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Merge remote-tracking branch 'kwolf/for-anthony' into staging
[qemu.git] / ui / vnc-enc-tight.c
blob5d492abe9207af4ec90737475126136f75355176
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 "config-host.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 #include "qemu-common.h"
35
36 #ifdef CONFIG_VNC_PNG
37 /* The following define is needed by pngconf.h. Otherwise it won't compile,
38 because setjmp.h was already included by qemu-common.h. */
39 #define PNG_SKIP_SETJMP_CHECK
40 #include <png.h>
41 #endif
42 #ifdef CONFIG_VNC_JPEG
43 #include <stdio.h>
44 #include <jpeglib.h>
45 #endif
46
47 #include "bswap.h"
48 #include "qint.h"
49 #include "vnc.h"
50 #include "vnc-enc-tight.h"
51 #include "vnc-palette.h"
52
53 /* Compression level stuff. The following array contains various
54 encoder parameters for each of 10 compression levels (0..9).
55 Last three parameters correspond to JPEG quality levels (0..9). */
56
57 static const struct {
58 int max_rect_size, max_rect_width;
59 int mono_min_rect_size, gradient_min_rect_size;
60 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
61 int gradient_threshold, gradient_threshold24;
62 int idx_max_colors_divisor;
63 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
64 } tight_conf[] = {
65 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
66 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
67 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
68 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
69 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
70 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
71 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
72 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
73 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
74 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
75 };
76
77
78 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
79 int w, int h);
80
81 #ifdef CONFIG_VNC_JPEG
82 static const struct {
83 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */
84 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
85 int jpeg_idx; /* Allow indexed JPEG */
86 int jpeg_full; /* Allow full color JPEG */
87 } tight_jpeg_conf[] = {
88 { 0, 8, 1, 1 },
89 { 0, 8, 1, 1 },
90 { 0, 8, 1, 1 },
91 { 0, 8, 1, 1 },
92 { 0, 10, 1, 1 },
93 { 0.1, 10, 1, 1 },
94 { 0.2, 10, 1, 1 },
95 { 0.3, 12, 0, 0 },
96 { 0.4, 14, 0, 0 },
97 { 0.5, 16, 0, 0 },
98 };
99 #endif
100
101 #ifdef CONFIG_VNC_PNG
102 static const struct {
103 int png_zlib_level, png_filters;
104 } tight_png_conf[] = {
105 { 0, PNG_NO_FILTERS },
106 { 1, PNG_NO_FILTERS },
107 { 2, PNG_NO_FILTERS },
108 { 3, PNG_NO_FILTERS },
109 { 4, PNG_NO_FILTERS },
110 { 5, PNG_ALL_FILTERS },
111 { 6, PNG_ALL_FILTERS },
112 { 7, PNG_ALL_FILTERS },
113 { 8, PNG_ALL_FILTERS },
114 { 9, PNG_ALL_FILTERS },
115 };
116
117 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
118 VncPalette *palette);
119
120 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
121 {
122 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
123 return false;
124 }
125
126 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
127 vs->clientds.pf.bytes_per_pixel == 1) {
128 return false;
129 }
130
131 return true;
132 }
133 #endif
134
135 /*
136 * Code to guess if given rectangle is suitable for smooth image
137 * compression (by applying "gradient" filter or JPEG coder).
138 */
139
140 static unsigned int
141 tight_detect_smooth_image24(VncState *vs, int w, int h)
142 {
143 int off;
144 int x, y, d, dx;
145 unsigned int c;
146 unsigned int stats[256];
147 int pixels = 0;
148 int pix, left[3];
149 unsigned int errors;
150 unsigned char *buf = vs->tight.tight.buffer;
151
152 /*
153 * If client is big-endian, color samples begin from the second
154 * byte (offset 1) of a 32-bit pixel value.
155 */
156 off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG);
157
158 memset(stats, 0, sizeof (stats));
159
160 for (y = 0, x = 0; y < h && x < w;) {
161 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
162 d++) {
163 for (c = 0; c < 3; c++) {
164 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
165 }
166 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
167 for (c = 0; c < 3; c++) {
168 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
169 stats[abs(pix - left[c])]++;
170 left[c] = pix;
171 }
172 pixels++;
173 }
174 }
175 if (w > h) {
176 x += h;
177 y = 0;
178 } else {
179 x = 0;
180 y += w;
181 }
182 }
183
184 /* 95% smooth or more ... */
185 if (stats[0] * 33 / pixels >= 95) {
186 return 0;
187 }
188
189 errors = 0;
190 for (c = 1; c < 8; c++) {
191 errors += stats[c] * (c * c);
192 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
193 return 0;
194 }
195 }
196 for (; c < 256; c++) {
197 errors += stats[c] * (c * c);
198 }
199 errors /= (pixels * 3 - stats[0]);
200
201 return errors;
202 }
203
204 #define DEFINE_DETECT_FUNCTION(bpp) \
205 \
206 static unsigned int \
207 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
208 bool endian; \
209 uint##bpp##_t pix; \
210 int max[3], shift[3]; \
211 int x, y, d, dx; \
212 unsigned int c; \
213 unsigned int stats[256]; \
214 int pixels = 0; \
215 int sample, sum, left[3]; \
216 unsigned int errors; \
217 unsigned char *buf = vs->tight.tight.buffer; \
218 \
219 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
220 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
221 \
222 \
223 max[0] = vs->clientds.pf.rmax; \
224 max[1] = vs->clientds.pf.gmax; \
225 max[2] = vs->clientds.pf.bmax; \
226 shift[0] = vs->clientds.pf.rshift; \
227 shift[1] = vs->clientds.pf.gshift; \
228 shift[2] = vs->clientds.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 \
271 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
272 return 0; \
273 } \
274 \
275 errors = 0; \
276 for (c = 1; c < 8; c++) { \
277 errors += stats[c] * (c * c); \
278 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
279 return 0; \
280 } \
281 } \
282 for (; c < 256; c++) { \
283 errors += stats[c] * (c * c); \
284 } \
285 errors /= (pixels - stats[0]); \
286 \
287 return errors; \
288 }
289
290 DEFINE_DETECT_FUNCTION(16)
291 DEFINE_DETECT_FUNCTION(32)
292
293 static int
294 tight_detect_smooth_image(VncState *vs, int w, int h)
295 {
296 unsigned int errors;
297 int compression = vs->tight.compression;
298 int quality = vs->tight.quality;
299
300 if (!vs->vd->lossy) {
301 return 0;
302 }
303
304 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
305 vs->clientds.pf.bytes_per_pixel == 1 ||
306 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
307 return 0;
308 }
309
310 if (vs->tight.quality != (uint8_t)-1) {
311 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
312 return 0;
313 }
314 } else {
315 if (w * h < tight_conf[compression].gradient_min_rect_size) {
316 return 0;
317 }
318 }
319
320 if (vs->clientds.pf.bytes_per_pixel == 4) {
321 if (vs->tight.pixel24) {
322 errors = tight_detect_smooth_image24(vs, w, h);
323 if (vs->tight.quality != (uint8_t)-1) {
324 return (errors < tight_conf[quality].jpeg_threshold24);
325 }
326 return (errors < tight_conf[compression].gradient_threshold24);
327 } else {
328 errors = tight_detect_smooth_image32(vs, w, h);
329 }
330 } else {
331 errors = tight_detect_smooth_image16(vs, w, h);
332 }
333 if (quality != -1) {
334 return (errors < tight_conf[quality].jpeg_threshold);
335 }
336 return (errors < tight_conf[compression].gradient_threshold);
337 }
338
339 /*
340 * Code to determine how many different colors used in rectangle.
