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 #ifdef CONFIG_VNC_PNG 32 #include <png.h> 33 #endif 34 #ifdef CONFIG_VNC_JPEG 35 #include <stdio.h> 36 #include <jpeglib.h> 37 #endif 38 39 #include "qemu-common.h" 40 41 #include "bswap.h" 42 #include "qint.h" 43 #include "vnc.h" 44 #include "vnc-enc-tight.h" 45 #include "vnc-palette.h" 46 47 /* Compression level stuff. The following array contains various 48 encoder parameters for each of 10 compression levels (0..9). 49 Last three parameters correspond to JPEG quality levels (0..9). */ 50 51 static const struct { 52 int max_rect_size, max_rect_width; 53 int mono_min_rect_size, gradient_min_rect_size; 54 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; 55 int gradient_threshold, gradient_threshold24; 56 int idx_max_colors_divisor; 57 int jpeg_quality, jpeg_threshold, jpeg_threshold24; 58 } tight_conf[] = { 59 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, 60 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, 61 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, 62 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, 63 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, 64 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, 65 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, 66 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, 67 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, 68 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } 69 }; 70 71 72 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 73 int w, int h); 74 75 #ifdef CONFIG_VNC_PNG 76 static const struct { 77 int png_zlib_level, png_filters; 78 } tight_png_conf[] = { 79 { 0, PNG_NO_FILTERS }, 80 { 1, PNG_NO_FILTERS }, 81 { 2, PNG_NO_FILTERS }, 82 { 3, PNG_NO_FILTERS }, 83 { 4, PNG_NO_FILTERS }, 84 { 5, PNG_ALL_FILTERS }, 85 { 6, PNG_ALL_FILTERS }, 86 { 7, PNG_ALL_FILTERS }, 87 { 8, PNG_ALL_FILTERS }, 88 { 9, PNG_ALL_FILTERS }, 89 }; 90 91 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 92 VncPalette *palette); 93 94 static bool tight_can_send_png_rect(VncState *vs, int w, int h) 95 { 96 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) { 97 return false; 98 } 99 100 if (ds_get_bytes_per_pixel(vs->ds) == 1 || 101 vs->clientds.pf.bytes_per_pixel == 1) { 102 return false; 103 } 104 105 return true; 106 } 107 #endif 108 109 /* 110 * Code to guess if given rectangle is suitable for smooth image 111 * compression (by applying "gradient" filter or JPEG coder). 112 */ 113 114 static unsigned int 115 tight_detect_smooth_image24(VncState *vs, int w, int h) 116 { 117 int off; 118 int x, y, d, dx; 119 unsigned int c; 120 unsigned int stats[256]; 121 int pixels = 0; 122 int pix, left[3]; 123 unsigned int errors; 124 unsigned char *buf = vs->tight.tight.buffer; 125 126 /* 127 * If client is big-endian, color samples begin from the second 128 * byte (offset 1) of a 32-bit pixel value. 129 */ 130 off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG); 131 132 memset(stats, 0, sizeof (stats)); 133 134 for (y = 0, x = 0; y < h && x < w;) { 135 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; 136 d++) { 137 for (c = 0; c < 3; c++) { 138 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; 139 } 140 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { 141 for (c = 0; c < 3; c++) { 142 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; 143 stats[abs(pix - left[c])]++; 144 left[c] = pix; 145 } 146 pixels++; 147 } 148 } 149 if (w > h) { 150 x += h; 151 y = 0; 152 } else { 153 x = 0; 154 y += w; 155 } 156 } 157 158 /* 95% smooth or more ... */ 159 if (stats[0] * 33 / pixels >= 95) { 160 return 0; 161 } 162 163 errors = 0; 164 for (c = 1; c < 8; c++) { 165 errors += stats[c] * (c * c); 166 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 167 return 0; 168 } 169 } 170 for (; c < 256; c++) { 171 errors += stats[c] * (c * c); 172 } 173 errors /= (pixels * 3 - stats[0]); 174 175 return errors; 176 } 177 178 #define DEFINE_DETECT_FUNCTION(bpp) \ 179 \ 180 static unsigned int \ 181 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 182 bool endian; \ 183 uint##bpp##_t pix; \ 184 int max[3], shift[3]; \ 185 int x, y, d, dx; \ 186 unsigned int c; \ 187 unsigned int stats[256]; \ 188 int pixels = 0; \ 189 int sample, sum, left[3]; \ 190 unsigned int errors; \ 191 unsigned char *buf = vs->tight.tight.buffer; \ 192 \ 193 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 194 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ 195 \ 196 \ 197 max[0] = vs->clientds.pf.rmax; \ 198 max[1] = vs->clientds.pf.gmax; \ 199 max[2] = vs->clientds.pf.bmax; \ 200 shift[0] = vs->clientds.pf.rshift; \ 201 shift[1] = vs->clientds.pf.gshift; \ 202 shift[2] = vs->clientds.pf.bshift; \ 203 \ 204 memset(stats, 0, sizeof(stats)); \ 205 \ 206 y = 0, x = 0; \ 207 while (y < h && x < w) { \ 208 for (d = 0; d < h - y && \ 209 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 210 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 211 if (endian) { \ 212 pix = bswap##bpp(pix); \ 213 } \ 214 for (c = 0; c < 3; c++) { \ 215 left[c] = (int)(pix >> shift[c] & max[c]); \ 216 } \ 217 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 218 dx++) { \ 219 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 220 if (endian) { \ 221 pix = bswap##bpp(pix); \ 222 } \ 223 sum = 0; \ 224 for (c = 0; c < 3; c++) { \ 225 sample = (int)(pix >> shift[c] & max[c]); \ 226 sum += abs(sample - left[c]); \ 227 left[c] = sample; \ 228 } \ 229 if (sum > 255) { \ 230 sum = 255; \ 231 } \ 232 stats[sum]++; \ 233 pixels++; \ 234 } \ 235 } \ 236 