1 /* 2 * QEMU VNC display driver: tight encoding 3 * 4 * From libvncserver/libvncserver/tight.c 5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved. 6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. 7 * 8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com> 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a copy 11 * of this software and associated documentation files (the "Software"), to deal 12 * in the Software without restriction, including without limitation the rights 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 14 * copies of the Software, and to permit persons to whom the Software is 15 * furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be included in 18 * all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 26 * THE SOFTWARE. 27 */ 28 29 #include "qemu/osdep.h" 30 31 /* This needs to be before jpeglib.h line because of conflict with 32 INT32 definitions between jmorecfg.h (included by jpeglib.h) and 33 Win32 basetsd.h (included by windows.h). */ 34 #include "qemu-common.h" 35 36 #ifdef CONFIG_VNC_PNG 37 /* The following define is needed by pngconf.h. Otherwise it won't compile, 38 because setjmp.h was already included by qemu-common.h. */ 39 #define PNG_SKIP_SETJMP_CHECK 40 #include <png.h> 41 #endif 42 #ifdef CONFIG_VNC_JPEG 43 #include <jpeglib.h> 44 #endif 45 46 #include "qemu/bswap.h" 47 #include "qapi/qmp/qint.h" 48 #include "vnc.h" 49 #include "vnc-enc-tight.h" 50 #include "vnc-palette.h" 51 52 /* Compression level stuff. The following array contains various 53 encoder parameters for each of 10 compression levels (0..9). 54 Last three parameters correspond to JPEG quality levels (0..9). */ 55 56 static const struct { 57 int max_rect_size, max_rect_width; 58 int mono_min_rect_size, gradient_min_rect_size; 59 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; 60 int gradient_threshold, gradient_threshold24; 61 int idx_max_colors_divisor; 62 int jpeg_quality, jpeg_threshold, jpeg_threshold24; 63 } tight_conf[] = { 64 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, 65 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, 66 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, 67 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, 68 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, 69 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, 70 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, 71 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, 72 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, 73 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } 74 }; 75 76 77 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 78 int w, int h); 79 80 #ifdef CONFIG_VNC_JPEG 81 static const struct { 82 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */ 83 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */ 84 int jpeg_idx; /* Allow indexed JPEG */ 85 int jpeg_full; /* Allow full color JPEG */ 86 } tight_jpeg_conf[] = { 87 { 0, 8, 1, 1 }, 88 { 0, 8, 1, 1 }, 89 { 0, 8, 1, 1 }, 90 { 0, 8, 1, 1 }, 91 { 0, 10, 1, 1 }, 92 { 0.1, 10, 1, 1 }, 93 { 0.2, 10, 1, 1 }, 94 { 0.3, 12, 0, 0 }, 95 { 0.4, 14, 0, 0 }, 96 { 0.5, 16, 0, 0 }, 97 }; 98 #endif 99 100 #ifdef CONFIG_VNC_PNG 101 static const struct { 102 int png_zlib_level, png_filters; 103 } tight_png_conf[] = { 104 { 0, PNG_NO_FILTERS }, 105 { 1, PNG_NO_FILTERS }, 106 { 2, PNG_NO_FILTERS }, 107 { 3, PNG_NO_FILTERS }, 108 { 4, PNG_NO_FILTERS }, 109 { 5, PNG_ALL_FILTERS }, 110 { 6, PNG_ALL_FILTERS }, 111 { 7, PNG_ALL_FILTERS }, 112 { 8, PNG_ALL_FILTERS }, 113 { 9, PNG_ALL_FILTERS }, 114 }; 115 116 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 117 VncPalette *palette); 118 119 static bool tight_can_send_png_rect(VncState *vs, int w, int h) 120 { 121 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) { 122 return false; 123 } 124 125 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 126 vs->client_pf.bytes_per_pixel == 1) { 127 return false; 128 } 129 130 return true; 131 } 132 #endif 133 134 /* 135 * Code to guess if given rectangle is suitable for smooth image 136 * compression (by applying "gradient" filter or JPEG coder). 137 */ 138 139 static unsigned int 140 tight_detect_smooth_image24(VncState *vs, int w, int h) 141 { 142 int off; 143 int x, y, d, dx; 144 unsigned int c; 145 unsigned int stats[256]; 146 int pixels = 0; 147 int pix, left[3]; 148 unsigned int errors; 149 unsigned char *buf = vs->tight.tight.buffer; 150 151 /* 152 * If client is big-endian, color samples begin from the second 153 * byte (offset 1) of a 32-bit pixel value. 154 */ 155 off = vs->client_be; 156 157 memset(stats, 0, sizeof (stats)); 158 159 for (y = 0, x = 0; y < h && x < w;) { 160 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; 161 d++) { 162 for (c = 0; c < 3; c++) { 163 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; 164 } 165 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { 166 for (c = 0; c < 3; c++) { 167 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; 168 stats[abs(pix - left[c])]++; 169 left[c] = pix; 170 } 171 pixels++; 172 } 173 } 174 if (w > h) { 175 x += h; 176 y = 0; 177 } else { 178 x = 0; 179 y += w; 180 } 181 } 182 183 if (pixels == 0) { 184 return 0; 185 } 186 187 /* 95% smooth or more ... */ 188 if (stats[0] * 33 / pixels >= 95) { 189 return 0; 190 } 191 192 errors = 0; 193 for (c = 1; c < 8; c++) { 194 errors += stats[c] * (c * c); 195 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 196 return 0; 197 } 198 } 199 for (; c < 256; c++) { 200 errors += stats[c] * (c * c); 201 } 202 errors /= (pixels * 3 - stats[0]); 203 204 return errors; 205 } 206 207 #define DEFINE_DETECT_FUNCTION(bpp) \ 208 \ 209 static unsigned int \ 210 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 211 bool endian; \ 212 uint##bpp##_t pix; \ 213 int max[3], shift[3]; \ 214 int x, y, d, dx; \ 215 unsigned int c; \ 216 unsigned int stats[256]; \ 217 int pixels = 0; \ 218 int sample, sum, left[3]; \ 219 unsigned int errors; \ 220 unsigned char *buf = vs->tight.tight.buffer; \ 221 \ 222 endian = 0; /* FIXME */ \ 223 \ 224 \ 225 max[0] = vs->client_pf.rmax; \ 226 max[1] = vs->client_pf.gmax; \ 227 max[2] = vs->client_pf.bmax; \ 228 shift[0] = vs->client_pf.rshift; \ 229 shift[1] = vs->client_pf.gshift; \ 230 shift[2] = vs->client_pf.bshift; \ 231 \ 232 memset(stats, 0, sizeof(stats)); \ 233 \ 234 y = 0, x = 0; \ 235 while (y < h && x < w) { \ 236 for (d = 0; d < h - y && \ 237 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 238 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 239 if (endian) { \ 240 pix = bswap##bpp(pix); \ 241 } \ 242 for (c = 0; c < 3; c++) { \ 243 left[c] = (int)(pix >> shift[c] & max[c]); \ 244 } \ 245 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 246 dx++) { \ 247 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 248 if (endian) { \ 249 pix = bswap##bpp(pix); \ 250 } \ 251 sum = 0; \ 252 for (c = 0; c < 3; c++) { \ 253 sample = (int)(pix >> shift[c] & max[c]); \ 254 sum += abs(sample - left[c]); \ 255 left[c] = sample; \ 256 } \ 257 if (sum > 255) { \ 258 sum = 255; \ 259 } \ 260 stats[sum]++; \ 261 pixels++; \ 262 } \ 263 } \ 264 if (w > h) { \ 265 x += h; \ 266 y = 0; \ 267 } else { \ 268 x = 0; \ 269 y += w; \ 270 } \ 271 } \ 272 if (pixels == 0) { \ 273 return 0; \ 274 } \ 275 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 276 return 0; \ 277 } \ 278 \ 279 errors = 0; \ 280 for (c = 1; c < 8; c++) { \ 281 errors += stats[c] * (c * c); \ 282 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 283 return 0; \ 284 } \ 285 } \ 286 for (; c < 256; c++) { \ 287 errors += stats[c] * (c * c); \ 288 } \ 289 errors /= (pixels - stats[0]); \ 290 \ 291 return errors; \ 292 } 293 294 DEFINE_DETECT_FUNCTION(16) 295 DEFINE_DETECT_FUNCTION(32) 296 297 static int 298 tight_detect_smooth_image(VncState *vs, int w, int h) 299 { 300 unsigned int errors; 301 int compression = vs->tight.compression; 302 int quality = vs->tight.quality; 303 304 if (!vs->vd->lossy) { 305 return 0; 306 } 307 308 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 309 vs->client_pf.bytes_per_pixel == 1 || 310 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 311 return 0; 312 } 313 314 if (vs->tight.quality != (uint8_t)-1) { 315 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 316 return 0; 317 } 318 } else { 319 if (w * h < tight_conf[compression].gradient_min_rect_size) { 320 return 0; 321 } 322 } 323 324 if (vs->client_pf.bytes_per_pixel == 4) { 325 if (vs->tight.pixel24) { 326 errors = tight_detect_smooth_image24(vs, w, h); 327 if (vs->tight.quality != (uint8_t)-1) { 328 return (errors < tight_conf[quality].jpeg_threshold24); 329 } 330 return (errors < tight_conf[compression].gradient_threshold24); 331 } else { 332 errors = tight_detect_smooth_image32(vs, w, h); 333 } 334 } else { 335 errors = tight_detect_smooth_image16(vs, w, h); 336 } 337 if (quality != (uint8_t)-1) { 338 return (errors < tight_conf[quality].jpeg_threshold); 339 } 340 return (errors < tight_conf[compression].gradient_threshold); 341 } 342 343 /* 344 * Code to determine how many different colors used in rectangle. 345 */ 346 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 347 \ 348 static int \ 349 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 350 int max, size_t count, \ 351 uint32_t *bg, uint32_t *fg, \ 352 VncPalette **palette) { \ 353 uint##bpp##_t *data; \ 354 uint##bpp##_t c0, c1, ci; \ 355 int i, n0, n1; \ 356 \ 357 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 358 \ 359 c0 = data[0]; \ 360 i = 1; \ 361 while (i < count && data[i] == c0) \ 362 i++; \ 363 if (i >= count) { \ 364 *bg = *fg = c0; \ 365 return 1; \ 366 } \ 367 \ 368 if (max < 2) { \ 369 return 0; \ 370 } \ 371 \ 372 n0 = i; \ 373 c1 = data[i]; \ 374 n1 = 0; \ 375 for (i++; i < count; i++) { \ 376 ci = data[i]; \ 377 if (ci == c0) { \ 378 n0++; \ 379 } else if (ci == c1) { \ 380 n1++; \ 381 } else \ 382 break; \ 383 } \ 384 if (i >= count) { \ 385 if (n0 > n1) { \ 386 *bg = (uint32_t)c0; \ 387 *fg = (uint32_t)c1; \ 388 } else { \ 389 *bg = (uint32_t)c1; \ 390 *fg = (uint32_t)c0; \ 391 } \ 392 return 2; \ 393 } \ 394 \ 395 if (max == 2) { \ 396 return 0; \ 397 } \ 398 \ 399 *palette = palette_new(max, bpp); \ 400 palette_put(*palette, c0); \ 401 palette_put(*palette, c1); \ 402 palette_put(*palette, ci); \ 403 \ 404 for (i++; i < count; i++) { \ 405 if (data[i] == ci) { \ 406 continue; \ 407 } else { \ 408 ci = data[i]; \ 409 if (!palette_put(*palette, (uint32_t)ci)) { \ 410 return 0; \ 411 } \ 412 } \ 413 } \ 414 \ 415 return palette_size(*palette); \ 416 } 417 418 DEFINE_FILL_PALETTE_FUNCTION(8) 419 DEFINE_FILL_PALETTE_FUNCTION(16) 420 DEFINE_FILL_PALETTE_FUNCTION(32) 421 422 static int tight_fill_palette(VncState *vs, int x, int y, 423 size_t count, uint32_t *bg, uint32_t *fg, 424 VncPalette **palette) 425 { 426 int max; 427 428 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 429 if (max < 2 && 430 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 431 max = 2; 432 } 433 if (max >= 256) { 434 max = 256; 435 } 436 437 switch (vs->client_pf.bytes_per_pixel) { 438 case 4: 439 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 440 case 2: 441 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 442 default: 443 max = 2; 444 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 445 } 446 return 0; 447 } 448 449 /* 450 * Converting truecolor samples into palette indices. 