341 */
342 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
343 \
344 static int \
345 tight_fill_palette##bpp(VncState *vs, int x, int y, \
346 int max, size_t count, \
347 uint32_t *bg, uint32_t *fg, \
348 VncPalette **palette) { \
349 uint##bpp##_t *data; \
350 uint##bpp##_t c0, c1, ci; \
351 int i, n0, n1; \
352 \
353 data = (uint##bpp##_t *)vs->tight.tight.buffer; \
354 \
355 c0 = data[0]; \
356 i = 1; \
357 while (i < count && data[i] == c0) \
358 i++; \
359 if (i >= count) { \
360 *bg = *fg = c0; \
361 return 1; \
362 } \
363 \
364 if (max < 2) { \
365 return 0; \
366 } \
367 \
368 n0 = i; \
369 c1 = data[i]; \
370 n1 = 0; \
371 for (i++; i < count; i++) { \
372 ci = data[i]; \
373 if (ci == c0) { \
374 n0++; \
375 } else if (ci == c1) { \
376 n1++; \
377 } else \
378 break; \
379 } \
380 if (i >= count) { \
381 if (n0 > n1) { \
382 *bg = (uint32_t)c0; \
383 *fg = (uint32_t)c1; \
384 } else { \
385 *bg = (uint32_t)c1; \
386 *fg = (uint32_t)c0; \
387 } \
388 return 2; \
389 } \
390 \
391 if (max == 2) { \
392 return 0; \
393 } \
394 \
395 *palette = palette_new(max, bpp); \
396 palette_put(*palette, c0); \
397 palette_put(*palette, c1); \
398 palette_put(*palette, ci); \
399 \
400 for (i++; i < count; i++) { \
401 if (data[i] == ci) { \
402 continue; \
403 } else { \
404 ci = data[i]; \
405 if (!palette_put(*palette, (uint32_t)ci)) { \
406 return 0; \
407 } \
408 } \
409 } \
410 \
411 return palette_size(*palette); \
412 }
413
414 DEFINE_FILL_PALETTE_FUNCTION(8)
415 DEFINE_FILL_PALETTE_FUNCTION(16)
416 DEFINE_FILL_PALETTE_FUNCTION(32)
417
418 static int tight_fill_palette(VncState *vs, int x, int y,
419 size_t count, uint32_t *bg, uint32_t *fg,
420 VncPalette **palette)
421 {
422 int max;
423
424 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
425 if (max < 2 &&
426 count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
427 max = 2;
428 }
429 if (max >= 256) {
430 max = 256;
431 }
432
433 switch(vs->clientds.pf.bytes_per_pixel) {
434 case 4:
435 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
436 case 2:
437 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
438 default:
439 max = 2;
440 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
441 }
442 return 0;
443 }
444
445 /*
446 * Converting truecolor samples into palette indices.
447 */
448 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
449 \
450 static void \
451 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
452 VncPalette *palette) { \
453 uint##bpp##_t *src; \
454 uint##bpp##_t rgb; \
455 int i, rep; \
456 uint8_t idx; \
457 \
458 src = (uint##bpp##_t *) buf; \
459 \
460 for (i = 0; i < count; i++) { \
461 \
462 rgb = *src++; \
463 rep = 0; \
464 while (i < count && *src == rgb) { \
465 rep++, src++, i++; \
466 } \
467 idx = palette_idx(palette, rgb); \
468 /* \
469 * Should never happen, but don't break everything \
470 * if it does, use the first color instead \
471 */ \
472 if (idx == (uint8_t)-1) { \
473 idx = 0; \
474 } \
475 while (rep >= 0) { \
476 *buf++ = idx; \
477 rep--; \
478 } \
479 } \
480 }
481
482 DEFINE_IDX_ENCODE_FUNCTION(16)
483 DEFINE_IDX_ENCODE_FUNCTION(32)
484
485 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
486 \
487 static void \
488 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
489 uint##bpp##_t bg, uint##bpp##_t fg) { \
490 uint##bpp##_t *ptr; \
491 unsigned int value, mask; \
492 int aligned_width; \
493 int x, y, bg_bits; \
494 \
495 ptr = (uint##bpp##_t *) buf; \
496 aligned_width = w - w % 8; \
497 \
498 for (y = 0; y < h; y++) { \
499 for (x = 0; x < aligned_width; x += 8) { \
500 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
501 if (*ptr++ != bg) { \
502 break; \
503 } \
504 } \
505 if (bg_bits == 8) { \
506 *buf++ = 0; \
507 continue; \
508 } \
509 mask = 0x80 >> bg_bits; \
510 value = mask; \
511 for (bg_bits++; bg_bits < 8; bg_bits++) { \
512 mask >>= 1; \
513 if (*ptr++ != bg) { \
514 value |= mask; \
515 } \
516 } \
517 *buf++ = (uint8_t)value; \
518 } \
519 \
520 mask = 0x80; \
521 value = 0; \
522 if (x >= w) { \
523 continue; \
524 } \
525 \
526 for (; x < w; x++) { \
527 if (*ptr++ != bg) { \
528 value |= mask; \
529 } \
530 mask >>= 1; \
531 } \
532 *buf++ = (uint8_t)value; \
533 } \
534 }
535
536 DEFINE_MONO_ENCODE_FUNCTION(8)
537 DEFINE_MONO_ENCODE_FUNCTION(16)
538 DEFINE_MONO_ENCODE_FUNCTION(32)
539
540 /*
541 * ``Gradient'' filter for 24-bit color samples.
