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Fix uint8_t comparison with negative value
[qemu/lumag.git] / ui / vnc-enc-tight.c
blob6f046f86c536a544cb62d23c5341698974715787
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_PNG
76 static const struct {
77 int png_zlib_level, png_filters;
78 } tight_png_conf[] = {
79 { 0, PNG_NO_FILTERS },
80 { 1, PNG_NO_FILTERS },
81 { 2, PNG_NO_FILTERS },
82 { 3, PNG_NO_FILTERS },
83 { 4, PNG_NO_FILTERS },
84 { 5, PNG_ALL_FILTERS },
85 { 6, PNG_ALL_FILTERS },
86 { 7, PNG_ALL_FILTERS },
87 { 8, PNG_ALL_FILTERS },
88 { 9, PNG_ALL_FILTERS },
89 };
90
91 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
92 VncPalette *palette);
93
94 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
95 {
96 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
97 return false;
98 }
99
100 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
101 vs->clientds.pf.bytes_per_pixel == 1) {
102 return false;
103 }
104
105 return true;
106 }
107 #endif
108
109 /*
110 * Code to guess if given rectangle is suitable for smooth image
111 * compression (by applying "gradient" filter or JPEG coder).
112 */
113
114 static unsigned int
115 tight_detect_smooth_image24(VncState *vs, int w, int h)
116 {
117 int off;
118 int x, y, d, dx;
119 unsigned int c;
120 unsigned int stats[256];
121 int pixels = 0;
122 int pix, left[3];
123 unsigned int errors;
124 unsigned char *buf = vs->tight.tight.buffer;
125
126 /*
127 * If client is big-endian, color samples begin from the second
128 * byte (offset 1) of a 32-bit pixel value.
129 */
130 off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG);
131
132 memset(stats, 0, sizeof (stats));
133
134 for (y = 0, x = 0; y < h && x < w;) {
135 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
136 d++) {
137 for (c = 0; c < 3; c++) {
138 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
139 }
140 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
141 for (c = 0; c < 3; c++) {
142 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
143 stats[abs(pix - left[c])]++;
144 left[c] = pix;
145 }
146 pixels++;
147 }
148 }
149 if (w > h) {
150 x += h;
151 y = 0;
152 } else {
153 x = 0;
154 y += w;
155 }
156 }
157
158 /* 95% smooth or more ... */
159 if (stats[0] * 33 / pixels >= 95) {
160 return 0;
161 }
162
163 errors = 0;
164 for (c = 1; c < 8; c++) {
165 errors += stats[c] * (c * c);
166 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
167 return 0;
168 }
169 }
170 for (; c < 256; c++) {
171 errors += stats[c] * (c * c);
172 }
173 errors /= (pixels * 3 - stats[0]);
174
175 return errors;
176 }
177
178 #define DEFINE_DETECT_FUNCTION(bpp) \
179 \
180 static unsigned int \
181 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
182 bool endian; \
183 uint##bpp##_t pix; \
184 int max[3], shift[3]; \
185 int x, y, d, dx; \
186 unsigned int c; \
187 unsigned int stats[256]; \
188 int pixels = 0; \
189 int sample, sum, left[3]; \
190 unsigned int errors; \
191 unsigned char *buf = vs->tight.tight.buffer; \
192 \
193 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
194 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
195 \
196 \
197 max[0] = vs->clientds.pf.rmax; \
198 max[1] = vs->clientds.pf.gmax; \
199 max[2] = vs->clientds.pf.bmax; \
200 shift[0] = vs->clientds.pf.rshift; \
201 shift[1] = vs->clientds.pf.gshift; \
202 shift[2] = vs->clientds.pf.bshift; \
203 \
204 memset(stats, 0, sizeof(stats)); \
205 \
206 y = 0, x = 0; \
207 while (y < h && x < w) { \
208 for (d = 0; d < h - y && \
209 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
210 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
211 if (endian) { \
212 pix = bswap_##bpp(pix); \
213 } \
214 for (c = 0; c < 3; c++) { \
215 left[c] = (int)(pix >> shift[c] & max[c]); \
216 } \
217 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
218 dx++) { \
219 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
220 if (endian) { \
221 pix = bswap_##bpp(pix); \
222 } \
223 sum = 0; \
224 for (c = 0; c < 3; c++) { \
225 sample = (int)(pix >> shift[c] & max[c]); \
226 sum += abs(sample - left[c]); \
227 left[c] = sample; \
228 } \
229 if (sum > 255) { \
230 sum = 255; \
231 } \
232 stats[sum]++; \
233 pixels++; \
234 } \
235 } \
236 if (w > h) { \
237 x += h; \
238 y = 0; \
239 } else { \
240 x = 0; \
241 y += w; \
242 } \
243 } \
244 \
245 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
246 return 0; \
247 } \
248 \
249 errors = 0; \
250 for (c = 1; c < 8; c++) { \
251 errors += stats[c] * (c * c); \
252 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
253 return 0; \
254 } \
255 } \
256 for (; c < 256; c++) { \
257 errors += stats[c] * (c * c); \
258 } \
259 errors /= (pixels - stats[0]); \
260 \
261 return errors; \
262 }
263
264 DEFINE_DETECT_FUNCTION(16)
265 DEFINE_DETECT_FUNCTION(32)
266
267 static int
268 tight_detect_smooth_image(VncState *vs, int w, int h)
269 {
270 unsigned int errors;
271 int compression = vs->tight.compression;
272 int quality = vs->tight.quality;
273
274 if (!vs->vd->lossy) {
275 return 0;
276 }
277
278 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
279 vs->clientds.pf.bytes_per_pixel == 1 ||
280 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
281 return 0;
282 }
283
284 if (vs->tight.quality != (uint8_t)-1) {
285 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
286 return 0;
287 }
288 } else {
289 if (w * h < tight_conf[compression].gradient_min_rect_size) {
290 return 0;
291 }
292 }
293
294 if (vs->clientds.pf.bytes_per_pixel == 4) {
295 if (vs->tight.pixel24) {
296 errors = tight_detect_smooth_image24(vs, w, h);
297 if (vs->tight.quality != (uint8_t)-1) {
298 return (errors < tight_conf[quality].jpeg_threshold24);
299 }
300 return (errors < tight_conf[compression].gradient_threshold24);
301 } else {
302 errors = tight_detect_smooth_image32(vs, w, h);
303 }
304 } else {
305 errors = tight_detect_smooth_image16(vs, w, h);
306 }
307 if (quality != -1) {
308 return (errors < tight_conf[quality].jpeg_threshold);
309 }
310 return (errors < tight_conf[compression].gradient_threshold);
311 }
312
313 /*
314 * Code to determine how many different colors used in rectangle.