451 */ 452 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 453 \ 454 static void \ 455 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 456 VncPalette *palette) { \ 457 uint##bpp##_t *src; \ 458 uint##bpp##_t rgb; \ 459 int i, rep; \ 460 uint8_t idx; \ 461 \ 462 src = (uint##bpp##_t *) buf; \ 463 \ 464 for (i = 0; i < count; i++) { \ 465 \ 466 rgb = *src++; \ 467 rep = 0; \ 468 while (i < count && *src == rgb) { \ 469 rep++, src++, i++; \ 470 } \ 471 idx = palette_idx(palette, rgb); \ 472 /* \ 473 * Should never happen, but don't break everything \ 474 * if it does, use the first color instead \ 475 */ \ 476 if (idx == (uint8_t)-1) { \ 477 idx = 0; \ 478 } \ 479 while (rep >= 0) { \ 480 *buf++ = idx; \ 481 rep--; \ 482 } \ 483 } \ 484 } 485 486 DEFINE_IDX_ENCODE_FUNCTION(16) 487 DEFINE_IDX_ENCODE_FUNCTION(32) 488 489 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 490 \ 491 static void \ 492 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 493 uint##bpp##_t bg, uint##bpp##_t fg) { \ 494 uint##bpp##_t *ptr; \ 495 unsigned int value, mask; \ 496 int aligned_width; \ 497 int x, y, bg_bits; \ 498 \ 499 ptr = (uint##bpp##_t *) buf; \ 500 aligned_width = w - w % 8; \ 501 \ 502 for (y = 0; y < h; y++) { \ 503 for (x = 0; x < aligned_width; x += 8) { \ 504 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 505 if (*ptr++ != bg) { \ 506 break; \ 507 } \ 508 } \ 509 if (bg_bits == 8) { \ 510 *buf++ = 0; \ 511 continue; \ 512 } \ 513 mask = 0x80 >> bg_bits; \ 514 value = mask; \ 515 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 516 mask >>= 1; \ 517 if (*ptr++ != bg) { \ 518 value |= mask; \ 519 } \ 520 } \ 521 *buf++ = (uint8_t)value; \ 522 } \ 523 \ 524 mask = 0x80; \ 525 value = 0; \ 526 if (x >= w) { \ 527 continue; \ 528 } \ 529 \ 530 for (; x < w; x++) { \ 531 if (*ptr++ != bg) { \ 532 value |= mask; \ 533 } \ 534 mask >>= 1; \ 535 } \ 536 *buf++ = (uint8_t)value; \ 537 } \ 538 } 539 540 DEFINE_MONO_ENCODE_FUNCTION(8) 541 DEFINE_MONO_ENCODE_FUNCTION(16) 542 DEFINE_MONO_ENCODE_FUNCTION(32) 543 544 /* 545 * ``Gradient'' filter for 24-bit color samples. 546 * Should be called only when redMax, greenMax and blueMax are 255. 547 * Color components assumed to be byte-aligned. 548 */ 549 550 static void 551 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 552 { 553 uint32_t *buf32; 554 uint32_t pix32; 555 int shift[3]; 556 int *prev; 557 int here[3], upper[3], left[3], upperleft[3]; 558 int prediction; 559 int x, y, c; 560 561 buf32 = (uint32_t *)buf; 562 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 563 564 if (1 /* FIXME */) { 565 shift[0] = vs->client_pf.rshift; 566 shift[1] = vs->client_pf.gshift; 567 shift[2] = vs->client_pf.bshift; 568 } else { 569 shift[0] = 24 - vs->client_pf.rshift; 570 shift[1] = 24 - vs->client_pf.gshift; 571 shift[2] = 24 - vs->client_pf.bshift; 572 } 573 574 for (y = 0; y < h; y++) { 575 for (c = 0; c < 3; c++) { 576 upper[c] = 0; 577 here[c] = 0; 578 } 579 prev = (int *)vs->tight.gradient.buffer; 580 for (x = 0; x < w; x++) { 581 pix32 = *buf32++; 582 for (c = 0; c < 3; c++) { 583 upperleft[c] = upper[c]; 584 left[c] = here[c]; 585 upper[c] = *prev; 586 here[c] = (int)(pix32 >> shift[c] & 0xFF); 587 *prev++ = here[c]; 588 589 prediction = left[c] + upper[c] - upperleft[c]; 590 if (prediction < 0) { 591 prediction = 0; 592 } else if (prediction > 0xFF) { 593 prediction = 0xFF; 594 } 595 *buf++ = (char)(here[c] - prediction); 596 } 597 } 598 } 599 } 600 601 602 /* 603 * ``Gradient'' filter for other color depths. 604 */ 605 606 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 607 \ 608 static void \ 609 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 610 int w, int h) { \ 611 uint##bpp##_t pix, diff; \ 612 bool endian; \ 613 int *prev; \ 614 int max[3], shift[3]; \ 615 int here[3], upper[3], left[3], upperleft[3]; \ 616 int prediction; \ 617 int x, y, c; \ 618 \ 619 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 620 \ 621 endian = 0; /* FIXME */ \ 622 \ 623 max[0] = vs->client_pf.rmax; \ 624 max[1] = vs->client_pf.gmax; \ 625 max[2] = vs->client_pf.bmax; \ 626 shift[0] = vs->client_pf.rshift; \ 627 shift[1] = vs->client_pf.gshift; \ 628 shift[2] = vs->client_pf.bshift; \ 629 \ 630 for (y = 0; y < h; y++) { \ 631 for (c = 0; c < 3; c++) { \ 632 upper[c] = 0; \ 633 here[c] = 0; \ 634 } \ 635 prev = (int *)vs->tight.gradient.buffer; \ 636 for (x = 0; x < w; x++) { \ 637 pix = *buf; \ 638 if (endian) { \ 639 pix = bswap##bpp(pix); \ 640 } \ 641 diff = 0; \ 642 for (c = 0; c < 3; c++) { \ 643 upperleft[c] = upper[c]; \ 644 left[c] = here[c]; \ 645 upper[c] = *prev; \ 646 here[c] = (int)(pix >> shift[c] & max[c]); \ 647 *prev++ = here[c]; \ 648 \ 649 prediction = left[c] + upper[c] - upperleft[c]; \ 650 if (prediction < 0) { \ 651 prediction = 0; \ 652 } else if (prediction > max[c]) { \ 653 prediction = max[c]; \ 654 } \ 655 diff |= ((here[c] - prediction) & max[c]) \ 656 << shift[c]; \ 657 } \ 658 if (endian) { \ 659 diff = bswap##bpp(diff); \ 660 } \ 661 *buf++ = diff; \ 662 } \ 663 } \ 664 } 665 666 DEFINE_GRADIENT_FILTER_FUNCTION(16) 667 DEFINE_GRADIENT_FILTER_FUNCTION(32) 668 669 /* 670 * Check if a rectangle is all of the same color. If needSameColor is 671 * set to non-zero, then also check that its color equals to the 672 * *colorPtr value. The result is 1 if the test is successful, and in 673 * that case new color will be stored in *colorPtr. 