drivers/gpu/drm/drm_fourcc.c

   1 /*
   2  * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   3  *
   4  * DRM core format related functions
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that copyright
   9  * notice and this permission notice appear in supporting documentation, and
  10  * that the name of the copyright holders not be used in advertising or
  11  * publicity pertaining to distribution of the software without specific,
  12  * written prior permission.  The copyright holders make no representations
  13  * about the suitability of this software for any purpose.  It is provided "as
  14  * is" without express or implied warranty.
  15  *
  16  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <linux/bug.h>
  26 #include <linux/ctype.h>
  27 #include <linux/export.h>
  28 #include <linux/kernel.h>
  29
  30 #include <drm/drmP.h>
  31 #include <drm/drm_fourcc.h>
  32
  33 static char printable_char(int c)
  34 {
  35         return isascii(c) && isprint(c) ? c : '?';
  36 }
  37
  38 /**
  39  * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
  40  * @bpp: bits per pixels
  41  * @depth: bit depth per pixel
  42  *
  43  * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
  44  * Useful in fbdev emulation code, since that deals in those values.
  45  */
  46 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
  47 {
  48         uint32_t fmt;
  49
  50         switch (bpp) {
  51         case 8:
  52                 fmt = DRM_FORMAT_C8;
  53                 break;
  54         case 16:
  55                 if (depth == 15)
  56                         fmt = DRM_FORMAT_XRGB1555;
  57                 else
  58                         fmt = DRM_FORMAT_RGB565;
  59                 break;
  60         case 24:
  61                 fmt = DRM_FORMAT_RGB888;
  62                 break;
  63         case 32:
  64                 if (depth == 24)
  65                         fmt = DRM_FORMAT_XRGB8888;
  66                 else if (depth == 30)
  67                         fmt = DRM_FORMAT_XRGB2101010;
  68                 else
  69                         fmt = DRM_FORMAT_ARGB8888;
  70                 break;
  71         default:
  72                 DRM_ERROR("bad bpp, assuming x8r8g8b8 pixel format\n");
  73                 fmt = DRM_FORMAT_XRGB8888;
  74                 break;
  75         }
  76
  77         return fmt;
  78 }
  79 EXPORT_SYMBOL(drm_mode_legacy_fb_format);
  80
  81 /**
  82  * drm_get_format_name - fill a string with a drm fourcc format's name
  83  * @format: format to compute name of
  84  * @buf: caller-supplied buffer
  85  */
  86 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
  87 {
  88         snprintf(buf->str, sizeof(buf->str),
  89                  "%c%c%c%c %s-endian (0x%08x)",
  90                  printable_char(format & 0xff),
  91                  printable_char((format >> 8) & 0xff),
  92                  printable_char((format >> 16) & 0xff),
  93                  printable_char((format >> 24) & 0x7f),
  94                  format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
  95                  format);
  96
  97         return buf->str;
  98 }
  99 EXPORT_SYMBOL(drm_get_format_name);
 100
 101 /*
 102  * Internal function to query information for a given format. See
 103  * drm_format_info() for the public API.
 104  */
 105 const struct drm_format_info *__drm_format_info(u32 format)
 106 {
 107         static const struct drm_format_info formats[] = {
 108                 { .format = DRM_FORMAT_C8,              .depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
 109                 { .format = DRM_FORMAT_RGB332,          .depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
 110                 { .format = DRM_FORMAT_BGR233,          .depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
 111                 { .format = DRM_FORMAT_XRGB4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 112                 { .format = DRM_FORMAT_XBGR4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 113                 { .format = DRM_FORMAT_RGBX4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 114                 { .format = DRM_FORMAT_BGRX4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 115                 { .format = DRM_FORMAT_ARGB4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 116                 { .format = DRM_FORMAT_ABGR4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 117                 { .format = DRM_FORMAT_RGBA4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 118                 { .format = DRM_FORMAT_BGRA4444,        .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 119                 { .format = DRM_FORMAT_XRGB1555,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 120                 { .format = DRM_FORMAT_XBGR1555,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 121                 { .format = DRM_FORMAT_RGBX5551,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 122                 { .format = DRM_FORMAT_BGRX5551,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 123                 { .format = DRM_FORMAT_ARGB1555,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 124                 { .format = DRM_FORMAT_ABGR1555,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 125                 { .format = DRM_FORMAT_RGBA5551,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 126                 { .format = DRM_FORMAT_BGRA5551,        .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 127                 { .format = DRM_FORMAT_RGB565,          .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 128                 { .format = DRM_FORMAT_BGR565,          .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
 129                 { .format = DRM_FORMAT_RGB888,          .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
 130                 { .format = DRM_FORMAT_BGR888,          .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
