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rcu: simplify memory barriers
[qemu/ar7.git] / ui / vnc-enc-tight.c
blob1e53b1cf8477fabfaa2f0d16362636b5fa97bc2b
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 "qapi/qmp/qint.h"
48 #include "vnc.h"
49 #include "vnc-enc-tight.h"
50 #include "vnc-palette.h"
51
52 /* Compression level stuff. The following array contains various
53 encoder parameters for each of 10 compression levels (0..9).
54 Last three parameters correspond to JPEG quality levels (0..9). */
55
56 static const struct {
57 int max_rect_size, max_rect_width;
58 int mono_min_rect_size, gradient_min_rect_size;
59 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
60 int gradient_threshold, gradient_threshold24;
61 int idx_max_colors_divisor;
62 int jpeg_quality, jpeg_threshold, jpeg_threshold24;
63 } tight_conf[] = {
64 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 },
65 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 },
66 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 },
67 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 },
68 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 },
69 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 },
70 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 },
71 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 },
72 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 },
73 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 }
74 };
75
76
77 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
78 int w, int h);
79
80 #ifdef CONFIG_VNC_JPEG
81 static const struct {
82 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */
83 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */
84 int jpeg_idx; /* Allow indexed JPEG */
85 int jpeg_full; /* Allow full color JPEG */
86 } tight_jpeg_conf[] = {
87 { 0, 8, 1, 1 },
88 { 0, 8, 1, 1 },
89 { 0, 8, 1, 1 },
90 { 0, 8, 1, 1 },
91 { 0, 10, 1, 1 },
92 { 0.1, 10, 1, 1 },
93 { 0.2, 10, 1, 1 },
94 { 0.3, 12, 0, 0 },
95 { 0.4, 14, 0, 0 },
96 { 0.5, 16, 0, 0 },
97 };
98 #endif
99
100 #ifdef CONFIG_VNC_PNG
101 static const struct {
102 int png_zlib_level, png_filters;
103 } tight_png_conf[] = {
104 { 0, PNG_NO_FILTERS },
105 { 1, PNG_NO_FILTERS },
106 { 2, PNG_NO_FILTERS },
107 { 3, PNG_NO_FILTERS },
108 { 4, PNG_NO_FILTERS },
109 { 5, PNG_ALL_FILTERS },
110 { 6, PNG_ALL_FILTERS },
111 { 7, PNG_ALL_FILTERS },
112 { 8, PNG_ALL_FILTERS },
113 { 9, PNG_ALL_FILTERS },
114 };
115
116 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
117 VncPalette *palette);
118
119 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
120 {
121 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
122 return false;
123 }
124
125 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
126 vs->client_pf.bytes_per_pixel == 1) {
127 return false;
128 }
129
130 return true;
131 }
132 #endif
133
134 /*
135 * Code to guess if given rectangle is suitable for smooth image
136 * compression (by applying "gradient" filter or JPEG coder).
137 */
138
139 static unsigned int
140 tight_detect_smooth_image24(VncState *vs, int w, int h)
141 {
142 int off;
143 int x, y, d, dx;
144 unsigned int c;
145 unsigned int stats[256];
146 int pixels = 0;
147 int pix, left[3];
148 unsigned int errors;
149 unsigned char *buf = vs->tight.tight.buffer;
150
151 /*
152 * If client is big-endian, color samples begin from the second
153 * byte (offset 1) of a 32-bit pixel value.
154 */
155 off = vs->client_be;
156
157 memset(stats, 0, sizeof (stats));
158
159 for (y = 0, x = 0; y < h && x < w;) {
160 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
161 d++) {
162 for (c = 0; c < 3; c++) {
163 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
164 }
165 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
166 for (c = 0; c < 3; c++) {
167 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
168 stats[abs(pix - left[c])]++;
169 left[c] = pix;
170 }
171 pixels++;
172 }
173 }
174 if (w > h) {
175 x += h;
176 y = 0;
177 } else {
178 x = 0;
179 y += w;
180 }
181 }
182
183 if (pixels == 0) {
184 return 0;
185 }
186
187 /* 95% smooth or more ... */
188 if (stats[0] * 33 / pixels >= 95) {
189 return 0;
190 }
191
192 errors = 0;
193 for (c = 1; c < 8; c++) {
194 errors += stats[c] * (c * c);
195 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
196 return 0;
197 }
198 }
199 for (; c < 256; c++) {
200 errors += stats[c] * (c * c);
201 }
202 errors /= (pixels * 3 - stats[0]);
203
204 return errors;
205 }
206
207 #define DEFINE_DETECT_FUNCTION(bpp) \
208 \
209 static unsigned int \
210 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \
211 bool endian; \
212 uint##bpp##_t pix; \
213 int max[3], shift[3]; \
214 int x, y, d, dx; \
215 unsigned int c; \
216 unsigned int stats[256]; \
217 int pixels = 0; \
218 int sample, sum, left[3]; \
219 unsigned int errors; \
220 unsigned char *buf = vs->tight.tight.buffer; \
221 \
222 endian = 0; /* FIXME */ \
223 \
224 \
225 max[0] = vs->client_pf.rmax; \
226 max[1] = vs->client_pf.gmax; \
227 max[2] = vs->client_pf.bmax; \
228 shift[0] = vs->client_pf.rshift; \
229 shift[1] = vs->client_pf.gshift; \
230 shift[2] = vs->client_pf.bshift; \