315 */
316 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
317 \
318 static int \
319 tight_fill_palette##bpp(VncState *vs, int x, int y, \
320 int max, size_t count, \
321 uint32_t *bg, uint32_t *fg, \
322 VncPalette **palette) { \
323 uint##bpp##_t *data; \
324 uint##bpp##_t c0, c1, ci; \
325 int i, n0, n1; \
326 \
327 data = (uint##bpp##_t *)vs->tight.tight.buffer; \
328 \
329 c0 = data[0]; \
330 i = 1; \
331 while (i < count && data[i] == c0) \
332 i++; \
333 if (i >= count) { \
334 *bg = *fg = c0; \
335 return 1; \
336 } \
337 \
338 if (max < 2) { \
339 return 0; \
340 } \
341 \
342 n0 = i; \
343 c1 = data[i]; \
344 n1 = 0; \
345 for (i++; i < count; i++) { \
346 ci = data[i]; \
347 if (ci == c0) { \
348 n0++; \
349 } else if (ci == c1) { \
350 n1++; \
351 } else \
352 break; \
353 } \
354 if (i >= count) { \
355 if (n0 > n1) { \
356 *bg = (uint32_t)c0; \
357 *fg = (uint32_t)c1; \
358 } else { \
359 *bg = (uint32_t)c1; \
360 *fg = (uint32_t)c0; \
361 } \
362 return 2; \
363 } \
364 \
365 if (max == 2) { \
366 return 0; \
367 } \
368 \
369 *palette = palette_new(max, bpp); \
370 palette_put(*palette, c0); \
371 palette_put(*palette, c1); \
372 palette_put(*palette, ci); \
373 \
374 for (i++; i < count; i++) { \
375 if (data[i] == ci) { \
376 continue; \
377 } else { \
378 ci = data[i]; \
379 if (!palette_put(*palette, (uint32_t)ci)) { \
380 return 0; \
381 } \
382 } \
383 } \
384 \
385 return palette_size(*palette); \
386 }
387
388 DEFINE_FILL_PALETTE_FUNCTION(8)
389 DEFINE_FILL_PALETTE_FUNCTION(16)
390 DEFINE_FILL_PALETTE_FUNCTION(32)
391
392 static int tight_fill_palette(VncState *vs, int x, int y,
393 size_t count, uint32_t *bg, uint32_t *fg,
394 VncPalette **palette)
395 {
396 int max;
397
398 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
399 if (max < 2 &&
400 count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
401 max = 2;
402 }
403 if (max >= 256) {
404 max = 256;
405 }
406
407 switch(vs->clientds.pf.bytes_per_pixel) {
408 case 4:
409 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
410 case 2:
411 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
412 default:
413 max = 2;
414 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
415 }
416 return 0;
417 }
418
419 /*
420 * Converting truecolor samples into palette indices.
421 */
422 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
423 \
424 static void \
425 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
426 VncPalette *palette) { \
427 uint##bpp##_t *src; \
428 uint##bpp##_t rgb; \
429 int i, rep; \
430 uint8_t idx; \
431 \
432 src = (uint##bpp##_t *) buf; \
433 \
434 for (i = 0; i < count; i++) { \
435 \
436 rgb = *src++; \
437 rep = 0; \
438 while (i < count && *src == rgb) { \
439 rep++, src++, i++; \
440 } \
441 idx = palette_idx(palette, rgb); \
442 /* \
443 * Should never happen, but don't break everything \
444 * if it does, use the first color instead \
445 */ \
446 if (idx == (uint8_t)-1) { \
447 idx = 0; \
448 } \
449 while (rep >= 0) { \
450 *buf++ = idx; \
451 rep--; \
452 } \
453 } \
454 }
455
456 DEFINE_IDX_ENCODE_FUNCTION(16)
457 DEFINE_IDX_ENCODE_FUNCTION(32)
458
459 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
460 \
461 static void \
462 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
463 uint##bpp##_t bg, uint##bpp##_t fg) { \
464 uint##bpp##_t *ptr; \
465 unsigned int value, mask; \
466 int aligned_width; \
467 int x, y, bg_bits; \
468 \
469 ptr = (uint##bpp##_t *) buf; \
470 aligned_width = w - w % 8; \
471 \
472 for (y = 0; y < h; y++) { \
473 for (x = 0; x < aligned_width; x += 8) { \
474 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
475 if (*ptr++ != bg) { \
476 break; \
477 } \
478 } \
479 if (bg_bits == 8) { \
480 *buf++ = 0; \
481 continue; \
482 } \
483 mask = 0x80 >> bg_bits; \
484 value = mask; \
485 for (bg_bits++; bg_bits < 8; bg_bits++) { \
486 mask >>= 1; \
487 if (*ptr++ != bg) { \
488 value |= mask; \
489 } \
490 } \
491 *buf++ = (uint8_t)value; \
492 } \
493 \
494 mask = 0x80; \
495 value = 0; \
496 if (x >= w) { \
497 continue; \
498 } \
499 \
500 for (; x < w; x++) { \
501 if (*ptr++ != bg) { \
502 value |= mask; \
503 } \
504 mask >>= 1; \
505 } \
506 *buf++ = (uint8_t)value; \
507 } \
508 }
509
510 DEFINE_MONO_ENCODE_FUNCTION(8)
511 DEFINE_MONO_ENCODE_FUNCTION(16)
512 DEFINE_MONO_ENCODE_FUNCTION(32)
513
514 /*
515 * ``Gradient'' filter for 24-bit color samples.
