On Tue, 9 Jan 2018 11:56:20 +0100
Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> Cc: Eric Anholt <eric@xxxxxxxxxx>
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Mark Yao <mark.yao@xxxxxxxxxxxxxx>
> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> ---
> 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__ */
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