if (w > h) { \ 237 x += h; \ 238 y = 0; \ 239 } else { \ 240 x = 0; \ 241 y += w; \ 242 } \ 243 } \ 244 \ 245 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 246 return 0; \ 247 } \ 248 \ 249 errors = 0; \ 250 for (c = 1; c < 8; c++) { \ 251 errors += stats[c] * (c * c); \ 252 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 253 return 0; \ 254 } \ 255 } \ 256 for (; c < 256; c++) { \ 257 errors += stats[c] * (c * c); \ 258 } \ 259 errors /= (pixels - stats[0]); \ 260 \ 261 return errors; \ 262 } 263 264 DEFINE_DETECT_FUNCTION(16) 265 DEFINE_DETECT_FUNCTION(32) 266 267 static int 268 tight_detect_smooth_image(VncState *vs, int w, int h) 269 { 270 unsigned int errors; 271 int compression = vs->tight.compression; 272 int quality = vs->tight.quality; 273 274 if (!vs->vd->lossy) { 275 return 0; 276 } 277 278 if (ds_get_bytes_per_pixel(vs->ds) == 1 || 279 vs->clientds.pf.bytes_per_pixel == 1 || 280 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 281 return 0; 282 } 283 284 if (vs->tight.quality != (uint8_t)-1) { 285 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 286 return 0; 287 } 288 } else { 289 if (w * h < tight_conf[compression].gradient_min_rect_size) { 290 return 0; 291 } 292 } 293 294 if (vs->clientds.pf.bytes_per_pixel == 4) { 295 if (vs->tight.pixel24) { 296 errors = tight_detect_smooth_image24(vs, w, h); 297 if (vs->tight.quality != (uint8_t)-1) { 298 return (errors < tight_conf[quality].jpeg_threshold24); 299 } 300 return (errors < tight_conf[compression].gradient_threshold24); 301 } else { 302 errors = tight_detect_smooth_image32(vs, w, h); 303 } 304 } else { 305 errors = tight_detect_smooth_image16(vs, w, h); 306 } 307 if (quality != -1) { 308 return (errors < tight_conf[quality].jpeg_threshold); 309 } 310 return (errors < tight_conf[compression].gradient_threshold); 311 } 312 313 /* 314 * Code to determine how many different colors used in rectangle. 315 */ 316 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 317 \ 318 static int \ 319 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 320 int max, size_t count, \ 321 uint32_t *bg, uint32_t *fg, \ 322 VncPalette **palette) { \ 323 uint##bpp##_t *data; \ 324 uint##bpp##_t c0, c1, ci; \ 325 int i, n0, n1; \ 326 \ 327 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 328 \ 329 c0 = data[0]; \ 330 i = 1; \ 331 while (i < count && data[i] == c0) \ 332 i++; \ 333 if (i >= count) { \ 334 *bg = *fg = c0; \ 335 return 1; \ 336 } \ 337 \ 338 if (max < 2) { \ 339 return 0; \ 340 } \ 341 \ 342 n0 = i; \ 343 c1 = data[i]; \ 344 n1 = 0; \ 345 for (i++; i < count; i++) { \ 346 ci = data[i]; \ 347 if (ci == c0) { \ 348 n0++; \ 349 } else if (ci == c1) { \ 350 n1++; \ 351 } else \ 352 break; \ 353 } \ 354 if (i >= count) { \ 355 if (n0 > n1) { \ 356 *bg = (uint32_t)c0; \ 357 *fg = (uint32_t)c1; \ 358 } else { \ 359 *bg = (uint32_t)c1; \ 360 *fg = (uint32_t)c0; \ 361 } \ 362 return 2; \ 363 } \ 364 \ 365 if (max == 2) { \ 366 return 0; \ 367 } \ 368 \ 369 *palette = palette_new(max, bpp); \ 370 palette_put(*palette, c0); \ 371 palette_put(*palette, c1); \ 372 palette_put(*palette, ci); \ 373 \ 374 for (i++; i < count; i++) { \ 375 if (data[i] == ci) { \ 376 continue; \ 377 } else { \ 378 ci = data[i]; \ 379 if (!palette_put(*palette, (uint32_t)ci)) { \ 380 return 0; \ 381 } \ 382 } \ 383 } \ 384 \ 385 return palette_size(*palette); \ 386 } 387 388 DEFINE_FILL_PALETTE_FUNCTION(8) 389 DEFINE_FILL_PALETTE_FUNCTION(16) 390 DEFINE_FILL_PALETTE_FUNCTION(32) 391 392 static int tight_fill_palette(VncState *vs, int x, int y, 393 size_t count, uint32_t *bg, uint32_t *fg, 394 VncPalette **palette) 395 { 396 int max; 397 398 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 399 if (max < 2 && 400 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 401 max = 2; 402 } 403 if (max >= 256) { 404 max = 256; 405 } 406 407 switch(vs->clientds.pf.bytes_per_pixel) { 408 case 4: 409 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 410 case 2: 411 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 412 default: 413 max = 2; 414 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 415 } 416 return 0; 417 } 418 419 /* 420 * Converting truecolor samples into palette indices. 421 */ 422 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 423 \ 424 static void \ 425 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 426 VncPalette *palette) { \ 427 uint##bpp##_t *src; \ 428 uint##bpp##_t rgb; \ 429 int i, rep; \ 430 uint8_t idx; \ 431 \ 432 src = (uint##bpp##_t *) buf; \ 433 \ 434 for (i = 0; i < count; i++) { \ 435 \ 436 rgb = *src++; \ 437 rep = 0; \ 438 while (i < count && *src == rgb) { \ 439 rep++, src++, i++; \ 440 } \ 441 idx = palette_idx(palette, rgb); \ 442 /* \ 443 * Should never happen, but don't break everything \ 444 * if it does, use the first color instead \ 445 */ \ 446 if (idx == (uint8_t)-1) { \ 447 idx = 0; \ 448 } \ 449 while (rep >= 0) { \ 450 *buf++ = idx; \ 451 rep--; \ 452 } \ 453 } \ 454 } 455 456 DEFINE_IDX_ENCODE_FUNCTION(16) 457 DEFINE_IDX_ENCODE_FUNCTION(32) 458 459 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 460 \ 461 static void \ 462 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 463 uint##bpp##_t bg, uint##bpp##_t fg) { \ 464 uint##bpp##_t *ptr; \ 465 unsigned int value, mask; \ 466 int aligned_width; \ 467 int x, y, bg_bits; \ 468 \ 469 ptr = (uint##bpp##_t *) buf; \ 470 aligned_width = w - w % 8; \ 471 \ 472 for (y = 0; y < h; y++) { \ 473 for (x = 0; x < aligned_width; x += 8) { \ 474 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 475 if (*ptr++ != bg) { \ 476 break; \ 477 } \ 478 } \ 479 if (bg_bits == 8) { \ 480 *buf++ = 0; \ 481 continue; \ 482 } \ 483 mask = 0x80 >> bg_bits; \ 484 value = mask; \ 485 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 486 mask >>= 1; \ 487 if (*ptr++ != bg) { \ 488 value |= mask; \ 489 } \ 490 } \ 491 *buf++ = (uint8_t)value; \ 492 } \ 493 \ 494 mask = 0x80; \ 495 value = 0; \ 496 if (x >= w) { \ 497 continue; \ 498 } \ 499 \ 500 for (; x < w; x++) { \ 501 if (*ptr++ != bg) { \ 502 value |= mask; \ 503 } \ 504 mask >>= 1; \ 505 } \ 506 *buf++ = (uint8_t)value; \ 507 } \ 508 } 509 510 DEFINE_MONO_ENCODE_FUNCTION(8) 511 DEFINE_MONO_ENCODE_FUNCTION(16) 512 DEFINE_MONO_ENCODE_FUNCTION(32) 513 514 /* 515 * ``Gradient'' filter for 24-bit color samples. 