[PATCH v2 12/43] drm/fourcc: Add format helpers for checking YUV sub-sampling

[Ayan.Halder@arm.com (Ayan Halder)]

On Fri, Nov 23, 2018 at 10:24:44AM +0100, Paul Kocialkowski wrote:

Hi Paul,

> This introduces new format helpers that use the previously-introduced
> format info helpers for checking YUV sub-sampling.
> 
> Only the format fourcc is required by these helpers and the formats are
> iterated from the list.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
>  include/drm/drm_fourcc.h     |   5 ++
>  2 files changed, 110 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index b56e773f9f63..6d395c586ad5 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -492,6 +492,111 @@ bool drm_format_is_yuv_planar(uint32_t format)
>  }
>  EXPORT_SYMBOL(drm_format_is_yuv_planar);
>  
> +/**
> + * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
> + * 4:1:0 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:1:0
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_410(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_410(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
> +
> +/**
> + * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
> + * 4:1:1 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:1:1
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_411(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_411(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
> +
> +/**
> + * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
> + * 4:2:0 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:2:0
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_420(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_420(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
> +
> +/**
> + * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
> + * 4:2:2 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:2:2
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_422(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_422(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
> +
> +/**
> + * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
> + * 4:4:4 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:4:4
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_444(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_444(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
> +
>  /**
>   * drm_format_info_block_width - width in pixels of block.
>   * @info: pixel format info
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index d170b7b323f7..cf082d8b6ad4 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -278,6 +278,11 @@ bool drm_format_is_yuv(uint32_t format);
>  bool drm_format_is_yuv_packed(uint32_t format);
>  bool drm_format_is_yuv_semiplanar(uint32_t format);
>  bool drm_format_is_yuv_planar(uint32_t format);
> +bool drm_format_is_yuv_sampling_410(uint32_t format);
> +bool drm_format_is_yuv_sampling_411(uint32_t format);
> +bool drm_format_is_yuv_sampling_420(uint32_t format);
> +bool drm_format_is_yuv_sampling_422(uint32_t format);
> +bool drm_format_is_yuv_sampling_444(uint32_t format);
>  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
>  					 int plane);
>  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> -- 
> 2.19.1
> 
>From patches [PATCH v2 08/43] till [PATCH v2 12/43], looks good to me.

How about clubbing all the drm_format_helper functions together in a
separate file (call it drm_fourcc_helper.c)? This way, we could
keep the __drm_format_info[] only drm_fourcc.c.

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