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 "bswap.h" 48 #include "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 (ds_get_bytes_per_pixel(vs->ds) == 1 || 127 vs->clientds.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->clientds.flags & QEMU_BIG_ENDIAN_FLAG); 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 /* 95% smooth or more ... */ 185 if (stats[0] * 33 / pixels >= 95) { 186 return 0; 187 } 188 189 errors = 0; 190 for (c = 1; c < 8; c++) { 191 errors += stats[c] * (c * c); 192 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 193 return 0; 194 } 195 } 196 for (; c < 256; c++) { 197 errors += stats[c] * (c * c); 198 } 199 errors /= (pixels * 3 - stats[0]); 200 201 return errors; 202 } 203 204 #define DEFINE_DETECT_FUNCTION(bpp) \ 205 \ 206 static unsigned int \ 207 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 208 bool endian; \ 209 uint##bpp##_t pix; \ 210 int max[3], shift[3]; \ 211 int x, y, d, dx; \ 212 unsigned int c; \ 213 unsigned int stats[256]; \ 214 int pixels = 0; \ 215 int sample, sum, left[3]; \ 216 unsigned int errors; \ 217 unsigned char *buf = vs->tight.tight.buffer; \ 218 \ 219 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 220 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ 221 \ 222 \ 223 max[0] = vs->clientds.pf.rmax; \ 224 max[1] = vs->clientds.pf.gmax; \ 225 max[2] = vs->clientds.pf.bmax; \ 226 shift[0] = vs->clientds.pf.rshift; \ 227 shift[1] = vs->clientds.pf.gshift; \ 228 shift[2] = vs->clientds.pf.bshift; \ 229 \ 230 memset(stats, 0, sizeof(stats)); \ 231 \ 232 y = 0, x = 0; \ 233 while (y < h && x < w) { \ 234 for (d = 0; d < h - y && \ 235 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 236 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 237 if (endian) { \ 238 pix = bswap##bpp(pix); \ 239 } \ 240 for (c = 0; c < 3; c++) { \ 241 left[c] = (int)(pix >> shift[c] & max[c]); \ 242 } \ 243 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 244 dx++) { \ 245 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 246 if (endian) { \ 247 pix = bswap##bpp(pix); \ 248 } \ 249 sum = 0; \ 250 for (c = 0; c < 3; c++) { \ 251 sample = (int)(pix >> shift[c] & max[c]); \ 252 sum += abs(sample - left[c]); \ 253 left[c] = sample; \ 254 } \ 255 if (sum > 255) { \ 256 sum = 255; \ 257 } \ 258 stats[sum]++; \ 259 pixels++; \ 260 } \ 261 } \ 262 if (w > h) { \ 263 x += h; \ 264 y = 0; \ 265 } else { \ 266 x = 0; \ 267 y += w; \ 268 } \ 269 } \ 270 \ 271 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 272 return 0; \ 273 } \ 274 \ 275 errors = 0; \ 276 for (c = 1; c < 8; c++) { \ 277 errors += stats[c] * (c * c); \ 278 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 279 return 0; \ 280 } \ 281 } \ 282 for (; c < 256; c++) { \ 283 errors += stats[c] * (c * c); \ 284 } \ 285 errors /= (pixels - stats[0]); \ 286 \ 287 return errors; \ 288 } 289 290 DEFINE_DETECT_FUNCTION(16) 291 DEFINE_DETECT_FUNCTION(32) 292 293 static int 294 tight_detect_smooth_image(VncState *vs, int w, int h) 295 { 296 unsigned int errors; 297 int compression = vs->tight.compression; 298 int quality = vs->tight.quality; 299 300 if (!vs->vd->lossy) { 301 return 0; 302 } 303 304 if (ds_get_bytes_per_pixel(vs->ds) == 1 || 305 vs->clientds.pf.bytes_per_pixel == 1 || 306 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 307 return 0; 308 } 309 310 if (vs->tight.quality != (uint8_t)-1) { 311 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 312 return 0; 313 } 314 } else { 315 if (w * h < tight_conf[compression].gradient_min_rect_size) { 316 return 0; 317 } 318 } 319 320 if (vs->clientds.pf.bytes_per_pixel == 4) { 321 if (vs->tight.pixel24) { 322 errors = tight_detect_smooth_image24(vs, w, h); 323 if (vs->tight.quality != (uint8_t)-1) { 324 return (errors < tight_conf[quality].jpeg_threshold24); 325 } 326 return (errors < tight_conf[compression].gradient_threshold24); 327 } else { 328 errors = tight_detect_smooth_image32(vs, w, h); 329 } 330 } else { 331 errors = tight_detect_smooth_image16(vs, w, h); 332 } 333 if (quality != -1) { 334 return (errors < tight_conf[quality].jpeg_threshold); 335 } 336 return (errors < tight_conf[compression].gradient_threshold); 337 } 338 339 /* 340 * Code to determine how many different colors used in rectangle. 341 */ 342 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 343 \ 344 static int \ 345 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 346 int max, size_t count, \ 347 uint32_t *bg, uint32_t *fg, \ 348 VncPalette **palette) { \ 349 uint##bpp##_t *data; \ 350 uint##bpp##_t c0, c1, ci; \ 351 int i, n0, n1; \ 352 \ 353 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 354 \ 355 c0 = data[0]; \ 356 i = 1; \ 357 while (i < count && data[i] == c0) \ 358 i++; \ 359 if (i >= count) { \ 360 *bg = *fg = c0; \ 361 return 1; \ 362 } \ 363 \ 364 if (max < 2) { \ 365 return 0; \ 366 } \ 367 \ 368 n0 = i; \ 369 c1 = data[i]; \ 370 n1 = 0; \ 371 for (i++; i < count; i++) { \ 372 ci = data[i]; \ 373 if (ci == c0) { \ 374 n0++; \ 375 } else if (ci == c1) { \ 376 n1++; \ 377 } else \ 378 break; \ 379 } \ 380 if (i >= count) { \ 381 if (n0 > n1) { \ 382 *bg = (uint32_t)c0; \ 383 *fg = (uint32_t)c1; \ 384 } else { \ 385 *bg = (uint32_t)c1; \ 386 *fg = (uint32_t)c0; \ 387 } \ 388 return 2; \ 389 } \ 390 \ 391 if (max == 2) { \ 392 return 0; \ 