516 * Should be called only when redMax, greenMax and blueMax are 255. 517 * Color components assumed to be byte-aligned. 518 */ 519 520 static void 521 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 522 { 523 uint32_t *buf32; 524 uint32_t pix32; 525 int shift[3]; 526 int *prev; 527 int here[3], upper[3], left[3], upperleft[3]; 528 int prediction; 529 int x, y, c; 530 531 buf32 = (uint32_t *)buf; 532 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 533 534 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 535 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { 536 shift[0] = vs->clientds.pf.rshift; 537 shift[1] = vs->clientds.pf.gshift; 538 shift[2] = vs->clientds.pf.bshift; 539 } else { 540 shift[0] = 24 - vs->clientds.pf.rshift; 541 shift[1] = 24 - vs->clientds.pf.gshift; 542 shift[2] = 24 - vs->clientds.pf.bshift; 543 } 544 545 for (y = 0; y < h; y++) { 546 for (c = 0; c < 3; c++) { 547 upper[c] = 0; 548 here[c] = 0; 549 } 550 prev = (int *)vs->tight.gradient.buffer; 551 for (x = 0; x < w; x++) { 552 pix32 = *buf32++; 553 for (c = 0; c < 3; c++) { 554 upperleft[c] = upper[c]; 555 left[c] = here[c]; 556 upper[c] = *prev; 557 here[c] = (int)(pix32 >> shift[c] & 0xFF); 558 *prev++ = here[c]; 559 560 prediction = left[c] + upper[c] - upperleft[c]; 561 if (prediction < 0) { 562 prediction = 0; 563 } else if (prediction > 0xFF) { 564 prediction = 0xFF; 565 } 566 *buf++ = (char)(here[c] - prediction); 567 } 568 } 569 } 570 } 571 572 573 /* 574 * ``Gradient'' filter for other color depths. 575 */ 576 577 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 578 \ 579 static void \ 580 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 581 int w, int h) { \ 582 uint##bpp##_t pix, diff; \ 583 bool endian; \ 584 int *prev; \ 585 int max[3], shift[3]; \ 586 int here[3], upper[3], left[3], upperleft[3]; \ 587 int prediction; \ 588 int x, y, c; \ 589 \ 590 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 591 \ 592 endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 593 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); \ 594 \ 595 max[0] = vs->clientds.pf.rmax; \ 596 max[1] = vs->clientds.pf.gmax; \ 597 max[2] = vs->clientds.pf.bmax; \ 598 shift[0] = vs->clientds.pf.rshift; \ 599 shift[1] = vs->clientds.pf.gshift; \ 600 shift[2] = vs->clientds.pf.bshift; \ 601 \ 602 for (y = 0; y < h; y++) { \ 603 for (c = 0; c < 3; c++) { \ 604 upper[c] = 0; \ 605 here[c] = 0; \ 606 } \ 607 prev = (int *)vs->tight.gradient.buffer; \ 608 for (x = 0; x < w; x++) { \ 609 pix = *buf; \ 610 if (endian) { \ 611 pix = bswap##bpp(pix); \ 612 } \ 613 diff = 0; \ 614 for (c = 0; c < 3; c++) { \ 615 upperleft[c] = upper[c]; \ 616 left[c] = here[c]; \ 617 upper[c] = *prev; \ 618 here[c] = (int)(pix >> shift[c] & max[c]); \ 619 *prev++ = here[c]; \ 620 \ 621 prediction = left[c] + upper[c] - upperleft[c]; \ 622 if (prediction < 0) { \ 623 prediction = 0; \ 624 } else if (prediction > max[c]) { \ 625 prediction = max[c]; \ 626 } \ 627 diff |= ((here[c] - prediction) & max[c]) \ 628 << shift[c]; \ 629 } \ 630 if (endian) { \ 631 diff = bswap##bpp(diff); \ 632 } \ 633 *buf++ = diff; \ 634 } \ 635 } \ 636 } 637 638 DEFINE_GRADIENT_FILTER_FUNCTION(16) 639 DEFINE_GRADIENT_FILTER_FUNCTION(32) 640 641 /* 642 * Check if a rectangle is all of the same color. If needSameColor is 643 * set to non-zero, then also check that its color equals to the 644 * *colorPtr value. The result is 1 if the test is successful, and in 645 * that case new color will be stored in *colorPtr. 646 */ 647 648 #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \ 649 \ 650 static bool \ 651 check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \ 652 uint32_t* color, bool samecolor) \ 653 { \ 654 VncDisplay *vd = vs->vd; \ 655 uint##bpp##_t *fbptr; \ 656 uint##bpp##_t c; \ 657 int dx, dy; \ 658 \ 659 fbptr = (uint##bpp##_t *) \ 660 (vd->server->data + y * ds_get_linesize(vs->ds) + \ 661 x * ds_get_bytes_per_pixel(vs->ds)); \ 662 \ 663 c = *fbptr; \ 664 if (samecolor && (uint32_t)c != *color) { \ 665 return false; \ 666 } \ 667 \ 668 for (dy = 0; dy < h; dy++) { \ 669 for (dx = 0; dx < w; dx++) { \ 670 if (c != fbptr[dx]) { \ 671 return false; \ 672 } \ 673 } \ 674 fbptr = (uint##bpp##_t *) \ 675 ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \ 676 } \ 677 \ 678 *color = (uint32_t)c; \ 679 return true; \ 680 } 681 682 DEFINE_CHECK_SOLID_FUNCTION(32) 683 DEFINE_CHECK_SOLID_FUNCTION(16) 684 DEFINE_CHECK_SOLID_FUNCTION(8) 685 686 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 687 uint32_t* color, bool samecolor) 688 { 689 VncDisplay *vd = vs->vd; 690 691 switch(vd->server->pf.bytes_per_pixel) { 692 case 4: 693 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 694 case 2: 695 return check_solid_tile16(vs, x, y, w, h, color, samecolor); 696 default: 