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 "vnc.h" 48 #include "vnc-enc-tight.h" 49 #include "vnc-palette.h" 50 51 /* Compression level stuff. The following array contains various 52 encoder parameters for each of 10 compression levels (0..9). 53 Last three parameters correspond to JPEG quality levels (0..9). */ 54 55 static const struct { 56 int max_rect_size, max_rect_width; 57 int mono_min_rect_size, gradient_min_rect_size; 58 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; 59 int gradient_threshold, gradient_threshold24; 60 int idx_max_colors_divisor; 61 int jpeg_quality, jpeg_threshold, jpeg_threshold24; 62 } tight_conf[] = { 63 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, 64 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, 65 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, 66 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, 67 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, 68 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, 69 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, 70 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, 71 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, 72 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } 73 }; 74 75 76 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 77 int w, int h); 78 79 #ifdef CONFIG_VNC_JPEG 80 static const struct { 81 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */ 82 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */ 83 int jpeg_idx; /* Allow indexed JPEG */ 84 int jpeg_full; /* Allow full color JPEG */ 85 } tight_jpeg_conf[] = { 86 { 0, 8, 1, 1 }, 87 { 0, 8, 1, 1 }, 88 { 0, 8, 1, 1 }, 89 { 0, 8, 1, 1 }, 90 { 0, 10, 1, 1 }, 91 { 0.1, 10, 1, 1 }, 92 { 0.2, 10, 1, 1 }, 93 { 0.3, 12, 0, 0 }, 94 { 0.4, 14, 0, 0 }, 95 { 0.5, 16, 0, 0 }, 96 }; 97 #endif 98 99 #ifdef CONFIG_VNC_PNG 100 static const struct { 101 int png_zlib_level, png_filters; 102 } tight_png_conf[] = { 103 { 0, PNG_NO_FILTERS }, 104 { 1, PNG_NO_FILTERS }, 105 { 2, PNG_NO_FILTERS }, 106 { 3, PNG_NO_FILTERS }, 107 { 4, PNG_NO_FILTERS }, 108 { 5, PNG_ALL_FILTERS }, 109 { 6, PNG_ALL_FILTERS }, 110 { 7, PNG_ALL_FILTERS }, 111 { 8, PNG_ALL_FILTERS }, 112 { 9, PNG_ALL_FILTERS }, 113 }; 114 115 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 116 VncPalette *palette); 117 118 static bool tight_can_send_png_rect(VncState *vs, int w, int h) 119 { 120 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) { 121 return false; 122 } 123 124 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 125 vs->client_pf.bytes_per_pixel == 1) { 126 return false; 127 } 128 129 return true; 130 } 131 #endif 132 133 /* 134 * Code to guess if given rectangle is suitable for smooth image 135 * compression (by applying "gradient" filter or JPEG coder). 136 */ 137 138 static unsigned int 139 tight_detect_smooth_image24(VncState *vs, int w, int h) 140 { 141 int off; 142 int x, y, d, dx; 143 unsigned int c; 144 unsigned int stats[256]; 145 int pixels = 0; 146 int pix, left[3]; 147 unsigned int errors; 148 unsigned char *buf = vs->tight.tight.buffer; 149 150 /* 151 * If client is big-endian, color samples begin from the second 152 * byte (offset 1) of a 32-bit pixel value. 153 */ 154 off = vs->client_be; 155 156 memset(stats, 0, sizeof (stats)); 157 158 for (y = 0, x = 0; y < h && x < w;) { 159 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; 160 d++) { 161 for (c = 0; c < 3; c++) { 162 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; 163 } 164 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { 165 for (c = 0; c < 3; c++) { 166 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; 167 stats[abs(pix - left[c])]++; 168 left[c] = pix; 169 } 170 pixels++; 171 } 172 } 173 if (w > h) { 174 x += h; 175 y = 0; 176 } else { 177 x = 0; 178 y += w; 179 } 180 } 181 182 if (pixels == 0) { 183 return 0; 184 } 185 186 /* 95% smooth or more ... */ 187 if (stats[0] * 33 / pixels >= 95) { 188 return 0; 189 } 190 191 errors = 0; 192 for (c = 1; c < 8; c++) { 193 errors += stats[c] * (c * c); 194 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 195 return 0; 196 } 197 } 198 for (; c < 256; c++) { 199 errors += stats[c] * (c * c); 200 } 201 errors /= (pixels * 3 - stats[0]); 202 203 return errors; 204 } 205 206 #define DEFINE_DETECT_FUNCTION(bpp) \ 207 \ 208 static unsigned int \ 209 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 210 bool endian; \ 211 uint##bpp##_t pix; \ 212 int max[3], shift[3]; \ 213 int x, y, d, dx; \ 214 unsigned int c; \ 215 unsigned int stats[256]; \ 216 int pixels = 0; \ 217 int sample, sum, left[3]; \ 218 unsigned int errors; \ 219 unsigned char *buf = vs->tight.tight.buffer; \ 220 \ 221 endian = 0; /* FIXME */ \ 222 \ 223 \ 224 max[0] = vs->client_pf.rmax; \ 