231 \
232 memset(stats, 0, sizeof(stats)); \
233 \
234 y = 0, x = 0; \
235 while (y < h && x < w) { \
236 for (d = 0; d < h - y && \
237 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \
238 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \
239 if (endian) { \
240 pix = bswap##bpp(pix); \
241 } \
242 for (c = 0; c < 3; c++) { \
243 left[c] = (int)(pix >> shift[c] & max[c]); \
244 } \
245 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \
246 dx++) { \
247 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \
248 if (endian) { \
249 pix = bswap##bpp(pix); \
250 } \
251 sum = 0; \
252 for (c = 0; c < 3; c++) { \
253 sample = (int)(pix >> shift[c] & max[c]); \
254 sum += abs(sample - left[c]); \
255 left[c] = sample; \
256 } \
257 if (sum > 255) { \
258 sum = 255; \
259 } \
260 stats[sum]++; \
261 pixels++; \
262 } \
263 } \
264 if (w > h) { \
265 x += h; \
266 y = 0; \
267 } else { \
268 x = 0; \
269 y += w; \
270 } \
271 } \
272 if (pixels == 0) { \
273 return 0; \
274 } \
275 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \
276 return 0; \
277 } \
278 \
279 errors = 0; \
280 for (c = 1; c < 8; c++) { \
281 errors += stats[c] * (c * c); \
282 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \
283 return 0; \
284 } \
285 } \
286 for (; c < 256; c++) { \
287 errors += stats[c] * (c * c); \
288 } \
289 errors /= (pixels - stats[0]); \
290 \
291 return errors; \
292 }
293
294 DEFINE_DETECT_FUNCTION(16)
295 DEFINE_DETECT_FUNCTION(32)
296
297 static int
298 tight_detect_smooth_image(VncState *vs, int w, int h)
299 {
300 unsigned int errors;
301 int compression = vs->tight.compression;
302 int quality = vs->tight.quality;
303
304 if (!vs->vd->lossy) {
305 return 0;
306 }
307
308 if (surface_bytes_per_pixel(vs->vd->ds) == 1 ||
309 vs->client_pf.bytes_per_pixel == 1 ||
310 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
311 return 0;
312 }
313
314 if (vs->tight.quality != (uint8_t)-1) {
315 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
316 return 0;
317 }
318 } else {
319 if (w * h < tight_conf[compression].gradient_min_rect_size) {
320 return 0;
321 }
322 }
323
324 if (vs->client_pf.bytes_per_pixel == 4) {
325 if (vs->tight.pixel24) {
326 errors = tight_detect_smooth_image24(vs, w, h);
327 if (vs->tight.quality != (uint8_t)-1) {
328 return (errors < tight_conf[quality].jpeg_threshold24);
329 }
330 return (errors < tight_conf[compression].gradient_threshold24);
331 } else {
332 errors = tight_detect_smooth_image32(vs, w, h);
333 }
334 } else {
335 errors = tight_detect_smooth_image16(vs, w, h);
336 }
337 if (quality != (uint8_t)-1) {
338 return (errors < tight_conf[quality].jpeg_threshold);
339 }
340 return (errors < tight_conf[compression].gradient_threshold);
341 }
342
343 /*
344 * Code to determine how many different colors used in rectangle.
345 */
346 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \
347 \
348 static int \
349 tight_fill_palette##bpp(VncState *vs, int x, int y, \
350 int max, size_t count, \
351 uint32_t *bg, uint32_t *fg, \
352 VncPalette *palette) { \
353 uint##bpp##_t *data; \
354 uint##bpp##_t c0, c1, ci; \
355 int i, n0, n1; \
356 \
357 data = (uint##bpp##_t *)vs->tight.tight.buffer; \
358 \
359 c0 = data[0]; \
360 i = 1; \
361 while (i < count && data[i] == c0) \
362 i++; \
363 if (i >= count) { \
364 *bg = *fg = c0; \
365 return 1; \
366 } \
367 \
368 if (max < 2) { \
369 return 0; \
370 } \
371 \
372 n0 = i; \
373 c1 = data[i]; \
374 n1 = 0; \
375 for (i++; i < count; i++) { \
376 ci = data[i]; \
377 if (ci == c0) { \
378 n0++; \
379 } else if (ci == c1) { \
380 n1++; \
381 } else \
382 break; \
383 } \
384 if (i >= count) { \
385 if (n0 > n1) { \
386 *bg = (uint32_t)c0; \
387 *fg = (uint32_t)c1; \
388 } else { \
389 *bg = (uint32_t)c1; \
390 *fg = (uint32_t)c0; \
391 } \
392 return 2; \
393 } \
394 \
395 if (max == 2) { \
396 return 0; \
397 } \
398 \
399 palette_init(palette, max, bpp); \
400 palette_put(palette, c0); \
401 palette_put(palette, c1); \
402 palette_put(palette, ci); \
403 \
404 for (i++; i < count; i++) { \
405 if (data[i] == ci) { \
406 continue; \
407 } else { \
408 ci = data[i]; \
409 if (!palette_put(palette, (uint32_t)ci)) { \
410 return 0; \
411 } \
412 } \
413 } \
414 \
415 return palette_size(palette); \
416 }
417
418 DEFINE_FILL_PALETTE_FUNCTION(8)
419 DEFINE_FILL_PALETTE_FUNCTION(16)
420 DEFINE_FILL_PALETTE_FUNCTION(32)
421
422 static int tight_fill_palette(VncState *vs, int x, int y,
423 size_t count, uint32_t *bg, uint32_t *fg,
424 VncPalette *palette)
425 {
426 int max;
427
428 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
429 if (max < 2 &&
430 count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
431 max = 2;
432 }
433 if (max >= 256) {
434 max = 256;
435 }
436
437 switch (vs->client_pf.bytes_per_pixel) {
438 case 4:
439 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
440 case 2:
441 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
442 default:
443 max = 2;
444 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
445 }
446 return 0;
447 }
448
449 /*
450 * Converting truecolor samples into palette indices.
