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target/s390x: fix pgm irq ilen for stsi
[qemu.git] / ui / vnc-enc-tight.c
blob89ab12c0d808e0defda5801b085696274634a1ec
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 #include "qemu-common.h"
35
36 #ifdef CONFIG_VNC_PNG
37 /* The following define is needed by pngconf.h. Otherwise it won't compile,
38 because setjmp.h was already included by qemu-common.h. */
39 #define PNG_SKIP_SETJMP_CHECK
40 #include <png.h>
41 #endif
42 #ifdef CONFIG_VNC_JPEG
43 #include <jpeglib.h>
44 #endif
45
46 #include "qemu/bswap.h"
47 #include "vnc.h"
48 #include "vnc-enc-tight.h"
49 #include "vnc-palette.h"
50
51 /* Compression level stuff. The following array contains various
52 encoder parameters for each of 10 compression levels (0..9).
53 Last three parameters correspond to JPEG quality levels (0..9). */
54
55 static const struct {
56 int max_rect_size, max_rect_width;
57 int mono_min_rect_size, gradient_min_rect_size;
58 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
59 int gradient_threshold, gradient_threshold24;
60 int idx_max_colors_divisor;
61 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
62 } tight_conf[] = {
63 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
64 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
65 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
66 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
67 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
68 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
69 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
70 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
71 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
72 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
73 };
74
75
76 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
77 int w, int h);
78
79 #ifdef CONFIG_VNC_JPEG
80 static const struct {
81 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */
82 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
83 int jpeg_idx; /* Allow indexed JPEG */
84 int jpeg_full; /* Allow full color JPEG */
85 } tight_jpeg_conf[] = {
86 { 0, 8, 1, 1 },
87 { 0, 8, 1, 1 },
88 { 0, 8, 1, 1 },
89 { 0, 8, 1, 1 },
90 { 0, 10, 1, 1 },
91 { 0.1, 10, 1, 1 },
92 { 0.2, 10, 1, 1 },
93 { 0.3, 12, 0, 0 },
94 { 0.4, 14, 0, 0 },
95 { 0.5, 16, 0, 0 },
96 };
97 #endif
98
99 #ifdef CONFIG_VNC_PNG
100 static const struct {
101 int png_zlib_level, png_filters;
102 } tight_png_conf[] = {
103 { 0, PNG_NO_FILTERS },
104 { 1, PNG_NO_FILTERS },
105 { 2, PNG_NO_FILTERS },
106 { 3, PNG_NO_FILTERS },
107 { 4, PNG_NO_FILTERS },
108 { 5, PNG_ALL_FILTERS },
109 { 6, PNG_ALL_FILTERS },
110 { 7, PNG_ALL_FILTERS },
111 { 8, PNG_ALL_FILTERS },
112 { 9, PNG_ALL_FILTERS },
113 };
114
115 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
116 VncPalette *palette);
117
118 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
119 {
120 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
121 return false;
122 }
123
124 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
125 vs->client_pf.bytes_per_pixel == 1) {
126 return false;
127 }
128
129 return true;
130 }
131 #endif
132
133 /*
134 * Code to guess if given rectangle is suitable for smooth image
135 * compression (by applying "gradient" filter or JPEG coder).
136 */
137
138 static unsigned int
139 tight_detect_smooth_image24(VncState *vs, int w, int h)
140 {
141 int off;
142 int x, y, d, dx;
143 unsigned int c;
144 unsigned int stats[256];
145 int pixels = 0;
146 int pix, left[3];
147 unsigned int errors;
148 unsigned char *buf = vs->tight.tight.buffer;
149
150 /*
151 * If client is big-endian, color samples begin from the second
152 * byte (offset 1) of a 32-bit pixel value.