542 * Should be called only when redMax, greenMax and blueMax are 255.
543 * Color components assumed to be byte-aligned.
544 */
545
546 static void
547 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
548 {
549 uint32_t *buf32;
550 uint32_t pix32;
551 int shift[3];
552 int *prev;
553 int here[3], upper[3], left[3], upperleft[3];
554 int prediction;
555 int x, y, c;
556
557 buf32 = (uint32_t *)buf;
558 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));
559
560 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
561 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
562 shift[0] = vs->clientds.pf.rshift;
563 shift[1] = vs->clientds.pf.gshift;
564 shift[2] = vs->clientds.pf.bshift;
565 } else {
566 shift[0] = 24 - vs->clientds.pf.rshift;
567 shift[1] = 24 - vs->clientds.pf.gshift;
568 shift[2] = 24 - vs->clientds.pf.bshift;
569 }
570
571 for (y = 0; y < h; y++) {
572 for (c = 0; c < 3; c++) {
573 upper[c] = 0;
574 here[c] = 0;
575 }
576 prev = (int *)vs->tight.gradient.buffer;
577 for (x = 0; x < w; x++) {
578 pix32 = *buf32++;
579 for (c = 0; c < 3; c++) {
580 upperleft[c] = upper[c];
581 left[c] = here[c];
582 upper[c] = *prev;
583 here[c] = (int)(pix32 >> shift[c] & 0xFF);
584 *prev++ = here[c];
585
586 prediction = left[c] + upper[c] - upperleft[c];
587 if (prediction < 0) {
588 prediction = 0;
589 } else if (prediction > 0xFF) {
590 prediction = 0xFF;
591 }
592 *buf++ = (char)(here[c] - prediction);
593 }
594 }
595 }
596 }
597
598
599 /*
600 * ``Gradient'' filter for other color depths.
601 */
602
603 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
604 \
605 static void \
606 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
607 int w, int h) { \
608 uint##bpp##_t pix, diff; \
609 bool endian; \
610 int *prev; \
611 int max[3], shift[3]; \
612 int here[3], upper[3], left[3], upperleft[3]; \
613 int prediction; \
614 int x, y, c; \
615 \
616 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \
617 \
618 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
619 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
620 \
621 max[0] = vs->clientds.pf.rmax; \
622 max[1] = vs->clientds.pf.gmax; \
623 max[2] = vs->clientds.pf.bmax; \
624 shift[0] = vs->clientds.pf.rshift; \
625 shift[1] = vs->clientds.pf.gshift; \
626 shift[2] = vs->clientds.pf.bshift; \
627 \
628 for (y = 0; y < h; y++) { \
629 for (c = 0; c < 3; c++) { \
630 upper[c] = 0; \
631 here[c] = 0; \
632 } \
633 prev = (int *)vs->tight.gradient.buffer; \
634 for (x = 0; x < w; x++) { \
635 pix = *buf; \
636 if (endian) { \
637 pix = bswap##bpp(pix); \
638 } \
639 diff = 0; \
640 for (c = 0; c < 3; c++) { \
641 upperleft[c] = upper[c]; \
642 left[c] = here[c]; \
643 upper[c] = *prev; \
644 here[c] = (int)(pix >> shift[c] & max[c]); \
645 *prev++ = here[c]; \
646 \
647 prediction = left[c] + upper[c] - upperleft[c]; \
648 if (prediction < 0) { \
649 prediction = 0; \
650 } else if (prediction > max[c]) { \
651 prediction = max[c]; \
652 } \
653 diff |= ((here[c] - prediction) & max[c]) \
654 << shift[c]; \
655 } \
656 if (endian) { \
657 diff = bswap##bpp(diff); \
658 } \
659 *buf++ = diff; \
660 } \
661 } \
662 }
663
664 DEFINE_GRADIENT_FILTER_FUNCTION(16)
665 DEFINE_GRADIENT_FILTER_FUNCTION(32)
666
667 /*
668 * Check if a rectangle is all of the same color. If needSameColor is
669 * set to non-zero, then also check that its color equals to the
670 * *colorPtr value. The result is 1 if the test is successful, and in
671 * that case new color will be stored in *colorPtr.
