1 /*
2 * QEMU VNC display driver: tight encoding
3 *
4 * From libvncserver/libvncserver/tight.c
5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
7 *
8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 * THE SOFTWARE.
27 */
28
29 #include "qemu/osdep.h"
30
31 /* This needs to be before jpeglib.h line because of conflict with
32 INT32 definitions between jmorecfg.h (included by jpeglib.h) and
33 Win32 basetsd.h (included by windows.h). */
34
35 #ifdef CONFIG_PNG
36 /* The following define is needed by pngconf.h. Otherwise it won't compile,
37 because setjmp.h was already included by osdep.h. */
38 #define PNG_SKIP_SETJMP_CHECK
39 #include <png.h>
40 #endif
41 #ifdef CONFIG_VNC_JPEG
42 #include <jpeglib.h>
43 #endif
44
45 #include "qemu/bswap.h"
46 #include "vnc.h"
47 #include "vnc-enc-tight.h"
48 #include "vnc-palette.h"
49
50 /* Compression level stuff. The following array contains various
51 encoder parameters for each of 10 compression levels (0..9).
52 Last three parameters correspond to JPEG quality levels (0..9). */
53
54 static const struct {
55 int max_rect_size, max_rect_width;
56 int mono_min_rect_size, gradient_min_rect_size;
57 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
58 int gradient_threshold, gradient_threshold24;
59 int idx_max_colors_divisor;
60 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
61 } tight_conf[] = {
62 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
63 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
64 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
65 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
66 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
67 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
68 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
69 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
70 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
71 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
72 };
73
74
75 static int tight_send_framebuffer_update(VncState *vs, VncWorker *worker,
76 int x, int y, int w, int h);
77
78 #ifdef CONFIG_VNC_JPEG
79 static const struct {
80 double jpeg_freq_min; /* Don't send JPEG if the freq is below */
81 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
82 int jpeg_idx; /* Allow indexed JPEG */
83 int jpeg_full; /* Allow full color JPEG */
84 } tight_jpeg_conf[] = {
85 { 0, 8, 1, 1 },
86 { 0, 8, 1, 1 },
87 { 0, 8, 1, 1 },
88 { 0, 8, 1, 1 },
89 { 0, 10, 1, 1 },
90 { 0.1, 10, 1, 1 },
91 { 0.2, 10, 1, 1 },
92 { 0.3, 12, 0, 0 },
93 { 0.4, 14, 0, 0 },
94 { 0.5, 16, 0, 0 },
95 };
96 #endif
97
98 #ifdef CONFIG_PNG
99 static const struct {
100 int png_zlib_level, png_filters;
101 } tight_png_conf[] = {
102 { 0, PNG_NO_FILTERS },
103 { 1, PNG_NO_FILTERS },
104 { 2, PNG_NO_FILTERS },
105 { 3, PNG_NO_FILTERS },
106 { 4, PNG_NO_FILTERS },
107 { 5, PNG_ALL_FILTERS },
108 { 6, PNG_ALL_FILTERS },
109 { 7, PNG_ALL_FILTERS },
110 { 8, PNG_ALL_FILTERS },
111 { 9, PNG_ALL_FILTERS },
112 };
113
114 static int send_png_rect(VncState *vs, VncWorker *worker,
115 int x, int y, int w, int h, VncPalette *palette);
116
tight_can_send_png_rect(VncState * vs,VncTight * tight,int w,int h)117 static bool tight_can_send_png_rect(VncState *vs, VncTight *tight, int w, int h)
118 {
119 if (tight->type != VNC_ENCODING_TIGHT_PNG) {
120 return false;
121 }
122
123 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
124 vs->client_pf.bytes_per_pixel == 1) {
125 return false;
126 }
127
128 return true;
129 }
130 #endif
131
132 /*
133 * Code to guess if given rectangle is suitable for smooth image
134 * compression (by applying "gradient" filter or JPEG coder).
135 */
136
137 static unsigned int
tight_detect_smooth_image24(VncState * vs,VncTight * tight,int w,int h)138 tight_detect_smooth_image24(VncState *vs, VncTight *tight, int w, int h)
139 {
140 int off;
141 int x, y, d, dx;
142 unsigned int c;
143 unsigned int stats[256];
144 int pixels = 0;
145 int pix, left[3];
146 unsigned int errors;
147 unsigned char *buf = tight->tight.buffer;
148
149 /*
150 * If client is big-endian, color samples begin from the second
151 * byte (offset 1) of a 32-bit pixel value.
152 */
153 off = vs->client_endian == G_BIG_ENDIAN ? 1 : 0;
154
155 memset(stats, 0, sizeof (stats));
156
157 for (y = 0, x = 0; y < h && x < w;) {
158 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
159 d++) {
160 for (c = 0; c < 3; c++) {
161 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
162 }
163 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
164 for (c = 0; c < 3; c++) {
165 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
166 stats[abs(pix - left[c])]++;
167 left[c] = pix;
168 }
169 pixels++;
170 }
171 }
172 if (w > h) {
173 x += h;
174 y = 0;
175 } else {
176 x = 0;
177 y += w;
178 }
179 }
180
181 if (pixels == 0) {
182 return 0;
183 }
184
185 /* 95% smooth or more ... */
186 if (stats[0] * 33 / pixels >= 95) {
187 return 0;
188 }
189
190 errors = 0;
191 for (c = 1; c < 8; c++) {
192 errors += stats[c] * (c * c);
193 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
194 return 0;
195 }
196 }
197 for (; c < 256; c++) {
198 errors += stats[c] * (c * c);
199 }
200 errors /= (pixels * 3 - stats[0]);
201
202 return errors;
203 }
204
205 #define DEFINE_DETECT_FUNCTION(bpp) \
206 \
207 static unsigned int \
208 tight_detect_smooth_image##bpp(VncState *vs, VncTight *tight, \
209 int w, int h) { \
210 bool endian; \
211 uint##bpp##_t pix; \
212 int max[3], shift[3]; \
213 int x, y, d, dx; \
214 unsigned int c; \
215 unsigned int stats[256]; \
216 int pixels = 0; \
217 int sample, sum, left[3]; \
218 unsigned int errors; \
219 unsigned char *buf = tight->tight.buffer; \
220 \
221 endian = 0; /* FIXME */ \
222 \
223 \
224 max[0] = vs->client_pf.rmax; \
225 max[1] = vs->client_pf.gmax; \
226 max[2] = vs->client_pf.bmax; \
227 shift[0] = vs->client_pf.rshift; \
228 shift[1] = vs->client_pf.gshift; \
229 shift[2] = vs->client_pf.bshift; \
230 \
231 memset(stats, 0, sizeof(stats)); \
232 \
233 y = 0, x = 0; \
234 while (y < h && x < w) { \
235 for (d = 0; d < h - y && \
236 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
237 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
238 if (endian) { \
239 pix = bswap##bpp(pix); \
240 } \
241 for (c = 0; c < 3; c++) { \
242 left[c] = (int)(pix >> shift[c] & max[c]); \
243 } \
244 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
245 dx++) { \
246 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
247 if (endian) { \
248 pix = bswap##bpp(pix); \
249 } \
250 sum = 0; \
251 for (c = 0; c < 3; c++) { \
252 sample = (int)(pix >> shift[c] & max[c]); \
253 sum += abs(sample - left[c]); \
254 left[c] = sample; \
255 } \
256 if (sum > 255) { \
257 sum = 255; \
258 } \
259 stats[sum]++; \