153 */
154 off = vs->client_be;
155
156 memset(stats, 0, sizeof (stats));
157
158 for (y = 0, x = 0; y < h && x < w;) {
159 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
160 d++) {
161 for (c = 0; c < 3; c++) {
162 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
163 }
164 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
165 for (c = 0; c < 3; c++) {
166 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
167 stats[abs(pix - left[c])]++;
168 left[c] = pix;
169 }
170 pixels++;
171 }
172 }
173 if (w > h) {
174 x += h;
175 y = 0;
176 } else {
177 x = 0;
178 y += w;
179 }
180 }
181
182 if (pixels == 0) {
183 return 0;
184 }
185
186 /* 95% smooth or more ... */
187 if (stats[0] * 33 / pixels >= 95) {
188 return 0;
189 }
190
191 errors = 0;
192 for (c = 1; c < 8; c++) {
193 errors += stats[c] * (c * c);
194 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
195 return 0;
196 }
197 }
198 for (; c < 256; c++) {
199 errors += stats[c] * (c * c);
200 }
201 errors /= (pixels * 3 - stats[0]);
202
203 return errors;
204 }
205
206 #define DEFINE_DETECT_FUNCTION(bpp) \
207 \
208 static unsigned int \
209 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
210 bool endian; \
211 uint##bpp##_t pix; \
212 int max[3], shift[3]; \
213 int x, y, d, dx; \
214 unsigned int c; \
215 unsigned int stats[256]; \
216 int pixels = 0; \
217 int sample, sum, left[3]; \
218 unsigned int errors; \
219 unsigned char *buf = vs->tight.tight.buffer; \
220 \
221 endian = 0; /* FIXME */ \
222 \
223 \
224 max[0] = vs->client_pf.rmax; \
225 max[1] = vs->client_pf.gmax; \
226 max[2] = vs->client_pf.bmax; \
227 shift[0] = vs->client_pf.rshift; \
228 shift[1] = vs->client_pf.gshift; \
229 shift[2] = vs->client_pf.bshift; \
230 \
231 memset(stats, 0, sizeof(stats)); \
232 \
233 y = 0, x = 0; \
234 while (y < h && x < w) { \
235 for (d = 0; d < h - y && \
236 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
237 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
238 if (endian) { \
239 pix = bswap##bpp(pix); \
240 } \
241 for (c = 0; c < 3; c++) { \
242 left[c] = (int)(pix >> shift[c] & max[c]); \
243 } \
244 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
245 dx++) { \
246 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
247 if (endian) { \
248 pix = bswap##bpp(pix); \
249 } \
250 sum = 0; \
251 for (c = 0; c < 3; c++) { \
252 sample = (int)(pix >> shift[c] & max[c]); \
253 sum += abs(sample - left[c]); \
254 left[c] = sample; \
255 } \
256 if (sum > 255) { \
257 sum = 255; \
258 } \
259 stats[sum]++; \
260 pixels++; \
261 } \
262 } \
263 if (w > h) { \
264 x += h; \
265 y = 0; \
266 } else { \
267 x = 0; \
268 y += w; \
269 } \
270 } \
271 if (pixels == 0) { \
272 return 0; \
273 } \
274 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
275 return 0; \
276 } \
277 \
278 errors = 0; \
279 for (c = 1; c < 8; c++) { \
280 errors += stats[c] * (c * c); \
281 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
282 return 0; \
283 } \
284 } \
285 for (; c < 256; c++) { \
286 errors += stats[c] * (c * c); \
287 } \
288 errors /= (pixels - stats[0]); \
289 \
290 return errors; \
291 }
292
293 DEFINE_DETECT_FUNCTION(16)
294 DEFINE_DETECT_FUNCTION(32)
295
296 static int
297 tight_detect_smooth_image(VncState *vs, int w, int h)
298 {
299 unsigned int errors;
300 int compression = vs->tight.compression;
301 int quality = vs->tight.quality;
302
303 if (!vs->vd->lossy) {
304 return 0;
305 }
306
307 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
308 vs->client_pf.bytes_per_pixel == 1 ||
309 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
310 return 0;
311 }
312
313 if (vs->tight.quality != (uint8_t)-1) {
314 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
315 return 0;
316 }
317 } else {
318 if (w * h < tight_conf[compression].gradient_min_rect_size) {
319 return 0;
320 }
321 }
322
323 if (vs->client_pf.bytes_per_pixel == 4) {
324 if (vs->tight.pixel24) {
325 errors = tight_detect_smooth_image24(vs, w, h);
326 if (vs->tight.quality != (uint8_t)-1) {
327 return (errors < tight_conf[quality].jpeg_threshold24);
328 }
329 return (errors < tight_conf[compression].gradient_threshold24);
330 } else {
331 errors = tight_detect_smooth_image32(vs, w, h);
332 }
333 } else {
334 errors = tight_detect_smooth_image16(vs, w, h);
335 }
336 if (quality != (uint8_t)-1) {
337 return (errors < tight_conf[quality].jpeg_threshold);
338 }
339 return (errors < tight_conf[compression].gradient_threshold);
340 }
341
342 /*
343 * Code to determine how many different colors used in rectangle.