672 */
673
674 #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
675 \
676 static bool \
677 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \
678 uint32_t* color, bool samecolor) \
679 { \
680 VncDisplay *vd = vs->vd; \
681 uint##bpp##_t *fbptr; \
682 uint##bpp##_t c; \
683 int dx, dy; \
684 \
685 fbptr = (uint##bpp##_t *) \
686 (vd->server->data + y * ds_get_linesize(vs->ds) + \
687 x * ds_get_bytes_per_pixel(vs->ds)); \
688 \
689 c = *fbptr; \
690 if (samecolor && (uint32_t)c != *color) { \
691 return false; \
692 } \
693 \
694 for (dy = 0; dy < h; dy++) { \
695 for (dx = 0; dx < w; dx++) { \
696 if (c != fbptr[dx]) { \
697 return false; \
698 } \
699 } \
700 fbptr = (uint##bpp##_t *) \
701 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \
702 } \
703 \
704 *color = (uint32_t)c; \
705 return true; \
706 }
707
708 DEFINE_CHECK_SOLID_FUNCTION(32)
709 DEFINE_CHECK_SOLID_FUNCTION(16)
710 DEFINE_CHECK_SOLID_FUNCTION(8)
711
712 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
713 uint32_t* color, bool samecolor)
714 {
715 VncDisplay *vd = vs->vd;
716
717 switch(vd->server->pf.bytes_per_pixel) {
718 case 4:
719 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
720 case 2:
721 return check_solid_tile16(vs, x, y, w, h, color, samecolor);
722 default:
723 return check_solid_tile8(vs, x, y, w, h, color, samecolor);
724 }
725 }
726
727 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
728 uint32_t color, int *w_ptr, int *h_ptr)
729 {
730 int dx, dy, dw, dh;
731 int w_prev;
732 int w_best = 0, h_best = 0;
733
734 w_prev = w;
735
736 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
737
738 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
739 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
740
741 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
742 break;
743 }
744
745 for (dx = x + dw; dx < x + w_prev;) {
746 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
747
748 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
749 break;
750 }
751 dx += dw;
752 }
753
754 w_prev = dx - x;
755 if (w_prev * (dy + dh - y) > w_best * h_best) {
756 w_best = w_prev;
757 h_best = dy + dh - y;
758 }
759 }
760
761 *w_ptr = w_best;
762 *h_ptr = h_best;
763 }
764
765 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
766 uint32_t color, int *x_ptr, int *y_ptr,
767 int *w_ptr, int *h_ptr)
768 {
769 int cx, cy;
770
771 /* Try to extend the area upwards. */
772 for ( cy = *y_ptr - 1;
773 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
774 cy-- );
775 *h_ptr += *y_ptr - (cy + 1);
776 *y_ptr = cy + 1;
777
778 /* ... downwards. */
779 for ( cy = *y_ptr + *h_ptr;
780 cy < y + h &&
781 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
782 cy++ );
783 *h_ptr += cy - (*y_ptr + *h_ptr);
784
785 /* ... to the left. */
786 for ( cx = *x_ptr - 1;
787 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
788 cx-- );
789 *w_ptr += *x_ptr - (cx + 1);
790 *x_ptr = cx + 1;
791
792 /* ... to the right. */
793 for ( cx = *x_ptr + *w_ptr;
794 cx < x + w &&
795 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
796 cx++ );
797 *w_ptr += cx - (*x_ptr + *w_ptr);
798 }
799
800 static int tight_init_stream(VncState *vs, int stream_id,
801 int level, int strategy)
802 {
803 z_streamp zstream = &vs->tight.stream[stream_id];
804
805 if (zstream->opaque == NULL) {
806 int err;
807
808 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
809 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
810 zstream->zalloc = vnc_zlib_zalloc;
811 zstream->zfree = vnc_zlib_zfree;
812
813 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
814 MAX_MEM_LEVEL, strategy);
815
816 if (err != Z_OK) {
817 fprintf(stderr, "VNC: error initializing zlib\n");
818 return -1;
819 }
820
821 vs->tight.levels[stream_id] = level;
822 zstream->opaque = vs;
823 }
824
825 if (vs->tight.levels[stream_id] != level) {
826 if (deflateParams(zstream, level, strategy) != Z_OK) {
827 return -1;
828 }
829 vs->tight.levels[stream_id] = level;
830 }
831 return 0;
832 }
833
834 static void tight_send_compact_size(VncState *vs, size_t len)
835 {
836 int lpc = 0;
837 int bytes = 0;
838 char buf[3] = {0, 0, 0};
839
840 buf[bytes++] = len & 0x7F;
841 if (len > 0x7F) {
842 buf[bytes-1] |= 0x80;
843 buf[bytes++] = (len >> 7) & 0x7F;
844 if (len > 0x3FFF) {
845 buf[bytes-1] |= 0x80;
846 buf[bytes++] = (len >> 14) & 0xFF;
847 }
848 }
849 for (lpc = 0; lpc < bytes; lpc++) {
850 vnc_write_u8(vs, buf[lpc]);
851 }
852 }
853
854 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
855 int level, int strategy)
856 {
857 z_streamp zstream = &vs->tight.stream[stream_id];
858 int previous_out;
859
860 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
861 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
862 return bytes;
863 }
864
865 if (tight_init_stream(vs, stream_id, level, strategy)) {
866 return -1;
867 }
868
869 /* reserve memory in output buffer */
870 buffer_reserve(&vs->tight.zlib, bytes + 64);
871
872 /* set pointers */
873 zstream->next_in = vs->tight.tight.buffer;
874 zstream->avail_in = vs->tight.tight.offset;
875 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
876 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
877 previous_out = zstream->avail_out;
878 zstream->data_type = Z_BINARY;
879
880 /* start encoding */
881 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
882 fprintf(stderr, "VNC: error during tight compression\n");
883 return -1;
884 }
885
886 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
887 /* ...how much data has actually been produced by deflate() */
888 bytes = previous_out - zstream->avail_out;
889
890 tight_send_compact_size(vs, bytes);
891 vnc_write(vs, vs->tight.zlib.buffer, bytes);
892
893 buffer_reset(&vs->tight.zlib);
894
895 return bytes;
896 }
897
898 /*
899 * Subencoding implementations.
