1 /* 2 * QEMU VNC display driver: tight encoding 3 * 4 * From libvncserver/libvncserver/tight.c 5 * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved. 6 * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. 7 * 8 * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com> 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a copy 11 * of this software and associated documentation files (the "Software"), to deal 12 * in the Software without restriction, including without limitation the rights 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 14 * copies of the Software, and to permit persons to whom the Software is 15 * furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be included in 18 * all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 26 * THE SOFTWARE. 27 */ 28 29 #include "config-host.h" 30 31 /* This needs to be before jpeglib.h line because of conflict with 32 INT32 definitions between jmorecfg.h (included by jpeglib.h) and 33 Win32 basetsd.h (included by windows.h). */ 34 #include "qemu-common.h" 35 36 #ifdef CONFIG_VNC_PNG 37 /* The following define is needed by pngconf.h. Otherwise it won't compile, 38 because setjmp.h was already included by qemu-common.h. */ 39 #define PNG_SKIP_SETJMP_CHECK 40 #include <png.h> 41 #endif 42 #ifdef CONFIG_VNC_JPEG 43 #include <stdio.h> 44 #include <jpeglib.h> 45 #endif 46 47 #include "qemu/bswap.h" 48 #include "qapi/qmp/qint.h" 49 #include "vnc.h" 50 #include "vnc-enc-tight.h" 51 #include "vnc-palette.h" 52 53 /* Compression level stuff. The following array contains various 54 encoder parameters for each of 10 compression levels (0..9). 55 Last three parameters correspond to JPEG quality levels (0..9). */ 56 57 static const struct { 58 int max_rect_size, max_rect_width; 59 int mono_min_rect_size, gradient_min_rect_size; 60 int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; 61 int gradient_threshold, gradient_threshold24; 62 int idx_max_colors_divisor; 63 int jpeg_quality, jpeg_threshold, jpeg_threshold24; 64 } tight_conf[] = { 65 { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, 66 { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, 67 { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, 68 { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, 69 { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, 70 { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, 71 { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, 72 { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, 73 { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, 74 { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } 75 }; 76 77 78 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 79 int w, int h); 80 81 #ifdef CONFIG_VNC_JPEG 82 static const struct { 83 double jpeg_freq_min; /* Don't send JPEG if the freq is bellow */ 84 double jpeg_freq_threshold; /* Always send JPEG if the freq is above */ 85 int jpeg_idx; /* Allow indexed JPEG */ 86 int jpeg_full; /* Allow full color JPEG */ 87 } tight_jpeg_conf[] = { 88 { 0, 8, 1, 1 }, 89 { 0, 8, 1, 1 }, 90 { 0, 8, 1, 1 }, 91 { 0, 8, 1, 1 }, 92 { 0, 10, 1, 1 }, 93 { 0.1, 10, 1, 1 }, 94 { 0.2, 10, 1, 1 }, 95 { 0.3, 12, 0, 0 }, 96 { 0.4, 14, 0, 0 }, 97 { 0.5, 16, 0, 0 }, 98 }; 99 #endif 100 101 #ifdef CONFIG_VNC_PNG 102 static const struct { 103 int png_zlib_level, png_filters; 104 } tight_png_conf[] = { 105 { 0, PNG_NO_FILTERS }, 106 { 1, PNG_NO_FILTERS }, 107 { 2, PNG_NO_FILTERS }, 108 { 3, PNG_NO_FILTERS }, 109 { 4, PNG_NO_FILTERS }, 110 { 5, PNG_ALL_FILTERS }, 111 { 