344 */
345 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
346 \
347 static int \
348 tight_fill_palette##bpp(VncState *vs, int x, int y, \
349 int max, size_t count, \
350 uint32_t *bg, uint32_t *fg, \
351 VncPalette *palette) { \
352 uint##bpp##_t *data; \
353 uint##bpp##_t c0, c1, ci; \
354 int i, n0, n1; \
355 \
356 data = (uint##bpp##_t *)vs->tight.tight.buffer; \
357 \
358 c0 = data[0]; \
359 i = 1; \
360 while (i < count && data[i] == c0) \
361 i++; \
362 if (i >= count) { \
363 *bg = *fg = c0; \
364 return 1; \
365 } \
366 \
367 if (max < 2) { \
368 return 0; \
369 } \
370 \
371 n0 = i; \
372 c1 = data[i]; \
373 n1 = 0; \
374 for (i++; i < count; i++) { \
375 ci = data[i]; \
376 if (ci == c0) { \
377 n0++; \
378 } else if (ci == c1) { \
379 n1++; \
380 } else \
381 break; \
382 } \
383 if (i >= count) { \
384 if (n0 > n1) { \
385 *bg = (uint32_t)c0; \
386 *fg = (uint32_t)c1; \
387 } else { \
388 *bg = (uint32_t)c1; \
389 *fg = (uint32_t)c0; \
390 } \
391 return 2; \
392 } \
393 \
394 if (max == 2) { \
395 return 0; \
396 } \
397 \
398 palette_init(palette, max, bpp); \
399 palette_put(palette, c0); \
400 palette_put(palette, c1); \
401 palette_put(palette, ci); \
402 \
403 for (i++; i < count; i++) { \
404 if (data[i] == ci) { \
405 continue; \
406 } else { \
407 ci = data[i]; \
408 if (!palette_put(palette, (uint32_t)ci)) { \
409 return 0; \
410 } \
411 } \
412 } \
413 \
414 return palette_size(palette); \
415 }
416
417 DEFINE_FILL_PALETTE_FUNCTION(8)
418 DEFINE_FILL_PALETTE_FUNCTION(16)
419 DEFINE_FILL_PALETTE_FUNCTION(32)
420
421 static int tight_fill_palette(VncState *vs, int x, int y,
422 size_t count, uint32_t *bg, uint32_t *fg,
423 VncPalette *palette)
424 {
425 int max;
426
427 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
428 if (max < 2 &&
429 count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
430 max = 2;
431 }
432 if (max >= 256) {
433 max = 256;
434 }
435
436 switch (vs->client_pf.bytes_per_pixel) {
437 case 4:
438 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
439 case 2:
440 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
441 default:
442 max = 2;
443 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
444 }
445 return 0;
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 VncPalette *palette) { \
456 uint##bpp##_t *src; \
457 uint##bpp##_t rgb; \
458 int i, rep; \
459 uint8_t idx; \
460 \
461 src = (uint##bpp##_t *) buf; \
462 \
463 for (i = 0; i < count; ) { \
464 \
465 rgb = *src++; \
466 i++; \
467 rep = 0; \
468 while (i < count && *src == rgb) { \
469 rep++, src++, i++; \
470 } \
471 idx = palette_idx(palette, rgb); \
472 /* \
473 * Should never happen, but don't break everything \
474 * if it does, use the first color instead \
475 */ \
476 if (idx == (uint8_t)-1) { \
477 idx = 0; \
478 } \
479 while (rep >= 0) { \
480 *buf++ = idx; \
481 rep--; \
482 } \
483 } \
484 }
485
486 DEFINE_IDX_ENCODE_FUNCTION(16)
487 DEFINE_IDX_ENCODE_FUNCTION(32)
488
489 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \
490 \
491 static void \
492 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \
493 uint##bpp##_t bg, uint##bpp##_t fg) { \
494 uint##bpp##_t *ptr; \
495 unsigned int value, mask; \
496 int aligned_width; \
497 int x, y, bg_bits; \
498 \
499 ptr = (uint##bpp##_t *) buf; \
500 aligned_width = w - w % 8; \
501 \
502 for (y = 0; y < h; y++) { \
503 for (x = 0; x < aligned_width; x += 8) { \
504 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \
505 if (*ptr++ != bg) { \
506 break; \
507 } \
508 } \
509 if (bg_bits == 8) { \
510 *buf++ = 0; \
511 continue; \
512 } \
513 mask = 0x80 >> bg_bits; \
514 value = mask; \
515 for (bg_bits++; bg_bits < 8; bg_bits++) { \
516 mask >>= 1; \
517 if (*ptr++ != bg) { \
518 value |= mask; \
519 } \
520 } \
521 *buf++ = (uint8_t)value; \
522 } \
523 \
524 mask = 0x80; \
525 value = 0; \
526 if (x >= w) { \
527 continue; \
528 } \
529 \
530 for (; x < w; x++) { \
531 if (*ptr++ != bg) { \
532 value |= mask; \
533 } \
534 mask >>= 1; \
535 } \
536 *buf++ = (uint8_t)value; \
537 } \
538 }
539
540 DEFINE_MONO_ENCODE_FUNCTION(8)
541 DEFINE_MONO_ENCODE_FUNCTION(16)
542 DEFINE_MONO_ENCODE_FUNCTION(32)
543
544 /*
545 * ``Gradient'' filter for 24-bit color samples.
546 * Should be called only when redMax, greenMax and blueMax are 255.
547 * Color components assumed to be byte-aligned.
548 */
549
550 static void
551 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
552 {
553 uint32_t *buf32;
554 uint32_t pix32;
555 int shift[3];
556 int *prev;
557 int here[3], upper[3], left[3], upperleft[3];
558 int prediction;
559 int x, y, c;
560
561 buf32 = (uint32_t *)buf;
562 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));
563
564 if (1 /* FIXME */) {
565 shift[0] = vs->client_pf.rshift;
566 shift[1] = vs->client_pf.gshift;
567 shift[2] = vs->client_pf.bshift;
568 } else {
569 shift[0] = 24 - vs->client_pf.rshift;
570 shift[1] = 24 - vs->client_pf.gshift;
571 shift[2] = 24 - vs->client_pf.bshift;
572 }
573
574 for (y = 0; y < h; y++) {
575 for (c = 0; c < 3; c++) {
576 upper[c] = 0;
577 here[c] = 0;
578 }
579 prev = (int *)vs->tight.gradient.buffer;
580 for (x = 0; x < w; x++) {
581 pix32 = *buf32++;
582 for (c = 0; c < 3; c++) {
583 upperleft[c] = upper[c];
584 left[c] = here[c];
585 upper[c] = *prev;
586 here[c] = (int)(pix32 >> shift[c] & 0xFF);
587 *prev++ = here[c];
588
589 prediction = left[c] + upper[c] - upperleft[c];
590 if (prediction < 0) {
591 prediction = 0;
592 } else if (prediction > 0xFF) {
593 prediction = 0xFF;
594 }
595 *buf++ = (char)(here[c] - prediction);
596 }
597 }
598 }
599 }
600
601
602 /*
603 * ``Gradient'' filter for other color depths.