260 pixels++; \
261 } \
262 } \
263 if (w > h) { \
264 x += h; \
265 y = 0; \
266 } else { \
267 x = 0; \
268 y += w; \
269 } \
270 } \
271 if (pixels == 0) { \
272 return 0; \
273 } \
274 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
275 return 0; \
276 } \
277 \
278 errors = 0; \
279 for (c = 1; c < 8; c++) { \
280 errors += stats[c] * (c * c); \
281 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
282 return 0; \
283 } \
284 } \
285 for (; c < 256; c++) { \
286 errors += stats[c] * (c * c); \
287 } \
288 errors /= (pixels - stats[0]); \
289 \
290 return errors; \
291 }
292
293 DEFINE_DETECT_FUNCTION(16)
294 DEFINE_DETECT_FUNCTION(32)
295
296 static int
tight_detect_smooth_image(VncState * vs,VncTight * tight,int w,int h)297 tight_detect_smooth_image(VncState *vs, VncTight *tight, int w, int h)
298 {
299 unsigned int errors;
300 int compression = tight->compression;
301 int quality = tight->quality;
302
303 if (!vs->vd->lossy) {
304 return 0;
305 }
306
307 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
308 vs->client_pf.bytes_per_pixel == 1 ||
309 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
310 return 0;
311 }
312
313 if (tight->quality != (uint8_t)-1) {
314 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
315 return 0;
316 }
317 } else {
318 if (w * h < tight_conf[compression].gradient_min_rect_size) {
319 return 0;
320 }
321 }
322
323 if (vs->client_pf.bytes_per_pixel == 4) {
324 if (tight->pixel24) {
325 errors = tight_detect_smooth_image24(vs, tight, w, h);
326 if (tight->quality != (uint8_t)-1) {
327 return (errors < tight_conf[quality].jpeg_threshold24);
328 }
329 return (errors < tight_conf[compression].gradient_threshold24);
330 } else {
331 errors = tight_detect_smooth_image32(vs, tight, w, h);
332 }
333 } else {
334 errors = tight_detect_smooth_image16(vs, tight, w, h);
335 }
336 if (quality != (uint8_t)-1) {
337 return (errors < tight_conf[quality].jpeg_threshold);
338 }
339 return (errors < tight_conf[compression].gradient_threshold);
340 }
341
342 /*
343 * Code to determine how many different colors used in rectangle.
344 */
345 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
346 \
347 static int \
348 tight_fill_palette##bpp(VncState *vs, VncTight *tight, \
349 int x, int y, int max, size_t count, \
350 uint32_t *bg, uint32_t *fg, \
351 VncPalette *palette) { \
352 uint##bpp##_t *data; \
353 uint##bpp##_t c0, c1, ci; \
354 int i, n0, n1; \
355 \
356 data = (uint##bpp##_t *)tight->tight.buffer; \
357 \
358 c0 = data[0]; \
359 i = 1; \
360 while (i < count && data[i] == c0) \
361 i++; \
362 if (i >= count) { \
363 *bg = *fg = c0; \
364 return 1; \
365 } \
366 \
367 if (max < 2) { \
368 return 0; \
369 } \
370 \
371 n0 = i; \
372 c1 = data[i]; \
373 n1 = 0; \
374 for (i++; i < count; i++) { \
375 ci = data[i]; \
376 if (ci == c0) { \
377 n0++; \
378 } else if (ci == c1) { \
379 n1++; \
380 } else \
381 break; \
382 } \
383 if (i >= count) { \
384 if (n0 > n1) { \
385 *bg = (uint32_t)c0; \
386 *fg = (uint32_t)c1; \
387 } else { \
388 *bg = (uint32_t)c1; \
389 *fg = (uint32_t)c0; \
390 } \
391 return 2; \
392 } \
393 \
394 if (max == 2) { \
395 return 0; \
396 } \
397 \
398 palette_init(palette, max, bpp); \
399 palette_put(palette, c0); \
400 palette_put(palette, c1); \
401 palette_put(palette, ci); \
402 \
403 for (i++; i < count; i++) { \
404 if (data[i] == ci) { \
405 continue; \
406 } else { \
407 ci = data[i]; \
408 if (!palette_put(palette, (uint32_t)ci)) { \
409 return 0; \
410 } \
411 } \
412 } \
413 \
414 return palette_size(palette); \
415 }
416
417 DEFINE_FILL_PALETTE_FUNCTION(8)
418 DEFINE_FILL_PALETTE_FUNCTION(16)
419 DEFINE_FILL_PALETTE_FUNCTION(32)
420
tight_fill_palette(VncState * vs,VncTight * tight,int x,int y,size_t count,uint32_t * bg,uint32_t * fg,VncPalette * palette)421 static int tight_fill_palette(VncState *vs, VncTight *tight, int x, int y,
422 size_t count, uint32_t *bg, uint32_t *fg,
423 VncPalette *palette)
424 {
425 int max;
426
427 max = count / tight_conf[tight->compression].idx_max_colors_divisor;
428 if (max < 2 &&
429 count >= tight_conf[tight->compression].mono_min_rect_size) {
430 max = 2;
431 }
432 if (max >= 256) {
433 max = 256;
434 }
435
436 switch (vs->client_pf.bytes_per_pixel) {
437 case 4:
438 return tight_fill_palette32(vs, tight, x, y, max, count, bg, fg,
439 palette);
440 case 2:
441 return tight_fill_palette16(vs, tight, x, y, max, count, bg, fg,
442 palette);
443 default:
444 max = 2;
445 return tight_fill_palette8(vs, tight, x, y, max, count, bg, fg,
446 palette);
447 }
448 return 0;
449 }
450
451 /*
452 * Converting truecolor samples into palette indices.
453 */
454 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
455 \
456 static void \
457 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
458 VncPalette *palette) { \
459 uint##bpp##_t *src; \
460 uint##bpp##_t rgb; \
461 int i, rep; \
462 uint8_t idx; \
463 \
464 src = (uint##bpp##_t *) buf; \
465 \
466 for (i = 0; i < count; ) { \
467 \
468 rgb = *src++; \
469 i++; \
470 rep = 0; \
471 while (i < count && *src == rgb) { \
472 rep++, src++, i++; \
473 } \
474 idx = palette_idx(palette, rgb); \
475 /* \
476 * Should never happen, but don't break everything \
477 * if it does, use the first color instead \
478 */ \
479 if (idx == (uint8_t)-1) { \
480 idx = 0; \
481 } \
482 while (rep >= 0) { \
483 *buf++ = idx; \
484 rep--; \
485 } \
486 } \
487 }
488
489 DEFINE_IDX_ENCODE_FUNCTION(16)
490 DEFINE_IDX_ENCODE_FUNCTION(32)
491
492 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
493 \
494 static void \
495 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
496 uint##bpp##_t bg, uint##bpp##_t fg) { \
497 uint##bpp##_t *ptr; \
498 unsigned int value, mask; \
499 int aligned_width; \
500 int x, y, bg_bits; \
501 \
502 ptr = (uint##bpp##_t *) buf; \
503 aligned_width = w - w % 8; \
504 \
505 for (y = 0; y < h; y++) { \
506 for (x = 0; x < aligned_width; x += 8) { \
507 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
508 if (*ptr++ != bg) { \
509 break; \
510 } \
511 } \
512 if (bg_bits == 8) { \
513 *buf++ = 0; \
514 continue; \
515 } \
516 mask = 0x80 >> bg_bits; \
517 value = mask; \
518 for (bg_bits++; bg_bits < 8; bg_bits++) { \
519 mask >>= 1; \
520 if (*ptr++ != bg) { \
521 value |= mask; \
522 } \
523 } \
524 *buf++ = (uint8_t)value; \
525 } \
526 \
527 mask = 0x80; \
528 value = 0; \
529 if (x >= w) { \
530 continue; \
531 } \
532 \
533 for (; x < w; x++) { \
534 if (*ptr++ != bg) { \
535 value |= mask; \
536 } \
537 mask >>= 1; \
538 } \
539 *buf++ = (uint8_t)value; \
540 } \
541 }
542
543 DEFINE_MONO_ENCODE_FUNCTION(8)
544 DEFINE_MONO_ENCODE_FUNCTION(16)
545 DEFINE_MONO_ENCODE_FUNCTION(32)
546
547 /*
548 * ``Gradient'' filter for 24-bit color samples.
