Unverified Commit a211e56e authored by Paul Kocialkowski's avatar Paul Kocialkowski Committed by Maxime Ripard
Browse files

drm/fourcc: Add format info helpers for checking YUV sub-sampling 



Display engine drivers often need to distinguish between different types of
YUV sub-sampling. This introduces helpers to check for common sub-sampling
ratios in their commonly-used denomination from the DRM format info.

Signed-off-by: default avatarPaul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: default avatarMaxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190118145133.21281-3-paul.kocialkowski@bootlin.com
parent 41c8c210

include/drm/drm_fourcc.h

+75 −0
Original line number Diff line number Diff line
@@ -185,6 +185,81 @@ drm_format_info_is_yuv_planar(const struct drm_format_info *info) 
	return info->is_yuv && info->num_planes == 3;

}



/**

 * drm_format_info_is_yuv_sampling_410 - check that the format info matches a

 * YUV format with 4:1:0 sub-sampling

 * @info: format info

 *

 * Returns:

 * A boolean indicating whether the format info matches a YUV format with 4:1:0

 * sub-sampling.

 */

static inline bool

drm_format_info_is_yuv_sampling_410(const struct drm_format_info *info)

{

	return info->is_yuv && info->hsub == 4 && info->vsub == 4;

}



/**

 * drm_format_info_is_yuv_sampling_411 - check that the format info matches a

 * YUV format with 4:1:1 sub-sampling

 * @info: format info

 *

 * Returns:

 * A boolean indicating whether the format info matches a YUV format with 4:1:1

 * sub-sampling.

 */

static inline bool

drm_format_info_is_yuv_sampling_411(const struct drm_format_info *info)

{

	return info->is_yuv && info->hsub == 4 && info->vsub == 1;

}



/**

 * drm_format_info_is_yuv_sampling_420 - check that the format info matches a

 * YUV format with 4:2:0 sub-sampling

 * @info: format info

 *

 * Returns:

 * A boolean indicating whether the format info matches a YUV format with 4:2:0

 * sub-sampling.

 */

static inline bool

drm_format_info_is_yuv_sampling_420(const struct drm_format_info *info)

{

	return info->is_yuv && info->hsub == 2 && info->vsub == 2;

}



/**

 * drm_format_info_is_yuv_sampling_422 - check that the format info matches a

 * YUV format with 4:2:2 sub-sampling

 * @info: format info

 *

 * Returns:

 * A boolean indicating whether the format info matches a YUV format with 4:2:2

 * sub-sampling.

 */

static inline bool

drm_format_info_is_yuv_sampling_422(const struct drm_format_info *info)

{

	return info->is_yuv && info->hsub == 2 && info->vsub == 1;

}



/**

 * drm_format_info_is_yuv_sampling_444 - check that the format info matches a

 * YUV format with 4:4:4 sub-sampling

 * @info: format info

 *

 * Returns:

 * A boolean indicating whether the format info matches a YUV format with 4:4:4

 * sub-sampling.

 */

static inline bool

drm_format_info_is_yuv_sampling_444(const struct drm_format_info *info)

{

	return info->is_yuv && info->hsub == 1 && info->vsub == 1;

}



const struct drm_format_info *__drm_format_info(u32 format);

const struct drm_format_info *drm_format_info(u32 format);

const struct drm_format_info *

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