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vnc: tight: add JPEG and gradient subencoding with smooth image detection
[qemu.git] / vnc-encoding-tight.c
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380282b0
CC		 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
2f6f5c7a
CC		 29#include "qemu-common.h"
30
31#ifdef CONFIG_VNC_JPEG
32#include <stdio.h>
33#include <jpeglib.h>
34#endif
35
36#include "bswap.h"
aa7d73fd
CC		 37#include "qdict.h"
38#include "qint.h"
380282b0
CC		 39#include "vnc.h"
40#include "vnc-encoding-tight.h"
41
42/* Compression level stuff. The following array contains various
43 encoder parameters for each of 10 compression levels (0..9).
44 Last three parameters correspond to JPEG quality levels (0..9). */
45
46static const struct {
47 int max_rect_size, max_rect_width;
48 int mono_min_rect_size, gradient_min_rect_size;
49 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
50 int gradient_threshold, gradient_threshold24;
51 int idx_max_colors_divisor;
52 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
53} tight_conf[] = {
54 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
55 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
56 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
57 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
58 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
59 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
60 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
61 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
62 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
63 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
64};
65
2f6f5c7a
CC		 66/*
67 * Code to guess if given rectangle is suitable for smooth image
68 * compression (by applying "gradient" filter or JPEG coder).
69 */
70
71static uint
72tight_detect_smooth_image24(VncState *vs, int w, int h)
73{
74 int off;
75 int x, y, d, dx;
76 uint c;
77 uint stats[256];
78 int pixels = 0;
79 int pix, left[3];
80 uint errors;
81 unsigned char *buf = vs->tight.buffer;
82
83 /*
84 * If client is big-endian, color samples begin from the second
85 * byte (offset 1) of a 32-bit pixel value.
86 */
87 off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG);
88
89 memset(stats, 0, sizeof (stats));
90
91 for (y = 0, x = 0; y < h && x < w;) {
92 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
93 d++) {
94 for (c = 0; c < 3; c++) {
95 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
96 }
97 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
98 for (c = 0; c < 3; c++) {
99 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
100 stats[abs(pix - left[c])]++;
101 left[c] = pix;
102 }
103 pixels++;
104 }
105 }
106 if (w > h) {
107 x += h;
108 y = 0;
109 } else {
110 x = 0;
111 y += w;
112 }
113 }
114
115 /* 95% smooth or more ... */
116 if (stats[0] * 33 / pixels >= 95) {
117 return 0;
118 }
119
120 errors = 0;
121 for (c = 1; c < 8; c++) {
122 errors += stats[c] * (c * c);
123 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
124 return 0;
125 }
126 }
127 for (; c < 256; c++) {
128 errors += stats[c] * (c * c);
129 }
130 errors /= (pixels * 3 - stats[0]);
131
132 return errors;
133}
134
135#define DEFINE_DETECT_FUNCTION(bpp) \
136 \
137 static uint \
138 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
139 bool endian; \
140 uint##bpp##_t pix; \
141 int max[3], shift[3]; \
142 int x, y, d, dx; \
143 uint c; \
144 uint stats[256]; \
145 int pixels = 0; \
146 int sample, sum, left[3]; \
147 uint errors; \
148 unsigned char *buf = vs->tight.buffer; \
149 \
150 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
151 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
152 \
153 \
154 max[0] = vs->clientds.pf.rmax; \
155 max[1] = vs->clientds.pf.gmax; \
156 max[2] = vs->clientds.pf.bmax; \
157 shift[0] = vs->clientds.pf.rshift; \
158 shift[1] = vs->clientds.pf.gshift; \
159 shift[2] = vs->clientds.pf.bshift; \
160 \
161 memset(stats, 0, sizeof(stats)); \
162 \
163 y = 0, x = 0; \
164 while (y < h && x < w) { \
165 for (d = 0; d < h - y && \
166 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
167 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
168 if (endian) { \
169 pix = bswap_##bpp(pix); \
170 } \
171 for (c = 0; c < 3; c++) { \
172 left[c] = (int)(pix >> shift[c] & max[c]); \
173 } \
174 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
175 dx++) { \
176 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
177 if (endian) { \
178 pix = bswap_##bpp(pix); \
179 } \
180 sum = 0; \
181 for (c = 0; c < 3; c++) { \
182 sample = (int)(pix >> shift[c] & max[c]); \
183 sum += abs(sample - left[c]); \
184 left[c] = sample; \
185 } \
186 if (sum > 255) { \
187 sum = 255; \
188 } \
189 stats[sum]++; \
190 pixels++; \
191 } \
192 } \
193 if (w > h) { \
194 x += h; \
195 y = 0; \
196 } else { \
197 x = 0; \
198 y += w; \
199 } \
200 } \
201 \
202 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
203 return 0; \
204 } \
205 \
206 errors = 0; \
207 for (c = 1; c < 8; c++) { \
208 errors += stats[c] * (c * c); \
209 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
210 return 0; \
211 } \
212 } \
213 for (; c < 256; c++) { \
214 errors += stats[c] * (c * c); \
215 } \
216 errors /= (pixels - stats[0]); \
217 \
218 return errors; \
219 }
220
221DEFINE_DETECT_FUNCTION(16)
222DEFINE_DETECT_FUNCTION(32)
223
224static int
225tight_detect_smooth_image(VncState *vs, int w, int h)
226{
227 uint errors;
228 int compression = vs->tight_compression;
229 int quality = vs->tight_quality;
230
231 if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
232 vs->clientds.pf.bytes_per_pixel == 1 ||
233 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
234 return 0;
235 }
236
237 if (vs->tight_quality != -1) {
238 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
239 return 0;
240 }
241 } else {
242 if (w * h < tight_conf[compression].gradient_min_rect_size) {
243 return 0;
244 }
245 }
246
247 if (vs->clientds.pf.bytes_per_pixel == 4) {
248 if (vs->tight_pixel24) {
249 errors = tight_detect_smooth_image24(vs, w, h);
250 if (vs->tight_quality != -1) {
251 return (errors < tight_conf[quality].jpeg_threshold24);
252 }
253 return (errors < tight_conf[compression].gradient_threshold24);
254 } else {
255 errors = tight_detect_smooth_image32(vs, w, h);
256 }
257 } else {
258 errors = tight_detect_smooth_image16(vs, w, h);
259 }
260 if (quality != -1) {
261 return (errors < tight_conf[quality].jpeg_threshold);
262 }
263 return (errors < tight_conf[compression].gradient_threshold);
264}
265
aa7d73fd
CC		 266/*
267 * Code to determine how many different colors used in rectangle.