6, PNG_ALL_FILTERS }, 112 { 7, PNG_ALL_FILTERS }, 113 { 8, PNG_ALL_FILTERS }, 114 { 9, PNG_ALL_FILTERS }, 115 }; 116 117 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 118 VncPalette *palette); 119 120 static bool tight_can_send_png_rect(VncState *vs, int w, int h) 121 { 122 if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) { 123 return false; 124 } 125 126 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 127 vs->client_pf.bytes_per_pixel == 1) { 128 return false; 129 } 130 131 return true; 132 } 133 #endif 134 135 /* 136 * Code to guess if given rectangle is suitable for smooth image 137 * compression (by applying "gradient" filter or JPEG coder). 138 */ 139 140 static unsigned int 141 tight_detect_smooth_image24(VncState *vs, int w, int h) 142 { 143 int off; 144 int x, y, d, dx; 145 unsigned int c; 146 unsigned int stats[256]; 147 int pixels = 0; 148 int pix, left[3]; 149 unsigned int errors; 150 unsigned char *buf = vs->tight.tight.buffer; 151 152 /* 153 * If client is big-endian, color samples begin from the second 154 * byte (offset 1) of a 32-bit pixel value. 155 */ 156 off = vs->client_be; 157 158 memset(stats, 0, sizeof (stats)); 159 160 for (y = 0, x = 0; y < h && x < w;) { 161 for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; 162 d++) { 163 for (c = 0; c < 3; c++) { 164 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF; 165 } 166 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) { 167 for (c = 0; c < 3; c++) { 168 pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF; 169 stats[abs(pix - left[c])]++; 170 left[c] = pix; 171 } 172 pixels++; 173 } 174 } 175 if (w > h) { 176 x += h; 177 y = 0; 178 } else { 179 x = 0; 180 y += w; 181 } 182 } 183 184 if (pixels == 0) { 185 return 0; 186 } 187 188 /* 95% smooth or more ... */ 189 if (stats[0] * 33 / pixels >= 95) { 190 return 0; 191 } 192 193 errors = 0; 194 for (c = 1; c < 8; c++) { 195 errors += stats[c] * (c * c); 196 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 197 return 0; 198 } 199 } 200 for (; c < 256; c++) { 201 errors += stats[c] * (c * c); 202 } 203 errors /= (pixels * 3 - stats[0]); 204 205 return errors; 206 } 207 208 #define DEFINE_DETECT_FUNCTION(bpp) \ 209 \ 210 static unsigned int \ 211 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 212 bool endian; \ 213 uint##bpp##_t pix; \ 214 int max[3], shift[3]; \ 215 int x, y, d, dx; \ 216 unsigned int c; \ 217 unsigned int stats[256]; \ 218 int pixels = 0; \ 219 int sample, sum, left[3]; \ 220 unsigned int errors; \ 221 unsigned char *buf = vs->tight.tight.buffer; \ 222 \ 223 endian = 0; /* FIXME: ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 224 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); */ \ 225 \ 226 \ 227 max[0] = vs->client_pf.rmax; \ 228 max[1] = vs->client_pf.gmax; \ 229 max[2] = vs->client_pf.bmax; \ 230 shift[0] = vs->client_pf.rshift; \ 231 shift[1] = vs->client_pf.gshift; \ 232 shift[2] = vs->client_pf.bshift; \ 233 \ 234 memset(stats, 0, sizeof(stats)); \ 235 \ 236 y = 0, x = 0; \ 237 while (y < h && x < w) { \ 238 for (d = 0; d < h - y && \ 239 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 240 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 241 if (endian) { \ 242 pix = bswap##bpp(pix); \ 243 } \ 244 for (c = 0; c < 3; c++) { \ 245 left[c] = (int)(pix >> shift[c] & max[c]); \ 246 } \ 247 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 248 dx++) { \ 249 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 250 if (endian) { \ 251 pix = bswap##bpp(pix); \ 