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