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Fix some typos in comments and documentation
[qemu.git] / ui / vnc-enc-tight.c
blob87fdf35d3ea11d8cc8bdab7e37c6d4e4f6011990
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 #ifdef CONFIG_VNC_PNG
32 #include <png.h>
33 #endif
34 #ifdef CONFIG_VNC_JPEG
35 #include <stdio.h>
36 #include <jpeglib.h>
37 #endif
38
39 #include "qemu-common.h"
40
41 #include "bswap.h"
42 #include "qint.h"
43 #include "vnc.h"
44 #include "vnc-enc-tight.h"
45 #include "vnc-palette.h"
46
47 /* Compression level stuff. The following array contains various
48 encoder parameters for each of 10 compression levels (0..9).
49 Last three parameters correspond to JPEG quality levels (0..9). */
50
51 static const struct {
52 int max_rect_size, max_rect_width;
53 int mono_min_rect_size, gradient_min_rect_size;
54 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
55 int gradient_threshold, gradient_threshold24;
56 int idx_max_colors_divisor;
57 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
58 } tight_conf[] = {
59 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
60 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
61 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
62 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
63 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
64 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
65 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
66 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
67 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
68 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
69 };
70
71
72 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
73 int w, int h);
74
75 #ifdef CONFIG_VNC_JPEG
76 static const struct {
77 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */
78 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
79 int jpeg_idx; /* Allow indexed JPEG */
80 int jpeg_full; /* Allow full color JPEG */
81 } tight_jpeg_conf[] = {
82 { 0, 8, 1, 1 },
83 { 0, 8, 1, 1 },
84 { 0, 8, 1, 1 },
85 { 0, 8, 1, 1 },
86 { 0, 10, 1, 1 },
87 { 0.1, 10, 1, 1 },
88 { 0.2, 10, 1, 1 },
89 { 0.3, 12, 0, 0 },
90 { 0.4, 14, 0, 0 },
91 { 0.5, 16, 0, 0 },
92 };
93 #endif
94
95 #ifdef CONFIG_VNC_PNG
96 static const struct {
97 int png_zlib_level, png_filters;
98 } tight_png_conf[] = {
99 { 0, PNG_NO_FILTERS },
100 { 1, PNG_NO_FILTERS },
101 { 2, PNG_NO_FILTERS },
102 { 3, PNG_NO_FILTERS },
103 { 4, PNG_NO_FILTERS },
104 { 5, PNG_ALL_FILTERS },
105 { 6, PNG_ALL_FILTERS },
106 { 7, PNG_ALL_FILTERS },
107 { 8, PNG_ALL_FILTERS },
108 { 9, PNG_ALL_FILTERS },
109 };
110
111 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
112 VncPalette *palette);
113
114 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
115 {
116 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
117 return false;
118 }
119
120 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
121 vs->clientds.pf.bytes_per_pixel == 1) {
122 return false;
123 }
124
125 return true;
126 }
127 #endif
128
129 /*
130 * Code to guess if given rectangle is suitable for smooth image
131 * compression (by applying "gradient" filter or JPEG coder).
132 */
133
134 static unsigned int
135 tight_detect_smooth_image24(VncState *vs, int w, int h)
136 {
137 int off;
138 int x, y, d, dx;
139 unsigned int c;
140 unsigned int stats[256];
141 int pixels = 0;
142 int pix, left[3];
143 unsigned int errors;
144 unsigned char *buf = vs->tight.tight.buffer;
145
146 /*
147 * If client is big-endian, color samples begin from the second
148 * byte (offset 1) of a 32-bit pixel value.
149 */
150 off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG);
151
152 memset(stats, 0, sizeof (stats));
153
154 for (y = 0, x = 0; y < h && x < w;) {
155 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
156 d++) {
157 for (c = 0; c < 3; c++) {
158 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
159 }
160 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
161 for (c = 0; c < 3; c++) {
162 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
163 stats[abs(pix - left[c])]++;
164 left[c] = pix;
165 }
166 pixels++;
167 }
168 }
169 if (w > h) {
170 x += h;
171 y = 0;
172 } else {
173 x = 0;
174 y += w;
175 }
176 }
177
178 /* 95% smooth or more ... */
179 if (stats[0] * 33 / pixels >= 95) {
180 return 0;
181 }
182
183 errors = 0;
184 for (c = 1; c < 8; c++) {
185 errors += stats[c] * (c * c);
186 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
187 return 0;
188 }
189 }
190 for (; c < 256; c++) {
191 errors += stats[c] * (c * c);
192 }
193 errors /= (pixels * 3 - stats[0]);
194
195 return errors;
196 }
197
198 #define DEFINE_DETECT_FUNCTION(bpp) \
199 \
200 static unsigned int \
201 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
202 bool endian; \
203 uint##bpp##_t pix; \
204 int max[3], shift[3]; \
205 int x, y, d, dx; \
206 unsigned int c; \
207 unsigned int stats[256]; \
208 int pixels = 0; \
209 int sample, sum, left[3]; \
210 unsigned int errors; \
211 unsigned char *buf = vs->tight.tight.buffer; \
212 \
213 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
214 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
215 \
216 \
217 max[0] = vs->clientds.pf.rmax; \
218 max[1] = vs->clientds.pf.gmax; \
