include/drm/drm_fourcc.h - linux - Git at Google

 /*
  * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
  * the above copyright notice appear in all copies and that both that copyright
  * notice and this permission notice appear in supporting documentation, and
  * that the name of the copyright holders not be used in advertising or
  * publicity pertaining to distribution of the software without specific,
  * written prior permission.  The copyright holders make no representations
  * about the suitability of this software for any purpose.  It is provided "as
  * is" without express or implied warranty.
  *
  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  * OF THIS SOFTWARE.
  */
 #ifndef __DRM_FOURCC_H__
 #define __DRM_FOURCC_H__

 #include <linux/types.h>
 #include <uapi/drm/drm_fourcc.h>

 /*
  * DRM formats are little endian.  Define host endian variants for the
  * most common formats here, to reduce the #ifdefs needed in drivers.
  *
  * Note that the DRM_FORMAT_BIG_ENDIAN flag should only be used in
  * case the format can't be specified otherwise, so we don't end up
  * with two values describing the same format.
  */
 #ifdef __BIG_ENDIAN
 # define DRM_FORMAT_HOST_XRGB1555     (DRM_FORMAT_XRGB1555         |	\
 				       DRM_FORMAT_BIG_ENDIAN)
 # define DRM_FORMAT_HOST_RGB565       (DRM_FORMAT_RGB565           |	\
 				       DRM_FORMAT_BIG_ENDIAN)
 # define DRM_FORMAT_HOST_XRGB8888     DRM_FORMAT_BGRX8888
 # define DRM_FORMAT_HOST_ARGB8888     DRM_FORMAT_BGRA8888
 #else
 # define DRM_FORMAT_HOST_XRGB1555     DRM_FORMAT_XRGB1555
 # define DRM_FORMAT_HOST_RGB565       DRM_FORMAT_RGB565
 # define DRM_FORMAT_HOST_XRGB8888     DRM_FORMAT_XRGB8888
 # define DRM_FORMAT_HOST_ARGB8888     DRM_FORMAT_ARGB8888
 #endif

 struct drm_device;
 struct drm_mode_fb_cmd2;

 /**
  * struct drm_format_info - information about a DRM format
  */
 struct drm_format_info {
 	/** @format: 4CC format identifier (DRM_FORMAT_*) */
 	u32 format;

 	/**
 	 * @depth:
 	 *
 	 * Color depth (number of bits per pixel excluding padding bits),
 	 * valid for a subset of RGB formats only. This is a legacy field, do
 	 * not use in new code and set to 0 for new formats.
 	 */
 	u8 depth;

 	/** @num_planes: Number of color planes (1 to 3) */
 	u8 num_planes;

 	union {
 		/**
 		 * @cpp:
 		 *
 		 * Number of bytes per pixel (per plane), this is aliased with
 		 * @char_per_block. It is deprecated in favour of using the
 		 * triplet @char_per_block, @block_w, @block_h for better
 		 * describing the pixel format.
 		 */
 		u8 cpp[3];

 		/**
 		 * @char_per_block:
 		 *
 		 * Number of bytes per block (per plane), where blocks are
 		 * defined as a rectangle of pixels which are stored next to
 		 * each other in a byte aligned memory region. Together with
 		 * @block_w and @block_h this is used to properly describe tiles
 		 * in tiled formats or to describe groups of pixels in packed
 		 * formats for which the memory needed for a single pixel is not
 		 * byte aligned.
 		 *
 		 * @cpp has been kept for historical reasons because there are
 		 * a lot of places in drivers where it's used. In drm core for
 		 * generic code paths the preferred way is to use
 		 * @char_per_block, drm_format_info_block_width() and
 		 * drm_format_info_block_height() which allows handling both
 		 * block and non-block formats in the same way.
 		 *
 		 * For formats that are intended to be used only with non-linear
 		 * modifiers both @cpp and @char_per_block must be 0 in the
 		 * generic format table. Drivers could supply accurate
 		 * information from their drm_mode_config.get_format_info hook
 		 * if they want the core to be validating the pitch.
 		 */
 		u8 char_per_block[3];
 	};