252 } \ 253 sum = 0; \ 254 for (c = 0; c < 3; c++) { \ 255 sample = (int)(pix >> shift[c] & max[c]); \ 256 sum += abs(sample - left[c]); \ 257 left[c] = sample; \ 258 } \ 259 if (sum > 255) { \ 260 sum = 255; \ 261 } \ 262 stats[sum]++; \ 263 pixels++; \ 264 } \ 265 } \ 266 if (w > h) { \ 267 x += h; \ 268 y = 0; \ 269 } else { \ 270 x = 0; \ 271 y += w; \ 272 } \ 273 } \ 274 if (pixels == 0) { \ 275 return 0; \ 276 } \ 277 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 278 return 0; \ 279 } \ 280 \ 281 errors = 0; \ 282 for (c = 1; c < 8; c++) { \ 283 errors += stats[c] * (c * c); \ 284 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 285 return 0; \ 286 } \ 287 } \ 288 for (; c < 256; c++) { \ 289 errors += stats[c] * (c * c); \ 290 } \ 291 errors /= (pixels - stats[0]); \ 292 \ 293 return errors; \ 294 } 295 296 DEFINE_DETECT_FUNCTION(16) 297 DEFINE_DETECT_FUNCTION(32) 298 299 static int 300 tight_detect_smooth_image(VncState *vs, int w, int h) 301 { 302 unsigned int errors; 303 int compression = vs->tight.compression; 304 int quality = vs->tight.quality; 305 306 if (!vs->vd->lossy) { 307 return 0; 308 } 309 310 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 311 vs->client_pf.bytes_per_pixel == 1 || 312 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 313 return 0; 314 } 315 316 if (vs->tight.quality != (uint8_t)-1) { 317 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 318 return 0; 319 } 320 } else { 321 if (w * h < tight_conf[compression].gradient_min_rect_size) { 322 return 0; 323 } 324 } 325 326 if (vs->client_pf.bytes_per_pixel == 4) { 327 if (vs->tight.pixel24) { 328 errors = tight_detect_smooth_image24(vs, w, h); 329 if (vs->tight.quality != (uint8_t)-1) { 330 return (errors < tight_conf[quality].jpeg_threshold24); 331 } 332 return (errors < tight_conf[compression].gradient_threshold24); 333 } else { 334 errors = tight_detect_smooth_image32(vs, w, h); 335 } 336 } else { 337 errors = tight_detect_smooth_image16(vs, w, h); 338 } 339 if (quality != (uint8_t)-1) { 340 return (errors < tight_conf[quality].jpeg_threshold); 341 } 342 return (errors < tight_conf[compression].gradient_threshold); 343 } 344 345 /* 346 * Code to determine how many different colors used in rectangle. 347 */ 348 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 349 \ 350 static int \ 351 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 352 int max, size_t count, \ 353 uint32_t *bg, uint32_t *fg, \ 354 VncPalette **palette) { \ 355 uint##bpp##_t *data; \ 356 uint##bpp##_t c0, c1, ci; \ 357 int i, n0, n1; \ 358 \ 359 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 360 \ 361 c0 = data[0]; \ 362 i = 1; \ 363 while (i < count && data[i] == c0) \ 364 i++; \ 365 if (i >= count) { \ 366 *bg = *fg = c0; \ 367 return 1; \ 368 } \ 369 \ 370 if (max < 2) { \ 371 return 0; \ 372 } \ 373 \ 374 n0 = i; \ 375 c1 = data[i]; \ 376 n1 = 0; \ 377 for (i++; i < count; i++) { \ 378 ci = data[i]; \ 379 if (ci == c0) { \ 380 n0++; \ 381 } else if (ci == c1) { \ 382 n1++; \ 383 } else \ 384 break; \ 385 } \ 386 if (i >= count) { \ 387 if (n0 > n1) { \ 388 *bg = (uint32_t)c0; \ 389 *fg = (uint32_t)c1; \ 390 } else { \ 391 *bg = (uint32_t)c1; \ 392 *fg = (uint32_t)c0; \ 393 } \ 394 return 2; \ 395 } \ 396 \ 397 if (max == 2) { \ 398 return 0; \ 399 } \ 400 \ 401 *palette = palette_new(max, bpp); \ 402 palette_put(*palette, c0); \ 403 palette_put(*palette, c1); \ 404 palette_put(*palette, ci); \ 405 \ 406 for (i++; i < count; i++) { \ 407 if (data[i] == ci) { \ 408 continue; \ 