225 max[1] = vs->client_pf.gmax; \ 226 max[2] = vs->client_pf.bmax; \ 227 shift[0] = vs->client_pf.rshift; \ 228 shift[1] = vs->client_pf.gshift; \ 229 shift[2] = vs->client_pf.bshift; \ 230 \ 231 memset(stats, 0, sizeof(stats)); \ 232 \ 233 y = 0, x = 0; \ 234 while (y < h && x < w) { \ 235 for (d = 0; d < h - y && \ 236 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 237 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 238 if (endian) { \ 239 pix = bswap##bpp(pix); \ 240 } \ 241 for (c = 0; c < 3; c++) { \ 242 left[c] = (int)(pix >> shift[c] & max[c]); \ 243 } \ 244 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 245 dx++) { \ 246 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 247 if (endian) { \ 248 pix = bswap##bpp(pix); \ 249 } \ 250 sum = 0; \ 251 for (c = 0; c < 3; c++) { \ 252 sample = (int)(pix >> shift[c] & max[c]); \ 253 sum += abs(sample - left[c]); \ 254 left[c] = sample; \ 255 } \ 256 if (sum > 255) { \ 257 sum = 255; \ 258 } \ 259 stats[sum]++; \ 260 pixels++; \ 261 } \ 262 } \ 263 if (w > h) { \ 264 x += h; \ 265 y = 0; \ 266 } else { \ 267 x = 0; \ 268 y += w; \ 269 } \ 270 } \ 271 if (pixels == 0) { \ 272 return 0; \ 273 } \ 274 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 275 return 0; \ 276 } \ 277 \ 278 errors = 0; \ 279 for (c = 1; c < 8; c++) { \ 280 errors += stats[c] * (c * c); \ 281 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 282 return 0; \ 283 } \ 284 } \ 285 for (; c < 256; c++) { \ 286 errors += stats[c] * (c * c); \ 287 } \ 288 errors /= (pixels - stats[0]); \ 289 \ 290 return errors; \ 291 } 292 293 DEFINE_DETECT_FUNCTION(16) 294 DEFINE_DETECT_FUNCTION(32) 295 296 static int 297 tight_detect_smooth_image(VncState *vs, int w, int h) 298 { 299 unsigned int errors; 300 int compression = vs->tight.compression; 301 int quality = vs->tight.quality; 302 303 if (!vs->vd->lossy) { 304 return 0; 305 } 306 307 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 308 vs->client_pf.bytes_per_pixel == 1 || 309 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 310 return 0; 311 } 312 313 if (vs->tight.quality != (uint8_t)-1) { 314 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 315 return 0; 316 } 317 } else { 318 if (w * h < tight_conf[compression].gradient_min_rect_size) { 319 return 0; 320 } 321 } 322 323 if (vs->client_pf.bytes_per_pixel == 4) { 324 if (vs->tight.pixel24) { 325 errors = tight_detect_smooth_image24(vs, w, h); 326 if (vs->tight.quality != (uint8_t)-1) { 327 return (errors < tight_conf[quality].jpeg_threshold24); 328 } 329 return (errors < tight_conf[compression].gradient_threshold24); 330 } else { 331 errors = tight_detect_smooth_image32(vs, w, h); 332 } 333 } else { 334 errors = tight_detect_smooth_image16(vs, w, h); 335 } 336 if (quality != (uint8_t)-1) { 337 return (errors < tight_conf[quality].jpeg_threshold); 338 } 339 return (errors < tight_conf[compression].gradient_threshold); 340 } 341 342 /* 343 * Code to determine how many different colors used in rectangle. 344 */ 345 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 346 \ 347 static int \ 348 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 349 int max, size_t count, \ 350 uint32_t *bg, uint32_t *fg, \ 351 VncPalette *palette) { \ 352 uint##bpp##_t *data; \ 353 uint##bpp##_t c0, c1, ci; \ 354 int i, n0, n1; \ 355 \ 356 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 357 \ 358 c0 = data[0]; \ 359 i = 1; \ 360 while (i < count && data[i] == c0) \ 361 i++; \ 362 if (i >= count) { \ 363 *bg = *fg = c0; \ 364 return 1; \ 365 } \ 366 \ 367 if (max < 2) { \ 368 return 0; \ 369 } \ 370 \ 371 n0 = i; \ 372 c1 = data[i]; \ 373 n1 = 0; \ 374 for (i++; i < count; i++) { \ 375 ci = data[i]; \ 376 if (ci == c0) { \ 377 n0++; \ 378 } else if (ci == c1) { \ 379 n1++; \ 380 } else \ 381 break; \ 382 } \ 383 if (i >= count) { \ 384 if (n0 > n1) { \ 385 *bg = (uint32_t)c0; \ 386 *fg = (uint32_t)c1; \ 387 } else { \ 388 *bg = (uint32_t)c1; \ 389 *fg = (uint32_t)c0; \ 390 } \ 391 return 2; \ 392 } \ 393 \ 394 if (max == 2) { \ 395 return 0; \ 396 } \ 397 \ 398 palette_init(palette, max, bpp); \ 399 palette_put(palette, c0); \ 400 palette_put(palette, c1); \ 401 palette_put(palette, ci); \ 402 \ 403 for (i++; i < count; i++) { \ 404 if (data[i] == ci) { \ 405 continue; \ 406 } else { \ 407 ci = data[i]; \ 408 if (!palette_put(palette, (uint32_t)ci)) { \ 409 return 0; \ 410 } \ 411 } \ 412 } \ 413 \ 414 return palette_size(palette); \ 415 } 416 417 DEFINE_FILL_PALETTE_FUNCTION(8) 418 DEFINE_FILL_PALETTE_FUNCTION(16) 419 DEFINE_FILL_PALETTE_FUNCTION(32) 420 421 static int tight_fill_palette(VncState *vs, int x, int y, 422 size_t count, uint32_t *bg, uint32_t *fg, 423 VncPalette *palette) 424 { 425 int max; 426 427 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 428 if (max < 2 && 429 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 430 max = 2; 431 } 432 if (max >= 256) { 433 max = 256; 434 } 435 436 switch (vs->client_pf.bytes_per_pixel) { 437 case 4: 438 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 439 case 2: 440 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 441 default: 442 max = 2; 443 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 444 } 445 return 0; 446 } 447 448 /* 449 * Converting truecolor samples into palette indices. 