674 */ 675 676 static bool 677 check_solid_tile32(VncState *vs, int x, int y, int w, int h, 678 uint32_t *color, bool samecolor) 679 { 680 VncDisplay *vd = vs->vd; 681 uint32_t *fbptr; 682 uint32_t c; 683 int dx, dy; 684 685 fbptr = vnc_server_fb_ptr(vd, x, y); 686 687 c = *fbptr; 688 if (samecolor && (uint32_t)c != *color) { 689 return false; 690 } 691 692 for (dy = 0; dy < h; dy++) { 693 for (dx = 0; dx < w; dx++) { 694 if (c != fbptr[dx]) { 695 return false; 696 } 697 } 698 fbptr = (uint32_t *) 699 ((uint8_t *)fbptr + vnc_server_fb_stride(vd)); 700 } 701 702 *color = (uint32_t)c; 703 return true; 704 } 705 706 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 707 uint32_t* color, bool samecolor) 708 { 709 switch (VNC_SERVER_FB_BYTES) { 710 case 4: 711 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 712 } 713 } 714 715 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 716 uint32_t color, int *w_ptr, int *h_ptr) 717 { 718 int dx, dy, dw, dh; 719 int w_prev; 720 int w_best = 0, h_best = 0; 721 722 w_prev = w; 723 724 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 725 726 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 727 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 728 729 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 730 break; 731 } 732 733 for (dx = x + dw; dx < x + w_prev;) { 734 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 735 736 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 737 break; 738 } 739 dx += dw; 740 } 741 742 w_prev = dx - x; 743 if (w_prev * (dy + dh - y) > w_best * h_best) { 744 w_best = w_prev; 745 h_best = dy + dh - y; 746 } 747 } 748 749 *w_ptr = w_best; 750 *h_ptr = h_best; 751 } 752 753 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 754 uint32_t color, int *x_ptr, int *y_ptr, 755 int *w_ptr, int *h_ptr) 756 { 757 int cx, cy; 758 759 /* Try to extend the area upwards. */ 760 for ( cy = *y_ptr - 1; 761 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 762 cy-- ); 763 *h_ptr += *y_ptr - (cy + 1); 764 *y_ptr = cy + 1; 765 766 /* ... downwards. */ 767 for ( cy = *y_ptr + *h_ptr; 768 cy < y + h && 769 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 770 cy++ ); 771 *h_ptr += cy - (*y_ptr + *h_ptr); 772 773 /* ... to the left. */ 774 for ( cx = *x_ptr - 1; 775 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 776 cx-- ); 777 *w_ptr += *x_ptr - (cx + 1); 778 *x_ptr = cx + 1; 779 780 /* ... to the right. */ 781 for ( cx = *x_ptr + *w_ptr; 782 cx < x + w && 783 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 784 cx++ ); 785 *w_ptr += cx - (*x_ptr + *w_ptr); 786 } 787 788 static int tight_init_stream(VncState *vs, int stream_id, 789 int level, int strategy) 790 { 791 z_streamp zstream = &vs->tight.stream[stream_id]; 792 793 if (zstream->opaque == NULL) { 794 int err; 795 796 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 797 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 798 zstream->zalloc = vnc_zlib_zalloc; 799 zstream->zfree = vnc_zlib_zfree; 800 801 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 802 MAX_MEM_LEVEL, strategy); 803 804 if (err != Z_OK) { 805 fprintf(stderr, "VNC: error initializing zlib\n"); 806 return -1; 807 } 808 809 vs->tight.levels[stream_id] = level; 810 zstream->opaque = vs; 811 } 812 813 if (vs->tight.levels[stream_id] != level) { 814 if (deflateParams(zstream, level, strategy) != Z_OK) { 815 return -1; 816 } 817 vs->tight.levels[stream_id] = level; 818 } 819 return 0; 820 } 821 822 static void tight_send_compact_size(VncState *vs, size_t len) 823 { 824 int lpc = 0; 825 int bytes = 0; 826 char buf[3] = {0, 0, 0}; 827 828 buf[bytes++] = len & 0x7F; 829 if (len > 0x7F) { 830 buf[bytes-1] |= 0x80; 831 buf[bytes++] = (len >> 7) & 0x7F; 832 if (len > 0x3FFF) { 833 buf[bytes-1] |= 0x80; 834 buf[bytes++] = (len >> 14) & 0xFF; 835 } 836 } 837 for (lpc = 0; lpc < bytes; lpc++) { 838 vnc_write_u8(vs, buf[lpc]); 839 } 840 } 841 842 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 843 int level, int strategy) 844 { 845 z_streamp zstream = &vs->tight.stream[stream_id]; 846 int previous_out; 847 848 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 849 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 850 return bytes; 851 } 852 853 if (tight_init_stream(vs, stream_id, level, strategy)) { 854 return -1; 855 } 856 857 /* reserve memory in output buffer */ 858 buffer_reserve(&vs->tight.zlib, bytes + 64); 859 860 /* set pointers */ 861 zstream->next_in = vs->tight.tight.buffer; 862 zstream->avail_in = vs->tight.tight.offset; 863 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 864 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 865 previous_out = zstream->avail_out; 866 zstream->data_type = Z_BINARY; 867 868 /* start encoding */ 869 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 870 fprintf(stderr, "VNC: error during tight compression\n"); 871 return -1; 872 } 873 874 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 875 /* ...how much data has actually been produced by deflate() */ 876 bytes = previous_out - zstream->avail_out; 877 878 tight_send_compact_size(vs, bytes); 879 vnc_write(vs, vs->tight.zlib.buffer, bytes); 880 881 buffer_reset(&vs->tight.zlib); 882 883 return bytes; 884 } 885 886 /* 887 * Subencoding implementations. 