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[qemu/kevin.git] / ui / vnc-enc-tight.c
blobcebd35841a9275ea9d3781081cf63679987b70c9
1 /*
2 * QEMU VNC display driver: tight encoding
3 *
4 * From libvncserver/libvncserver/tight.c
5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
7 *
8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 * THE SOFTWARE.
27 */
28
29 #include "qemu/osdep.h"
30
31 /* This needs to be before jpeglib.h line because of conflict with
32 INT32 definitions between jmorecfg.h (included by jpeglib.h) and
33 Win32 basetsd.h (included by windows.h). */
34
35 #ifdef CONFIG_VNC_PNG
36 /* The following define is needed by pngconf.h. Otherwise it won't compile,
37 because setjmp.h was already included by qemu-common.h. */
38 #define PNG_SKIP_SETJMP_CHECK
39 #include <png.h>
40 #endif
41 #ifdef CONFIG_VNC_JPEG
42 #include <jpeglib.h>
43 #endif
44
45 #include "qemu/bswap.h"
46 #include "vnc.h"
47 #include "vnc-enc-tight.h"
48 #include "vnc-palette.h"
49
50 /* Compression level stuff. The following array contains various
51 encoder parameters for each of 10 compression levels (0..9).
52 Last three parameters correspond to JPEG quality levels (0..9). */
53
54 static const struct {
55 int max_rect_size, max_rect_width;
56 int mono_min_rect_size, gradient_min_rect_size;
57 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
58 int gradient_threshold, gradient_threshold24;
59 int idx_max_colors_divisor;
60 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
61 } tight_conf[] = {
62 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
63 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
64 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
65 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
66 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
67 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
68 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
69 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
70 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
71 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
72 };
73
74
75 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
76 int w, int h);
77
78 #ifdef CONFIG_VNC_JPEG
79 static const struct {
80 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */
81 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
82 int jpeg_idx; /* Allow indexed JPEG */
83 int jpeg_full; /* Allow full color JPEG */
84 } tight_jpeg_conf[] = {
85 { 0, 8, 1, 1 },
86 { 0, 8, 1, 1 },
87 { 0, 8, 1, 1 },
88 { 0, 8, 1, 1 },
89 { 0, 10, 1, 1 },
90 { 0.1, 10, 1, 1 },
91 { 0.2, 10, 1, 1 },
92 { 0.3, 12, 0, 0 },
93 { 0.4, 14, 0, 0 },
94 { 0.5, 16, 0, 0 },
95 };
96 #endif
97
98 #ifdef CONFIG_VNC_PNG
99 static const struct {
100 int png_zlib_level, png_filters;
101 } tight_png_conf[] = {
102 { 0, PNG_NO_FILTERS },
103 { 1, PNG_NO_FILTERS },
104 { 2, PNG_NO_FILTERS },
105 { 3, PNG_NO_FILTERS },
106 { 4, PNG_NO_FILTERS },
107 { 5, PNG_ALL_FILTERS },
108 { 6, PNG_ALL_FILTERS },
109 { 7, PNG_ALL_FILTERS },
110 { 8, PNG_ALL_FILTERS },
111 { 9, PNG_ALL_FILTERS },
112 };
113
114 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
115 VncPalette *palette);
116
117 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
118 {
119 if (vs->tight->type != VNC_ENCODING_TIGHT_PNG) {
120 return false;
121 }
122
123 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
124 vs->client_pf.bytes_per_pixel == 1) {
125 return false;
126 }
127
128 return true;
129 }
130 #endif
131
132 /*
133 * Code to guess if given rectangle is suitable for smooth image
134 * compression (by applying "gradient" filter or JPEG coder).
135 */
136
137 static unsigned int
138 tight_detect_smooth_image24(VncState *vs, int w, int h)
139 {
140 int off;
141 int x, y, d, dx;
142 unsigned int c;
143 unsigned int stats[256];
144 int pixels = 0;
145 int pix, left[3];
146 unsigned int errors;
147 unsigned char *buf = vs->tight->tight.buffer;
148
149 /*
150 * If client is big-endian, color samples begin from the second
151 * byte (offset 1) of a 32-bit pixel value.
152 */
153 off = vs->client_be;
154
155 memset(stats, 0, sizeof (stats));
156
157 for (y = 0, x = 0; y < h && x < w;) {
158 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
159 d++) {
160 for (c = 0; c < 3; c++) {
161 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
162 }
163 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
164 for (c = 0; c < 3; c++) {
165 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
166 stats[abs(pix - left[c])]++;
167 left[c] = pix;
168 }
169 pixels++;
170 }
171 }
172 if (w > h) {
173 x += h;
174 y = 0;
175 } else {
176 x = 0;
177 y += w;
178 }
179 }
180
181 if (pixels == 0) {
182 return 0;
183 }
184
185 /* 95% smooth or more ... */
186 if (stats[0] * 33 / pixels >= 95) {
187 return 0;
188 }
189
190 errors = 0;
191 for (c = 1; c < 8; c++) {
192 errors += stats[c] * (c * c);
193 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
194 return 0;
195 }
196 }
197 for (; c < 256; c++) {
198 errors += stats[c] * (c * c);
199 }
200 errors /= (pixels * 3 - stats[0]);
201
202 return errors;
203 }
204
205 #define DEFINE_DETECT_FUNCTION(bpp) \
206 \
207 static unsigned int \
208 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
209 bool endian; \
210 uint##bpp##_t pix; \
211 int max[3], shift[3]; \
212 int x, y, d, dx; \
213 unsigned int c; \
214 unsigned int stats[256]; \
215 int pixels = 0; \
216 int sample, sum, left[3]; \
217 unsigned int errors; \