604 */
605
606 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
607 \
608 static void \
609 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
610 int w, int h) { \
611 uint##bpp##_t pix, diff; \
612 bool endian; \
613 int *prev; \
614 int max[3], shift[3]; \
615 int here[3], upper[3], left[3], upperleft[3]; \
616 int prediction; \
617 int x, y, c; \
618 \
619 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \
620 \
621 endian = 0; /* FIXME */ \
622 \
623 max[0] = vs->client_pf.rmax; \
624 max[1] = vs->client_pf.gmax; \
625 max[2] = vs->client_pf.bmax; \
626 shift[0] = vs->client_pf.rshift; \
627 shift[1] = vs->client_pf.gshift; \
628 shift[2] = vs->client_pf.bshift; \
629 \
630 for (y = 0; y < h; y++) { \
631 for (c = 0; c < 3; c++) { \
632 upper[c] = 0; \
633 here[c] = 0; \
634 } \
635 prev = (int *)vs->tight.gradient.buffer; \
636 for (x = 0; x < w; x++) { \
637 pix = *buf; \
638 if (endian) { \
639 pix = bswap##bpp(pix); \
640 } \
641 diff = 0; \
642 for (c = 0; c < 3; c++) { \
643 upperleft[c] = upper[c]; \
644 left[c] = here[c]; \
645 upper[c] = *prev; \
646 here[c] = (int)(pix >> shift[c] & max[c]); \
647 *prev++ = here[c]; \
648 \
649 prediction = left[c] + upper[c] - upperleft[c]; \
650 if (prediction < 0) { \
651 prediction = 0; \
652 } else if (prediction > max[c]) { \
653 prediction = max[c]; \
654 } \
655 diff |= ((here[c] - prediction) & max[c]) \
656 << shift[c]; \
657 } \
658 if (endian) { \
659 diff = bswap##bpp(diff); \
660 } \
661 *buf++ = diff; \
662 } \
663 } \
664 }
665
666 DEFINE_GRADIENT_FILTER_FUNCTION(16)
667 DEFINE_GRADIENT_FILTER_FUNCTION(32)
668
669 /*
670 * Check if a rectangle is all of the same color. If needSameColor is
671 * set to non-zero, then also check that its color equals to the
672 * *colorPtr value. The result is 1 if the test is successful, and in
673 * that case new color will be stored in *colorPtr.
674 */
675
676 static bool
677 check_solid_tile32(VncState *vs, int x, int y, int w, int h,
678 uint32_t *color, bool samecolor)
679 {
680 VncDisplay *vd = vs->vd;
681 uint32_t *fbptr;
682 uint32_t c;
683 int dx, dy;
684
685 fbptr = vnc_server_fb_ptr(vd, x, y);
686
687 c = *fbptr;
688 if (samecolor && (uint32_t)c != *color) {
689 return false;
690 }
691
692 for (dy = 0; dy < h; dy++) {
693 for (dx = 0; dx < w; dx++) {
694 if (c != fbptr[dx]) {
695 return false;
696 }
697 }
698 fbptr = (uint32_t *)
699 ((uint8_t *)fbptr + vnc_server_fb_stride(vd));
700 }
701
702 *color = (uint32_t)c;
703 return true;
704 }
705
706 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
707 uint32_t* color, bool samecolor)
708 {
709 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4);
710 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
711 }
712
713 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
714 uint32_t color, int *w_ptr, int *h_ptr)
715 {
716 int dx, dy, dw, dh;
717 int w_prev;
718 int w_best = 0, h_best = 0;
719
720 w_prev = w;
721
722 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
723
724 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
725 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
726
727 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
728 break;
729 }
730
731 for (dx = x + dw; dx < x + w_prev;) {
732 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
733
734 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
735 break;
736 }
737 dx += dw;
738 }
739
740 w_prev = dx - x;
741 if (w_prev * (dy + dh - y) > w_best * h_best) {
742 w_best = w_prev;
743 h_best = dy + dh - y;
744 }
745 }
746
747 *w_ptr = w_best;
748 *h_ptr = h_best;
749 }
750
751 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
752 uint32_t color, int *x_ptr, int *y_ptr,
753 int *w_ptr, int *h_ptr)
754 {
755 int cx, cy;
756
757 /* Try to extend the area upwards. */
758 for ( cy = *y_ptr - 1;
759 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
760 cy-- );
761 *h_ptr += *y_ptr - (cy + 1);
762 *y_ptr = cy + 1;
763
764 /* ... downwards. */
765 for ( cy = *y_ptr + *h_ptr;
766 cy < y + h &&
767 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
768 cy++ );
769 *h_ptr += cy - (*y_ptr + *h_ptr);
770
771 /* ... to the left. */
772 for ( cx = *x_ptr - 1;
773 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
774 cx-- );
775 *w_ptr += *x_ptr - (cx + 1);
776 *x_ptr = cx + 1;
777
778 /* ... to the right. */
779 for ( cx = *x_ptr + *w_ptr;
780 cx < x + w &&
781 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
782 cx++ );
783 *w_ptr += cx - (*x_ptr + *w_ptr);
784 }
785
786 static int tight_init_stream(VncState *vs, int stream_id,
787 int level, int strategy)
788 {
789 z_streamp zstream = &vs->tight.stream[stream_id];
790
791 if (zstream->opaque == NULL) {
792 int err;
793