516 * Should be called only when redMax, greenMax and blueMax are 255.
517 * Color components assumed to be byte-aligned.
518 */
519
520 static void
521 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
522 {
523 uint32_t *buf32;
524 uint32_t pix32;
525 int shift[3];
526 int *prev;
527 int here[3], upper[3], left[3], upperleft[3];
528 int prediction;
529 int x, y, c;
530
531 buf32 = (uint32_t *)buf;
532 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));
533
534 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
535 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
536 shift[0] = vs->clientds.pf.rshift;
537 shift[1] = vs->clientds.pf.gshift;
538 shift[2] = vs->clientds.pf.bshift;
539 } else {
540 shift[0] = 24 - vs->clientds.pf.rshift;
541 shift[1] = 24 - vs->clientds.pf.gshift;
542 shift[2] = 24 - vs->clientds.pf.bshift;
543 }
544
545 for (y = 0; y < h; y++) {
546 for (c = 0; c < 3; c++) {
547 upper[c] = 0;
548 here[c] = 0;
549 }
550 prev = (int *)vs->tight.gradient.buffer;
551 for (x = 0; x < w; x++) {
552 pix32 = *buf32++;
553 for (c = 0; c < 3; c++) {
554 upperleft[c] = upper[c];
555 left[c] = here[c];
556 upper[c] = *prev;
557 here[c] = (int)(pix32 >> shift[c] & 0xFF);
558 *prev++ = here[c];
559
560 prediction = left[c] + upper[c] - upperleft[c];
561 if (prediction < 0) {
562 prediction = 0;
563 } else if (prediction > 0xFF) {
564 prediction = 0xFF;
565 }
566 *buf++ = (char)(here[c] - prediction);
567 }
568 }
569 }
570 }
571
572
573 /*
574 * ``Gradient'' filter for other color depths.
575 */
576
577 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
578 \
579 static void \
580 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
581 int w, int h) { \
582 uint##bpp##_t pix, diff; \
583 bool endian; \
584 int *prev; \
585 int max[3], shift[3]; \
586 int here[3], upper[3], left[3], upperleft[3]; \
587 int prediction; \
588 int x, y, c; \
589 \
590 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \
591 \
592 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
593 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
594 \
595 max[0] = vs->clientds.pf.rmax; \
596 max[1] = vs->clientds.pf.gmax; \
597 max[2] = vs->clientds.pf.bmax; \
598 shift[0] = vs->clientds.pf.rshift; \
599 shift[1] = vs->clientds.pf.gshift; \
600 shift[2] = vs->clientds.pf.bshift; \
601 \
602 for (y = 0; y < h; y++) { \
603 for (c = 0; c < 3; c++) { \
604 upper[c] = 0; \
605 here[c] = 0; \
606 } \
607 prev = (int *)vs->tight.gradient.buffer; \
608 for (x = 0; x < w; x++) { \
609 pix = *buf; \
610 if (endian) { \
611 pix = bswap_##bpp(pix); \
612 } \
613 diff = 0; \
614 for (c = 0; c < 3; c++) { \
615 upperleft[c] = upper[c]; \
616 left[c] = here[c]; \
617 upper[c] = *prev; \
618 here[c] = (int)(pix >> shift[c] & max[c]); \
619 *prev++ = here[c]; \
620 \
621 prediction = left[c] + upper[c] - upperleft[c]; \
622 if (prediction < 0) { \
623 prediction = 0; \
624 } else if (prediction > max[c]) { \
625 prediction = max[c]; \
626 } \
627 diff |= ((here[c] - prediction) & max[c]) \
628 << shift[c]; \
629 } \
630 if (endian) { \
631 diff = bswap_##bpp(diff); \
632 } \
633 *buf++ = diff; \
634 } \
635 } \
636 }
637
638 DEFINE_GRADIENT_FILTER_FUNCTION(16)
639 DEFINE_GRADIENT_FILTER_FUNCTION(32)
640
641 /*
642 * Check if a rectangle is all of the same color. If needSameColor is
643 * set to non-zero, then also check that its color equals to the
644 * *colorPtr value. The result is 1 if the test is successfull, and in
645 * that case new color will be stored in *colorPtr.