218 unsigned char *buf = vs->tight->tight.buffer; \
219 \
220 endian = 0; /* FIXME */ \
221 \
222 \
223 max[0] = vs->client_pf.rmax; \
224 max[1] = vs->client_pf.gmax; \
225 max[2] = vs->client_pf.bmax; \
226 shift[0] = vs->client_pf.rshift; \
227 shift[1] = vs->client_pf.gshift; \
228 shift[2] = vs->client_pf.bshift; \
229 \
230 memset(stats, 0, sizeof(stats)); \
231 \
232 y = 0, x = 0; \
233 while (y < h && x < w) { \
234 for (d = 0; d < h - y && \
235 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
236 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
237 if (endian) { \
238 pix = bswap##bpp(pix); \
239 } \
240 for (c = 0; c < 3; c++) { \
241 left[c] = (int)(pix >> shift[c] & max[c]); \
242 } \
243 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
244 dx++) { \
245 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
246 if (endian) { \
247 pix = bswap##bpp(pix); \
248 } \
249 sum = 0; \
250 for (c = 0; c < 3; c++) { \
251 sample = (int)(pix >> shift[c] & max[c]); \
252 sum += abs(sample - left[c]); \
253 left[c] = sample; \
254 } \
255 if (sum > 255) { \
256 sum = 255; \
257 } \
258 stats[sum]++; \
259 pixels++; \
260 } \
261 } \
262 if (w > h) { \
263 x += h; \
264 y = 0; \
265 } else { \
266 x = 0; \
267 y += w; \
268 } \
269 } \
270 if (pixels == 0) { \
271 return 0; \
272 } \
273 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
274 return 0; \
275 } \
276 \
277 errors = 0; \
278 for (c = 1; c < 8; c++) { \
279 errors += stats[c] * (c * c); \
280 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
281 return 0; \
282 } \
283 } \
284 for (; c < 256; c++) { \
285 errors += stats[c] * (c * c); \
286 } \
287 errors /= (pixels - stats[0]); \
288 \
289 return errors; \
290 }
291
292 DEFINE_DETECT_FUNCTION(16)
293 DEFINE_DETECT_FUNCTION(32)
294
295 static int
296 tight_detect_smooth_image(VncState *vs, int w, int h)
297 {
298 unsigned int errors;
299 int compression = vs->tight->compression;
300 int quality = vs->tight->quality;
301
302 if (!vs->vd->lossy) {
303 return 0;
304 }
305
306 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
307 vs->client_pf.bytes_per_pixel == 1 ||
308 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
309 return 0;
310 }
311
312 if (vs->tight->quality != (uint8_t)-1) {
313 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
314 return 0;
315 }
316 } else {
317 if (w * h < tight_conf[compression].gradient_min_rect_size) {
318 return 0;
319 }
320 }
321
322 if (vs->client_pf.bytes_per_pixel == 4) {
323 if (vs->tight->pixel24) {
324 errors = tight_detect_smooth_image24(vs, w, h);
325 if (vs->tight->quality != (uint8_t)-1) {
326 return (errors < tight_conf[quality].jpeg_threshold24);
327 }
328 return (errors < tight_conf[compression].gradient_threshold24);
329 } else {
330 errors = tight_detect_smooth_image32(vs, w, h);
331 }
332 } else {
333 errors = tight_detect_smooth_image16(vs, w, h);
334 }
335 if (quality != (uint8_t)-1) {
336 return (errors < tight_conf[quality].jpeg_threshold);
337 }
338 return (errors < tight_conf[compression].gradient_threshold);
339 }
340
341 /*
342 * Code to determine how many different colors used in rectangle.
343 */
344 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
345 \
346 static int \
347 tight_fill_palette##bpp(VncState *vs, int x, int y, \
348 int max, size_t count, \
349 uint32_t *bg, uint32_t *fg, \
350 VncPalette *palette) { \
351 uint##bpp##_t *data; \
352 uint##bpp##_t c0, c1, ci; \
353 int i, n0, n1; \
354 \
355 data = (uint##bpp##_t *)vs->tight->tight.buffer; \
356 \
357 c0 = data[0]; \
358 i = 1; \
359 while (i < count && data[i] == c0) \
360 i++; \
361 if (i >= count) { \
362 *bg = *fg = c0; \
363 return 1; \
364 } \
365 \
366 if (max < 2) { \
367 return 0; \
368 } \
369 \
370 n0 = i; \
371 c1 = data[i]; \
372 n1 = 0; \
373 for (i++; i < count; i++) { \
374 ci = data[i]; \
375 if (ci == c0) { \
376 n0++; \
377 } else if (ci == c1) { \
378 n1++; \
379 } else \
380 break; \
381 } \
382 if (i >= count) { \
383 if (n0 > n1) { \
384 *bg = (uint32_t)c0; \
385 *fg = (uint32_t)c1; \
386 } else { \
387 *bg = (uint32_t)c1; \
388 *fg = (uint32_t)c0; \
389 } \
390 return 2; \
391 } \
392 \
393 if (max == 2) { \
394 return 0; \
395 } \
396 \
397 palette_init(palette, max, bpp); \
398 palette_put(palette, c0); \
399 palette_put(palette, c1); \
400 palette_put(palette, ci); \
401 \
402 for (i++; i < count; i++) { \
403 if (data[i] == ci) { \
404 continue; \
405 } else { \
406 ci = data[i]; \
407 if (!palette_put(palette, (uint32_t)ci)) { \
408 return 0; \
409 } \
410 } \
411 } \
412 \
413 return palette_size(palette); \
414 }
415
416 DEFINE_FILL_PALETTE_FUNCTION(8)
417 DEFINE_FILL_PALETTE_FUNCTION(16)
418 DEFINE_FILL_PALETTE_FUNCTION(32)
419
420 static int tight_fill_palette(VncState *vs, int x, int y,
421 size_t count, uint32_t *bg, uint32_t *fg,
422 VncPalette *palette)
423 {
424 int max;
425
426 max = count / tight_conf[vs->tight->compression].idx_max_colors_divisor;
427 if (max < 2 &&
428 count >= tight_conf[vs->tight->compression].mono_min_rect_size) {
429 max = 2;
430 }
431 if (max >= 256) {
432 max = 256;
433 }
434
435 switch (vs->client_pf.bytes_per_pixel) {
436 case 4:
437 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
438 case 2:
439 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
440 default:
441 max = 2;
442 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
443 }
444 return 0;
445 }
446
447 /*
448 * Converting truecolor samples into palette indices.
