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