697 return check_solid_tile8(vs, x, y, w, h, color, samecolor); 698 } 699 } 700 701 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 702 uint32_t color, int *w_ptr, int *h_ptr) 703 { 704 int dx, dy, dw, dh; 705 int w_prev; 706 int w_best = 0, h_best = 0; 707 708 w_prev = w; 709 710 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 711 712 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 713 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 714 715 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 716 break; 717 } 718 719 for (dx = x + dw; dx < x + w_prev;) { 720 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 721 722 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 723 break; 724 } 725 dx += dw; 726 } 727 728 w_prev = dx - x; 729 if (w_prev * (dy + dh - y) > w_best * h_best) { 730 w_best = w_prev; 731 h_best = dy + dh - y; 732 } 733 } 734 735 *w_ptr = w_best; 736 *h_ptr = h_best; 737 } 738 739 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 740 uint32_t color, int *x_ptr, int *y_ptr, 741 int *w_ptr, int *h_ptr) 742 { 743 int cx, cy; 744 745 /* Try to extend the area upwards. */ 746 for ( cy = *y_ptr - 1; 747 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 748 cy-- ); 749 *h_ptr += *y_ptr - (cy + 1); 750 *y_ptr = cy + 1; 751 752 /* ... downwards. */ 753 for ( cy = *y_ptr + *h_ptr; 754 cy < y + h && 755 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 756 cy++ ); 757 *h_ptr += cy - (*y_ptr + *h_ptr); 758 759 /* ... to the left. */ 760 for ( cx = *x_ptr - 1; 761 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 762 cx-- ); 763 *w_ptr += *x_ptr - (cx + 1); 764 *x_ptr = cx + 1; 765 766 /* ... to the right. */ 767 for ( cx = *x_ptr + *w_ptr; 768 cx < x + w && 769 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 770 cx++ ); 771 *w_ptr += cx - (*x_ptr + *w_ptr); 772 } 773 774 static int tight_init_stream(VncState *vs, int stream_id, 775 int level, int strategy) 776 { 777 z_streamp zstream = &vs->tight.stream[stream_id]; 778 779 if (zstream->opaque == NULL) { 780 int err; 781 782 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 783 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 784 zstream->zalloc = vnc_zlib_zalloc; 785 zstream->zfree = vnc_zlib_zfree; 786 787 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 788 MAX_MEM_LEVEL, strategy); 789 790 if (err != Z_OK) { 791 fprintf(stderr, "VNC: error initializing zlib\n"); 792 return -1; 793 } 794 795 vs->tight.levels[stream_id] = level; 796 zstream->opaque = vs; 797 } 798 799 if (vs->tight.levels[stream_id] != level) { 800 if (deflateParams(zstream, level, strategy) != Z_OK) { 801 return -1; 802 } 803 vs->tight.levels[stream_id] = level; 804 } 805 return 0; 806 } 807 808 static void tight_send_compact_size(VncState *vs, size_t len) 809 { 810 int lpc = 0; 811 int bytes = 0; 812 char buf[3] = {0, 0, 0}; 813 814 buf[bytes++] = len & 0x7F; 815 if (len > 0x7F) { 816 buf[bytes-1] |= 0x80; 817 buf[bytes++] = (len >> 7) & 0x7F; 818 if (len > 0x3FFF) { 819 buf[bytes-1] |= 0x80; 820 buf[bytes++] = (len >> 14) & 0xFF; 821 } 822 } 823 for (lpc = 0; lpc < bytes; lpc++) { 824 vnc_write_u8(vs, buf[lpc]); 825 } 826 } 827 828 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 829 int level, int strategy) 830 { 831 z_streamp zstream = &vs->tight.stream[stream_id]; 832 int previous_out; 833 834 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 835 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 836 return bytes; 837 } 838 839 if (tight_init_stream(vs, stream_id, level, strategy)) { 840 return -1; 841 } 842 843 /* reserve memory in output buffer */ 844 buffer_reserve(&vs->tight.zlib, bytes + 64); 845 846 /* set pointers */ 847 zstream->next_in = vs->tight.tight.buffer; 848 zstream->avail_in = vs->tight.tight.offset; 849 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 850 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 851 zstream->data_type = Z_BINARY; 852 previous_out = zstream->total_out; 853 854 /* start encoding */ 855 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 856 fprintf(stderr, "VNC: error during tight compression\n"); 857 return -1; 858 } 859 860 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 861 bytes = zstream->total_out - previous_out; 862 863 tight_send_compact_size(vs, bytes); 864 vnc_write(vs, vs->tight.zlib.buffer, bytes); 865 866 buffer_reset(&vs->tight.zlib); 867 868 return bytes; 869 } 870 871 /* 872 * Subencoding implementations. 873 */ 874 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 875 { 876 uint32_t *buf32; 877 uint32_t pix; 878 int rshift, gshift, bshift; 879 880 buf32 = (uint32_t *)buf; 881 882 if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 883 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { 884 rshift = vs->clientds.pf.rshift; 885 gshift = vs->clientds.pf.gshift; 886 bshift = vs->clientds.pf.bshift; 887 } else { 888 rshift = 24 - vs->clientds.pf.rshift; 889 gshift = 24 - vs->clientds.pf.gshift; 890 bshift = 24 - vs->clientds.pf.bshift; 891 } 892 893 if (ret) { 894 *ret = count * 3; 895 } 896 897 while (count--) { 898 pix = *buf32++; 899 *buf++ = (char)(pix >> rshift); 900 *buf++ = (char)(pix >> gshift); 901 *buf++ = (char)(pix >> bshift); 902 } 903 } 904 905 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h) 906 { 907 int stream = 0; 908 ssize_t bytes; 909 910 #ifdef CONFIG_VNC_PNG 911 if (tight_can_send_png_rect(vs, w, h)) { 912 return send_png_rect(vs, x, y, w, h, NULL); 913 } 914 #endif 915 916 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 917 918 if (vs->tight.pixel24) { 