219 max[2] = vs->clientds.pf.bmax; \
220 shift[0] = vs->clientds.pf.rshift; \
221 shift[1] = vs->clientds.pf.gshift; \
222 shift[2] = vs->clientds.pf.bshift; \
223 \
224 memset(stats, 0, sizeof(stats)); \
225 \
226 y = 0, x = 0; \
227 while (y < h && x < w) { \
228 for (d = 0; d < h - y && \
229 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
230 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
231 if (endian) { \
232 pix = bswap##bpp(pix); \
233 } \
234 for (c = 0; c < 3; c++) { \
235 left[c] = (int)(pix >> shift[c] & max[c]); \
236 } \
237 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
238 dx++) { \
239 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
240 if (endian) { \
241 pix = bswap##bpp(pix); \
242 } \
243 sum = 0; \
244 for (c = 0; c < 3; c++) { \
245 sample = (int)(pix >> shift[c] & max[c]); \
246 sum += abs(sample - left[c]); \
247 left[c] = sample; \
248 } \
249 if (sum > 255) { \
250 sum = 255; \
251 } \
252 stats[sum]++; \
253 pixels++; \
254 } \
255 } \
256 if (w > h) { \
257 x += h; \
258 y = 0; \
259 } else { \
260 x = 0; \
261 y += w; \
262 } \
263 } \
264 \
265 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
266 return 0; \
267 } \
268 \
269 errors = 0; \
270 for (c = 1; c < 8; c++) { \
271 errors += stats[c] * (c * c); \
272 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
273 return 0; \
274 } \
275 } \
276 for (; c < 256; c++) { \
277 errors += stats[c] * (c * c); \
278 } \
279 errors /= (pixels - stats[0]); \
280 \
281 return errors; \
282 }
283
284 DEFINE_DETECT_FUNCTION(16)
285 DEFINE_DETECT_FUNCTION(32)
286
287 static int
288 tight_detect_smooth_image(VncState *vs, int w, int h)
289 {
290 unsigned int errors;
291 int compression = vs->tight.compression;
292 int quality = vs->tight.quality;
293
294 if (!vs->vd->lossy) {
295 return 0;
296 }
297
298 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
299 vs->clientds.pf.bytes_per_pixel == 1 ||
300 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
301 return 0;
302 }
303
304 if (vs->tight.quality != (uint8_t)-1) {
305 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
306 return 0;
307 }
308 } else {
309 if (w * h < tight_conf[compression].gradient_min_rect_size) {
310 return 0;
311 }
312 }
313
314 if (vs->clientds.pf.bytes_per_pixel == 4) {
315 if (vs->tight.pixel24) {
316 errors = tight_detect_smooth_image24(vs, w, h);
317 if (vs->tight.quality != (uint8_t)-1) {
318 return (errors < tight_conf[quality].jpeg_threshold24);
319 }
320 return (errors < tight_conf[compression].gradient_threshold24);
321 } else {
322 errors = tight_detect_smooth_image32(vs, w, h);
323 }
324 } else {
325 errors = tight_detect_smooth_image16(vs, w, h);
326 }
327 if (quality != -1) {
328 return (errors < tight_conf[quality].jpeg_threshold);
329 }
330 return (errors < tight_conf[compression].gradient_threshold);
331 }
332
333 /*
334 * Code to determine how many different colors used in rectangle.
335 */
336 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
337 \
338 static int \
339 tight_fill_palette##bpp(VncState *vs, int x, int y, \
340 int max, size_t count, \
341 uint32_t *bg, uint32_t *fg, \
342 VncPalette **palette) { \
343 uint##bpp##_t *data; \
344 uint##bpp##_t c0, c1, ci; \
345 int i, n0, n1; \
346 \
347 data = (uint##bpp##_t *)vs->tight.tight.buffer; \
348 \
349 c0 = data[0]; \
350 i = 1; \
351 while (i < count && data[i] == c0) \
352 i++; \
353 if (i >= count) { \
354 *bg = *fg = c0; \
355 return 1; \
356 } \
357 \
358 if (max < 2) { \
359 return 0; \
360 } \
361 \
362 n0 = i; \
363 c1 = data[i]; \
364 n1 = 0; \
365 for (i++; i < count; i++) { \
366 ci = data[i]; \
367 if (ci == c0) { \
368 n0++; \
369 } else if (ci == c1) { \
370 n1++; \
371 } else \
372 break; \
373 } \
374 if (i >= count) { \
375 if (n0 > n1) { \
376 *bg = (uint32_t)c0; \
377 *fg = (uint32_t)c1; \
378 } else { \
379 *bg = (uint32_t)c1; \
380 *fg = (uint32_t)c0; \
381 } \
382 return 2; \
383 } \
384 \
385 if (max == 2) { \
386 return 0; \
387 } \
388 \
389 *palette = palette_new(max, bpp); \
390 palette_put(*palette, c0); \
391 palette_put(*palette, c1); \
392 palette_put(*palette, ci); \
393 \
394 for (i++; i < count; i++) { \
395 if (data[i] == ci) { \
396 continue; \
397 } else { \
398 ci = data[i]; \
399 if (!palette_put(*palette, (uint32_t)ci)) { \
400 return 0; \
401 } \
402 } \
403 } \
404 \
405 return palette_size(*palette); \
406 }
407
408 DEFINE_FILL_PALETTE_FUNCTION(8)
409 DEFINE_FILL_PALETTE_FUNCTION(16)
410 DEFINE_FILL_PALETTE_FUNCTION(32)
411
412 static int tight_fill_palette(VncState *vs, int x, int y,
413 size_t count, uint32_t *bg, uint32_t *fg,
414 VncPalette **palette)
415 {
416 int max;
417
418 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
419 if (max < 2 &&
420 count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
421 max = 2;
422 }
423 if (max >= 256) {
424 max = 256;
425 }
426
427 switch(vs->clientds.pf.bytes_per_pixel) {
428 case 4:
429 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
430 case 2:
431 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
432 default:
433 max = 2;
434 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
435 }
436 return 0;
437 }
438
439 /*
440 * Converting truecolor samples into palette indices.
