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 /**
147 * drm_format_info_is_yuv_packed - check that the format info matches a YUV
148 * format with data laid in a single plane
149 * @info: format info
150 *
151 * Returns:
152 * A boolean indicating whether the format info matches a packed YUV format.
153 */
154 static inline bool
155 drm_format_info_is_yuv_packed(const struct drm_format_info *info)
156 {
157 return info->is_yuv && info->num_planes == 1;
158 }
159
160 /**
161 * drm_format_info_is_yuv_semiplanar - check that the format info matches a YUV
162 * format with data laid in two planes (luminance and chrominance)
163 * @info: format info
164 *
165 * Returns:
166 * A boolean indicating whether the format info matches a semiplanar YUV format.
167 */
168 static inline bool
169 drm_format_info_is_yuv_semiplanar(const struct drm_format_info *info)
170 {
171 return info->is_yuv && info->num_planes == 2;
172 }
173
174 /**
175 * drm_format_info_is_yuv_planar - check that the format info matches a YUV
176 * format with data laid in three planes (one for each YUV component)
177 * @info: format info
178 *
179 * Returns:
180 * A boolean indicating whether the format info matches a planar YUV format.
181 */
182 static inline bool
183 drm_format_info_is_yuv_planar(const struct drm_format_info *info)
184 {
185 return info->is_yuv && info->num_planes == 3;
186 }
187
188 /**
189 * drm_format_info_is_yuv_sampling_410 - check that the format info matches a
190 * YUV format with 4:1:0 sub-sampling
191 * @info: format info
192 *
193 * Returns:
194 * A boolean indicating whether the format info matches a YUV format with 4:1:0
195 * sub-sampling.
196 */
197 static inline bool
198 drm_format_info_is_yuv_sampling_410(const struct drm_format_info *info)
199 {
200 return info->is_yuv && info->hsub == 4 && info->vsub == 4;
201 }
202
203 /**
204 * drm_format_info_is_yuv_sampling_411 - check that the format info matches a
205 * YUV format with 4:1:1 sub-sampling
206 * @info: format info
207 *
208 * Returns:
209 * A boolean indicating whether the format info matches a YUV format with 4:1:1
210 * sub-sampling.
211 */
212 static inline bool
213 drm_format_info_is_yuv_sampling_411(const struct drm_format_info *info)
214 {
215 return info->is_yuv && info->hsub == 4 && info->vsub == 1;
216 }
217
218 /**
219 * drm_format_info_is_yuv_sampling_420 - check that the format info matches a
220 * YUV format with 4:2:0 sub-sampling
221 * @info: format info
222 *
223 * Returns:
224 * A boolean indicating whether the format info matches a YUV format with 4:2:0
225 * sub-sampling.
226 */
227 static inline bool
228 drm_format_info_is_yuv_sampling_420(const struct drm_format_info *info)
229 {
230 return info->is_yuv && info->hsub == 2 && info->vsub == 2;
231 }
232
233 /**
234 * drm_format_info_is_yuv_sampling_422 - check that the format info matches a
235 * YUV format with 4:2:2 sub-sampling
236 * @info: format info
237 *
238 * Returns:
239 * A boolean indicating whether the format info matches a YUV format with 4:2:2
240 * sub-sampling.
241 */
242 static inline bool
243 drm_format_info_is_yuv_sampling_422(const struct drm_format_info *info)
244 {
245 return info->is_yuv && info->hsub == 2 && info->vsub == 1;
246 }
247
248 /**
249 * drm_format_info_is_yuv_sampling_444 - check that the format info matches a
250 * YUV format with 4:4:4 sub-sampling
251 * @info: format info
252 *
253 * Returns:
254 * A boolean indicating whether the format info matches a YUV format with 4:4:4
255 * sub-sampling.
256 */
257 static inline bool
258 drm_format_info_is_yuv_sampling_444(const struct drm_format_info *info)
259 {
260 return info->is_yuv && info->hsub == 1 && info->vsub == 1;
261 }
262
263 /**
264 * drm_format_info_plane_width - width of the plane given the first plane
265 * @info: pixel format info
266 * @width: width of the first plane
267 * @plane: plane index
268 *
269 * Returns:
270 * The width of @plane, given that the width of the first plane is @width.
271 */
272 static inline
273 int drm_format_info_plane_width(const struct drm_format_info *info, int width,
274 int plane)
275 {
276 if (!info || plane >= info->num_planes)
277 return 0;
278
279 if (plane == 0)
280 return width;
281
282 return width / info->hsub;
283 }
284
285 /**
286 * drm_format_info_plane_height - height of the plane given the first plane
287 * @info: pixel format info
288 * @height: height of the first plane
289 * @plane: plane index
290 *
291 * Returns:
292 * The height of @plane, given that the height of the first plane is @height.
293 */
294 static inline
295 int drm_format_info_plane_height(const struct drm_format_info *info, int height,
296 int plane)
297 {
298 if (!info || plane >= info->num_planes)
299 return 0;
300
301 if (plane == 0)
302 return height;
303
304 return height / info->vsub;
305 }
306
307 const struct drm_format_info *__drm_format_info(u32 format);
308 const struct drm_format_info *drm_format_info(u32 format);
309 const struct drm_format_info *
310 drm_get_format_info(struct drm_device *dev,
311 const struct drm_mode_fb_cmd2 *mode_cmd);
312 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
313 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
314 uint32_t bpp, uint32_t depth);
315 unsigned int drm_format_info_block_width(const struct drm_format_info *info,
316 int plane);
317 unsigned int drm_format_info_block_height(const struct drm_format_info *info,
318 int plane);
319 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
320 int plane, unsigned int buffer_width);
321 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf);
322
323 #endif /* __DRM_FOURCC_H__ */