919 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset); 920 bytes = 3; 921 } else { 922 bytes = vs->clientds.pf.bytes_per_pixel; 923 } 924 925 bytes = tight_compress_data(vs, stream, w * h * bytes, 926 tight_conf[vs->tight.compression].raw_zlib_level, 927 Z_DEFAULT_STRATEGY); 928 929 return (bytes >= 0); 930 } 931 932 static int send_solid_rect(VncState *vs) 933 { 934 size_t bytes; 935 936 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 937 938 if (vs->tight.pixel24) { 939 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset); 940 bytes = 3; 941 } else { 942 bytes = vs->clientds.pf.bytes_per_pixel; 943 } 944 945 vnc_write(vs, vs->tight.tight.buffer, bytes); 946 return 1; 947 } 948 949 static int send_mono_rect(VncState *vs, int x, int y, 950 int w, int h, uint32_t bg, uint32_t fg) 951 { 952 ssize_t bytes; 953 int stream = 1; 954 int level = tight_conf[vs->tight.compression].mono_zlib_level; 955 956 #ifdef CONFIG_VNC_PNG 957 if (tight_can_send_png_rect(vs, w, h)) { 958 int ret; 959 int bpp = vs->clientds.pf.bytes_per_pixel * 8; 960 VncPalette *palette = palette_new(2, bpp); 961 962 palette_put(palette, bg); 963 palette_put(palette, fg); 964 ret = send_png_rect(vs, x, y, w, h, palette); 965 palette_destroy(palette); 966 return ret; 967 } 968 #endif 969 970 bytes = ((w + 7) / 8) * h; 971 972 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 973 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 974 vnc_write_u8(vs, 1); 975 976 switch(vs->clientds.pf.bytes_per_pixel) { 977 case 4: 978 { 979 uint32_t buf[2] = {bg, fg}; 980 size_t ret = sizeof (buf); 981 982 if (vs->tight.pixel24) { 983 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 984 } 985 vnc_write(vs, buf, ret); 986 987 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg); 988 break; 989 } 990 case 2: 991 vnc_write(vs, &bg, 2); 992 vnc_write(vs, &fg, 2); 993 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg); 994 break; 995 default: 996 vnc_write_u8(vs, bg); 997 vnc_write_u8(vs, fg); 998 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg); 999 break; 1000 } 1001 vs->tight.tight.offset = bytes; 1002 1003 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); 1004 return (bytes >= 0); 1005 } 1006 1007 struct palette_cb_priv { 1008 VncState *vs; 1009 uint8_t *header; 1010 #ifdef CONFIG_VNC_PNG 1011 png_colorp png_palette; 1012 #endif 1013 }; 1014 1015 static void write_palette(int idx, uint32_t color, void *opaque) 1016 { 1017 struct palette_cb_priv *priv = opaque; 1018 VncState *vs = priv->vs; 1019 uint32_t bytes = vs->clientds.pf.bytes_per_pixel; 1020 1021 if (bytes == 4) { 1022 ((uint32_t*)priv->header)[idx] = color; 1023 } else { 1024 ((uint16_t*)priv->header)[idx] = color; 1025 } 1026 } 1027 1028 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h) 1029 { 1030 int stream = 3; 1031 int level = tight_conf[vs->tight.compression].gradient_zlib_level; 1032 ssize_t bytes; 1033 1034 if (vs->clientds.pf.bytes_per_pixel == 1) 1035 return send_full_color_rect(vs, x, y, w, h); 1036 1037 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1038 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1039 1040 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int)); 1041 1042 if (vs->tight.pixel24) { 1043 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h); 1044 bytes = 3; 1045 } else if (vs->clientds.pf.bytes_per_pixel == 4) { 1046 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h); 1047 bytes = 4; 1048 } else { 1049 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h); 1050 bytes = 2; 1051 } 1052 1053 buffer_reset(&vs->tight.gradient); 1054 1055 bytes = w * h * bytes; 1056 vs->tight.tight.offset = bytes; 1057 1058 bytes = tight_compress_data(vs, stream, bytes, 1059 level, Z_FILTERED); 1060 return (bytes >= 0); 1061 } 1062 1063 static int send_palette_rect(VncState *vs, int x, int y, 1064 int w, int h, VncPalette *palette) 1065 { 1066 int stream = 2; 1067 int level = tight_conf[vs->tight.compression].idx_zlib_level; 1068 int colors; 1069 ssize_t bytes; 1070 1071 #ifdef CONFIG_VNC_PNG 1072 if (tight_can_send_png_rect(vs, w, h)) { 1073 return send_png_rect(vs, x, y, w, h, palette); 1074 } 1075 #endif 1076 1077 colors = palette_size(palette); 1078 1079 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1080 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1081 vnc_write_u8(vs, colors - 1); 1082 1083 switch(vs->clientds.pf.bytes_per_pixel) { 1084 case 4: 1085 { 1086 size_t old_offset, offset; 1087 uint32_t header[palette_size(palette)]; 1088 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1089 1090 old_offset = vs->output.offset; 1091 palette_iter(palette, write_palette, &priv); 1092 vnc_write(vs, header, sizeof(header)); 1093 1094 if (vs->tight.pixel24) { 1095 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1096 vs->output.offset = old_offset + offset; 1097 } 1098 1099 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1100 break; 1101 } 1102 case 2: 1103 { 1104 uint16_t header[palette_size(palette)]; 1105 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1106 1107 palette_iter(palette, write_palette, &priv); 1108 vnc_write(vs, header, sizeof(header)); 1109 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1110 break; 1111 } 1112 default: 1113 return -1; /* No palette for 8bits colors */ 1114 break; 1115 } 1116 bytes = w * h; 1117 vs->tight.tight.offset = bytes; 1118 1119 bytes = tight_compress_data(vs, stream, bytes, 1120 level, Z_DEFAULT_STRATEGY); 1121 return (bytes >= 0); 1122 } 1123 1124 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG) 