FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/imgutils.c
Date: 2025-11-02 12:19:36
Exec Total Coverage
Lines: 310 372 83.3%
Functions: 21 23 91.3%
Branches: 262 342 76.6%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * misc image utilities
22 */
23
24 #include "avassert.h"
25 #include "common.h"
26 #include "imgutils.h"
27 #include "imgutils_internal.h"
28 #include "intreadwrite.h"
29 #include "log.h"
30 #include "mathematics.h"
31 #include "mem.h"
32 #include "pixdesc.h"
33 #include "rational.h"
34
35 694461 void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
36 const AVPixFmtDescriptor *pixdesc)
37 {
38 int i;
39 694461 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
40
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 694461 if (max_pixstep_comps)
41 693782 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
42
43
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 3472305 for (i = 0; i < 4; i++) {
44 2777844 const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
45
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 2777844 if (comp->step > max_pixsteps[comp->plane]) {
46 1900944 max_pixsteps[comp->plane] = comp->step;
47
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 1900944 if (max_pixstep_comps)
48 1899319 max_pixstep_comps[comp->plane] = i;
49 }
50 }
51 694461 }
52
53 static inline
54 1963517 int image_get_linesize(int width, int plane,
55 int max_step, int max_step_comp,
56 const AVPixFmtDescriptor *desc)
57 {
58 int s, shifted_w, linesize;
59
60
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 1963517 if (!desc)
61 ✗ return AVERROR(EINVAL);
62
63
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 1963517 if (width < 0)
64 ✗ return AVERROR(EINVAL);
65
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 1963517 s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
66 1963517 shifted_w = ((width + (1 << s) - 1)) >> s;
67
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 1963517 if (shifted_w && max_step > INT_MAX / shifted_w)
68 ✗ return AVERROR(EINVAL);
69 1963517 linesize = max_step * shifted_w;
70
71
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 1963517 if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
72 5986 linesize = (linesize + 7) >> 3;
73 1963517 return linesize;
74 }
75
76 897843 int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
77 {
78 897843 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
79 int max_step [4]; /* max pixel step for each plane */
80 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
81
82
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 897843 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
83 627306 return AVERROR(EINVAL);
84
85 270537 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
86 270537 return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
87 }
88
89 423245 int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
90 {
91 int i, ret;
92 423245 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
93 int max_step [4]; /* max pixel step for each plane */
94 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
95
96 423245 memset(linesizes, 0, 4*sizeof(linesizes[0]));
97
98
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 423245 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
99 ✗ return AVERROR(EINVAL);
100
101 423245 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
102
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 2116225 for (i = 0; i < 4; i++) {
103
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 1692980 if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
104 ✗ return ret;
105 1692980 linesizes[i] = ret;
106 }
107
108 423245 return 0;
109 }
110
111 300570 int av_image_fill_plane_sizes(size_t sizes[4], enum AVPixelFormat pix_fmt,
112 int height, const ptrdiff_t linesizes[4])
113 {
114 300570 int i, has_plane[4] = { 0 };
115
116 300570 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
117 300570 memset(sizes , 0, sizeof(sizes[0])*4);
118
119
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 300570 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
120 ✗ return AVERROR(EINVAL);
121
122
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 300570 if (linesizes[0] > SIZE_MAX / height)
123 ✗ return AVERROR(EINVAL);
124 300570 sizes[0] = linesizes[0] * (size_t)height;
125
126
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 300570 if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
127 1059 sizes[1] = 256 * 4; /* palette is stored here as 256 32 bits words */
128 1059 return 0;
129 }
130
131
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 1497555 for (i = 0; i < 4; i++)
132 1198044 has_plane[desc->comp[i].plane] = 1;
133
134
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 793406 for (i = 1; i < 4 && has_plane[i]; i++) {
135
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 493895 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
136 493895 h = (height + (1 << s) - 1) >> s;
137
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 493895 if (linesizes[i] > SIZE_MAX / h)
138 ✗ return AVERROR(EINVAL);
