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/*
* 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];
};
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);
int drm_format_num_planes(uint32_t format);
int drm_format_plane_cpp(uint32_t format, int plane);
int drm_format_horz_chroma_subsampling(uint32_t format);
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);
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__ */
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