393 } \ 394 \ 395 *palette = palette_new(max, bpp); \ 396 palette_put(*palette, c0); \ 397 palette_put(*palette, c1); \ 398 palette_put(*palette, ci); \ 399 \ 400 for (i++; i < count; i++) { \ 401 if (data[i] == ci) { \ 402 continue; \ 403 } else { \ 404 ci = data[i]; \ 405 if (!palette_put(*palette, (uint32_t)ci)) { \ 406 return 0; \ 407 } \ 408 } \ 409 } \ 410 \ 411 return palette_size(*palette); \ 412 } 413 414 DEFINE_FILL_PALETTE_FUNCTION(8) 415 DEFINE_FILL_PALETTE_FUNCTION(16) 416 DEFINE_FILL_PALETTE_FUNCTION(32) 417 418 static int tight_fill_palette(VncState *vs, int x, int y, 419 size_t count, uint32_t *bg, uint32_t *fg, 420 VncPalette **palette) 421 { 422 int max; 423 424 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 425 if (max < 2 && 426 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 427 max = 2; 428 } 429 if (max >= 256) { 430 max = 256; 431 } 432 433 switch(vs->clientds.pf.bytes_per_pixel) { 434 case 4: 435 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 436 case 2: 437 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 438 default: 439 max = 2; 440 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 441 } 442 return 0; 443 } 444 445 /* 446 * Converting truecolor samples into palette indices. 447 */ 448 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 449 \ 450 static void \ 451 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 452 VncPalette *palette) { \ 453 uint##bpp##_t *src; \ 454 uint##bpp##_t rgb; \ 455 int i, rep; \ 456 uint8_t idx; \ 457 \ 458 src = (uint##bpp##_t *) buf; \ 459 \ 460 for (i = 0; i < count; i++) { \ 461 \ 462 rgb = *src++; \ 463 rep = 0; \ 464 while (i < count && *src == rgb) { \ 465 rep++, src++, i++; \ 466 } \ 467 idx = palette_idx(palette, rgb); \ 468 /* \ 469 * Should never happen, but don't break everything \ 470 * if it does, use the first color instead \ 471 */ \ 472 if (idx == (uint8_t)-1) { \ 473 idx = 0; \ 474 } \ 475 while (rep >= 0) { \ 476 *buf++ = idx; \ 477 rep--; \ 478 } \ 479 } \ 480 } 481 482 DEFINE_IDX_ENCODE_FUNCTION(16) 483 DEFINE_IDX_ENCODE_FUNCTION(32) 484 485 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 486 \ 487 static void \ 488 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 489 uint##bpp##_t bg, uint##bpp##_t fg) { \ 490 uint##bpp##_t *ptr; \ 491 unsigned int value, mask; \ 492 int aligned_width; \ 493 int x, y, bg_bits; \ 494 \ 495 ptr = (uint##bpp##_t *) buf; \ 496 aligned_width = w - w % 8; \ 497 \ 498 for (y = 0; y < h; y++) { \ 499 for (x = 0; x < aligned_width; x += 8) { \ 500 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 501 if (*ptr++ != bg) { \ 502 break; \ 503 } \ 504 } \ 505 if (bg_bits == 8) { \ 506 *buf++ = 0; \ 507 continue; \ 508 } \ 509 mask = 0x80 >> bg_bits; \ 510 value = mask; \ 511 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 512 mask >>= 1; \ 513 if (*ptr++ != bg) { \ 514 value |= mask; \ 515 } \ 516 } \ 517 *buf++ = (uint8_t)value; \ 518 } \ 519 \ 520 mask = 0x80; \ 521 value = 0; \ 522 if (x >= w) { \ 523 continue; \ 524 } \ 525 \ 526 for (; x < w; x++) { \ 527 if (*ptr++ != bg) { \ 528 value |= mask; \ 529 } \ 530 mask >>= 1; \ 531 } \ 532 *buf++ = (uint8_t)value; \ 533 } \ 534 } 535 536 DEFINE_MONO_ENCODE_FUNCTION(8) 537 DEFINE_MONO_ENCODE_FUNCTION(16) 538 DEFINE_MONO_ENCODE_FUNCTION(32) 539 540 /* 541 * ``Gradient'' filter for 24-bit color samples. 542 * Should be called only when redMax, greenMax and blueMax are 255. 543 * Color components assumed to be byte-aligned. 544 */ 545 546 static void 547 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 548 { 549 uint32_t *buf32; 550 uint32_t pix32; 551 int shift[3]; 552 int *prev; 553 int here[3], upper[3], left[3], upperleft[3]; 554 int prediction; 555 int x, y, c; 556 557 buf32 = (uint32_t *)buf; 558 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 559 560 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 561 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { 562 shift[0] = vs->clientds.pf.rshift; 563 shift[1] = vs->clientds.pf.gshift; 564 shift[2] = vs->clientds.pf.bshift; 565 } else { 566 shift[0] = 24 - vs->clientds.pf.rshift; 567 shift[1] = 24 - vs->clientds.pf.gshift; 568 shift[2] = 24 - vs->clientds.pf.bshift; 569 } 570 571 for (y = 0; y < h; y++) { 572 for (c = 0; c < 3; c++) { 573 upper[c] = 0; 574 here[c] = 0; 575 } 576 prev = (int *)vs->tight.gradient.buffer; 577 for (x = 0; x < w; x++) { 578 pix32 = *buf32++; 579 for (c = 0; c < 3; c++) { 580 upperleft[c] = upper[c]; 581 left[c] = here[c]; 582 upper[c] = *prev; 583 here[c] = (int)(pix32 >> shift[c] & 0xFF); 584 *prev++ = here[c]; 585 586 prediction = left[c] + upper[c] - upperleft[c]; 587 if (prediction < 0) { 588 prediction = 0; 589 } else if (prediction > 0xFF) { 590 prediction = 0xFF; 591 } 592 *buf++ = (char)(here[c] - prediction); 593 } 594 } 595 } 596 } 597 598 599 /* 600 * ``Gradient'' filter for other color depths. 