268 */
269
270static void tight_palette_rgb2buf(uint32_t rgb, int bpp, uint8_t buf[6])
271{
272 memset(buf, 0, 6);
273
274 if (bpp == 32) {
275 buf[0] = ((rgb >> 24) & 0xFF);
276 buf[1] = ((rgb >> 16) & 0xFF);
277 buf[2] = ((rgb >> 8) & 0xFF);
278 buf[3] = ((rgb >> 0) & 0xFF);
279 buf[4] = ((buf[0] & 1) == 0) << 3 | ((buf[1] & 1) == 0) << 2;
280 buf[4]|= ((buf[2] & 1) == 0) << 1 | ((buf[3] & 1) == 0) << 0;
281 buf[0] |= 1;
282 buf[1] |= 1;
283 buf[2] |= 1;
284 buf[3] |= 1;
285 }
286 if (bpp == 16) {
287 buf[0] = ((rgb >> 8) & 0xFF);
288 buf[1] = ((rgb >> 0) & 0xFF);
289 buf[2] = ((buf[0] & 1) == 0) << 1 | ((buf[1] & 1) == 0) << 0;
290 buf[0] |= 1;
291 buf[1] |= 1;
292 }
293}
294
295static uint32_t tight_palette_buf2rgb(int bpp, const uint8_t *buf)
296{
297 uint32_t rgb = 0;
298
299 if (bpp == 32) {
300 rgb |= ((buf[0] & ~1) | !((buf[4] >> 3) & 1)) << 24;
301 rgb |= ((buf[1] & ~1) | !((buf[4] >> 2) & 1)) << 16;
302 rgb |= ((buf[2] & ~1) | !((buf[4] >> 1) & 1)) << 8;
303 rgb |= ((buf[3] & ~1) | !((buf[4] >> 0) & 1)) << 0;
304 }
305 if (bpp == 16) {
306 rgb |= ((buf[0] & ~1) | !((buf[2] >> 1) & 1)) << 8;
307 rgb |= ((buf[1] & ~1) | !((buf[2] >> 0) & 1)) << 0;
308 }
309 return rgb;
310}
311
312
313static int tight_palette_insert(QDict *palette, uint32_t rgb, int bpp, int max)
314{
315 uint8_t key[6];
316 int idx = qdict_size(palette);
317 bool present;
318
319 tight_palette_rgb2buf(rgb, bpp, key);
320 present = qdict_haskey(palette, (char *)key);
321 if (idx >= max && !present) {
322 return 0;
323 }
324 if (!present) {
325 qdict_put(palette, (char *)key, qint_from_int(idx));
326 }
327 return qdict_size(palette);
328}
329
330#define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
331 \
332 static int \
333 tight_fill_palette##bpp(VncState *vs, int x, int y, \
334 int max, size_t count, \
335 uint32_t *bg, uint32_t *fg, \
336 struct QDict **palette) { \
337 uint##bpp##_t *data; \
338 uint##bpp##_t c0, c1, ci; \
339 int i, n0, n1; \
340 \
341 data = (uint##bpp##_t *)vs->tight.buffer; \
342 \
343 c0 = data[0]; \
344 i = 1; \
345 while (i < count && data[i] == c0) \
346 i++; \
347 if (i >= count) { \
348 *bg = *fg = c0; \
349 return 1; \
350 } \
351 \
352 if (max < 2) { \
353 return 0; \
354 } \
355 \
356 n0 = i; \
357 c1 = data[i]; \
358 n1 = 0; \
359 for (i++; i < count; i++) { \
360 ci = data[i]; \
361 if (ci == c0) { \
362 n0++; \
363 } else if (ci == c1) { \
364 n1++; \
365 } else \
366 break; \
367 } \
368 if (i >= count) { \
369 if (n0 > n1) { \
370 *bg = (uint32_t)c0; \
371 *fg = (uint32_t)c1; \
372 } else { \
373 *bg = (uint32_t)c1; \
374 *fg = (uint32_t)c0; \
375 } \
376 return 2; \
377 } \
378 \
379 if (max == 2) { \
380 return 0; \
381 } \
382 \
383 *palette = qdict_new(); \
384 tight_palette_insert(*palette, c0, bpp, max); \
385 tight_palette_insert(*palette, c1, bpp, max); \
270ec219 386 tight_palette_insert(*palette, ci, bpp, max); \
aa7d73fd
CC		 387 \
388 for (i++; i < count; i++) { \
389 if (data[i] == ci) { \
390 continue; \
391 } else { \
392 if (!tight_palette_insert(*palette, (uint32_t)ci, \
393 bpp, max)) { \
394 return 0; \
395 } \
396 ci = data[i]; \
397 } \
398 } \
399 \
400 return qdict_size(*palette); \
401 }
402
403DEFINE_FILL_PALETTE_FUNCTION(8)
404DEFINE_FILL_PALETTE_FUNCTION(16)
405DEFINE_FILL_PALETTE_FUNCTION(32)
406
407static int tight_fill_palette(VncState *vs, int x, int y,
408 size_t count, uint32_t *bg, uint32_t *fg,
409 struct QDict **palette)
410{
411 int max;
412
413 max = count / tight_conf[vs->tight_compression].idx_max_colors_divisor;
414 if (max < 2 &&
415 count >= tight_conf[vs->tight_compression].mono_min_rect_size) {
416 max = 2;
417 }
418 if (max >= 256) {
419 max = 256;
420 }
421
422 switch(vs->clientds.pf.bytes_per_pixel) {
423 case 4:
424 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
425 case 2:
426 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
427 default:
428 max = 2;
429 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
430 }
431 return 0;
432}
433
434/* Callback to dump a palette with qdict_iter
435static void print_palette(const char *key, QObject *obj, void *opaque)
436{
437 uint8_t idx = qint_get_int(qobject_to_qint(obj));
438 uint32_t rgb = tight_palette_buf2rgb(32, (uint8_t *)key);
439
440 fprintf(stderr, "%.2x ", (unsigned char)*key);
441 while (*key++)
442 fprintf(stderr, "%.2x ", (unsigned char)*key);
443
444 fprintf(stderr, ": idx: %x rgb: %x\n", idx, rgb);
445}
446*/
447
448/*
449 * Converting truecolor samples into palette indices.