441 */
442 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
443 \
444 static void \
445 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
446 VncPalette *palette) { \
447 uint##bpp##_t *src; \
448 uint##bpp##_t rgb; \
449 int i, rep; \
450 uint8_t idx; \
451 \
452 src = (uint##bpp##_t *) buf; \
453 \
454 for (i = 0; i < count; i++) { \
455 \
456 rgb = *src++; \
457 rep = 0; \
458 while (i < count && *src == rgb) { \
459 rep++, src++, i++; \
460 } \
461 idx = palette_idx(palette, rgb); \
462 /* \
463 * Should never happen, but don't break everything \
464 * if it does, use the first color instead \
465 */ \
466 if (idx == (uint8_t)-1) { \
467 idx = 0; \
468 } \
469 while (rep >= 0) { \
470 *buf++ = idx; \
471 rep--; \
472 } \
473 } \
474 }
475
476 DEFINE_IDX_ENCODE_FUNCTION(16)
477 DEFINE_IDX_ENCODE_FUNCTION(32)
478
479 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
480 \
481 static void \
482 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
483 uint##bpp##_t bg, uint##bpp##_t fg) { \
484 uint##bpp##_t *ptr; \
485 unsigned int value, mask; \
486 int aligned_width; \
487 int x, y, bg_bits; \
488 \
489 ptr = (uint##bpp##_t *) buf; \
490 aligned_width = w - w % 8; \
491 \
492 for (y = 0; y < h; y++) { \
493 for (x = 0; x < aligned_width; x += 8) { \
494 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
495 if (*ptr++ != bg) { \
496 break; \
497 } \
498 } \
499 if (bg_bits == 8) { \
500 *buf++ = 0; \
501 continue; \
502 } \
503 mask = 0x80 >> bg_bits; \
504 value = mask; \
505 for (bg_bits++; bg_bits < 8; bg_bits++) { \
506 mask >>= 1; \
507 if (*ptr++ != bg) { \
508 value |= mask; \
509 } \
510 } \
511 *buf++ = (uint8_t)value; \
512 } \
513 \
514 mask = 0x80; \
515 value = 0; \
516 if (x >= w) { \
517 continue; \
518 } \
519 \
520 for (; x < w; x++) { \
521 if (*ptr++ != bg) { \
522 value |= mask; \
523 } \
524 mask >>= 1; \
525 } \
526 *buf++ = (uint8_t)value; \
527 } \
528 }
529
530 DEFINE_MONO_ENCODE_FUNCTION(8)
531 DEFINE_MONO_ENCODE_FUNCTION(16)
532 DEFINE_MONO_ENCODE_FUNCTION(32)
533
534 /*
535 * ``Gradient'' filter for 24-bit color samples.
536 * Should be called only when redMax, greenMax and blueMax are 255.
537 * Color components assumed to be byte-aligned.
538 */
539
540 static void
541 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
542 {
543 uint32_t *buf32;
544 uint32_t pix32;
545 int shift[3];
546 int *prev;
547 int here[3], upper[3], left[3], upperleft[3];
548 int prediction;
549 int x, y, c;
550
551 buf32 = (uint32_t *)buf;
552 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));
553
554 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
555 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
556 shift[0] = vs->clientds.pf.rshift;
557 shift[1] = vs->clientds.pf.gshift;
558 shift[2] = vs->clientds.pf.bshift;
559 } else {
560 shift[0] = 24 - vs->clientds.pf.rshift;
561 shift[1] = 24 - vs->clientds.pf.gshift;
562 shift[2] = 24 - vs->clientds.pf.bshift;
563 }
564
565 for (y = 0; y < h; y++) {
566 for (c = 0; c < 3; c++) {
567 upper[c] = 0;
568 here[c] = 0;
569 }
570 prev = (int *)vs->tight.gradient.buffer;
571 for (x = 0; x < w; x++) {
572 pix32 = *buf32++;
573 for (c = 0; c < 3; c++) {
574 upperleft[c] = upper[c];
575 left[c] = here[c];
576 upper[c] = *prev;
577 here[c] = (int)(pix32 >> shift[c] & 0xFF);
578 *prev++ = here[c];
579
580 prediction = left[c] + upper[c] - upperleft[c];
581 if (prediction < 0) {
582 prediction = 0;
583 } else if (prediction > 0xFF) {
584 prediction = 0xFF;
585 }
586 *buf++ = (char)(here[c] - prediction);
587 }
588 }
589 }
590 }
591
592
593 /*
594 * ``Gradient'' filter for other color depths.
595 */
596
597 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
598 \
599 static void \
600 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
601 int w, int h) { \
602 uint##bpp##_t pix, diff; \
603 bool endian; \
604 int *prev; \
605 int max[3], shift[3]; \
606 int here[3], upper[3], left[3], upperleft[3]; \
607 int prediction; \
608 int x, y, c; \
609 \
610 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \
611 \
612 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
613 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
614 \
615 max[0] = vs->clientds.pf.rmax; \
616 max[1] = vs->clientds.pf.gmax; \
617 max[2] = vs->clientds.pf.bmax; \
618 shift[0] = vs->clientds.pf.rshift; \
619 shift[1] = vs->clientds.pf.gshift; \
620 shift[2] = vs->clientds.pf.bshift; \
621 \
622 for (y = 0; y < h; y++) { \
623 for (c = 0; c < 3; c++) { \
624 upper[c] = 0; \
625 here[c] = 0; \
626 } \
627 prev = (int *)vs->tight.gradient.buffer; \
628 for (x = 0; x < w; x++) { \
629 pix = *buf; \
630 if (endian) { \
631 pix = bswap##bpp(pix); \
632 } \
633 diff = 0; \
634 for (c = 0; c < 3; c++) { \
635 upperleft[c] = upper[c]; \
636 left[c] = here[c]; \
637 upper[c] = *prev; \
638 here[c] = (int)(pix >> shift[c] & max[c]); \
639 *prev++ = here[c]; \
640 \
641 prediction = left[c] + upper[c] - upperleft[c]; \
642 if (prediction < 0) { \
643 prediction = 0; \
644 } else if (prediction > max[c]) { \
645 prediction = max[c]; \
646 } \
647 diff |= ((here[c] - prediction) & max[c]) \
648 << shift[c]; \
649 } \
650 if (endian) { \
651 diff = bswap##bpp(diff); \
652 } \
653 *buf++ = diff; \
654 } \
655 } \
656 }
657
658 DEFINE_GRADIENT_FILTER_FUNCTION(16)
659 DEFINE_GRADIENT_FILTER_FUNCTION(32)
660
661 /*
662 * Check if a rectangle is all of the same color. If needSameColor is
663 * set to non-zero, then also check that its color equals to the
664 * *colorPtr value. The result is 1 if the test is successful, and in
665 * that case new color will be stored in *colorPtr.