601 */ 602 603 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 604 \ 605 static void \ 606 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 607 int w, int h) { \ 608 uint##bpp##_t pix, diff; \ 609 bool endian; \ 610 int *prev; \ 611 int max[3], shift[3]; \ 612 int here[3], upper[3], left[3], upperleft[3]; \ 613 int prediction; \ 614 int x, y, c; \ 615 \ 616 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 617 \ 618 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 619 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ 620 \ 621 max[0] = vs->clientds.pf.rmax; \ 622 max[1] = vs->clientds.pf.gmax; \ 623 max[2] = vs->clientds.pf.bmax; \ 624 shift[0] = vs->clientds.pf.rshift; \ 625 shift[1] = vs->clientds.pf.gshift; \ 626 shift[2] = vs->clientds.pf.bshift; \ 627 \ 628 for (y = 0; y < h; y++) { \ 629 for (c = 0; c < 3; c++) { \ 630 upper[c] = 0; \ 631 here[c] = 0; \ 632 } \ 633 prev = (int *)vs->tight.gradient.buffer; \ 634 for (x = 0; x < w; x++) { \ 635 pix = *buf; \ 636 if (endian) { \ 637 pix = bswap##bpp(pix); \ 638 } \ 639 diff = 0; \ 640 for (c = 0; c < 3; c++) { \ 641 upperleft[c] = upper[c]; \ 642 left[c] = here[c]; \ 643 upper[c] = *prev; \ 644 here[c] = (int)(pix >> shift[c] & max[c]); \ 645 *prev++ = here[c]; \ 646 \ 647 prediction = left[c] + upper[c] - upperleft[c]; \ 648 if (prediction < 0) { \ 649 prediction = 0; \ 650 } else if (prediction > max[c]) { \ 651 prediction = max[c]; \ 652 } \ 653 diff |= ((here[c] - prediction) & max[c]) \ 654 << shift[c]; \ 655 } \ 656 if (endian) { \ 657 diff = bswap##bpp(diff); \ 658 } \ 659 *buf++ = diff; \ 660 } \ 661 } \ 662 } 663 664 DEFINE_GRADIENT_FILTER_FUNCTION(16) 665 DEFINE_GRADIENT_FILTER_FUNCTION(32) 666 667 /* 668 * Check if a rectangle is all of the same color. If needSameColor is 669 * set to non-zero, then also check that its color equals to the 670 * *colorPtr value. The result is 1 if the test is successful, and in 671 * that case new color will be stored in *colorPtr. 672 */ 673 674 #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \ 675 \ 676 static bool \ 677 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \ 678 uint32_t* color, bool samecolor) \ 679 { \ 680 VncDisplay *vd = vs->vd; \ 681 uint##bpp##_t *fbptr; \ 682 uint##bpp##_t c; \ 683 int dx, dy; \ 684 \ 685 fbptr = (uint##bpp##_t *) \ 686 (vd->server->data + y * ds_get_linesize(vs->ds) + \ 687 x * ds_get_bytes_per_pixel(vs->ds)); \ 688 \ 689 c = *fbptr; \ 690 if (samecolor && (uint32_t)c != *color) { \ 691 return false; \ 692 } \ 693 \ 694 for (dy = 0; dy < h; dy++) { \ 695 for (dx = 0; dx < w; dx++) { \ 696 if (c != fbptr[dx]) { \ 697 return false; \ 698 } \ 699 } \ 700 fbptr = (uint##bpp##_t *) \ 701 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \ 702 } \ 703 \ 704 *color = (uint32_t)c; \ 705 return true; \ 706 } 707 708 DEFINE_CHECK_SOLID_FUNCTION(32) 709 DEFINE_CHECK_SOLID_FUNCTION(16) 710 DEFINE_CHECK_SOLID_FUNCTION(8) 711 712 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 713 uint32_t* color, bool samecolor) 714 { 715 VncDisplay *vd = vs->vd; 716 717 switch(vd->server->pf.bytes_per_pixel) { 718 case 4: 719 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 720 case 2: 721 return check_solid_tile16(vs, x, y, w, h, color, samecolor); 722 default: 723 return check_solid_tile8(vs, x, y, w, h, color, samecolor); 724 } 725 } 726 727 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 728 uint32_t color, int *w_ptr, int *h_ptr) 729 { 730 int dx, dy, dw, dh; 731 int w_prev; 732 int w_best = 0, h_best = 0; 733 734 w_prev = w; 735 736 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 737 738 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 739 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 740 741 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 742 break; 743 } 744 745 for (dx = x + dw; dx < x + w_prev;) { 746 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 747 748 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 749 break; 750 } 751 dx += dw; 752 } 753 754 w_prev = dx - x; 755 if (w_prev * (dy + dh - y) > w_best * h_best) { 756 w_best = w_prev; 757 h_best = dy + dh - y; 758 } 759 } 760 761 *w_ptr = w_best; 762 *h_ptr = h_best; 763 } 764 765 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 766 uint32_t color, int *x_ptr, int *y_ptr, 767 int *w_ptr, int *h_ptr) 768 { 769 int cx, cy; 770 771 /* Try to extend the area upwards. */ 772 for ( cy = *y_ptr - 1; 773 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 774 cy-- ); 775 *h_ptr += *y_ptr - (cy + 1); 776 *y_ptr = cy + 1; 777 778 /* ... downwards. */ 779 for ( cy = *y_ptr + *h_ptr; 780 cy < y + h && 781 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 782 cy++ ); 783 *h_ptr += cy - (*y_ptr + *h_ptr); 784 785 /* ... to the left. */ 786 for ( cx = *x_ptr - 1; 787 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 788 cx-- ); 789 *w_ptr += *x_ptr - (cx + 1); 790 *x_ptr = cx + 1; 791 792 /* ... to the right. */ 793 for ( cx = *x_ptr + *w_ptr; 794 cx < x + w && 795 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 796 cx++ ); 797 *w_ptr += cx - (*x_ptr + *w_ptr); 798 } 799 800 static int tight_init_stream(VncState *vs, int stream_id, 801 int level, int strategy) 802 { 803 z_streamp zstream = &vs->tight.stream[stream_id]; 804 805 if (zstream->opaque == NULL) { 806 int err; 807 808 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 809 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 810 zstream->zalloc = vnc_zlib_zalloc; 811 zstream->zfree = vnc_zlib_zfree; 812 813 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 814 MAX_MEM_LEVEL, strategy); 815 816 if (err != Z_OK) { 817 fprintf(stderr, "VNC: error initializing zlib\n"); 818 return -1; 819 } 820 821 vs->tight.levels[stream_id] = level; 