451 */
452 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \
453 \
454 static void \
455 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \
456 VncPalette *palette) { \
457 uint##bpp##_t *src; \
458 uint##bpp##_t rgb; \
459 int i, rep; \
460 uint8_t idx; \
461 \
462 src = (uint##bpp##_t *) buf; \
463 \
464 for (i = 0; i < count; ) { \
465 \
466 rgb = *src++; \
467 i++; \
468 rep = 0; \
469 while (i < count && *src == rgb) { \
470 rep++, src++, i++; \
471 } \
472 idx = palette_idx(palette, rgb); \
473 /* \
474 * Should never happen, but don't break everything \
475 * if it does, use the first color instead \
476 */ \
477 if (idx == (uint8_t)-1) { \
478 idx = 0; \
479 } \
480 while (rep >= 0) { \
481 *buf++ = idx; \
482 rep--; \
483 } \
484 } \
485 }
486
487 DEFINE_IDX_ENCODE_FUNCTION(16)
488 DEFINE_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
541 DEFINE_MONO_ENCODE_FUNCTION(8)
542 DEFINE_MONO_ENCODE_FUNCTION(16)
543 DEFINE_MONO_ENCODE_FUNCTION(32)
544
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
551 static void
552 tight_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 (1 /* FIXME */) {
566 shift[0] = vs->client_pf.rshift;
567 shift[1] = vs->client_pf.gshift;
568 shift[2] = vs->client_pf.bshift;
569 } else {
570 shift[0] = 24 - vs->client_pf.rshift;
571 shift[1] = 24 - vs->client_pf.gshift;
572 shift[2] = 24 - vs->client_pf.bshift;
573 }
574
575 for (y = 0; y < h; y++) {
576 for (c = 0; c < 3; c++) {
577 upper[c] = 0;
578 here[c] = 0;
579 }
580 prev = (int *)vs->tight.gradient.buffer;
581 for (x = 0; x < w; x++) {
582 pix32 = *buf32++;
583 for (c = 0; c < 3; c++) {
584 upperleft[c] = upper[c];
585 left[c] = here[c];
586 upper[c] = *prev;
587 here[c] = (int)(pix32 >> shift[c] & 0xFF);
588 *prev++ = here[c];
589
590 prediction = left[c] + upper[c] - upperleft[c];
591 if (prediction < 0) {
592 prediction = 0;
593 } else if (prediction > 0xFF) {
594 prediction = 0xFF;
595 }
596 *buf++ = (char)(here[c] - prediction);
597 }
598 }
599 }
600 }
601
602
603 /*
604 * ``Gradient'' filter for other color depths.
605 */
606
607 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \
608 \
609 static void \
610 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \
611 int w, int h) { \
612 uint##bpp##_t pix, diff; \
613 bool endian; \
614 int *prev; \
615 int max[3], shift[3]; \
616 int here[3], upper[3], left[3], upperleft[3]; \
617 int prediction; \
618 int x, y, c; \
619 \
620 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \
621 \
622 endian = 0; /* FIXME */ \
623 \
624 max[0] = vs->client_pf.rmax; \
625 max[1] = vs->client_pf.gmax; \
626 max[2] = vs->client_pf.bmax; \
627 shift[0] = vs->client_pf.rshift; \
628 shift[1] = vs->client_pf.gshift; \
629 shift[2] = vs->client_pf.bshift; \
630 \
631 for (y = 0; y < h; y++) { \
632 for (c = 0; c < 3; c++) { \
633 upper[c] = 0; \
634 here[c] = 0; \
635 } \
636 prev = (int *)vs->tight.gradient.buffer; \
637 for (x = 0; x < w; x++) { \
638 pix = *buf; \
639 if (endian) { \
640 pix = bswap##bpp(pix); \
641 } \
642 diff = 0; \
643 for (c = 0; c < 3; c++) { \
644 upperleft[c] = upper[c]; \
645 left[c] = here[c]; \
646 upper[c] = *prev; \
647 here[c] = (int)(pix >> shift[c] & max[c]); \
648 *prev++ = here[c]; \
649 \
650 prediction = left[c] + upper[c] - upperleft[c]; \
651 if (prediction < 0) { \
652 prediction = 0; \
653 } else if (prediction > max[c]) { \
654 prediction = max[c]; \
655 } \
656 diff |= ((here[c] - prediction) & max[c]) \
657 << shift[c]; \
658 } \
659 if (endian) { \
660 diff = bswap##bpp(diff); \
661 } \
662 *buf++ = diff; \
663 } \
664 } \
665 }
666
667 DEFINE_GRADIENT_FILTER_FUNCTION(16)
668 DEFINE_GRADIENT_FILTER_FUNCTION(32)
669
670 /*
671 * Check if a rectangle is all of the same color. If needSameColor is
672 * set to non-zero, then also check that its color equals to the
673 * *colorPtr value. The result is 1 if the test is successful, and in
674 * that case new color will be stored in *colorPtr.