139 493895 sizes[i] = (size_t)h * linesizes[i];
140 }
141
142 299511 return 0;
143 }
144
145 25916 int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
146 uint8_t *ptr, const int linesizes[4])
147 {
148 int i, ret;
149 ptrdiff_t linesizes1[4];
150 size_t sizes[4];
151
152 25916 memset(data , 0, sizeof(data[0])*4);
153
154
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 129580 for (i = 0; i < 4; i++)
155 103664 linesizes1[i] = linesizes[i];
156
157 25916 ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, linesizes1);
158
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 25916 if (ret < 0)
159 ✗ return ret;
160
161 25916 ret = 0;
162
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163
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 103664 if (sizes[i] > INT_MAX - ret)
164 ✗ return AVERROR(EINVAL);
165 103664 ret += sizes[i];
166 }
167
168
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 25916 if (!ptr)
169 ✗ return ret;
170
171 25916 data[0] = ptr;
172
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 72937 for (i = 1; i < 4 && sizes[i]; i++)
173 47021 data[i] = data[i - 1] + sizes[i - 1];
174
175 25916 return ret;
176 }
177
178 1603 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
179 {
180 int i;
181
182
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 388419 for (i = 0; i < 256; i++) {
183 int r, g, b;
184
185
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 386908 switch (pix_fmt) {
186 3840 case AV_PIX_FMT_RGB8:
187 3840 r = (i>>5 )*36;
188 3840 g = ((i>>2)&7)*36;
189 3840 b = (i&3 )*85;
190 3840 break;
191 375552 case AV_PIX_FMT_BGR8:
192 375552 b = (i>>6 )*85;
193 375552 g = ((i>>3)&7)*36;
194 375552 r = (i&7 )*36;
195 375552 break;
196 3584 case AV_PIX_FMT_RGB4_BYTE:
197 3584 r = (i>>3 )*255;
198 3584 g = ((i>>1)&3)*85;
199 3584 b = (i&1 )*255;
200 3584 break;
201 256 case AV_PIX_FMT_BGR4_BYTE:
202 256 b = (i>>3 )*255;
203 256 g = ((i>>1)&3)*85;
204 256 r = (i&1 )*255;
205 256 break;
206 3584 case AV_PIX_FMT_GRAY8:
207 3584 r = b = g = i;
208 3584 break;
209 92 default:
210 92 return AVERROR(EINVAL);
211 }
212 386816 pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24);
213 }
214
215 1511 return 0;
216 }
217
218 394 int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
219 int w, int h, enum AVPixelFormat pix_fmt, int align)
220 {
221 394 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
222 int i, ret;
223 ptrdiff_t linesizes1[4];
224 size_t total_size, sizes[4];
225 uint8_t *buf;
226
227
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 394 if (!desc)
228 ✗ return AVERROR(EINVAL);
229
230
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 394 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
231 ✗ return ret;
232
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 394 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
233 ✗ return ret;
234
235
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 1970 for (i = 0; i < 4; i++) {
236 1576 linesizes[i] = FFALIGN(linesizes[i], align);
237 1576 linesizes1[i] = linesizes[i];
238 }
239
240
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 394 if ((ret = av_image_fill_plane_sizes(sizes, pix_fmt, h, linesizes1)) < 0)
241 ✗ return ret;
242 394 total_size = align;
243
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 1970 for (i = 0; i < 4; i++) {
244
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 1576 if (total_size > SIZE_MAX - sizes[i])
245 ✗ return AVERROR(EINVAL);
246 1576 total_size += sizes[i];
247 }
248 394 buf = av_malloc(total_size);
249
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 394 if (!buf)
250 ✗ return AVERROR(ENOMEM);
251
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 394 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
252 ✗ av_free(buf);
253 ✗ return ret;
254 }
255
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 394 if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
256 1 avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
257
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 1 if (align < 4) {
258 ✗ av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n");
259 ✗ av_free(buf);
260 ✗ return AVERROR(EINVAL);
261 }
262 }
263
264
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 394 if (desc->flags & AV_PIX_FMT_FLAG_PAL && pointers[1] &&
265
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 1 pointers[1] - pointers[0] > linesizes[0] * h) {
266 /* zero-initialize the padding before the palette */
267 ✗ memset(pointers[0] + linesizes[0] * h, 0,
268 ✗ pointers[1] - pointers[0] - linesizes[0] * h);
269 }
270
271 394 return ret;
272 }
273
274 typedef struct ImgUtils {
275 const AVClass *class;
276 int log_offset;
277 void *log_ctx;
278 } ImgUtils;
279
280 static const AVClass imgutils_class = {
281 .class_name = "IMGUTILS",
282 .item_name = av_default_item_name,
283 .option = NULL,
284 .version = LIBAVUTIL_VERSION_INT,
285 .log_level_offset_offset = offsetof(ImgUtils, log_offset),
286 .parent_log_context_offset = offsetof(ImgUtils, log_ctx),
287 };
288
289 668429 int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