900 */
901 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
902 {
903 uint32_t *buf32;
904 uint32_t pix;
905 int rshift, gshift, bshift;
906
907 buf32 = (uint32_t *)buf;
908
909 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
910 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
911 rshift = vs->clientds.pf.rshift;
912 gshift = vs->clientds.pf.gshift;
913 bshift = vs->clientds.pf.bshift;
914 } else {
915 rshift = 24 - vs->clientds.pf.rshift;
916 gshift = 24 - vs->clientds.pf.gshift;
917 bshift = 24 - vs->clientds.pf.bshift;
918 }
919
920 if (ret) {
921 *ret = count * 3;
922 }
923
924 while (count--) {
925 pix = *buf32++;
926 *buf++ = (char)(pix >> rshift);
927 *buf++ = (char)(pix >> gshift);
928 *buf++ = (char)(pix >> bshift);
929 }
930 }
931
932 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
933 {
934 int stream = 0;
935 ssize_t bytes;
936
937 #ifdef CONFIG_VNC_PNG
938 if (tight_can_send_png_rect(vs, w, h)) {
939 return send_png_rect(vs, x, y, w, h, NULL);
940 }
941 #endif
942
943 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
944
945 if (vs->tight.pixel24) {
946 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset);
947 bytes = 3;
948 } else {
949 bytes = vs->clientds.pf.bytes_per_pixel;
950 }
951
952 bytes = tight_compress_data(vs, stream, w * h * bytes,
953 tight_conf[vs->tight.compression].raw_zlib_level,
954 Z_DEFAULT_STRATEGY);
955
956 return (bytes >= 0);
957 }
958
959 static int send_solid_rect(VncState *vs)
960 {
961 size_t bytes;
962
963 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
964
965 if (vs->tight.pixel24) {
966 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset);
967 bytes = 3;
968 } else {
969 bytes = vs->clientds.pf.bytes_per_pixel;
970 }
971
972 vnc_write(vs, vs->tight.tight.buffer, bytes);
973 return 1;
974 }
975
976 static int send_mono_rect(VncState *vs, int x, int y,
977 int w, int h, uint32_t bg, uint32_t fg)
978 {
979 ssize_t bytes;
980 int stream = 1;
981 int level = tight_conf[vs->tight.compression].mono_zlib_level;
982
983 #ifdef CONFIG_VNC_PNG
984 if (tight_can_send_png_rect(vs, w, h)) {
985 int ret;
986 int bpp = vs->clientds.pf.bytes_per_pixel * 8;
987 VncPalette *palette = palette_new(2, bpp);
988
989 palette_put(palette, bg);
990 palette_put(palette, fg);
991 ret = send_png_rect(vs, x, y, w, h, palette);
992 palette_destroy(palette);
993 return ret;
994 }
995 #endif
996
997 bytes = ((w + 7) / 8) * h;
998
999 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1000 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1001 vnc_write_u8(vs, 1);
1002
1003 switch(vs->clientds.pf.bytes_per_pixel) {
1004 case 4:
1005 {
1006 uint32_t buf[2] = {bg, fg};
1007 size_t ret = sizeof (buf);
1008
1009 if (vs->tight.pixel24) {
1010 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
1011 }
1012 vnc_write(vs, buf, ret);
1013
1014 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg);
1015 break;
1016 }
1017 case 2:
1018 vnc_write(vs, &bg, 2);
1019 vnc_write(vs, &fg, 2);
1020 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg);
1021 break;
1022 default:
1023 vnc_write_u8(vs, bg);
1024 vnc_write_u8(vs, fg);
1025 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg);
1026 break;
1027 }
1028 vs->tight.tight.offset = bytes;
1029
1030 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1031 return (bytes >= 0);
1032 }
1033
1034 struct palette_cb_priv {
1035 VncState *vs;
1036 uint8_t *header;
1037 #ifdef CONFIG_VNC_PNG
1038 png_colorp png_palette;
1039 #endif
1040 };
1041
1042 static void write_palette(int idx, uint32_t color, void *opaque)
1043 {
1044 struct palette_cb_priv *priv = opaque;
1045 VncState *vs = priv->vs;
1046 uint32_t bytes = vs->clientds.pf.bytes_per_pixel;
1047
1048 if (bytes == 4) {
1049 ((uint32_t*)priv->header)[idx] = color;
1050 } else {
1051 ((uint16_t*)priv->header)[idx] = color;
1052 }
1053 }
1054
1055 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h)
1056 {
1057 int stream = 3;
1058 int level = tight_conf[vs->tight.compression].gradient_zlib_level;
1059 ssize_t bytes;
1060
1061 if (vs->clientds.pf.bytes_per_pixel == 1)
1062 return send_full_color_rect(vs, x, y, w, h);
1063
1064 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1065 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1066
1067 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int));
1068
1069 if (vs->tight.pixel24) {
1070 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h);
1071 bytes = 3;
1072 } else if (vs->clientds.pf.bytes_per_pixel == 4) {
1073 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h);
1074 bytes = 4;
1075 } else {
1076 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h);
1077 bytes = 2;
1078 }
1079
1080 buffer_reset(&vs->tight.gradient);
1081
1082 bytes = w * h * bytes;
1083 vs->tight.tight.offset = bytes;
1084
1085 bytes = tight_compress_data(vs, stream, bytes,
1086 level, Z_FILTERED);
1087 return (bytes >= 0);
1088 }
1089
1090 static int send_palette_rect(VncState *vs, int x, int y,
1091 int w, int h, VncPalette *palette)
1092 {
1093 int stream = 2;
1094 int level = tight_conf[vs->tight.compression].idx_zlib_level;
1095 int colors;
1096 ssize_t bytes;
1097
1098 #ifdef CONFIG_VNC_PNG
1099 if (tight_can_send_png_rect(vs, w, h)) {
1100 return send_png_rect(vs, x, y, w, h, palette);
1101 }
1102 #endif
1103
1104 colors = palette_size(palette);
1105
1106 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1107 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1108 vnc_write_u8(vs, colors - 1);
1109
1110 switch(vs->clientds.pf.bytes_per_pixel) {
1111 case 4:
1112 {
1113 size_t old_offset, offset;
1114 uint32_t header[palette_size(palette)];
1115 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1116
1117 old_offset = vs->output.offset;
1118 palette_iter(palette, write_palette, &priv);