822 zstream->opaque = vs; 823 } 824 825 if (vs->tight.levels[stream_id] != level) { 826 if (deflateParams(zstream, level, strategy) != Z_OK) { 827 return -1; 828 } 829 vs->tight.levels[stream_id] = level; 830 } 831 return 0; 832 } 833 834 static void tight_send_compact_size(VncState *vs, size_t len) 835 { 836 int lpc = 0; 837 int bytes = 0; 838 char buf[3] = {0, 0, 0}; 839 840 buf[bytes++] = len & 0x7F; 841 if (len > 0x7F) { 842 buf[bytes-1] |= 0x80; 843 buf[bytes++] = (len >> 7) & 0x7F; 844 if (len > 0x3FFF) { 845 buf[bytes-1] |= 0x80; 846 buf[bytes++] = (len >> 14) & 0xFF; 847 } 848 } 849 for (lpc = 0; lpc < bytes; lpc++) { 850 vnc_write_u8(vs, buf[lpc]); 851 } 852 } 853 854 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 855 int level, int strategy) 856 { 857 z_streamp zstream = &vs->tight.stream[stream_id]; 858 int previous_out; 859 860 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 861 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 862 return bytes; 863 } 864 865 if (tight_init_stream(vs, stream_id, level, strategy)) { 866 return -1; 867 } 868 869 /* reserve memory in output buffer */ 870 buffer_reserve(&vs->tight.zlib, bytes + 64); 871 872 /* set pointers */ 873 zstream->next_in = vs->tight.tight.buffer; 874 zstream->avail_in = vs->tight.tight.offset; 875 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 876 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 877 previous_out = zstream->avail_out; 878 zstream->data_type = Z_BINARY; 879 880 /* start encoding */ 881 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 882 fprintf(stderr, "VNC: error during tight compression\n"); 883 return -1; 884 } 885 886 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 887 /* ...how much data has actually been produced by deflate() */ 888 bytes = previous_out - zstream->avail_out; 889 890 tight_send_compact_size(vs, bytes); 891 vnc_write(vs, vs->tight.zlib.buffer, bytes); 892 893 buffer_reset(&vs->tight.zlib); 894 895 return bytes; 896 } 897 898 /* 899 * Subencoding implementations. 900 */ 901 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 902 { 903 uint32_t *buf32; 904 uint32_t pix; 905 int rshift, gshift, bshift; 906 907 buf32 = (uint32_t *)buf; 908 909 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 910 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { 911 rshift = vs->clientds.pf.rshift; 912 gshift = vs->clientds.pf.gshift; 913 bshift = vs->clientds.pf.bshift; 914 } else { 915 rshift = 24 - vs->clientds.pf.rshift; 916 gshift = 24 - vs->clientds.pf.gshift; 917 bshift = 24 - vs->clientds.pf.bshift; 918 } 919 920 if (ret) { 921 *ret = count * 3; 922 } 923 924 while (count--) { 925 pix = *buf32++; 926 *buf++ = (char)(pix >> rshift); 927 *buf++ = (char)(pix >> gshift); 928 *buf++ = (char)(pix >> bshift); 929 } 930 } 931 932 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h) 933 { 934 int stream = 0; 935 ssize_t bytes; 936 937 #ifdef CONFIG_VNC_PNG 938 if (tight_can_send_png_rect(vs, w, h)) { 939 return send_png_rect(vs, x, y, w, h, NULL); 940 } 941 #endif 942 943 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 944 945 if (vs->tight.pixel24) { 946 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset); 947 bytes = 3; 948 } else { 949 bytes = vs->clientds.pf.bytes_per_pixel; 950 } 951 952 bytes = tight_compress_data(vs, stream, w * h * bytes, 953 tight_conf[vs->tight.compression].raw_zlib_level, 954 Z_DEFAULT_STRATEGY); 955 956 return (bytes >= 0); 957 } 958 959 static int send_solid_rect(VncState *vs) 960 { 961 size_t bytes; 962 963 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 964 965 if (vs->tight.pixel24) { 966 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset); 967 bytes = 3; 968 } else { 969 bytes = vs->clientds.pf.bytes_per_pixel; 970 } 971 972 vnc_write(vs, vs->tight.tight.buffer, bytes); 973 return 1; 974 } 975 976 static int send_mono_rect(VncState *vs, int x, int y, 977 int w, int h, uint32_t bg, uint32_t fg) 978 { 979 ssize_t bytes; 980 int stream = 1; 981 int level = tight_conf[vs->tight.compression].mono_zlib_level; 982 983 #ifdef CONFIG_VNC_PNG 984 if (tight_can_send_png_rect(vs, w, h)) { 985 int ret; 986 int bpp = vs->clientds.pf.bytes_per_pixel * 8; 987 VncPalette *palette = palette_new(2, bpp); 988 989 palette_put(palette, bg); 990 palette_put(palette, fg); 991 ret = send_png_rect(vs, x, y, w, h, palette); 992 palette_destroy(palette); 993 return ret; 994 } 995 #endif 996 997 bytes = ((w + 7) / 8) * h; 998 999 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1000 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1001 vnc_write_u8(vs, 1); 1002 1003 switch(vs->clientds.pf.bytes_per_pixel) { 1004 case 4: 1005 { 1006 uint32_t buf[2] = {bg, fg}; 1007 size_t ret = sizeof (buf); 1008 1009 if (vs->tight.pixel24) { 1010 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 1011 } 1012 vnc_write(vs, buf, ret); 1013 1014 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg); 1015 break; 1016 } 1017 case 2: 1018 vnc_write(vs, &bg, 2); 1019 vnc_write(vs, &fg, 2); 1020 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg); 1021 break; 1022 default: 1023 vnc_write_u8(vs, bg); 1024 vnc_write_u8(vs, fg); 1025 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg); 1026 break; 1027 } 1028 vs->tight.tight.offset = bytes; 1029 1030 