linux-kernel - Re: [PATCH 01/19] drm/fourcc: Add a function to tell if the format embeds alpha

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Message-ID: <20180109132651.300c1c14@bbrezillon>
Date:   Tue, 9 Jan 2018 13:26:51 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        thomas@...sch.nl, Eric Anholt <eric@...olt.net>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mark Yao <mark.yao@...k-chips.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>
Subject: Re: [PATCH 01/19] drm/fourcc: Add a function to tell if the format
 embeds alpha

On Tue,  9 Jan 2018 11:56:20 +0100
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> There's a bunch of drivers that duplicate the same function to know if a
> particular format embeds an alpha component or not.
> 
> Let's create a helper to avoid duplicating that logic.
> 
> Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> Cc: Eric Anholt <eric@...olt.net>
> Cc: Inki Dae <inki.dae@...sung.com>
> Cc: Joonyoung Shim <jy0922.shim@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Mark Yao <mark.yao@...k-chips.com>
> Cc: Seung-Woo Kim <sw0312.kim@...sung.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c | 43 +++++++++++++++++++++++++++++++++++++-
>  include/drm/drm_fourcc.h     |  1 +-
>  2 files changed, 44 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 9c0152df45ad..6e6227d6a46b 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -348,3 +348,46 @@ int drm_format_plane_height(int height, uint32_t format, int plane)
>  	return height / info->vsub;
>  }
>  EXPORT_SYMBOL(drm_format_plane_height);
> +
> +/**
> + * drm_format_has_alpha - get whether the format embeds an alpha component
> + * @format: pixel format (DRM_FORMAT_*)
> + *
> + * Returns:
> + * true if the format embeds an alpha component, false otherwise.
> + */
> +bool drm_format_has_alpha(uint32_t format)
> +{
> +	switch (format) {
> +	case DRM_FORMAT_ARGB4444:
> +	case DRM_FORMAT_ABGR4444:
> +	case DRM_FORMAT_RGBA4444:
> +	case DRM_FORMAT_BGRA4444:
> +	case DRM_FORMAT_ARGB1555:
> +	case DRM_FORMAT_ABGR1555:
> +	case DRM_FORMAT_RGBA5551:
> +	case DRM_FORMAT_BGRA5551:
> +	case DRM_FORMAT_ARGB8888:
> +	case DRM_FORMAT_ABGR8888:
> +	case DRM_FORMAT_RGBA8888:
> +	case DRM_FORMAT_BGRA8888:
> +	case DRM_FORMAT_ARGB2101010:
> +	case DRM_FORMAT_ABGR2101010:
> +	case DRM_FORMAT_RGBA1010102:
> +	case DRM_FORMAT_BGRA1010102:
> +	case DRM_FORMAT_AYUV:
> +	case DRM_FORMAT_XRGB8888_A8:
> +	case DRM_FORMAT_XBGR8888_A8:
> +	case DRM_FORMAT_RGBX8888_A8:
> +	case DRM_FORMAT_BGRX8888_A8:
> +	case DRM_FORMAT_RGB888_A8:
> +	case DRM_FORMAT_BGR888_A8:
> +	case DRM_FORMAT_RGB565_A8:
> +	case DRM_FORMAT_BGR565_A8:
> +		return true;
> +
> +	default:
> +		return false;
> +	}
> +}
> +EXPORT_SYMBOL(drm_format_has_alpha);
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index 6942e84b6edd..e08fc22c5f78 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -69,5 +69,6 @@ int drm_format_vert_chroma_subsampling(uint32_t format);
>  int drm_format_plane_width(int width, uint32_t format, int plane);
>  int drm_format_plane_height(int height, uint32_t format, int plane);
>  const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
> +bool drm_format_has_alpha(uint32_t format);
>  
>  #endif /* __DRM_FOURCC_H__ */