888 */ 889 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 890 { 891 uint32_t *buf32; 892 uint32_t pix; 893 int rshift, gshift, bshift; 894 895 buf32 = (uint32_t *)buf; 896 897 if (1 /* FIXME */) { 898 rshift = vs->client_pf.rshift; 899 gshift = vs->client_pf.gshift; 900 bshift = vs->client_pf.bshift; 901 } else { 902 rshift = 24 - vs->client_pf.rshift; 903 gshift = 24 - vs->client_pf.gshift; 904 bshift = 24 - vs->client_pf.bshift; 905 } 906 907 if (ret) { 908 *ret = count * 3; 909 } 910 911 while (count--) { 912 pix = *buf32++; 913 *buf++ = (char)(pix >> rshift); 914 *buf++ = (char)(pix >> gshift); 915 *buf++ = (char)(pix >> bshift); 916 } 917 } 918 919 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h) 920 { 921 int stream = 0; 922 ssize_t bytes; 923 924 #ifdef CONFIG_VNC_PNG 925 if (tight_can_send_png_rect(vs, w, h)) { 926 return send_png_rect(vs, x, y, w, h, NULL); 927 } 928 #endif 929 930 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 931 932 if (vs->tight.pixel24) { 933 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset); 934 bytes = 3; 935 } else { 936 bytes = vs->client_pf.bytes_per_pixel; 937 } 938 939 bytes = tight_compress_data(vs, stream, w * h * bytes, 940 tight_conf[vs->tight.compression].raw_zlib_level, 941 Z_DEFAULT_STRATEGY); 942 943 return (bytes >= 0); 944 } 945 946 static int send_solid_rect(VncState *vs) 947 { 948 size_t bytes; 949 950 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 951 952 if (vs->tight.pixel24) { 953 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset); 954 bytes = 3; 955 } else { 956 bytes = vs->client_pf.bytes_per_pixel; 957 } 958 959 vnc_write(vs, vs->tight.tight.buffer, bytes); 960 return 1; 961 } 962 963 static int send_mono_rect(VncState *vs, int x, int y, 964 int w, int h, uint32_t bg, uint32_t fg) 965 { 966 ssize_t bytes; 967 int stream = 1; 968 int level = tight_conf[vs->tight.compression].mono_zlib_level; 969 970 #ifdef CONFIG_VNC_PNG 971 if (tight_can_send_png_rect(vs, w, h)) { 972 int ret; 973 int bpp = vs->client_pf.bytes_per_pixel * 8; 974 VncPalette *palette = palette_new(2, bpp); 975 976 palette_put(palette, bg); 977 palette_put(palette, fg); 978 ret = send_png_rect(vs, x, y, w, h, palette); 979 palette_destroy(palette); 980 return ret; 981 } 982 #endif 983 984 bytes = ((w + 7) / 8) * h; 985 986 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 987 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 988 vnc_write_u8(vs, 1); 989 990 switch (vs->client_pf.bytes_per_pixel) { 991 case 4: 992 { 993 uint32_t buf[2] = {bg, fg}; 994 size_t ret = sizeof (buf); 995 996 if (vs->tight.pixel24) { 997 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 998 } 999 vnc_write(vs, buf, ret); 1000 1001 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg); 1002 break; 1003 } 1004 case 2: 1005 vnc_write(vs, &bg, 2); 1006 vnc_write(vs, &fg, 2); 1007 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg); 1008 break; 1009 default: 1010 vnc_write_u8(vs, bg); 1011 vnc_write_u8(vs, fg); 1012 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg); 1013 break; 1014 } 1015 vs->tight.tight.offset = bytes; 1016 1017 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); 1018 return (bytes >= 0); 1019 } 1020 1021 struct palette_cb_priv { 1022 VncState *vs; 1023 uint8_t *header; 1024 #ifdef CONFIG_VNC_PNG 1025 png_colorp png_palette; 1026 #endif 1027 }; 1028 1029 static void write_palette(int idx, uint32_t color, void *opaque) 1030 { 1031 struct palette_cb_priv *priv = opaque; 1032 VncState *vs = priv->vs; 1033 uint32_t bytes = vs->client_pf.bytes_per_pixel; 1034 1035 if (bytes == 4) { 1036 ((uint32_t*)priv->header)[idx] = color; 1037 } else { 1038 ((uint16_t*)priv->header)[idx] = color; 1039 } 1040 } 1041 1042 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h) 1043 { 1044 int stream = 3; 1045 int level = tight_conf[vs->tight.compression].gradient_zlib_level; 1046 ssize_t bytes; 1047 1048 if (vs->client_pf.bytes_per_pixel == 1) { 1049 return send_full_color_rect(vs, x, y, w, h); 1050 } 1051 1052 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1053 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1054 1055 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int)); 1056 1057 if (vs->tight.pixel24) { 1058 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h); 1059 bytes = 3; 1060 } else if (vs->client_pf.bytes_per_pixel == 4) { 1061 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h); 1062 bytes = 4; 1063 } else { 1064 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h); 1065 bytes = 2; 1066 } 1067 1068 buffer_reset(&vs->tight.gradient); 1069 1070 bytes = w * h * bytes; 1071 vs->tight.tight.offset = bytes; 1072 1073 bytes = tight_compress_data(vs, stream, bytes, 1074 level, Z_FILTERED); 1075 return (bytes >= 0); 1076 } 1077 1078 static int send_palette_rect(VncState *vs, int x, int y, 1079 int w, int h, VncPalette *palette) 1080 { 1081 int stream = 2; 1082 int level = tight_conf[vs->tight.compression].idx_zlib_level; 1083 int colors; 1084 ssize_t bytes; 1085 1086 #ifdef CONFIG_VNC_PNG 1087 if (tight_can_send_png_rect(vs, w, h)) { 1088 return send_png_rect(vs, x, y, w, h, palette); 1089 } 1090 #endif 1091 1092 colors = palette_size(palette); 1093 1094 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1095 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1096 vnc_write_u8(vs, colors - 1); 1097 1098 switch (vs->client_pf.bytes_per_pixel) { 1099 case 4: 1100 { 1101 size_t old_offset, offset; 1102 uint32_t header[palette_size(palette)]; 1103 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1104 1105 old_offset = vs->output.offset; 1106 palette_iter(palette, write_palette, &priv); 1107 vnc_write(vs, header, sizeof(header)); 1108 1109 if (vs->tight.pixel24) { 1110 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1111 vs->output.offset = old_offset + offset; 1112 } 1113 1114 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1115 break; 1116 } 1117 case 2: 1118 { 1119 uint16_t header[palette_size(palette)]; 1120 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1121 1122 palette_iter(palette, write_palette, &priv); 1123 vnc_write(vs, header, sizeof(header)); 1124 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1125 break; 1126 } 1127 default: 1128 return -1; /* No palette for 8bits colors */ 1129 break; 1130 } 1131 bytes = w * h; 1132 vs->tight.tight.offset = bytes; 1133 1134 bytes = tight_compress_data(vs, stream, bytes, 1135 level, Z_DEFAULT_STRATEGY); 1136 return (bytes >= 0); 1137 } 1138 1139 /* 1140 * JPEG compression stuff. 