&plane_state->damage))
> +		return 0;
> +
> +	rects = pixman_region32_rectangles(&plane_state->damage, &n_rects);
> +
> +	ret = drmModeCreatePropertyBlob(backend->drm.fd, rects,
> +					sizeof(*rects) * n_rects, &blob_id);
> +	if (ret != 0)
> +		return ret;
> +
> +	ret = plane_add_prop(req, plane, WDRM_PLANE_FB_DAMAGE_CLIPS, blob_id);
> +	if (ret != 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
>  static int
>  drm_output_apply_state_atomic(struct drm_output_state *state,
>  			      drmModeAtomicReq *req,
> @@ -2477,6 +2511,7 @@ drm_output_apply_state_atomic(struct drm_output_state *state,
>  				      plane_state->dest_w);
>  		ret |= plane_add_prop(req, plane, WDRM_PLANE_CRTC_H,
>  				      plane_state->dest_h);
> +		ret |= plane_add_damage(req, backend, plane_state);
>  
>  		if (ret != 0) {
>  			weston_log("couldn't set plane state\n");
> -- 
> 2.17.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch