1 /* 2 * QEMU VNC display driver: tight encoding 3 * 4 * From libvncserver/libvncserver/tight.c 5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved. 6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. 7 * 8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com> 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a copy 11 * of this software and associated documentation files (the "Software"), to deal 12 * in the Software without restriction, including without limitation the rights 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 14 * copies of the Software, and to permit persons to whom the Software is 15 * furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be included in 18 * all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 26 * THE SOFTWARE. 27 */ 28 29 #include "qemu/osdep.h" 30 31 /* This needs to be before jpeglib.h line because of conflict with 32 INT32 definitions between jmorecfg.h (included by jpeglib.h) and 33 Win32 basetsd.h (included by windows.h). */ 34 35 #ifdef CONFIG_PNG 36 /* The following define is needed by pngconf.h. Otherwise it won't compile, 37 because setjmp.h was already included by osdep.h. */ 38 #define PNG_SKIP_SETJMP_CHECK 39 #include <png.h> 40 #endif 41 #ifdef CONFIG_VNC_JPEG 42 #include <jpeglib.h> 43 #endif 44 45 #include "qemu/bswap.h" 46 #include "vnc.h" 47 #include "vnc-enc-tight.h" 48 #include "vnc-palette.h" 49 50 /* Compression level stuff. The following array contains various 51 encoder parameters for each of 10 compression levels (0..9). 52 Last three parameters correspond to JPEG quality levels (0..9). */ 53 54 static const struct { 55 int max_rect_size, max_rect_width; 56 int mono_min_rect_size, gradient_min_rect_size; 57 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; 58 int gradient_threshold, gradient_threshold24; 59 int idx_max_colors_divisor; 60 int jpeg_quality, jpeg_threshold, jpeg_threshold24; 61 } tight_conf[] = { 62 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, 63 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, 64 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, 65 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, 66 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, 67 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, 68 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, 69 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, 70 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, 71 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } 72 }; 73 74 75 static int tight_send_framebuffer_update(VncState *vs, VncWorker *worker, 76 int x, int y, int w, int h); 77 78 #ifdef CONFIG_VNC_JPEG 79 static const struct { 80 double jpeg_freq_min; /* Don't send JPEG if the freq is below */ 81 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */ 82 int jpeg_idx; /* Allow indexed JPEG */ 83 int jpeg_full; /* Allow full color JPEG */ 84 } tight_jpeg_conf[] = { 85 { 0, 8, 1, 1 }, 86 { 0, 8, 1, 1 }, 87 { 0, 8, 1, 1 }, 88 { 0, 8, 1, 1 }, 89 { 0, 10, 1, 1 }, 90 { 0.1, 10, 1, 1 }, 91 { 0.2, 10, 1, 1 }, 92 { 0.3, 12, 0, 0 }, 93 { 0.4, 14, 0, 0 }, 94 { 0.5, 16, 0, 0 }, 95 }; 96 #endif 97 98 #ifdef CONFIG_PNG 99 static const struct { 100 int png_zlib_level, png_filters; 101 } tight_png_conf[] = { 102 { 0, PNG_NO_FILTERS }, 103 { 1, PNG_NO_FILTERS }, 104 { 2, PNG_NO_FILTERS }, 105 { 3, PNG_NO_FILTERS }, 106 { 4, PNG_NO_FILTERS }, 107 { 5, PNG_ALL_FILTERS }, 108 { 6, PNG_ALL_FILTERS }, 109 { 7, PNG_ALL_FILTERS }, 110 { 8, PNG_ALL_FILTERS }, 111 { 9, PNG_ALL_FILTERS }, 112 }; 113 114 static int send_png_rect(VncState *vs, VncWorker *worker, 115 int x, int y, int w, int h, VncPalette *palette); 116 117 static bool tight_can_send_png_rect(VncState *vs, VncTight *tight, int w, int h) 118 { 119 if (tight->type != VNC_ENCODING_TIGHT_PNG) { 120 return false; 121 } 122 123 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 124 vs->client_pf.bytes_per_pixel == 1) { 125 return false; 126 } 127 128 return true; 129 } 130 #endif 131 132 /* 133 * Code to guess if given rectangle is suitable for smooth image 134 * compression (by applying "gradient" filter or JPEG coder). 135 */ 136 137 static unsigned int 138 tight_detect_smooth_image24(VncState *vs, VncTight *tight, int w, int h) 139 { 140 int off; 141 int x, y, d, dx; 142 unsigned int c; 143 unsigned int stats[256]; 144 int pixels = 0; 145 int pix, left[3]; 146 unsigned int errors; 147 unsigned char *buf = tight->tight.buffer; 148 149 /* 150 * If client is big-endian, color samples begin from the second 151 * byte (offset 1) of a 32-bit pixel value. 152 */ 153 off = vs->client_endian == G_BIG_ENDIAN ? 