549 * Should be called only when redMax, greenMax and blueMax are 255.
550 * Color components assumed to be byte-aligned.
551 */
552
553 static void
tight_filter_gradient24(VncState * vs,VncTight * tight,uint8_t * buf,int w,int h)554 tight_filter_gradient24(VncState *vs, VncTight *tight, uint8_t *buf,
555 int w, int h)
556 {
557 uint32_t *buf32;
558 uint32_t pix32;
559 int shift[3];
560 int *prev;
561 int here[3], upper[3], left[3], upperleft[3];
562 int prediction;
563 int x, y, c;
564
565 buf32 = (uint32_t *)buf;
566 memset(tight->gradient.buffer, 0, w * 3 * sizeof(int));
567
568 if (1 /* FIXME */) {
569 shift[0] = vs->client_pf.rshift;
570 shift[1] = vs->client_pf.gshift;
571 shift[2] = vs->client_pf.bshift;
572 } else {
573 shift[0] = 24 - vs->client_pf.rshift;
574 shift[1] = 24 - vs->client_pf.gshift;
575 shift[2] = 24 - vs->client_pf.bshift;
576 }
577
578 for (y = 0; y < h; y++) {
579 for (c = 0; c < 3; c++) {
580 upper[c] = 0;
581 here[c] = 0;
582 }
583 prev = (int *)tight->gradient.buffer;
584 for (x = 0; x < w; x++) {
585 pix32 = *buf32++;
586 for (c = 0; c < 3; c++) {
587 upperleft[c] = upper[c];
588 left[c] = here[c];
589 upper[c] = *prev;
590 here[c] = (int)(pix32 >> shift[c] & 0xFF);
591 *prev++ = here[c];
592
593 prediction = left[c] + upper[c] - upperleft[c];
594 if (prediction < 0) {
595 prediction = 0;
596 } else if (prediction > 0xFF) {
597 prediction = 0xFF;
598 }
599 *buf++ = (char)(here[c] - prediction);
600 }
601 }
602 }
603 }
604
605
606 /*
607 * ``Gradient'' filter for other color depths.
608 */
609
610 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
611 \
612 static void \
613 tight_filter_gradient##bpp(VncState *vs, VncTight *tight, \
614 uint##bpp##_t *buf, int w, int h) { \
615 uint##bpp##_t pix, diff; \
616 bool endian; \
617 int *prev; \
618 int max[3], shift[3]; \
619 int here[3], upper[3], left[3], upperleft[3]; \
620 int prediction; \
621 int x, y, c; \
622 \
623 memset(tight->gradient.buffer, 0, w * 3 * sizeof(int)); \
624 \
625 endian = 0; /* FIXME */ \
626 \
627 max[0] = vs->client_pf.rmax; \
628 max[1] = vs->client_pf.gmax; \
629 max[2] = vs->client_pf.bmax; \
630 shift[0] = vs->client_pf.rshift; \
631 shift[1] = vs->client_pf.gshift; \
632 shift[2] = vs->client_pf.bshift; \
633 \
634 for (y = 0; y < h; y++) { \
635 for (c = 0; c < 3; c++) { \
636 upper[c] = 0; \
637 here[c] = 0; \
638 } \
639 prev = (int *)tight->gradient.buffer; \
640 for (x = 0; x < w; x++) { \
641 pix = *buf; \
642 if (endian) { \
643 pix = bswap##bpp(pix); \
644 } \
645 diff = 0; \
646 for (c = 0; c < 3; c++) { \
647 upperleft[c] = upper[c]; \
648 left[c] = here[c]; \
649 upper[c] = *prev; \
650 here[c] = (int)(pix >> shift[c] & max[c]); \
651 *prev++ = here[c]; \
652 \
653 prediction = left[c] + upper[c] - upperleft[c]; \
654 if (prediction < 0) { \
655 prediction = 0; \
656 } else if (prediction > max[c]) { \
657 prediction = max[c]; \
658 } \
659 diff |= ((here[c] - prediction) & max[c]) \
660 << shift[c]; \
661 } \
662 if (endian) { \
663 diff = bswap##bpp(diff); \
664 } \
665 *buf++ = diff; \
666 } \
667 } \
668 }
669
670 DEFINE_GRADIENT_FILTER_FUNCTION(16)
671 DEFINE_GRADIENT_FILTER_FUNCTION(32)
672
673 /*
674 * Check if a rectangle is all of the same color. If needSameColor is
675 * set to non-zero, then also check that its color equals to the
676 * *colorPtr value. The result is 1 if the test is successful, and in
677 * that case new color will be stored in *colorPtr.