 131                 { .format = DRM_FORMAT_XRGB8888,        .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 132                 { .format = DRM_FORMAT_XBGR8888,        .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 133                 { .format = DRM_FORMAT_RGBX8888,        .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 134                 { .format = DRM_FORMAT_BGRX8888,        .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 135                 { .format = DRM_FORMAT_RGB565_A8,       .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 136                 { .format = DRM_FORMAT_BGR565_A8,       .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 137                 { .format = DRM_FORMAT_XRGB2101010,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 138                 { .format = DRM_FORMAT_XBGR2101010,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 139                 { .format = DRM_FORMAT_RGBX1010102,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 140                 { .format = DRM_FORMAT_BGRX1010102,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
 141                 { .format = DRM_FORMAT_ARGB2101010,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 142                 { .format = DRM_FORMAT_ABGR2101010,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 143                 { .format = DRM_FORMAT_RGBA1010102,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 144                 { .format = DRM_FORMAT_BGRA1010102,     .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 145                 { .format = DRM_FORMAT_ARGB8888,        .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 146                 { .format = DRM_FORMAT_ABGR8888,        .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 147                 { .format = DRM_FORMAT_RGBA8888,        .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 148                 { .format = DRM_FORMAT_BGRA8888,        .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 149                 { .format = DRM_FORMAT_RGB888_A8,       .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 150                 { .format = DRM_FORMAT_BGR888_A8,       .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 151                 { .format = DRM_FORMAT_XRGB8888_A8,     .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 152                 { .format = DRM_FORMAT_XBGR8888_A8,     .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 153                 { .format = DRM_FORMAT_RGBX8888_A8,     .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 154                 { .format = DRM_FORMAT_BGRX8888_A8,     .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
 155                 { .format = DRM_FORMAT_YUV410,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
 156                 { .format = DRM_FORMAT_YVU410,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
 157                 { .format = DRM_FORMAT_YUV411,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
 158                 { .format = DRM_FORMAT_YVU411,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
 159                 { .format = DRM_FORMAT_YUV420,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
 160                 { .format = DRM_FORMAT_YVU420,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
 161                 { .format = DRM_FORMAT_YUV422,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 162                 { .format = DRM_FORMAT_YVU422,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 163                 { .format = DRM_FORMAT_YUV444,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
 164                 { .format = DRM_FORMAT_YVU444,          .depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
 165                 { .format = DRM_FORMAT_NV12,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
 166                 { .format = DRM_FORMAT_NV21,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
 167                 { .format = DRM_FORMAT_NV16,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 168                 { .format = DRM_FORMAT_NV61,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 169                 { .format = DRM_FORMAT_NV24,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
 170                 { .format = DRM_FORMAT_NV42,            .depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
 171                 { .format = DRM_FORMAT_YUYV,            .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 172                 { .format = DRM_FORMAT_YVYU,            .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 173                 { .format = DRM_FORMAT_UYVY,            .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 174                 { .format = DRM_FORMAT_VYUY,            .depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
 175                 { .format = DRM_FORMAT_AYUV,            .depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
 176         };
 177
 178         unsigned int i;
 179
 180         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 181                 if (formats[i].format == format)
 182                         return &formats[i];
 183         }
 184
 185         return NULL;
 186 }
 187
 188 /**
 189  * drm_format_info - query information for a given format
 190  * @format: pixel format (DRM_FORMAT_*)
 191  *
 192  * The caller should only pass a supported pixel format to this function.
 193  * Unsupported pixel formats will generate a warning in the kernel log.
 194  *
 195  * Returns:
 196  * The instance of struct drm_format_info that describes the pixel format, or
 197  * NULL if the format is unsupported.
 198  */
 199 const struct drm_format_info *drm_format_info(u32 format)
 200 {
 201         const struct drm_format_info *info;
 202
 203         info = __drm_format_info(format);
 204         WARN_ON(!info);
 205         return info;
 206 }
 207 EXPORT_SYMBOL(drm_format_info);
 208
 209 /**
 210  * drm_get_format_info - query information for a given framebuffer configuration
 211  * @dev: DRM device
 212  * @mode_cmd: metadata from the userspace fb creation request
 213  *
 214  * Returns:
 215  * The instance of struct drm_format_info that describes the pixel format, or
 216  * NULL if the format is unsupported.