449 */
450 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
451 \
452 static void \
453 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
454 VncPalette *palette) { \
455 uint##bpp##_t *src; \
456 uint##bpp##_t rgb; \
457 int i, rep; \
458 uint8_t idx; \
459 \
460 src = (uint##bpp##_t *) buf; \
461 \
462 for (i = 0; i < count; ) { \
463 \
464 rgb = *src++; \
465 i++; \
466 rep = 0; \
467 while (i < count && *src == rgb) { \
468 rep++, src++, i++; \
469 } \
470 idx = palette_idx(palette, rgb); \
471 /* \
472 * Should never happen, but don't break everything \
473 * if it does, use the first color instead \
474 */ \
475 if (idx == (uint8_t)-1) { \
476 idx = 0; \
477 } \
478 while (rep >= 0) { \
479 *buf++ = idx; \
480 rep--; \
481 } \
482 } \
483 }
484
485 DEFINE_IDX_ENCODE_FUNCTION(16)
486 DEFINE_IDX_ENCODE_FUNCTION(32)
487
488 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
489 \
490 static void \
491 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
492 uint##bpp##_t bg, uint##bpp##_t fg) { \
493 uint##bpp##_t *ptr; \
494 unsigned int value, mask; \
495 int aligned_width; \
496 int x, y, bg_bits; \
497 \
498 ptr = (uint##bpp##_t *) buf; \
499 aligned_width = w - w % 8; \
500 \
501 for (y = 0; y < h; y++) { \
502 for (x = 0; x < aligned_width; x += 8) { \
503 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
504 if (*ptr++ != bg) { \
505 break; \
506 } \
507 } \
508 if (bg_bits == 8) { \
509 *buf++ = 0; \
510 continue; \
511 } \
512 mask = 0x80 >> bg_bits; \
513 value = mask; \
514 for (bg_bits++; bg_bits < 8; bg_bits++) { \
515 mask >>= 1; \
516 if (*ptr++ != bg) { \
517 value |= mask; \
518 } \
519 } \
520 *buf++ = (uint8_t)value; \
521 } \
522 \
523 mask = 0x80; \
524 value = 0; \
525 if (x >= w) { \
526 continue; \
527 } \
528 \
529 for (; x < w; x++) { \
530 if (*ptr++ != bg) { \
531 value |= mask; \
532 } \
533 mask >>= 1; \
534 } \
535 *buf++ = (uint8_t)value; \
536 } \
537 }
538
539 DEFINE_MONO_ENCODE_FUNCTION(8)
540 DEFINE_MONO_ENCODE_FUNCTION(16)
541 DEFINE_MONO_ENCODE_FUNCTION(32)
542
543 /*
544 * ``Gradient'' filter for 24-bit color samples.
545 * Should be called only when redMax, greenMax and blueMax are 255.
546 * Color components assumed to be byte-aligned.
547 */
548
549 static void
550 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
551 {
552 uint32_t *buf32;
553 uint32_t pix32;
554 int shift[3];
555 int *prev;
556 int here[3], upper[3], left[3], upperleft[3];
557 int prediction;
558 int x, y, c;
559
560 buf32 = (uint32_t *)buf;
561 memset(vs->tight->gradient.buffer, 0, w * 3 * sizeof(int));
562
563 if (1 /* FIXME */) {
564 shift[0] = vs->client_pf.rshift;
565 shift[1] = vs->client_pf.gshift;
566 shift[2] = vs->client_pf.bshift;
567 } else {
568 shift[0] = 24 - vs->client_pf.rshift;
569 shift[1] = 24 - vs->client_pf.gshift;
570 shift[2] = 24 - vs->client_pf.bshift;
571 }
572
573 for (y = 0; y < h; y++) {
574 for (c = 0; c < 3; c++) {
575 upper[c] = 0;
576 here[c] = 0;
577 }
578 prev = (int *)vs->tight->gradient.buffer;
579 for (x = 0; x < w; x++) {
580 pix32 = *buf32++;
581 for (c = 0; c < 3; c++) {
582 upperleft[c] = upper[c];
583 left[c] = here[c];
584 upper[c] = *prev;
585 here[c] = (int)(pix32 >> shift[c] & 0xFF);
586 *prev++ = here[c];
587
588 prediction = left[c] + upper[c] - upperleft[c];
589 if (prediction < 0) {
590 prediction = 0;
591 } else if (prediction > 0xFF) {
592 prediction = 0xFF;
593 }
594 *buf++ = (char)(here[c] - prediction);
595 }
596 }
597 }
598 }
599
600
601 /*
602 * ``Gradient'' filter for other color depths.
603 */
604
605 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
606 \
607 static void \
608 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
609 int w, int h) { \
610 uint##bpp##_t pix, diff; \
611 bool endian; \
612 int *prev; \
613 int max[3], shift[3]; \
614 int here[3], upper[3], left[3], upperleft[3]; \
615 int prediction; \
616 int x, y, c; \
617 \
618 memset(vs->tight->gradient.buffer, 0, w * 3 * sizeof(int)); \
619 \
620 endian = 0; /* FIXME */ \
621 \
622 max[0] = vs->client_pf.rmax; \
623 max[1] = vs->client_pf.gmax; \
624 max[2] = vs->client_pf.bmax; \
625 shift[0] = vs->client_pf.rshift; \
626 shift[1] = vs->client_pf.gshift; \
627 shift[2] = vs->client_pf.bshift; \
628 \
629 for (y = 0; y < h; y++) { \
630 for (c = 0; c < 3; c++) { \
631 upper[c] = 0; \
632 here[c] = 0; \
633 } \
634 prev = (int *)vs->tight->gradient.buffer; \
635 for (x = 0; x < w; x++) { \
636 pix = *buf; \
637 if (endian) { \
638 pix = bswap##bpp(pix); \
639 } \
640 diff = 0; \
641 for (c = 0; c < 3; c++) { \
642 upperleft[c] = upper[c]; \
643 left[c] = here[c]; \
644 upper[c] = *prev; \
645 here[c] = (int)(pix >> shift[c] & max[c]); \
646 *prev++ = here[c]; \
647 \
648 prediction = left[c] + upper[c] - upperleft[c]; \
649 if (prediction < 0) { \
650 prediction = 0; \
651 } else if (prediction > max[c]) { \
652 prediction = max[c]; \
653 } \
654 diff |= ((here[c] - prediction) & max[c]) \
655 << shift[c]; \
656 } \
657 if (endian) { \
658 diff = bswap##bpp(diff); \
659 } \
660 *buf++ = diff; \
661 } \
662 } \
663 }
664
665 DEFINE_GRADIENT_FILTER_FUNCTION(16)
666 DEFINE_GRADIENT_FILTER_FUNCTION(32)
667
668 /*
669 * Check if a rectangle is all of the same color. If needSameColor is
670 * set to non-zero, then also check that its color equals to the
671 * *colorPtr value. The result is 1 if the test is successful, and in
672 * that case new color will be stored in *colorPtr.