666 */
667
668 #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
669 \
670 static bool \
671 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \
672 uint32_t* color, bool samecolor) \
673 { \
674 VncDisplay *vd = vs->vd; \
675 uint##bpp##_t *fbptr; \
676 uint##bpp##_t c; \
677 int dx, dy; \
678 \
679 fbptr = (uint##bpp##_t *) \
680 (vd->server->data + y * ds_get_linesize(vs->ds) + \
681 x * ds_get_bytes_per_pixel(vs->ds)); \
682 \
683 c = *fbptr; \
684 if (samecolor && (uint32_t)c != *color) { \
685 return false; \
686 } \
687 \
688 for (dy = 0; dy < h; dy++) { \
689 for (dx = 0; dx < w; dx++) { \
690 if (c != fbptr[dx]) { \
691 return false; \
692 } \
693 } \
694 fbptr = (uint##bpp##_t *) \
695 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \
696 } \
697 \
698 *color = (uint32_t)c; \
699 return true; \
700 }
701
702 DEFINE_CHECK_SOLID_FUNCTION(32)
703 DEFINE_CHECK_SOLID_FUNCTION(16)
704 DEFINE_CHECK_SOLID_FUNCTION(8)
705
706 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
707 uint32_t* color, bool samecolor)
708 {
709 VncDisplay *vd = vs->vd;
710
711 switch(vd->server->pf.bytes_per_pixel) {
712 case 4:
713 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
714 case 2:
715 return check_solid_tile16(vs, x, y, w, h, color, samecolor);
716 default:
717 return check_solid_tile8(vs, x, y, w, h, color, samecolor);
718 }
719 }
720
721 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
722 uint32_t color, int *w_ptr, int *h_ptr)
723 {
724 int dx, dy, dw, dh;
725 int w_prev;
726 int w_best = 0, h_best = 0;
727
728 w_prev = w;
729
730 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
731
732 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
733 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
734
735 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
736 break;
737 }
738
739 for (dx = x + dw; dx < x + w_prev;) {
740 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
741
742 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
743 break;
744 }
745 dx += dw;
746 }
747
748 w_prev = dx - x;
749 if (w_prev * (dy + dh - y) > w_best * h_best) {
750 w_best = w_prev;
751 h_best = dy + dh - y;
752 }
753 }
754
755 *w_ptr = w_best;
756 *h_ptr = h_best;
757 }
758
759 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
760 uint32_t color, int *x_ptr, int *y_ptr,
761 int *w_ptr, int *h_ptr)
762 {
763 int cx, cy;
764
765 /* Try to extend the area upwards. */
766 for ( cy = *y_ptr - 1;
767 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
768 cy-- );
769 *h_ptr += *y_ptr - (cy + 1);
770 *y_ptr = cy + 1;
771
772 /* ... downwards. */
773 for ( cy = *y_ptr + *h_ptr;
774 cy < y + h &&
775 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
776 cy++ );
777 *h_ptr += cy - (*y_ptr + *h_ptr);
778
779 /* ... to the left. */
780 for ( cx = *x_ptr - 1;
781 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
782 cx-- );
783 *w_ptr += *x_ptr - (cx + 1);
784 *x_ptr = cx + 1;
785
786 /* ... to the right. */
787 for ( cx = *x_ptr + *w_ptr;
788 cx < x + w &&
789 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
790 cx++ );
791 *w_ptr += cx - (*x_ptr + *w_ptr);
792 }
793
794 static int tight_init_stream(VncState *vs, int stream_id,
795 int level, int strategy)
796 {
797 z_streamp zstream = &vs->tight.stream[stream_id];
798
799 if (zstream->opaque == NULL) {
800 int err;
801
802 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
803 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
804 zstream->zalloc = vnc_zlib_zalloc;
805 zstream->zfree = vnc_zlib_zfree;
806
807 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
808 MAX_MEM_LEVEL, strategy);
809
810 if (err != Z_OK) {
811 fprintf(stderr, "VNC: error initializing zlib\n");
812 return -1;
813 }
814
815 vs->tight.levels[stream_id] = level;
816 zstream->opaque = vs;
817 }
818
819 if (vs->tight.levels[stream_id] != level) {
820 if (deflateParams(zstream, level, strategy) != Z_OK) {
821 return -1;
822 }
823 vs->tight.levels[stream_id] = level;
824 }
825 return 0;
826 }
827
828 static void tight_send_compact_size(VncState *vs, size_t len)
829 {
830 int lpc = 0;
831 int bytes = 0;
832 char buf[3] = {0, 0, 0};
833
834 buf[bytes++] = len & 0x7F;
835 if (len > 0x7F) {
836 buf[bytes-1] |= 0x80;
837 buf[bytes++] = (len >> 7) & 0x7F;
838 if (len > 0x3FFF) {
839 buf[bytes-1] |= 0x80;
840 buf[bytes++] = (len >> 14) & 0xFF;
841 }
842 }
843 for (lpc = 0; lpc < bytes; lpc++) {
844 vnc_write_u8(vs, buf[lpc]);
845 }
846 }
847
848 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
849 int level, int strategy)
850 {
851 z_streamp zstream = &vs->tight.stream[stream_id];
852 int previous_out;
853
854 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
855 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
856 return bytes;
857 }
858
859 if (tight_init_stream(vs, stream_id, level, strategy)) {
860 return -1;
861 }
862
863 /* reserve memory in output buffer */
864 buffer_reserve(&vs->tight.zlib, bytes + 64);
865
866 /* set pointers */
867 zstream->next_in = vs->tight.tight.buffer;
868 zstream->avail_in = vs->tight.tight.offset;
869 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
870 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
871 previous_out = zstream->avail_out;
872 zstream->data_type = Z_BINARY;
873
874 /* start encoding */
875 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
876 fprintf(stderr, "VNC: error during tight compression\n");
877 return -1;
878 }
879
880 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
881 /* ...how much data has actually been produced by deflate() */
882 bytes = previous_out - zstream->avail_out;
883
884 tight_send_compact_size(vs, bytes);
885 vnc_write(vs, vs->tight.zlib.buffer, bytes);
886
887 buffer_reset(&vs->tight.zlib);
888
889 return bytes;
890 }
891
892 /*
893 * Subencoding implementations.