678 */
679
680 static bool
check_solid_tile32(VncState * vs,int x,int y,int w,int h,uint32_t * color,bool samecolor)681 check_solid_tile32(VncState *vs, int x, int y, int w, int h,
682 uint32_t *color, bool samecolor)
683 {
684 VncDisplay *vd = vs->vd;
685 uint32_t *fbptr;
686 uint32_t c;
687 int dx, dy;
688
689 fbptr = vnc_server_fb_ptr(vd, x, y);
690
691 c = *fbptr;
692 if (samecolor && (uint32_t)c != *color) {
693 return false;
694 }
695
696 for (dy = 0; dy < h; dy++) {
697 for (dx = 0; dx < w; dx++) {
698 if (c != fbptr[dx]) {
699 return false;
700 }
701 }
702 fbptr = (uint32_t *)
703 ((uint8_t *)fbptr + vnc_server_fb_stride(vd));
704 }
705
706 *color = (uint32_t)c;
707 return true;
708 }
709
check_solid_tile(VncState * vs,int x,int y,int w,int h,uint32_t * color,bool samecolor)710 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
711 uint32_t* color, bool samecolor)
712 {
713 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4);
714 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
715 }
716
find_best_solid_area(VncState * vs,int x,int y,int w,int h,uint32_t color,int * w_ptr,int * h_ptr)717 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
718 uint32_t color, int *w_ptr, int *h_ptr)
719 {
720 int dx, dy, dw, dh;
721 int w_prev;
722 int w_best = 0, h_best = 0;
723
724 w_prev = w;
725
726 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
727
728 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
729 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
730
731 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
732 break;
733 }
734
735 for (dx = x + dw; dx < x + w_prev;) {
736 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
737
738 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
739 break;
740 }
741 dx += dw;
742 }
743
744 w_prev = dx - x;
745 if (w_prev * (dy + dh - y) > w_best * h_best) {
746 w_best = w_prev;
747 h_best = dy + dh - y;
748 }
749 }
750
751 *w_ptr = w_best;
752 *h_ptr = h_best;
753 }
754
extend_solid_area(VncState * vs,int x,int y,int w,int h,uint32_t color,int * x_ptr,int * y_ptr,int * w_ptr,int * h_ptr)755 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
756 uint32_t color, int *x_ptr, int *y_ptr,
757 int *w_ptr, int *h_ptr)
758 {
759 int cx, cy;
760
761 /* Try to extend the area upwards. */
762 for ( cy = *y_ptr - 1;
763 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
764 cy-- );
765 *h_ptr += *y_ptr - (cy + 1);
766 *y_ptr = cy + 1;
767
768 /* ... downwards. */
769 for ( cy = *y_ptr + *h_ptr;
770 cy < y + h &&
771 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
772 cy++ );
773 *h_ptr += cy - (*y_ptr + *h_ptr);
774
775 /* ... to the left. */
776 for ( cx = *x_ptr - 1;
777 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
778 cx-- );
779 *w_ptr += *x_ptr - (cx + 1);
780 *x_ptr = cx + 1;
781
782 /* ... to the right. */
783 for ( cx = *x_ptr + *w_ptr;
784 cx < x + w &&
785 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
786 cx++ );
787 *w_ptr += cx - (*x_ptr + *w_ptr);
788 }
789
tight_init_stream(VncState * vs,VncTight * tight,int stream_id,int level,int strategy)790 static int tight_init_stream(VncState *vs, VncTight *tight, int stream_id,
791 int level, int strategy)
792 {
793 z_streamp zstream = &tight->stream[stream_id];
794
795 if (zstream->opaque == NULL) {
796 int err;
797
798 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
799 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
800 zstream->zalloc = vnc_zlib_zalloc;
801 zstream->zfree = vnc_zlib_zfree;
802
803 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
804 MAX_MEM_LEVEL, strategy);
805
806 if (err != Z_OK) {
807 fprintf(stderr, "VNC: error initializing zlib\n");
808 return -1;
809 }
810
811 tight->levels[stream_id] = level;
812 zstream->opaque = vs;
813 }
814
815 if (tight->levels[stream_id] != level) {
816 if (deflateParams(zstream, level, strategy) != Z_OK) {
817 return -1;
818 }
819 tight->levels[stream_id] = level;
820 }
821 return 0;
822 }
823
tight_send_compact_size(VncState * vs,size_t len)824 static void tight_send_compact_size(VncState *vs, size_t len)
825 {
826 int lpc = 0;
827 int bytes = 0;
828 char buf[3] = {0, 0, 0};
829
830 buf[bytes++] = len & 0x7F;
831 if (len > 0x7F) {
832 buf[bytes-1] |= 0x80;
833 buf[bytes++] = (len >> 7) & 0x7F;
834 if (len > 0x3FFF) {
835 buf[bytes-1] |= 0x80;
836 buf[bytes++] = (len >> 14) & 0xFF;
837 }
838 }
839 for (lpc = 0; lpc < bytes; lpc++) {
840 vnc_write_u8(vs, buf[lpc]);
841 }
842 }
843
tight_compress_data(VncState * vs,VncTight * tight,int stream_id,size_t bytes,int level,int strategy)844 static int tight_compress_data(VncState *vs, VncTight *tight, int stream_id,
845 size_t bytes, int level, int strategy)
846 {
847 z_streamp zstream = &tight->stream[stream_id];
848 int previous_out;
849
850 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
851 vnc_write(vs, tight->tight.buffer, tight->tight.offset);
852 return bytes;
853 }
854
855 if (tight_init_stream(vs, tight, stream_id, level, strategy)) {
856 return -1;
857 }
858
859 /* reserve memory in output buffer */
860 buffer_reserve(&tight->zlib, bytes + 64);
861
862 /* set pointers */
863 zstream->next_in = tight->tight.buffer;
864 zstream->avail_in = tight->tight.offset;
865 zstream->next_out = tight->zlib.buffer + tight->zlib.offset;
866 zstream->avail_out = tight->zlib.capacity - tight->zlib.offset;
867 previous_out = zstream->avail_out;
868 zstream->data_type = Z_BINARY;
869
870 /* start encoding */
871 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
872 fprintf(stderr, "VNC: error during tight compression\n");
873 return -1;
874 }
875
876 tight->zlib.offset = tight->zlib.capacity - zstream->avail_out;
877 /* ...how much data has actually been produced by deflate() */
878 bytes = previous_out - zstream->avail_out;
879
880 tight_send_compact_size(vs, bytes);
881 vnc_write(vs, tight->zlib.buffer, bytes);
882
883 buffer_reset(&tight->zlib);
884
885 return bytes;
886 }
887
888 /*
889 * Subencoding implementations.
890 */
tight_pack24(VncState * vs,uint8_t * buf,size_t count,size_t * ret)891 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
892 {
893 uint8_t *buf8;
894 uint32_t pix;
895 int rshift, gshift, bshift;
896
897 buf8 = buf;
898
899 if (vs->client_endian == G_BYTE_ORDER) {
900 rshift = vs->client_pf.rshift;
901 gshift = vs->client_pf.gshift;
902 bshift = vs->client_pf.bshift;
903 } else {
904 rshift = 24 - vs->client_pf.rshift;
905 gshift = 24 - vs->client_pf.gshift;
906 bshift = 24 - vs->client_pf.bshift;
907 }
908
909 if (ret) {
910 *ret = count * 3;
911 }
912
913 while (count--) {
914 pix = ldl_he_p(buf8);
915 *buf++ = (char)(pix >> rshift);
916 *buf++ = (char)(pix >> gshift);
917 *buf++ = (char)(pix >> bshift);
918 buf8 += 4;
919 }
920 }
921
send_full_color_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h)922 static int send_full_color_rect(VncState *vs, VncWorker *worker,
923 int x, int y, int w, int h)
924 {
925 VncTight *tight = &worker->tight;
