2 * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
4 * DRM core format related functions
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.
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
25 #include <linux/bug.h>
26 #include <linux/ctype.h>
27 #include <linux/export.h>
28 #include <linux/kernel.h>
31 #include <drm/drm_fourcc.h>
33 static char printable_char(int c)
35 return isascii(c) && isprint(c) ? c : '?';
39 * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
40 * @bpp: bits per pixels
41 * @depth: bit depth per pixel
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.
46 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
48 uint32_t fmt = DRM_FORMAT_INVALID;
59 fmt = DRM_FORMAT_XRGB1555;
62 fmt = DRM_FORMAT_RGB565;
71 fmt = DRM_FORMAT_RGB888;
77 fmt = DRM_FORMAT_XRGB8888;
80 fmt = DRM_FORMAT_XRGB2101010;
83 fmt = DRM_FORMAT_ARGB8888;
96 EXPORT_SYMBOL(drm_mode_legacy_fb_format);
99 * drm_get_format_name - fill a string with a drm fourcc format's name
100 * @format: format to compute name of
101 * @buf: caller-supplied buffer
103 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
105 snprintf(buf->str, sizeof(buf->str),
106 "%c%c%c%c %s-endian (0x%08x)",
107 printable_char(format & 0xff),
108 printable_char((format >> 8) & 0xff),
109 printable_char((format >> 16) & 0xff),
110 printable_char((format >> 24) & 0x7f),
111 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
116 EXPORT_SYMBOL(drm_get_format_name);
119 * Internal function to query information for a given format. See
120 * drm_format_info() for the public API.
122 const struct drm_format_info *__drm_format_info(u32 format)
124 static const struct drm_format_info formats[] = {
125 { .format = DRM_FORMAT_C8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
126 { .format = DRM_FORMAT_RGB332, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
127 { .format = DRM_FORMAT_BGR233, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
128 { .format = DRM_FORMAT_XRGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
129 { .format = DRM_FORMAT_XBGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
130 { .format = DRM_FORMAT_RGBX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
131 { .format = DRM_FORMAT_BGRX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
132 { .format = DRM_FORMAT_ARGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
133 { .format = DRM_FORMAT_ABGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
134 { .format = DRM_FORMAT_RGBA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
135 { .format = DRM_FORMAT_BGRA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
136 { .format = DRM_FORMAT_XRGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
137 { .format = DRM_FORMAT_XBGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
138 { .format = DRM_FORMAT_RGBX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
139 { .format = DRM_FORMAT_BGRX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
140 { .format = DRM_FORMAT_ARGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
141 { .format = DRM_FORMAT_ABGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
142 { .format = DRM_FORMAT_RGBA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
143 { .format = DRM_FORMAT_BGRA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
144 { .format = DRM_FORMAT_RGB565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
145 { .format = DRM_FORMAT_BGR565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
146 { .format = DRM_FORMAT_RGB888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
147 { .format = DRM_FORMAT_BGR888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
148 { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
149 { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
150 { .format = DRM_FORMAT_RGBX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
151 { .format = DRM_FORMAT_BGRX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
152 { .format = DRM_FORMAT_RGB565_A8, .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
153 { .format = DRM_FORMAT_BGR565_A8, .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
154 { .format = DRM_FORMAT_XRGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
155 { .format = DRM_FORMAT_XBGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
156 { .format = DRM_FORMAT_RGBX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
157 { .format = DRM_FORMAT_BGRX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
158 { .format = DRM_FORMAT_ARGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
159 { .format = DRM_FORMAT_ABGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
160 { .format = DRM_FORMAT_RGBA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
161 { .format = DRM_FORMAT_BGRA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
162 { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
163 { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
164 { .format = DRM_FORMAT_RGBA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
165 { .format = DRM_FORMAT_BGRA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
166 { .format = DRM_FORMAT_RGB888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
167 { .format = DRM_FORMAT_BGR888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
168 { .format = DRM_FORMAT_XRGB8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
169 { .format = DRM_FORMAT_XBGR8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
170 { .format = DRM_FORMAT_RGBX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
171 { .format = DRM_FORMAT_BGRX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
172 { .format = DRM_FORMAT_YUV410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
173 { .format = DRM_FORMAT_YVU410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
174 { .format = DRM_FORMAT_YUV411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
175 { .format = DRM_FORMAT_YVU411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
176 { .format = DRM_FORMAT_YUV420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
177 { .format = DRM_FORMAT_YVU420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
178 { .format = DRM_FORMAT_YUV422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
179 { .format = DRM_FORMAT_YVU422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
180 { .format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
181 { .format = DRM_FORMAT_YVU444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
182 { .format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
183 { .format = DRM_FORMAT_NV21, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
184 { .format = DRM_FORMAT_NV16, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
185 { .format = DRM_FORMAT_NV61, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
186 { .format = DRM_FORMAT_NV24, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
187 { .format = DRM_FORMAT_NV42, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
188 { .format = DRM_FORMAT_YUYV, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
189 { .format = DRM_FORMAT_YVYU, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
190 { .format = DRM_FORMAT_UYVY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
191 { .format = DRM_FORMAT_VYUY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
192 { .format = DRM_FORMAT_AYUV, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
197 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
198 if (formats[i].format == format)
206 * drm_format_info - query information for a given format
207 * @format: pixel format (DRM_FORMAT_*)
209 * The caller should only pass a supported pixel format to this function.
210 * Unsupported pixel formats will generate a warning in the kernel log.
213 * The instance of struct drm_format_info that describes the pixel format, or
214 * NULL if the format is unsupported.
216 const struct drm_format_info *drm_format_info(u32 format)
218 const struct drm_format_info *info;
220 info = __drm_format_info(format);
224 EXPORT_SYMBOL(drm_format_info);
227 * drm_get_format_info - query information for a given framebuffer configuration
229 * @mode_cmd: metadata from the userspace fb creation request
232 * The instance of struct drm_format_info that describes the pixel format, or
233 * NULL if the format is unsupported.
235 const struct drm_format_info *
236 drm_get_format_info(struct drm_device *dev,
237 const struct drm_mode_fb_cmd2 *mode_cmd)
239 const struct drm_format_info *info = NULL;
241 if (dev->mode_config.funcs->get_format_info)
242 info = dev->mode_config.funcs->get_format_info(mode_cmd);
245 info = drm_format_info(mode_cmd->pixel_format);
249 EXPORT_SYMBOL(drm_get_format_info);
252 * drm_format_num_planes - get the number of planes for format
253 * @format: pixel format (DRM_FORMAT_*)
256 * The number of planes used by the specified pixel format.
258 int drm_format_num_planes(uint32_t format)
260 const struct drm_format_info *info;
262 info = drm_format_info(format);
263 return info ? info->num_planes : 1;
265 EXPORT_SYMBOL(drm_format_num_planes);
268 * drm_format_plane_cpp - determine the bytes per pixel value
269 * @format: pixel format (DRM_FORMAT_*)
270 * @plane: plane index
273 * The bytes per pixel value for the specified plane.
275 int drm_format_plane_cpp(uint32_t format, int plane)
277 const struct drm_format_info *info;
279 info = drm_format_info(format);
280 if (!info || plane >= info->num_planes)
283 return info->cpp[plane];
285 EXPORT_SYMBOL(drm_format_plane_cpp);
288 * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
289 * @format: pixel format (DRM_FORMAT_*)
292 * The horizontal chroma subsampling factor for the
293 * specified pixel format.
295 int drm_format_horz_chroma_subsampling(uint32_t format)
297 const struct drm_format_info *info;
299 info = drm_format_info(format);
300 return info ? info->hsub : 1;
302 EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
305 * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
306 * @format: pixel format (DRM_FORMAT_*)
309 * The vertical chroma subsampling factor for the
310 * specified pixel format.
312 int drm_format_vert_chroma_subsampling(uint32_t format)
314 const struct drm_format_info *info;
316 info = drm_format_info(format);
317 return info ? info->vsub : 1;
319 EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
322 * drm_format_plane_width - width of the plane given the first plane
323 * @width: width of the first plane
324 * @format: pixel format
325 * @plane: plane index
328 * The width of @plane, given that the width of the first plane is @width.
330 int drm_format_plane_width(int width, uint32_t format, int plane)
332 const struct drm_format_info *info;
334 info = drm_format_info(format);
335 if (!info || plane >= info->num_planes)
341 return width / info->hsub;
343 EXPORT_SYMBOL(drm_format_plane_width);
346 * drm_format_plane_height - height of the plane given the first plane
347 * @height: height of the first plane
348 * @format: pixel format
349 * @plane: plane index
352 * The height of @plane, given that the height of the first plane is @height.
354 int drm_format_plane_height(int height, uint32_t format, int plane)
356 const struct drm_format_info *info;
358 info = drm_format_info(format);
359 if (!info || plane >= info->num_planes)
365 return height / info->vsub;
367 EXPORT_SYMBOL(drm_format_plane_height);