894 */
895 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
896 {
897 uint32_t *buf32;
898 uint32_t pix;
899 int rshift, gshift, bshift;
900
901 buf32 = (uint32_t *)buf;
902
903 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
904 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
905 rshift = vs->clientds.pf.rshift;
906 gshift = vs->clientds.pf.gshift;
907 bshift = vs->clientds.pf.bshift;
908 } else {
909 rshift = 24 - vs->clientds.pf.rshift;
910 gshift = 24 - vs->clientds.pf.gshift;
911 bshift = 24 - vs->clientds.pf.bshift;
912 }
913
914 if (ret) {
915 *ret = count * 3;
916 }
917
918 while (count--) {
919 pix = *buf32++;
920 *buf++ = (char)(pix >> rshift);
921 *buf++ = (char)(pix >> gshift);
922 *buf++ = (char)(pix >> bshift);
923 }
924 }
925
926 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
927 {
928 int stream = 0;
929 ssize_t bytes;
930
931 #ifdef CONFIG_VNC_PNG
932 if (tight_can_send_png_rect(vs, w, h)) {
933 return send_png_rect(vs, x, y, w, h, NULL);
934 }
935 #endif
936
937 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
938
939 if (vs->tight.pixel24) {
940 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset);
941 bytes = 3;
942 } else {
943 bytes = vs->clientds.pf.bytes_per_pixel;
944 }
945
946 bytes = tight_compress_data(vs, stream, w * h * bytes,
947 tight_conf[vs->tight.compression].raw_zlib_level,
948 Z_DEFAULT_STRATEGY);
949
950 return (bytes >= 0);
951 }
952
953 static int send_solid_rect(VncState *vs)
954 {
955 size_t bytes;
956
957 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
958
959 if (vs->tight.pixel24) {
960 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset);
961 bytes = 3;
962 } else {
963 bytes = vs->clientds.pf.bytes_per_pixel;
964 }
965
966 vnc_write(vs, vs->tight.tight.buffer, bytes);
967 return 1;
968 }
969
970 static int send_mono_rect(VncState *vs, int x, int y,
971 int w, int h, uint32_t bg, uint32_t fg)
972 {
973 ssize_t bytes;
974 int stream = 1;
975 int level = tight_conf[vs->tight.compression].mono_zlib_level;
976
977 #ifdef CONFIG_VNC_PNG
978 if (tight_can_send_png_rect(vs, w, h)) {
979 int ret;
980 int bpp = vs->clientds.pf.bytes_per_pixel * 8;
981 VncPalette *palette = palette_new(2, bpp);
982
983 palette_put(palette, bg);
984 palette_put(palette, fg);
985 ret = send_png_rect(vs, x, y, w, h, palette);
986 palette_destroy(palette);
987 return ret;
988 }
989 #endif
990
991 bytes = ((w + 7) / 8) * h;
992
993 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
994 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
995 vnc_write_u8(vs, 1);
996
997 switch(vs->clientds.pf.bytes_per_pixel) {
998 case 4:
999 {
1000 uint32_t buf[2] = {bg, fg};
1001 size_t ret = sizeof (buf);
1002
1003 if (vs->tight.pixel24) {
1004 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
1005 }
1006 vnc_write(vs, buf, ret);
1007
1008 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg);
1009 break;
1010 }
1011 case 2:
1012 vnc_write(vs, &bg, 2);
1013 vnc_write(vs, &fg, 2);
1014 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg);
1015 break;
1016 default:
1017 vnc_write_u8(vs, bg);
1018 vnc_write_u8(vs, fg);
1019 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg);
1020 break;
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_VNC_PNG
1032 png_colorp png_palette;
1033 #endif
1034 };
1035
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->clientds.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
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->clientds.pf.bytes_per_pixel == 1)
1056 return send_full_color_rect(vs, x, y, w, h);
1057
1058 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1059 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1060
1061 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int));
1062
1063 if (vs->tight.pixel24) {
1064 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h);
1065 bytes = 3;
1066 } else if (vs->clientds.pf.bytes_per_pixel == 4) {
1067 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h);
1068 bytes = 4;
1069 } else {
1070 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h);
1071 bytes = 2;
1072 }
1073
1074 buffer_reset(&vs->tight.gradient);
1075
1076 bytes = w * h * bytes;
1077 vs->tight.tight.offset = bytes;
1078
1079 bytes = tight_compress_data(vs, stream, bytes,
1080 level, Z_FILTERED);
1081 return (bytes >= 0);
1082 }
1083
1084 static int send_palette_rect(VncState *vs, int x, int y,
1085 int w, int h, VncPalette *palette)
1086 {
1087 int stream = 2;
1088 int level = tight_conf[vs->tight.compression].idx_zlib_level;
1089 int colors;
1090 ssize_t bytes;
1091
1092 #ifdef CONFIG_VNC_PNG
1093 if (tight_can_send_png_rect(vs, w, h)) {
1094 return send_png_rect(vs, x, y, w, h, palette);
1095 }
1096 #endif
1097
1098 colors = palette_size(palette);
1099
1100 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1101 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1102 vnc_write_u8(vs, colors - 1);
1103
1104 switch(vs->clientds.pf.bytes_per_pixel) {
1105 case 4:
1106 {
1107 size_t old_offset, offset;
1108 uint32_t header[palette_size(palette)];
1109 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1110
1111 old_offset = vs->output.offset;
1112 palette_iter(palette, write_palette, &priv);
1113 vnc_write(vs, header, sizeof(header));
1114
1115 if (vs->tight.pixel24) {
1116 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1117 vs->output.offset = old_offset + offset;
1118 }
1119
1120 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1121 break;
1122 }