1 : 0; 154 155 memset(stats, 0, sizeof (stats)); 156 157 for (y = 0, x = 0; y < h && x < w;) { 158 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; 159 d++) { 160 for (c = 0; c < 3; c++) { 161 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; 162 } 163 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { 164 for (c = 0; c < 3; c++) { 165 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; 166 stats[abs(pix - left[c])]++; 167 left[c] = pix; 168 } 169 pixels++; 170 } 171 } 172 if (w > h) { 173 x += h; 174 y = 0; 175 } else { 176 x = 0; 177 y += w; 178 } 179 } 180 181 if (pixels == 0) { 182 return 0; 183 } 184 185 /* 95% smooth or more ... */ 186 if (stats[0] * 33 / pixels >= 95) { 187 return 0; 188 } 189 190 errors = 0; 191 for (c = 1; c < 8; c++) { 192 errors += stats[c] * (c * c); 193 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 194 return 0; 195 } 196 } 197 for (; c < 256; c++) { 198 errors += stats[c] * (c * c); 199 } 200 errors /= (pixels * 3 - stats[0]); 201 202 return errors; 203 } 204 205 #define DEFINE_DETECT_FUNCTION(bpp) \ 206 \ 207 static unsigned int \ 208 tight_detect_smooth_image##bpp(VncState *vs, VncTight *tight, \ 209 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 = 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, VncTight *tight, int w, int h) 298 { 299 unsigned int errors; 300 int compression = tight->compression; 301 int quality = 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 (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 (tight->pixel24) { 325 errors = tight_detect_smooth_image24(vs, tight, w, h); 326 if (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, tight, w, h); 332 } 333 } else { 334 errors = tight_detect_smooth_image16(vs, tight, 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, VncTight *tight, \ 349 int x, int y, 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 *)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, VncTight *tight, 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[tight->compression].idx_max_colors_divisor; 428 if (max < 2 && 429 count >= tight_conf[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, tight, x, y, max, count, bg, fg, 439 palette); 440 case 2: 441 return tight_fill_palette16(vs, tight, x, y, max, count, bg, fg, 442 palette); 443 default: 444 max = 2; 445 return tight_fill_palette8(vs, tight, x, y, max, count, bg, fg, 446 palette); 447 } 448 return 0; 449 } 450 451 /* 452 * Converting truecolor samples into palette indices. 453 */ 454 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 455 \ 456 static void \ 457 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 458 VncPalette *palette) { \ 459 uint##bpp##_t *src; \ 460 uint##bpp##_t rgb; \ 461 int i, rep; \ 462 uint8_t idx; \ 463 \ 464 src = (uint##bpp##_t *) buf; \ 465 \ 466 for (i = 0; i < count; ) { \ 467 \ 468 rgb = *src++; \ 469 i++; \ 470 rep = 0; \ 471 while (i < count && *src == rgb) { \ 472 rep++, src++, i++; \ 473 } \ 474 idx = palette_idx(palette, rgb); \ 475 /* \ 476 * Should never happen, but don't break everything \ 477 * if it does, use the first color instead \ 478 */ \ 479 if (idx == (uint8_t)-1) { \ 480 idx = 0; \ 481 } \ 482 while (rep >= 0) { \ 483 *buf++ = idx; \ 484 rep--; \ 485 } \ 486 } \ 487 } 488 489 DEFINE_IDX_ENCODE_FUNCTION(16) 490 DEFINE_IDX_ENCODE_FUNCTION(32) 491 492 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 493 \ 494 static void \ 495 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 496 uint##bpp##_t bg, uint##bpp##_t fg) { \ 497 uint##bpp##_t *ptr; \ 498 unsigned int value, mask; \ 499 int aligned_width; \ 500 int x, y, bg_bits; \ 501 \ 502 ptr = (uint##bpp##_t *) buf; \ 503 aligned_width = w - w % 8; \ 504 \ 505 for (y = 0; y < h; y++) { \ 506 for (x = 0; x < aligned_width; x += 8) { \ 507 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 508 if (*ptr++ != bg) { \ 509 break; \ 510 } \ 511 } \ 512 if (bg_bits == 8) { \ 513 *buf++ = 0; \ 514 continue; \ 515 } \ 516 mask = 0x80 >> bg_bits; \ 517 value = mask; \ 518 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 519 mask >>= 1; \ 520 if (*ptr++ != bg) { \ 521 value |= mask; \ 522 } \ 523 } \ 524 *buf++ = (uint8_t)value; \ 525 } \ 526 \ 527 mask = 0x80; \ 528 value = 0; \ 529 if (x >= w) { \ 530 continue; \ 531 } \ 532 \ 533 for (; x < w; x++) { \ 534 if (*ptr++ != bg) { \ 535 value |= mask; \ 536 } \ 537 mask >>= 1; \ 538 } \ 539 *buf++ = (uint8_t)value; \ 540 } \ 541 } 542 543 DEFINE_MONO_ENCODE_FUNCTION(8) 544 DEFINE_MONO_ENCODE_FUNCTION(16) 545 DEFINE_MONO_ENCODE_FUNCTION(32) 546 547 /* 548 * ``Gradient'' filter for 24-bit color samples. 549 * Should be called only when redMax, greenMax and blueMax are 255. 550 * Color components assumed to be byte-aligned. 551 */ 552 553 static void 554 tight_filter_gradient24(VncState *vs, VncTight *tight, uint8_t *buf, 555 int w, int h) 556 { 557 uint32_t *buf32; 558 uint32_t pix32; 559 int shift[3]; 560 int *prev; 561 int here[3], upper[3], left[3], upperleft[3]; 562 int prediction; 563 int x, y, c; 564 565 buf32 = (uint32_t *)buf; 566 memset(tight->gradient.buffer, 0, w * 3 * sizeof(int)); 567 568 if (1 /* FIXME */) { 569 shift[0] = vs->client_pf.rshift; 570 shift[1] = vs->client_pf.gshift; 571 shift[2] = vs->client_pf.bshift; 572 } else { 573 shift[0] = 24 - vs->client_pf.rshift; 574 shift[1] = 24 - vs->client_pf.gshift; 575 shift[2] = 24 - vs->client_pf.bshift; 576 } 577 578 for (y = 0; y < h; y++) { 579 for (c = 0; c < 3; c++) { 580 upper[c] = 0; 581 here[c] = 0; 582 } 583 prev = (int *)tight->gradient.buffer; 584 for (x = 0; x < w; x++) { 585 pix32 = *buf32++; 586 for (c = 0; c < 3; c++) { 587 upperleft[c] = upper[c]; 588 left[c] = here[c]; 589 upper[c] = *prev; 590 here[c] = (int)(pix32 >> shift[c] & 0xFF); 591 *prev++ = here[c]; 592 593 prediction = left[c] + upper[c] - upperleft[c]; 594 if (prediction < 0) { 595 prediction = 0; 596 } else if (prediction > 0xFF) { 597 prediction = 0xFF; 598 } 599 *buf++ = (char)(here[c] - prediction); 600 } 601 } 602 } 603 } 604 605 606 /* 607 * ``Gradient'' filter for other color depths. 608 */ 609 610 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 611 \ 612 static void \ 613 tight_filter_gradient##bpp(VncState *vs, VncTight *tight, \ 614 uint##bpp##_t *buf, int w, int h) { \ 615 uint##bpp##_t pix, diff; \ 616 bool endian; \ 617 int *prev; \ 618 int max[3], shift[3]; \ 619 int here[3], upper[3], left[3], upperleft[3]; \ 620 int prediction; \ 621 int x, y, c; \ 622 \ 623 memset(tight->gradient.buffer, 0, w * 3 * sizeof(int)); \ 624 \ 625 endian = 0; /* FIXME */ \ 626 \ 627 max[0] = vs->client_pf.rmax; \ 628 max[1] = vs->client_pf.gmax; \ 629 max[2] = vs->client_pf.bmax; \ 630 shift[0] = vs->client_pf.rshift; \ 631 shift[1] = vs->client_pf.gshift; \ 632 shift[2] = vs->client_pf.bshift; \ 633 \ 634 for (y = 0; y < h; y++) { \ 635 for (c = 0; c < 3; c++) { \ 636 upper[c] = 0; \ 637 here[c] = 0; \ 638 } \ 639 prev = (int *)tight->gradient.buffer; \ 640 for (x = 0; x < w; x++) { \ 641 pix = *buf; \ 642 if (endian) { \ 643 pix = bswap##bpp(pix); \ 644 } \ 645 diff = 0; \ 646 for (c = 0; c < 3; c++) { \ 647 upperleft[c] = upper[c]; \ 648 left[c] = here[c]; \ 649 upper[c] = *prev; \ 650 here[c] = (int)(pix >> shift[c] & max[c]); \ 651 *prev++ = here[c]; \ 652 \ 653 prediction = left[c] + upper[c] - upperleft[c]; \ 654 if (prediction < 0) { \ 655 prediction = 0; \ 656 } else if (prediction > max[c]) { \ 657 prediction = max[c]; \ 658 } \ 659 diff |= ((here[c] - prediction) & max[c]) \ 660 << shift[c]; \ 661 } \ 662 if (endian) { \ 663 diff = bswap##bpp(diff); \ 664 } \ 665 *buf++ = diff; \ 666 } \ 667 } \ 668 } 669 670 DEFINE_GRADIENT_FILTER_FUNCTION(16) 671 DEFINE_GRADIENT_FILTER_FUNCTION(32) 672 673 /* 674 * Check if a rectangle is all of the same color. If needSameColor is 675 * set to non-zero, then also check that its color equals to the 676 * *colorPtr value. The result is 1 if the test is successful, and in 677 * that case new color will be stored in *colorPtr. 678 */ 679 680 static bool 681 check_solid_tile32(VncState *vs, int x, int y, int w, int h, 682 uint32_t *color, bool samecolor) 683 { 684 VncDisplay *vd = vs->vd; 685 uint32_t *fbptr; 686 uint32_t c; 687 int dx, dy; 688 689 fbptr = vnc_server_fb_ptr(vd, x, y); 690 691 c = *fbptr; 692 if (samecolor && (uint32_t)c != *color) { 693 return false; 694 } 695 696 for (dy = 0; dy < h; dy++) { 697 for (dx = 0; dx < w; dx++) { 698 if (c != fbptr[dx]) { 699 return false; 700 } 701 } 702 fbptr = (uint32_t *) 703 ((uint8_t *)fbptr + vnc_server_fb_stride(vd)); 704 } 705 706 *color = (uint32_t)c; 707 return true; 708 } 709 710 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 711 uint32_t* color, bool samecolor) 712 { 713 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4); 714 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 715 } 716 717 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 718 uint32_t color, int *w_ptr, int *h_ptr) 719 { 720 int dx, dy, dw, dh; 721 int w_prev; 722 int w_best = 0, h_best = 0; 723 724 w_prev = w; 725 726 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 727 728 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 729 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 730 731 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 732 break; 733 } 734 735 for (dx = x + dw; dx < x + w_prev;) { 736 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 737 738 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 739 break; 740 } 741 dx += dw; 742 } 743 744 w_prev = dx - x; 745 if (w_prev * (dy + dh - y) > w_best * h_best) { 746 w_best = w_prev; 747 h_best = dy + dh - y; 748 } 749 } 750 751 *w_ptr = w_best; 752 *h_ptr = h_best; 753 } 754 755 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 756 uint32_t color, int *x_ptr, int *y_ptr, 757 int *w_ptr, int *h_ptr) 758 { 759 int cx, cy; 760 761 /* Try to extend the area upwards. */ 762 for ( cy = *y_ptr - 1; 763 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 764 cy-- ); 765 *h_ptr += *y_ptr - (cy + 1); 766 *y_ptr = cy + 1; 767 768 /* ... downwards. */ 769 for ( cy = *y_ptr + *h_ptr; 770 cy < y + h && 771 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 772 cy++ ); 773 *h_ptr += cy - (*y_ptr + *h_ptr); 774 775 /* ... to the left. */ 776 for ( cx = *x_ptr - 1; 777 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 778 cx-- ); 779 *w_ptr += *x_ptr - (cx + 1); 780 *x_ptr = cx + 1; 781 782 /* ... to the right. */ 783 for ( cx = *x_ptr + *w_ptr; 784 cx < x + w && 785 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 786 cx++ ); 787 *w_ptr += cx - (*x_ptr + *w_ptr); 788 } 789 790 static int tight_init_stream(VncState *vs, VncTight *tight, int stream_id, 791 int level, int strategy) 792 { 793 z_streamp zstream = &tight->stream[stream_id]; 794 795 if (zstream->opaque == NULL) { 796 int err; 797 798 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 799 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 800 zstream->zalloc = vnc_zlib_zalloc; 801 zstream->zfree = vnc_zlib_zfree; 802 803 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 804 MAX_MEM_LEVEL, strategy); 805 806 if (err != Z_OK) { 807 fprintf(stderr, "VNC: error initializing zlib\n"); 808 return -1; 809 } 810 811 tight->levels[stream_id] = level; 812 zstream->opaque = vs; 813 } 814 815 if (tight->levels[stream_id] != level) { 816 if (deflateParams(zstream, level, strategy) != Z_OK) { 817 return -1; 818 } 819 tight->levels[stream_id] = level; 820 } 821 return 0; 822 } 823 824 static void tight_send_compact_size(VncState *vs, size_t len) 825 { 826 int lpc = 0; 827 int bytes = 0; 828 char buf[3] = {0, 0, 0}; 829 830 buf[bytes++] = len & 0x7F; 831 if (len > 0x7F) { 832 buf[bytes-1] |= 0x80; 833 buf[bytes++] = (len >> 7) & 0x7F; 834 if (len > 0x3FFF) { 835 buf[bytes-1] |= 0x80; 836 buf[bytes++] = (len >> 14) & 0xFF; 837 } 838 } 839 for (lpc = 0; lpc < bytes; lpc++) { 840 vnc_write_u8(vs, buf[lpc]); 841 } 842 } 843 844 static int tight_compress_data(VncState *vs, VncTight *tight, int stream_id, 845 size_t bytes, int level, int strategy) 846 { 847 z_streamp zstream = &tight->stream[stream_id]; 848 int previous_out; 849 850 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 851 vnc_write(vs, tight->tight.buffer, tight->tight.offset); 852 return bytes; 853 } 854 855 if (tight_init_stream(vs, tight, stream_id, level, strategy)) { 856 return -1; 857 } 858 859 /* reserve memory in output buffer */ 860 buffer_reserve(&tight->zlib, bytes + 64); 861 862 /* set pointers */ 863 zstream->next_in = tight->tight.buffer; 864 zstream->avail_in = tight->tight.offset; 865 zstream->next_out = tight->zlib.buffer + tight->zlib.offset; 866 zstream->avail_out = tight->zlib.capacity - tight->zlib.offset; 867 previous_out = zstream->avail_out; 868 zstream->data_type = Z_BINARY; 869 870 /* start encoding */ 871 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 872 fprintf(stderr, "VNC: error during tight compression\n"); 873 return -1; 874 } 875 876 tight->zlib.offset = tight->zlib.capacity - zstream->avail_out; 877 /* ...how much data has actually been produced by deflate() */ 878 bytes = previous_out - zstream->avail_out; 879 880 tight_send_compact_size(vs, bytes); 881 vnc_write(vs, tight->zlib.buffer, bytes); 882 883 buffer_reset(&tight->zlib); 884 885 return bytes; 886 } 887 888 /* 889 * Subencoding implementations. 890 */ 891 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 892 { 893 uint8_t *buf8; 894 uint32_t pix; 895 int rshift, gshift, bshift; 896 897 buf8 = buf; 898 899 if (vs->client_endian == G_BYTE_ORDER) { 900 rshift = vs->client_pf.rshift; 901 gshift = vs->client_pf.gshift; 902 bshift = vs->client_pf.bshift; 903 } else { 904 rshift = 24 - vs->client_pf.rshift; 905 gshift = 24 - vs->client_pf.gshift; 906 bshift = 24 - vs->client_pf.bshift; 907 } 908 909 if (ret) { 910 *ret = count * 3; 911 } 912 913 while (count--) { 914 pix = ldl_he_p(buf8); 915 *buf++ = (char)(pix >> rshift); 916 *buf++ = (char)(pix >> gshift); 917 *buf++ = (char)(pix >> bshift); 918 buf8 += 4; 919 } 920 } 921 922 static int send_full_color_rect(VncState *vs, VncWorker *worker, 923 int x, int y, int w, int h) 924 { 925 VncTight *tight = &worker->tight; 926 int level = tight_conf[tight->compression].raw_zlib_level; 927 int stream = 0; 928 ssize_t bytes; 929 930 #ifdef CONFIG_PNG 931 if (tight_can_send_png_rect(vs, tight, w, h)) { 932 return send_png_rect(vs, worker, x, y, w, h, NULL); 933 } 934 #endif 935 936 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 937 938 if (tight->pixel24) { 939 tight_pack24(vs, tight->tight.buffer, w * h, &tight->tight.offset); 940 bytes = 3; 941 } else { 942 bytes = vs->client_pf.bytes_per_pixel; 943 } 944 945 bytes = tight_compress_data(vs, tight, stream, w * h * bytes, level, 946 Z_DEFAULT_STRATEGY); 947 948 return (bytes >= 0); 949 } 950 951 static int send_solid_rect(VncState *vs, VncWorker *worker) 952 { 953 VncTight *tight = &worker->tight; 954 size_t bytes; 955 956 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 957 958 if (tight->pixel24) { 959 tight_pack24(vs, tight->tight.buffer, 1, &tight->tight.offset); 960 bytes = 3; 961 } else { 962 bytes = vs->client_pf.bytes_per_pixel; 963 } 964 965 vnc_write(vs, tight->tight.buffer, bytes); 966 return 1; 967 } 968 969 static int send_mono_rect(VncState *vs, VncWorker *worker, int x, int y, 970 int w, int h, uint32_t bg, uint32_t fg) 971 { 972 ssize_t bytes; 973 int stream = 1; 974 int level = tight_conf[worker->tight.compression].mono_zlib_level; 975 976 #ifdef CONFIG_PNG 977 if (tight_can_send_png_rect(vs, &worker->tight, w, h)) { 978 int ret; 979 int bpp = vs->client_pf.bytes_per_pixel * 8; 980 VncPalette *palette = palette_new(2, bpp); 981 982 palette_put(palette, bg); 983 palette_put(palette, fg); 984 ret = send_png_rect(vs, worker, x, y, w, h, palette); 985 palette_destroy(palette); 986 return ret; 987 } 988 #endif 989 990 bytes = DIV_ROUND_UP(w, 8) * h; 991 992 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 993 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 994 vnc_write_u8(vs, 1); 995 996 switch (vs->client_pf.bytes_per_pixel) { 997 case 4: 998 { 999 uint32_t buf[2] = {bg, fg}; 1000 size_t ret = sizeof (buf); 1001 1002 if (worker->tight.pixel24) { 1003 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 1004 } 1005 vnc_write(vs, buf, ret); 1006 1007 tight_encode_mono_rect32(worker->tight.tight.buffer, w, h, bg, fg); 1008 break; 1009 } 1010 case 2: 1011 { 1012 uint16_t bg16 = bg; 1013 uint16_t fg16 = fg; 1014 vnc_write(vs, &bg16, 2); 1015 vnc_write(vs, &fg16, 2); 1016 tight_encode_mono_rect16(worker->tight.tight.buffer, w, h, bg, fg); 1017 break; 1018 } 1019 default: 1020 { 1021 uint8_t bg8 = bg; 1022 uint8_t fg8 = fg; 1023 vnc_write_u8(vs, bg8); 1024 vnc_write_u8(vs, fg8); 1025 tight_encode_mono_rect8(worker->tight.tight.buffer, w, h, bg, fg); 1026 break; 