290 {
291 668429 ImgUtils imgutils = {
292 .class = &imgutils_class,
293 .log_offset = log_offset,
294 .log_ctx = log_ctx,
295 };
296 668429 int64_t stride = av_image_get_linesize(pix_fmt, w, 0);
297
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 668429 if (stride <= 0)
298 627306 stride = 8LL*w;
299 668429 stride += 128*8;
300
301
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 668429 if (w==0 || h==0 || w > INT32_MAX || h > INT32_MAX || stride >= INT_MAX || stride*(h + 128ULL) >= INT_MAX) {
302 2160 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
303 2160 return AVERROR(EINVAL);
304 }
305
306
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 666269 if (max_pixels < INT64_MAX) {
307
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 267087 if (w*(int64_t)h > max_pixels) {
308 ✗ av_log(&imgutils, AV_LOG_ERROR,
309 "Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n",
310 w, h, max_pixels);
311 ✗ return AVERROR(EINVAL);
312 }
313 }
314
315 666269 return 0;
316 }
317
318 360410 int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
319 {
320 360410 return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx);
321 }
322
323 154846 int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
324 {
325 int64_t scaled_dim;
326
327
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 154846 if (sar.den <= 0 || sar.num < 0)
328 5 return AVERROR(EINVAL);
329
330
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 154841 if (!sar.num || sar.num == sar.den)
331 145853 return 0;
332
333
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 8988 if (sar.num < sar.den)
334 2570 scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO);
335 else
336 6418 scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO);
337
338
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 8988 if (scaled_dim > 0)
339 8988 return 0;
340
341 ✗ return AVERROR(EINVAL);
342 }
343
344 2117937 static void image_copy_plane(uint8_t *dst, ptrdiff_t dst_linesize,
345 const uint8_t *src, ptrdiff_t src_linesize,
346 ptrdiff_t bytewidth, int height)
347 {
348
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 2117937 if (!dst || !src)
349 ✗ return;
350
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 2117937 av_assert0(FFABS(src_linesize) >= bytewidth);
351
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 2117937 av_assert0(FFABS(dst_linesize) >= bytewidth);
352
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 89412591 for (;height > 0; height--) {
353 87294654 memcpy(dst, src, bytewidth);
354 87294654 dst += dst_linesize;
355 87294654 src += src_linesize;
356 }
357 }
358
359 ✗ void av_image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
360 const uint8_t *src, ptrdiff_t src_linesize,
361 ptrdiff_t bytewidth, int height)
362 {
363 ✗ int ret = -1;
364
365 #if ARCH_X86
366 ✗ ret = ff_image_copy_plane_uc_from_x86(dst, dst_linesize, src, src_linesize,
367 bytewidth, height);
368 #endif
369
370 ✗ if (ret < 0)
371 ✗ image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
372 ✗ }
373
374 1887997 void av_image_copy_plane(uint8_t *dst, int dst_linesize,
375 const uint8_t *src, int src_linesize,
376 int bytewidth, int height)
377 {
378 1887997 image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
379 1887997 }
380
381 81188 static void image_copy(uint8_t *const dst_data[4], const ptrdiff_t dst_linesizes[4],
382 const uint8_t *const src_data[4], const ptrdiff_t src_linesizes[4],
383 enum AVPixelFormat pix_fmt, int width, int height,
384 void (*copy_plane)(uint8_t *, ptrdiff_t, const uint8_t *,
385 ptrdiff_t, ptrdiff_t, int))
386 {
387 81188 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
388
389
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 81188 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
390 ✗ return;
391
392
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 81188 if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
393 2273 copy_plane(dst_data[0], dst_linesizes[0],
394 src_data[0], src_linesizes[0],
395 width, height);
396 /* copy the palette */
397
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 2273 if ((desc->flags & AV_PIX_FMT_FLAG_PAL) || (dst_data[1] && src_data[1]))
398 2273 memcpy(dst_data[1], src_data[1], 4*256);
399 } else {
400 78915 int i, planes_nb = 0;
401
402
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 317524 for (i = 0; i < desc->nb_components; i++)
403 238609 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
404
405
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 306582 for (i = 0; i < planes_nb; i++) {
406 227667 int h = height;
407 227667 ptrdiff_t bwidth = av_image_get_linesize(pix_fmt, width, i);
408
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 227667 if (bwidth < 0) {
409 ✗ av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
410 ✗ return;
411 }
412
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 227667 if (i == 1 || i == 2) {
413 148422 h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
414 }
415 227667 copy_plane(dst_data[i], dst_linesizes[i],
416 227667 src_data[i], src_linesizes[i],
417 bwidth, h);