1123 case 2:
1124 {
1125 uint16_t header[palette_size(palette)];
1126 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1127
1128 palette_iter(palette, write_palette, &priv);
1129 vnc_write(vs, header, sizeof(header));
1130 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1131 break;
1132 }
1133 default:
1134 return -1; /* No palette for 8bits colors */
1135 break;
1136 }
1137 bytes = w * h;
1138 vs->tight.tight.offset = bytes;
1139
1140 bytes = tight_compress_data(vs, stream, bytes,
1141 level, Z_DEFAULT_STRATEGY);
1142 return (bytes >= 0);
1143 }
1144
1145 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG)
1146 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y,
1147 int count)
1148 {
1149 VncDisplay *vd = vs->vd;
1150 uint32_t *fbptr;
1151 uint32_t pix;
1152
1153 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) +
1154 x * ds_get_bytes_per_pixel(vs->ds));
1155
1156 while (count--) {
1157 pix = *fbptr++;
1158 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift);
1159 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift);
1160 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift);
1161 }
1162 }
1163
1164 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp) \
1165 \
1166 static void \
1167 rgb_prepare_row##bpp(VncState *vs, uint8_t *dst, \
1168 int x, int y, int count) \
1169 { \
1170 VncDisplay *vd = vs->vd; \
1171 uint##bpp##_t *fbptr; \
1172 uint##bpp##_t pix; \
1173 int r, g, b; \
1174 \
1175 fbptr = (uint##bpp##_t *) \
1176 (vd->server->data + y * ds_get_linesize(vs->ds) + \
1177 x * ds_get_bytes_per_pixel(vs->ds)); \
1178 \
1179 while (count--) { \
1180 pix = *fbptr++; \
1181 \
1182 r = (int)((pix >> vs->ds->surface->pf.rshift) \
1183 & vs->ds->surface->pf.rmax); \
1184 g = (int)((pix >> vs->ds->surface->pf.gshift) \
1185 & vs->ds->surface->pf.gmax); \
1186 b = (int)((pix >> vs->ds->surface->pf.bshift) \
1187 & vs->ds->surface->pf.bmax); \
1188 \
1189 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \
1190 / vs->ds->surface->pf.rmax); \
1191 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \
1192 / vs->ds->surface->pf.gmax); \
1193 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \
1194 / vs->ds->surface->pf.bmax); \
1195 } \
1196 }
1197
1198 DEFINE_RGB_GET_ROW_FUNCTION(16)
1199 DEFINE_RGB_GET_ROW_FUNCTION(32)
1200
1201 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y,
1202 int count)
1203 {
1204 if (ds_get_bytes_per_pixel(vs->ds) == 4) {
1205 if (vs->ds->surface->pf.rmax == 0xFF &&
1206 vs->ds->surface->pf.gmax == 0xFF &&
1207 vs->ds->surface->pf.bmax == 0xFF) {
1208 rgb_prepare_row24(vs, dst, x, y, count);
1209 } else {
1210 rgb_prepare_row32(vs, dst, x, y, count);
1211 }
1212 } else {
1213 rgb_prepare_row16(vs, dst, x, y, count);
1214 }
1215 }
1216 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */
1217
1218 /*
1219 * JPEG compression stuff.
1220 */
1221 #ifdef CONFIG_VNC_JPEG
1222 /*
1223 * Destination manager implementation for JPEG library.
1224 */
1225
1226 /* This is called once per encoding */
1227 static void jpeg_init_destination(j_compress_ptr cinfo)
1228 {
1229 VncState *vs = cinfo->client_data;
1230 Buffer *buffer = &vs->tight.jpeg;
1231
1232 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1233 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1234 }
1235
1236 /* This is called when we ran out of buffer (shouldn't happen!) */
1237 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1238 {
1239 VncState *vs = cinfo->client_data;
1240 Buffer *buffer = &vs->tight.jpeg;
1241
1242 buffer->offset = buffer->capacity;
1243 buffer_reserve(buffer, 2048);
1244 jpeg_init_destination(cinfo);
1245 return TRUE;
1246 }
1247
1248 /* This is called when we are done processing data */
1249 static void jpeg_term_destination(j_compress_ptr cinfo)
1250 {
1251 VncState *vs = cinfo->client_data;
1252 Buffer *buffer = &vs->tight.jpeg;
1253
1254 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1255 }
1256
1257 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1258 {
1259 struct jpeg_compress_struct cinfo;
1260 struct jpeg_error_mgr jerr;
1261 struct jpeg_destination_mgr manager;
1262 JSAMPROW row[1];
1263 uint8_t *buf;
1264 int dy;
1265
1266 if (ds_get_bytes_per_pixel(vs->ds) == 1)
1267 return send_full_color_rect(vs, x, y, w, h);
1268
1269 buffer_reserve(&vs->tight.jpeg, 2048);
1270
1271 cinfo.err = jpeg_std_error(&jerr);
1272 jpeg_create_compress(&cinfo);
1273
1274 cinfo.client_data = vs;
1275 cinfo.image_width = w;
1276 cinfo.image_height = h;
1277 cinfo.input_components = 3;
1278 cinfo.in_color_space = JCS_RGB;
1279
1280 jpeg_set_defaults(&cinfo);
1281 jpeg_set_quality(&cinfo, quality, true);
1282
1283 manager.init_destination = jpeg_init_destination;
1284 manager.empty_output_buffer = jpeg_empty_output_buffer;
1285 manager.term_destination = jpeg_term_destination;
1286 cinfo.dest = &manager;
1287
1288 jpeg_start_compress(&cinfo, true);
1289
1290 buf = qemu_malloc(w * 3);
1291 row[0] = buf;
1292 for (dy = 0; dy < h; dy++) {
1293 rgb_prepare_row(vs, buf, x, y + dy, w);
1294 jpeg_write_scanlines(&cinfo, row, 1);
1295 }
1296 qemu_free(buf);
1297
1298 jpeg_finish_compress(&cinfo);
1299 jpeg_destroy_compress(&cinfo);
1300
1301 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1302
1303 tight_send_compact_size(vs, vs->tight.jpeg.offset);
1304 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset);
1305 buffer_reset(&vs->tight.jpeg);
1306
1307 return 1;
1308 }
1309 #endif /* CONFIG_VNC_JPEG */
1310
1311 /*
1312 * PNG compression stuff.