450 */
451#define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
452 \
453 static void \
454 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
455 struct QDict *palette) { \
456 uint##bpp##_t *src; \
457 uint##bpp##_t rgb; \
458 uint8_t key[6]; \
54d43eac 459 int i, rep; \
aa7d73fd
CC		 460 uint8_t idx; \
461 \
462 src = (uint##bpp##_t *) buf; \
463 \
54d43eac 464 for (i = 0; i < count; i++) { \
aa7d73fd
CC		 465 rgb = *src++; \
466 rep = 0; \
54d43eac
CC		 467 while (i < count && *src == rgb) { \
468 rep++, src++, i++; \
aa7d73fd
CC		 469 } \
470 tight_palette_rgb2buf(rgb, bpp, key); \
471 if (!qdict_haskey(palette, (char *)key)) { \
472 /* \
473 * Should never happen, but don't break everything \
474 * if it does, use the first color instead \
475 */ \
476 idx = 0; \
477 } else { \
478 idx = qdict_get_int(palette, (char *)key); \
479 } \
480 while (rep >= 0) { \
481 *buf++ = idx; \
482 rep--; \
483 } \
484 } \
485 }
486
487DEFINE_IDX_ENCODE_FUNCTION(16)
488DEFINE_IDX_ENCODE_FUNCTION(32)
489
490#define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
491 \
492 static void \
493 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
494 uint##bpp##_t bg, uint##bpp##_t fg) { \
495 uint##bpp##_t *ptr; \
496 unsigned int value, mask; \
497 int aligned_width; \
498 int x, y, bg_bits; \
499 \
500 ptr = (uint##bpp##_t *) buf; \
501 aligned_width = w - w % 8; \
502 \
503 for (y = 0; y < h; y++) { \
504 for (x = 0; x < aligned_width; x += 8) { \
505 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
506 if (*ptr++ != bg) { \
507 break; \
508 } \
509 } \
510 if (bg_bits == 8) { \
511 *buf++ = 0; \
512 continue; \
513 } \
514 mask = 0x80 >> bg_bits; \
515 value = mask; \
516 for (bg_bits++; bg_bits < 8; bg_bits++) { \
517 mask >>= 1; \
518 if (*ptr++ != bg) { \
519 value |= mask; \
520 } \
521 } \
522 *buf++ = (uint8_t)value; \
523 } \
524 \
525 mask = 0x80; \
526 value = 0; \
527 if (x >= w) { \
528 continue; \
529 } \
530 \
531 for (; x < w; x++) { \
532 if (*ptr++ != bg) { \
533 value |= mask; \
534 } \
535 mask >>= 1; \
536 } \
537 *buf++ = (uint8_t)value; \
538 } \
539 }
540
541DEFINE_MONO_ENCODE_FUNCTION(8)
542DEFINE_MONO_ENCODE_FUNCTION(16)
543DEFINE_MONO_ENCODE_FUNCTION(32)
544
2f6f5c7a
CC		 545/*
546 * ``Gradient'' filter for 24-bit color samples.
547 * Should be called only when redMax, greenMax and blueMax are 255.
548 * Color components assumed to be byte-aligned.
549 */
550
551static void
552tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
553{
554 uint32_t *buf32;
555 uint32_t pix32;
556 int shift[3];
557 int *prev;
558 int here[3], upper[3], left[3], upperleft[3];
559 int prediction;
560 int x, y, c;
561
562 buf32 = (uint32_t *)buf;
563 memset(vs->tight_gradient.buffer, 0, w * 3 * sizeof(int));
564
565 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
566 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
567 shift[0] = vs->clientds.pf.rshift;
568 shift[1] = vs->clientds.pf.gshift;
569 shift[2] = vs->clientds.pf.bshift;
570 } else {
571 shift[0] = 24 - vs->clientds.pf.rshift;
572 shift[1] = 24 - vs->clientds.pf.gshift;
573 shift[2] = 24 - vs->clientds.pf.bshift;
574 }
575
576 for (y = 0; y < h; y++) {
577 for (c = 0; c < 3; c++) {
578 upper[c] = 0;
579 here[c] = 0;
580 }
581 prev = (int *)vs->tight_gradient.buffer;
582 for (x = 0; x < w; x++) {
583 pix32 = *buf32++;
584 for (c = 0; c < 3; c++) {
585 upperleft[c] = upper[c];
586 left[c] = here[c];
587 upper[c] = *prev;
588 here[c] = (int)(pix32 >> shift[c] & 0xFF);
589 *prev++ = here[c];
590
591 prediction = left[c] + upper[c] - upperleft[c];
592 if (prediction < 0) {
593 prediction = 0;
594 } else if (prediction > 0xFF) {
595 prediction = 0xFF;
596 }
597 *buf++ = (char)(here[c] - prediction);
598 }
599 }
600 }
601}
602
603
604/*
605 * ``Gradient'' filter for other color depths.