1119 vnc_write(vs, header, sizeof(header));
1120
1121 if (vs->tight.pixel24) {
1122 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1123 vs->output.offset = old_offset + offset;
1124 }
1125
1126 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1127 break;
1128 }
1129 case 2:
1130 {
1131 uint16_t header[palette_size(palette)];
1132 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1133
1134 palette_iter(palette, write_palette, &priv);
1135 vnc_write(vs, header, sizeof(header));
1136 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1137 break;
1138 }
1139 default:
1140 return -1; /* No palette for 8bits colors */
1141 break;
1142 }
1143 bytes = w * h;
1144 vs->tight.tight.offset = bytes;
1145
1146 bytes = tight_compress_data(vs, stream, bytes,
1147 level, Z_DEFAULT_STRATEGY);
1148 return (bytes >= 0);
1149 }
1150
1151 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG)
1152 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y,
1153 int count)
1154 {
1155 VncDisplay *vd = vs->vd;
1156 uint32_t *fbptr;
1157 uint32_t pix;
1158
1159 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) +
1160 x * ds_get_bytes_per_pixel(vs->ds));
1161
1162 while (count--) {
1163 pix = *fbptr++;
1164 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift);
1165 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift);
1166 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift);
1167 }
1168 }
1169
1170 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp) \
1171 \
1172 static void \
1173 rgb_prepare_row##bpp(VncState *vs, uint8_t *dst, \
1174 int x, int y, int count) \
1175 { \
1176 VncDisplay *vd = vs->vd; \
1177 uint##bpp##_t *fbptr; \
1178 uint##bpp##_t pix; \
1179 int r, g, b; \
1180 \
1181 fbptr = (uint##bpp##_t *) \
1182 (vd->server->data + y * ds_get_linesize(vs->ds) + \
1183 x * ds_get_bytes_per_pixel(vs->ds)); \
1184 \
1185 while (count--) { \
1186 pix = *fbptr++; \
1187 \
1188 r = (int)((pix >> vs->ds->surface->pf.rshift) \
1189 & vs->ds->surface->pf.rmax); \
1190 g = (int)((pix >> vs->ds->surface->pf.gshift) \
1191 & vs->ds->surface->pf.gmax); \
1192 b = (int)((pix >> vs->ds->surface->pf.bshift) \
1193 & vs->ds->surface->pf.bmax); \
1194 \
1195 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \
1196 / vs->ds->surface->pf.rmax); \
1197 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \
1198 / vs->ds->surface->pf.gmax); \
1199 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \
1200 / vs->ds->surface->pf.bmax); \
1201 } \
1202 }
1203
1204 DEFINE_RGB_GET_ROW_FUNCTION(16)
1205 DEFINE_RGB_GET_ROW_FUNCTION(32)
1206
1207 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y,
1208 int count)
1209 {
1210 if (ds_get_bytes_per_pixel(vs->ds) == 4) {
1211 if (vs->ds->surface->pf.rmax == 0xFF &&
1212 vs->ds->surface->pf.gmax == 0xFF &&
1213 vs->ds->surface->pf.bmax == 0xFF) {
1214 rgb_prepare_row24(vs, dst, x, y, count);
1215 } else {
1216 rgb_prepare_row32(vs, dst, x, y, count);
1217 }
1218 } else {
1219 rgb_prepare_row16(vs, dst, x, y, count);
1220 }
1221 }
1222 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */
1223
1224 /*
1225 * JPEG compression stuff.
1226 */
1227 #ifdef CONFIG_VNC_JPEG
1228 /*
1229 * Destination manager implementation for JPEG library.
1230 */
1231
1232 /* This is called once per encoding */
1233 static void jpeg_init_destination(j_compress_ptr cinfo)
1234 {
1235 VncState *vs = cinfo->client_data;
1236 Buffer *buffer = &vs->tight.jpeg;
1237
1238 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1239 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1240 }
1241
1242 /* This is called when we ran out of buffer (shouldn't happen!) */
1243 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1244 {
1245 VncState *vs = cinfo->client_data;
1246 Buffer *buffer = &vs->tight.jpeg;
1247
1248 buffer->offset = buffer->capacity;
1249 buffer_reserve(buffer, 2048);
1250 jpeg_init_destination(cinfo);
1251 return TRUE;
1252 }
1253
1254 /* This is called when we are done processing data */
1255 static void jpeg_term_destination(j_compress_ptr cinfo)
1256 {
1257 VncState *vs = cinfo->client_data;
1258 Buffer *buffer = &vs->tight.jpeg;
1259
1260 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1261 }
1262
1263 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1264 {
1265 struct jpeg_compress_struct cinfo;
1266 struct jpeg_error_mgr jerr;
1267 struct jpeg_destination_mgr manager;
1268 JSAMPROW row[1];
1269 uint8_t *buf;
1270 int dy;
1271
1272 if (ds_get_bytes_per_pixel(vs->ds) == 1)
1273 return send_full_color_rect(vs, x, y, w, h);
1274
1275 buffer_reserve(&vs->tight.jpeg, 2048);
1276
1277 cinfo.err = jpeg_std_error(&jerr);
1278 jpeg_create_compress(&cinfo);
1279
1280 cinfo.client_data = vs;
1281 cinfo.image_width = w;
1282 cinfo.image_height = h;
1283 cinfo.input_components = 3;
1284 cinfo.in_color_space = JCS_RGB;
1285
1286 jpeg_set_defaults(&cinfo);
1287 jpeg_set_quality(&cinfo, quality, true);
1288
1289 manager.init_destination = jpeg_init_destination;
1290 manager.empty_output_buffer = jpeg_empty_output_buffer;
1291 manager.term_destination = jpeg_term_destination;
1292 cinfo.dest = &manager;
1293
1294 jpeg_start_compress(&cinfo, true);
1295
1296 buf = g_malloc(w * 3);
1297 row[0] = buf;
1298 for (dy = 0; dy < h; dy++) {
1299 rgb_prepare_row(vs, buf, x, y + dy, w);
1300 jpeg_write_scanlines(&cinfo, row, 1);
1301 }
1302 g_free(buf);
1303
1304 jpeg_finish_compress(&cinfo);
1305 jpeg_destroy_compress(&cinfo);
1306
1307 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1308
1309 tight_send_compact_size(vs, vs->tight.jpeg.offset);
1310 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset);
1311 buffer_reset(&vs->tight.jpeg);
1312
1313 return 1;
1314 }
1315 #endif /* CONFIG_VNC_JPEG */
1316
1317 /*
1318 * PNG compression stuff.