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); 1031 return (bytes >= 0); 1032 } 1033 1034 struct palette_cb_priv { 1035 VncState *vs; 1036 uint8_t *header; 1037 #ifdef CONFIG_VNC_PNG 1038 png_colorp png_palette; 1039 #endif 1040 }; 1041 1042 static void write_palette(int idx, uint32_t color, void *opaque) 1043 { 1044 struct palette_cb_priv *priv = opaque; 1045 VncState *vs = priv->vs; 1046 uint32_t bytes = vs->clientds.pf.bytes_per_pixel; 1047 1048 if (bytes == 4) { 1049 ((uint32_t*)priv->header)[idx] = color; 1050 } else { 1051 ((uint16_t*)priv->header)[idx] = color; 1052 } 1053 } 1054 1055 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h) 1056 { 1057 int stream = 3; 1058 int level = tight_conf[vs->tight.compression].gradient_zlib_level; 1059 ssize_t bytes; 1060 1061 if (vs->clientds.pf.bytes_per_pixel == 1) 1062 return send_full_color_rect(vs, x, y, w, h); 1063 1064 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1065 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1066 1067 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int)); 1068 1069 if (vs->tight.pixel24) { 1070 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h); 1071 bytes = 3; 1072 } else if (vs->clientds.pf.bytes_per_pixel == 4) { 1073 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h); 1074 bytes = 4; 1075 } else { 1076 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h); 1077 bytes = 2; 1078 } 1079 1080 buffer_reset(&vs->tight.gradient); 1081 1082 bytes = w * h * bytes; 1083 vs->tight.tight.offset = bytes; 1084 1085 bytes = tight_compress_data(vs, stream, bytes, 1086 level, Z_FILTERED); 1087 return (bytes >= 0); 1088 } 1089 1090 static int send_palette_rect(VncState *vs, int x, int y, 1091 int w, int h, VncPalette *palette) 1092 { 1093 int stream = 2; 1094 int level = tight_conf[vs->tight.compression].idx_zlib_level; 1095 int colors; 1096 ssize_t bytes; 1097 1098 #ifdef CONFIG_VNC_PNG 1099 if (tight_can_send_png_rect(vs, w, h)) { 1100 return send_png_rect(vs, x, y, w, h, palette); 1101 } 1102 #endif 1103 1104 colors = palette_size(palette); 1105 1106 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1107 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1108 vnc_write_u8(vs, colors - 1); 1109 1110 switch(vs->clientds.pf.bytes_per_pixel) { 1111 case 4: 1112 { 1113 size_t old_offset, offset; 1114 uint32_t header[palette_size(palette)]; 1115 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1116 1117 old_offset = vs->output.offset; 1118 palette_iter(palette, write_palette, &priv); 1119 vnc_write(vs, header, sizeof(header)); 1120 1121 if (vs->tight.pixel24) { 1122 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1123 vs->output.offset = old_offset + offset; 1124 } 1125 1126 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1127 break; 1128 } 1129 case 2: 1130 { 1131 uint16_t header[palette_size(palette)]; 1132 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1133 1134 palette_iter(palette, write_palette, &priv); 1135 vnc_write(vs, header, sizeof(header)); 1136 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1137 break; 1138 } 1139 default: 1140 return -1; /* No palette for 8bits colors */ 1141 break; 1142 } 1143 bytes = w * h; 1144 vs->tight.tight.offset = bytes; 1145 1146 bytes = tight_compress_data(vs, stream, bytes, 1147 level, Z_DEFAULT_STRATEGY); 1148 return (bytes >= 0); 1149 } 1150 1151 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG) 1152 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y, 1153 int count) 1154 { 1155 VncDisplay *vd = vs->vd; 1156 uint32_t *fbptr; 1157 uint32_t pix; 1158 1159 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) + 1160 x * ds_get_bytes_per_pixel(vs->ds)); 1161 1162 while (count--) { 1163 pix = *fbptr++; 1164 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift); 1165 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift); 1166 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift); 1167 } 1168 } 1169 1170 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp) \ 1171 \ 1172 static void \ 1173 rgb_prepare_row##bpp(VncState *vs, uint8_t *dst, \ 1174 int x, int y, int count) \ 1175 { \ 1176 VncDisplay *vd = vs->vd; \ 1177 uint##bpp##_t *fbptr; \ 1178 uint##bpp##_t pix; \ 1179 int r, g, b; \ 1180 \ 1181 fbptr = (uint##bpp##_t *) \ 1182 (vd->server->data + y * ds_get_linesize(vs->ds) + \ 1183 x * ds_get_bytes_per_pixel(vs->ds)); \ 1184 \ 1185 while (count--) { \ 1186 pix = *fbptr++; \ 1187 \ 1188 r = (int)((pix >> vs->ds->surface->pf.rshift) \ 1189 & vs->ds->surface->pf.rmax); \ 1190 g = (int)((pix >> vs->ds->surface->pf.gshift) \ 1191 & vs->ds->surface->pf.gmax); \ 1192 b = (int)((pix >> vs->ds->surface->pf.bshift) \ 1193 & vs->ds->surface->pf.bmax); \ 1194 \ 1195 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \ 1196 / vs->ds->surface->pf.rmax); \ 1197 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \ 1198 / vs->ds->surface->pf.gmax); \ 1199 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \ 1200 / vs->ds->surface->pf.bmax); \ 1201 } \ 1202 } 1203 1204 DEFINE_RGB_GET_ROW_FUNCTION(16) 1205 DEFINE_RGB_GET_ROW_FUNCTION(32) 1206 1207 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y, 1208 int count) 1209 { 1210 if (ds_get_bytes_per_pixel(vs->ds) == 4) { 1211 if (vs->ds->surface->pf.rmax == 0xFF && 1212 vs->ds->surface->pf.gmax == 0xFF && 1213 vs->ds->surface->pf.bmax == 0xFF) { 1214 rgb_prepare_row24(vs, dst, x, y, count); 1215 } else { 1216 rgb_prepare_row32(vs, dst, x, y, count); 1217 } 1218 } else { 1219 rgb_prepare_row16(vs, dst, x, y, count); 1220 } 1221 } 1222 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */ 1223 1224 /* 1225 * JPEG compression stuff. 