409 } else { \ 410 ci = data[i]; \ 411 if (!palette_put(*palette, (uint32_t)ci)) { \ 412 return 0; \ 413 } \ 414 } \ 415 } \ 416 \ 417 return palette_size(*palette); \ 418 } 419 420 DEFINE_FILL_PALETTE_FUNCTION(8) 421 DEFINE_FILL_PALETTE_FUNCTION(16) 422 DEFINE_FILL_PALETTE_FUNCTION(32) 423 424 static int tight_fill_palette(VncState *vs, int x, int y, 425 size_t count, uint32_t *bg, uint32_t *fg, 426 VncPalette **palette) 427 { 428 int max; 429 430 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 431 if (max < 2 && 432 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 433 max = 2; 434 } 435 if (max >= 256) { 436 max = 256; 437 } 438 439 switch (vs->client_pf.bytes_per_pixel) { 440 case 4: 441 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 442 case 2: 443 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 444 default: 445 max = 2; 446 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 447 } 448 return 0; 449 } 450 451 /* 452 * Converting truecolor samples into palette indices. 453 */ 454 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 455 \ 456 static void \ 457 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 458 VncPalette *palette) { \ 459 uint##bpp##_t *src; \ 460 uint##bpp##_t rgb; \ 461 int i, rep; \ 462 uint8_t idx; \ 463 \ 464 src = (uint##bpp##_t *) buf; \ 465 \ 466 for (i = 0; i < count; i++) { \ 467 \ 468 rgb = *src++; \ 469 rep = 0; \ 470 while (i < count && *src == rgb) { \ 471 rep++, src++, i++; \ 472 } \ 473 idx = palette_idx(palette, rgb); \ 474 /* \ 475 * Should never happen, but don't break everything \ 476 * if it does, use the first color instead \ 477 */ \ 478 if (idx == (uint8_t)-1) { \ 479 idx = 0; \ 480 } \ 481 while (rep >= 0) { \ 482 *buf++ = idx; \ 483 rep--; \ 484 } \ 485 } \ 486 } 487 488 DEFINE_IDX_ENCODE_FUNCTION(16) 489 DEFINE_IDX_ENCODE_FUNCTION(32) 490 491 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 492 \ 493 static void \ 494 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 495 uint##bpp##_t bg, uint##bpp##_t fg) { \ 496 uint##bpp##_t *ptr; \ 497 unsigned int value, mask; \ 498 int aligned_width; \ 499 int x, y, bg_bits; \ 500 \ 501 ptr = (uint##bpp##_t *) buf; \ 502 aligned_width = w - w % 8; \ 503 \ 504 for (y = 0; y < h; y++) { \ 505 for (x = 0; x < aligned_width; x += 8) { \ 506 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 507 if (*ptr++ != bg) { \ 508 break; \ 509 } \ 510 } \ 511 if (bg_bits == 8) { \ 512 *buf++ = 0; \ 513 continue; \ 514 } \ 515 mask = 0x80 >> bg_bits; \ 516 value = mask; \ 517 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 518 mask >>= 1; \ 519 if (*ptr++ != bg) { \ 520 value |= mask; \ 521 } \ 522 } \ 523 *buf++ = (uint8_t)value; \ 524 } \ 525 \ 526 mask = 0x80; \ 527 value = 0; \ 528 if (x >= w) { \ 529 continue; \ 530 } \ 531 \ 532 for (; x < w; x++) { \ 533 if (*ptr++ != bg) { \ 534 value |= mask; \ 535 } \ 536 mask >>= 1; \ 537 } \ 538 *buf++ = (uint8_t)value; \ 539 } \ 540 } 541 542 DEFINE_MONO_ENCODE_FUNCTION(8) 543 DEFINE_MONO_ENCODE_FUNCTION(16) 544 DEFINE_MONO_ENCODE_FUNCTION(32) 545 546 /* 547 * ``Gradient'' filter for 24-bit color samples. 548 * Should be called only when redMax, greenMax and blueMax are 255. 549 * Color components assumed to be byte-aligned. 