646 */
647
648 #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
649 \
650 static bool \
651 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \
652 uint32_t* color, bool samecolor) \
653 { \
654 VncDisplay *vd = vs->vd; \
655 uint##bpp##_t *fbptr; \
656 uint##bpp##_t c; \
657 int dx, dy; \
658 \
659 fbptr = (uint##bpp##_t *) \
660 (vd->server->data + y * ds_get_linesize(vs->ds) + \
661 x * ds_get_bytes_per_pixel(vs->ds)); \
662 \
663 c = *fbptr; \
664 if (samecolor && (uint32_t)c != *color) { \
665 return false; \
666 } \
667 \
668 for (dy = 0; dy < h; dy++) { \
669 for (dx = 0; dx < w; dx++) { \
670 if (c != fbptr[dx]) { \
671 return false; \
672 } \
673 } \
674 fbptr = (uint##bpp##_t *) \
675 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \
676 } \
677 \
678 *color = (uint32_t)c; \
679 return true; \
680 }
681
682 DEFINE_CHECK_SOLID_FUNCTION(32)
683 DEFINE_CHECK_SOLID_FUNCTION(16)
684 DEFINE_CHECK_SOLID_FUNCTION(8)
685
686 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
687 uint32_t* color, bool samecolor)
688 {
689 VncDisplay *vd = vs->vd;
690
691 switch(vd->server->pf.bytes_per_pixel) {
692 case 4:
693 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
694 case 2:
695 return check_solid_tile16(vs, x, y, w, h, color, samecolor);
696 default:
697 return check_solid_tile8(vs, x, y, w, h, color, samecolor);
698 }
699 }
700
701 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
702 uint32_t color, int *w_ptr, int *h_ptr)
703 {
704 int dx, dy, dw, dh;
705 int w_prev;
706 int w_best = 0, h_best = 0;
707
708 w_prev = w;
709
710 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
711
712 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
713 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
714
715 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
716 break;
717 }
718
719 for (dx = x + dw; dx < x + w_prev;) {
720 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
721
722 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
723 break;
724 }
725 dx += dw;
726 }
727
728 w_prev = dx - x;
729 if (w_prev * (dy + dh - y) > w_best * h_best) {
730 w_best = w_prev;
731 h_best = dy + dh - y;
732 }
733 }
734
735 *w_ptr = w_best;
736 *h_ptr = h_best;
737 }
738
739 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
740 uint32_t color, int *x_ptr, int *y_ptr,
741 int *w_ptr, int *h_ptr)
742 {
743 int cx, cy;
744
745 /* Try to extend the area upwards. */
746 for ( cy = *y_ptr - 1;
747 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
748 cy-- );
749 *h_ptr += *y_ptr - (cy + 1);
750 *y_ptr = cy + 1;
751
752 /* ... downwards. */
753 for ( cy = *y_ptr + *h_ptr;
754 cy < y + h &&
755 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
756 cy++ );
757 *h_ptr += cy - (*y_ptr + *h_ptr);
758
759 /* ... to the left. */
760 for ( cx = *x_ptr - 1;
761 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
762 cx-- );
763 *w_ptr += *x_ptr - (cx + 1);
764 *x_ptr = cx + 1;
765
766 /* ... to the right. */
767 for ( cx = *x_ptr + *w_ptr;
768 cx < x + w &&
769 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
770 cx++ );
771 *w_ptr += cx - (*x_ptr + *w_ptr);
772 }
773
774 static int tight_init_stream(VncState *vs, int stream_id,
775 int level, int strategy)
776 {
777 z_streamp zstream = &vs->tight.stream[stream_id];
778
779 if (zstream->opaque == NULL) {
780 int err;
781
782 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
783 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
784 zstream->zalloc = vnc_zlib_zalloc;
785 zstream->zfree = vnc_zlib_zfree;
786
787 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
788 MAX_MEM_LEVEL, strategy);
789
790 if (err != Z_OK) {
791 fprintf(stderr, "VNC: error initializing zlib\n");
792 return -1;
793 }
794
795 vs->tight.levels[stream_id] = level;
796 zstream->opaque = vs;
797 }
798
799 if (vs->tight.levels[stream_id] != level) {
800 if (deflateParams(zstream, level, strategy) != Z_OK) {
801 return -1;
802 }
803 vs->tight.levels[stream_id] = level;
804 }
805 return 0;
806 }
807
808 static void tight_send_compact_size(VncState *vs, size_t len)
809 {
810 int lpc = 0;
811 int bytes = 0;
812 char buf[3] = {0, 0, 0};
813
814 buf[bytes++] = len & 0x7F;
815 if (len > 0x7F) {
816 buf[bytes-1] |= 0x80;
817 buf[bytes++] = (len >> 7) & 0x7F;
818 if (len > 0x3FFF) {
819 buf[bytes-1] |= 0x80;
820 buf[bytes++] = (len >> 14) & 0xFF;
821 }
822 }
823 for (lpc = 0; lpc < bytes; lpc++) {
824 vnc_write_u8(vs, buf[lpc]);
825 }
826 }
827
828 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
829 int level, int strategy)
830 {
831 z_streamp zstream = &vs->tight.stream[stream_id];
832 int previous_out;
833
834 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
835 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
836 return bytes;
837 }
838
839 if (tight_init_stream(vs, stream_id, level, strategy)) {
840 return -1;
841 }
842
843 /* reserve memory in output buffer */
844 buffer_reserve(&vs->tight.zlib, bytes + 64);
845
846 /* set pointers */
847 zstream->next_in = vs->tight.tight.buffer;
848 zstream->avail_in = vs->tight.tight.offset;
849 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
850 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
851 zstream->data_type = Z_BINARY;
852 previous_out = zstream->total_out;
853
854 /* start encoding */
855 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
856 fprintf(stderr, "VNC: error during tight compression\n");
857 return -1;
858 }
859
860 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
861 bytes = zstream->total_out - previous_out;
862
863 tight_send_compact_size(vs, bytes);
864 vnc_write(vs, vs->tight.zlib.buffer, bytes);
865
866 buffer_reset(&vs->tight.zlib);
867
868 return bytes;
869 }
870
871 /*
872 * Subencoding implementations.