1027 } 1028 } 1029 worker->tight.tight.offset = bytes; 1030 1031 bytes = tight_compress_data(vs, &worker->tight, stream, bytes, level, 1032 Z_DEFAULT_STRATEGY); 1033 return (bytes >= 0); 1034 } 1035 1036 struct palette_cb_priv { 1037 VncState *vs; 1038 VncTight *tight; 1039 uint8_t *header; 1040 #ifdef CONFIG_PNG 1041 png_colorp png_palette; 1042 #endif 1043 }; 1044 1045 static void write_palette(int idx, uint32_t color, void *opaque) 1046 { 1047 struct palette_cb_priv *priv = opaque; 1048 VncState *vs = priv->vs; 1049 uint32_t bytes = vs->client_pf.bytes_per_pixel; 1050 1051 if (bytes == 4) { 1052 ((uint32_t*)priv->header)[idx] = color; 1053 } else { 1054 ((uint16_t*)priv->header)[idx] = color; 1055 } 1056 } 1057 1058 static bool send_gradient_rect(VncState *vs, VncWorker *worker, 1059 int x, int y, int w, int h) 1060 { 1061 VncTight *tight = &worker->tight; 1062 int stream = 3; 1063 int level = tight_conf[tight->compression].gradient_zlib_level; 1064 ssize_t bytes; 1065 1066 if (vs->client_pf.bytes_per_pixel == 1) { 1067 return send_full_color_rect(vs, worker, x, y, w, h); 1068 } 1069 1070 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1071 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1072 1073 buffer_reserve(&tight->gradient, w * 3 * sizeof(int)); 1074 1075 if (tight->pixel24) { 1076 tight_filter_gradient24(vs, tight, tight->tight.buffer, w, h); 1077 bytes = 3; 1078 } else if (vs->client_pf.bytes_per_pixel == 4) { 1079 tight_filter_gradient32(vs, tight, (uint32_t *)tight->tight.buffer, 1080 w, h); 1081 bytes = 4; 1082 } else { 1083 tight_filter_gradient16(vs, tight, (uint16_t *)tight->tight.buffer, 1084 w, h); 1085 bytes = 2; 1086 } 1087 1088 buffer_reset(&tight->gradient); 1089 1090 bytes = w * h * bytes; 1091 tight->tight.offset = bytes; 1092 1093 bytes = tight_compress_data(vs, tight, stream, bytes, 1094 level, Z_FILTERED); 1095 return (bytes >= 0); 1096 } 1097 1098 static int send_palette_rect(VncState *vs, VncWorker *worker, int x, int y, 1099 int w, int h, VncPalette *palette) 1100 { 1101 VncTight *tight = &worker->tight; 1102 int stream = 2; 1103 int level = tight_conf[tight->compression].idx_zlib_level; 1104 int colors; 1105 ssize_t bytes; 1106 1107 #ifdef CONFIG_PNG 1108 if (tight_can_send_png_rect(vs, tight, w, h)) { 1109 return send_png_rect(vs, worker, x, y, w, h, palette); 1110 } 1111 #endif 1112 1113 colors = palette_size(palette); 1114 1115 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1116 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1117 vnc_write_u8(vs, colors - 1); 1118 1119 switch (vs->client_pf.bytes_per_pixel) { 1120 case 4: 1121 { 1122 size_t old_offset, offset, palette_sz = palette_size(palette); 1123 g_autofree uint32_t *header = g_new(uint32_t, palette_sz); 1124 struct palette_cb_priv priv = { vs, tight, (uint8_t *)header }; 1125 1126 old_offset = vs->output.offset; 1127 palette_iter(palette, write_palette, &priv); 1128 vnc_write(vs, header, palette_sz * sizeof(uint32_t)); 1129 1130 if (tight->pixel24) { 1131 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1132 vs->output.offset = old_offset + offset; 1133 } 1134 1135 tight_encode_indexed_rect32(tight->tight.buffer, w * h, palette); 1136 break; 1137 } 1138 case 2: 1139 { 1140 size_t palette_sz = palette_size(palette); 1141 g_autofree uint16_t *header = g_new(uint16_t, palette_sz); 1142 struct palette_cb_priv priv = { vs, tight, (uint8_t *)header }; 1143 1144 palette_iter(palette, write_palette, &priv); 1145 vnc_write(vs, header, palette_sz * sizeof(uint16_t)); 1146 tight_encode_indexed_rect16(tight->tight.buffer, w * h, palette); 1147 break; 1148 } 1149 default: 1150 return -1; /* No palette for 8bits colors */ 1151 } 1152 bytes = w * h; 1153 tight->tight.offset = bytes; 1154 1155 bytes = tight_compress_data(vs, tight, stream, bytes, 1156 level, Z_DEFAULT_STRATEGY); 1157 return (bytes >= 0); 1158 } 1159 1160 /* 1161 * JPEG compression stuff. 1162 */ 1163 #ifdef CONFIG_VNC_JPEG 1164 /* 1165 * Destination manager implementation for JPEG library. 1166 */ 1167 1168 /* This is called once per encoding */ 1169 static void jpeg_init_destination(j_compress_ptr cinfo) 1170 { 1171 VncTight *tight = cinfo->client_data; 1172 Buffer *buffer = &tight->jpeg; 1173 1174 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1175 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1176 } 1177 1178 /* This is called when we ran out of buffer (shouldn't happen!) */ 1179 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1180 { 1181 VncTight *tight = cinfo->client_data; 1182 Buffer *buffer = &tight->jpeg; 1183 1184 buffer->offset = buffer->capacity; 1185 buffer_reserve(buffer, 2048); 1186 jpeg_init_destination(cinfo); 1187 return TRUE; 1188 } 1189 1190 /* This is called when we are done processing data */ 1191 static void jpeg_term_destination(j_compress_ptr cinfo) 1192 { 1193 VncTight *tight = cinfo->client_data; 1194 Buffer *buffer = &tight->jpeg; 1195 1196 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1197 } 1198 1199 static int send_jpeg_rect(VncState *vs, VncWorker *worker, 1200 int x, int y, int w, int h, int quality) 1201 { 1202 struct jpeg_compress_struct cinfo; 1203 struct jpeg_error_mgr jerr; 1204 struct jpeg_destination_mgr manager; 1205 pixman_image_t *linebuf; 1206 JSAMPROW row[1]; 1207 uint8_t *buf; 1208 int dy; 1209 1210 if (surface_bytes_per_pixel(vs->vd->ds) == 