1125 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y, 1126 int count) 1127 { 1128 VncDisplay *vd = vs->vd; 1129 uint32_t *fbptr; 1130 uint32_t pix; 1131 1132 fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) + 1133 x * ds_get_bytes_per_pixel(vs->ds)); 1134 1135 while (count--) { 1136 pix = *fbptr++; 1137 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift); 1138 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift); 1139 *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift); 1140 } 1141 } 1142 1143 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp) \ 1144 \ 1145 static void \ 1146 rgb_prepare_row##bpp(VncState *vs, uint8_t *dst, \ 1147 int x, int y, int count) \ 1148 { \ 1149 VncDisplay *vd = vs->vd; \ 1150 uint##bpp##_t *fbptr; \ 1151 uint##bpp##_t pix; \ 1152 int r, g, b; \ 1153 \ 1154 fbptr = (uint##bpp##_t *) \ 1155 (vd->server->data + y * ds_get_linesize(vs->ds) + \ 1156 x * ds_get_bytes_per_pixel(vs->ds)); \ 1157 \ 1158 while (count--) { \ 1159 pix = *fbptr++; \ 1160 \ 1161 r = (int)((pix >> vs->ds->surface->pf.rshift) \ 1162 & vs->ds->surface->pf.rmax); \ 1163 g = (int)((pix >> vs->ds->surface->pf.gshift) \ 1164 & vs->ds->surface->pf.gmax); \ 1165 b = (int)((pix >> vs->ds->surface->pf.bshift) \ 1166 & vs->ds->surface->pf.bmax); \ 1167 \ 1168 *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \ 1169 / vs->ds->surface->pf.rmax); \ 1170 *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \ 1171 / vs->ds->surface->pf.gmax); \ 1172 *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \ 1173 / vs->ds->surface->pf.bmax); \ 1174 } \ 1175 } 1176 1177 DEFINE_RGB_GET_ROW_FUNCTION(16) 1178 DEFINE_RGB_GET_ROW_FUNCTION(32) 1179 1180 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y, 1181 int count) 1182 { 1183 if (ds_get_bytes_per_pixel(vs->ds) == 4) { 1184 if (vs->ds->surface->pf.rmax == 0xFF && 1185 vs->ds->surface->pf.gmax == 0xFF && 1186 vs->ds->surface->pf.bmax == 0xFF) { 1187 rgb_prepare_row24(vs, dst, x, y, count); 1188 } else { 1189 rgb_prepare_row32(vs, dst, x, y, count); 1190 } 1191 } else { 1192 rgb_prepare_row16(vs, dst, x, y, count); 1193 } 1194 } 1195 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */ 1196 1197 /* 1198 * JPEG compression stuff. 1199 */ 1200 #ifdef CONFIG_VNC_JPEG 1201 /* 1202 * Destination manager implementation for JPEG library. 1203 */ 1204 1205 /* This is called once per encoding */ 1206 static void jpeg_init_destination(j_compress_ptr cinfo) 1207 { 1208 VncState *vs = cinfo->client_data; 1209 Buffer *buffer = &vs->tight.jpeg; 1210 1211 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1212 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1213 } 1214 1215 /* This is called when we ran out of buffer (shouldn't happen!) */ 1216 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1217 { 1218 VncState *vs = cinfo->client_data; 1219 Buffer *buffer = &vs->tight.jpeg; 1220 1221 buffer->offset = buffer->capacity; 1222 buffer_reserve(buffer, 2048); 1223 jpeg_init_destination(cinfo); 1224 return TRUE; 1225 } 1226 1227 /* This is called when we are done processing data */ 1228 static void jpeg_term_destination(j_compress_ptr cinfo) 1229 { 1230 VncState *vs = cinfo->client_data; 1231 Buffer *buffer = &vs->tight.jpeg; 1232 1233 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1234 } 1235 1236 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) 1237 { 1238 struct jpeg_compress_struct cinfo; 1239 struct jpeg_error_mgr jerr; 1240 struct jpeg_destination_mgr manager; 1241 JSAMPROW row[1]; 1242 uint8_t *buf; 1243 int dy; 1244 1245 if (ds_get_bytes_per_pixel(vs->ds) == 1) 1246 return send_full_color_rect(vs, x, y, w, h); 1247 1248 buffer_reserve(&vs->tight.jpeg, 2048); 1249 1250 cinfo.err = jpeg_std_error(&jerr); 1251 jpeg_create_compress(&cinfo); 1252 1253 cinfo.client_data = vs; 1254 cinfo.image_width = w; 1255 cinfo.image_height = h; 1256 cinfo.input_components = 3; 1257 cinfo.in_color_space = JCS_RGB; 1258 1259 jpeg_set_defaults(&cinfo); 1260 jpeg_set_quality(&cinfo, quality, true); 1261 1262 manager.init_destination = jpeg_init_destination; 1263 manager.empty_output_buffer = jpeg_empty_output_buffer; 1264 manager.term_destination = jpeg_term_destination; 1265 cinfo.dest = &manager; 1266 1267 jpeg_start_compress(&cinfo, true); 1268 1269 buf = qemu_malloc(w * 3); 1270 row[0] = buf; 1271 for (dy = 0; dy < h; dy++) { 1272 rgb_prepare_row(vs, buf, x, y + dy, w); 1273 jpeg_write_scanlines(&cinfo, row, 1); 1274 } 1275 qemu_free(buf); 1276 1277 jpeg_finish_compress(&cinfo); 1278 jpeg_destroy_compress(&cinfo); 1279 1280 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1281 1282 tight_send_compact_size(vs, vs->tight.jpeg.offset); 1283 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset); 1284 buffer_reset(&vs->tight.jpeg); 1285 1286 return 1; 1287 } 1288 #endif /* CONFIG_VNC_JPEG */ 1289 1290 /* 1291 * PNG compression stuff. 