[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #54 from Till Matthiesen <high.entropy at web.de> ---
(In reply to comment #52)
> How about: 
> 
> diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
> index cc1778a..0a59681 100644
> --- a/src/sna/gen4_render.c
> +++ b/src/sna/gen4_render.c
> @@ -1895,6 +1895,9 @@ gen4_render_composite(struct sna *sna,
>         tmp->has_component_alpha = false;
>         tmp->need_magic_ca_pass = false;
>  
> +       if (!mask)
> +               mask = sna->render.white_picture;
> +
>         if (mask) {
>                 if (mask->componentAlpha && PICT_FORMAT_RGB(mask->format)) {
>                         tmp->has_component_alpha = true;

Doesn't fix it, unfortunately.

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