873 */
874 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
875 {
876 uint32_t *buf32;
877 uint32_t pix;
878 int rshift, gshift, bshift;
879
880 buf32 = (uint32_t *)buf;
881
882 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
883 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
884 rshift = vs->clientds.pf.rshift;
885 gshift = vs->clientds.pf.gshift;
886 bshift = vs->clientds.pf.bshift;
887 } else {
888 rshift = 24 - vs->clientds.pf.rshift;
889 gshift = 24 - vs->clientds.pf.gshift;
890 bshift = 24 - vs->clientds.pf.bshift;
891 }
892
893 if (ret) {
894 *ret = count * 3;
895 }
896
897 while (count--) {
898 pix = *buf32++;
899 *buf++ = (char)(pix >> rshift);
900 *buf++ = (char)(pix >> gshift);
901 *buf++ = (char)(pix >> bshift);
902 }
903 }
904
905 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
906 {
907 int stream = 0;
908 size_t bytes;
909
910 #ifdef CONFIG_VNC_PNG
911 if (tight_can_send_png_rect(vs, w, h)) {
912 return send_png_rect(vs, x, y, w, h, NULL);
913 }
914 #endif
915
916 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
917
918 if (vs->tight.pixel24) {
919 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset);
920 bytes = 3;
921 } else {
922 bytes = vs->clientds.pf.bytes_per_pixel;
923 }
924
925 bytes = tight_compress_data(vs, stream, w * h * bytes,
926 tight_conf[vs->tight.compression].raw_zlib_level,
927 Z_DEFAULT_STRATEGY);
928
929 return (bytes >= 0);
930 }
931
932 static int send_solid_rect(VncState *vs)
933 {
934 size_t bytes;
935
936 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
937
938 if (vs->tight.pixel24) {
939 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset);
940 bytes = 3;
941 } else {
942 bytes = vs->clientds.pf.bytes_per_pixel;
943 }
944
945 vnc_write(vs, vs->tight.tight.buffer, bytes);
946 return 1;
947 }
948
949 static int send_mono_rect(VncState *vs, int x, int y,
950 int w, int h, uint32_t bg, uint32_t fg)
951 {
952 size_t bytes;
953 int stream = 1;
954 int level = tight_conf[vs->tight.compression].mono_zlib_level;
955
956 #ifdef CONFIG_VNC_PNG
957 if (tight_can_send_png_rect(vs, w, h)) {
958 int ret;
959 int bpp = vs->clientds.pf.bytes_per_pixel * 8;
960 VncPalette *palette = palette_new(2, bpp);
961
962 palette_put(palette, bg);
963 palette_put(palette, fg);
964 ret = send_png_rect(vs, x, y, w, h, palette);
965 palette_destroy(palette);
966 return ret;
967 }
968 #endif
969
970 bytes = ((w + 7) / 8) * h;
971
972 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
973 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
974 vnc_write_u8(vs, 1);
975
976 switch(vs->clientds.pf.bytes_per_pixel) {
977 case 4:
978 {
979 uint32_t buf[2] = {bg, fg};
980 size_t ret = sizeof (buf);
981
982 if (vs->tight.pixel24) {
983 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
984 }
985 vnc_write(vs, buf, ret);
986
987 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg);
988 break;
989 }
990 case 2:
991 vnc_write(vs, &bg, 2);
992 vnc_write(vs, &fg, 2);
993 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg);
994 break;
995 default:
996 vnc_write_u8(vs, bg);
997 vnc_write_u8(vs, fg);
998 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg);
999 break;
1000 }
1001 vs->tight.tight.offset = bytes;
1002
1003 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1004 return (bytes >= 0);
1005 }
1006
1007 struct palette_cb_priv {
1008 VncState *vs;
1009 uint8_t *header;
1010 #ifdef CONFIG_VNC_PNG
1011 png_colorp png_palette;
1012 #endif
1013 };
1014
1015 static void write_palette(int idx, uint32_t color, void *opaque)
1016 {
1017 struct palette_cb_priv *priv = opaque;
1018 VncState *vs = priv->vs;
1019 uint32_t bytes = vs->clientds.pf.bytes_per_pixel;
1020
1021 if (bytes == 4) {
1022 ((uint32_t*)priv->header)[idx] = color;
1023 } else {
1024 ((uint16_t*)priv->header)[idx] = color;
1025 }
1026 }
1027
1028 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h)
1029 {
1030 int stream = 3;
1031 int level = tight_conf[vs->tight.compression].gradient_zlib_level;
1032 size_t bytes;
1033
1034 if (vs->clientds.pf.bytes_per_pixel == 1)
1035 return send_full_color_rect(vs, x, y, w, h);
1036
1037 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1038 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1039
1040 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int));
1041
1042 if (vs->tight.pixel24) {
1043 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h);
1044 bytes = 3;
1045 } else if (vs->clientds.pf.bytes_per_pixel == 4) {
1046 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h);
1047 bytes = 4;
1048 } else {
1049 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h);
1050 bytes = 2;
1051 }
1052
1053 buffer_reset(&vs->tight.gradient);
1054
1055 bytes = w * h * bytes;
1056 vs->tight.tight.offset = bytes;
1057
1058 bytes = tight_compress_data(vs, stream, bytes,
1059 level, Z_FILTERED);
1060 return (bytes >= 0);
1061 }
1062
1063 static int send_palette_rect(VncState *vs, int x, int y,
1064 int w, int h, VncPalette *palette)
1065 {
1066 int stream = 2;
1067 int level = tight_conf[vs->tight.compression].idx_zlib_level;
1068 int colors;
1069 size_t bytes;
1070
1071 #ifdef CONFIG_VNC_PNG
1072 if (tight_can_send_png_rect(vs, w, h)) {
1073 return send_png_rect(vs, x, y, w, h, palette);
1074 }
1075 #endif
1076
1077 colors = palette_size(palette);
1078
1079 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1080 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1081 vnc_write_u8(vs, colors - 1);
1082
1083 switch(vs->clientds.pf.bytes_per_pixel) {
1084 case 4:
1085 {
1086 size_t old_offset, offset;
1087 uint32_t header[palette_size(palette)];
1088 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1089
1090 old_offset = vs->output.offset;
1091 palette_iter(palette, write_palette, &priv);