606 */
607
608#define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
609 \
610 static void \
611 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
612 int w, int h) { \
613 uint##bpp##_t pix, diff; \
614 bool endian; \
615 int *prev; \
616 int max[3], shift[3]; \
617 int here[3], upper[3], left[3], upperleft[3]; \
618 int prediction; \
619 int x, y, c; \
620 \
621 memset (vs->tight_gradient.buffer, 0, w * 3 * sizeof(int)); \
622 \
623 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \
624 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \
625 \
626 max[0] = vs->clientds.pf.rmax; \
627 max[1] = vs->clientds.pf.gmax; \
628 max[2] = vs->clientds.pf.bmax; \
629 shift[0] = vs->clientds.pf.rshift; \
630 shift[1] = vs->clientds.pf.gshift; \
631 shift[2] = vs->clientds.pf.bshift; \
632 \
633 for (y = 0; y < h; y++) { \
634 for (c = 0; c < 3; c++) { \
635 upper[c] = 0; \
636 here[c] = 0; \
637 } \
638 prev = (int *)vs->tight_gradient.buffer; \
639 for (x = 0; x < w; x++) { \
640 pix = *buf; \
641 if (endian) { \
642 pix = bswap_##bpp(pix); \
643 } \
644 diff = 0; \
645 for (c = 0; c < 3; c++) { \
646 upperleft[c] = upper[c]; \
647 left[c] = here[c]; \
648 upper[c] = *prev; \
649 here[c] = (int)(pix >> shift[c] & max[c]); \
650 *prev++ = here[c]; \
651 \
652 prediction = left[c] + upper[c] - upperleft[c]; \
653 if (prediction < 0) { \
654 prediction = 0; \
655 } else if (prediction > max[c]) { \
656 prediction = max[c]; \
657 } \
658 diff |= ((here[c] - prediction) & max[c]) \
659 << shift[c]; \
660 } \
661 if (endian) { \
662 diff = bswap_##bpp(diff); \
663 } \
664 *buf++ = diff; \
665 } \
666 } \
667 }
668
669DEFINE_GRADIENT_FILTER_FUNCTION(16)
670DEFINE_GRADIENT_FILTER_FUNCTION(32)
671
b4bea3f2
CC		 672/*
673 * Check if a rectangle is all of the same color. If needSameColor is
674 * set to non-zero, then also check that its color equals to the
675 * *colorPtr value. The result is 1 if the test is successfull, and in
676 * that case new color will be stored in *colorPtr.
677 */
678
679#define DEFINE_CHECK_SOLID_FUNCTION(bpp) \
680 \
681 static bool \
682 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \
683 uint32_t* color, bool samecolor) \
684 { \
685 VncDisplay *vd = vs->vd; \
686 uint##bpp##_t *fbptr; \
687 uint##bpp##_t c; \
688 int dx, dy; \
689 \
690 fbptr = (uint##bpp##_t *) \
691 (vd->server->data + y * ds_get_linesize(vs->ds) + \
692 x * ds_get_bytes_per_pixel(vs->ds)); \
693 \
694 c = *fbptr; \
695 if (samecolor && (uint32_t)c != *color) { \
696 return false; \
697 } \
698 \
699 for (dy = 0; dy < h; dy++) { \
700 for (dx = 0; dx < w; dx++) { \
701 if (c != fbptr[dx]) { \
702 return false; \
703 } \
704 } \
705 fbptr = (uint##bpp##_t *) \
706 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \
707 } \
708 \
709 *color = (uint32_t)c; \
710 return true; \
711 }
712
713DEFINE_CHECK_SOLID_FUNCTION(32)
714DEFINE_CHECK_SOLID_FUNCTION(16)
715DEFINE_CHECK_SOLID_FUNCTION(8)
716
717static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
718 uint32_t* color, bool samecolor)
719{
720 VncDisplay *vd = vs->vd;
721
722 switch(vd->server->pf.bytes_per_pixel) {
723 case 4:
724 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
725 case 2:
726 return check_solid_tile16(vs, x, y, w, h, color, samecolor);
727 default:
728 return check_solid_tile8(vs, x, y, w, h, color, samecolor);
729 }
730}
731
732static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
733 uint32_t color, int *w_ptr, int *h_ptr)
734{
735 int dx, dy, dw, dh;
736 int w_prev;
737 int w_best = 0, h_best = 0;
738
739 w_prev = w;
740
741 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
742
743 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
744 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
745
746 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
747 break;
748 }
749
750 for (dx = x + dw; dx < x + w_prev;) {
751 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
752
753 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
754 break;
755 }
756 dx += dw;
757 }
758
759 w_prev = dx - x;
760 if (w_prev * (dy + dh - y) > w_best * h_best) {
761 w_best = w_prev;
762 h_best = dy + dh - y;
763 }
764 }
765
766 *w_ptr = w_best;
767 *h_ptr = h_best;
768}
769
770static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
771 uint32_t color, int *x_ptr, int *y_ptr,
772 int *w_ptr, int *h_ptr)
773{
774 int cx, cy;
775
776 /* Try to extend the area upwards. */
777 for ( cy = *y_ptr - 1;
778 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
779 cy-- );
780 *h_ptr += *y_ptr - (cy + 1);
781 *y_ptr = cy + 1;
782
783 /* ... downwards. */
784 for ( cy = *y_ptr + *h_ptr;
785 cy < y + h &&
786 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