 217  */
 218 const struct drm_format_info *
 219 drm_get_format_info(struct drm_device *dev,
 220                     const struct drm_mode_fb_cmd2 *mode_cmd)
 221 {
 222         const struct drm_format_info *info = NULL;
 223
 224         if (dev->mode_config.funcs->get_format_info)
 225                 info = dev->mode_config.funcs->get_format_info(mode_cmd);
 226
 227         if (!info)
 228                 info = drm_format_info(mode_cmd->pixel_format);
 229
 230         return info;
 231 }
 232 EXPORT_SYMBOL(drm_get_format_info);
 233
 234 /**
 235  * drm_format_num_planes - get the number of planes for format
 236  * @format: pixel format (DRM_FORMAT_*)
 237  *
 238  * Returns:
 239  * The number of planes used by the specified pixel format.
 240  */
 241 int drm_format_num_planes(uint32_t format)
 242 {
 243         const struct drm_format_info *info;
 244
 245         info = drm_format_info(format);
 246         return info ? info->num_planes : 1;
 247 }
 248 EXPORT_SYMBOL(drm_format_num_planes);
 249
 250 /**
 251  * drm_format_plane_cpp - determine the bytes per pixel value
 252  * @format: pixel format (DRM_FORMAT_*)
 253  * @plane: plane index
 254  *
 255  * Returns:
 256  * The bytes per pixel value for the specified plane.
 257  */
 258 int drm_format_plane_cpp(uint32_t format, int plane)
 259 {
 260         const struct drm_format_info *info;
 261
 262         info = drm_format_info(format);
 263         if (!info || plane >= info->num_planes)
 264                 return 0;
 265
 266         return info->cpp[plane];
 267 }
 268 EXPORT_SYMBOL(drm_format_plane_cpp);
 269
 270 /**
 271  * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
 272  * @format: pixel format (DRM_FORMAT_*)
 273  *
 274  * Returns:
 275  * The horizontal chroma subsampling factor for the
 276  * specified pixel format.
 277  */
 278 int drm_format_horz_chroma_subsampling(uint32_t format)
 279 {
 280         const struct drm_format_info *info;
 281
 282         info = drm_format_info(format);
 283         return info ? info->hsub : 1;
 284 }
 285 EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
 286
 287 /**
 288  * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
 289  * @format: pixel format (DRM_FORMAT_*)
 290  *
 291  * Returns:
 292  * The vertical chroma subsampling factor for the
 293  * specified pixel format.
 294  */
 295 int drm_format_vert_chroma_subsampling(uint32_t format)
 296 {
 297         const struct drm_format_info *info;
 298
 299         info = drm_format_info(format);
 300         return info ? info->vsub : 1;
 301 }
 302 EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
 303
 304 /**
 305  * drm_format_plane_width - width of the plane given the first plane
 306  * @width: width of the first plane
 307  * @format: pixel format
 308  * @plane: plane index
 309  *
 310  * Returns:
 311  * The width of @plane, given that the width of the first plane is @width.
 312  */
 313 int drm_format_plane_width(int width, uint32_t format, int plane)
 314 {
 315         const struct drm_format_info *info;
 316
 317         info = drm_format_info(format);
 318         if (!info || plane >= info->num_planes)
 319                 return 0;
 320
 321         if (plane == 0)
 322                 return width;
 323
 324         return width / info->hsub;
 325 }
 326 EXPORT_SYMBOL(drm_format_plane_width);
 327
 328 /**
 329  * drm_format_plane_height - height of the plane given the first plane
 330  * @height: height of the first plane
 331  * @format: pixel format
 332  * @plane: plane index
 333  *
 334  * Returns:
 335  * The height of @plane, given that the height of the first plane is @height.
 336  */
 337 int drm_format_plane_height(int height, uint32_t format, int plane)
 338 {
 339         const struct drm_format_info *info;
 340
 341         info = drm_format_info(format);
 342         if (!info || plane >= info->num_planes)
 343                 return 0;
 344
 345         if (plane == 0)
 346                 return height;
 347
 348         return height / info->vsub;
 349 }
 350 EXPORT_SYMBOL(drm_format_plane_height);