418 }
419 }
420 }
421
422 81188 void av_image_copy(uint8_t *const dst_data[4], const int dst_linesizes[4],
423 const uint8_t * const src_data[4], const int src_linesizes[4],
424 enum AVPixelFormat pix_fmt, int width, int height)
425 {
426 ptrdiff_t dst_linesizes1[4], src_linesizes1[4];
427 int i;
428
429
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 405940 for (i = 0; i < 4; i++) {
430 324752 dst_linesizes1[i] = dst_linesizes[i];
431 324752 src_linesizes1[i] = src_linesizes[i];
432 }
433
434 81188 image_copy(dst_data, dst_linesizes1, src_data, src_linesizes1, pix_fmt,
435 width, height, image_copy_plane);
436 81188 }
437
438 ✗ void av_image_copy_uc_from(uint8_t * const dst_data[4], const ptrdiff_t dst_linesizes[4],
439 const uint8_t * const src_data[4], const ptrdiff_t src_linesizes[4],
440 enum AVPixelFormat pix_fmt, int width, int height)
441 {
442 ✗ image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt,
443 width, height, av_image_copy_plane_uc_from);
444 ✗ }
445
446 24953 int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
447 const uint8_t *src, enum AVPixelFormat pix_fmt,
448 int width, int height, int align)
449 {
450 int ret, i;
451
452 24953 ret = av_image_check_size(width, height, 0, NULL);
453
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 24953 if (ret < 0)
454 ✗ return ret;
455
456 24953 ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width);
457
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 24953 if (ret < 0)
458 ✗ return ret;
459
460
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 124765 for (i = 0; i < 4; i++)
461 99812 dst_linesize[i] = FFALIGN(dst_linesize[i], align);
462
463 24953 return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
464 }
465
466 257014 int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
467 int width, int height, int align)
468 {
469 int ret, i;
470 int linesize[4];
471 ptrdiff_t aligned_linesize[4];
472 size_t sizes[4];
473 257014 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
474
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 257014 if (!desc)
475 ✗ return AVERROR(EINVAL);
476
477 257014 ret = av_image_check_size(width, height, 0, NULL);
478
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 257014 if (ret < 0)
479 ✗ return ret;
480
481 257014 ret = av_image_fill_linesizes(linesize, pix_fmt, width);
482
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 257014 if (ret < 0)
483 ✗ return ret;
484
485
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 1285070 for (i = 0; i < 4; i++)
486 1028056 aligned_linesize[i] = FFALIGN(linesize[i], align);
487
488 257014 ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, aligned_linesize);
489
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 257014 if (ret < 0)
490 ✗ return ret;
491
492 257014 ret = 0;
493
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494
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 1028056 if (sizes[i] > INT_MAX - ret)
495 ✗ return AVERROR(EINVAL);
496 1028056 ret += sizes[i];
497 }
498 257014 return ret;
499 }
500
501 115400 int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
502 const uint8_t * const src_data[4],
503 const int src_linesize[4],
504 enum AVPixelFormat pix_fmt,
505 int width, int height, int align)
506 {
507 115400 int i, j, nb_planes = 0, linesize[4];
508 115400 int size = av_image_get_buffer_size(pix_fmt, width, height, align);
509 115400 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
510 int ret;
511
512
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 115400 if (size > dst_size || size < 0 || !desc)
513 ✗ return AVERROR(EINVAL);
514
515
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 462459 for (i = 0; i < desc->nb_components; i++)
516 347059 nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
517
518 115400 nb_planes++;
519
520 115400 ret = av_image_fill_linesizes(linesize, pix_fmt, width);
521
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 115400 av_assert0(ret >= 0); // was checked previously
522
523
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 417592 for (i = 0; i < nb_planes; i++) {
524
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 302192 int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
525 302192 const uint8_t *src = src_data[i];
526 302192 h = (height + (1 << shift) - 1) >> shift;
527
528
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 71403950 for (j = 0; j < h; j++) {
529 71101758 memcpy(dst, src, linesize[i]);
530 71101758 dst += FFALIGN(linesize[i], align);
531 71101758 src += src_linesize[i];
532 }
533 }
534
535
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 115400 if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
536 250 uint32_t *d32 = (uint32_t *)dst;
537
538
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 64250 for (i = 0; i<256; i++)
539 64000 AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
540 }
541
542 115400 return size;
543 }
544
545 // Fill dst[0..dst_size] with the bytes in clear[0..clear_size]. The clear
546 // bytes are repeated until dst_size is reached. If dst_size is unaligned (i.e.