787 cy++ );
788 *h_ptr += cy - (*y_ptr + *h_ptr);
789
790 /* ... to the left. */
791 for ( cx = *x_ptr - 1;
792 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
793 cx-- );
794 *w_ptr += *x_ptr - (cx + 1);
795 *x_ptr = cx + 1;
796
797 /* ... to the right. */
798 for ( cx = *x_ptr + *w_ptr;
799 cx < x + w &&
800 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
801 cx++ );
802 *w_ptr += cx - (*x_ptr + *w_ptr);
803}
804
380282b0
CC		 805static int tight_init_stream(VncState *vs, int stream_id,
806 int level, int strategy)
807{
808 z_streamp zstream = &vs->tight_stream[stream_id];
809
810 if (zstream->opaque == NULL) {
811 int err;
812
813 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
814 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
815 zstream->zalloc = vnc_zlib_zalloc;
816 zstream->zfree = vnc_zlib_zfree;
817
818 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
819 MAX_MEM_LEVEL, strategy);
820
821 if (err != Z_OK) {
822 fprintf(stderr, "VNC: error initializing zlib\n");
823 return -1;
824 }
825
826 vs->tight_levels[stream_id] = level;
827 zstream->opaque = vs;
828 }
829
830 if (vs->tight_levels[stream_id] != level) {
831 if (deflateParams(zstream, level, strategy) != Z_OK) {
832 return -1;
833 }
834 vs->tight_levels[stream_id] = level;
835 }
836 return 0;
837}
838
839static void tight_send_compact_size(VncState *vs, size_t len)
840{
841 int lpc = 0;
842 int bytes = 0;
843 char buf[3] = {0, 0, 0};
844
845 buf[bytes++] = len & 0x7F;
846 if (len > 0x7F) {
847 buf[bytes-1] |= 0x80;
848 buf[bytes++] = (len >> 7) & 0x7F;
849 if (len > 0x3FFF) {
850 buf[bytes-1] |= 0x80;
851 buf[bytes++] = (len >> 14) & 0xFF;
852 }
853 }
b4bea3f2 854 for (lpc = 0; lpc < bytes; lpc++) {
380282b0
CC		 855 vnc_write_u8(vs, buf[lpc]);
856 }
857}
858
859static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
860 int level, int strategy)
861{
862 z_streamp zstream = &vs->tight_stream[stream_id];
863 int previous_out;
864
865 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
866 vnc_write(vs, vs->tight.buffer, vs->tight.offset);
867 return bytes;
868 }
869
870 if (tight_init_stream(vs, stream_id, level, strategy)) {
871 return -1;
872 }
873
874 /* reserve memory in output buffer */
875 buffer_reserve(&vs->tight_zlib, bytes + 64);
876
877 /* set pointers */
878 zstream->next_in = vs->tight.buffer;
879 zstream->avail_in = vs->tight.offset;
880 zstream->next_out = vs->tight_zlib.buffer + vs->tight_zlib.offset;
881 zstream->avail_out = vs->tight_zlib.capacity - vs->tight_zlib.offset;
882 zstream->data_type = Z_BINARY;
883 previous_out = zstream->total_out;
884
885 /* start encoding */
886 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
887 fprintf(stderr, "VNC: error during tight compression\n");
888 return -1;
889 }
890
891 vs->tight_zlib.offset = vs->tight_zlib.capacity - zstream->avail_out;
892 bytes = zstream->total_out - previous_out;
893
894 tight_send_compact_size(vs, bytes);
895 vnc_write(vs, vs->tight_zlib.buffer, bytes);
896
897 buffer_reset(&vs->tight_zlib);
898
899 return bytes;
900}
901
902/*
903 * Subencoding implementations.
904 */
aa7d73fd 905static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
380282b0 906{
380282b0
CC		 907 uint32_t *buf32;
908 uint32_t pix;
909 int rshift, gshift, bshift;
910
380282b0
CC		 911 buf32 = (uint32_t *)buf;
912
913 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
914 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
915 rshift = vs->clientds.pf.rshift;
916 gshift = vs->clientds.pf.gshift;
917 bshift = vs->clientds.pf.bshift;
918 } else {
919 rshift = 24 - vs->clientds.pf.rshift;
920 gshift = 24 - vs->clientds.pf.gshift;
921 bshift = 24 - vs->clientds.pf.bshift;
922 }
923
aa7d73fd
CC		 924 if (ret) {
925 *ret = count * 3;
926 }
380282b0
CC		 927
928 while (count--) {
929 pix = *buf32++;
930 *buf++ = (char)(pix >> rshift);
931 *buf++ = (char)(pix >> gshift);
932 *buf++ = (char)(pix >> bshift);
933 }
934}
935
936static int send_full_color_rect(VncState *vs, int w, int h)
937{
938 int stream = 0;
939 size_t bytes;
940
941 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
942
943 if (vs->tight_pixel24) {
aa7d73fd 944 tight_pack24(vs, vs->tight.buffer, w * h, &vs->tight.offset);
380282b0
CC		 945 bytes = 3;
946 } else {
947 bytes = vs->clientds.pf.bytes_per_pixel;
948 }
949
950 bytes = tight_compress_data(vs, stream, w * h * bytes,
951 tight_conf[vs->tight_compression].raw_zlib_level,
952 Z_DEFAULT_STRATEGY);
953
954 return (bytes >= 0);
955}
956
b4bea3f2
CC		 957static int send_solid_rect(VncState *vs)
958{
959 size_t bytes;
960
961 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
962
963 if (vs->tight_pixel24) {