450 */ 451 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 452 \ 453 static void \ 454 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 455 VncPalette *palette) { \ 456 uint##bpp##_t *src; \ 457 uint##bpp##_t rgb; \ 458 int i, rep; \ 459 uint8_t idx; \ 460 \ 461 src = (uint##bpp##_t *) buf; \ 462 \ 463 for (i = 0; i < count; ) { \ 464 \ 465 rgb = *src++; \ 466 i++; \ 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 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4); 710 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 711 } 712 713 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 714 uint32_t color, int *w_ptr, int *h_ptr) 715 { 716 int dx, dy, dw, dh; 717 int w_prev; 718 int w_best = 0, h_best = 0; 719 720 w_prev = w; 721 722 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 723 724 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 725 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 726 727 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 728 break; 729 } 730 731 for (dx = x + dw; dx < x + w_prev;) { 732 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 733 734 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 735 break; 736 } 737 dx += dw; 738 } 739 740 w_prev = dx - x; 741 if (w_prev * (dy + dh - y) > w_best * h_best) { 742 w_best = w_prev; 743 h_best = dy + dh - y; 744 } 745 } 746 747 *w_ptr = w_best; 748 *h_ptr = h_best; 749 } 750 751 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 752 uint32_t color, int *x_ptr, int *y_ptr, 753 int *w_ptr, int *h_ptr) 754 { 755 int cx, cy; 756 757 /* Try to extend the area upwards. */ 758 for ( cy = *y_ptr - 1; 759 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 760 cy-- ); 761 *h_ptr += *y_ptr - (cy + 1); 762 *y_ptr = cy + 1; 763 764 /* ... downwards. */ 765 for ( cy = *y_ptr + *h_ptr; 766 cy < y + h && 767 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 768 cy++ ); 769 *h_ptr += cy - (*y_ptr + *h_ptr); 770 771 /* ... to the left. */ 772 for ( cx = *x_ptr - 1; 773 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 774 cx-- ); 775 *w_ptr += *x_ptr - (cx + 1); 776 *x_ptr = cx + 1; 777 778 /* ... to the right. */ 779 for ( cx = *x_ptr + *w_ptr; 780 cx < x + w && 781 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 782 cx++ ); 783 *w_ptr += cx - (*x_ptr + *w_ptr); 784 } 785 786 static int tight_init_stream(VncState *vs, int stream_id, 787 int level, int strategy) 788 { 789 z_streamp zstream = &vs->tight.stream[stream_id]; 790 791 if (zstream->opaque == NULL) { 792 int err; 793 794 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 795 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 796 zstream->zalloc = vnc_zlib_zalloc; 797 zstream->zfree = vnc_zlib_zfree; 798 799 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 800 MAX_MEM_LEVEL, strategy); 801 802 if (err != Z_OK) { 803 fprintf(stderr, "VNC: error initializing zlib\n"); 804 return -1; 805 } 806 807 vs->tight.levels[stream_id] = level; 808 zstream->opaque = vs; 809 } 810 811 if (vs->tight.levels[stream_id] != level) { 812 if (deflateParams(zstream, level, strategy) != Z_OK) { 813 return -1; 814 } 815 vs->tight.levels[stream_id] = level; 816 } 817 return 0; 818 } 819 820 static void tight_send_compact_size(VncState *vs, size_t len) 821 { 822 int lpc = 0; 823 int bytes = 0; 824 char buf[3] = {0, 0, 0}; 825 826 buf[bytes++] = len & 0x7F; 827 if (len > 0x7F) { 828 buf[bytes-1] |= 0x80; 829 buf[bytes++] = (len >> 7) & 0x7F; 830 if (len > 0x3FFF) { 831 buf[bytes-1] |= 0x80; 832 buf[bytes++] = (len >> 14) & 0xFF; 833 } 834 } 835 for (lpc = 0; lpc < bytes; lpc++) { 836 vnc_write_u8(vs, buf[lpc]); 837 } 838 } 839 840 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 841 int level, int strategy) 842 { 843 z_streamp zstream = &vs->tight.stream[stream_id]; 844 int previous_out; 845 846 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 847 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 848 return bytes; 849 } 850 851 if (tight_init_stream(vs, stream_id, level, strategy)) { 852 return -1; 853 } 854 855 /* reserve memory in output buffer */ 856 buffer_reserve(&vs->tight.zlib, bytes + 64); 857 858 /* set pointers */ 859 zstream->next_in = vs->tight.tight.buffer; 860 zstream->avail_in = vs->tight.tight.offset; 861 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 862 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 863 previous_out = zstream->avail_out; 864 zstream->data_type = Z_BINARY; 865 866 /* start encoding */ 867 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 868 fprintf(stderr, "VNC: error during tight compression\n"); 869 return -1; 870 } 871 872 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 873 /* ...how much data has actually been produced by deflate() */ 874 bytes = previous_out - zstream->avail_out; 875 876 tight_send_compact_size(vs, bytes); 877 vnc_write(vs, vs->tight.zlib.buffer, bytes); 878 879 buffer_reset(&vs->tight.zlib); 880 881 return bytes; 882 } 883 884 /* 885 * Subencoding implementations. 886 */ 887 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 888 { 889 uint8_t *buf8; 890 uint32_t pix; 891 int rshift, gshift, bshift; 892 893 buf8 = buf; 894 895 if (1 /* FIXME */) { 896 rshift = vs->client_pf.rshift; 897 gshift = vs->client_pf.gshift; 898 bshift = vs->client_pf.bshift; 899 } else { 900 rshift = 24 - vs->client_pf.rshift; 901 gshift = 24 - vs->client_pf.gshift; 902 bshift = 24 - vs->client_pf.bshift; 903 } 904 905 if (ret) { 906 *ret = count * 3; 907 } 908 909 while (count--) { 910 pix = ldl_he_p(buf8); 911 *buf++ = (char)(pix >> rshift); 912 *buf++ = (char)(pix >> gshift); 913 *buf++ = (char)(pix >> bshift); 914 buf8 += 4; 915 } 916 } 917 918 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h) 919 { 920 int stream = 0; 921 ssize_t bytes; 922 923 #ifdef CONFIG_VNC_PNG 924 if (tight_can_send_png_rect(vs, w, h)) { 925 return send_png_rect(vs, x, y, w, h, NULL); 926 } 927 #endif 928 929 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 930 931 if (vs->tight.pixel24) { 932 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset); 933 bytes = 3; 934 } else { 935 bytes = vs->client_pf.bytes_per_pixel; 936 } 937 938 bytes = tight_compress_data(vs, stream, w * h * bytes, 939 tight_conf[vs->tight.compression].raw_zlib_level, 940 Z_DEFAULT_STRATEGY); 941 942 return (bytes >= 0); 943 } 944 945 static int send_solid_rect(VncState *vs) 946 { 947 size_t bytes; 948 949 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 950 951 if (vs->tight.pixel24) { 952 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset); 953 bytes = 3; 954 } else { 955 bytes = vs->client_pf.bytes_per_pixel; 956 } 957 958 vnc_write(vs, vs->tight.tight.buffer, bytes); 959 return 1; 960 } 961 962 static int send_mono_rect(VncState *vs, int x, int y, 963 int w, int h, uint32_t bg, uint32_t fg) 964 { 965 ssize_t bytes; 966 int stream = 1; 967 int level = tight_conf[vs->tight.compression].mono_zlib_level; 968 969 #ifdef CONFIG_VNC_PNG 970 if (tight_can_send_png_rect(vs, w, h)) { 971 int ret; 972 int bpp = vs->client_pf.bytes_per_pixel * 8; 973 VncPalette *palette = palette_new(2, bpp); 974 975 palette_put(palette, bg); 976 palette_put(palette, fg); 977 ret = send_png_rect(vs, x, y, w, h, palette); 978 palette_destroy(palette); 979 return ret; 980 } 981 #endif 982 983 bytes = DIV_ROUND_UP(w, 8) * h; 984 985 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 986 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 987 vnc_write_u8(vs, 1); 988 989 switch (vs->client_pf.bytes_per_pixel) { 990 case 4: 991 { 992 uint32_t buf[2] = {bg, fg}; 993 size_t ret = sizeof (buf); 994 995 if (vs->tight.pixel24) { 996 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 997 } 998 vnc_write(vs, buf, ret); 999 1000 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg); 1001 break; 1002 } 1003 case 2: 1004 vnc_write(vs, &bg, 2); 1005 vnc_write(vs, &fg, 2); 1006 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg); 1007 break; 1008 default: 1009 vnc_write_u8(vs, bg); 1010 vnc_write_u8(vs, fg); 1011 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg); 1012 break; 1013 } 1014 vs->tight.tight.offset = bytes; 1015 1016 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); 1017 return (bytes >= 0); 1018 } 1019 1020 struct palette_cb_priv { 1021 VncState *vs; 1022 uint8_t *header; 1023 #ifdef CONFIG_VNC_PNG 1024 png_colorp png_palette; 1025 #endif 1026 }; 1027 1028 static void write_palette(int idx, uint32_t color, void *opaque) 1029 { 1030 struct palette_cb_priv *priv = opaque; 1031 VncState *vs = priv->vs; 1032 uint32_t bytes = vs->client_pf.bytes_per_pixel; 1033 1034 if (bytes == 4) { 1035 ((uint32_t*)priv->header)[idx] = color; 1036 } else { 1037 ((uint16_t*)priv->header)[idx] = color; 1038 } 1039 } 1040 1041 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h) 1042 { 1043 int stream = 3; 1044 int level = tight_conf[vs->tight.compression].gradient_zlib_level; 1045 ssize_t bytes; 1046 1047 if (vs->client_pf.bytes_per_pixel == 1) { 1048 return send_full_color_rect(vs, x, y, w, h); 1049 } 1050 1051 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1052 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1053 1054 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int)); 1055 1056 if (vs->tight.pixel24) { 1057 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h); 1058 bytes = 3; 1059 } else if (vs->client_pf.bytes_per_pixel == 4) { 1060 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h); 1061 bytes = 4; 1062 } else { 1063 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h); 1064 bytes = 2; 1065 } 1066 1067 buffer_reset(&vs->tight.gradient); 1068 1069 bytes = w * h * bytes; 1070 vs->tight.tight.offset = bytes; 1071 1072 bytes = tight_compress_data(vs, stream, bytes, 1073 level, Z_FILTERED); 1074 return (bytes >= 0); 1075 } 1076 1077 static int send_palette_rect(VncState *vs, int x, int y, 1078 int w, int h, VncPalette *palette) 1079 { 1080 int stream = 2; 1081 int level = tight_conf[vs->tight.compression].idx_zlib_level; 1082 int colors; 1083 ssize_t bytes; 1084 1085 #ifdef CONFIG_VNC_PNG 1086 if (tight_can_send_png_rect(vs, w, h)) { 1087 return send_png_rect(vs, x, y, w, h, palette); 1088 } 1089 #endif 1090 1091 colors = palette_size(palette); 1092 1093 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1094 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1095 vnc_write_u8(vs, colors - 1); 1096 1097 switch (vs->client_pf.bytes_per_pixel) { 1098 case 4: 1099 { 1100 size_t old_offset, offset; 1101 uint32_t header[palette_size(palette)]; 1102 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1103 1104 old_offset = vs->output.offset; 1105 palette_iter(palette, write_palette, &priv); 1106 vnc_write(vs, header, sizeof(header)); 1107 1108 if (vs->tight.pixel24) { 1109 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1110 vs->output.offset = old_offset + offset; 1111 } 1112 1113 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1114 break; 1115 } 1116 case 2: 1117 { 1118 uint16_t header[palette_size(palette)]; 1119 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1120 1121 palette_iter(palette, write_palette, &priv); 1122 vnc_write(vs, header, sizeof(header)); 1123 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1124 break; 1125 } 1126 default: 1127 return -1; /* No palette for 8bits colors */ 1128 break; 1129 } 1130 bytes = w * h; 1131 vs->tight.tight.offset = bytes; 1132 1133 bytes = tight_compress_data(vs, stream, bytes, 1134 level, Z_DEFAULT_STRATEGY); 1135 return (bytes >= 0); 1136 } 1137 1138 /* 1139 * JPEG compression stuff. 1140 */ 1141 #ifdef CONFIG_VNC_JPEG 1142 /* 1143 * Destination manager implementation for JPEG library. 1144 */ 1145 1146 /* This is called once per encoding */ 1147 static void jpeg_init_destination(j_compress_ptr cinfo) 1148 { 1149 VncState *vs = cinfo->client_data; 1150 Buffer *buffer = &vs->tight.jpeg; 1151 1152 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1153 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1154 } 1155 1156 /* This is called when we ran out of buffer (shouldn't happen!) */ 1157 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1158 { 1159 VncState *vs = cinfo->client_data; 1160 Buffer *buffer = &vs->tight.jpeg; 1161 1162 buffer->offset = buffer->capacity; 1163 buffer_reserve(buffer, 2048); 1164 jpeg_init_destination(cinfo); 1165 return TRUE; 1166 } 1167 1168 /* This is called when we are done processing data */ 1169 static void jpeg_term_destination(j_compress_ptr cinfo) 1170 { 1171 VncState *vs = cinfo->client_data; 1172 Buffer *buffer = &vs->tight.jpeg; 1173 1174 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1175 } 1176 1177 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) 1178 { 1179 struct jpeg_compress_struct cinfo; 1180 struct jpeg_error_mgr jerr; 1181 struct jpeg_destination_mgr manager; 1182 pixman_image_t *linebuf; 1183 JSAMPROW row[1]; 1184 uint8_t *buf; 1185 int dy; 1186 1187 if (surface_bytes_per_pixel(vs->vd->ds) == 1) { 1188 return send_full_color_rect(vs, x, y, w, h); 1189 } 1190 1191 buffer_reserve(&vs->tight.jpeg, 2048); 1192 1193 cinfo.err = jpeg_std_error(&jerr); 1194 jpeg_create_compress(&cinfo); 1195 1196 cinfo.client_data = vs; 1197 cinfo.image_width = w; 1198 cinfo.image_height = h; 1199 cinfo.input_components = 3; 1200 cinfo.in_color_space = JCS_RGB; 1201 1202 jpeg_set_defaults(&cinfo); 1203 jpeg_set_quality(&cinfo, quality, true); 1204 1205 manager.init_destination = jpeg_init_destination; 1206 manager.empty_output_buffer = jpeg_empty_output_buffer; 1207 manager.term_destination = jpeg_term_destination; 1208 cinfo.dest = &manager; 1209 1210 jpeg_start_compress(&cinfo, true); 1211 1212 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1213 buf = (uint8_t *)pixman_image_get_data(linebuf); 1214 row[0] = buf; 1215 for (dy = 0; dy < h; dy++) { 1216 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1217 jpeg_write_scanlines(&cinfo, row, 1); 1218 } 1219 qemu_pixman_image_unref(linebuf); 1220 1221 jpeg_finish_compress(&cinfo); 1222 jpeg_destroy_compress(&cinfo); 1223 1224 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1225 1226 tight_send_compact_size(vs, vs->tight.jpeg.offset); 1227 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset); 1228 buffer_reset(&vs->tight.jpeg); 1229 1230 return 1; 1231 } 1232 #endif /* CONFIG_VNC_JPEG */ 1233 1234 /* 1235 * PNG compression stuff. 