1141 */ 1142 #ifdef CONFIG_VNC_JPEG 1143 /* 1144 * Destination manager implementation for JPEG library. 1145 */ 1146 1147 /* This is called once per encoding */ 1148 static void jpeg_init_destination(j_compress_ptr cinfo) 1149 { 1150 VncState *vs = cinfo->client_data; 1151 Buffer *buffer = &vs->tight.jpeg; 1152 1153 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1154 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1155 } 1156 1157 /* This is called when we ran out of buffer (shouldn't happen!) */ 1158 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1159 { 1160 VncState *vs = cinfo->client_data; 1161 Buffer *buffer = &vs->tight.jpeg; 1162 1163 buffer->offset = buffer->capacity; 1164 buffer_reserve(buffer, 2048); 1165 jpeg_init_destination(cinfo); 1166 return TRUE; 1167 } 1168 1169 /* This is called when we are done processing data */ 1170 static void jpeg_term_destination(j_compress_ptr cinfo) 1171 { 1172 VncState *vs = cinfo->client_data; 1173 Buffer *buffer = &vs->tight.jpeg; 1174 1175 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1176 } 1177 1178 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) 1179 { 1180 struct jpeg_compress_struct cinfo; 1181 struct jpeg_error_mgr jerr; 1182 struct jpeg_destination_mgr manager; 1183 pixman_image_t *linebuf; 1184 JSAMPROW row[1]; 1185 uint8_t *buf; 1186 int dy; 1187 1188 if (surface_bytes_per_pixel(vs->vd->ds) == 1) { 1189 return send_full_color_rect(vs, x, y, w, h); 1190 } 1191 1192 buffer_reserve(&vs->tight.jpeg, 2048); 1193 1194 cinfo.err = jpeg_std_error(&jerr); 1195 jpeg_create_compress(&cinfo); 1196 1197 cinfo.client_data = vs; 1198 cinfo.image_width = w; 1199 cinfo.image_height = h; 1200 cinfo.input_components = 3; 1201 cinfo.in_color_space = JCS_RGB; 1202 1203 jpeg_set_defaults(&cinfo); 1204 jpeg_set_quality(&cinfo, quality, true); 1205 1206 manager.init_destination = jpeg_init_destination; 1207 manager.empty_output_buffer = jpeg_empty_output_buffer; 1208 manager.term_destination = jpeg_term_destination; 1209 cinfo.dest = &manager; 1210 1211 jpeg_start_compress(&cinfo, true); 1212 1213 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1214 buf = (uint8_t *)pixman_image_get_data(linebuf); 1215 row[0] = buf; 1216 for (dy = 0; dy < h; dy++) { 1217 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1218 jpeg_write_scanlines(&cinfo, row, 1); 1219 } 1220 qemu_pixman_image_unref(linebuf); 1221 1222 jpeg_finish_compress(&cinfo); 1223 jpeg_destroy_compress(&cinfo); 1224 1225 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1226 1227 tight_send_compact_size(vs, vs->tight.jpeg.offset); 1228 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset); 1229 buffer_reset(&vs->tight.jpeg); 1230 1231 return 1; 1232 } 1233 #endif /* CONFIG_VNC_JPEG */ 1234 1235 /* 1236 * PNG compression stuff. 1237 */ 1238 #ifdef CONFIG_VNC_PNG 1239 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1240 { 1241 struct palette_cb_priv *priv = opaque; 1242 VncState *vs = priv->vs; 1243 png_colorp color = &priv->png_palette[idx]; 1244 1245 if (vs->tight.pixel24) 1246 { 1247 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1248 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1249 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1250 } 1251 else 1252 { 1253 int red, green, blue; 1254 1255 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1256 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1257 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1258 color->red = ((red * 255 + vs->client_pf.rmax / 2) / 1259 vs->client_pf.rmax); 1260 color->green = ((green * 255 + vs->client_pf.gmax / 2) / 1261 vs->client_pf.gmax); 1262 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) / 1263 vs->client_pf.bmax); 1264 } 1265 } 1266 1267 static void png_write_data(png_structp png_ptr, png_bytep data, 1268 png_size_t length) 1269 { 1270 VncState *vs = png_get_io_ptr(png_ptr); 1271 1272 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length); 1273 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length); 1274 1275 vs->tight.png.offset += length; 1276 } 1277 1278 static void png_flush_data(png_structp png_ptr) 1279 { 1280 } 1281 1282 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1283 { 1284 return g_malloc(size); 1285 } 1286 1287 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1288 { 1289 g_free(ptr); 1290 } 1291 1292 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 1293 VncPalette *palette) 1294 { 1295 png_byte color_type; 1296 png_structp png_ptr; 1297 png_infop info_ptr; 1298 png_colorp png_palette = NULL; 1299 pixman_image_t *linebuf; 1300 int level = tight_png_conf[vs->tight.compression].png_zlib_level; 1301 int filters = tight_png_conf[vs->tight.compression].png_filters; 1302 uint8_t *buf; 1303 