 	/**
 	 * @block_w:
 	 *
 	 * Block width in pixels, this is intended to be accessed through
 	 * drm_format_info_block_width()
 	 */
 	u8 block_w[3];

 	/**
 	 * @block_h:
 	 *
 	 * Block height in pixels, this is intended to be accessed through
 	 * drm_format_info_block_height()
 	 */
 	u8 block_h[3];

 	/** @hsub: Horizontal chroma subsampling factor */
 	u8 hsub;
 	/** @vsub: Vertical chroma subsampling factor */
 	u8 vsub;

 	/** @has_alpha: Does the format embeds an alpha component? */
 	bool has_alpha;

 	/** @is_yuv: Is it a YUV format? */
 	bool is_yuv;
 };

 /**
  * struct drm_format_name_buf - name of a DRM format
  * @str: string buffer containing the format name
  */
 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;
 }

 /**
  * 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;
 }

 /**
  * drm_format_info_plane_width - width of the plane given the first plane
  * @info: pixel format info
  * @width: width of the first plane
  * @plane: plane index
  *
  * Returns:
  * The width of @plane, given that the width of the first plane is @width.
  */
 static inline
 int drm_format_info_plane_width(const struct drm_format_info *info, int width,
 				int plane)
 {
 	if (!info || plane >= info->num_planes)
 		return 0;

 	if (plane == 0)
 		return width;

 	return width / info->hsub;
 }

 /**
  * drm_format_info_plane_height - height of the plane given the first plane
  * @info: pixel format info
  * @height: height of the first plane
  * @plane: plane index
  *
  * Returns:
  * The height of @plane, given that the height of the first plane is @height.
  */
 static inline
 int drm_format_info_plane_height(const struct drm_format_info *info, int height,
 				 int plane)
 {
 	if (!info || plane >= info->num_planes)
 		return 0;

 	if (plane == 0)
 		return height;

 	return height / info->vsub;
 }

 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 *
 drm_get_format_info(struct drm_device *dev,
 		    const struct drm_mode_fb_cmd2 *mode_cmd);
 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
 				     uint32_t bpp, uint32_t depth);
 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,
 					  int plane);
 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
 				   int plane, unsigned int buffer_width);
 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);

 #endif /* __DRM_FOURCC_H__ */
	/*
	* Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
	*
	* Permission to use, copy, modify, distribute, and sell this software and its
	* documentation for any purpose is hereby granted without fee, provided that
	* the above copyright notice appear in all copies and that both that copyright
	* notice and this permission notice appear in supporting documentation, and
	* that the name of the copyright holders not be used in advertising or
	* publicity pertaining to distribution of the software without specific,
	* written prior permission. The copyright holders make no representations
	* about the suitability of this software for any purpose. It is provided "as
	* is" without express or implied warranty.
	*
	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	* OF THIS SOFTWARE.
	*/
	#ifndef __DRM_FOURCC_H__
	#define __DRM_FOURCC_H__

	#include <linux/types.h>
	#include <uapi/drm/drm_fourcc.h>

	/*
	* DRM formats are little endian. Define host endian variants for the
	* most common formats here, to reduce the #ifdefs needed in drivers.
	*
	* Note that the DRM_FORMAT_BIG_ENDIAN flag should only be used in
	* case the format can't be specified otherwise, so we don't end up
	* with two values describing the same format.
	*/
	#ifdef __BIG_ENDIAN
	# define DRM_FORMAT_HOST_XRGB1555 (DRM_FORMAT_XRGB1555 \| \
	DRM_FORMAT_BIG_ENDIAN)
	# define DRM_FORMAT_HOST_RGB565 (DRM_FORMAT_RGB565 \| \
	DRM_FORMAT_BIG_ENDIAN)
	# define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_BGRX8888
	# define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_BGRA8888
	#else
	# define DRM_FORMAT_HOST_XRGB1555 DRM_FORMAT_XRGB1555
	# define DRM_FORMAT_HOST_RGB565 DRM_FORMAT_RGB565
	# define DRM_FORMAT_HOST_XRGB8888 DRM_FORMAT_XRGB8888
	# define DRM_FORMAT_HOST_ARGB8888 DRM_FORMAT_ARGB8888
	#endif

	struct drm_device;
	struct drm_mode_fb_cmd2;

