[PATCH weston 1/2] compositor: set the opaque region for some views with transform

[Jonas Ådahl]

On Sun, Sep 04, 2016 at 06:50:46PM +0300, Giulio Camuffo wrote:
> If the transform on a view is only a translation we can trivially
> set the opaque region for it so to optimize the rendering.

Makes sense.

Reviewed-by: Jonas Ådahl <jadahl at gmail.com>

> ---
>  libweston/compositor.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/libweston/compositor.c b/libweston/compositor.c
> index 47907bb..8c3872d 100644
> --- a/libweston/compositor.c
> +++ b/libweston/compositor.c
> @@ -1192,6 +1192,15 @@ weston_view_update_transform_enable(struct weston_view *view)
>  		return -1;
>  	}
>  
> +	if (view->alpha == 1.0 &&
> +	    matrix->type == WESTON_MATRIX_TRANSFORM_TRANSLATE) {
> +		pixman_region32_copy(&view->transform.opaque,
> +				     &view->surface->opaque);
> +		pixman_region32_translate(&view->transform.opaque,
> +					  matrix->d[12],
> +					  matrix->d[13]);
> +	}
> +
>  	pixman_region32_init_rect(&surfregion, 0, 0,
>  				  view->surface->width, view->surface->height);
>  	if (view->geometry.scissor_enabled)
> -- 
> 2.9.3
> 
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