1226 */ 1227 #ifdef CONFIG_VNC_JPEG 1228 /* 1229 * Destination manager implementation for JPEG library. 1230 */ 1231 1232 /* This is called once per encoding */ 1233 static void jpeg_init_destination(j_compress_ptr cinfo) 1234 { 1235 VncState *vs = cinfo->client_data; 1236 Buffer *buffer = &vs->tight.jpeg; 1237 1238 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1239 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1240 } 1241 1242 /* This is called when we ran out of buffer (shouldn't happen!) */ 1243 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1244 { 1245 VncState *vs = cinfo->client_data; 1246 Buffer *buffer = &vs->tight.jpeg; 1247 1248 buffer->offset = buffer->capacity; 1249 buffer_reserve(buffer, 2048); 1250 jpeg_init_destination(cinfo); 1251 return TRUE; 1252 } 1253 1254 /* This is called when we are done processing data */ 1255 static void jpeg_term_destination(j_compress_ptr cinfo) 1256 { 1257 VncState *vs = cinfo->client_data; 1258 Buffer *buffer = &vs->tight.jpeg; 1259 1260 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1261 } 1262 1263 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) 1264 { 1265 struct jpeg_compress_struct cinfo; 1266 struct jpeg_error_mgr jerr; 1267 struct jpeg_destination_mgr manager; 1268 JSAMPROW row[1]; 1269 uint8_t *buf; 1270 int dy; 1271 1272 if (ds_get_bytes_per_pixel(vs->ds) == 1) 1273 return send_full_color_rect(vs, x, y, w, h); 1274 1275 buffer_reserve(&vs->tight.jpeg, 2048); 1276 1277 cinfo.err = jpeg_std_error(&jerr); 1278 jpeg_create_compress(&cinfo); 1279 1280 cinfo.client_data = vs; 1281 cinfo.image_width = w; 1282 cinfo.image_height = h; 1283 cinfo.input_components = 3; 1284 cinfo.in_color_space = JCS_RGB; 1285 1286 jpeg_set_defaults(&cinfo); 1287 jpeg_set_quality(&cinfo, quality, true); 1288 1289 manager.init_destination = jpeg_init_destination; 1290 manager.empty_output_buffer = jpeg_empty_output_buffer; 1291 manager.term_destination = jpeg_term_destination; 1292 cinfo.dest = &manager; 1293 1294 jpeg_start_compress(&cinfo, true); 1295 1296 buf = g_malloc(w * 3); 1297 row[0] = buf; 1298 for (dy = 0; dy < h; dy++) { 1299 rgb_prepare_row(vs, buf, x, y + dy, w); 1300 jpeg_write_scanlines(&cinfo, row, 1); 1301 } 1302 g_free(buf); 1303 1304 jpeg_finish_compress(&cinfo); 1305 jpeg_destroy_compress(&cinfo); 1306 1307 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1308 1309 tight_send_compact_size(vs, vs->tight.jpeg.offset); 1310 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset); 1311 buffer_reset(&vs->tight.jpeg); 1312 1313 return 1; 1314 } 1315 #endif /* CONFIG_VNC_JPEG */ 1316 1317 /* 1318 * PNG compression stuff. 1319 */ 1320 #ifdef CONFIG_VNC_PNG 1321 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1322 { 1323 struct palette_cb_priv *priv = opaque; 1324 VncState *vs = priv->vs; 1325 png_colorp color = &priv->png_palette[idx]; 1326 1327 if (vs->tight.pixel24) 1328 { 1329 color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax; 1330 color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax; 1331 color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax; 1332 } 1333 else 1334 { 1335 int red, green, blue; 1336 1337 red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax; 1338 green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax; 1339 blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax; 1340 color->red = ((red * 255 + vs->clientds.pf.rmax / 2) / 1341 vs->clientds.pf.rmax); 1342 color->green = ((green * 255 + vs->clientds.pf.gmax / 2) / 1343 vs->clientds.pf.gmax); 1344 color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) / 1345 vs->clientds.pf.bmax); 1346 } 1347 } 1348 1349 static void png_write_data(png_structp png_ptr, png_bytep data, 1350 png_size_t length) 1351 { 1352 VncState *vs = png_get_io_ptr(png_ptr); 1353 1354 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length); 1355 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length); 1356 1357 vs->tight.png.offset += length; 1358 } 1359 1360 static void png_flush_data(png_structp png_ptr) 1361 { 1362 } 1363 1364 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1365 { 1366 return g_malloc(size); 1367 } 1368 1369 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1370 { 1371 g_free(ptr); 1372 } 1373 1374 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 1375 VncPalette *palette) 1376 { 1377 png_byte color_type; 1378 png_structp png_ptr; 1379 png_infop info_ptr; 1380 png_colorp png_palette = NULL; 1381 int level = tight_png_conf[vs->tight.compression].png_zlib_level; 1382 int filters = tight_png_conf[vs->tight.compression].png_filters; 1383 uint8_t *buf; 1384 int dy; 1385 1386 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1387 NULL, vnc_png_malloc, vnc_png_free); 1388 1389 if (png_ptr == NULL) 1390 return -1; 1391 1392 info_ptr = png_create_info_struct(png_ptr); 1393 1394 if (info_ptr == NULL) { 1395 png_destroy_write_struct(&png_ptr, NULL); 1396 return -1; 1397 } 1398 1399 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data); 