794 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
795 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
796 zstream->zalloc = vnc_zlib_zalloc;
797 zstream->zfree = vnc_zlib_zfree;
798
799 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
800 MAX_MEM_LEVEL, strategy);
801
802 if (err != Z_OK) {
803 fprintf(stderr, "VNC: error initializing zlib\n");
804 return -1;
805 }
806
807 vs->tight.levels[stream_id] = level;
808 zstream->opaque = vs;
809 }
810
811 if (vs->tight.levels[stream_id] != level) {
812 if (deflateParams(zstream, level, strategy) != Z_OK) {
813 return -1;
814 }
815 vs->tight.levels[stream_id] = level;
816 }
817 return 0;
818 }
819
820 static void tight_send_compact_size(VncState *vs, size_t len)
821 {
822 int lpc = 0;
823 int bytes = 0;
824 char buf[3] = {0, 0, 0};
825
826 buf[bytes++] = len & 0x7F;
827 if (len > 0x7F) {
828 buf[bytes-1] |= 0x80;
829 buf[bytes++] = (len >> 7) & 0x7F;
830 if (len > 0x3FFF) {
831 buf[bytes-1] |= 0x80;
832 buf[bytes++] = (len >> 14) & 0xFF;
833 }
834 }
835 for (lpc = 0; lpc < bytes; lpc++) {
836 vnc_write_u8(vs, buf[lpc]);
837 }
838 }
839
840 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
841 int level, int strategy)
842 {
843 z_streamp zstream = &vs->tight.stream[stream_id];
844 int previous_out;
845
846 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
847 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
848 return bytes;
849 }
850
851 if (tight_init_stream(vs, stream_id, level, strategy)) {
852 return -1;
853 }
854
855 /* reserve memory in output buffer */
856 buffer_reserve(&vs->tight.zlib, bytes + 64);
857
858 /* set pointers */
859 zstream->next_in = vs->tight.tight.buffer;
860 zstream->avail_in = vs->tight.tight.offset;
861 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
862 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
863 previous_out = zstream->avail_out;
864 zstream->data_type = Z_BINARY;
865
866 /* start encoding */
867 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
868 fprintf(stderr, "VNC: error during tight compression\n");
869 return -1;
870 }
871
872 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
873 /* ...how much data has actually been produced by deflate() */
874 bytes = previous_out - zstream->avail_out;
875
876 tight_send_compact_size(vs, bytes);
877 vnc_write(vs, vs->tight.zlib.buffer, bytes);
878
879 buffer_reset(&vs->tight.zlib);
880
881 return bytes;
882 }
883
884 /*
885 * Subencoding implementations.
886 */
887 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
888 {
889 uint32_t *buf32;
890 uint32_t pix;
891 int rshift, gshift, bshift;
892
893 buf32 = (uint32_t *)buf;
894
895 if (1 /* FIXME */) {
896 rshift = vs->client_pf.rshift;
897 gshift = vs->client_pf.gshift;
898 bshift = vs->client_pf.bshift;
899 } else {
900 rshift = 24 - vs->client_pf.rshift;
901 gshift = 24 - vs->client_pf.gshift;
902 bshift = 24 - vs->client_pf.bshift;
903 }
904
905 if (ret) {
906 *ret = count * 3;
907 }
908
909 while (count--) {
910 pix = *buf32++;
911 *buf++ = (char)(pix >> rshift);
912 *buf++ = (char)(pix >> gshift);
913 *buf++ = (char)(pix >> bshift);
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, &vs->tight.tight.offset);
932 bytes = 3;
933 } else {
934 bytes = vs->client_pf.bytes_per_pixel;
935 }
936
937 bytes = tight_compress_data(vs, stream, w * h * bytes,
938 tight_conf[vs->tight.compression].raw_zlib_level,
939 Z_DEFAULT_STRATEGY);
940
941 return (bytes >= 0);
942 }
943
944 static int send_solid_rect(VncState *vs)
945 {
946 size_t bytes;
947
948 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
949
950 if (vs->tight.pixel24) {
951 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset);
952 bytes = 3;
953 } else {
954 bytes = vs->client_pf.bytes_per_pixel;
955 }
956
957 vnc_write(vs, vs->tight.tight.buffer, bytes);
958 return 1;
959 }
960
961 static int send_mono_rect(VncState *vs, int x, int y,
962 int w, int h, uint32_t bg, uint32_t fg)
963 {
964 ssize_t bytes;
965 int stream = 1;
966 int level = tight_conf[vs->tight.compression].mono_zlib_level;
967
968 #ifdef CONFIG_VNC_PNG
969 if (tight_can_send_png_rect(vs, w, h)) {
970 int ret;
971 int bpp = vs->client_pf.bytes_per_pixel * 8;
972 VncPalette *palette = palette_new(2, bpp);
973
974 palette_put(palette, bg);
975 palette_put(palette, fg);
976 ret = send_png_rect(vs, x, y, w, h, palette);
977 palette_destroy(palette);
978 return ret;
979 }
980 #endif
981
982 bytes = ((w + 7) / 8) * h;
983
984 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
985 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
986 vnc_write_u8(vs, 1);
987
988 switch (vs->client_pf.bytes_per_pixel) {
989 case 4:
990 {
991 uint32_t buf[2] = {bg, fg};
992 size_t ret = sizeof (buf);
993
994 if (vs->tight.pixel24) {