673 */
674
675 static bool
676 check_solid_tile32(VncState *vs, int x, int y, int w, int h,
677 uint32_t *color, bool samecolor)
678 {
679 VncDisplay *vd = vs->vd;
680 uint32_t *fbptr;
681 uint32_t c;
682 int dx, dy;
683
684 fbptr = vnc_server_fb_ptr(vd, x, y);
685
686 c = *fbptr;
687 if (samecolor && (uint32_t)c != *color) {
688 return false;
689 }
690
691 for (dy = 0; dy < h; dy++) {
692 for (dx = 0; dx < w; dx++) {
693 if (c != fbptr[dx]) {
694 return false;
695 }
696 }
697 fbptr = (uint32_t *)
698 ((uint8_t *)fbptr + vnc_server_fb_stride(vd));
699 }
700
701 *color = (uint32_t)c;
702 return true;
703 }
704
705 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
706 uint32_t* color, bool samecolor)
707 {
708 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4);
709 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
710 }
711
712 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
713 uint32_t color, int *w_ptr, int *h_ptr)
714 {
715 int dx, dy, dw, dh;
716 int w_prev;
717 int w_best = 0, h_best = 0;
718
719 w_prev = w;
720
721 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
722
723 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
724 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
725
726 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
727 break;
728 }
729
730 for (dx = x + dw; dx < x + w_prev;) {
731 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
732
733 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
734 break;
735 }
736 dx += dw;
737 }
738
739 w_prev = dx - x;
740 if (w_prev * (dy + dh - y) > w_best * h_best) {
741 w_best = w_prev;
742 h_best = dy + dh - y;
743 }
744 }
745
746 *w_ptr = w_best;
747 *h_ptr = h_best;
748 }
749
750 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
751 uint32_t color, int *x_ptr, int *y_ptr,
752 int *w_ptr, int *h_ptr)
753 {
754 int cx, cy;
755
756 /* Try to extend the area upwards. */
757 for ( cy = *y_ptr - 1;
758 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
759 cy-- );
760 *h_ptr += *y_ptr - (cy + 1);
761 *y_ptr = cy + 1;
762
763 /* ... downwards. */
764 for ( cy = *y_ptr + *h_ptr;
765 cy < y + h &&
766 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
767 cy++ );
768 *h_ptr += cy - (*y_ptr + *h_ptr);
769
770 /* ... to the left. */
771 for ( cx = *x_ptr - 1;
772 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
773 cx-- );
774 *w_ptr += *x_ptr - (cx + 1);
775 *x_ptr = cx + 1;
776
777 /* ... to the right. */
778 for ( cx = *x_ptr + *w_ptr;
779 cx < x + w &&
780 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
781 cx++ );
782 *w_ptr += cx - (*x_ptr + *w_ptr);
783 }
784
785 static int tight_init_stream(VncState *vs, int stream_id,
786 int level, int strategy)
787 {
788 z_streamp zstream = &vs->tight->stream[stream_id];
789
790 if (zstream->opaque == NULL) {
791 int err;
792
793 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
794 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
795 zstream->zalloc = vnc_zlib_zalloc;
796 zstream->zfree = vnc_zlib_zfree;
797
798 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
799 MAX_MEM_LEVEL, strategy);
800
801 if (err != Z_OK) {
802 fprintf(stderr, "VNC: error initializing zlib\n");
803 return -1;
804 }
805
806 vs->tight->levels[stream_id] = level;
807 zstream->opaque = vs;
808 }
809
810 if (vs->tight->levels[stream_id] != level) {
811 if (deflateParams(zstream, level, strategy) != Z_OK) {
812 return -1;
813 }
814 vs->tight->levels[stream_id] = level;
815 }
816 return 0;
817 }
818
819 static void tight_send_compact_size(VncState *vs, size_t len)
820 {
821 int lpc = 0;
822 int bytes = 0;
823 char buf[3] = {0, 0, 0};
824
825 buf[bytes++] = len & 0x7F;
826 if (len > 0x7F) {
827 buf[bytes-1] |= 0x80;
828 buf[bytes++] = (len >> 7) & 0x7F;
829 if (len > 0x3FFF) {
830 buf[bytes-1] |= 0x80;
831 buf[bytes++] = (len >> 14) & 0xFF;
832 }
833 }
834 for (lpc = 0; lpc < bytes; lpc++) {
835 vnc_write_u8(vs, buf[lpc]);
836 }
837 }
838
839 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
840 int level, int strategy)
841 {
842 z_streamp zstream = &vs->tight->stream[stream_id];
843 int previous_out;
844
845 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
846 vnc_write(vs, vs->tight->tight.buffer, vs->tight->tight.offset);
847 return bytes;
848 }
849
850 if (tight_init_stream(vs, stream_id, level, strategy)) {
851 return -1;
852 }
853
854 /* reserve memory in output buffer */
855 buffer_reserve(&vs->tight->zlib, bytes + 64);
856
857 /* set pointers */
858 zstream->next_in = vs->tight->tight.buffer;
859 zstream->avail_in = vs->tight->tight.offset;
860 zstream->next_out = vs->tight->zlib.buffer + vs->tight->zlib.offset;
861 zstream->avail_out = vs->tight->zlib.capacity - vs->tight->zlib.offset;
862 previous_out = zstream->avail_out;
863 zstream->data_type = Z_BINARY;
864
865 /* start encoding */
866 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
867 fprintf(stderr, "VNC: error during tight compression\n");
868 return -1;
869 }
870
871 vs->tight->zlib.offset = vs->tight->zlib.capacity - zstream->avail_out;
872 /* ...how much data has actually been produced by deflate() */
873 bytes = previous_out - zstream->avail_out;
874
875 tight_send_compact_size(vs, bytes);
876 vnc_write(vs, vs->tight->zlib.buffer, bytes);
877
878 buffer_reset(&vs->tight->zlib);
879
880 return bytes;
881 }
882
883 /*
884 * Subencoding implementations.