1236 */ 1237 #ifdef CONFIG_VNC_PNG 1238 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1239 { 1240 struct palette_cb_priv *priv = opaque; 1241 VncState *vs = priv->vs; 1242 png_colorp color = &priv->png_palette[idx]; 1243 1244 if (vs->tight.pixel24) 1245 { 1246 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1247 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1248 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1249 } 1250 else 1251 { 1252 int red, green, blue; 1253 1254 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1255 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1256 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1257 color->red = ((red * 255 + vs->client_pf.rmax / 2) / 1258 vs->client_pf.rmax); 1259 color->green = ((green * 255 + vs->client_pf.gmax / 2) / 1260 vs->client_pf.gmax); 1261 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) / 1262 vs->client_pf.bmax); 1263 } 1264 } 1265 1266 static void png_write_data(png_structp png_ptr, png_bytep data, 1267 png_size_t length) 1268 { 1269 VncState *vs = png_get_io_ptr(png_ptr); 1270 1271 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length); 1272 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length); 1273 1274 vs->tight.png.offset += length; 1275 } 1276 1277 static void png_flush_data(png_structp png_ptr) 1278 { 1279 } 1280 1281 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1282 { 1283 return g_malloc(size); 1284 } 1285 1286 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1287 { 1288 g_free(ptr); 1289 } 1290 1291 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 1292 VncPalette *palette) 1293 { 1294 png_byte color_type; 1295 png_structp png_ptr; 1296 png_infop info_ptr; 1297 png_colorp png_palette = NULL; 1298 pixman_image_t *linebuf; 1299 int level = tight_png_conf[vs->tight.compression].png_zlib_level; 1300 int filters = tight_png_conf[vs->tight.compression].png_filters; 1301 uint8_t *buf; 1302 int dy; 1303 1304 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1305 NULL, vnc_png_malloc, vnc_png_free); 1306 1307 if (png_ptr == NULL) 1308 return -1; 1309 1310 info_ptr = png_create_info_struct(png_ptr); 1311 1312 if (info_ptr == NULL) { 1313 png_destroy_write_struct(&png_ptr, NULL); 1314 return -1; 1315 } 1316 1317 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data); 1318 png_set_compression_level(png_ptr, level); 1319 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1320 1321 if (palette) { 1322 color_type = PNG_COLOR_TYPE_PALETTE; 1323 } else { 1324 color_type = PNG_COLOR_TYPE_RGB; 1325 } 1326 1327 png_set_IHDR(png_ptr, info_ptr, w, h, 1328 8, color_type, PNG_INTERLACE_NONE, 1329 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1330 1331 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1332 struct palette_cb_priv priv; 1333 1334 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1335 palette_size(palette)); 1336 1337 priv.vs = vs; 1338 priv.png_palette = png_palette; 1339 palette_iter(palette, write_png_palette, &priv); 1340 1341 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1342 1343 if (vs->client_pf.bytes_per_pixel == 4) { 1344 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1345 } else { 1346 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1347 } 1348 } 1349 1350 png_write_info(png_ptr, info_ptr); 1351 1352 buffer_reserve(&vs->tight.png, 2048); 1353 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1354 buf = (uint8_t *)pixman_image_get_data(linebuf); 1355 for (dy = 0; dy < h; dy++) 1356 { 1357 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1358 memcpy(buf, vs->tight.tight.buffer + (dy * w), w); 1359 } else { 1360 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1361 } 1362 png_write_row(png_ptr, buf); 1363 } 1364 qemu_pixman_image_unref(linebuf); 1365 1366 png_write_end(png_ptr, NULL); 1367 1368 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1369 png_free(png_ptr, png_palette); 1370 } 1371 1372 png_destroy_write_struct(&png_ptr, &info_ptr); 1373 1374 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1375 1376 