995 tight_pack24(vs, (unsigned char*)buf, 2, &ret);
996 }
997 vnc_write(vs, buf, ret);
998
999 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg);
1000 break;
1001 }
1002 case 2:
1003 vnc_write(vs, &bg, 2);
1004 vnc_write(vs, &fg, 2);
1005 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg);
1006 break;
1007 default:
1008 vnc_write_u8(vs, bg);
1009 vnc_write_u8(vs, fg);
1010 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg);
1011 break;
1012 }
1013 vs->tight.tight.offset = bytes;
1014
1015 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1016 return (bytes >= 0);
1017 }
1018
1019 struct palette_cb_priv {
1020 VncState *vs;
1021 uint8_t *header;
1022 #ifdef CONFIG_VNC_PNG
1023 png_colorp png_palette;
1024 #endif
1025 };
1026
1027 static void write_palette(int idx, uint32_t color, void *opaque)
1028 {
1029 struct palette_cb_priv *priv = opaque;
1030 VncState *vs = priv->vs;
1031 uint32_t bytes = vs->client_pf.bytes_per_pixel;
1032
1033 if (bytes == 4) {
1034 ((uint32_t*)priv->header)[idx] = color;
1035 } else {
1036 ((uint16_t*)priv->header)[idx] = color;
1037 }
1038 }
1039
1040 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h)
1041 {
1042 int stream = 3;
1043 int level = tight_conf[vs->tight.compression].gradient_zlib_level;
1044 ssize_t bytes;
1045
1046 if (vs->client_pf.bytes_per_pixel == 1) {
1047 return send_full_color_rect(vs, x, y, w, h);
1048 }
1049
1050 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1051 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1052
1053 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int));
1054
1055 if (vs->tight.pixel24) {
1056 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h);
1057 bytes = 3;
1058 } else if (vs->client_pf.bytes_per_pixel == 4) {
1059 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h);
1060 bytes = 4;
1061 } else {
1062 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h);
1063 bytes = 2;
1064 }
1065
1066 buffer_reset(&vs->tight.gradient);
1067
1068 bytes = w * h * bytes;
1069 vs->tight.tight.offset = bytes;
1070
1071 bytes = tight_compress_data(vs, stream, bytes,
1072 level, Z_FILTERED);
1073 return (bytes >= 0);
1074 }
1075
1076 static int send_palette_rect(VncState *vs, int x, int y,
1077 int w, int h, VncPalette *palette)
1078 {
1079 int stream = 2;
1080 int level = tight_conf[vs->tight.compression].idx_zlib_level;
1081 int colors;
1082 ssize_t bytes;
1083
1084 #ifdef CONFIG_VNC_PNG
1085 if (tight_can_send_png_rect(vs, w, h)) {
1086 return send_png_rect(vs, x, y, w, h, palette);
1087 }
1088 #endif
1089
1090 colors = palette_size(palette);
1091
1092 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1093 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1094 vnc_write_u8(vs, colors - 1);
1095
1096 switch (vs->client_pf.bytes_per_pixel) {
1097 case 4:
1098 {
1099 size_t old_offset, offset;
1100 uint32_t header[palette_size(palette)];
1101 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1102
1103 old_offset = vs->output.offset;
1104 palette_iter(palette, write_palette, &priv);
1105 vnc_write(vs, header, sizeof(header));
1106
1107 if (vs->tight.pixel24) {
1108 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1109 vs->output.offset = old_offset + offset;
1110 }
1111
1112 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1113 break;
1114 }
1115 case 2:
1116 {
1117 uint16_t header[palette_size(palette)];
1118 struct palette_cb_priv priv = { vs, (uint8_t *)header };
1119
1120 palette_iter(palette, write_palette, &priv);
1121 vnc_write(vs, header, sizeof(header));
1122 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1123 break;
1124 }
1125 default:
1126 return -1; /* No palette for 8bits colors */
1127 break;
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, palette);
1344 } else {
1345 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1346 }
1347 }
1348
1349 png_write_info(png_ptr, info_ptr);
1350
1351 buffer_reserve(&vs->tight.png, 2048);
1352 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1353 buf = (uint8_t *)pixman_image_get_data(linebuf);
1354 for (dy = 0; dy < h; dy++)
1355 {
1356 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1357 memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1358 } else {
1359 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1360 }
1361 png_write_row(png_ptr, buf);
1362 }
1363 qemu_pixman_image_unref(linebuf);
1364
1365 png_write_end(png_ptr, NULL);
1366
1367 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1368 png_free(png_ptr, png_palette);
1369 }
1370
1371 png_destroy_write_struct(&png_ptr, &info_ptr);
1372
1373 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1374
1375 tight_send_compact_size(vs, vs->tight.png.offset);
