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
printable_char(int c)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 */
drm_mode_legacy_fb_format(uint32_t bpp,uint32_t depth)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 */
drm_get_format_name(uint32_t format,struct drm_format_name_buf * buf)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 */
__drm_format_info(u32 format)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 },
116 { .format = DRM_FORMAT_ABGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
117 { .format = DRM_FORMAT_RGBA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
118 { .format = DRM_FORMAT_BGRA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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 },
124 { .format = DRM_FORMAT_ABGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
125 { .format = DRM_FORMAT_RGBA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
126 { .format = DRM_FORMAT_BGRA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
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 },
136 { .format = DRM_FORMAT_BGR565_A8, .depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1 },
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 },
142 { .format = DRM_FORMAT_ABGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
143 { .format = DRM_FORMAT_RGBA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
144 { .format = DRM_FORMAT_BGRA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
145 { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
146 { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
147 { .format = DRM_FORMAT_RGBA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
148 { .format = DRM_FORMAT_BGRA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
149 { .format = DRM_FORMAT_RGB888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1 },
150 { .format = DRM_FORMAT_BGR888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1 },
151 { .format = DRM_FORMAT_XRGB8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1 },
152 { .format = DRM_FORMAT_XBGR8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1 },
153 { .format = DRM_FORMAT_RGBX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1 },
154 { .format = DRM_FORMAT_BGRX8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1 },
155 { .format = DRM_FORMAT_YUV410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
156 { .format = DRM_FORMAT_YVU410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
157 { .format = DRM_FORMAT_YUV411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
158 { .format = DRM_FORMAT_YVU411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
159 { .format = DRM_FORMAT_YUV420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
160 { .format = DRM_FORMAT_YVU420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
161 { .format = DRM_FORMAT_YUV422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
162 { .format = DRM_FORMAT_YVU422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
163 { .format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
164 { .format = DRM_FORMAT_YVU444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
165 { .format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
166 { .format = DRM_FORMAT_NV21, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
167 { .format = DRM_FORMAT_NV16, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
168 { .format = DRM_FORMAT_NV61, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
169 { .format = DRM_FORMAT_NV24, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
170 { .format = DRM_FORMAT_NV42, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
171 { .format = DRM_FORMAT_YUYV, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
172 { .format = DRM_FORMAT_YVYU, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
173 { .format = DRM_FORMAT_UYVY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
174 { .format = DRM_FORMAT_VYUY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
175 { .format = DRM_FORMAT_AYUV, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
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 */
drm_format_info(u32 format)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 *
drm_get_format_info(struct drm_device * dev,const struct drm_mode_fb_cmd2 * mode_cmd)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 */
drm_format_num_planes(uint32_t format)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 */
drm_format_plane_cpp(uint32_t format,int plane)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 */
drm_format_horz_chroma_subsampling(uint32_t format)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 */
drm_format_vert_chroma_subsampling(uint32_t format)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 */
drm_format_plane_width(int width,uint32_t format,int plane)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 */
drm_format_plane_height(int height,uint32_t format,int plane)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);
351