675 */
676
677 static bool
678 check_solid_tile32(VncState *vs, int x, int y, int w, int h,
679 uint32_t *color, bool samecolor)
680 {
681 VncDisplay *vd = vs->vd;
682 uint32_t *fbptr;
683 uint32_t c;
684 int dx, dy;
685
686 fbptr = vnc_server_fb_ptr(vd, x, y);
687
688 c = *fbptr;
689 if (samecolor && (uint32_t)c != *color) {
690 return false;
691 }
692
693 for (dy = 0; dy < h; dy++) {
694 for (dx = 0; dx < w; dx++) {
695 if (c != fbptr[dx]) {
696 return false;
697 }
698 }
699 fbptr = (uint32_t *)
700 ((uint8_t *)fbptr + vnc_server_fb_stride(vd));
701 }
702
703 *color = (uint32_t)c;
704 return true;
705 }
706
707 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
708 uint32_t* color, bool samecolor)
709 {
710 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4);
711 return check_solid_tile32(vs, x, y, w, h, color, samecolor);
712 }
713
714 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
715 uint32_t color, int *w_ptr, int *h_ptr)
716 {
717 int dx, dy, dw, dh;
718 int w_prev;
719 int w_best = 0, h_best = 0;
720
721 w_prev = w;
722
723 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
724
725 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
726 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
727
728 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
729 break;
730 }
731
732 for (dx = x + dw; dx < x + w_prev;) {
733 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
734
735 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
736 break;
737 }
738 dx += dw;
739 }
740
741 w_prev = dx - x;
742 if (w_prev * (dy + dh - y) > w_best * h_best) {
743 w_best = w_prev;
744 h_best = dy + dh - y;
745 }
746 }
747
748 *w_ptr = w_best;
749 *h_ptr = h_best;
750 }
751
752 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
753 uint32_t color, int *x_ptr, int *y_ptr,
754 int *w_ptr, int *h_ptr)
755 {
756 int cx, cy;
757
758 /* Try to extend the area upwards. */
759 for ( cy = *y_ptr - 1;
760 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
761 cy-- );
762 *h_ptr += *y_ptr - (cy + 1);
763 *y_ptr = cy + 1;
764
765 /* ... downwards. */
766 for ( cy = *y_ptr + *h_ptr;
767 cy < y + h &&
768 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
769 cy++ );
770 *h_ptr += cy - (*y_ptr + *h_ptr);
771
772 /* ... to the left. */
773 for ( cx = *x_ptr - 1;
774 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
775 cx-- );
776 *w_ptr += *x_ptr - (cx + 1);
777 *x_ptr = cx + 1;
778
779 /* ... to the right. */
780 for ( cx = *x_ptr + *w_ptr;
781 cx < x + w &&
782 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
783 cx++ );
784 *w_ptr += cx - (*x_ptr + *w_ptr);
785 }
786
787 static int tight_init_stream(VncState *vs, int stream_id,
788 int level, int strategy)
789 {
790 z_streamp zstream = &vs->tight.stream[stream_id];
791
792 if (zstream->opaque == NULL) {
793 int err;
794
795 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
796 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
797 zstream->zalloc = vnc_zlib_zalloc;
798 zstream->zfree = vnc_zlib_zfree;
799
800 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
801 MAX_MEM_LEVEL, strategy);
802
803 if (err != Z_OK) {
804 fprintf(stderr, "VNC: error initializing zlib\n");
805 return -1;
806 }
807
808 vs->tight.levels[stream_id] = level;
809 zstream->opaque = vs;
810 }
811
812 if (vs->tight.levels[stream_id] != level) {
813 if (deflateParams(zstream, level, strategy) != Z_OK) {