int dy; 1304 1305 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1306 NULL, vnc_png_malloc, vnc_png_free); 1307 1308 if (png_ptr == NULL) 1309 return -1; 1310 1311 info_ptr = png_create_info_struct(png_ptr); 1312 1313 if (info_ptr == NULL) { 1314 png_destroy_write_struct(&png_ptr, NULL); 1315 return -1; 1316 } 1317 1318 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data); 1319 png_set_compression_level(png_ptr, level); 1320 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1321 1322 if (palette) { 1323 color_type = PNG_COLOR_TYPE_PALETTE; 1324 } else { 1325 color_type = PNG_COLOR_TYPE_RGB; 1326 } 1327 1328 png_set_IHDR(png_ptr, info_ptr, w, h, 1329 8, color_type, PNG_INTERLACE_NONE, 1330 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1331 1332 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1333 struct palette_cb_priv priv; 1334 1335 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1336 palette_size(palette)); 1337 1338 priv.vs = vs; 1339 priv.png_palette = png_palette; 1340 palette_iter(palette, write_png_palette, &priv); 1341 1342 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1343 1344 if (vs->client_pf.bytes_per_pixel == 4) { 1345 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1346 } else { 1347 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1348 } 1349 } 1350 1351 png_write_info(png_ptr, info_ptr); 1352 1353 buffer_reserve(&vs->tight.png, 2048); 1354 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1355 buf = (uint8_t *)pixman_image_get_data(linebuf); 1356 for (dy = 0; dy < h; dy++) 1357 { 1358 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1359 memcpy(buf, vs->tight.tight.buffer + (dy * w), w); 1360 } else { 1361 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1362 } 1363 png_write_row(png_ptr, buf); 1364 } 1365 qemu_pixman_image_unref(linebuf); 1366 1367 png_write_end(png_ptr, NULL); 1368 1369 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1370 png_free(png_ptr, png_palette); 1371 } 1372 1373 png_destroy_write_struct(&png_ptr, &info_ptr); 1374 1375 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1376 1377 tight_send_compact_size(vs, vs->tight.png.offset); 1378 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset); 1379 buffer_reset(&vs->tight.png); 1380 return 1; 1381 } 1382 #endif /* CONFIG_VNC_PNG */ 1383 1384 static void vnc_tight_start(VncState *vs) 1385 { 1386 buffer_reset(&vs->tight.tight); 1387 1388 // make the output buffer be the zlib buffer, so we can compress it later 1389 vs->tight.tmp = vs->output; 1390 vs->output = vs->tight.tight; 1391 } 1392 1393 static void vnc_tight_stop(VncState *vs) 1394 { 1395 // switch back to normal output/zlib buffers 1396 vs->tight.tight = vs->output; 1397 vs->output = vs->tight.tmp; 1398 } 1399 1400 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h, 1401 int bg, int fg, int colors, VncPalette *palette) 1402 { 1403 int ret; 1404 1405 if (colors == 0) { 1406 if (tight_detect_smooth_image(vs, w, h)) { 1407 ret = send_gradient_rect(vs, x, y, w, h); 1408 } else { 1409 ret = send_full_color_rect(vs, x, y, w, h); 1410 } 1411 } else if (colors == 1) { 1412 ret = send_solid_rect(vs); 1413 } else if (colors == 2) { 1414 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1415 } else if (colors <= 256) { 1416 ret = send_palette_rect(vs, x, y, w, h, palette); 1417 } else { 1418 ret = 0; 1419 } 1420 return ret; 1421 } 1422 1423 #ifdef CONFIG_VNC_JPEG 1424 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h, 1425 int bg, int fg, int colors, 1426 VncPalette *palette, bool force) 1427 { 1428 int ret; 1429 1430 if (colors == 0) { 1431 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full && 1432 tight_detect_smooth_image(vs, w, h))) { 1433 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1434 1435 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1436 } else { 1437 ret = send_full_color_rect(vs, x, y, w, h); 1438 } 1439 } else if (colors == 1) { 1440 ret = send_solid_rect(vs); 1441 } else if (colors == 2) { 1442 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1443 } else if (colors <= 256) { 1444 if (force || (colors > 96 && 1445 tight_jpeg_conf[vs->tight.quality].jpeg_idx && 1446 tight_detect_smooth_image(vs, w, h))) { 1447 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1448 1449 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1450 } else { 1451 ret = send_palette_rect(vs, x, y, w, h, palette); 1452 } 1453 } else { 1454 ret = 0; 1455 } 1456 return ret; 1457 } 1458 #endif 1459 1460 static int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1461 { 1462 VncPalette *palette = NULL; 1463 uint32_t bg = 0, fg = 0; 1464 int colors; 1465 int ret = 0; 1466 #ifdef CONFIG_VNC_JPEG 1467 bool force_jpeg = false; 1468 bool allow_jpeg = true; 1469 #endif 1470 1471 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1472 1473 vnc_tight_start(vs); 1474 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1475 vnc_tight_stop(vs); 1476 1477 #ifdef CONFIG_VNC_JPEG 1478 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) { 1479 double freq = vnc_update_freq(vs, x, y, w, h); 1480 1481 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) { 1482 allow_jpeg = false; 1483 } 1484 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1485 force_jpeg = true; 1486 vnc_sent_lossy_rect(vs, x, y, w, h); 1487 } 1488 } 1489 #endif 1490 1491 colors = tight_fill_palette(vs, x, y, w * h, &bg, &fg, &palette); 1492 1493 #ifdef CONFIG_VNC_JPEG 1494 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) { 1495 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette, 