	/**
	* struct drm_format_info - information about a DRM format
	*/
	struct drm_format_info {
	/** @format: 4CC format identifier (DRM_FORMAT_) /
	u32 format;

	/**
	* @depth:
	*
	* Color depth (number of bits per pixel excluding padding bits),
	* valid for a subset of RGB formats only. This is a legacy field, do
	* not use in new code and set to 0 for new formats.
	*/
	u8 depth;

	/** @num_planes: Number of color planes (1 to 3) */
	u8 num_planes;

	union {
	/**
	* @cpp:
	*
	* Number of bytes per pixel (per plane), this is aliased with
	* @char_per_block. It is deprecated in favour of using the
	* triplet @char_per_block, @block_w, @block_h for better
	* describing the pixel format.
	*/
	u8 cpp[3];

	/**
	* @char_per_block:
	*
	* Number of bytes per block (per plane), where blocks are
	* defined as a rectangle of pixels which are stored next to
	* each other in a byte aligned memory region. Together with
	* @block_w and @block_h this is used to properly describe tiles
	* in tiled formats or to describe groups of pixels in packed
	* formats for which the memory needed for a single pixel is not
	* byte aligned.
	*
	* @cpp has been kept for historical reasons because there are
	* a lot of places in drivers where it's used. In drm core for
	* generic code paths the preferred way is to use
	* @char_per_block, drm_format_info_block_width() and
	* drm_format_info_block_height() which allows handling both
	* block and non-block formats in the same way.
	*
	* For formats that are intended to be used only with non-linear
	* modifiers both @cpp and @char_per_block must be 0 in the
	* generic format table. Drivers could supply accurate
	* information from their drm_mode_config.get_format_info hook
	* if they want the core to be validating the pitch.
	*/
	u8 char_per_block[3];
	};

	/**
	* @block_w:
	*
	* Block width in pixels, this is intended to be accessed through
	* drm_format_info_block_width()
	*/
	u8 block_w[3];

	/**
	* @block_h:
	*
	* Block height in pixels, this is intended to be accessed through
	* drm_format_info_block_height()
	*/
	u8 block_h[3];

	/** @hsub: Horizontal chroma subsampling factor */
	u8 hsub;
	/** @vsub: Vertical chroma subsampling factor */
	u8 vsub;

	/** @has_alpha: Does the format embeds an alpha component? */
	bool has_alpha;

	/** @is_yuv: Is it a YUV format? */
	bool is_yuv;
	};

	/**
	* struct drm_format_name_buf - name of a DRM format
	* @str: string buffer containing the format name
	*/
	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;
	}

	/**
	* 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;
	}

	/**
	* drm_format_info_plane_width - width of the plane given the first plane
	* @info: pixel format info
	* @width: width of the first plane
	* @plane: plane index
	*
	* Returns:
	* The width of @plane, given that the width of the first plane is @width.
	*/
	static inline
	int drm_format_info_plane_width(const struct drm_format_info *info, int width,
	int plane)
	{
	if (!info \|\| plane >= info->num_planes)
	return 0;

	if (plane == 0)
	return width;

	return width / info->hsub;
	}

	/**
	* drm_format_info_plane_height - height of the plane given the first plane
	* @info: pixel format info
	* @height: height of the first plane
	* @plane: plane index
	*
	* Returns:
	* The height of @plane, given that the height of the first plane is @height.
	*/
	static inline
	int drm_format_info_plane_height(const struct drm_format_info *info, int height,
	int plane)
	{
	if (!info \|\| plane >= info->num_planes)
	return 0;

	if (plane == 0)
	return height;

	return height / info->vsub;
	}

	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 *
	drm_get_format_info(struct drm_device *dev,
	const struct drm_mode_fb_cmd2 *mode_cmd);
	uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
	uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
	uint32_t bpp, uint32_t depth);
	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,
	int plane);
	uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
	int plane, unsigned int buffer_width);
	const char drm_get_format_name(uint32_t format, struct drm_format_name_buf buf);

	#endif /* __DRM_FOURCC_H__ */