814 return -1;
815 }
816 vs->tight.levels[stream_id] = level;
817 }
818 return 0;
819 }
820
821 static void tight_send_compact_size(VncState *vs, size_t len)
822 {
823 int lpc = 0;
824 int bytes = 0;
825 char buf[3] = {0, 0, 0};
826
827 buf[bytes++] = len & 0x7F;
828 if (len > 0x7F) {
829 buf[bytes-1] |= 0x80;
830 buf[bytes++] = (len >> 7) & 0x7F;
831 if (len > 0x3FFF) {
832 buf[bytes-1] |= 0x80;
833 buf[bytes++] = (len >> 14) & 0xFF;
834 }
835 }
836 for (lpc = 0; lpc < bytes; lpc++) {
837 vnc_write_u8(vs, buf[lpc]);
838 }
839 }
840
841 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
842 int level, int strategy)
843 {
844 z_streamp zstream = &vs->tight.stream[stream_id];
845 int previous_out;
846
847 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
848 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
849 return bytes;
850 }
851
852 if (tight_init_stream(vs, stream_id, level, strategy)) {
853 return -1;
854 }
855
856 /* reserve memory in output buffer */
857 buffer_reserve(&vs->tight.zlib, bytes + 64);
858
859 /* set pointers */
860 zstream->next_in = vs->tight.tight.buffer;
861 zstream->avail_in = vs->tight.tight.offset;
862 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
863 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
864 previous_out = zstream->avail_out;
865 zstream->data_type = Z_BINARY;
866
867 /* start encoding */
868 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
869 fprintf(stderr, "VNC: error during tight compression\n");
870 return -1;
871 }
872
873 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
874 /* ...how much data has actually been produced by deflate() */
875 bytes = previous_out - zstream->avail_out;
876
877 tight_send_compact_size(vs, bytes);
878 vnc_write(vs, vs->tight.zlib.buffer, bytes);
879
880 buffer_reset(&vs->tight.zlib);
881
882 return bytes;
883 }
884
885 /*
886 * Subencoding implementations.
887 */
888 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
889 {
890 uint32_t *buf32;
891 uint32_t pix;
892 int rshift, gshift, bshift;
893
894 buf32 = (uint32_t *)buf;
895
896 if (1 /* FIXME */) {
897 rshift = vs->client_pf.rshift;
898 gshift = vs->client_pf.gshift;
899 bshift = vs->client_pf.bshift;
900 } else {
901 rshift = 24 - vs->client_pf.rshift;
902 gshift = 24 - vs->client_pf.gshift;
903 bshift = 24 - vs->client_pf.bshift;
904 }
905
906 if (ret) {
907 *ret = count * 3;
908 }
909
910 while (count--) {
911 pix = *buf32++;
912 *buf++ = (char)(pix >> rshift);
913 *buf++ = (char)(pix >> gshift);
914 *buf++ = (char)(pix >> bshift);
915 }
916 }
917
918 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
919 {
920 int stream = 0;
921 ssize_t bytes;
922
923 #ifdef CONFIG_VNC_PNG
924 if (tight_can_send_png_rect(vs, w, h)) {
925 return send_png_rect(vs, x, y, w, h, NULL);
926 }
927 #endif
928
929 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
930
931 if (vs->tight.pixel24) {
932 tight_pack24(vs, vs->tight.tight.buffer, w * h, &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 = ((w + 7) / 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 break;
1129 }
1130 bytes = w * h;
1131 vs->tight.tight.offset = bytes;
1132
1133 bytes = tight_compress_data(vs, stream, bytes,
1134 level, Z_DEFAULT_STRATEGY);
1135 return (bytes >= 0);
1136 }
1137
1138 /*
1139 * JPEG compression stuff.
1140 */
1141 #ifdef CONFIG_VNC_JPEG
1142 /*
1143 * Destination manager implementation for JPEG library.
