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_init(palette, 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; ) { \ 465 \ 466 rgb = *src++; \ 467 i++; \ 468 rep = 0; \ 469 while (i < count && *src == rgb) { \ 470 rep++, src++, i++; \ 471 } \ 472 idx = palette_idx(palette, rgb); \ 473 /* \ 474 * Should never happen, but don't break everything \ 475 * if it does, use the first color instead \ 476 */ \ 477 if (idx == (uint8_t)-1) { \ 478 idx = 0; \ 479 } \ 480 while (rep >= 0) { \ 481 *buf++ = idx; \ 482 rep--; \ 483 } \ 484 } \ 485 } 486 487 DEFINE_IDX_ENCODE_FUNCTION(16) 488 DEFINE_IDX_ENCODE_FUNCTION(32) 489 490 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 491 \ 492 static void \ 493 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 494 uint##bpp##_t bg, uint##bpp##_t fg) { \ 495 uint##bpp##_t *ptr; \ 496 unsigned int value, mask; \ 497 int aligned_width; \ 498 int x, y, bg_bits; \ 499 \ 500 ptr = (uint##bpp##_t *) buf; \ 501 aligned_width = w - w % 8; \ 502 \ 503 for (y = 0; y < h; y++) { \ 504 for (x = 0; x < aligned_width; x += 8) { \ 505 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 506 if (*ptr++ != bg) { \ 507 break; \ 508 } \ 509 } \ 510 if (bg_bits == 8) { \ 511 *buf++ = 0; \ 512 continue; \ 513 } \ 514 mask = 0x80 >> bg_bits; \ 515 value = mask; \ 516 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 517 mask >>= 1; \ 518 if (*ptr++ != bg) { \ 519 value |= mask; \ 520 } \ 521 } \ 522 *buf++ = (uint8_t)value; \ 523 } \ 524 \ 525 mask = 0x80; \ 526 value = 0; \ 527 if (x >= w) { \ 528 continue; \ 529 } \ 530 \ 531 for (; x < w; x++) { \ 532 if (*ptr++ != bg) { \ 533 value |= mask; \ 534 } \ 535 mask >>= 1; \ 536 } \ 537 *buf++ = (uint8_t)value; \ 538 } \ 539 } 540 541 DEFINE_MONO_ENCODE_FUNCTION(8) 542 DEFINE_MONO_ENCODE_FUNCTION(16) 543 DEFINE_MONO_ENCODE_FUNCTION(32) 544 545 /* 546 * ``Gradient'' filter for 24-bit color samples. 547 * Should be called only when redMax, greenMax and blueMax are 255. 548 * Color components assumed to be byte-aligned. 549 */ 550 551 static void 552 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 553 { 554 uint32_t *buf32; 555 uint32_t pix32; 556 int shift[3]; 557 int *prev; 558 int here[3], upper[3], left[3], upperleft[3]; 559 int prediction; 560 int x, y, c; 561 562 buf32 = (uint32_t *)buf; 563 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 564 565 if (1 /* FIXME */) { 566 shift[0] = vs->client_pf.rshift; 567 shift[1] = vs->client_pf.gshift; 568 shift[2] = vs->client_pf.bshift; 569 } else { 570 shift[0] = 24 - vs->client_pf.rshift; 571 shift[1] = 24 - vs->client_pf.gshift; 572 shift[2] = 24 - vs->client_pf.bshift; 573 } 574 575 for (y = 0; y < h; y++) { 576 for (c = 0; c < 3; c++) { 577 upper[c] = 0; 578 here[c] = 0; 579 } 580 prev = (int *)vs->tight.gradient.buffer; 581 for (x = 0; x < w; x++) { 582 pix32 = *buf32++; 583 for (c = 0; c < 3; c++) { 584 upperleft[c] = upper[c]; 585 left[c] = here[c]; 586 upper[c] = *prev; 587 here[c] = (int)(pix32 >> shift[c] & 0xFF); 588 *prev++ = here[c]; 589 590 prediction = left[c] + upper[c] - upperleft[c]; 591 if (prediction < 0) { 592 prediction = 0; 593 } else if (prediction > 0xFF) { 594 prediction = 0xFF; 595 } 596 *buf++ = (char)(here[c] - prediction); 597 } 598 } 599 } 600 } 601 602 603 /* 604 * ``Gradient'' filter for other color depths. 