1092 vnc_write(vs, header, sizeof(header));
1093
1094 if (vs->tight.pixel24) {
1095 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1096 vs->output.offset = old_offset + offset;
1097 }
1098
1099 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1100 break;
1101 }
1102 case 2:
1103 {
1104 uint16_t header[palette_size(palette)];
1105 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1106
1107 palette_iter(palette, write_palette, &priv);
1108 vnc_write(vs, header, sizeof(header));
1109 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1110 break;
1111 }
1112 default:
1113 return -1; /* No palette for 8bits colors */
1114 break;
1115 }
1116 bytes = w * h;
1117 vs->tight.tight.offset = bytes;
1118
1119 bytes = tight_compress_data(vs, stream, bytes,
1120 level, Z_DEFAULT_STRATEGY);
1121 return (bytes >= 0);
1122 }
1123
1124 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG)
1125 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y,
1126 int count)
1127 {
1128 VncDisplay *vd = vs->vd;
1129 uint32_t *fbptr;
1130 uint32_t pix;
1131
1132 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) +
1133 x * ds_get_bytes_per_pixel(vs->ds));
1134
1135 while (count--) {
1136 pix = *fbptr++;
1137 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift);
1138 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift);
1139 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift);
1140 }
1141 }
1142
1143 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp) \
1144 \
1145 static void \
1146 rgb_prepare_row##bpp(VncState *vs, uint8_t *dst, \
1147 int x, int y, int count) \
1148 { \
1149 VncDisplay *vd = vs->vd; \
1150 uint##bpp##_t *fbptr; \
1151 uint##bpp##_t pix; \
1152 int r, g, b; \
1153 \
1154 fbptr = (uint##bpp##_t *) \
1155 (vd->server->data + y * ds_get_linesize(vs->ds) + \
1156 x * ds_get_bytes_per_pixel(vs->ds)); \
1157 \
1158 while (count--) { \
1159 pix = *fbptr++; \
1160 \
1161 r = (int)((pix >> vs->ds->surface->pf.rshift) \
1162 & vs->ds->surface->pf.rmax); \
1163 g = (int)((pix >> vs->ds->surface->pf.gshift) \
1164 & vs->ds->surface->pf.gmax); \
1165 b = (int)((pix >> vs->ds->surface->pf.bshift) \
1166 & vs->ds->surface->pf.bmax); \
1167 \
1168 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \
1169 / vs->ds->surface->pf.rmax); \
1170 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \
1171 / vs->ds->surface->pf.gmax); \
1172 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \
1173 / vs->ds->surface->pf.bmax); \
1174 } \
1175 }
1176
1177 DEFINE_RGB_GET_ROW_FUNCTION(16)
1178 DEFINE_RGB_GET_ROW_FUNCTION(32)
1179
1180 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y,
1181 int count)
1182 {
1183 if (ds_get_bytes_per_pixel(vs->ds) == 4) {
1184 if (vs->ds->surface->pf.rmax == 0xFF &&
1185 vs->ds->surface->pf.gmax == 0xFF &&
1186 vs->ds->surface->pf.bmax == 0xFF) {
1187 rgb_prepare_row24(vs, dst, x, y, count);
1188 } else {
1189 rgb_prepare_row32(vs, dst, x, y, count);
1190 }
1191 } else {
1192 rgb_prepare_row16(vs, dst, x, y, count);
1193 }
1194 }
1195 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */
1196
1197 /*
1198 * JPEG compression stuff.
1199 */
1200 #ifdef CONFIG_VNC_JPEG
1201 /*
1202 * Destination manager implementation for JPEG library.
1203 */
1204
1205 /* This is called once per encoding */
1206 static void jpeg_init_destination(j_compress_ptr cinfo)
1207 {
1208 VncState *vs = cinfo->client_data;
1209 Buffer *buffer = &vs->tight.jpeg;
1210
1211 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1212 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1213 }
1214
1215 /* This is called when we ran out of buffer (shouldn't happen!) */
1216 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1217 {
1218 VncState *vs = cinfo->client_data;
1219 Buffer *buffer = &vs->tight.jpeg;
1220
1221 buffer->offset = buffer->capacity;
1222 buffer_reserve(buffer, 2048);
1223 jpeg_init_destination(cinfo);
1224 return TRUE;
1225 }
1226
1227 /* This is called when we are done processing data */
1228 static void jpeg_term_destination(j_compress_ptr cinfo)
1229 {
1230 VncState *vs = cinfo->client_data;
1231 Buffer *buffer = &vs->tight.jpeg;
1232
1233 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1234 }
1235
1236 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1237 {
1238 struct jpeg_compress_struct cinfo;
1239 struct jpeg_error_mgr jerr;
1240 struct jpeg_destination_mgr manager;
1241 JSAMPROW row[1];
1242 uint8_t *buf;
1243 int dy;
1244
1245 if (ds_get_bytes_per_pixel(vs->ds) == 1)
1246 return send_full_color_rect(vs, x, y, w, h);
1247
1248 buffer_reserve(&vs->tight.jpeg, 2048);
1249
1250 cinfo.err = jpeg_std_error(&jerr);
1251 jpeg_create_compress(&cinfo);
1252
1253 cinfo.client_data = vs;
1254 cinfo.image_width = w;
1255 cinfo.image_height = h;
1256 cinfo.input_components = 3;
1257 cinfo.in_color_space = JCS_RGB;
1258
1259 jpeg_set_defaults(&cinfo);
1260 jpeg_set_quality(&cinfo, quality, true);
1261
1262 manager.init_destination = jpeg_init_destination;
1263 manager.empty_output_buffer = jpeg_empty_output_buffer;
1264 manager.term_destination = jpeg_term_destination;
1265 cinfo.dest = &manager;
1266
1267 jpeg_start_compress(&cinfo, true);
1268
1269 buf = qemu_malloc(w * 3);
1270 row[0] = buf;
1271 for (dy = 0; dy < h; dy++) {
1272 rgb_prepare_row(vs, buf, x, y + dy, w);
1273 jpeg_write_scanlines(&cinfo, row, 1);
1274 }
1275 qemu_free(buf);
1276
1277 jpeg_finish_compress(&cinfo);
1278 jpeg_destroy_compress(&cinfo);
1279
1280 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1281
1282 tight_send_compact_size(vs, vs->tight.jpeg.offset);
1283 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset);
1284 buffer_reset(&vs->tight.jpeg);
1285
1286 return 1;
1287 }
1288 #endif /* CONFIG_VNC_JPEG */
1289
1290 /*
1291 * PNG compression stuff.