tight_send_compact_size(vs, vs->tight.png.offset); 1377 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset); 1378 buffer_reset(&vs->tight.png); 1379 return 1; 1380 } 1381 #endif /* CONFIG_VNC_PNG */ 1382 1383 static void vnc_tight_start(VncState *vs) 1384 { 1385 buffer_reset(&vs->tight.tight); 1386 1387 // make the output buffer be the zlib buffer, so we can compress it later 1388 vs->tight.tmp = vs->output; 1389 vs->output = vs->tight.tight; 1390 } 1391 1392 static void vnc_tight_stop(VncState *vs) 1393 { 1394 // switch back to normal output/zlib buffers 1395 vs->tight.tight = vs->output; 1396 vs->output = vs->tight.tmp; 1397 } 1398 1399 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h, 1400 int bg, int fg, int colors, VncPalette *palette) 1401 { 1402 int ret; 1403 1404 if (colors == 0) { 1405 if (tight_detect_smooth_image(vs, w, h)) { 1406 ret = send_gradient_rect(vs, x, y, w, h); 1407 } else { 1408 ret = send_full_color_rect(vs, x, y, w, h); 1409 } 1410 } else if (colors == 1) { 1411 ret = send_solid_rect(vs); 1412 } else if (colors == 2) { 1413 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1414 } else if (colors <= 256) { 1415 ret = send_palette_rect(vs, x, y, w, h, palette); 1416 } else { 1417 ret = 0; 1418 } 1419 return ret; 1420 } 1421 1422 #ifdef CONFIG_VNC_JPEG 1423 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h, 1424 int bg, int fg, int colors, 1425 VncPalette *palette, bool force) 1426 { 1427 int ret; 1428 1429 if (colors == 0) { 1430 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full && 1431 tight_detect_smooth_image(vs, w, h))) { 1432 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1433 1434 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1435 } else { 1436 ret = send_full_color_rect(vs, x, y, w, h); 1437 } 1438 } else if (colors == 1) { 1439 ret = send_solid_rect(vs); 1440 } else if (colors == 2) { 1441 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1442 } else if (colors <= 256) { 1443 if (force || (colors > 96 && 1444 tight_jpeg_conf[vs->tight.quality].jpeg_idx && 1445 tight_detect_smooth_image(vs, w, h))) { 1446 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1447 1448 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1449 } else { 1450 ret = send_palette_rect(vs, x, y, w, h, palette); 1451 } 1452 } else { 1453 ret = 0; 1454 } 1455 return ret; 1456 } 1457 #endif 1458 1459 static __thread VncPalette *color_count_palette; 1460 static __thread Notifier vnc_tight_cleanup_notifier; 1461 1462 static void vnc_tight_cleanup(Notifier *n, void *value) 1463 { 1464 g_free(color_count_palette); 1465 color_count_palette = NULL; 1466 } 1467 1468 static int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1469 { 1470 uint32_t bg = 0, fg = 0; 1471 int colors; 1472 int ret = 0; 1473 #ifdef CONFIG_VNC_JPEG 1474 bool force_jpeg = false; 1475 bool allow_jpeg = true; 1476 #endif 1477 1478 if (!color_count_palette) { 1479 color_count_palette = g_malloc(sizeof(VncPalette)); 1480 vnc_tight_cleanup_notifier.notify = vnc_tight_cleanup; 1481 qemu_thread_atexit_add(&vnc_tight_cleanup_notifier); 1482 } 1483 1484 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1485 1486 vnc_tight_start(vs); 1487 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1488 vnc_tight_stop(vs); 1489 1490 #ifdef CONFIG_VNC_JPEG 1491 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) { 1492 double freq = vnc_update_freq(vs, x, y, w, h); 1493 1494 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) { 1495 allow_jpeg = false; 1496 } 1497 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1498 force_jpeg = true; 1499 vnc_sent_lossy_rect(vs, x, y, w, h); 1500 } 1501 } 1502 #endif 1503 1504 colors = tight_fill_palette(vs, x, y, w * h, &bg, &fg, color_count_palette); 1505 1506 #ifdef CONFIG_VNC_JPEG 1507 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) { 1508 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, 1509 color_count_palette, force_jpeg); 1510 } else { 1511 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, 1512 color_count_palette); 1513 } 1514 #else 1515 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, 1516 color_count_palette); 1517 #endif 1518 1519 return ret; 1520 } 1521 1522 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1523 { 1524 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1525 1526 vnc_tight_start(vs); 1527 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1528 vnc_tight_stop(vs); 1529 1530 return send_solid_rect(vs); 1531 } 1532 1533 static int send_rect_simple(VncState *vs, int x, int y, int w, int h, 1534 bool split) 1535 { 1536 int max_size, max_width; 1537 int max_sub_width, max_sub_height; 1538 int dx, dy; 1539 int rw, rh; 1540 int n = 0; 1541 1542 max_size = tight_conf[vs->tight.compression].max_rect_size; 