1319 */
1320 #ifdef CONFIG_VNC_PNG
1321 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1322 {
1323 struct palette_cb_priv *priv = opaque;
1324 VncState *vs = priv->vs;
1325 png_colorp color = &priv->png_palette[idx];
1326
1327 if (vs->tight.pixel24)
1328 {
1329 color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1330 color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1331 color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1332 }
1333 else
1334 {
1335 int red, green, blue;
1336
1337 red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1338 green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1339 blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1340 color->red = ((red * 255 + vs->clientds.pf.rmax / 2) /
1341 vs->clientds.pf.rmax);
1342 color->green = ((green * 255 + vs->clientds.pf.gmax / 2) /
1343 vs->clientds.pf.gmax);
1344 color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) /
1345 vs->clientds.pf.bmax);
1346 }
1347 }
1348
1349 static void png_write_data(png_structp png_ptr, png_bytep data,
1350 png_size_t length)
1351 {
1352 VncState *vs = png_get_io_ptr(png_ptr);
1353
1354 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length);
1355 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length);
1356
1357 vs->tight.png.offset += length;
1358 }
1359
1360 static void png_flush_data(png_structp png_ptr)
1361 {
1362 }
1363
1364 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1365 {
1366 return g_malloc(size);
1367 }
1368
1369 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1370 {
1371 g_free(ptr);
1372 }
1373
1374 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1375 VncPalette *palette)
1376 {
1377 png_byte color_type;
1378 png_structp png_ptr;
1379 png_infop info_ptr;
1380 png_colorp png_palette = NULL;
1381 int level = tight_png_conf[vs->tight.compression].png_zlib_level;
1382 int filters = tight_png_conf[vs->tight.compression].png_filters;
1383 uint8_t *buf;
1384 int dy;
1385
1386 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1387 NULL, vnc_png_malloc, vnc_png_free);
1388
1389 if (png_ptr == NULL)
1390 return -1;
1391
1392 info_ptr = png_create_info_struct(png_ptr);
1393
1394 if (info_ptr == NULL) {
1395 png_destroy_write_struct(&png_ptr, NULL);
1396 return -1;
1397 }
1398
1399 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1400 png_set_compression_level(png_ptr, level);
1401 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1402
1403 if (palette) {
1404 color_type = PNG_COLOR_TYPE_PALETTE;
1405 } else {
1406 color_type = PNG_COLOR_TYPE_RGB;
1407 }
1408
1409 png_set_IHDR(png_ptr, info_ptr, w, h,
1410 8, color_type, PNG_INTERLACE_NONE,
1411 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1412
1413 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1414 struct palette_cb_priv priv;
1415
1416 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1417 palette_size(palette));
1418
1419 priv.vs = vs;
1420 priv.png_palette = png_palette;
1421 palette_iter(palette, write_png_palette, &priv);
1422
1423 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1424
1425 if (vs->clientds.pf.bytes_per_pixel == 4) {
1426 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1427 } else {
1428 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1429 }
1430 }
1431
1432 png_write_info(png_ptr, info_ptr);
1433
1434 buffer_reserve(&vs->tight.png, 2048);
1435 buf = g_malloc(w * 3);
1436 for (dy = 0; dy < h; dy++)
1437 {
1438 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1439 memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1440 } else {
1441 rgb_prepare_row(vs, buf, x, y + dy, w);
1442 }
1443 png_write_row(png_ptr, buf);
1444 }
1445 g_free(buf);
1446
1447 png_write_end(png_ptr, NULL);
1448
1449 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1450 png_free(png_ptr, png_palette);
1451 }
1452
1453 png_destroy_write_struct(&png_ptr, &info_ptr);
1454
1455 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1456
1457 tight_send_compact_size(vs, vs->tight.png.offset);
1458 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1459 buffer_reset(&vs->tight.png);
1460 return 1;
1461 }
1462 #endif /* CONFIG_VNC_PNG */
1463
1464 static void vnc_tight_start(VncState *vs)
1465 {
1466 buffer_reset(&vs->tight.tight);
1467
1468 // make the output buffer be the zlib buffer, so we can compress it later
1469 vs->tight.tmp = vs->output;
1470 vs->output = vs->tight.tight;
1471 }
1472
1473 static void vnc_tight_stop(VncState *vs)
1474 {
1475 // switch back to normal output/zlib buffers
1476 vs->tight.tight = vs->output;
1477 vs->output = vs->tight.tmp;
1478 }
1479
1480 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1481 int bg, int fg, int colors, VncPalette *palette)
1482 {
1483 int ret;
1484
1485 if (colors == 0) {
1486 if (tight_detect_smooth_image(vs, w, h)) {
1487 ret = send_gradient_rect(vs, x, y, w, h);
1488 } else {
1489 ret = send_full_color_rect(vs, x, y, w, h);
1490 }
1491 } else if (colors == 1) {
1492 ret = send_solid_rect(vs);
1493 } else if (colors == 2) {
1494 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1495 } else if (colors <= 256) {
1496 ret = send_palette_rect(vs, x, y, w, h, palette);
1497 } else {
1498 ret = 0;
1499 }
1500 return ret;
1501 }
1502
1503 #ifdef CONFIG_VNC_JPEG
1504 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1505 int bg, int fg, int colors,
1506 VncPalette *palette, bool force)
1507 {
1508 int ret;
1509
1510 if (colors == 0) {
1511 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full &&
1512 tight_detect_smooth_image(vs, w, h))) {
1513 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1514
1515 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1516 } else {
1517 ret = send_full_color_rect(vs, x, y, w, h);
1518 }
1519 } else if (colors == 1) {
1520 ret = send_solid_rect(vs);
1521 } else if (colors == 2) {
1522 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1523 } else if (colors <= 256) {
1524 if (force || (colors > 96 &&
1525 tight_jpeg_conf[vs->tight.quality].jpeg_idx &&
1526 tight_detect_smooth_image(vs, w, h))) {
1527 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1528
1529 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1530 } else {
1531 ret = send_palette_rect(vs, x, y, w, h, palette);
1532 }
1533 } else {
1534 ret = 0;
1535 }
1536 return ret;
1537 }
1538 #endif
1539
1540 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1541 {
1542 VncPalette *palette = NULL;
1543 uint32_t bg = 0, fg = 0;
1544 int colors;
1545 int ret = 0;