1292 */
1293 #ifdef CONFIG_VNC_PNG
1294 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1295 {
1296 struct palette_cb_priv *priv = opaque;
1297 VncState *vs = priv->vs;
1298 png_colorp color = &priv->png_palette[idx];
1299
1300 if (vs->tight.pixel24)
1301 {
1302 color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1303 color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1304 color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1305 }
1306 else
1307 {
1308 int red, green, blue;
1309
1310 red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1311 green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1312 blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1313 color->red = ((red * 255 + vs->clientds.pf.rmax / 2) /
1314 vs->clientds.pf.rmax);
1315 color->green = ((green * 255 + vs->clientds.pf.gmax / 2) /
1316 vs->clientds.pf.gmax);
1317 color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) /
1318 vs->clientds.pf.bmax);
1319 }
1320 }
1321
1322 static void png_write_data(png_structp png_ptr, png_bytep data,
1323 png_size_t length)
1324 {
1325 VncState *vs = png_get_io_ptr(png_ptr);
1326
1327 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length);
1328 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length);
1329
1330 vs->tight.png.offset += length;
1331 }
1332
1333 static void png_flush_data(png_structp png_ptr)
1334 {
1335 }
1336
1337 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1338 {
1339 return qemu_malloc(size);
1340 }
1341
1342 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1343 {
1344 qemu_free(ptr);
1345 }
1346
1347 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1348 VncPalette *palette)
1349 {
1350 png_byte color_type;
1351 png_structp png_ptr;
1352 png_infop info_ptr;
1353 png_colorp png_palette = NULL;
1354 size_t offset;
1355 int level = tight_png_conf[vs->tight.compression].png_zlib_level;
1356 int filters = tight_png_conf[vs->tight.compression].png_filters;
1357 uint8_t *buf;
1358 int dy;
1359
1360 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1361 NULL, vnc_png_malloc, vnc_png_free);
1362
1363 if (png_ptr == NULL)
1364 return -1;
1365
1366 info_ptr = png_create_info_struct(png_ptr);
1367
1368 if (info_ptr == NULL) {
1369 png_destroy_write_struct(&png_ptr, NULL);
1370 return -1;
1371 }
1372
1373 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1374 png_set_compression_level(png_ptr, level);
1375 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1376
1377 if (palette) {
1378 color_type = PNG_COLOR_TYPE_PALETTE;
1379 } else {
1380 color_type = PNG_COLOR_TYPE_RGB;
1381 }
1382
1383 png_set_IHDR(png_ptr, info_ptr, w, h,
1384 8, color_type, PNG_INTERLACE_NONE,
1385 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1386
1387 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1388 struct palette_cb_priv priv;
1389
1390 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1391 palette_size(palette));
1392
1393 priv.vs = vs;
1394 priv.png_palette = png_palette;
1395 palette_iter(palette, write_png_palette, &priv);
1396
1397 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1398
1399 offset = vs->tight.tight.offset;
1400 if (vs->clientds.pf.bytes_per_pixel == 4) {
1401 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1402 } else {
1403 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1404 }
1405 }
1406
1407 png_write_info(png_ptr, info_ptr);
1408
1409 buffer_reserve(&vs->tight.png, 2048);
1410 buf = qemu_malloc(w * 3);
1411 for (dy = 0; dy < h; dy++)
1412 {
1413 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1414 memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1415 } else {
1416 rgb_prepare_row(vs, buf, x, y + dy, w);
1417 }
1418 png_write_row(png_ptr, buf);
1419 }
1420 qemu_free(buf);
1421
1422 png_write_end(png_ptr, NULL);
1423
1424 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1425 png_free(png_ptr, png_palette);
1426 }
1427
1428 png_destroy_write_struct(&png_ptr, &info_ptr);
1429
1430 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1431
1432 tight_send_compact_size(vs, vs->tight.png.offset);
1433 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1434 buffer_reset(&vs->tight.png);
1435 return 1;
1436 }
1437 #endif /* CONFIG_VNC_PNG */
1438
1439 static void vnc_tight_start(VncState *vs)
1440 {
1441 buffer_reset(&vs->tight.tight);
1442
1443 // make the output buffer be the zlib buffer, so we can compress it later
1444 vs->tight.tmp = vs->output;
1445 vs->output = vs->tight.tight;
1446 }
1447
1448 static void vnc_tight_stop(VncState *vs)
1449 {
1450 // switch back to normal output/zlib buffers
1451 vs->tight.tight = vs->output;
1452 vs->output = vs->tight.tmp;
1453 }
1454
1455 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1456 int bg, int fg, int colors, VncPalette *palette)
1457 {
1458 int ret;
1459
1460 if (colors == 0) {
1461 if (tight_detect_smooth_image(vs, w, h)) {
1462 ret = send_gradient_rect(vs, x, y, w, h);
1463 } else {
1464 ret = send_full_color_rect(vs, x, y, w, h);
1465 }
1466 } else if (colors == 1) {
1467 ret = send_solid_rect(vs);
1468 } else if (colors == 2) {
1469 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1470 } else if (colors <= 256) {
1471 ret = send_palette_rect(vs, x, y, w, h, palette);
1472 } else {
1473 ret = 0;
1474 }
1475 return ret;
1476 }
1477
1478 #ifdef CONFIG_VNC_JPEG
1479 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1480 int bg, int fg, int colors,
1481 VncPalette *palette)
1482 {
1483 int ret;
1484
1485 if (colors == 0) {
1486 if (tight_detect_smooth_image(vs, w, h)) {
1487 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1488
1489 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1490 } else {
1491 ret = send_full_color_rect(vs, x, y, w, h);
1492 }
1493 } else if (colors == 1) {
1494 ret = send_solid_rect(vs);
1495 } else if (colors == 2) {
1496 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1497 } else if (colors <= 256) {
1498 if (colors > 96 &&
1499 tight_detect_smooth_image(vs, w, h)) {