1313 */
1314 #ifdef CONFIG_VNC_PNG
1315 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1316 {
1317 struct palette_cb_priv *priv = opaque;
1318 VncState *vs = priv->vs;
1319 png_colorp color = &priv->png_palette[idx];
1320
1321 if (vs->tight.pixel24)
1322 {
1323 color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1324 color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1325 color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1326 }
1327 else
1328 {
1329 int red, green, blue;
1330
1331 red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1332 green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1333 blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1334 color->red = ((red * 255 + vs->clientds.pf.rmax / 2) /
1335 vs->clientds.pf.rmax);
1336 color->green = ((green * 255 + vs->clientds.pf.gmax / 2) /
1337 vs->clientds.pf.gmax);
1338 color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) /
1339 vs->clientds.pf.bmax);
1340 }
1341 }
1342
1343 static void png_write_data(png_structp png_ptr, png_bytep data,
1344 png_size_t length)
1345 {
1346 VncState *vs = png_get_io_ptr(png_ptr);
1347
1348 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length);
1349 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length);
1350
1351 vs->tight.png.offset += length;
1352 }
1353
1354 static void png_flush_data(png_structp png_ptr)
1355 {
1356 }
1357
1358 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1359 {
1360 return qemu_malloc(size);
1361 }
1362
1363 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1364 {
1365 qemu_free(ptr);
1366 }
1367
1368 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1369 VncPalette *palette)
1370 {
1371 png_byte color_type;
1372 png_structp png_ptr;
1373 png_infop info_ptr;
1374 png_colorp png_palette = NULL;
1375 int level = tight_png_conf[vs->tight.compression].png_zlib_level;
1376 int filters = tight_png_conf[vs->tight.compression].png_filters;
1377 uint8_t *buf;
1378 int dy;
1379
1380 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1381 NULL, vnc_png_malloc, vnc_png_free);
1382
1383 if (png_ptr == NULL)
1384 return -1;
1385
1386 info_ptr = png_create_info_struct(png_ptr);
1387
1388 if (info_ptr == NULL) {
1389 png_destroy_write_struct(&png_ptr, NULL);
1390 return -1;
1391 }
1392
1393 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1394 png_set_compression_level(png_ptr, level);
1395 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1396
1397 if (palette) {
1398 color_type = PNG_COLOR_TYPE_PALETTE;
1399 } else {
1400 color_type = PNG_COLOR_TYPE_RGB;
1401 }
1402
1403 png_set_IHDR(png_ptr, info_ptr, w, h,
1404 8, color_type, PNG_INTERLACE_NONE,
1405 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1406
1407 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1408 struct palette_cb_priv priv;
1409
1410 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1411 palette_size(palette));
1412
1413 priv.vs = vs;
1414 priv.png_palette = png_palette;
1415 palette_iter(palette, write_png_palette, &priv);
1416
1417 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1418
1419 if (vs->clientds.pf.bytes_per_pixel == 4) {
1420 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1421 } else {
1422 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1423 }
1424 }
1425
1426 png_write_info(png_ptr, info_ptr);
1427
1428 buffer_reserve(&vs->tight.png, 2048);
1429 buf = qemu_malloc(w * 3);
1430 for (dy = 0; dy < h; dy++)
1431 {
1432 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1433 memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1434 } else {
1435 rgb_prepare_row(vs, buf, x, y + dy, w);
1436 }
1437 png_write_row(png_ptr, buf);
1438 }
1439 qemu_free(buf);
1440
1441 png_write_end(png_ptr, NULL);
1442
1443 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1444 png_free(png_ptr, png_palette);
1445 }
1446
1447 png_destroy_write_struct(&png_ptr, &info_ptr);
1448
1449 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1450
1451 tight_send_compact_size(vs, vs->tight.png.offset);
1452 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1453 buffer_reset(&vs->tight.png);
1454 return 1;
1455 }
1456 #endif /* CONFIG_VNC_PNG */
1457
1458 static void vnc_tight_start(VncState *vs)
1459 {
1460 buffer_reset(&vs->tight.tight);
1461
1462 // make the output buffer be the zlib buffer, so we can compress it later
1463 vs->tight.tmp = vs->output;
1464 vs->output = vs->tight.tight;
1465 }
1466
1467 static void vnc_tight_stop(VncState *vs)
1468 {
1469 // switch back to normal output/zlib buffers
1470 vs->tight.tight = vs->output;
1471 vs->output = vs->tight.tmp;
1472 }
1473
1474 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1475 int bg, int fg, int colors, VncPalette *palette)
1476 {
1477 int ret;
1478
1479 if (colors == 0) {
1480 if (tight_detect_smooth_image(vs, w, h)) {
1481 ret = send_gradient_rect(vs, x, y, w, h);
1482 } else {
1483 ret = send_full_color_rect(vs, x, y, w, h);
1484 }
1485 } else if (colors == 1) {
1486 ret = send_solid_rect(vs);
1487 } else if (colors == 2) {
1488 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1489 } else if (colors <= 256) {
1490 ret = send_palette_rect(vs, x, y, w, h, palette);
1491 } else {
1492 ret = 0;
1493 }
1494 return ret;
1495 }
1496
1497 #ifdef CONFIG_VNC_JPEG
1498 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1499 int bg, int fg, int colors,
1500 VncPalette *palette, bool force)
1501 {
1502 int ret;
1503
1504 if (colors == 0) {
1505 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full &&
1506 tight_detect_smooth_image(vs, w, h))) {
1507 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1508
1509 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1510 } else {
1511 ret = send_full_color_rect(vs, x, y, w, h);
1512 }
1513 } else if (colors == 1) {
1514 ret = send_solid_rect(vs);
1515 } else if (colors == 2) {
1516 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1517 } else if (colors <= 256) {
1518 if (force || (colors > 96 &&
1519 tight_jpeg_conf[vs->tight.quality].jpeg_idx &&
1520 tight_detect_smooth_image(vs, w, h))) {
1521 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1522
1523 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1524 } else {
1525 ret = send_palette_rect(vs, x, y, w, h, palette);
1526 }
1527 } else {
1528 ret = 0;
1529 }
1530 return ret;
1531 }
1532 #endif
1533
1534 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1535 {
1536 VncPalette *palette = NULL;
1537 uint32_t bg = 0, fg = 0;
1538 int colors;