547 // dst_size%clear_size!=0), the remaining data will be filled with the beginning
548 // of the clear data only.
549 75672 static void memset_bytes(uint8_t *dst, size_t dst_size, uint8_t *clear,
550 size_t clear_size)
551 {
552 75672 int same = 1;
553 int i;
554
555
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 75672 if (!clear_size)
556 ✗ return;
557
558 // Reduce to memset() if possible.
559
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 212208 for (i = 0; i < clear_size; i++) {
560
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 175848 if (clear[i] != clear[0]) {
561 39312 same = 0;
562 39312 break;
563 }
564 }
565
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 75672 if (same)
566 36360 clear_size = 1;
567
568
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 75672 if (clear_size == 1) {
569 36360 memset(dst, clear[0], dst_size);
570 } else {
571
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 39312 if (clear_size > dst_size)
572 ✗ clear_size = dst_size;
573 39312 memcpy(dst, clear, clear_size);
574 39312 av_memcpy_backptr(dst + clear_size, clear_size, dst_size - clear_size);
575 }
576 }
577
578 // Maximum size in bytes of a plane element (usually a pixel, or multiple pixels
579 // if it's a subsampled packed format).
580 #define MAX_BLOCK_SIZE 32
581
582 789 int av_image_fill_color(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4],
583 enum AVPixelFormat pix_fmt, const uint32_t color[4],
584 int width, int height, int flags)
585 {
586 789 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
587 789 int nb_planes = av_pix_fmt_count_planes(pix_fmt);
588 // A pixel or a group of pixels on each plane, with a value that represents the color.
589 // Consider e.g. AV_PIX_FMT_UYVY422 for non-trivial cases.
590 789 uint8_t clear_block[4][MAX_BLOCK_SIZE] = {{0}}; // clear padding with 0
591 789 int clear_block_size[4] = {0};
592 789 ptrdiff_t plane_line_bytes[4] = {0};
593 int bitstream;
594 int plane, c;
595
596
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 789 if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
597 ✗ return AVERROR(EINVAL);
598
599 789 bitstream = !!(desc->flags & AV_PIX_FMT_FLAG_BITSTREAM);
600
601
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 3168 for (c = 0; c < desc->nb_components; c++) {
602 2379 const AVComponentDescriptor comp = desc->comp[c];
603
604 // We try to operate on entire non-subsampled pixel groups (for
605 // AV_PIX_FMT_UYVY422 this would mean two consecutive pixels).
606 2379 clear_block_size[comp.plane] = FFMAX(clear_block_size[comp.plane], comp.step);
607
608
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 2379 if (clear_block_size[comp.plane] > MAX_BLOCK_SIZE)
609 ✗ return AVERROR(EINVAL);
610 }
611
612 // Create a byte array for clearing 1 pixel (sometimes several pixels).
613
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 3168 for (c = 0; c < desc->nb_components; c++) {
614 2379 const AVComponentDescriptor comp = desc->comp[c];
615 // (Multiple pixels happen e.g. with AV_PIX_FMT_UYVY422.)