aa7d73fd 964 tight_pack24(vs, vs->tight.buffer, 1, &vs->tight.offset);
b4bea3f2
CC		 965 bytes = 3;
966 } else {
967 bytes = vs->clientds.pf.bytes_per_pixel;
968 }
969
970 vnc_write(vs, vs->tight.buffer, bytes);
971 return 1;
972}
973
aa7d73fd
CC		 974static int send_mono_rect(VncState *vs, int w, int h, uint32_t bg, uint32_t fg)
975{
976 size_t bytes;
977 int stream = 1;
978 int level = tight_conf[vs->tight_compression].mono_zlib_level;
979
980 bytes = ((w + 7) / 8) * h;
981
982 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
983 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
984 vnc_write_u8(vs, 1);
985
986 switch(vs->clientds.pf.bytes_per_pixel) {
987 case 4:
988 {
989 uint32_t buf[2] = {bg, fg};
990 size_t ret = sizeof (buf);
991
992 if (vs->tight_pixel24) {
993 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
994 }
995 vnc_write(vs, buf, ret);
996
997 tight_encode_mono_rect32(vs->tight.buffer, w, h, bg, fg);
998 break;
999 }
1000 case 2:
1001 vnc_write(vs, &bg, 2);
1002 vnc_write(vs, &fg, 2);
1003 tight_encode_mono_rect16(vs->tight.buffer, w, h, bg, fg);
1004 break;
1005 default:
1006 vnc_write_u8(vs, bg);
1007 vnc_write_u8(vs, fg);
1008 tight_encode_mono_rect8(vs->tight.buffer, w, h, bg, fg);
1009 break;
1010 }
1011 vs->tight.offset = bytes;
1012
1013 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1014 return (bytes >= 0);
1015}
1016
1017struct palette_cb_priv {
1018 VncState *vs;
1019 uint8_t *header;
1020};
1021
1022static void write_palette(const char *key, QObject *obj, void *opaque)
1023{
1024 struct palette_cb_priv *priv = opaque;
1025 VncState *vs = priv->vs;
1026 uint32_t bytes = vs->clientds.pf.bytes_per_pixel;
1027 uint8_t idx = qint_get_int(qobject_to_qint(obj));
1028
1029 if (bytes == 4) {
1030 uint32_t color = tight_palette_buf2rgb(32, (uint8_t *)key);
1031
1032 ((uint32_t*)priv->header)[idx] = color;
1033 } else {
1034 uint16_t color = tight_palette_buf2rgb(16, (uint8_t *)key);
1035
1036 ((uint16_t*)priv->header)[idx] = color;
1037 }
1038}
1039
2f6f5c7a
CC		 1040static bool send_gradient_rect(VncState *vs, int w, int h)
1041{
1042 int stream = 3;
1043 int level = tight_conf[vs->tight_compression].gradient_zlib_level;
1044 size_t bytes;
1045
1046 if (vs->clientds.pf.bytes_per_pixel == 1)
1047 return send_full_color_rect(vs, w, h);
1048
1049 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1050 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1051
1052 buffer_reserve(&vs->tight_gradient, w * 3 * sizeof (int));
1053
1054 if (vs->tight_pixel24) {
1055 tight_filter_gradient24(vs, vs->tight.buffer, w, h);
1056 bytes = 3;
1057 } else if (vs->clientds.pf.bytes_per_pixel == 4) {
1058 tight_filter_gradient32(vs, (uint32_t *)vs->tight.buffer, w, h);
1059 bytes = 4;
1060 } else {
1061 tight_filter_gradient16(vs, (uint16_t *)vs->tight.buffer, w, h);
1062 bytes = 2;
1063 }
1064
1065 buffer_reset(&vs->tight_gradient);
1066
1067 bytes = w * h * bytes;
1068 vs->tight.offset = bytes;
1069
1070 bytes = tight_compress_data(vs, stream, bytes,
1071 level, Z_FILTERED);
1072 return (bytes >= 0);
1073}
1074
aa7d73fd
CC		 1075static int send_palette_rect(VncState *vs, int w, int h, struct QDict *palette)
1076{
1077 int stream = 2;
1078 int level = tight_conf[vs->tight_compression].idx_zlib_level;
1079 int colors;
1080 size_t bytes;
1081
1082 colors = qdict_size(palette);
1083
1084 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1085 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1086 vnc_write_u8(vs, colors - 1);
1087
1088 switch(vs->clientds.pf.bytes_per_pixel) {
1089 case 4:
1090 {
1091 size_t old_offset, offset;
1092 uint32_t header[qdict_size(palette)];
1093 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1094
1095 old_offset = vs->output.offset;
1096 qdict_iter(palette, write_palette, &priv);
1097 vnc_write(vs, header, sizeof(header));
1098
1099 if (vs->tight_pixel24) {
1100 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1101 vs->output.offset = old_offset + offset;
1102 }
1103
1104 tight_encode_indexed_rect32(vs->tight.buffer, w * h, palette);
1105 break;
1106 }
1107 case 2:
1108 {
1109 uint16_t header[qdict_size(palette)];
1110 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1111
1112 qdict_iter(palette, write_palette, &priv);
1113 vnc_write(vs, header, sizeof(header));
1114 tight_encode_indexed_rect16(vs->tight.buffer, w * h, palette);
1115 break;
1116 }
1117 default:
1118 return -1; /* No palette for 8bits colors */
1119 break;
1120 }
1121 bytes = w * h;
1122 vs->tight.offset = bytes;
1123
1124 bytes = tight_compress_data(vs, stream, bytes,
1125 level, Z_DEFAULT_STRATEGY);
1126 return (bytes >= 0);
1127}
1128
2f6f5c7a
CC		 1129/*
1130 * JPEG compression stuff.