1144 */
1145
1146 /* This is called once per encoding */
1147 static void jpeg_init_destination(j_compress_ptr cinfo)
1148 {
1149 VncState *vs = cinfo->client_data;
1150 Buffer *buffer = &vs->tight.jpeg;
1151
1152 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1153 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1154 }
1155
1156 /* This is called when we ran out of buffer (shouldn't happen!) */
1157 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1158 {
1159 VncState *vs = cinfo->client_data;
1160 Buffer *buffer = &vs->tight.jpeg;
1161
1162 buffer->offset = buffer->capacity;
1163 buffer_reserve(buffer, 2048);
1164 jpeg_init_destination(cinfo);
1165 return TRUE;
1166 }
1167
1168 /* This is called when we are done processing data */
1169 static void jpeg_term_destination(j_compress_ptr cinfo)
1170 {
1171 VncState *vs = cinfo->client_data;
1172 Buffer *buffer = &vs->tight.jpeg;
1173
1174 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1175 }
1176
1177 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1178 {
1179 struct jpeg_compress_struct cinfo;
1180 struct jpeg_error_mgr jerr;
1181 struct jpeg_destination_mgr manager;
1182 pixman_image_t *linebuf;
1183 JSAMPROW row[1];
1184 uint8_t *buf;
1185 int dy;
1186
1187 if (surface_bytes_per_pixel(vs->vd->ds) == 1) {
1188 return send_full_color_rect(vs, x, y, w, h);
1189 }
1190
1191 buffer_reserve(&vs->tight.jpeg, 2048);
1192
1193 cinfo.err = jpeg_std_error(&jerr);
1194 jpeg_create_compress(&cinfo);
1195
1196 cinfo.client_data = vs;
1197 cinfo.image_width = w;
1198 cinfo.image_height = h;
1199 cinfo.input_components = 3;
1200 cinfo.in_color_space = JCS_RGB;
1201
1202 jpeg_set_defaults(&cinfo);
1203 jpeg_set_quality(&cinfo, quality, true);
1204
1205 manager.init_destination = jpeg_init_destination;
1206 manager.empty_output_buffer = jpeg_empty_output_buffer;
1207 manager.term_destination = jpeg_term_destination;
1208 cinfo.dest = &manager;
1209
1210 jpeg_start_compress(&cinfo, true);
1211
1212 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1213 buf = (uint8_t *)pixman_image_get_data(linebuf);
1214 row[0] = buf;
1215 for (dy = 0; dy < h; dy++) {
1216 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1217 jpeg_write_scanlines(&cinfo, row, 1);
1218 }
1219 qemu_pixman_image_unref(linebuf);
1220
1221 jpeg_finish_compress(&cinfo);
1222 jpeg_destroy_compress(&cinfo);
1223
1224 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1225
1226 tight_send_compact_size(vs, vs->tight.jpeg.offset);
1227 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset);
1228 buffer_reset(&vs->tight.jpeg);
1229
1230 return 1;
1231 }
1232 #endif /* CONFIG_VNC_JPEG */
1233
1234 /*
1235 * PNG compression stuff.
1236 */
1237 #ifdef CONFIG_VNC_PNG
1238 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1239 {
1240 struct palette_cb_priv *priv = opaque;
1241 VncState *vs = priv->vs;
1242 png_colorp color = &priv->png_palette[idx];
1243
1244 if (vs->tight.pixel24)
1245 {
1246 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1247 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1248 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1249 }
1250 else
1251 {
1252 int red, green, blue;
1253
1254 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax;
1255 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax;
1256 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax;
1257 color->red = ((red * 255 + vs->client_pf.rmax / 2) /
1258 vs->client_pf.rmax);
1259 color->green = ((green * 255 + vs->client_pf.gmax / 2) /
1260 vs->client_pf.gmax);
1261 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) /
1262 vs->client_pf.bmax);
1263 }
1264 }
1265
1266 static void png_write_data(png_structp png_ptr, png_bytep data,
1267 png_size_t length)
1268 {
1269 VncState *vs = png_get_io_ptr(png_ptr);
1270
1271 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length);
1272 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length);
1273
1274 vs->tight.png.offset += length;
1275 }
1276
1277 static void png_flush_data(png_structp png_ptr)
1278 {
1279 }
1280
1281 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1282 {
1283 return g_malloc(size);
1284 }
1285
1286 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1287 {
1288 g_free(ptr);
1289 }
1290
1291 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1292 VncPalette *palette)
1293 {
1294 png_byte color_type;
1295 png_structp png_ptr;
1296 png_infop info_ptr;
1297 png_colorp png_palette = NULL;
1298 pixman_image_t *linebuf;
1299 int level = tight_png_conf[vs->tight.compression].png_zlib_level;
1300 int filters = tight_png_conf[vs->tight.compression].png_filters;
1301 uint8_t *buf;
1302 int dy;
1303
1304 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1305 NULL, vnc_png_malloc, vnc_png_free);
1306
1307 if (png_ptr == NULL)
1308 return -1;
1309
1310 info_ptr = png_create_info_struct(png_ptr);
1311
1312 if (info_ptr == NULL) {
1313 png_destroy_write_struct(&png_ptr, NULL);
1314 return -1;
1315 }
1316
1317 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1318 png_set_compression_level(png_ptr, level);
1319 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1320
1321 if (palette) {
1322 color_type = PNG_COLOR_TYPE_PALETTE;
1323 } else {
1324 color_type = PNG_COLOR_TYPE_RGB;
1325 }
1326
1327 png_set_IHDR(png_ptr, info_ptr, w, h,
1328 8, color_type, PNG_INTERLACE_NONE,
1329 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1330