616
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 2379 int w = (bitstream ? 8 : 1) * clear_block_size[comp.plane] / comp.step;
617 uint8_t *c_data[4];
618 2379 const int c_linesize[4] = {0};
619 uint32_t src_array[MAX_BLOCK_SIZE];
620 int x;
621
622
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 2379 if (comp.depth > 32)
623 ✗ return AVERROR(EINVAL);
624
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 2379 if (w < 1)
625 ✗ return AVERROR(EINVAL);
626
627
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 5079 for (x = 0; x < w; x++)
628 2700 src_array[x] = color[c];
629
630
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 11895 for (x = 0; x < 4; x++)
631 9516 c_data[x] = &clear_block[x][0];
632
633 2379 av_write_image_line2(src_array, c_data, c_linesize, desc, 0, 0, c, w, 4);
634 }
635
636
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 2469 for (plane = 0; plane < nb_planes; plane++) {
637 1680 plane_line_bytes[plane] = av_image_get_linesize(pix_fmt, width, plane);
638
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 1680 if (plane_line_bytes[plane] < 0)
639 ✗ return AVERROR(EINVAL);
640 }
641
642
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 789 if (!dst_data)
643 ✗ return 0;
644
645
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 2469 for (plane = 0; plane < nb_planes; plane++) {
646 1680 size_t bytewidth = plane_line_bytes[plane];
647 1680 uint8_t *data = dst_data[plane];
648
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 1680 int chroma_div = plane == 1 || plane == 2 ? desc->log2_chroma_h : 0;
649 1680 int plane_h = ((height + ( 1 << chroma_div) - 1)) >> chroma_div;
650
651
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 77352 for (; plane_h > 0; plane_h--) {
652 75672 memset_bytes(data, bytewidth, &clear_block[plane][0], clear_block_size[plane]);
653 75672 data += dst_linesize[plane];
654 }
655 }
656
657 789 return 0;
658 }
659
660 789 int av_image_fill_black(uint8_t * const dst_data[4], const ptrdiff_t dst_linesize[4],
661 enum AVPixelFormat pix_fmt, enum AVColorRange range,
662 int width, int height)
663 {
664 789 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
665 789 int nb_planes = av_pix_fmt_count_planes(pix_fmt);
666 int rgb, xyz, pal, limited, alpha, fltp;
667 789 uint32_t colors[4] = {0};
668
669
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 789 if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
670 ✗ return AVERROR(EINVAL);
671
672 789 rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB);
673 789 xyz = !!(desc->flags & AV_PIX_FMT_FLAG_XYZ);
674 789 pal = !!(desc->flags & AV_PIX_FMT_FLAG_PAL);
675
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 789 limited = !rgb && !xyz && !pal && range != AVCOL_RANGE_JPEG;
676
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 789 alpha = !pal && !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
677 789 fltp = !!(desc->flags & AV_PIX_FMT_FLAG_FLOAT);
678
679
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 3168 for (int c = 0; c < desc->nb_components; c++) {
680 2379 const AVComponentDescriptor comp = desc->comp[c];
681 2379 uint32_t color = 0;
682
683
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 2379 if (comp.depth > 32)
684 ✗ return AVERROR(EINVAL);
685
686
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 2379 if (pix_fmt == AV_PIX_FMT_MONOWHITE) {
687 3 color = 1;
688
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 2376 } else if (c + 1 == desc->nb_components && alpha) {
689 // (Assume even limited YUV uses full range alpha.)
690
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 198 if (fltp) {
691
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 36 if (comp.depth != 16 && comp.depth != 32)
692 ✗ return AVERROR(EINVAL);
693
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 36 color = (comp.depth == 16 ? 0x3C00 : 0x3F800000); // 1.0
694 } else {
695
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 162 color = (comp.depth == 32 ? 0 : (1 << comp.depth)) - 1;
696 }
697
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 2178 } else if (c == 0 && limited && comp.depth > 1) {
698
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 320 if (comp.depth < 8 || (fltp && comp.depth != 16 && comp.depth != 32))
699 ✗ return AVERROR(EINVAL);
700
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 320 if (fltp)
701
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 16 color = (comp.depth == 16 ? 0x2C00 : 0x3D800000); // 0.0625
702 else
703 304 color = 16 << (comp.depth - 8);
704
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 1858 } else if ((c == 1 || c == 2) && !rgb && !xyz) {
705
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 792 if (comp.depth < 8 || fltp && comp.depth != 16 && comp.depth != 32)
706 ✗ return AVERROR(EINVAL);
707
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 792 if (fltp)
708 ✗ color = (comp.depth == 16 ? 0x3800 : 0x3F000000); // 0.5
709 else
710 792 color = 128 << (comp.depth - 8);
711 }
712
713 2379 colors[c] = color;
714 }
715
716 789 return av_image_fill_color(dst_data, dst_linesize, pix_fmt, colors, width, height, 0);
717 }
718