1546 #ifdef CONFIG_VNC_JPEG
1547 bool force_jpeg = false;
1548 bool allow_jpeg = true;
1549 #endif
1550
1551 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1552
1553 vnc_tight_start(vs);
1554 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1555 vnc_tight_stop(vs);
1556
1557 #ifdef CONFIG_VNC_JPEG
1558 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) {
1559 double freq = vnc_update_freq(vs, x, y, w, h);
1560
1561 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) {
1562 allow_jpeg = false;
1563 }
1564 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1565 force_jpeg = true;
1566 vnc_sent_lossy_rect(vs, x, y, w, h);
1567 }
1568 }
1569 #endif
1570
1571 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
1572
1573 #ifdef CONFIG_VNC_JPEG
1574 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) {
1575 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette,
1576 force_jpeg);
1577 } else {
1578 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1579 }
1580 #else
1581 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1582 #endif
1583
1584 palette_destroy(palette);
1585 return ret;
1586 }
1587
1588 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1589 {
1590 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1591
1592 vnc_tight_start(vs);
1593 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1594 vnc_tight_stop(vs);
1595
1596 return send_solid_rect(vs);
1597 }
1598
1599 static int send_rect_simple(VncState *vs, int x, int y, int w, int h,
1600 bool split)
1601 {
1602 int max_size, max_width;
1603 int max_sub_width, max_sub_height;
1604 int dx, dy;
1605 int rw, rh;
1606 int n = 0;
1607
1608 max_size = tight_conf[vs->tight.compression].max_rect_size;
1609 max_width = tight_conf[vs->tight.compression].max_rect_width;
1610
1611 if (split && (w > max_width || w * h > max_size)) {
1612 max_sub_width = (w > max_width) ? max_width : w;
1613 max_sub_height = max_size / max_sub_width;
1614
1615 for (dy = 0; dy < h; dy += max_sub_height) {
1616 for (dx = 0; dx < w; dx += max_width) {
1617 rw = MIN(max_sub_width, w - dx);
1618 rh = MIN(max_sub_height, h - dy);
1619 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1620 }
1621 }
1622 } else {
1623 n += send_sub_rect(vs, x, y, w, h);
1624 }
1625
1626 return n;
1627 }
1628
1629 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1630 int w, int h, int max_rows)
1631 {
1632 int dx, dy, dw, dh;
1633 int n = 0;
1634
1635 /* Try to find large solid-color areas and send them separately. */
1636
1637 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1638
1639 /* If a rectangle becomes too large, send its upper part now. */
1640
1641 if (dy - y >= max_rows) {
1642 n += send_rect_simple(vs, x, y, w, max_rows, true);
1643 y += max_rows;
1644 h -= max_rows;
1645 }
1646
1647 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1648
1649 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1650 uint32_t color_value;
1651 int x_best, y_best, w_best, h_best;
1652
1653 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1654
1655 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1656 continue ;
1657 }
1658
1659 /* Get dimensions of solid-color area. */
1660
1661 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1662 color_value, &w_best, &h_best);
1663
1664 /* Make sure a solid rectangle is large enough
1665 (or the whole rectangle is of the same color). */
1666
1667 if (w_best * h_best != w * h &&
1668 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1669 continue;
1670 }
1671
1672 /* Try to extend solid rectangle to maximum size. */
1673
1674 x_best = dx; y_best = dy;
1675 extend_solid_area(vs, x, y, w, h, color_value,
1676 &x_best, &y_best, &w_best, &h_best);
1677
1678 /* Send rectangles at top and left to solid-color area. */
1679
1680 if (y_best != y) {
1681 n += send_rect_simple(vs, x, y, w, y_best-y, true);
1682 }
1683 if (x_best != x) {
1684 n += tight_send_framebuffer_update(vs, x, y_best,
1685 x_best-x, h_best);
1686 }
1687
1688 /* Send solid-color rectangle. */
1689 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1690
1691 /* Send remaining rectangles (at right and bottom). */
1692
1693 if (x_best + w_best != x + w) {
1694 n += tight_send_framebuffer_update(vs, x_best+w_best,
1695 y_best,
1696 w-(x_best-x)-w_best,
1697 h_best);
1698 }
1699 if (y_best + h_best != y + h) {
1700 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1701 w, h-(y_best-y)-h_best);
1702 }
1703
1704 /* Return after all recursive calls are done. */
1705 return n;
1706 }
1707 }
1708 return n + send_rect_simple(vs, x, y, w, h, true);
1709 }
1710
1711 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1712 int w, int h)
1713 {
1714 int max_rows;
1715
1716 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
1717 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
1718 vs->tight.pixel24 = true;
1719 } else {
1720 vs->tight.pixel24 = false;
1721 }
1722
1723 #ifdef CONFIG_VNC_JPEG
1724 if (vs->tight.quality != (uint8_t)-1) {
1725 double freq = vnc_update_freq(vs, x, y, w, h);
1726
1727 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1728 return send_rect_simple(vs, x, y, w, h, false);
1729 }
1730 }
1731 #endif
1732
1733 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1734 return send_rect_simple(vs, x, y, w, h, true);
1735 }
1736
1737 /* Calculate maximum number of rows in one non-solid rectangle. */
1738
1739 max_rows = tight_conf[vs->tight.compression].max_rect_size;
1740 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1741
1742 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1743 }
1744
1745 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1746 int w, int h)
1747 {
1748 vs->tight.type = VNC_ENCODING_TIGHT;
1749 return tight_send_framebuffer_update(vs, x, y, w, h);
1750 }
1751
1752 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1753 int w, int h)
1754 {
1755 vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1756 return tight_send_framebuffer_update(vs, x, y, w, h);
1757 }
1758
1759 void vnc_tight_clear(VncState *vs)
1760 {
1761 int i;
1762 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1763 if (vs->tight.stream[i].opaque) {
1764 deflateEnd(&vs->tight.stream[i]);
1765 }
1766 }
1767
1768 buffer_free(&vs->tight.tight);
1769 buffer_free(&vs->tight.zlib);
1770 buffer_free(&vs->tight.gradient);
1771 #ifdef CONFIG_VNC_JPEG
1772 buffer_free(&vs->tight.jpeg);
1773 #endif
1774 #ifdef CONFIG_VNC_PNG
1775 buffer_free(&vs->tight.png);
1776 #endif
1777 }
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