1131 */
1132#ifdef CONFIG_VNC_JPEG
1133static void jpeg_prepare_row24(VncState *vs, uint8_t *dst, int x, int y,
1134 int count)
1135{
1136 VncDisplay *vd = vs->vd;
1137 uint32_t *fbptr;
1138 uint32_t pix;
1139
1140 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) +
1141 x * ds_get_bytes_per_pixel(vs->ds));
1142
1143 while (count--) {
1144 pix = *fbptr++;
1145 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift);
1146 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift);
1147 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift);
1148 }
1149}
1150
1151#define DEFINE_JPEG_GET_ROW_FUNCTION(bpp) \
1152 \
1153 static void \
1154 jpeg_prepare_row##bpp(VncState *vs, uint8_t *dst, \
1155 int x, int y, int count) \
1156 { \
1157 VncDisplay *vd = vs->vd; \
1158 uint##bpp##_t *fbptr; \
1159 uint##bpp##_t pix; \
1160 int r, g, b; \
1161 \
1162 fbptr = (uint##bpp##_t *) \
1163 (vd->server->data + y * ds_get_linesize(vs->ds) + \
1164 x * ds_get_bytes_per_pixel(vs->ds)); \
1165 \
1166 while (count--) { \
1167 pix = *fbptr++; \
1168 \
1169 r = (int)((pix >> vs->ds->surface->pf.rshift) \
1170 & vs->ds->surface->pf.rmax); \
1171 g = (int)((pix >> vs->ds->surface->pf.gshift) \
1172 & vs->ds->surface->pf.gmax); \
1173 b = (int)((pix >> vs->ds->surface->pf.bshift) \
1174 & vs->ds->surface->pf.bmax); \
1175 \
1176 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \
1177 / vs->ds->surface->pf.rmax); \
1178 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \
1179 / vs->ds->surface->pf.gmax); \
1180 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \
1181 / vs->ds->surface->pf.bmax); \
1182 } \
1183 }
1184
1185DEFINE_JPEG_GET_ROW_FUNCTION(16)
1186DEFINE_JPEG_GET_ROW_FUNCTION(32)
1187
1188static void jpeg_prepare_row(VncState *vs, uint8_t *dst, int x, int y,
1189 int count)
1190{
1191 if (vs->tight_pixel24)
1192 jpeg_prepare_row24(vs, dst, x, y, count);
1193 else if (ds_get_bytes_per_pixel(vs->ds) == 4)
1194 jpeg_prepare_row32(vs, dst, x, y, count);
1195 else
1196 jpeg_prepare_row16(vs, dst, x, y, count);
1197}
1198
1199/*
1200 * Destination manager implementation for JPEG library.
1201 */
1202
1203/* This is called once per encoding */
1204static void jpeg_init_destination(j_compress_ptr cinfo)
1205{
1206 VncState *vs = cinfo->client_data;
1207 Buffer *buffer = &vs->tight_jpeg;
1208
1209 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1210 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1211}
1212
1213/* This is called when we ran out of buffer (shouldn't happen!) */
1214static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1215{
1216 VncState *vs = cinfo->client_data;
1217 Buffer *buffer = &vs->tight_jpeg;
1218
1219 buffer->offset = buffer->capacity;
1220 buffer_reserve(buffer, 2048);
1221 jpeg_init_destination(cinfo);
1222 return TRUE;
1223}
1224
1225/* This is called when we are done processing data */
1226static void jpeg_term_destination(j_compress_ptr cinfo)
1227{
1228 VncState *vs = cinfo->client_data;
1229 Buffer *buffer = &vs->tight_jpeg;
1230
1231 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1232}
1233
1234static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1235{
1236 struct jpeg_compress_struct cinfo;
1237 struct jpeg_error_mgr jerr;
1238 struct jpeg_destination_mgr manager;
1239 JSAMPROW row[1];
1240 uint8_t *buf;
1241 int dy;
1242
1243 if (ds_get_bytes_per_pixel(vs->ds) == 1)
1244 return send_full_color_rect(vs, w, h);
1245
1246 buf = qemu_malloc(w * 3);
1247 row[0] = buf;
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 for (dy = 0; dy < h; dy++) {
1270 jpeg_prepare_row(vs, buf, x, y + dy, w);
1271 jpeg_write_scanlines(&cinfo, row, 1);
1272 }
1273
1274 jpeg_finish_compress(&cinfo);
1275 jpeg_destroy_compress(&cinfo);
1276
1277 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1278
1279 tight_send_compact_size(vs, vs->tight_jpeg.offset);
1280 vnc_write(vs, vs->tight_jpeg.buffer, vs->tight_jpeg.offset);
1281 buffer_reset(&vs->tight_jpeg);
1282
1283 return 1;
1284}
1285#endif /* CONFIG_VNC_JPEG */
1286
380282b0
CC		 1287static void vnc_tight_start(VncState *vs)
1288{
1289 buffer_reset(&vs->tight);
1290
1291 // make the output buffer be the zlib buffer, so we can compress it later
1292 vs->tight_tmp = vs->output;
1293 vs->output = vs->tight;
1294}
1295
1296static void vnc_tight_stop(VncState *vs)
1297{
1298 // switch back to normal output/zlib buffers
1299 vs->tight = vs->output;
1300 vs->output = vs->tight_tmp;
1301}
1302
1303static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1304{
aa7d73fd
CC		 1305 struct QDict *palette = NULL;
1306 uint32_t bg = 0, fg = 0;
1307 int colors;
1308 int ret = 0;
1309
380282b0
CC		 1310 vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT);
1311
380282b0
CC		 1312 vnc_tight_start(vs);
1313 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1314 vnc_tight_stop(vs);
1315
aa7d73fd
CC		 1316 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
1317
1318 if (colors == 0) {
2f6f5c7a
CC		 1319 if (tight_detect_smooth_image(vs, w, h)) {
1320 if (vs->tight_quality == -1) {
1321 ret = send_gradient_rect(vs, w, h);
1322 } else {
1323#ifdef CONFIG_VNC_JPEG
1324 int quality = tight_conf[vs->tight_quality].jpeg_quality;
1325
1326 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1327#else
1328 ret = send_full_color_rect(vs, w, h);
1329#endif
1330 }
1331 } else {
1332 ret = send_full_color_rect(vs, w, h);
1333 }
aa7d73fd