605 */ 606 607 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 608 \ 609 static void \ 610 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 611 int w, int h) { \ 612 uint##bpp##_t pix, diff; \ 613 bool endian; \ 614 int *prev; \ 615 int max[3], shift[3]; \ 616 int here[3], upper[3], left[3], upperleft[3]; \ 617 int prediction; \ 618 int x, y, c; \ 619 \ 620 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 621 \ 622 endian = 0; /* FIXME */ \ 623 \ 624 max[0] = vs->client_pf.rmax; \ 625 max[1] = vs->client_pf.gmax; \ 626 max[2] = vs->client_pf.bmax; \ 627 shift[0] = vs->client_pf.rshift; \ 628 shift[1] = vs->client_pf.gshift; \ 629 shift[2] = vs->client_pf.bshift; \ 630 \ 631 for (y = 0; y < h; y++) { \ 632 for (c = 0; c < 3; c++) { \ 633 upper[c] = 0; \ 634 here[c] = 0; \ 635 } \ 636 prev = (int *)vs->tight.gradient.buffer; \ 637 for (x = 0; x < w; x++) { \ 638 pix = *buf; \ 639 if (endian) { \ 640 pix = bswap##bpp(pix); \ 641 } \ 642 diff = 0; \ 643 for (c = 0; c < 3; c++) { \ 644 upperleft[c] = upper[c]; \ 645 left[c] = here[c]; \ 646 upper[c] = *prev; \ 647 here[c] = (int)(pix >> shift[c] & max[c]); \ 648 *prev++ = here[c]; \ 649 \ 650 prediction = left[c] + upper[c] - upperleft[c]; \ 651 if (prediction < 0) { \ 652 prediction = 0; \ 653 } else if (prediction > max[c]) { \ 654 prediction = max[c]; \ 655 } \ 656 diff |= ((here[c] - prediction) & max[c]) \ 657 << shift[c]; \ 658 } \ 659 if (endian) { \ 660 diff = bswap##bpp(diff); \ 661 } \ 662 *buf++ = diff; \ 663 } \ 664 } \ 665 } 666 667 DEFINE_GRADIENT_FILTER_FUNCTION(16) 668 DEFINE_GRADIENT_FILTER_FUNCTION(32) 669 670 /* 671 * Check if a rectangle is all of the same color. If needSameColor is 672 * set to non-zero, then also check that its color equals to the 673 * *colorPtr value. The result is 1 if the test is successful, and in 674 * that case new color will be stored in *colorPtr. 675 */ 676 677 static bool 678 check_solid_tile32(VncState *vs, int x, int y, int w, int h, 679 uint32_t *color, bool samecolor) 680 { 681 VncDisplay *vd = vs->vd; 682 uint32_t *fbptr; 683 uint32_t c; 684 int dx, dy; 685 686 fbptr = vnc_server_fb_ptr(vd, x, y); 687 688 c = *fbptr; 689 if (samecolor && (uint32_t)c != *color) { 690 return false; 691 } 692 693 for (dy = 0; dy < h; dy++) { 694 for (dx = 0; dx < w; dx++) { 695 if (c != fbptr[dx]) { 696 return false; 697 } 698 } 699 fbptr = (uint32_t *) 700 ((uint8_t *)fbptr + vnc_server_fb_stride(vd)); 701 } 702 703 *color = (uint32_t)c; 704 return true; 705 } 706 707 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 708 uint32_t* color, bool samecolor) 709 { 710 QEMU_BUILD_BUG_ON(VNC_SERVER_FB_BYTES != 4); 711 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 712 } 713 714 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 715 uint32_t color, int *w_ptr, int *h_ptr) 716 { 717 int dx, dy, dw, dh; 718 int w_prev; 719 int w_best = 0, h_best = 0; 720 721 w_prev = w; 722 723 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 724 725 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 726 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 727 728 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 729 break; 730 } 731 732 for (dx = x + dw; dx < x + w_prev;) { 733 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 734 735 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 736 break; 737 } 738 dx += dw; 739 } 740 741 w_prev = dx - x; 742 if (w_prev * (dy + dh - y) > w_best * h_best) { 743 w_best = w_prev; 744 h_best = dy + dh - y; 745 } 746 } 747 748 *w_ptr = w_best; 749 *h_ptr = h_best; 750 } 751 752 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 753 uint32_t color, int *x_ptr, int *y_ptr, 754 int *w_ptr, int *h_ptr) 755 { 756 int cx, cy; 757 758 /* Try to extend the area upwards. */ 759 for ( cy = *y_ptr - 1; 760 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 761 cy-- ); 762 *h_ptr += *y_ptr - (cy + 1); 763 *y_ptr = cy + 1; 764 765 /* ... downwards. */ 766 for ( cy = *y_ptr + *h_ptr; 767 cy < y + h && 768 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 769 cy++ ); 770 *h_ptr += cy - (*y_ptr + *h_ptr); 771 772 /* ... to the left. */ 773 for ( cx = *x_ptr - 1; 774 