885 */
886 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
887 {
888 uint8_t *buf8;
889 uint32_t pix;
890 int rshift, gshift, bshift;
891
892 buf8 = buf;
893
894 if (1 /* FIXME */) {
895 rshift = vs->client_pf.rshift;
896 gshift = vs->client_pf.gshift;
897 bshift = vs->client_pf.bshift;
898 } else {
899 rshift = 24 - vs->client_pf.rshift;
900 gshift = 24 - vs->client_pf.gshift;
901 bshift = 24 - vs->client_pf.bshift;
902 }
903
904 if (ret) {
905 *ret = count * 3;
906 }
907
908 while (count--) {
909 pix = ldl_he_p(buf8);
910 *buf++ = (char)(pix >> rshift);
911 *buf++ = (char)(pix >> gshift);
912 *buf++ = (char)(pix >> bshift);
913 buf8 += 4;
914 }
915 }
916
917 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
918 {
919 int stream = 0;
920 ssize_t bytes;
921
922 #ifdef CONFIG_VNC_PNG
923 if (tight_can_send_png_rect(vs, w, h)) {
924 return send_png_rect(vs, x, y, w, h, NULL);
925 }
926 #endif
927
928 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
929
930 if (vs->tight->pixel24) {
931 tight_pack24(vs, vs->tight->tight.buffer, w * h,
932 &vs->tight->tight.offset);
933 bytes = 3;
934 } else {
935 bytes = vs->client_pf.bytes_per_pixel;
936 }
937
938 bytes = tight_compress_data(vs, stream, w * h * bytes,
939 tight_conf[vs->tight->compression].raw_zlib_level,
940 Z_DEFAULT_STRATEGY);
941
942 return (bytes >= 0);
943 }
944
945 static int send_solid_rect(VncState *vs)
946 {
947 size_t bytes;
948
949 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
950
951 if (vs->tight->pixel24) {
952 tight_pack24(vs, vs->tight->tight.buffer, 1, &vs->tight->tight.offset);
953 bytes = 3;
954 } else {
955 bytes = vs->client_pf.bytes_per_pixel;
956 }
957
958 vnc_write(vs, vs->tight->tight.buffer, bytes);
959 return 1;
960 }
961
962 static int send_mono_rect(VncState *vs, int x, int y,
963 int w, int h, uint32_t bg, uint32_t fg)
964 {
965 ssize_t bytes;
966 int stream = 1;
967 int level = tight_conf[vs->tight->compression].mono_zlib_level;
968
969 #ifdef CONFIG_VNC_PNG
970 if (tight_can_send_png_rect(vs, w, h)) {
971 int ret;
972 int bpp = vs->client_pf.bytes_per_pixel * 8;
973 VncPalette *palette = palette_new(2, bpp);
974
975 palette_put(palette, bg);
976 palette_put(palette, fg);
977 ret = send_png_rect(vs, x, y, w, h, palette);
978 palette_destroy(palette);
979 return ret;
980 }
981 #endif
982
983 bytes = DIV_ROUND_UP(w, 8) * h;
984
985 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
986 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
987 vnc_write_u8(vs, 1);
988
989 switch (vs->client_pf.bytes_per_pixel) {
990 case 4:
991 {
992 uint32_t buf[2] = {bg, fg};
993 size_t ret = sizeof (buf);
994
995 if (vs->tight->pixel24) {
996 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
997 }
998 vnc_write(vs, buf, ret);
999
1000 tight_encode_mono_rect32(vs->tight->tight.buffer, w, h, bg, fg);
1001 break;
1002 }
1003 case 2:
1004 vnc_write(vs, &bg, 2);
1005 vnc_write(vs, &fg, 2);
1006 tight_encode_mono_rect16(vs->tight->tight.buffer, w, h, bg, fg);
1007 break;
1008 default:
1009 vnc_write_u8(vs, bg);
1010 vnc_write_u8(vs, fg);
1011 tight_encode_mono_rect8(vs->tight->tight.buffer, w, h, bg, fg);
1012 break;
1013 }
1014 vs->tight->tight.offset = bytes;
1015
1016 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1017 return (bytes >= 0);
1018 }
1019
1020 struct palette_cb_priv {
1021 VncState *vs;
1022 uint8_t *header;
1023 #ifdef CONFIG_VNC_PNG
1024 png_colorp png_palette;
1025 #endif
1026 };
1027
1028 static void write_palette(int idx, uint32_t color, void *opaque)
1029 {
1030 struct palette_cb_priv *priv = opaque;
1031 VncState *vs = priv->vs;
1032 uint32_t bytes = vs->client_pf.bytes_per_pixel;
1033
1034 if (bytes == 4) {
1035 ((uint32_t*)priv->header)[idx] = color;
1036 } else {
1037 ((uint16_t*)priv->header)[idx] = color;
1038 }
1039 }
1040
1041 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h)
1042 {
1043 int stream = 3;
1044 int level = tight_conf[vs->tight->compression].gradient_zlib_level;
1045 ssize_t bytes;
1046
1047 if (vs->client_pf.bytes_per_pixel == 1) {
1048 return send_full_color_rect(vs, x, y, w, h);
1049 }
1050
1051 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1052 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1053
1054 buffer_reserve(&vs->tight->gradient, w * 3 * sizeof(int));
1055
1056 if (vs->tight->pixel24) {
1057 tight_filter_gradient24(vs, vs->tight->tight.buffer, w, h);
1058 bytes = 3;
1059 } else if (vs->client_pf.bytes_per_pixel == 4) {
1060 tight_filter_gradient32(vs, (uint32_t *)vs->tight->tight.buffer, w, h);
1061 bytes = 4;
1062 } else {
1063 tight_filter_gradient16(vs, (uint16_t *)vs->tight->tight.buffer, w, h);
1064 bytes = 2;
1065 }
1066
1067 buffer_reset(&vs->tight->gradient);
1068
1069 bytes = w * h * bytes;
1070 vs->tight->tight.offset = bytes;
1071
1072 bytes = tight_compress_data(vs, stream, bytes,
1073 level, Z_FILTERED);
1074 return (bytes >= 0);
1075 }
1076
1077 static int send_palette_rect(VncState *vs, int x, int y,
1078 int w, int h, VncPalette *palette)
1079 {
1080 int stream = 2;
1081 int level = tight_conf[vs->tight->compression].idx_zlib_level;
1082 int colors;
1083 ssize_t bytes;
1084
1085 #ifdef CONFIG_VNC_PNG
1086 if (tight_can_send_png_rect(vs, w, h)) {
1087 return send_png_rect(vs, x, y, w, h, palette);
1088 }
1089 #endif
1090
1091 colors = palette_size(palette);
1092
1093 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1094 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1095 vnc_write_u8(vs, colors - 1);
1096
1097 switch (vs->client_pf.bytes_per_pixel) {
1098 case 4:
1099 {
1100 size_t old_offset, offset;
1101 uint32_t header[palette_size(palette)];
1102 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1103
1104 old_offset = vs->output.offset;
1105 palette_iter(palette, write_palette, &priv);
1106 vnc_write(vs, header, sizeof(header));
1107
1108 if (vs->tight->pixel24) {
1109 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1110 vs->output.offset = old_offset + offset;
1111 }
1112
1113 tight_encode_indexed_rect32(vs->tight->tight.buffer, w * h, palette);
1114 break;
1115 }
1116 case 2:
1117 {
1118 uint16_t header[palette_size(palette)];
1119 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1120
1121 palette_iter(palette, write_palette, &priv);
1122 vnc_write(vs, header, sizeof(header));
1123 tight_encode_indexed_rect16(vs->tight->tight.buffer, w * h, palette);
1124 break;
1125 }
1126 default:
1127 return -1; /* No palette for 8bits colors */
1128 }
1129 bytes = w * h;
1130 vs->tight->tight.offset = bytes;
1131
1132 bytes = tight_compress_data(vs, stream, bytes,
1133 level, Z_DEFAULT_STRATEGY);
1134 return (bytes >= 0);
1135 }
1136
1137 /*
1138 * JPEG compression stuff.