1500 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1501
1502 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1503 } else {
1504 ret = send_palette_rect(vs, x, y, w, h, palette);
1505 }
1506 }
1507 return ret;
1508 }
1509 #endif
1510
1511 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1512 {
1513 VncPalette *palette = NULL;
1514 uint32_t bg = 0, fg = 0;
1515 int colors;
1516 int ret = 0;
1517
1518 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1519
1520 vnc_tight_start(vs);
1521 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1522 vnc_tight_stop(vs);
1523
1524 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
1525
1526 #ifdef CONFIG_VNC_JPEG
1527 if (vs->tight.quality != (uint8_t)-1) {
1528 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette);
1529 } else {
1530 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1531 }
1532 #else
1533 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1534 #endif
1535
1536 palette_destroy(palette);
1537 return ret;
1538 }
1539
1540 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1541 {
1542 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1543
1544 vnc_tight_start(vs);
1545 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1546 vnc_tight_stop(vs);
1547
1548 return send_solid_rect(vs);
1549 }
1550
1551 static int send_rect_simple(VncState *vs, int x, int y, int w, int h)
1552 {
1553 int max_size, max_width;
1554 int max_sub_width, max_sub_height;
1555 int dx, dy;
1556 int rw, rh;
1557 int n = 0;
1558
1559 max_size = tight_conf[vs->tight.compression].max_rect_size;
1560 max_width = tight_conf[vs->tight.compression].max_rect_width;
1561
1562 if (w > max_width || w * h > max_size) {
1563 max_sub_width = (w > max_width) ? max_width : w;
1564 max_sub_height = max_size / max_sub_width;
1565
1566 for (dy = 0; dy < h; dy += max_sub_height) {
1567 for (dx = 0; dx < w; dx += max_width) {
1568 rw = MIN(max_sub_width, w - dx);
1569 rh = MIN(max_sub_height, h - dy);
1570 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1571 }
1572 }
1573 } else {
1574 n += send_sub_rect(vs, x, y, w, h);
1575 }
1576
1577 return n;
1578 }
1579
1580 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1581 int w, int h, int max_rows)
1582 {
1583 int dx, dy, dw, dh;
1584 int n = 0;
1585
1586 /* Try to find large solid-color areas and send them separately. */
1587
1588 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1589
1590 /* If a rectangle becomes too large, send its upper part now. */
1591
1592 if (dy - y >= max_rows) {
1593 n += send_rect_simple(vs, x, y, w, max_rows);
1594 y += max_rows;
1595 h -= max_rows;
1596 }
1597
1598 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1599
1600 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1601 uint32_t color_value;
1602 int x_best, y_best, w_best, h_best;
1603
1604 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1605
1606 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1607 continue ;
1608 }
1609
1610 /* Get dimensions of solid-color area. */
1611
1612 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1613 color_value, &w_best, &h_best);
1614
1615 /* Make sure a solid rectangle is large enough
1616 (or the whole rectangle is of the same color). */
1617
1618 if (w_best * h_best != w * h &&
1619 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1620 continue;
1621 }
1622
1623 /* Try to extend solid rectangle to maximum size. */
1624
1625 x_best = dx; y_best = dy;
1626 extend_solid_area(vs, x, y, w, h, color_value,
1627 &x_best, &y_best, &w_best, &h_best);
1628
1629 /* Send rectangles at top and left to solid-color area. */
1630
1631 if (y_best != y) {
1632 n += send_rect_simple(vs, x, y, w, y_best-y);
1633 }
1634 if (x_best != x) {
1635 n += tight_send_framebuffer_update(vs, x, y_best,
1636 x_best-x, h_best);
1637 }
1638
1639 /* Send solid-color rectangle. */
1640 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1641
1642 /* Send remaining rectangles (at right and bottom). */
1643
1644 if (x_best + w_best != x + w) {
1645 n += tight_send_framebuffer_update(vs, x_best+w_best,
1646 y_best,
1647 w-(x_best-x)-w_best,
1648 h_best);
1649 }
1650 if (y_best + h_best != y + h) {
1651 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1652 w, h-(y_best-y)-h_best);
1653 }
1654
1655 /* Return after all recursive calls are done. */
1656 return n;
1657 }
1658 }
1659 return n + send_rect_simple(vs, x, y, w, h);
1660 }
1661
1662 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1663 int w, int h)
1664 {
1665 int max_rows;
1666
1667 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
1668 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
1669 vs->tight.pixel24 = true;
1670 } else {
1671 vs->tight.pixel24 = false;
1672 }
1673
1674 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE)
1675 return send_rect_simple(vs, x, y, w, h);
1676
1677 /* Calculate maximum number of rows in one non-solid rectangle. */
1678
1679 max_rows = tight_conf[vs->tight.compression].max_rect_size;
1680 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1681
1682 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1683 }
1684
1685 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1686 int w, int h)
1687 {
1688 vs->tight.type = VNC_ENCODING_TIGHT;
1689 return tight_send_framebuffer_update(vs, x, y, w, h);
1690 }
1691
1692 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1693 int w, int h)
1694 {
1695 vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1696 return tight_send_framebuffer_update(vs, x, y, w, h);
1697 }
1698
1699 void vnc_tight_clear(VncState *vs)
1700 {
1701 int i;
1702 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1703 if (vs->tight.stream[i].opaque) {
1704 deflateEnd(&vs->tight.stream[i]);
1705 }
1706 }
1707
1708 buffer_free(&vs->tight.tight);
1709 buffer_free(&vs->tight.zlib);
1710 buffer_free(&vs->tight.gradient);
1711 #ifdef CONFIG_VNC_JPEG
1712 buffer_free(&vs->tight.jpeg);
1713 #endif
1714 #ifdef CONFIG_VNC_PNG
1715 buffer_free(&vs->tight.png);
1716 #endif
1717 }
various patches