1331 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1332 struct palette_cb_priv priv;
1333
1334 png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1335 palette_size(palette));
1336
1337 priv.vs = vs;
1338 priv.png_palette = png_palette;
1339 palette_iter(palette, write_png_palette, &priv);
1340
1341 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1342
1343 if (vs->client_pf.bytes_per_pixel == 4) {
1344 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1345 } else {
1346 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1347 }
1348 }
1349
1350 png_write_info(png_ptr, info_ptr);
1351
1352 buffer_reserve(&vs->tight.png, 2048);
1353 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w);
1354 buf = (uint8_t *)pixman_image_get_data(linebuf);
1355 for (dy = 0; dy < h; dy++)
1356 {
1357 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1358 memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1359 } else {
1360 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy);
1361 }
1362 png_write_row(png_ptr, buf);
1363 }
1364 qemu_pixman_image_unref(linebuf);
1365
1366 png_write_end(png_ptr, NULL);
1367
1368 if (color_type == PNG_COLOR_TYPE_PALETTE) {
1369 png_free(png_ptr, png_palette);
1370 }
1371
1372 png_destroy_write_struct(&png_ptr, &info_ptr);
1373
1374 vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1375
1376 tight_send_compact_size(vs, vs->tight.png.offset);
1377 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1378 buffer_reset(&vs->tight.png);
1379 return 1;
1380 }
1381 #endif /* CONFIG_VNC_PNG */
1382
1383 static void vnc_tight_start(VncState *vs)
1384 {
1385 buffer_reset(&vs->tight.tight);
1386
1387 // make the output buffer be the zlib buffer, so we can compress it later
1388 vs->tight.tmp = vs->output;
1389 vs->output = vs->tight.tight;
1390 }
1391
1392 static void vnc_tight_stop(VncState *vs)
1393 {
1394 // switch back to normal output/zlib buffers
1395 vs->tight.tight = vs->output;
1396 vs->output = vs->tight.tmp;
1397 }
1398
1399 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1400 int bg, int fg, int colors, VncPalette *palette)
1401 {
1402 int ret;
1403
1404 if (colors == 0) {
1405 if (tight_detect_smooth_image(vs, w, h)) {
1406 ret = send_gradient_rect(vs, x, y, w, h);
1407 } else {
1408 ret = send_full_color_rect(vs, x, y, w, h);
1409 }
1410 } else if (colors == 1) {
1411 ret = send_solid_rect(vs);
1412 } else if (colors == 2) {
1413 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1414 } else if (colors <= 256) {
1415 ret = send_palette_rect(vs, x, y, w, h, palette);
1416 } else {
1417 ret = 0;
1418 }
1419 return ret;
1420 }
1421
1422 #ifdef CONFIG_VNC_JPEG
1423 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1424 int bg, int fg, int colors,
1425 VncPalette *palette, bool force)
1426 {
1427 int ret;
1428
1429 if (colors == 0) {
1430 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full &&
1431 tight_detect_smooth_image(vs, w, h))) {
1432 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1433
1434 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1435 } else {
1436 ret = send_full_color_rect(vs, x, y, w, h);
1437 }
1438 } else if (colors == 1) {
1439 ret = send_solid_rect(vs);
1440 } else if (colors == 2) {
1441 ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1442 } else if (colors <= 256) {
1443 if (force || (colors > 96 &&
1444 tight_jpeg_conf[vs->tight.quality].jpeg_idx &&
1445 tight_detect_smooth_image(vs, w, h))) {
1446 int quality = tight_conf[vs->tight.quality].jpeg_quality;
1447
1448 ret = send_jpeg_rect(vs, x, y, w, h, quality);
1449 } else {
1450 ret = send_palette_rect(vs, x, y, w, h, palette);
1451 }
1452 } else {
1453 ret = 0;
1454 }
1455 return ret;
1456 }
1457 #endif
1458
1459 static __thread VncPalette *color_count_palette;
1460 static __thread Notifier vnc_tight_cleanup_notifier;
1461
1462 static void vnc_tight_cleanup(Notifier *n, void *value)
1463 {
1464 g_free(color_count_palette);
1465 color_count_palette = NULL;
1466 }
1467
1468 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1469 {
1470 uint32_t bg = 0, fg = 0;
1471 int colors;
1472 int ret = 0;
1473 #ifdef CONFIG_VNC_JPEG
1474 bool force_jpeg = false;
1475 bool allow_jpeg = true;
1476 #endif
1477
1478 if (!color_count_palette) {
1479 color_count_palette = g_malloc(sizeof(VncPalette));
1480 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup;
1481 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier);
1482 }
1483
1484 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1485
1486 vnc_tight_start(vs);
1487 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1488 vnc_tight_stop(vs);
1489
1490 #ifdef CONFIG_VNC_JPEG
1491 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) {
1492 double freq = vnc_update_freq(vs, x, y, w, h);
1493
1494 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) {
1495 allow_jpeg = false;
1496 }
1497 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1498 force_jpeg = true;
1499 vnc_sent_lossy_rect(vs, x, y, w, h);
1500 }
1501 }
1502 #endif
1503
1504 colors = tight_fill_palette(vs, x, y, w * h, &bg, &fg, color_count_palette);
1505
1506 #ifdef CONFIG_VNC_JPEG
1507 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) {
1508 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors,
1509 color_count_palette, force_jpeg);
1510 } else {
1511 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1512 color_count_palette);
1513 }
1514 #else
1515 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors,