1139 */
1140 #ifdef CONFIG_VNC_JPEG
1141 /*
1142 * Destination manager implementation for JPEG library.
1143 */
1144
1145 /* This is called once per encoding */
1146 static void jpeg_init_destination(j_compress_ptr cinfo)
1147 {
1148 VncState *vs = cinfo->client_data;
1149 Buffer *buffer = &vs->tight->jpeg;
1150
1151 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1152 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1153 }
1154
1155 /* This is called when we ran out of buffer (shouldn't happen!) */
1156 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1157 {
1158 VncState *vs = cinfo->client_data;
1159 Buffer *buffer = &vs->tight->jpeg;
1160
1161 buffer->offset = buffer->capacity;
1162 buffer_reserve(buffer, 2048);
1163 jpeg_init_destination(cinfo);
1164 return TRUE;
1165 }
1166
1167 /* This is called when we are done processing data */
1168 static void jpeg_term_destination(j_compress_ptr cinfo)
1169 {
1170 VncState *vs = cinfo->client_data;
1171 Buffer *buffer = &vs->tight->jpeg;
1172
1173 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1174 }
1175
1176 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1177 {
1178 struct jpeg_compress_struct cinfo;
1179 struct jpeg_error_mgr jerr;
1180 struct jpeg_destination_mgr manager;
1181 pixman_image_t *linebuf;
1182 JSAMPROW row[1];
1183 uint8_t *buf;
1184 int dy;
1185
1186 if (surface_bytes_per_pixel(vs->vd->ds) == 1) {
1187 return send_full_color_rect(vs, x, y, w, h);
1188 }
1189
1190 buffer_reserve(&vs->tight->jpeg, 2048);
1191
1192 cinfo.err = jpeg_std_error(&jerr);
1193 jpeg_create_compress(&cinfo);
1194
1195 cinfo.client_data = vs;
1196 cinfo.image_width = w;
1197 cinfo.image_height = h;
1198 cinfo.input_components = 3;
1199 cinfo.in_color_space = JCS_RGB;
1200
1201 jpeg_set_defaults(&cinfo);
1202 jpeg_set_quality(&cinfo, quality, true);
1203
1204 manager.init_destination = jpeg_init_destination;
1205 manager.empty_output_buffer = jpeg_empty_output_buffer;
1206 manager.term_destination = jpeg_term_destination;
1207 cinfo.dest = &manager;
1208
1209 jpeg_start_compress(&cinfo, true);
1210
1211 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1212 buf = (uint8_t *)pixman_image_get_data(linebuf);
1213 row[0] = buf;
1214 for (dy = 0; dy < h; dy++) {
1215 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1216 jpeg_write_scanlines(&cinfo, row, 1);
1217 }
1218 qemu_pixman_image_unref(linebuf);
1219
1220 jpeg_finish_compress(&cinfo);
1221 jpeg_destroy_compress(&cinfo);
1222
1223 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1224
1225 tight_send_compact_size(vs, vs->tight->jpeg.offset);
1226 vnc_write(vs, vs->tight->jpeg.buffer, vs->tight->jpeg.offset);
1227 buffer_reset(&vs->tight->jpeg);
1228
1229 return 1;
1230 }
1231 #endif /* CONFIG_VNC_JPEG */
1232
1233 /*
1234 * PNG compression stuff.
1235 */
1236 #ifdef CONFIG_VNC_PNG
1237 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1238 {
1239 struct palette_cb_priv *priv = opaque;
1240 VncState *vs = priv->vs;
1241 png_colorp color = &priv->png_palette[idx];
1242
1243 if (vs->tight->pixel24)
1244 {
1245 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1246 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1247 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1248 }
1249 else
1250 {
1251 int red, green, blue;
1252
1253 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1254 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1255 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1256 color->red = ((red * 255 + vs->client_pf.rmax / 2) /
1257 vs->client_pf.rmax);
1258 color->green = ((green * 255 + vs->client_pf.gmax / 2) /
1259 vs->client_pf.gmax);
1260 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) /
1261 vs->client_pf.bmax);
1262 }
1263 }
1264
1265 static void png_write_data(png_structp png_ptr, png_bytep data,
1266 png_size_t length)
1267 {
1268 VncState *vs = png_get_io_ptr(png_ptr);
1269
1270 buffer_reserve(&vs->tight->png, vs->tight->png.offset + length);
1271 memcpy(vs->tight->png.buffer + vs->tight->png.offset, data, length);
1272
1273 vs->tight->png.offset += length;
1274 }
1275
1276 static void png_flush_data(png_structp png_ptr)
1277 {
1278 }
1279
1280 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1281 {
1282 return g_malloc(size);
1283 }
1284
1285 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1286 {
1287 g_free(ptr);
1288 }
1289
1290 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1291 VncPalette *palette)
1292 {
1293 png_byte color_type;
1294 png_structp png_ptr;
1295 png_infop info_ptr;
1296 png_colorp png_palette = NULL;
1297 pixman_image_t *linebuf;
1298 int level = tight_png_conf[vs->tight->compression].png_zlib_level;
1299 int filters = tight_png_conf[vs->tight->compression].png_filters;
1300 uint8_t *buf;
1301 int dy;
1302
1303 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1304 NULL, vnc_png_malloc, vnc_png_free);
1305
1306 if (png_ptr == NULL)
1307 return -1;
1308
1309 info_ptr = png_create_info_struct(png_ptr);
1310
1311 if (info_ptr == NULL) {
1312 png_destroy_write_struct(&png_ptr, NULL);
1313 return -1;
1314 }
1315
1316 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1317 png_set_compression_level(png_ptr, level);
1318 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1319
1320 if (palette) {
1321 color_type = PNG_COLOR_TYPE_PALETTE;
1322 } else {
1323 color_type = PNG_COLOR_TYPE_RGB;
1324 }
1325
1326 png_set_IHDR(png_ptr, info_ptr, w, h,
1327 8, color_type, PNG_INTERLACE_NONE,
1328 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1329