926 int level = tight_conf[tight->compression].raw_zlib_level;
927 int stream = 0;
928 ssize_t bytes;
929
930 #ifdef CONFIG_PNG
931 if (tight_can_send_png_rect(vs, tight, w, h)) {
932 return send_png_rect(vs, worker, x, y, w, h, NULL);
933 }
934 #endif
935
936 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
937
938 if (tight->pixel24) {
939 tight_pack24(vs, tight->tight.buffer, w * h, &tight->tight.offset);
940 bytes = 3;
941 } else {
942 bytes = vs->client_pf.bytes_per_pixel;
943 }
944
945 bytes = tight_compress_data(vs, tight, stream, w * h * bytes, level,
946 Z_DEFAULT_STRATEGY);
947
948 return (bytes >= 0);
949 }
950
send_solid_rect(VncState * vs,VncWorker * worker)951 static int send_solid_rect(VncState *vs, VncWorker *worker)
952 {
953 VncTight *tight = &worker->tight;
954 size_t bytes;
955
956 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
957
958 if (tight->pixel24) {
959 tight_pack24(vs, tight->tight.buffer, 1, &tight->tight.offset);
960 bytes = 3;
961 } else {
962 bytes = vs->client_pf.bytes_per_pixel;
963 }
964
965 vnc_write(vs, tight->tight.buffer, bytes);
966 return 1;
967 }
968
send_mono_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h,uint32_t bg,uint32_t fg)969 static int send_mono_rect(VncState *vs, VncWorker *worker, int x, int y,
970 int w, int h, uint32_t bg, uint32_t fg)
971 {
972 ssize_t bytes;
973 int stream = 1;
974 int level = tight_conf[worker->tight.compression].mono_zlib_level;
975
976 #ifdef CONFIG_PNG
977 if (tight_can_send_png_rect(vs, &worker->tight, w, h)) {
978 int ret;
979 int bpp = vs->client_pf.bytes_per_pixel * 8;
980 VncPalette *palette = palette_new(2, bpp);
981
982 palette_put(palette, bg);
983 palette_put(palette, fg);
984 ret = send_png_rect(vs, worker, x, y, w, h, palette);
985 palette_destroy(palette);
986 return ret;
987 }
988 #endif
989
990 bytes = DIV_ROUND_UP(w, 8) * h;
991
992 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
993 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
994 vnc_write_u8(vs, 1);
995
996 switch (vs->client_pf.bytes_per_pixel) {
997 case 4:
998 {
999 uint32_t buf[2] = {bg, fg};
1000 size_t ret = sizeof (buf);
1001
1002 if (worker->tight.pixel24) {
1003 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
1004 }
1005 vnc_write(vs, buf, ret);
1006
1007 tight_encode_mono_rect32(worker->tight.tight.buffer, w, h, bg, fg);
1008 break;
1009 }
1010 case 2:
1011 {
1012 uint16_t bg16 = bg;
1013 uint16_t fg16 = fg;
1014 vnc_write(vs, &bg16, 2);
1015 vnc_write(vs, &fg16, 2);
1016 tight_encode_mono_rect16(worker->tight.tight.buffer, w, h, bg, fg);
1017 break;
1018 }
1019 default:
1020 {
1021 uint8_t bg8 = bg;
1022 uint8_t fg8 = fg;
1023 vnc_write_u8(vs, bg8);
1024 vnc_write_u8(vs, fg8);
1025 tight_encode_mono_rect8(worker->tight.tight.buffer, w, h, bg, fg);
1026 break;
1027 }
1028 }
1029 worker->tight.tight.offset = bytes;
1030
1031 bytes = tight_compress_data(vs, &worker->tight, stream, bytes, level,
1032 Z_DEFAULT_STRATEGY);
1033 return (bytes >= 0);
1034 }
1035
1036 struct palette_cb_priv {
1037 VncState *vs;
1038 VncTight *tight;
1039 uint8_t *header;
1040 #ifdef CONFIG_PNG
1041 png_colorp png_palette;
1042 #endif
1043 };
1044
write_palette(int idx,uint32_t color,void * opaque)1045 static void write_palette(int idx, uint32_t color, void *opaque)
1046 {
1047 struct palette_cb_priv *priv = opaque;
1048 VncState *vs = priv->vs;
1049 uint32_t bytes = vs->client_pf.bytes_per_pixel;
1050
1051 if (bytes == 4) {
1052 ((uint32_t*)priv->header)[idx] = color;
1053 } else {
1054 ((uint16_t*)priv->header)[idx] = color;
1055 }
1056 }
1057
send_gradient_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1058 static bool send_gradient_rect(VncState *vs, VncWorker *worker,
1059 int x, int y, int w, int h)
1060 {
1061 VncTight *tight = &worker->tight;
1062 int stream = 3;
1063 int level = tight_conf[tight->compression].gradient_zlib_level;
1064 ssize_t bytes;
1065
1066 if (vs->client_pf.bytes_per_pixel == 1) {
1067 return send_full_color_rect(vs, worker, x, y, w, h);
1068 }
1069
1070 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1071 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1072
1073 buffer_reserve(&tight->gradient, w * 3 * sizeof(int));
1074
1075 if (tight->pixel24) {
1076 tight_filter_gradient24(vs, tight, tight->tight.buffer, w, h);
1077 bytes = 3;
1078 } else if (vs->client_pf.bytes_per_pixel == 4) {
1079 tight_filter_gradient32(vs, tight, (uint32_t *)tight->tight.buffer,
1080 w, h);
1081 bytes = 4;
1082 } else {
1083 tight_filter_gradient16(vs, tight, (uint16_t *)tight->tight.buffer,
1084 w, h);
1085 bytes = 2;
1086 }
1087
1088 buffer_reset(&tight->gradient);
1089
1090 bytes = w * h * bytes;
1091 tight->tight.offset = bytes;
1092
1093 bytes = tight_compress_data(vs, tight, stream, bytes,
1094 level, Z_FILTERED);
1095 return (bytes >= 0);
1096 }
1097
send_palette_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h,VncPalette * palette)1098 static int send_palette_rect(VncState *vs, VncWorker *worker, int x, int y,
1099 int w, int h, VncPalette *palette)
1100 {
1101 VncTight *tight = &worker->tight;
1102 int stream = 2;
1103 int level = tight_conf[tight->compression].idx_zlib_level;
1104 int colors;
1105 ssize_t bytes;
1106
1107 #ifdef CONFIG_PNG
1108 if (tight_can_send_png_rect(vs, tight, w, h)) {
1109 return send_png_rect(vs, worker, x, y, w, h, palette);
1110 }
1111 #endif
1112
1113 colors = palette_size(palette);
1114
1115 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1116 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1117 vnc_write_u8(vs, colors - 1);
1118
1119 switch (vs->client_pf.bytes_per_pixel) {
1120 case 4:
1121 {
1122 size_t old_offset, offset, palette_sz = palette_size(palette);
1123 g_autofree uint32_t *header = g_new(uint32_t, palette_sz);
1124 struct palette_cb_priv priv = { vs, tight, (uint8_t *)header };
1125
1126 old_offset = vs->output.offset;
1127 palette_iter(palette, write_palette, &priv);
1128 vnc_write(vs, header, palette_sz * sizeof(uint32_t));
1129
1130 if (tight->pixel24) {
1131 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1132 vs->output.offset = old_offset + offset;
1133 }
1134
1135 tight_encode_indexed_rect32(tight->tight.buffer, w * h, palette);
1136 break;
1137 }
1138 case 2:
1139 {
1140 size_t palette_sz = palette_size(palette);
1141 g_autofree uint16_t *header = g_new(uint16_t, palette_sz);
1142 struct palette_cb_priv priv = { vs, tight, (uint8_t *)header };
1143
1144 palette_iter(palette, write_palette, &priv);
1145 vnc_write(vs, header, palette_sz * sizeof(uint16_t));
1146 tight_encode_indexed_rect16(tight->tight.buffer, w * h, palette);
1147 break;
1148 }
1149 default:
1150 return -1; /* No palette for 8bits colors */
1151 }
1152 bytes = w * h;
1153 tight->tight.offset = bytes;
1154
1155 bytes = tight_compress_data(vs, tight, stream, bytes,
1156 level, Z_DEFAULT_STRATEGY);
1157 return (bytes >= 0);
1158 }
1159
1160 /*
1161 * JPEG compression stuff.