1400 png_set_compression_level(png_ptr, level); 1401 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1402 1403 if (palette) { 1404 color_type = PNG_COLOR_TYPE_PALETTE; 1405 } else { 1406 color_type = PNG_COLOR_TYPE_RGB; 1407 } 1408 1409 png_set_IHDR(png_ptr, info_ptr, w, h, 1410 8, color_type, PNG_INTERLACE_NONE, 1411 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1412 1413 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1414 struct palette_cb_priv priv; 1415 1416 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1417 palette_size(palette)); 1418 1419 priv.vs = vs; 1420 priv.png_palette = png_palette; 1421 palette_iter(palette, write_png_palette, &priv); 1422 1423 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1424 1425 if (vs->clientds.pf.bytes_per_pixel == 4) { 1426 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1427 } else { 1428 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1429 } 1430 } 1431 1432 png_write_info(png_ptr, info_ptr); 1433 1434 buffer_reserve(&vs->tight.png, 2048); 1435 buf = g_malloc(w * 3); 1436 for (dy = 0; dy < h; dy++) 1437 { 1438 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1439 memcpy(buf, vs->tight.tight.buffer + (dy * w), w); 1440 } else { 1441 rgb_prepare_row(vs, buf, x, y + dy, w); 1442 } 1443 png_write_row(png_ptr, buf); 1444 } 1445 g_free(buf); 1446 1447 png_write_end(png_ptr, NULL); 1448 1449 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1450 png_free(png_ptr, png_palette); 1451 } 1452 1453 png_destroy_write_struct(&png_ptr, &info_ptr); 1454 1455 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1456 1457 tight_send_compact_size(vs, vs->tight.png.offset); 1458 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset); 1459 buffer_reset(&vs->tight.png); 1460 return 1; 1461 } 1462 #endif /* CONFIG_VNC_PNG */ 1463 1464 static void vnc_tight_start(VncState *vs) 1465 { 1466 buffer_reset(&vs->tight.tight); 1467 1468 // make the output buffer be the zlib buffer, so we can compress it later 1469 vs->tight.tmp = vs->output; 1470 vs->output = vs->tight.tight; 1471 } 1472 1473 static void vnc_tight_stop(VncState *vs) 1474 { 1475 // switch back to normal output/zlib buffers 1476 vs->tight.tight = vs->output; 1477 vs->output = vs->tight.tmp; 1478 } 1479 1480 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h, 1481 int bg, int fg, int colors, VncPalette *palette) 1482 { 1483 int ret; 1484 1485 if (colors == 0) { 1486 if (tight_detect_smooth_image(vs, w, h)) { 1487 ret = send_gradient_rect(vs, x, y, w, h); 1488 } else { 1489 ret = send_full_color_rect(vs, x, y, w, h); 1490 } 1491 } else if (colors == 1) { 1492 ret = send_solid_rect(vs); 1493 } else if (colors == 2) { 1494 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1495 } else if (colors <= 256) { 1496 ret = send_palette_rect(vs, x, y, w, h, palette); 1497 } else { 1498 ret = 0; 1499 } 1500 return ret; 1501 } 1502 1503 #ifdef CONFIG_VNC_JPEG 1504 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h, 1505 int bg, int fg, int colors, 1506 VncPalette *palette, bool force) 1507 { 1508 int ret; 1509 1510 if (colors == 0) { 1511 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full && 1512 tight_detect_smooth_image(vs, w, h))) { 1513 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1514 1515 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1516 } else { 1517 ret = send_full_color_rect(vs, x, y, w, h); 1518 } 1519 } else if (colors == 1) { 1520 ret = send_solid_rect(vs); 1521 } else if (colors == 2) { 1522 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1523 } else if (colors <= 256) { 1524 if (force || (colors > 96 && 1525 tight_jpeg_conf[vs->tight.quality].jpeg_idx && 1526 tight_detect_smooth_image(vs, w, h))) { 1527 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1528 1529 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1530 } else { 1531 ret = send_palette_rect(vs, x, y, w, h, palette); 1532 } 1533 } else { 1534 ret = 0; 1535 } 1536 return ret; 1537 } 1538 #endif 1539 1540 static int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1541 { 1542 VncPalette *palette = NULL; 1543 uint32_t bg = 0, fg = 0; 1544 int colors; 1545 int ret = 0; 1546 #ifdef CONFIG_VNC_JPEG 1547 bool force_jpeg = false; 1548 bool allow_jpeg = true; 1549 #endif 1550 1551 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1552 1553 vnc_tight_start(vs); 1554 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1555 vnc_tight_stop(vs); 1556 1557 #ifdef CONFIG_VNC_JPEG 1558 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) { 1559 double freq = vnc_update_freq(vs, x, y, w, h); 1560 1561 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) { 1562 allow_jpeg = false; 1563 } 1564 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1565 force_jpeg = true; 1566 vnc_sent_lossy_rect(vs, x, y, w, h); 1567 } 1568 } 1569 #endif 1570 1571 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette); 1572 1573 #ifdef CONFIG_VNC_JPEG 1574 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) { 1575 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette, 1576 force_jpeg); 1577 } else { 1578 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1579 } 1580 #else 1581 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1582 #endif 1583 1584 palette_destroy(palette); 1585 return ret; 1586 } 1587 