1) { 1211 return send_full_color_rect(vs, worker, x, y, w, h); 1212 } 1213 1214 buffer_reserve(&worker->tight.jpeg, 2048); 1215 1216 cinfo.err = jpeg_std_error(&jerr); 1217 jpeg_create_compress(&cinfo); 1218 1219 cinfo.client_data = &worker->tight; 1220 cinfo.image_width = w; 1221 cinfo.image_height = h; 1222 cinfo.input_components = 3; 1223 cinfo.in_color_space = JCS_RGB; 1224 1225 jpeg_set_defaults(&cinfo); 1226 jpeg_set_quality(&cinfo, quality, true); 1227 1228 manager.init_destination = jpeg_init_destination; 1229 manager.empty_output_buffer = jpeg_empty_output_buffer; 1230 manager.term_destination = jpeg_term_destination; 1231 cinfo.dest = &manager; 1232 1233 jpeg_start_compress(&cinfo, true); 1234 1235 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1236 buf = (uint8_t *)pixman_image_get_data(linebuf); 1237 row[0] = buf; 1238 for (dy = 0; dy < h; dy++) { 1239 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1240 jpeg_write_scanlines(&cinfo, row, 1); 1241 } 1242 qemu_pixman_image_unref(linebuf); 1243 1244 jpeg_finish_compress(&cinfo); 1245 jpeg_destroy_compress(&cinfo); 1246 1247 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1248 1249 tight_send_compact_size(vs, worker->tight.jpeg.offset); 1250 vnc_write(vs, worker->tight.jpeg.buffer, worker->tight.jpeg.offset); 1251 buffer_reset(&worker->tight.jpeg); 1252 1253 return 1; 1254 } 1255 #endif /* CONFIG_VNC_JPEG */ 1256 1257 /* 1258 * PNG compression stuff. 1259 */ 1260 #ifdef CONFIG_PNG 1261 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1262 { 1263 struct palette_cb_priv *priv = opaque; 1264 VncState *vs = priv->vs; 1265 png_colorp color = &priv->png_palette[idx]; 1266 1267 if (priv->tight->pixel24) 1268 { 1269 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1270 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1271 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1272 } 1273 else 1274 { 1275 int red, green, blue; 1276 1277 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1278 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1279 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1280 color->red = ((red * 255 + vs->client_pf.rmax / 2) / 1281 vs->client_pf.rmax); 1282 color->green = ((green * 255 + vs->client_pf.gmax / 2) / 1283 vs->client_pf.gmax); 1284 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) / 1285 vs->client_pf.bmax); 1286 } 1287 } 1288 1289 static void png_write_data(png_structp png_ptr, png_bytep data, 1290 png_size_t length) 1291 { 1292 VncWorker *worker = png_get_io_ptr(png_ptr); 1293 1294 buffer_reserve(&worker->tight.png, worker->tight.png.offset + length); 1295 memcpy(worker->tight.png.buffer + worker->tight.png.offset, data, length); 1296 1297 worker->tight.png.offset += length; 1298 } 1299 1300 static void png_flush_data(png_structp png_ptr) 1301 { 1302 } 1303 1304 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1305 { 1306 return g_malloc(size); 1307 } 1308 1309 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1310 { 1311 g_free(ptr); 1312 } 1313 1314 static int send_png_rect(VncState *vs, VncWorker *worker, 1315 int x, int y, int w, int h, VncPalette *palette) 1316 { 1317 png_byte color_type; 1318 png_structp png_ptr; 1319 png_infop info_ptr; 1320 png_colorp png_palette = NULL; 1321 pixman_image_t *linebuf; 1322 int level = tight_png_conf[worker->tight.compression].png_zlib_level; 1323 int filters = tight_png_conf[worker->tight.compression].png_filters; 1324 uint8_t *buf; 1325 int dy; 1326 1327 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1328 NULL, vnc_png_malloc, vnc_png_free); 1329 1330 if (png_ptr == NULL) 1331 return -1; 1332 1333 info_ptr = png_create_info_struct(png_ptr); 1334 1335 if (info_ptr == NULL) { 1336 png_destroy_write_struct(&png_ptr, NULL); 1337 return -1; 1338 } 1339 1340 png_set_write_fn(png_ptr, worker, png_write_data, png_flush_data); 1341 png_set_compression_level(png_ptr, level); 1342 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1343 1344 if (palette) { 1345 color_type = PNG_COLOR_TYPE_PALETTE; 1346 } else { 1347 color_type = PNG_COLOR_TYPE_RGB; 1348 } 1349 1350 png_set_IHDR(png_ptr, info_ptr, w, h, 1351 8, color_type, PNG_INTERLACE_NONE, 1352 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1353 1354 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1355 struct palette_cb_priv priv; 1356 1357 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1358 palette_size(palette)); 1359 1360 priv.vs = vs; 1361 priv.tight = &worker->tight; 1362 priv.png_palette = png_palette; 1363 palette_iter(palette, write_png_palette, &priv); 1364 1365 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1366 1367 if (vs->client_pf.bytes_per_pixel == 4) { 1368 tight_encode_indexed_rect32(worker->tight.tight.buffer, w * h, 1369 palette); 1370 } else { 1371 tight_encode_indexed_rect16(worker->tight.tight.buffer, w * h, 1372 palette); 1373 } 1374 } 1375 1376 png_write_info(png_ptr, info_ptr); 1377 1378 buffer_reserve(&worker->tight.png, 2048); 1379 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1380 buf = (uint8_t *)pixman_image_get_data(linebuf); 1381 for (dy = 0; dy < h; dy++) 1382 { 1383 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1384 memcpy(buf, worker->tight.tight.buffer + (dy * w), w); 1385 } else { 1386 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1387 } 1388 png_write_row(png_ptr, buf); 1389 } 1390 qemu_pixman_image_unref(linebuf); 1391 1392 png_write_end(png_ptr, NULL); 1393 1394 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1395 png_free(png_ptr, png_palette); 1396 } 1397 1398 png_destroy_write_struct(&png_ptr, &info_ptr); 1399 1400 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1401 1402 tight_send_compact_size(vs, worker->tight.png.offset); 1403 vnc_write(vs, worker->tight.png.buffer, worker->tight.png.offset); 1404 buffer_reset(&worker->tight.png); 1405 return 1; 1406 } 1407 #endif /* CONFIG_PNG */ 1408 1409 static void vnc_tight_start(VncState *vs, VncTight *tight) 1410 { 1411 buffer_reset(&tight->tight); 1412 1413 // make the output buffer be the zlib buffer, so we can compress it later 1414 tight->tmp = vs->output; 1415 vs->output = tight->tight; 1416 } 1417 1418 static void vnc_tight_stop(VncState *vs, VncTight *tight) 1419 { 1420 // switch back to normal output/zlib buffers 1421 tight->tight = vs->output; 1422 vs->output = tight->tmp; 1423 } 1424 1425 static int send_sub_rect_nojpeg(VncState *vs, VncWorker *worker, 1426 int x, int y, int w, int h, 1427 int bg, int fg, int colors, VncPalette *palette) 1428 { 1429 int ret; 1430 1431 if (colors == 0) { 1432 if (tight_detect_smooth_image(vs, &worker->tight, w, h)) { 1433 ret = send_gradient_rect(vs, worker, x, y, w, h); 1434 } else { 1435 ret = send_full_color_rect(vs, worker, x, y, w, h); 1436 } 1437 } else if (colors == 1) { 1438 ret = send_solid_rect(vs, worker); 1439 } else if (colors == 2) { 1440 ret = send_mono_rect(vs, worker, x, y, w, h, bg, fg); 1441 } else if (colors <= 256) { 1442 ret = send_palette_rect(vs, worker, x, y, w, h, palette); 1443 } else { 1444 ret = 0; 1445 } 1446 return ret; 1447 } 1448 1449 #ifdef CONFIG_VNC_JPEG 1450 static int send_sub_rect_jpeg(VncState *vs, VncWorker *worker, 1451 int x, int y, int w, int h, 1452 int bg, int fg, int colors, 1453 VncPalette *palette, bool force) 1454 { 1455 int ret; 1456 1457 if (colors == 0) { 1458 if (force || (tight_jpeg_conf[worker->tight.quality].jpeg_full && 1459 tight_detect_smooth_image(vs, &worker->tight, w, h))) { 1460 int quality = tight_conf[worker->tight.quality].jpeg_quality; 1461 1462 ret = send_jpeg_rect(vs, worker, x, y, w, h, quality); 1463 } else { 1464 ret = send_full_color_rect(vs, worker, x, y, w, h); 1465 } 1466 } else if (colors == 1) { 1467 ret = send_solid_rect(vs, worker); 1468 } else if (colors == 2) { 1469 ret = send_mono_rect(vs, worker, x, y, w, h, bg, fg); 1470 } else if (colors <= 256) { 1471 if (force || (colors > 96 && 1472 tight_jpeg_conf[worker->tight.quality].jpeg_idx && 1473 tight_detect_smooth_image(vs, &worker->tight, w, h))) { 1474 int quality = tight_conf[worker->tight.quality].jpeg_quality; 1475 1476 ret = send_jpeg_rect(vs, worker, x, y, w, h, quality); 1477 } else { 1478 ret = send_palette_rect(vs, worker, x, y, w, h, palette); 1479 } 1480 } else { 1481 ret = 0; 1482 } 1483 return ret; 1484 } 1485 #endif 1486 1487 static __thread VncPalette *color_count_palette; 1488 static __thread Notifier vnc_tight_cleanup_notifier; 1489 1490 static void vnc_tight_cleanup(Notifier *n, void *value) 1491 { 1492 g_free(color_count_palette); 1493 color_count_palette = NULL; 1494 } 1495 1496 static int send_sub_rect(VncState *vs, VncWorker *worker, 1497 int x, int y, int w, int h) 1498 { 1499 VncTight *tight = &worker->tight; 1500 uint32_t bg = 0, fg = 0; 1501 int colors; 1502 int ret = 0; 1503 #ifdef CONFIG_VNC_JPEG 1504 bool force_jpeg = false; 1505 bool allow_jpeg = true; 1506 #endif 1507 1508 if (!color_count_palette) { 1509 color_count_palette = g_new(VncPalette, 1); 1510 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup; 1511 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier); 1512 } 1513 1514 vnc_framebuffer_update(vs, x, y, w, h, tight->type); 1515 1516 vnc_tight_start(vs, tight); 1517 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1518 vnc_tight_stop(vs, tight); 1519 1520 #ifdef CONFIG_VNC_JPEG 1521 if (!vs->vd->non_adaptive && tight->quality != (uint8_t)-1) { 1522 double freq = vnc_update_freq(vs, x, y, w, h); 1523 1524 if (freq < tight_jpeg_conf[tight->quality].jpeg_freq_min) { 1525 allow_jpeg = false; 1526 } 1527 if (freq >= tight_jpeg_conf[tight->quality].jpeg_freq_threshold) { 1528 force_jpeg = true; 1529 vnc_sent_lossy_rect(worker, x, y, w, h); 1530 } 1531 } 1532 #endif 1533 1534 colors = tight_fill_palette(vs, tight, x, y, w * h, &bg, &fg, 1535 color_count_palette); 1536 1537 #ifdef CONFIG_VNC_JPEG 1538 if (allow_jpeg && tight->quality != (uint8_t)-1) { 1539 ret = send_sub_rect_jpeg(vs, worker, x, y, w, h, bg, fg, colors, 1540 color_count_palette, force_jpeg); 1541 } else { 1542 ret = send_sub_rect_nojpeg(vs, worker, x, y, w, h, bg, fg, 1543 colors, color_count_palette); 1544 } 1545 #else 1546 ret = send_sub_rect_nojpeg(vs, worker, x, y, w, h, bg, fg, colors, 1547 color_count_palette); 1548 #endif 1549 1550 return ret; 1551 } 1552 1553 static int send_sub_rect_solid(VncState *vs, VncWorker *worker, 1554 int x, int y, int w, int h) 1555 { 1556 vnc_framebuffer_update(vs, x, y, w, h, worker->tight.type); 1557 1558 vnc_tight_start(vs, &worker->tight); 1559 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1560 vnc_tight_stop(vs, &worker->tight); 1561 1562 return send_solid_rect(vs, worker); 1563 } 1564 1565 static int send_rect_simple(VncState *vs, VncWorker *worker, 1566 