1162 */
1163 #ifdef CONFIG_VNC_JPEG
1164 /*
1165 * Destination manager implementation for JPEG library.
1166 */
1167
1168 /* This is called once per encoding */
jpeg_init_destination(j_compress_ptr cinfo)1169 static void jpeg_init_destination(j_compress_ptr cinfo)
1170 {
1171 VncTight *tight = cinfo->client_data;
1172 Buffer *buffer = &tight->jpeg;
1173
1174 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1175 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1176 }
1177
1178 /* This is called when we ran out of buffer (shouldn't happen!) */
jpeg_empty_output_buffer(j_compress_ptr cinfo)1179 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1180 {
1181 VncTight *tight = cinfo->client_data;
1182 Buffer *buffer = &tight->jpeg;
1183
1184 buffer->offset = buffer->capacity;
1185 buffer_reserve(buffer, 2048);
1186 jpeg_init_destination(cinfo);
1187 return TRUE;
1188 }
1189
1190 /* This is called when we are done processing data */
jpeg_term_destination(j_compress_ptr cinfo)1191 static void jpeg_term_destination(j_compress_ptr cinfo)
1192 {
1193 VncTight *tight = cinfo->client_data;
1194 Buffer *buffer = &tight->jpeg;
1195
1196 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1197 }
1198
send_jpeg_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h,int quality)1199 static int send_jpeg_rect(VncState *vs, VncWorker *worker,
1200 int x, int y, int w, int h, int quality)
1201 {
1202 struct jpeg_compress_struct cinfo;
1203 struct jpeg_error_mgr jerr;
1204 struct jpeg_destination_mgr manager;
1205 pixman_image_t *linebuf;
1206 JSAMPROW row[1];
1207 uint8_t *buf;
1208 int dy;
1209
1210 if (surface_bytes_per_pixel(vs->vd->ds) == 1) {
1211 return send_full_color_rect(vs, worker, x, y, w, h);
1212 }
1213
1214 buffer_reserve(&worker->tight.jpeg, 2048);
1215
1216 cinfo.err = jpeg_std_error(&jerr);
1217 jpeg_create_compress(&cinfo);
1218
1219 cinfo.client_data = &worker->tight;
1220 cinfo.image_width = w;
1221 cinfo.image_height = h;
1222 cinfo.input_components = 3;
1223 cinfo.in_color_space = JCS_RGB;
1224
1225 jpeg_set_defaults(&cinfo);
1226 jpeg_set_quality(&cinfo, quality, true);
1227
1228 manager.init_destination = jpeg_init_destination;
1229 manager.empty_output_buffer = jpeg_empty_output_buffer;
1230 manager.term_destination = jpeg_term_destination;
1231 cinfo.dest = &manager;
1232
1233 jpeg_start_compress(&cinfo, true);
1234
1235 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1236 buf = (uint8_t *)pixman_image_get_data(linebuf);
1237 row[0] = buf;
1238 for (dy = 0; dy < h; dy++) {
1239 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1240 jpeg_write_scanlines(&cinfo, row, 1);
1241 }
1242 qemu_pixman_image_unref(linebuf);
1243
1244 jpeg_finish_compress(&cinfo);
1245 jpeg_destroy_compress(&cinfo);
1246
1247 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1248
1249 tight_send_compact_size(vs, worker->tight.jpeg.offset);
1250 vnc_write(vs, worker->tight.jpeg.buffer, worker->tight.jpeg.offset);
1251 buffer_reset(&worker->tight.jpeg);
1252
1253 return 1;
1254 }
1255 #endif /* CONFIG_VNC_JPEG */
1256
1257 /*
1258 * PNG compression stuff.
1259 */
1260 #ifdef CONFIG_PNG
write_png_palette(int idx,uint32_t pix,void * opaque)1261 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1262 {
1263 struct palette_cb_priv *priv = opaque;
1264 VncState *vs = priv->vs;
1265 png_colorp color = &priv->png_palette[idx];
1266
1267 if (priv->tight->pixel24)
1268 {
1269 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1270 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1271 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1272 }
1273 else
1274 {
1275 int red, green, blue;
1276
1277 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1278 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1279 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1280 color->red = ((red * 255 + vs->client_pf.rmax / 2) /
1281 vs->client_pf.rmax);
1282 color->green = ((green * 255 + vs->client_pf.gmax / 2) /
1283 vs->client_pf.gmax);
1284 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) /
1285 vs->client_pf.bmax);
1286 }
1287 }
1288
png_write_data(png_structp png_ptr,png_bytep data,png_size_t length)1289 static void png_write_data(png_structp png_ptr, png_bytep data,
1290 png_size_t length)
1291 {
1292 VncWorker *worker = png_get_io_ptr(png_ptr);
1293
1294 buffer_reserve(&worker->tight.png, worker->tight.png.offset + length);
1295 memcpy(worker->tight.png.buffer + worker->tight.png.offset, data, length);
1296
1297 worker->tight.png.offset += length;
1298 }
1299
png_flush_data(png_structp png_ptr)1300 static void png_flush_data(png_structp png_ptr)
1301 {
1302 }
1303
vnc_png_malloc(png_structp png_ptr,png_size_t size)1304 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1305 {
1306 return g_malloc(size);
1307 }
1308
vnc_png_free(png_structp png_ptr,png_voidp ptr)1309 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1310 {
1311 g_free(ptr);
1312 }
1313
send_png_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h,VncPalette * palette)1314 static int send_png_rect(VncState *vs, VncWorker *worker,
1315 int x, int y, int w, int h, VncPalette *palette)
1316 {
1317 png_byte color_type;
1318 png_structp png_ptr;
1319 png_infop info_ptr;
1320 png_colorp png_palette = NULL;
1321 pixman_image_t *linebuf;
1322 int level = tight_png_conf[worker->tight.compression].png_zlib_level;
1323 int filters = tight_png_conf[worker->tight.compression].png_filters;
1324 uint8_t *buf;
1325 int dy;
1326
1327 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1328 NULL, vnc_png_malloc, vnc_png_free);
1329
1330 if (png_ptr == NULL)
1331 return -1;
1332
1333 info_ptr = png_create_info_struct(png_ptr);
1334
1335 if (info_ptr == NULL) {
1336 png_destroy_write_struct(&png_ptr, NULL);
1337 return -1;
1338 }
1339
1340 png_set_write_fn(png_ptr, worker, png_write_data, png_flush_data);
1341 png_set_compression_level(png_ptr, level);
1342 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1343
1344 if (palette) {
1345 color_type = PNG_COLOR_TYPE_PALETTE;
1346 } else {
1347 color_type = PNG_COLOR_TYPE_RGB;
1348 }
1349
1350 png_set_IHDR(png_ptr, info_ptr, w, h,
1351 8, color_type, PNG_INTERLACE_NONE,
1352 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1353
1354 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1355 struct palette_cb_priv priv;
1356
