include/drm/drm_fourcc.h

   1 /*
   2  * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22 #ifndef __DRM_FOURCC_H__
  23 #define __DRM_FOURCC_H__
  24
  25 #include <linux/types.h>
  26 #include <uapi/drm/drm_fourcc.h>
  27
  28 /*
  29  * DRM formats are little endian.  Define host endian variants for the
  30  * most common formats here, to reduce the #ifdefs needed in drivers.
  31  *
  32  * Note that the DRM_FORMAT_BIG_ENDIAN flag should only be used in
  33  * case the format can't be specified otherwise, so we don't end up
  34  * with two values describing the same format.
  35  */
  36 #ifdef __BIG_ENDIAN
  37 # define DRM_FORMAT_HOST_XRGB1555     (DRM_FORMAT_XRGB1555         |    \
  38                                        DRM_FORMAT_BIG_ENDIAN)
  39 # define DRM_FORMAT_HOST_RGB565       (DRM_FORMAT_RGB565           |    \
  40                                        DRM_FORMAT_BIG_ENDIAN)
  41 # define DRM_FORMAT_HOST_XRGB8888     DRM_FORMAT_BGRX8888
  42 # define DRM_FORMAT_HOST_ARGB8888     DRM_FORMAT_BGRA8888
  43 #else
  44 # define DRM_FORMAT_HOST_XRGB1555     DRM_FORMAT_XRGB1555
  45 # define DRM_FORMAT_HOST_RGB565       DRM_FORMAT_RGB565
  46 # define DRM_FORMAT_HOST_XRGB8888     DRM_FORMAT_XRGB8888
  47 # define DRM_FORMAT_HOST_ARGB8888     DRM_FORMAT_ARGB8888
  48 #endif
  49
  50 struct drm_device;
  51 struct drm_mode_fb_cmd2;
  52
  53 /**
  54  * struct drm_format_info - information about a DRM format
  55  */
  56 struct drm_format_info {
  57         /** @format: 4CC format identifier (DRM_FORMAT_*) */
  58         u32 format;
  59
  60         /**
  61          * @depth:
  62          *
  63          * Color depth (number of bits per pixel excluding padding bits),
  64          * valid for a subset of RGB formats only. This is a legacy field, do
  65          * not use in new code and set to 0 for new formats.
  66          */
  67         u8 depth;
  68
  69         /** @num_planes: Number of color planes (1 to 3) */
  70         u8 num_planes;
  71
  72         union {
  73                 /**
  74                  * @cpp:
  75                  *
  76                  * Number of bytes per pixel (per plane), this is aliased with
  77                  * @char_per_block. It is deprecated in favour of using the
  78                  * triplet @char_per_block, @block_w, @block_h for better
  79                  * describing the pixel format.
  80                  */
  81                 u8 cpp[3];
  82
  83                 /**
  84                  * @char_per_block:
  85                  *
  86                  * Number of bytes per block (per plane), where blocks are
  87                  * defined as a rectangle of pixels which are stored next to
  88                  * each other in a byte aligned memory region. Together with
  89                  * @block_w and @block_h this is used to properly describe tiles
  90                  * in tiled formats or to describe groups of pixels in packed
  91                  * formats for which the memory needed for a single pixel is not
  92                  * byte aligned.
  93                  *
  94                  * @cpp has been kept for historical reasons because there are
  95                  * a lot of places in drivers where it's used. In drm core for
  96                  * generic code paths the preferred way is to use
  97                  * @char_per_block, drm_format_info_block_width() and
  98                  * drm_format_info_block_height() which allows handling both
  99                  * block and non-block formats in the same way.
 100                  *
 101                  * For formats that are intended to be used only with non-linear
 102                  * modifiers both @cpp and @char_per_block must be 0 in the
 103                  * generic format table. Drivers could supply accurate
 104                  * information from their drm_mode_config.get_format_info hook
 105                  * if they want the core to be validating the pitch.
 106                  */
 107                 u8 char_per_block[3];
 108         };
 109
 110         /**
 111          * @block_w:
 112          *
 113          * Block width in pixels, this is intended to be accessed through
 114          * drm_format_info_block_width()
 115          */
 116         u8 block_w[3];
 117
 118         /**
 119          * @block_h:
 120          *
 121          * Block height in pixels, this is intended to be accessed through
 122          * drm_format_info_block_height()
 123          */
 124         u8 block_h[3];
 125
 126         /** @hsub: Horizontal chroma subsampling factor */
 127         u8 hsub;
 128         /** @vsub: Vertical chroma subsampling factor */
 129         u8 vsub;
 130
 131         /** @has_alpha: Does the format embeds an alpha component? */
 132         bool has_alpha;
 133
 134         /** @is_yuv: Is it a YUV format? */
 135         bool is_yuv;
 136 };
 137
 138 /**
 139  * struct drm_format_name_buf - name of a DRM format
 140  * @str: string buffer containing the format name
 141  */
 142 struct drm_format_name_buf {
 143         char str[32];
 144 };
 145
 146 const struct drm_format_info *__drm_format_info(u32 format);
 147 const struct drm_format_info *drm_format_info(u32 format);
 148 const struct drm_format_info *
 149 drm_get_format_info(struct drm_device *dev,
 150                     const struct drm_mode_fb_cmd2 *mode_cmd);
 151 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
 152 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
 153                                      uint32_t bpp, uint32_t depth);
 154 int drm_format_num_planes(uint32_t format);
 155 int drm_format_plane_cpp(uint32_t format, int plane);
 156 int drm_format_horz_chroma_subsampling(uint32_t format);
 157 int drm_format_vert_chroma_subsampling(uint32_t format);
 158 int drm_format_plane_width(int width, uint32_t format, int plane);
 159 int drm_format_plane_height(int height, uint32_t format, int plane);
 160 unsigned int drm_format_info_block_width(const struct drm_format_info *info,
 161                                          int plane);
 162 unsigned int drm_format_info_block_height(const struct drm_format_info *info,
 163                                           int plane);
 164 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
 165                                    int plane, unsigned int buffer_width);
 166 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
 167
 168 #endif /* __DRM_FOURCC_H__ */