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 775 cx-- ); 776 *w_ptr += *x_ptr - (cx + 1); 777 *x_ptr = cx + 1; 778 779 /* ... to the right. */ 780 for ( cx = *x_ptr + *w_ptr; 781 cx < x + w && 782 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 783 cx++ ); 784 *w_ptr += cx - (*x_ptr + *w_ptr); 785 } 786 787 static int tight_init_stream(VncState *vs, int stream_id, 788 int level, int strategy) 789 { 790 z_streamp zstream = &vs->tight.stream[stream_id]; 791 792 if (zstream->opaque == NULL) { 793 int err; 794 795 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 796 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 797 zstream->zalloc = vnc_zlib_zalloc; 798 zstream->zfree = vnc_zlib_zfree; 799 800 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 801 MAX_MEM_LEVEL, strategy); 802 803 if (err != Z_OK) { 804 fprintf(stderr, "VNC: error initializing zlib\n"); 805 return -1; 806 } 807 808 vs->tight.levels[stream_id] = level; 809 zstream->opaque = vs; 810 } 811 812 if (vs->tight.levels[stream_id] != level) { 813 if (deflateParams(zstream, level, strategy) != Z_OK) { 814 return -1; 815 } 816 vs->tight.levels[stream_id] = level; 817 } 818 return 0; 819 } 820 821 static void tight_send_compact_size(VncState *vs, size_t len) 822 { 823 int lpc = 0; 824 int bytes = 0; 825 char buf[3] = {0, 0, 0}; 826 827 buf[bytes++] = len & 0x7F; 828 if (len > 0x7F) { 829 buf[bytes-1] |= 0x80; 830 buf[bytes++] = (len >> 7) & 0x7F; 831 if (len > 0x3FFF) { 832 buf[bytes-1] |= 0x80; 833 buf[bytes++] = (len >> 14) & 0xFF; 834 } 835 } 836 for (lpc = 0; lpc < bytes; lpc++) { 837 vnc_write_u8(vs, buf[lpc]); 838 } 839 } 840 841 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 842 int level, int strategy) 843 { 844 z_streamp zstream = &vs->tight.stream[stream_id]; 845 int previous_out; 846 847 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 848 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 849 return bytes; 850 } 851 852 if (tight_init_stream(vs, stream_id, level, strategy)) { 853 return -1; 854 } 855 856 /* reserve memory in output buffer */ 857 buffer_reserve(&vs->tight.zlib, bytes + 64); 858 859 /* set pointers */ 860 zstream->next_in = vs->tight.tight.buffer; 861 zstream->avail_in = vs->tight.tight.offset; 862 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 863 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 864 previous_out = zstream->avail_out; 865 zstream->data_type = Z_BINARY; 866 867 /* start encoding */ 868 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 869 fprintf(stderr, "VNC: error during tight compression\n"); 870 return -1; 871 } 872 873 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 874 /* ...how much data has actually been produced by deflate() */ 875 bytes = previous_out - zstream->avail_out; 876 877 tight_send_compact_size(vs, bytes); 878 vnc_write(vs, vs->tight.zlib.buffer, bytes); 879 880 buffer_reset(&vs->tight.zlib); 881 882 return bytes; 883 } 884 885 /* 886 * Subencoding implementations. 887 */ 888 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 889 { 890 uint32_t *buf32; 891 uint32_t pix; 892 int rshift, gshift, bshift; 893 894 buf32 = (uint32_t *)buf; 895 896 if (1 /* FIXME */) { 897 rshift = vs->client_pf.rshift; 898 gshift = vs->client_pf.gshift; 899 bshift = vs->client_pf.bshift; 900 } else { 901 rshift = 24 - vs->client_pf.rshift; 902 gshift = 24 - vs->client_pf.gshift; 903 bshift = 24 - vs->client_pf.bshift; 904 } 905 906 if (ret) { 907 *ret = count * 3; 908 } 909 910 while (count--) { 911 pix = *buf32++; 912 *buf++ = (char)(pix >> rshift); 913 *buf++ = (char)(pix >> gshift); 914 *buf++ = (char)(pix >> bshift); 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 = ((w + 7) / 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