1588 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1589 { 1590 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1591 1592 vnc_tight_start(vs); 1593 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1594 vnc_tight_stop(vs); 1595 1596 return send_solid_rect(vs); 1597 } 1598 1599 static int send_rect_simple(VncState *vs, int x, int y, int w, int h, 1600 bool split) 1601 { 1602 int max_size, max_width; 1603 int max_sub_width, max_sub_height; 1604 int dx, dy; 1605 int rw, rh; 1606 int n = 0; 1607 1608 max_size = tight_conf[vs->tight.compression].max_rect_size; 1609 max_width = tight_conf[vs->tight.compression].max_rect_width; 1610 1611 if (split && (w > max_width || w * h > max_size)) { 1612 max_sub_width = (w > max_width) ? max_width : w; 1613 max_sub_height = max_size / max_sub_width; 1614 1615 for (dy = 0; dy < h; dy += max_sub_height) { 1616 for (dx = 0; dx < w; dx += max_width) { 1617 rw = MIN(max_sub_width, w - dx); 1618 rh = MIN(max_sub_height, h - dy); 1619 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1620 } 1621 } 1622 } else { 1623 n += send_sub_rect(vs, x, y, w, h); 1624 } 1625 1626 return n; 1627 } 1628 1629 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1630 int w, int h, int max_rows) 1631 { 1632 int dx, dy, dw, dh; 1633 int n = 0; 1634 1635 /* Try to find large solid-color areas and send them separately. */ 1636 1637 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1638 1639 /* If a rectangle becomes too large, send its upper part now. */ 1640 1641 if (dy - y >= max_rows) { 1642 n += send_rect_simple(vs, x, y, w, max_rows, true); 1643 y += max_rows; 1644 h -= max_rows; 1645 } 1646 1647 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1648 1649 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1650 uint32_t color_value; 1651 int x_best, y_best, w_best, h_best; 1652 1653 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1654 1655 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1656 continue ; 1657 } 1658 1659 /* Get dimensions of solid-color area. */ 1660 1661 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1662 color_value, &w_best, &h_best); 1663 1664 /* Make sure a solid rectangle is large enough 1665 (or the whole rectangle is of the same color). */ 1666 1667 if (w_best * h_best != w * h && 1668 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1669 continue; 1670 } 1671 1672 /* Try to extend solid rectangle to maximum size. */ 1673 1674 x_best = dx; y_best = dy; 1675 extend_solid_area(vs, x, y, w, h, color_value, 1676 &x_best, &y_best, &w_best, &h_best); 1677 1678 /* Send rectangles at top and left to solid-color area. */ 1679 1680 if (y_best != y) { 1681 n += send_rect_simple(vs, x, y, w, y_best-y, true); 1682 } 1683 if (x_best != x) { 1684 n += tight_send_framebuffer_update(vs, x, y_best, 1685 x_best-x, h_best); 1686 } 1687 1688 /* Send solid-color rectangle. */ 1689 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1690 1691 /* Send remaining rectangles (at right and bottom). */ 1692 1693 if (x_best + w_best != x + w) { 1694 n += tight_send_framebuffer_update(vs, x_best+w_best, 1695 y_best, 1696 w-(x_best-x)-w_best, 1697 h_best); 1698 } 1699 if (y_best + h_best != y + h) { 1700 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1701 w, h-(y_best-y)-h_best); 1702 } 1703 1704 /* Return after all recursive calls are done. */ 1705 return n; 1706 } 1707 } 1708 return n + send_rect_simple(vs, x, y, w, h, true); 1709 } 1710 1711 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1712 int w, int h) 1713 { 1714 int max_rows; 1715 1716 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF && 1717 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) { 1718 vs->tight.pixel24 = true; 1719 } else { 1720 vs->tight.pixel24 = false; 1721 } 1722 1723 #ifdef CONFIG_VNC_JPEG 1724 if (vs->tight.quality != (uint8_t)-1) { 1725 double freq = vnc_update_freq(vs, x, y, w, h); 1726 1727 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1728 return send_rect_simple(vs, x, y, w, h, false); 1729 } 1730 } 1731 #endif 1732 1733 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1734 return send_rect_simple(vs, x, y, w, h, true); 1735 } 1736 1737 /* Calculate maximum number of rows in one non-solid rectangle. */ 1738 1739 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1740 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1741 1742 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1743 } 1744 1745 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1746 int w, int h) 1747 { 1748 vs->tight.type = VNC_ENCODING_TIGHT; 1749 return tight_send_framebuffer_update(vs, x, y, w, h); 1750 } 1751 1752 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1753 int w, int h) 1754 { 1755 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1756 return tight_send_framebuffer_update(vs, x, y, w, h); 1757 } 1758 1759 void vnc_tight_clear(VncState *vs) 1760 { 1761 int i; 1762 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1763 if (vs->tight.stream[i].opaque) { 1764 deflateEnd(&vs->tight.stream[i]); 1765 } 1766 } 1767 1768 buffer_free(&vs->tight.tight); 1769 buffer_free(&vs->tight.zlib); 1770 buffer_free(&vs->tight.gradient); 1771 #ifdef CONFIG_VNC_JPEG 1772 buffer_free(&vs->tight.jpeg); 1773 #endif 1774 #ifdef CONFIG_VNC_PNG 1775 buffer_free(&vs->tight.png); 1776 #endif 1777 } 1778