1330 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1331 struct palette_cb_priv priv;
1332
1333 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1334 palette_size(palette));
1335
1336 priv.vs = vs;
1337 priv.png_palette = png_palette;
1338 palette_iter(palette, write_png_palette, &priv);
1339
1340 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1341
1342 if (vs->client_pf.bytes_per_pixel == 4) {
1343 tight_encode_indexed_rect32(vs->tight->tight.buffer, w * h,
1344 palette);
1345 } else {
1346 tight_encode_indexed_rect16(vs->tight->tight.buffer, w * h,
1347 palette);
1348 }
1349 }
1350
1351 png_write_info(png_ptr, info_ptr);
1352
1353 buffer_reserve(&vs->tight->png, 2048);
1354 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1355 buf = (uint8_t *)pixman_image_get_data(linebuf);
1356 for (dy = 0; dy < h; dy++)
1357 {
1358 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1359 memcpy(buf, vs->tight->tight.buffer + (dy * w), w);
1360 } else {
1361 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1362 }
1363 png_write_row(png_ptr, buf);
1364 }
1365 qemu_pixman_image_unref(linebuf);
1366
1367 png_write_end(png_ptr, NULL);
1368
1369 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1370 png_free(png_ptr, png_palette);
1371 }
1372
1373 png_destroy_write_struct(&png_ptr, &info_ptr);
1374
1375 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1376
1377 tight_send_compact_size(vs, vs->tight->png.offset);
1378 vnc_write(vs, vs->tight->png.buffer, vs->tight->png.offset);
1379 buffer_reset(&vs->tight->png);
1380 return 1;
1381 }
1382 #endif /* CONFIG_VNC_PNG */
1383
1384 static void vnc_tight_start(VncState *vs)
1385 {
1386 buffer_reset(&vs->tight->tight);
1387
1388 // make the output buffer be the zlib buffer, so we can compress it later
1389 vs->tight->tmp = vs->output;
1390 vs->output = vs->tight->tight;
1391 }
1392
1393 static void vnc_tight_stop(VncState *vs)
1394 {
1395 // switch back to normal output/zlib buffers
1396 vs->tight->tight = vs->output;
1397 vs->output = vs->tight->tmp;
1398 }
1399
1400 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1401 int bg, int fg, int colors, VncPalette *palette)
1402 {
1403 int ret;
1404
1405 if (colors == 0) {
1406 if (tight_detect_smooth_image(vs, w, h)) {
1407 ret = send_gradient_rect(vs, x, y, w, h);
1408 } else {
1409 ret = send_full_color_rect(vs, x, y, w, h);
1410 }
1411 } else if (colors == 1) {
1412 ret = send_solid_rect(vs);
1413 } else if (colors == 2) {
1414 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1415 } else if (colors <= 256) {
1416 ret = send_palette_rect(vs, x, y, w, h, palette);
1417 } else {
1418 ret = 0;
1419 }
1420 return ret;
1421 }
1422
1423 #ifdef CONFIG_VNC_JPEG
1424 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1425 int bg, int fg, int colors,
1426 VncPalette *palette, bool force)
1427 {
1428 int ret;
1429
1430 if (colors == 0) {
1431 if (force || (tight_jpeg_conf[vs->tight->quality].jpeg_full &&
1432 tight_detect_smooth_image(vs, w, h))) {
1433 int quality = tight_conf[vs->tight->quality].jpeg_quality;
1434
1435 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1436 } else {
1437 ret = send_full_color_rect(vs, x, y, w, h);
1438 }
1439 } else if (colors == 1) {
1440 ret = send_solid_rect(vs);
1441 } else if (colors == 2) {
1442 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1443 } else if (colors <= 256) {
1444 if (force || (colors > 96 &&
1445 tight_jpeg_conf[vs->tight->quality].jpeg_idx &&
1446 tight_detect_smooth_image(vs, w, h))) {
1447 int quality = tight_conf[vs->tight->quality].jpeg_quality;
1448
1449 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1450 } else {
1451 ret = send_palette_rect(vs, x, y, w, h, palette);
1452 }
1453 } else {
1454 ret = 0;
1455 }
1456 return ret;
1457 }
1458 #endif
1459
1460 static __thread VncPalette *color_count_palette;
1461 static __thread Notifier vnc_tight_cleanup_notifier;
1462
1463 static void vnc_tight_cleanup(Notifier *n, void *value)
1464 {
1465 g_free(color_count_palette);
1466 color_count_palette = NULL;
1467 }
1468
1469 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1470 {
1471 uint32_t bg = 0, fg = 0;
1472 int colors;
1473 int ret = 0;
1474 #ifdef CONFIG_VNC_JPEG
1475 bool force_jpeg = false;
1476 bool allow_jpeg = true;
1477 #endif
1478
1479 if (!color_count_palette) {
1480 color_count_palette = g_malloc(sizeof(VncPalette));
1481 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup;
1482 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier);
1483 }
1484
1485 vnc_framebuffer_update(vs, x, y, w, h, vs->tight->type);
1486
1487 vnc_tight_start(vs);
1488 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1489 vnc_tight_stop(vs);
1490
1491 #ifdef CONFIG_VNC_JPEG
1492 if (!vs->vd->non_adaptive && vs->tight->quality != (uint8_t)-1) {
1493 double freq = vnc_update_freq(vs, x, y, w, h);
1494
1495 if (freq < tight_jpeg_conf[vs->tight->quality].jpeg_freq_min) {
1496 allow_jpeg = false;
1497 }
1498 if (freq >= tight_jpeg_conf[vs->tight->quality].jpeg_freq_threshold) {
1499 force_jpeg = true;
1500 vnc_sent_lossy_rect(vs, x, y, w, h);
1501 }
1502 }
1503 #endif
1504
1505 colors = tight_fill_palette(vs, x, y, w * h, &bg, &fg, color_count_palette);
1506
1507 #ifdef CONFIG_VNC_JPEG
1508 if (allow_jpeg && vs->tight->quality != (uint8_t)-1) {
1509 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors,
1510 color_count_palette, force_jpeg);
1511 } else {
1512 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1513 color_count_palette);
1514 }
1515 #else