1376 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1377 buffer_reset(&vs->tight.png);
1378 return 1;
1379 }
1380 #endif /* CONFIG_VNC_PNG */
1381
1382 static void vnc_tight_start(VncState *vs)
1383 {
1384 buffer_reset(&vs->tight.tight);
1385
1386 // make the output buffer be the zlib buffer, so we can compress it later
1387 vs->tight.tmp = vs->output;
1388 vs->output = vs->tight.tight;
1389 }
1390
1391 static void vnc_tight_stop(VncState *vs)
1392 {
1393 // switch back to normal output/zlib buffers
1394 vs->tight.tight = vs->output;
1395 vs->output = vs->tight.tmp;
1396 }
1397
1398 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1399 int bg, int fg, int colors, VncPalette *palette)
1400 {
1401 int ret;
1402
1403 if (colors == 0) {
1404 if (tight_detect_smooth_image(vs, w, h)) {
1405 ret = send_gradient_rect(vs, x, y, w, h);
1406 } else {
1407 ret = send_full_color_rect(vs, x, y, w, h);
1408 }
1409 } else if (colors == 1) {
1410 ret = send_solid_rect(vs);
1411 } else if (colors == 2) {
1412 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1413 } else if (colors <= 256) {
1414 ret = send_palette_rect(vs, x, y, w, h, palette);
1415 } else {
1416 ret = 0;
1417 }
1418 return ret;
1419 }
1420
1421 #ifdef CONFIG_VNC_JPEG
1422 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1423 int bg, int fg, int colors,
1424 VncPalette *palette, bool force)
1425 {
1426 int ret;
1427
1428 if (colors == 0) {
1429 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full &&
1430 tight_detect_smooth_image(vs, w, h))) {
1431 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1432
1433 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1434 } else {
1435 ret = send_full_color_rect(vs, x, y, w, h);
1436 }
1437 } else if (colors == 1) {
1438 ret = send_solid_rect(vs);
1439 } else if (colors == 2) {
1440 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1441 } else if (colors <= 256) {
1442 if (force || (colors > 96 &&
1443 tight_jpeg_conf[vs->tight.quality].jpeg_idx &&
1444 tight_detect_smooth_image(vs, w, h))) {
1445 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1446
1447 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1448 } else {
1449 ret = send_palette_rect(vs, x, y, w, h, palette);
1450 }
1451 } else {
1452 ret = 0;
1453 }
1454 return ret;
1455 }
1456 #endif
1457
1458 static __thread VncPalette *color_count_palette;
1459 static __thread Notifier vnc_tight_cleanup_notifier;
1460
1461 static void vnc_tight_cleanup(Notifier *n, void *value)
1462 {
1463 g_free(color_count_palette);
1464 color_count_palette = NULL;
1465 }
1466
1467 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1468 {
1469 uint32_t bg = 0, fg = 0;
1470 int colors;
1471 int ret = 0;
1472 #ifdef CONFIG_VNC_JPEG
1473 bool force_jpeg = false;
1474 bool allow_jpeg = true;
1475 #endif
1476
1477 if (!color_count_palette) {
1478 color_count_palette = g_malloc(sizeof(VncPalette));
1479 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup;
1480 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier);
1481 }
1482
1483 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1484
1485 vnc_tight_start(vs);
1486 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1487 vnc_tight_stop(vs);
1488
1489 #ifdef CONFIG_VNC_JPEG
1490 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) {
1491 double freq = vnc_update_freq(vs, x, y, w, h);
1492
1493 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) {
1494 allow_jpeg = false;
1495 }
1496 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1497 force_jpeg = true;
1498 vnc_sent_lossy_rect(vs, x, y, w, h);
1499 }
1500 }
1501 #endif
1502
1503 colors = tight_fill_palette(vs, x, y, w * h, &bg, &fg, color_count_palette);
1504
1505 #ifdef CONFIG_VNC_JPEG
1506 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) {
1507 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors,
1508 color_count_palette, force_jpeg);
1509 } else {
1510 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1511 color_count_palette);
1512 }
1513 #else
1514 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1515 color_count_palette);
1516 #endif
1517
1518 return ret;
1519 }
1520
1521 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1522 {
1523 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1524
1525 vnc_tight_start(vs);
1526 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1527 vnc_tight_stop(vs);
1528
1529 return send_solid_rect(vs);
1530 }
1531
1532 static int send_rect_simple(VncState *vs, int x, int y, int w, int h,
1533 bool split)
1534 {
1535 int max_size, max_width;
1536 int max_sub_width, max_sub_height;
1537 int dx, dy;
1538 int rw, rh;
1539 int n = 0;
1540
1541 max_size = tight_conf[vs->tight.compression].max_rect_size;