int x, int y, int w, int h, bool split) 1567 { 1568 int max_size, max_width; 1569 int max_sub_width, max_sub_height; 1570 int dx, dy; 1571 int rw, rh; 1572 int n = 0; 1573 1574 max_size = tight_conf[worker->tight.compression].max_rect_size; 1575 max_width = tight_conf[worker->tight.compression].max_rect_width; 1576 1577 if (split && (w > max_width || w * h > max_size)) { 1578 max_sub_width = (w > max_width) ? max_width : w; 1579 max_sub_height = max_size / max_sub_width; 1580 1581 for (dy = 0; dy < h; dy += max_sub_height) { 1582 for (dx = 0; dx < w; dx += max_width) { 1583 rw = MIN(max_sub_width, w - dx); 1584 rh = MIN(max_sub_height, h - dy); 1585 n += send_sub_rect(vs, worker, x + dx, y + dy, rw, rh); 1586 } 1587 } 1588 } else { 1589 n += send_sub_rect(vs, worker, x, y, w, h); 1590 } 1591 1592 return n; 1593 } 1594 1595 static int find_large_solid_color_rect(VncState *vs, VncWorker *worker, 1596 int x, int y, int w, int h, int max_rows) 1597 { 1598 int dx, dy, dw, dh; 1599 int n = 0; 1600 1601 /* Try to find large solid-color areas and send them separately. */ 1602 1603 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1604 1605 /* If a rectangle becomes too large, send its upper part now. */ 1606 1607 if (dy - y >= max_rows) { 1608 n += send_rect_simple(vs, worker, x, y, w, max_rows, true); 1609 y += max_rows; 1610 h -= max_rows; 1611 } 1612 1613 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1614 1615 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1616 uint32_t color_value; 1617 int x_best, y_best, w_best, h_best; 1618 1619 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1620 1621 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1622 continue ; 1623 } 1624 1625 /* Get dimensions of solid-color area. */ 1626 1627 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1628 color_value, &w_best, &h_best); 1629 1630 /* Make sure a solid rectangle is large enough 1631 (or the whole rectangle is of the same color). */ 1632 1633 if (w_best * h_best != w * h && 1634 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1635 continue; 1636 } 1637 1638 /* Try to extend solid rectangle to maximum size. */ 1639 1640 x_best = dx; y_best = dy; 1641 extend_solid_area(vs, x, y, w, h, color_value, 1642 &x_best, &y_best, &w_best, &h_best); 1643 1644 /* Send rectangles at top and left to solid-color area. */ 1645 1646 if (y_best != y) { 1647 n += send_rect_simple(vs, worker, x, y, w, y_best - y, true); 1648 } 1649 if (x_best != x) { 1650 n += tight_send_framebuffer_update(vs, worker, x, y_best, 1651 x_best-x, h_best); 1652 } 1653 1654 /* Send solid-color rectangle. */ 1655 n += send_sub_rect_solid(vs, worker, 1656 x_best, y_best, w_best, h_best); 1657 1658 /* Send remaining rectangles (at right and bottom). */ 1659 1660 if (x_best + w_best != x + w) { 1661 n += tight_send_framebuffer_update(vs, worker, x_best + w_best, 1662 y_best, 1663 w-(x_best-x)-w_best, 1664 h_best); 1665 } 1666 if (y_best + h_best != y + h) { 1667 n += tight_send_framebuffer_update(vs, worker, 1668 x, y_best + h_best, 1669 w, h-(y_best-y)-h_best); 1670 } 1671 1672 /* Return after all recursive calls are done. */ 1673 return n; 1674 } 1675 } 1676 return n + send_rect_simple(vs, worker, x, y, w, h, true); 1677 } 1678 1679 static int tight_send_framebuffer_update(VncState *vs, VncWorker *worker, 1680 int x, int y, int w, int h) 1681 { 1682 int max_rows; 1683 1684 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF && 1685 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) { 1686 worker->tight.pixel24 = true; 1687 } else { 1688 worker->tight.pixel24 = false; 1689 } 1690 1691 #ifdef CONFIG_VNC_JPEG 1692 if (worker->tight.quality != (uint8_t)-1) { 1693 double freq = vnc_update_freq(vs, x, y, w, h); 1694 1695 if (freq > tight_jpeg_conf[worker->tight.quality].jpeg_freq_threshold) { 1696 return send_rect_simple(vs, worker, x, y, w, h, false); 1697 } 1698 } 1699 #endif 1700 1701 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1702 return send_rect_simple(vs, worker, x, y, w, h, true); 1703 } 1704 1705 /* Calculate maximum number of rows in one non-solid rectangle. */ 1706 1707 max_rows = tight_conf[worker->tight.compression].max_rect_size; 1708 max_rows /= MIN(tight_conf[worker->tight.compression].max_rect_width, w); 1709 1710 return find_large_solid_color_rect(vs, worker, x, y, w, h, max_rows); 1711 } 1712 1713 int vnc_tight_send_framebuffer_update(VncState *vs, VncWorker *worker, 1714 int x, int y, int w, int h) 1715 { 1716 worker->tight.type = VNC_ENCODING_TIGHT; 1717 return tight_send_framebuffer_update(vs, worker, x, y, w, h); 1718 } 1719 1720 int vnc_tight_png_send_framebuffer_update(VncState *vs, VncWorker *worker, 1721 int x, int y, int w, int h) 1722 { 1723 worker->tight.type = VNC_ENCODING_TIGHT_PNG; 1724 return tight_send_framebuffer_update(vs, worker, x, y, w, h); 1725 } 1726 1727 void vnc_tight_clear(VncWorker *worker) 1728 { 1729 int i; 1730 for (i = 0; i < ARRAY_SIZE(worker->tight.stream); i++) { 1731 if (worker->tight.stream[i].opaque) { 1732 deflateEnd(&worker->tight.stream[i]); 1733 } 1734 } 1735 1736 buffer_free(&worker->tight.tight); 1737 buffer_free(&worker->tight.zlib); 1738 buffer_free(&worker->tight.gradient); 1739 #ifdef CONFIG_VNC_JPEG 1740 buffer_free(&worker->tight.jpeg); 1741 #endif 1742 #ifdef CONFIG_PNG 1743 buffer_free(&worker->tight.png); 1744 #endif 1745 } 1746