1292 */ 1293 #ifdef CONFIG_VNC_PNG 1294 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1295 { 1296 struct palette_cb_priv *priv = opaque; 1297 VncState *vs = priv->vs; 1298 png_colorp color = &priv->png_palette[idx]; 1299 1300 if (vs->tight.pixel24) 1301 { 1302 color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax; 1303 color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax; 1304 color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax; 1305 } 1306 else 1307 { 1308 int red, green, blue; 1309 1310 red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax; 1311 green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax; 1312 blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax; 1313 color->red = ((red * 255 + vs->clientds.pf.rmax / 2) / 1314 vs->clientds.pf.rmax); 1315 color->green = ((green * 255 + vs->clientds.pf.gmax / 2) / 1316 vs->clientds.pf.gmax); 1317 color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) / 1318 vs->clientds.pf.bmax); 1319 } 1320 } 1321 1322 static void png_write_data(png_structp png_ptr, png_bytep data, 1323 png_size_t length) 1324 { 1325 VncState *vs = png_get_io_ptr(png_ptr); 1326 1327 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length); 1328 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length); 1329 1330 vs->tight.png.offset += length; 1331 } 1332 1333 static void png_flush_data(png_structp png_ptr) 1334 { 1335 } 1336 1337 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1338 { 1339 return qemu_malloc(size); 1340 } 1341 1342 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1343 { 1344 qemu_free(ptr); 1345 } 1346 1347 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 1348 VncPalette *palette) 1349 { 1350 png_byte color_type; 1351 png_structp png_ptr; 1352 png_infop info_ptr; 1353 png_colorp png_palette = NULL; 1354 int level = tight_png_conf[vs->tight.compression].png_zlib_level; 1355 int filters = tight_png_conf[vs->tight.compression].png_filters; 1356 uint8_t *buf; 1357 int dy; 1358 1359 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1360 NULL, vnc_png_malloc, vnc_png_free); 1361 1362 if (png_ptr == NULL) 1363 return -1; 1364 1365 info_ptr = png_create_info_struct(png_ptr); 1366 1367 if (info_ptr == NULL) { 1368 png_destroy_write_struct(&png_ptr, NULL); 1369 return -1; 1370 } 1371 1372 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data); 1373 png_set_compression_level(png_ptr, level); 1374 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1375 1376 if (palette) { 1377 color_type = PNG_COLOR_TYPE_PALETTE; 1378 } else { 1379 color_type = PNG_COLOR_TYPE_RGB; 1380 } 1381 1382 png_set_IHDR(png_ptr, info_ptr, w, h, 1383 8, color_type, PNG_INTERLACE_NONE, 1384 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1385 1386 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1387 struct palette_cb_priv priv; 1388 1389 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1390 palette_size(palette)); 1391 1392 priv.vs = vs; 1393 priv.png_palette = png_palette; 1394 palette_iter(palette, write_png_palette, &priv); 1395 1396 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1397 1398 if (vs->clientds.pf.bytes_per_pixel == 4) { 1399 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1400 } else { 1401 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1402 } 1403 } 1404 1405 png_write_info(png_ptr, info_ptr); 1406 1407 buffer_reserve(&vs->tight.png, 2048); 1408 buf = qemu_malloc(w * 3); 1409 for (dy = 0; dy < h; dy++) 1410 { 1411 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1412 memcpy(buf, vs->tight.tight.buffer + (dy * w), w); 1413 } else { 1414 rgb_prepare_row(vs, buf, x, y + dy, w); 1415 } 1416 png_write_row(png_ptr, buf); 1417 } 1418 qemu_free(buf); 1419 1420 png_write_end(png_ptr, NULL); 1421 1422 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1423 png_free(png_ptr, png_palette); 1424 } 1425 1426 png_destroy_write_struct(&png_ptr, &info_ptr); 1427 1428 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1429 1430 tight_send_compact_size(vs, vs->tight.png.offset); 1431 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset); 1432 buffer_reset(&vs->tight.png); 1433 return 1; 1434 } 1435 #endif /* CONFIG_VNC_PNG */ 1436 1437 static void vnc_tight_start(VncState *vs) 1438 { 1439 buffer_reset(&vs->tight.tight); 1440 1441 // make the output buffer be the zlib buffer, so we can compress it later 1442 vs->tight.tmp = vs->output; 1443 vs->output = vs->tight.tight; 1444 } 1445 1446 static void vnc_tight_stop(VncState *vs) 1447 { 1448 // switch back to normal output/zlib buffers 1449 vs->tight.tight = vs->output; 1450 vs->output = vs->tight.tmp; 1451 } 1452 1453 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h, 1454 int bg, int fg, int colors, VncPalette *palette) 1455 { 1456 int ret; 1457 1458 if (colors == 0) { 1459 if (tight_detect_smooth_image(vs, w, h)) { 1460 ret = send_gradient_rect(vs, x, y, w, h); 1461 } else { 1462 ret = send_full_color_rect(vs, x, y, w, h); 1463 } 1464 } else if (colors == 1) { 1465 ret = send_solid_rect(vs); 1466 } else if (colors == 2) { 1467 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1468 } else if (colors <= 256) { 1469 ret = send_palette_rect(vs, x, y, w, h, palette); 1470 } else { 1471 ret = 0; 1472 } 1473 return ret; 1474 } 1475 1476 #ifdef CONFIG_VNC_JPEG 1477 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h, 1478 int bg, int fg, int colors, 1479 VncPalette *palette) 1480 { 1481 int ret; 1482 1483 if (colors == 0) { 1484 if (tight_detect_smooth_image(vs, w, h)) { 1485 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1486 1487 ret = send_jpeg_rect(vs, x, y, w, h, quality); 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 if (colors > 96 && 1497 tight_detect_smooth_image(vs, w, h)) { 1498 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1499 1500 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1501 } else { 1502 ret = send_palette_rect(vs, x, y, w, h, palette); 1503 } 1504 } else { 1505 ret = 0; 1506 } 1507 return ret; 1508 } 1509 #endif 1510 1511 static int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1512 { 1513 VncPalette *palette = NULL; 1514 uint32_t bg = 0, fg = 0; 1515 int colors; 1516 int ret = 0; 1517 1518 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1519 