1543 max_width = tight_conf[vs->tight.compression].max_rect_width; 1544 1545 if (split && (w > max_width || w * h > max_size)) { 1546 max_sub_width = (w > max_width) ? max_width : w; 1547 max_sub_height = max_size / max_sub_width; 1548 1549 for (dy = 0; dy < h; dy += max_sub_height) { 1550 for (dx = 0; dx < w; dx += max_width) { 1551 rw = MIN(max_sub_width, w - dx); 1552 rh = MIN(max_sub_height, h - dy); 1553 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1554 } 1555 } 1556 } else { 1557 n += send_sub_rect(vs, x, y, w, h); 1558 } 1559 1560 return n; 1561 } 1562 1563 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1564 int w, int h, int max_rows) 1565 { 1566 int dx, dy, dw, dh; 1567 int n = 0; 1568 1569 /* Try to find large solid-color areas and send them separately. */ 1570 1571 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1572 1573 /* If a rectangle becomes too large, send its upper part now. */ 1574 1575 if (dy - y >= max_rows) { 1576 n += send_rect_simple(vs, x, y, w, max_rows, true); 1577 y += max_rows; 1578 h -= max_rows; 1579 } 1580 1581 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1582 1583 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1584 uint32_t color_value; 1585 int x_best, y_best, w_best, h_best; 1586 1587 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1588 1589 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1590 continue ; 1591 } 1592 1593 /* Get dimensions of solid-color area. */ 1594 1595 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1596 color_value, &w_best, &h_best); 1597 1598 /* Make sure a solid rectangle is large enough 1599 (or the whole rectangle is of the same color). */ 1600 1601 if (w_best * h_best != w * h && 1602 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1603 continue; 1604 } 1605 1606 /* Try to extend solid rectangle to maximum size. */ 1607 1608 x_best = dx; y_best = dy; 1609 extend_solid_area(vs, x, y, w, h, color_value, 1610 &x_best, &y_best, &w_best, &h_best); 1611 1612 /* Send rectangles at top and left to solid-color area. */ 1613 1614 if (y_best != y) { 1615 n += send_rect_simple(vs, x, y, w, y_best-y, true); 1616 } 1617 if (x_best != x) { 1618 n += tight_send_framebuffer_update(vs, x, y_best, 1619 x_best-x, h_best); 1620 } 1621 1622 /* Send solid-color rectangle. */ 1623 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1624 1625 /* Send remaining rectangles (at right and bottom). */ 1626 1627 if (x_best + w_best != x + w) { 1628 n += tight_send_framebuffer_update(vs, x_best+w_best, 1629 y_best, 1630 w-(x_best-x)-w_best, 1631 h_best); 1632 } 1633 if (y_best + h_best != y + h) { 1634 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1635 w, h-(y_best-y)-h_best); 1636 } 1637 1638 /* Return after all recursive calls are done. */ 1639 return n; 1640 } 1641 } 1642 return n + send_rect_simple(vs, x, y, w, h, true); 1643 } 1644 1645 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1646 int w, int h) 1647 { 1648 int max_rows; 1649 1650 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF && 1651 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) { 1652 vs->tight.pixel24 = true; 1653 } else { 1654 vs->tight.pixel24 = false; 1655 } 1656 1657 #ifdef CONFIG_VNC_JPEG 1658 if (vs->tight.quality != (uint8_t)-1) { 1659 double freq = vnc_update_freq(vs, x, y, w, h); 1660 1661 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1662 return send_rect_simple(vs, x, y, w, h, false); 1663 } 1664 } 1665 #endif 1666 1667 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1668 return send_rect_simple(vs, x, y, w, h, true); 1669 } 1670 1671 /* Calculate maximum number of rows in one non-solid rectangle. */ 1672 1673 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1674 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1675 1676 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1677 } 1678 1679 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1680 int w, int h) 1681 { 1682 vs->tight.type = VNC_ENCODING_TIGHT; 1683 return tight_send_framebuffer_update(vs, x, y, w, h); 1684 } 1685 1686 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1687 int w, int h) 1688 { 1689 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1690 return tight_send_framebuffer_update(vs, x, y, w, h); 1691 } 1692 1693 void vnc_tight_clear(VncState *vs) 1694 { 1695 int i; 1696 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1697 if (vs->tight.stream[i].opaque) { 1698 deflateEnd(&vs->tight.stream[i]); 1699 } 1700 } 1701 1702 buffer_free(&vs->tight.tight); 1703 buffer_free(&vs->tight.zlib); 1704 buffer_free(&vs->tight.gradient); 1705 #ifdef CONFIG_VNC_JPEG 1706 buffer_free(&vs->tight.jpeg); 1707 #endif 1708 #ifdef CONFIG_VNC_PNG 1709 buffer_free(&vs->tight.png); 1710 #endif 1711 } 1712