1357 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1358 palette_size(palette));
1359
1360 priv.vs = vs;
1361 priv.tight = &worker->tight;
1362 priv.png_palette = png_palette;
1363 palette_iter(palette, write_png_palette, &priv);
1364
1365 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1366
1367 if (vs->client_pf.bytes_per_pixel == 4) {
1368 tight_encode_indexed_rect32(worker->tight.tight.buffer, w * h,
1369 palette);
1370 } else {
1371 tight_encode_indexed_rect16(worker->tight.tight.buffer, w * h,
1372 palette);
1373 }
1374 }
1375
1376 png_write_info(png_ptr, info_ptr);
1377
1378 buffer_reserve(&worker->tight.png, 2048);
1379 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1380 buf = (uint8_t *)pixman_image_get_data(linebuf);
1381 for (dy = 0; dy < h; dy++)
1382 {
1383 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1384 memcpy(buf, worker->tight.tight.buffer + (dy * w), w);
1385 } else {
1386 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1387 }
1388 png_write_row(png_ptr, buf);
1389 }
1390 qemu_pixman_image_unref(linebuf);
1391
1392 png_write_end(png_ptr, NULL);
1393
1394 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1395 png_free(png_ptr, png_palette);
1396 }
1397
1398 png_destroy_write_struct(&png_ptr, &info_ptr);
1399
1400 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1401
1402 tight_send_compact_size(vs, worker->tight.png.offset);
1403 vnc_write(vs, worker->tight.png.buffer, worker->tight.png.offset);
1404 buffer_reset(&worker->tight.png);
1405 return 1;
1406 }
1407 #endif /* CONFIG_PNG */
1408
vnc_tight_start(VncState * vs,VncTight * tight)1409 static void vnc_tight_start(VncState *vs, VncTight *tight)
1410 {
1411 buffer_reset(&tight->tight);
1412
1413 // make the output buffer be the zlib buffer, so we can compress it later
1414 tight->tmp = vs->output;
1415 vs->output = tight->tight;
1416 }
1417
vnc_tight_stop(VncState * vs,VncTight * tight)1418 static void vnc_tight_stop(VncState *vs, VncTight *tight)
1419 {
1420 // switch back to normal output/zlib buffers
1421 tight->tight = vs->output;
1422 vs->output = tight->tmp;
1423 }
1424
send_sub_rect_nojpeg(VncState * vs,VncWorker * worker,int x,int y,int w,int h,int bg,int fg,int colors,VncPalette * palette)1425 static int send_sub_rect_nojpeg(VncState *vs, VncWorker *worker,
1426 int x, int y, int w, int h,
1427 int bg, int fg, int colors, VncPalette *palette)
1428 {
1429 int ret;
1430
1431 if (colors == 0) {
1432 if (tight_detect_smooth_image(vs, &worker->tight, w, h)) {
1433 ret = send_gradient_rect(vs, worker, x, y, w, h);
1434 } else {
1435 ret = send_full_color_rect(vs, worker, x, y, w, h);
1436 }
1437 } else if (colors == 1) {
1438 ret = send_solid_rect(vs, worker);
1439 } else if (colors == 2) {
1440 ret = send_mono_rect(vs, worker, x, y, w, h, bg, fg);
1441 } else if (colors <= 256) {
1442 ret = send_palette_rect(vs, worker, x, y, w, h, palette);
1443 } else {
1444 ret = 0;
1445 }
1446 return ret;
1447 }
1448
1449 #ifdef CONFIG_VNC_JPEG
send_sub_rect_jpeg(VncState * vs,VncWorker * worker,int x,int y,int w,int h,int bg,int fg,int colors,VncPalette * palette,bool force)1450 static int send_sub_rect_jpeg(VncState *vs, VncWorker *worker,
1451 int x, int y, int w, int h,
1452 int bg, int fg, int colors,
1453 VncPalette *palette, bool force)
1454 {
1455 int ret;
1456
1457 if (colors == 0) {
1458 if (force || (tight_jpeg_conf[worker->tight.quality].jpeg_full &&
1459 tight_detect_smooth_image(vs, &worker->tight, w, h))) {
1460 int quality = tight_conf[worker->tight.quality].jpeg_quality;
1461
1462 ret = send_jpeg_rect(vs, worker, x, y, w, h, quality);
1463 } else {
1464 ret = send_full_color_rect(vs, worker, x, y, w, h);
1465 }
1466 } else if (colors == 1) {
1467 ret = send_solid_rect(vs, worker);
1468 } else if (colors == 2) {
1469 ret = send_mono_rect(vs, worker, x, y, w, h, bg, fg);
1470 } else if (colors <= 256) {
1471 if (force || (colors > 96 &&
1472 tight_jpeg_conf[worker->tight.quality].jpeg_idx &&
1473 tight_detect_smooth_image(vs, &worker->tight, w, h))) {
1474 int quality = tight_conf[worker->tight.quality].jpeg_quality;
1475
1476 ret = send_jpeg_rect(vs, worker, x, y, w, h, quality);
1477 } else {
1478 ret = send_palette_rect(vs, worker, x, y, w, h, palette);
1479 }
1480 } else {
1481 ret = 0;
1482 }
1483 return ret;
1484 }
1485 #endif
1486
1487 static __thread VncPalette *color_count_palette;
1488 static __thread Notifier vnc_tight_cleanup_notifier;
1489
vnc_tight_cleanup(Notifier * n,void * value)1490 static void vnc_tight_cleanup(Notifier *n, void *value)
1491 {
1492 g_free(color_count_palette);
1493 color_count_palette = NULL;
1494 }
1495
send_sub_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1496 static int send_sub_rect(VncState *vs, VncWorker *worker,
1497 int x, int y, int w, int h)
1498 {
1499 VncTight *tight = &worker->tight;
1500 uint32_t bg = 0, fg = 0;
1501 int colors;
1502 int ret = 0;
1503 #ifdef CONFIG_VNC_JPEG
1504 bool force_jpeg = false;
1505 bool allow_jpeg = true;
1506 #endif
1507
1508 if (!color_count_palette) {
1509 color_count_palette = g_new(VncPalette, 1);
1510 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup;
1511 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier);
1512 }
1513
1514 vnc_framebuffer_update(vs, x, y, w, h, tight->type);
1515
1516 vnc_tight_start(vs, tight);
1517 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1518 vnc_tight_stop(vs, tight);
1519
1520 #ifdef CONFIG_VNC_JPEG
1521 if (!vs->vd->non_adaptive && tight->quality != (uint8_t)-1) {
1522 double freq = vnc_update_freq(vs, x, y, w, h);
1523
1524 if (freq < tight_jpeg_conf[tight->quality].jpeg_freq_min) {
1525 allow_jpeg = false;
1526 }
1527 if (freq >= tight_jpeg_conf[tight->quality].jpeg_freq_threshold) {
1528 force_jpeg = true;
1529 vnc_sent_lossy_rect(worker, x, y, w, h);
1530 }
1531 }
1532 #endif
1533
1534 colors = tight_fill_palette(vs, tight, x, y, w * h, &bg, &fg,
1535 color_count_palette);
1536
1537 #ifdef CONFIG_VNC_JPEG
1538 if (allow_jpeg && tight->quality != (uint8_t)-1) {
1539 ret = send_sub_rect_jpeg(vs, worker, x, y, w, h, bg, fg, colors,
1540 color_count_palette, force_jpeg);
1541 } else {
1542 ret = send_sub_rect_nojpeg(vs, worker, x, y, w, h, bg, fg,
1543 colors, color_count_palette);
1544 }
1545 #else
1546 ret = send_sub_rect_nojpeg(vs, worker, x, y, w, h, bg, fg, colors,
1547 color_count_palette);
1548 #endif
1549
1550 return ret;
1551 }
1552