1542 max_width = tight_conf[vs->tight.compression].max_rect_width;
1543
1544 if (split && (w > max_width || w * h > max_size)) {
1545 max_sub_width = (w > max_width) ? max_width : w;
1546 max_sub_height = max_size / max_sub_width;
1547
1548 for (dy = 0; dy < h; dy += max_sub_height) {
1549 for (dx = 0; dx < w; dx += max_width) {
1550 rw = MIN(max_sub_width, w - dx);
1551 rh = MIN(max_sub_height, h - dy);
1552 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1553 }
1554 }
1555 } else {
1556 n += send_sub_rect(vs, x, y, w, h);
1557 }
1558
1559 return n;
1560 }
1561
1562 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1563 int w, int h, int max_rows)
1564 {
1565 int dx, dy, dw, dh;
1566 int n = 0;
1567
1568 /* Try to find large solid-color areas and send them separately. */
1569
1570 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1571
1572 /* If a rectangle becomes too large, send its upper part now. */
1573
1574 if (dy - y >= max_rows) {
1575 n += send_rect_simple(vs, x, y, w, max_rows, true);
1576 y += max_rows;
1577 h -= max_rows;
1578 }
1579
1580 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1581
1582 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1583 uint32_t color_value;
1584 int x_best, y_best, w_best, h_best;
1585
1586 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1587
1588 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1589 continue ;
1590 }
1591
1592 /* Get dimensions of solid-color area. */
1593
1594 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1595 color_value, &w_best, &h_best);
1596
1597 /* Make sure a solid rectangle is large enough
1598 (or the whole rectangle is of the same color). */
1599
1600 if (w_best * h_best != w * h &&
1601 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1602 continue;
1603 }
1604
1605 /* Try to extend solid rectangle to maximum size. */
1606
1607 x_best = dx; y_best = dy;
1608 extend_solid_area(vs, x, y, w, h, color_value,
1609 &x_best, &y_best, &w_best, &h_best);
1610
1611 /* Send rectangles at top and left to solid-color area. */
1612
1613 if (y_best != y) {
1614 n += send_rect_simple(vs, x, y, w, y_best-y, true);
1615 }
1616 if (x_best != x) {
1617 n += tight_send_framebuffer_update(vs, x, y_best,
1618 x_best-x, h_best);
1619 }
1620
1621 /* Send solid-color rectangle. */
1622 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1623
1624 /* Send remaining rectangles (at right and bottom). */
1625
1626 if (x_best + w_best != x + w) {
1627 n += tight_send_framebuffer_update(vs, x_best+w_best,
1628 y_best,
1629 w-(x_best-x)-w_best,
1630 h_best);
1631 }
1632 if (y_best + h_best != y + h) {
1633 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1634 w, h-(y_best-y)-h_best);
1635 }
1636
1637 /* Return after all recursive calls are done. */
1638 return n;
1639 }
1640 }
1641 return n + send_rect_simple(vs, x, y, w, h, true);
1642 }
1643
1644 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1645 int w, int h)
1646 {
1647 int max_rows;
1648
1649 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF &&
1650 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) {
1651 vs->tight.pixel24 = true;
1652 } else {
1653 vs->tight.pixel24 = false;
1654 }
1655
1656 #ifdef CONFIG_VNC_JPEG
1657 if (vs->tight.quality != (uint8_t)-1) {
1658 double freq = vnc_update_freq(vs, x, y, w, h);
1659
1660 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1661 return send_rect_simple(vs, x, y, w, h, false);
1662 }
1663 }
1664 #endif
1665
1666 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1667 return send_rect_simple(vs, x, y, w, h, true);
1668 }
1669
1670 /* Calculate maximum number of rows in one non-solid rectangle. */
1671
1672 max_rows = tight_conf[vs->tight.compression].max_rect_size;
1673 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1674
1675 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1676 }
1677
1678 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1679 int w, int h)
1680 {
1681 vs->tight.type = VNC_ENCODING_TIGHT;
1682 return tight_send_framebuffer_update(vs, x, y, w, h);
1683 }
1684
1685 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1686 int w, int h)
1687 {
1688 vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1689 return tight_send_framebuffer_update(vs, x, y, w, h);
1690 }
1691
1692 void vnc_tight_clear(VncState *vs)
1693 {
1694 int i;
1695 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1696 if (vs->tight.stream[i].opaque) {
1697 deflateEnd(&vs->tight.stream[i]);
1698 }
1699 }
1700
1701 buffer_free(&vs->tight.tight);
1702 buffer_free(&vs->tight.zlib);
1703 buffer_free(&vs->tight.gradient);
1704 #ifdef CONFIG_VNC_JPEG
1705 buffer_free(&vs->tight.jpeg);
1706 #endif
1707 #ifdef CONFIG_VNC_PNG
1708 buffer_free(&vs->tight.png);
1709 #endif
1710 }
QEmu