CC		 1334 } else if (colors == 1) {
1335 ret = send_solid_rect(vs);
1336 } else if (colors == 2) {
1337 ret = send_mono_rect(vs, w, h, bg, fg);
1338 } else if (colors <= 256) {
2f6f5c7a
CC		 1339#ifdef CONFIG_VNC_JPEG
1340 if (colors > 96 && vs->tight_quality != -1 && vs->tight_quality <= 3 &&
1341 tight_detect_smooth_image(vs, w, h)) {
1342 int quality = tight_conf[vs->tight_quality].jpeg_quality;
1343
1344 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1345 } else {
1346 ret = send_palette_rect(vs, w, h, palette);
1347 }
1348#else
aa7d73fd 1349 ret = send_palette_rect(vs, w, h, palette);
2f6f5c7a 1350#endif
aa7d73fd
CC		 1351 }
1352 QDECREF(palette);
1353 return ret;
380282b0
CC		 1354}
1355
b4bea3f2
CC		 1356static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1357{
1358 vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT);
1359
1360 vnc_tight_start(vs);
1361 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1362 vnc_tight_stop(vs);
1363
1364 return send_solid_rect(vs);
1365}
1366
380282b0
CC		 1367static int send_rect_simple(VncState *vs, int x, int y, int w, int h)
1368{
1369 int max_size, max_width;
1370 int max_sub_width, max_sub_height;
1371 int dx, dy;
1372 int rw, rh;
1373 int n = 0;
1374
1375 max_size = tight_conf[vs->tight_compression].max_rect_size;
1376 max_width = tight_conf[vs->tight_compression].max_rect_width;
1377
1378 if (w > max_width || w * h > max_size) {
1379 max_sub_width = (w > max_width) ? max_width : w;
1380 max_sub_height = max_size / max_sub_width;
1381
1382 for (dy = 0; dy < h; dy += max_sub_height) {
1383 for (dx = 0; dx < w; dx += max_width) {
1384 rw = MIN(max_sub_width, w - dx);
1385 rh = MIN(max_sub_height, h - dy);
1386 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1387 }
1388 }
1389 } else {
1390 n += send_sub_rect(vs, x, y, w, h);
1391 }
1392
1393 return n;
1394}
1395
b4bea3f2
CC		 1396static int find_large_solid_color_rect(VncState *vs, int x, int y,
1397 int w, int h, int max_rows)
1398{
1399 int dx, dy, dw, dh;
1400 int n = 0;
1401
1402 /* Try to find large solid-color areas and send them separately. */
1403
1404 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1405
1406 /* If a rectangle becomes too large, send its upper part now. */
1407
1408 if (dy - y >= max_rows) {
1409 n += send_rect_simple(vs, x, y, w, max_rows);
1410 y += max_rows;
1411 h -= max_rows;
1412 }
1413
1414 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1415
1416 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1417 uint32_t color_value;
1418 int x_best, y_best, w_best, h_best;
1419
1420 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1421
1422 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1423 continue ;
1424 }
1425
1426 /* Get dimensions of solid-color area. */
1427
1428 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1429 color_value, &w_best, &h_best);
1430
1431 /* Make sure a solid rectangle is large enough
1432 (or the whole rectangle is of the same color). */
1433
1434 if (w_best * h_best != w * h &&
1435 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1436 continue;
1437 }
1438
1439 /* Try to extend solid rectangle to maximum size. */
1440
1441 x_best = dx; y_best = dy;
1442 extend_solid_area(vs, x, y, w, h, color_value,
1443 &x_best, &y_best, &w_best, &h_best);
1444
1445 /* Send rectangles at top and left to solid-color area. */
1446
1447 if (y_best != y) {
1448 n += send_rect_simple(vs, x, y, w, y_best-y);
1449 }
1450 if (x_best != x) {
1451 n += vnc_tight_send_framebuffer_update(vs, x, y_best,
1452 x_best-x, h_best);
1453 }
1454
1455 /* Send solid-color rectangle. */
1456 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1457
1458 /* Send remaining rectangles (at right and bottom). */
1459
1460 if (x_best + w_best != x + w) {
1461 n += vnc_tight_send_framebuffer_update(vs, x_best+w_best,
1462 y_best,
1463 w-(x_best-x)-w_best,
1464 h_best);
1465 }
1466 if (y_best + h_best != y + h) {
1467 n += vnc_tight_send_framebuffer_update(vs, x, y_best+h_best,
1468 w, h-(y_best-y)-h_best);
1469 }
1470
1471 /* Return after all recursive calls are done. */
1472 return n;
1473 }
1474 }
1475 return n + send_rect_simple(vs, x, y, w, h);
1476}
1477
380282b0
CC		 1478int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1479 int w, int h)
1480{
b4bea3f2
CC		 1481 int max_rows;
1482
380282b0
CC		 1483 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
1484 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
1485 vs->tight_pixel24 = true;
1486 } else {
1487 vs->tight_pixel24 = false;
1488 }
1489
b4bea3f2
CC		 1490 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE)
1491 return send_rect_simple(vs, x, y, w, h);
1492
1493 /* Calculate maximum number of rows in one non-solid rectangle. */
1494
1495 max_rows = tight_conf[vs->tight_compression].max_rect_size;
1496 max_rows /= MIN(tight_conf[vs->tight_compression].max_rect_width, w);
1497
1498 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
380282b0
CC		 1499}
1500
1501void vnc_tight_clear(VncState *vs)
1502{
1503 int i;
1504 for (i=0; i<ARRAY_SIZE(vs->tight_stream); i++) {
1505 if (vs->tight_stream[i].opaque) {
1506 deflateEnd(&vs->tight_stream[i]);
1507 }
1508 }
1509
1510 buffer_free(&vs->tight);
1511 buffer_free(&vs->tight_zlib);
2f6f5c7a
CC		 1512 buffer_free(&vs->tight_gradient);
1513#ifdef CONFIG_VNC_JPEG
1514 buffer_free(&vs->tight_jpeg);
1515#endif
380282b0 1516}
Qemu copy for testing