1520 vnc_tight_start(vs); 1521 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1522 vnc_tight_stop(vs); 1523 1524 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette); 1525 1526 #ifdef CONFIG_VNC_JPEG 1527 if (vs->tight.quality != (uint8_t)-1) { 1528 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette); 1529 } else { 1530 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1531 } 1532 #else 1533 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1534 #endif 1535 1536 palette_destroy(palette); 1537 return ret; 1538 } 1539 1540 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1541 { 1542 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1543 1544 vnc_tight_start(vs); 1545 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1546 vnc_tight_stop(vs); 1547 1548 return send_solid_rect(vs); 1549 } 1550 1551 static int send_rect_simple(VncState *vs, int x, int y, int w, int h) 1552 { 1553 int max_size, max_width; 1554 int max_sub_width, max_sub_height; 1555 int dx, dy; 1556 int rw, rh; 1557 int n = 0; 1558 1559 max_size = tight_conf[vs->tight.compression].max_rect_size; 1560 max_width = tight_conf[vs->tight.compression].max_rect_width; 1561 1562 if (w > max_width || w * h > max_size) { 1563 max_sub_width = (w > max_width) ? max_width : w; 1564 max_sub_height = max_size / max_sub_width; 1565 1566 for (dy = 0; dy < h; dy += max_sub_height) { 1567 for (dx = 0; dx < w; dx += max_width) { 1568 rw = MIN(max_sub_width, w - dx); 1569 rh = MIN(max_sub_height, h - dy); 1570 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1571 } 1572 } 1573 } else { 1574 n += send_sub_rect(vs, x, y, w, h); 1575 } 1576 1577 return n; 1578 } 1579 1580 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1581 int w, int h, int max_rows) 1582 { 1583 int dx, dy, dw, dh; 1584 int n = 0; 1585 1586 /* Try to find large solid-color areas and send them separately. */ 1587 1588 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1589 1590 /* If a rectangle becomes too large, send its upper part now. */ 1591 1592 if (dy - y >= max_rows) { 1593 n += send_rect_simple(vs, x, y, w, max_rows); 1594 y += max_rows; 1595 h -= max_rows; 1596 } 1597 1598 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1599 1600 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1601 uint32_t color_value; 1602 int x_best, y_best, w_best, h_best; 1603 1604 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1605 1606 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1607 continue ; 1608 } 1609 1610 /* Get dimensions of solid-color area. */ 1611 1612 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1613 color_value, &w_best, &h_best); 1614 1615 /* Make sure a solid rectangle is large enough 1616 (or the whole rectangle is of the same color). */ 1617 1618 if (w_best * h_best != w * h && 1619 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1620 continue; 1621 } 1622 1623 /* Try to extend solid rectangle to maximum size. */ 1624 1625 x_best = dx; y_best = dy; 1626 extend_solid_area(vs, x, y, w, h, color_value, 1627 &x_best, &y_best, &w_best, &h_best); 1628 1629 /* Send rectangles at top and left to solid-color area. */ 1630 1631 if (y_best != y) { 1632 n += send_rect_simple(vs, x, y, w, y_best-y); 1633 } 1634 if (x_best != x) { 1635 n += tight_send_framebuffer_update(vs, x, y_best, 1636 x_best-x, h_best); 1637 } 1638 1639 /* Send solid-color rectangle. */ 1640 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1641 1642 /* Send remaining rectangles (at right and bottom). */ 1643 1644 if (x_best + w_best != x + w) { 1645 n += tight_send_framebuffer_update(vs, x_best+w_best, 1646 y_best, 1647 w-(x_best-x)-w_best, 1648 h_best); 1649 } 1650 if (y_best + h_best != y + h) { 1651 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1652 w, h-(y_best-y)-h_best); 1653 } 1654 1655 /* Return after all recursive calls are done. */ 1656 return n; 1657 } 1658 } 1659 return n + send_rect_simple(vs, x, y, w, h); 1660 } 1661 1662 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1663 int w, int h) 1664 { 1665 int max_rows; 1666 1667 if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF && 1668 vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) { 1669 vs->tight.pixel24 = true; 1670 } else { 1671 vs->tight.pixel24 = false; 1672 } 1673 1674 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) 1675 return send_rect_simple(vs, x, y, w, h); 1676 1677 /* Calculate maximum number of rows in one non-solid rectangle. */ 1678 1679 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1680 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1681 1682 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1683 } 1684 1685 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1686 int w, int h) 1687 { 1688 vs->tight.type = VNC_ENCODING_TIGHT; 1689 return tight_send_framebuffer_update(vs, x, y, w, h); 1690 } 1691 1692 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1693 int w, int h) 1694 { 1695 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1696 return tight_send_framebuffer_update(vs, x, y, w, h); 1697 } 1698 1699 void vnc_tight_clear(VncState *vs) 1700 { 1701 int i; 1702 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1703 if (vs->tight.stream[i].opaque) { 1704 deflateEnd(&vs->tight.stream[i]); 1705 } 1706 } 1707 1708 buffer_free(&vs->tight.tight); 1709 buffer_free(&vs->tight.zlib); 1710 buffer_free(&vs->tight.gradient); 1711 #ifdef CONFIG_VNC_JPEG 1712 buffer_free(&vs->tight.jpeg); 1713 #endif 1714 #ifdef CONFIG_VNC_PNG 1715 buffer_free(&vs->tight.png); 1716 #endif 1717 } 1718