drm/fourcc: Add format info helpers for checking YUV planes disposition (41c8c210) · Commits · 戴 / test

It is often useful to check whether the DRM format info retrieved from the DRM framebuffer matches a specific YUV planes disposition. This introduces helpers to quickly check that a provided format info matches a YUV format with a specific disposition, in commonly-used terminology. The intent of providing helpers taking the format info instead of the fourcc alone is to avoid the overhead of iterating through all formats when the whole format info structure is available. As a result, these helpers are very simple so they are made inline. Signed-off-by:

Paul Kocialkowski <paul.kocialkowski@bootlin.com> Reviewed-by:

Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by:

Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190118145133.21281-2-paul.kocialkowski@bootlin.com

include/drm/drm_fourcc.h

+42 −0

Original line number	Diff line number	Diff line
		@@ -143,6 +143,48 @@ struct drm_format_name_buf {
		char str[32];
		};

		/**
		* drm_format_info_is_yuv_packed - check that the format info matches a YUV
		* format with data laid in a single plane
		* @info: format info
		*
		* Returns:
		* A boolean indicating whether the format info matches a packed YUV format.
		*/
		static inline bool
		drm_format_info_is_yuv_packed(const struct drm_format_info *info)
		{
		return info->is_yuv && info->num_planes == 1;
		}

		/**
		* drm_format_info_is_yuv_semiplanar - check that the format info matches a YUV
		* format with data laid in two planes (luminance and chrominance)
		* @info: format info
		*
		* Returns:
		* A boolean indicating whether the format info matches a semiplanar YUV format.
		*/
		static inline bool
		drm_format_info_is_yuv_semiplanar(const struct drm_format_info *info)
		{
		return info->is_yuv && info->num_planes == 2;
		}

		/**
		* drm_format_info_is_yuv_planar - check that the format info matches a YUV
		* format with data laid in three planes (one for each YUV component)
		* @info: format info
		*
		* Returns:
		* A boolean indicating whether the format info matches a planar YUV format.
		*/
		static inline bool
		drm_format_info_is_yuv_planar(const struct drm_format_info *info)
		{
		return info->is_yuv && info->num_planes == 3;
		}

		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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