1516 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1517 color_count_palette);
1518 #endif
1519
1520 return ret;
1521 }
1522
1523 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1524 {
1525 vnc_framebuffer_update(vs, x, y, w, h, vs->tight->type);
1526
1527 vnc_tight_start(vs);
1528 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1529 vnc_tight_stop(vs);
1530
1531 return send_solid_rect(vs);
1532 }
1533
1534 static int send_rect_simple(VncState *vs, int x, int y, int w, int h,
1535 bool split)
1536 {
1537 int max_size, max_width;
1538 int max_sub_width, max_sub_height;
1539 int dx, dy;
1540 int rw, rh;
1541 int n = 0;
1542
1543 max_size = tight_conf[vs->tight->compression].max_rect_size;
1544 max_width = tight_conf[vs->tight->compression].max_rect_width;
1545
1546 if (split && (w > max_width || w * h > max_size)) {
1547 max_sub_width = (w > max_width) ? max_width : w;
1548 max_sub_height = max_size / max_sub_width;
1549
1550 for (dy = 0; dy < h; dy += max_sub_height) {
1551 for (dx = 0; dx < w; dx += max_width) {
1552 rw = MIN(max_sub_width, w - dx);
1553 rh = MIN(max_sub_height, h - dy);
1554 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1555 }
1556 }
1557 } else {
1558 n += send_sub_rect(vs, x, y, w, h);
1559 }
1560
1561 return n;
1562 }
1563
1564 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1565 int w, int h, int max_rows)
1566 {
1567 int dx, dy, dw, dh;
1568 int n = 0;
1569
1570 /* Try to find large solid-color areas and send them separately. */
1571
1572 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1573
1574 /* If a rectangle becomes too large, send its upper part now. */
1575
1576 if (dy - y >= max_rows) {
1577 n += send_rect_simple(vs, x, y, w, max_rows, true);
1578 y += max_rows;
1579 h -= max_rows;
1580 }
1581
1582 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1583
1584 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1585 uint32_t color_value;
1586 int x_best, y_best, w_best, h_best;
1587
1588 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1589
1590 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1591 continue ;
1592 }
1593
1594 /* Get dimensions of solid-color area. */
1595
1596 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1597 color_value, &w_best, &h_best);
1598
1599 /* Make sure a solid rectangle is large enough
1600 (or the whole rectangle is of the same color). */
1601
1602 if (w_best * h_best != w * h &&
1603 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1604 continue;
1605 }
1606
1607 /* Try to extend solid rectangle to maximum size. */
1608
1609 x_best = dx; y_best = dy;
1610 extend_solid_area(vs, x, y, w, h, color_value,
1611 &x_best, &y_best, &w_best, &h_best);
1612
1613 /* Send rectangles at top and left to solid-color area. */
1614
1615 if (y_best != y) {
1616 n += send_rect_simple(vs, x, y, w, y_best-y, true);
1617 }
1618 if (x_best != x) {
1619 n += tight_send_framebuffer_update(vs, x, y_best,
1620 x_best-x, h_best);
1621 }
1622
1623 /* Send solid-color rectangle. */
1624 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1625
1626 /* Send remaining rectangles (at right and bottom). */
1627
1628 if (x_best + w_best != x + w) {
1629 n += tight_send_framebuffer_update(vs, x_best+w_best,
1630 y_best,
1631 w-(x_best-x)-w_best,
1632 h_best);
1633 }
1634 if (y_best + h_best != y + h) {
1635 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1636 w, h-(y_best-y)-h_best);
1637 }
1638
1639 /* Return after all recursive calls are done. */
1640 return n;
1641 }
1642 }
1643 return n + send_rect_simple(vs, x, y, w, h, true);
1644 }
1645
1646 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1647 int w, int h)
1648 {
1649 int max_rows;
1650
1651 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF &&
1652 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) {
1653 vs->tight->pixel24 = true;
1654 } else {
1655 vs->tight->pixel24 = false;
1656 }
1657
1658 #ifdef CONFIG_VNC_JPEG
1659 if (vs->tight->quality != (uint8_t)-1) {
1660 double freq = vnc_update_freq(vs, x, y, w, h);
1661
1662 if (freq > tight_jpeg_conf[vs->tight->quality].jpeg_freq_threshold) {
1663 return send_rect_simple(vs, x, y, w, h, false);
1664 }
1665 }
1666 #endif
1667
1668 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1669 return send_rect_simple(vs, x, y, w, h, true);
1670 }
1671
1672 /* Calculate maximum number of rows in one non-solid rectangle. */
1673
1674 max_rows = tight_conf[vs->tight->compression].max_rect_size;
1675 max_rows /= MIN(tight_conf[vs->tight->compression].max_rect_width, w);
1676
1677 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1678 }
1679
1680 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1681 int w, int h)
1682 {
1683 vs->tight->type = VNC_ENCODING_TIGHT;
1684 return tight_send_framebuffer_update(vs, x, y, w, h);
1685 }
1686
1687 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1688 int w, int h)
1689 {
1690 vs->tight->type = VNC_ENCODING_TIGHT_PNG;
1691 return tight_send_framebuffer_update(vs, x, y, w, h);
1692 }
1693
1694 void vnc_tight_clear(VncState *vs)
1695 {
1696 int i;
1697 for (i = 0; i < ARRAY_SIZE(vs->tight->stream); i++) {
1698 if (vs->tight->stream[i].opaque) {
1699 deflateEnd(&vs->tight->stream[i]);
1700 }
1701 }
1702
1703 buffer_free(&vs->tight->tight);
1704 buffer_free(&vs->tight->zlib);
1705 buffer_free(&vs->tight->gradient);
1706 #ifdef CONFIG_VNC_JPEG
1707 buffer_free(&vs->tight->jpeg);
1708 #endif
1709 #ifdef CONFIG_VNC_PNG
1710 buffer_free(&vs->tight->png);
1711 #endif
1712 }
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