send_sub_rect_solid(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1553 static int send_sub_rect_solid(VncState *vs, VncWorker *worker,
1554 int x, int y, int w, int h)
1555 {
1556 vnc_framebuffer_update(vs, x, y, w, h, worker->tight.type);
1557
1558 vnc_tight_start(vs, &worker->tight);
1559 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1560 vnc_tight_stop(vs, &worker->tight);
1561
1562 return send_solid_rect(vs, worker);
1563 }
1564
send_rect_simple(VncState * vs,VncWorker * worker,int x,int y,int w,int h,bool split)1565 static int send_rect_simple(VncState *vs, VncWorker *worker,
1566 int x, int y, int w, int h, bool split)
1567 {
1568 int max_size, max_width;
1569 int max_sub_width, max_sub_height;
1570 int dx, dy;
1571 int rw, rh;
1572 int n = 0;
1573
1574 max_size = tight_conf[worker->tight.compression].max_rect_size;
1575 max_width = tight_conf[worker->tight.compression].max_rect_width;
1576
1577 if (split && (w > max_width || w * h > max_size)) {
1578 max_sub_width = (w > max_width) ? max_width : w;
1579 max_sub_height = max_size / max_sub_width;
1580
1581 for (dy = 0; dy < h; dy += max_sub_height) {
1582 for (dx = 0; dx < w; dx += max_width) {
1583 rw = MIN(max_sub_width, w - dx);
1584 rh = MIN(max_sub_height, h - dy);
1585 n += send_sub_rect(vs, worker, x + dx, y + dy, rw, rh);
1586 }
1587 }
1588 } else {
1589 n += send_sub_rect(vs, worker, x, y, w, h);
1590 }
1591
1592 return n;
1593 }
1594
find_large_solid_color_rect(VncState * vs,VncWorker * worker,int x,int y,int w,int h,int max_rows)1595 static int find_large_solid_color_rect(VncState *vs, VncWorker *worker,
1596 int x, int y, int w, int h, int max_rows)
1597 {
1598 int dx, dy, dw, dh;
1599 int n = 0;
1600
1601 /* Try to find large solid-color areas and send them separately. */
1602
1603 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1604
1605 /* If a rectangle becomes too large, send its upper part now. */
1606
1607 if (dy - y >= max_rows) {
1608 n += send_rect_simple(vs, worker, x, y, w, max_rows, true);
1609 y += max_rows;
1610 h -= max_rows;
1611 }
1612
1613 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1614
1615 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1616 uint32_t color_value;
1617 int x_best, y_best, w_best, h_best;
1618
1619 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1620
1621 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1622 continue ;
1623 }
1624
1625 /* Get dimensions of solid-color area. */
1626
1627 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1628 color_value, &w_best, &h_best);
1629
1630 /* Make sure a solid rectangle is large enough
1631 (or the whole rectangle is of the same color). */
1632
1633 if (w_best * h_best != w * h &&
1634 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1635 continue;
1636 }
1637
1638 /* Try to extend solid rectangle to maximum size. */
1639
1640 x_best = dx; y_best = dy;
1641 extend_solid_area(vs, x, y, w, h, color_value,
1642 &x_best, &y_best, &w_best, &h_best);
1643
1644 /* Send rectangles at top and left to solid-color area. */
1645
1646 if (y_best != y) {
1647 n += send_rect_simple(vs, worker, x, y, w, y_best - y, true);
1648 }
1649 if (x_best != x) {
1650 n += tight_send_framebuffer_update(vs, worker, x, y_best,
1651 x_best-x, h_best);
1652 }
1653
1654 /* Send solid-color rectangle. */
1655 n += send_sub_rect_solid(vs, worker,
1656 x_best, y_best, w_best, h_best);
1657
1658 /* Send remaining rectangles (at right and bottom). */
1659
1660 if (x_best + w_best != x + w) {
1661 n += tight_send_framebuffer_update(vs, worker, x_best + w_best,
1662 y_best,
1663 w-(x_best-x)-w_best,
1664 h_best);
1665 }
1666 if (y_best + h_best != y + h) {
1667 n += tight_send_framebuffer_update(vs, worker,
1668 x, y_best + h_best,
1669 w, h-(y_best-y)-h_best);
1670 }
1671
1672 /* Return after all recursive calls are done. */
1673 return n;
1674 }
1675 }
1676 return n + send_rect_simple(vs, worker, x, y, w, h, true);
1677 }
1678
tight_send_framebuffer_update(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1679 static int tight_send_framebuffer_update(VncState *vs, VncWorker *worker,
1680 int x, int y, int w, int h)
1681 {
1682 int max_rows;
1683
1684 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF &&
1685 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) {
1686 worker->tight.pixel24 = true;
1687 } else {
1688 worker->tight.pixel24 = false;
1689 }
1690
1691 #ifdef CONFIG_VNC_JPEG
1692 if (worker->tight.quality != (uint8_t)-1) {
1693 double freq = vnc_update_freq(vs, x, y, w, h);
1694
1695 if (freq > tight_jpeg_conf[worker->tight.quality].jpeg_freq_threshold) {
1696 return send_rect_simple(vs, worker, x, y, w, h, false);
1697 }
1698 }
1699 #endif
1700
1701 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1702 return send_rect_simple(vs, worker, x, y, w, h, true);
1703 }
1704
1705 /* Calculate maximum number of rows in one non-solid rectangle. */
1706
1707 max_rows = tight_conf[worker->tight.compression].max_rect_size;
1708 max_rows /= MIN(tight_conf[worker->tight.compression].max_rect_width, w);
1709
1710 return find_large_solid_color_rect(vs, worker, x, y, w, h, max_rows);
1711 }
1712
vnc_tight_send_framebuffer_update(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1713 int vnc_tight_send_framebuffer_update(VncState *vs, VncWorker *worker,
1714 int x, int y, int w, int h)
1715 {
1716 worker->tight.type = VNC_ENCODING_TIGHT;
1717 return tight_send_framebuffer_update(vs, worker, x, y, w, h);
1718 }
1719
vnc_tight_png_send_framebuffer_update(VncState * vs,VncWorker * worker,int x,int y,int w,int h)1720 int vnc_tight_png_send_framebuffer_update(VncState *vs, VncWorker *worker,
1721 int x, int y, int w, int h)
1722 {
1723 worker->tight.type = VNC_ENCODING_TIGHT_PNG;
1724 return tight_send_framebuffer_update(vs, worker, x, y, w, h);
1725 }
1726
vnc_tight_clear(VncWorker * worker)1727 void vnc_tight_clear(VncWorker *worker)
1728 {
1729 int i;
1730 for (i = 0; i < ARRAY_SIZE(worker->tight.stream); i++) {
1731 if (worker->tight.stream[i].opaque) {
1732 deflateEnd(&worker->tight.stream[i]);
1733 }
1734 }
1735
1736 buffer_free(&worker->tight.tight);
1737 buffer_free(&worker->tight.zlib);
1738 buffer_free(&worker->tight.gradient);
1739 #ifdef CONFIG_VNC_JPEG
1740 buffer_free(&worker->tight.jpeg);
1741 #endif
1742 #ifdef CONFIG_PNG
1743 buffer_free(&worker->tight.png);
1744 #endif
1745 }
1746