1516 color_count_palette);
1517 #endif
1518
1519 return ret;
1520 }
1521
1522 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1523 {
1524 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1525
1526 vnc_tight_start(vs);
1527 vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1528 vnc_tight_stop(vs);
1529
1530 return send_solid_rect(vs);
1531 }
1532
1533 static int send_rect_simple(VncState *vs, int x, int y, int w, int h,
1534 bool split)
1535 {
1536 int max_size, max_width;
1537 int max_sub_width, max_sub_height;
1538 int dx, dy;
1539 int rw, rh;
1540 int n = 0;
1541
1542 max_size = tight_conf[vs->tight.compression].max_rect_size;
1543 max_width = tight_conf[vs->tight.compression].max_rect_width;
1544
1545 if (split && (w > max_width || w * h > max_size)) {
1546 max_sub_width = (w > max_width) ? max_width : w;
1547 max_sub_height = max_size / max_sub_width;
1548
1549 for (dy = 0; dy < h; dy += max_sub_height) {
1550 for (dx = 0; dx < w; dx += max_width) {
1551 rw = MIN(max_sub_width, w - dx);
1552 rh = MIN(max_sub_height, h - dy);
1553 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1554 }
1555 }
1556 } else {
1557 n += send_sub_rect(vs, x, y, w, h);
1558 }
1559
1560 return n;
1561 }
1562
1563 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1564 int w, int h, int max_rows)
1565 {
1566 int dx, dy, dw, dh;
1567 int n = 0;
1568
1569 /* Try to find large solid-color areas and send them separately. */
1570
1571 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1572
1573 /* If a rectangle becomes too large, send its upper part now. */
1574
1575 if (dy - y >= max_rows) {
1576 n += send_rect_simple(vs, x, y, w, max_rows, true);
1577 y += max_rows;
1578 h -= max_rows;
1579 }
1580
1581 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1582
1583 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1584 uint32_t color_value;
1585 int x_best, y_best, w_best, h_best;
1586
1587 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1588
1589 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1590 continue ;
1591 }
1592
1593 /* Get dimensions of solid-color area. */
1594
1595 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1596 color_value, &w_best, &h_best);
1597
1598 /* Make sure a solid rectangle is large enough
1599 (or the whole rectangle is of the same color). */
1600
1601 if (w_best * h_best != w * h &&
1602 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1603 continue;
1604 }
1605
1606 /* Try to extend solid rectangle to maximum size. */
1607
1608 x_best = dx; y_best = dy;
1609 extend_solid_area(vs, x, y, w, h, color_value,
1610 &x_best, &y_best, &w_best, &h_best);
1611
1612 /* Send rectangles at top and left to solid-color area. */
1613
1614 if (y_best != y) {
1615 n += send_rect_simple(vs, x, y, w, y_best-y, true);
1616 }
1617 if (x_best != x) {
1618 n += tight_send_framebuffer_update(vs, x, y_best,
1619 x_best-x, h_best);
1620 }
1621
1622 /* Send solid-color rectangle. */
1623 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1624
1625 /* Send remaining rectangles (at right and bottom). */
1626
1627 if (x_best + w_best != x + w) {
1628 n += tight_send_framebuffer_update(vs, x_best+w_best,
1629 y_best,
1630 w-(x_best-x)-w_best,
1631 h_best);
1632 }
1633 if (y_best + h_best != y + h) {
1634 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1635 w, h-(y_best-y)-h_best);
1636 }
1637
1638 /* Return after all recursive calls are done. */
1639 return n;
1640 }
1641 }
1642 return n + send_rect_simple(vs, x, y, w, h, true);
1643 }
1644
1645 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1646 int w, int h)
1647 {
1648 int max_rows;
1649
1650 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF &&
1651 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) {
1652 vs->tight.pixel24 = true;
1653 } else {
1654 vs->tight.pixel24 = false;
1655 }
1656
1657 #ifdef CONFIG_VNC_JPEG
1658 if (vs->tight.quality != (uint8_t)-1) {
1659 double freq = vnc_update_freq(vs, x, y, w, h);
1660
1661 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) {
1662 return send_rect_simple(vs, x, y, w, h, false);
1663 }
1664 }
1665 #endif
1666
1667 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) {
1668 return send_rect_simple(vs, x, y, w, h, true);
1669 }
1670
1671 /* Calculate maximum number of rows in one non-solid rectangle. */
1672
1673 max_rows = tight_conf[vs->tight.compression].max_rect_size;
1674 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1675
1676 return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1677 }
1678
1679 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1680 int w, int h)
1681 {
1682 vs->tight.type = VNC_ENCODING_TIGHT;
1683 return tight_send_framebuffer_update(vs, x, y, w, h);
1684 }
1685
1686 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1687 int w, int h)
1688 {
1689 vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1690 return tight_send_framebuffer_update(vs, x, y, w, h);
1691 }
1692
1693 void vnc_tight_clear(VncState *vs)
1694 {
1695 int i;
1696 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1697 if (vs->tight.stream[i].opaque) {
1698 deflateEnd(&vs->tight.stream[i]);
1699 }
1700 }
1701
1702 buffer_free(&vs->tight.tight);
1703 buffer_free(&vs->tight.zlib);
1704 buffer_free(&vs->tight.gradient);
1705 #ifdef CONFIG_VNC_JPEG
1706 buffer_free(&vs->tight.jpeg);
1707 #endif
1708 #ifdef CONFIG_VNC_PNG
1709 buffer_free(&vs->tight.png);
1710 #endif
1711 }
AR7 emulation for QEMU