1539 int ret = 0;
1540 #ifdef CONFIG_VNC_JPEG
1541 bool force_jpeg = false;
1542 bool allow_jpeg = true;
1543 #endif
1544
1545 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1546
1547 vnc_tight_start(vs);
1548 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1549 vnc_tight_stop(vs);
1550
1551 #ifdef CONFIG_VNC_JPEG
1552 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) {
1553 double freq = vnc_update_freq(vs, x, y, w, h);
1554
1555 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) {
1556 allow_jpeg = false;
1557 }
1558 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1559 force_jpeg = true;
1560 vnc_sent_lossy_rect(vs, x, y, w, h);
1561 }
1562 }
1563 #endif
1564
1565 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
1566
1567 #ifdef CONFIG_VNC_JPEG
1568 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) {
1569 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette,
1570 force_jpeg);
1571 } else {
1572 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1573 }
1574 #else
1575 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1576 #endif
1577
1578 palette_destroy(palette);
1579 return ret;
1580 }
1581
1582 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1583 {
1584 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1585
1586 vnc_tight_start(vs);
1587 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1588 vnc_tight_stop(vs);
1589
1590 return send_solid_rect(vs);
1591 }
1592
1593 static int send_rect_simple(VncState *vs, int x, int y, int w, int h,
1594 bool split)
1595 {
1596 int max_size, max_width;
1597 int max_sub_width, max_sub_height;
1598 int dx, dy;
1599 int rw, rh;
1600 int n = 0;
1601
1602 max_size = tight_conf[vs->tight.compression].max_rect_size;
1603 max_width = tight_conf[vs->tight.compression].max_rect_width;
1604
1605 if (split && (w > max_width || w * h > max_size)) {
1606 max_sub_width = (w > max_width) ? max_width : w;
1607 max_sub_height = max_size / max_sub_width;
1608
1609 for (dy = 0; dy < h; dy += max_sub_height) {
1610 for (dx = 0; dx < w; dx += max_width) {
1611 rw = MIN(max_sub_width, w - dx);
1612 rh = MIN(max_sub_height, h - dy);
1613 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1614 }
1615 }
1616 } else {
1617 n += send_sub_rect(vs, x, y, w, h);
1618 }
1619
1620 return n;
1621 }
1622
1623 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1624 int w, int h, int max_rows)
1625 {
1626 int dx, dy, dw, dh;
1627 int n = 0;
1628
1629 /* Try to find large solid-color areas and send them separately. */
1630
1631 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1632
1633 /* If a rectangle becomes too large, send its upper part now. */
1634
1635 if (dy - y >= max_rows) {
1636 n += send_rect_simple(vs, x, y, w, max_rows, true);
1637 y += max_rows;
1638 h -= max_rows;
1639 }
1640
1641 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1642
1643 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1644 uint32_t color_value;
1645 int x_best, y_best, w_best, h_best;
1646
1647 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1648
1649 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1650 continue ;
1651 }
1652
1653 /* Get dimensions of solid-color area. */
1654
1655 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1656 color_value, &w_best, &h_best);
1657
1658 /* Make sure a solid rectangle is large enough
1659 (or the whole rectangle is of the same color). */
1660
1661 if (w_best * h_best != w * h &&
1662 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1663 continue;
1664 }
1665
1666 /* Try to extend solid rectangle to maximum size. */
1667
1668 x_best = dx; y_best = dy;
1669 extend_solid_area(vs, x, y, w, h, color_value,
1670 &x_best, &y_best, &w_best, &h_best);
1671
1672 /* Send rectangles at top and left to solid-color area. */
1673
1674 if (y_best != y) {
1675 n += send_rect_simple(vs, x, y, w, y_best-y, true);
1676 }
1677 if (x_best != x) {
1678 n += tight_send_framebuffer_update(vs, x, y_best,
1679 x_best-x, h_best);
1680 }
1681
1682 /* Send solid-color rectangle. */
1683 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1684
1685 /* Send remaining rectangles (at right and bottom). */
1686
1687 if (x_best + w_best != x + w) {
1688 n += tight_send_framebuffer_update(vs, x_best+w_best,
1689 y_best,
1690 w-(x_best-x)-w_best,
1691 h_best);
1692 }
1693 if (y_best + h_best != y + h) {
1694 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1695 w, h-(y_best-y)-h_best);
1696 }
1697
1698 /* Return after all recursive calls are done. */
1699 return n;
1700 }
1701 }
1702 return n + send_rect_simple(vs, x, y, w, h, true);
1703 }
1704
1705 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1706 int w, int h)
1707 {
1708 int max_rows;
1709
1710 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
1711 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
1712 vs->tight.pixel24 = true;
1713 } else {
1714 vs->tight.pixel24 = false;
1715 }
1716
1717 #ifdef CONFIG_VNC_JPEG
1718 if (vs->tight.quality != (uint8_t)-1) {
1719 double freq = vnc_update_freq(vs, x, y, w, h);
1720
1721 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1722 return send_rect_simple(vs, x, y, w, h, false);
1723 }
1724 }
1725 #endif
1726
1727 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1728 return send_rect_simple(vs, x, y, w, h, true);
1729 }
1730
1731 /* Calculate maximum number of rows in one non-solid rectangle. */
1732
1733 max_rows = tight_conf[vs->tight.compression].max_rect_size;
1734 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1735
1736 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1737 }
1738
1739 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1740 int w, int h)
1741 {
1742 vs->tight.type = VNC_ENCODING_TIGHT;
1743 return tight_send_framebuffer_update(vs, x, y, w, h);
1744 }
1745
1746 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1747 int w, int h)
1748 {
1749 vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1750 return tight_send_framebuffer_update(vs, x, y, w, h);
1751 }
1752
1753 void vnc_tight_clear(VncState *vs)
1754 {
1755 int i;
1756 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1757 if (vs->tight.stream[i].opaque) {
1758 deflateEnd(&vs->tight.stream[i]);
1759 }
1760 }
1761
1762 buffer_free(&vs->tight.tight);
1763 buffer_free(&vs->tight.zlib);
1764 buffer_free(&vs->tight.gradient);
1765 #ifdef CONFIG_VNC_JPEG
1766 buffer_free(&vs->tight.jpeg);
1767 #endif
1768 #ifdef CONFIG_VNC_PNG
1769 buffer_free(&vs->tight.png);
1770 #endif
1771 }
QEmu