[PATCH] glx: do not pick sRGB config for 32-bit RGBA visual

[Tapani Pälli]

Hi;

Any comments? Without this change there will be issues with certain 
Linux desktops when distributions start to use Mesa 17.4.

On 11/28/2017 09:23 AM, Tapani Pälli wrote:
> This fixes blending issues seen with kwin and gnome-shell when
> 32bit visual has sRGB capability set.
> 
> Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103699
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103646
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103655
> ---
>   glx/glxscreens.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/glx/glxscreens.c b/glx/glxscreens.c
> index 73444152a..596d972e0 100644
> --- a/glx/glxscreens.c
> +++ b/glx/glxscreens.c
> @@ -271,6 +271,11 @@ pickFBConfig(__GLXscreen * pGlxScreen, VisualPtr visual)
>           /* If it's the 32-bit RGBA visual, demand a 32-bit fbconfig. */
>           if (visual->nplanes == 32 && config->rgbBits != 32)
>               continue;
> +        /* If it's the 32-bit RGBA visual, do not pick sRGB capable config.
> +         * This can cause issues with compositors that are not sRGB aware.
> +         */
> +        if (visual->nplanes == 32 && config->sRGBCapable == GL_TRUE)
> +            continue;
>           /* Can't use the same FBconfig for multiple X visuals.  I think. */
>           if (config->visualID != 0)
>               continue;
>