1496 force_jpeg); 1497 } else { 1498 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1499 } 1500 #else 1501 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1502 #endif 1503 1504 palette_destroy(palette); 1505 return ret; 1506 } 1507 1508 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1509 { 1510 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1511 1512 vnc_tight_start(vs); 1513 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1514 vnc_tight_stop(vs); 1515 1516 return send_solid_rect(vs); 1517 } 1518 1519 static int send_rect_simple(VncState *vs, int x, int y, int w, int h, 1520 bool split) 1521 { 1522 int max_size, max_width; 1523 int max_sub_width, max_sub_height; 1524 int dx, dy; 1525 int rw, rh; 1526 int n = 0; 1527 1528 max_size = tight_conf[vs->tight.compression].max_rect_size; 1529 max_width = tight_conf[vs->tight.compression].max_rect_width; 1530 1531 if (split && (w > max_width || w * h > max_size)) { 1532 max_sub_width = (w > max_width) ? max_width : w; 1533 max_sub_height = max_size / max_sub_width; 1534 1535 for (dy = 0; dy < h; dy += max_sub_height) { 1536 for (dx = 0; dx < w; dx += max_width) { 1537 rw = MIN(max_sub_width, w - dx); 1538 rh = MIN(max_sub_height, h - dy); 1539 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1540 } 1541 } 1542 } else { 1543 n += send_sub_rect(vs, x, y, w, h); 1544 } 1545 1546 return n; 1547 } 1548 1549 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1550 int w, int h, int max_rows) 1551 { 1552 int dx, dy, dw, dh; 1553 int n = 0; 1554 1555 /* Try to find large solid-color areas and send them separately. */ 1556 1557 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1558 1559 /* If a rectangle becomes too large, send its upper part now. */ 1560 1561 if (dy - y >= max_rows) { 1562 n += send_rect_simple(vs, x, y, w, max_rows, true); 1563 y += max_rows; 1564 h -= max_rows; 1565 } 1566 1567 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1568 1569 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1570 uint32_t color_value; 1571 int x_best, y_best, w_best, h_best; 1572 1573 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1574 1575 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1576 continue ; 1577 } 1578 1579 /* Get dimensions of solid-color area. */ 1580 1581 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1582 color_value, &w_best, &h_best); 1583 1584 /* Make sure a solid rectangle is large enough 1585 (or the whole rectangle is of the same color). */ 1586 1587 if (w_best * h_best != w * h && 1588 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1589 continue; 1590 } 1591 1592 /* Try to extend solid rectangle to maximum size. */ 1593 1594 x_best = dx; y_best = dy; 1595 extend_solid_area(vs, x, y, w, h, color_value, 1596 &x_best, &y_best, &w_best, &h_best); 1597 1598 /* Send rectangles at top and left to solid-color area. */ 1599 1600 if (y_best != y) { 1601 n += send_rect_simple(vs, x, y, w, y_best-y, true); 1602 } 1603 if (x_best != x) { 1604 n += tight_send_framebuffer_update(vs, x, y_best, 1605 x_best-x, h_best); 1606 } 1607 1608 /* Send solid-color rectangle. */ 1609 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1610 1611 /* Send remaining rectangles (at right and bottom). */ 1612 1613 if (x_best + w_best != x + w) { 1614 n += tight_send_framebuffer_update(vs, x_best+w_best, 1615 y_best, 1616 w-(x_best-x)-w_best, 1617 h_best); 1618 } 1619 if (y_best + h_best != y + h) { 1620 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1621 w, h-(y_best-y)-h_best); 1622 } 1623 1624 /* Return after all recursive calls are done. */ 1625 return n; 1626 } 1627 } 1628 return n + send_rect_simple(vs, x, y, w, h, true); 1629 } 1630 1631 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1632 int w, int h) 1633 { 1634 int max_rows; 1635 1636 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF && 1637 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) { 1638 vs->tight.pixel24 = true; 1639 } else { 1640 vs->tight.pixel24 = false; 1641 } 1642 1643 #ifdef CONFIG_VNC_JPEG 1644 if (vs->tight.quality != (uint8_t)-1) { 1645 double freq = vnc_update_freq(vs, x, y, w, h); 1646 1647 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1648 return send_rect_simple(vs, x, y, w, h, false); 1649 } 1650 } 1651 #endif 1652 1653 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1654 return send_rect_simple(vs, x, y, w, h, true); 1655 } 1656 1657 /* Calculate maximum number of rows in one non-solid rectangle. */ 1658 1659 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1660 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1661 1662 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1663 } 1664 1665 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1666 int w, int h) 1667 { 1668 vs->tight.type = VNC_ENCODING_TIGHT; 1669 return tight_send_framebuffer_update(vs, x, y, w, h); 1670 } 1671 1672 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1673 int w, int h) 1674 { 1675 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1676 return tight_send_framebuffer_update(vs, x, y, w, h); 1677 } 1678 1679 void vnc_tight_clear(VncState *vs) 1680 { 1681 int i; 1682 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1683 if (vs->tight.stream[i].opaque) { 1684 deflateEnd(&vs->tight.stream[i]); 1685 } 1686 } 1687 1688 buffer_free(&vs->tight.tight); 1689 buffer_free(&vs->tight.zlib); 1690 buffer_free(&vs->tight.gradient); 1691 #ifdef CONFIG_VNC_JPEG 1692 buffer_free(&vs->tight.jpeg); 1693 #endif 1694 #ifdef CONFIG_VNC_PNG 1695 buffer_free(&vs->tight.png); 1696 #endif 1697 } 1698