550 */ 551 552 static void 553 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 554 { 555 uint32_t *buf32; 556 uint32_t pix32; 557 int shift[3]; 558 int *prev; 559 int here[3], upper[3], left[3], upperleft[3]; 560 int prediction; 561 int x, y, c; 562 563 buf32 = (uint32_t *)buf; 564 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 565 566 if (1 /* FIXME: (vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 567 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG) */) { 568 shift[0] = vs->client_pf.rshift; 569 shift[1] = vs->client_pf.gshift; 570 shift[2] = vs->client_pf.bshift; 571 } else { 572 shift[0] = 24 - vs->client_pf.rshift; 573 shift[1] = 24 - vs->client_pf.gshift; 574 shift[2] = 24 - vs->client_pf.bshift; 575 } 576 577 for (y = 0; y < h; y++) { 578 for (c = 0; c < 3; c++) { 579 upper[c] = 0; 580 here[c] = 0; 581 } 582 prev = (int *)vs->tight.gradient.buffer; 583 for (x = 0; x < w; x++) { 584 pix32 = *buf32++; 585 for (c = 0; c < 3; c++) { 586 upperleft[c] = upper[c]; 587 left[c] = here[c]; 588 upper[c] = *prev; 589 here[c] = (int)(pix32 >> shift[c] & 0xFF); 590 *prev++ = here[c]; 591 592 prediction = left[c] + upper[c] - upperleft[c]; 593 if (prediction < 0) { 594 prediction = 0; 595 } else if (prediction > 0xFF) { 596 prediction = 0xFF; 597 } 598 *buf++ = (char)(here[c] - prediction); 599 } 600 } 601 } 602 } 603 604 605 /* 606 * ``Gradient'' filter for other color depths. 607 */ 608 609 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 610 \ 611 static void \ 612 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 613 int w, int h) { \ 614 uint##bpp##_t pix, diff; \ 615 bool endian; \ 616 int *prev; \ 617 int max[3], shift[3]; \ 618 int here[3], upper[3], left[3], upperleft[3]; \ 619 int prediction; \ 620 int x, y, c; \ 621 \ 622 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 623 \ 624 endian = 0; /* FIXME: ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 625 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); */ \ 626 \ 627 max[0] = vs->client_pf.rmax; \ 628 max[1] = vs->client_pf.gmax; \ 629 max[2] = vs->client_pf.bmax; \ 630 shift[0] = vs->client_pf.rshift; \ 631 shift[1] = vs->client_pf.gshift; \ 632 shift[2] = vs->client_pf.bshift; \ 633 \ 634 for (y = 0; y < h; y++) { \ 635 for (c = 0; c < 3; c++) { \ 636 upper[c] = 0; \ 637 here[c] = 0; \ 638 } \ 639 prev = (int *)vs->tight.gradient.buffer; \ 640 for (x = 0; x < w; x++) { \ 641 pix = *buf; \ 642 if (endian) { \ 643 pix = bswap##bpp(pix); \ 644 } \ 645 diff = 0; \ 646 for (c = 0; c < 3; c++) { \ 647 upperleft[c] = upper[c]; \ 648 left[c] = here[c]; \ 649 upper[c] = *prev; \ 650 here[c] = (int)(pix >> shift[c] & max[c]); \ 651 *prev++ = here[c]; \ 652 \ 653 prediction = left[c] + upper[c] - upperleft[c]; \ 654 if (prediction < 0) { \ 655 prediction = 0; \ 656 } else if (prediction > max[c]) { \ 657 prediction = max[c]; \ 658 } \ 659 diff |= ((here[c] - prediction) & max[c]) \ 660 << shift[c]; \ 661 } \ 662 if (endian) { \ 663 diff = bswap##bpp(diff); \ 664 } \ 665 *buf++ = diff; \ 666 } \ 667 } \ 668 } 669 670 DEFINE_GRADIENT_FILTER_FUNCTION(16) 671 DEFINE_GRADIENT_FILTER_FUNCTION(32) 672 673 /* 674 * Check if a rectangle is all of the same color. If needSameColor is 675 * set to non-zero, then also check that its color equals to the 676 * *colorPtr value. The result is 1 if the test is successful, and in 677 * that case new color will be stored in *colorPtr. 678 */ 679 680 static bool 681 check_solid_tile32(VncState *vs, int x, int y, int w, int h, 682 uint32_t *color, bool samecolor) 683 { 684 VncDisplay *vd = vs->vd; 685 uint32_t *fbptr; 686 uint32_t c; 687 int dx, dy; 688 689 fbptr = vnc_server_fb_ptr(vd, x, y); 690 691 c = *fbptr; 692 if (samecolor && (uint32_t)c != *color) { 693 return false; 694 } 695 696 for (dy = 0; dy < h; dy++) { 697 for (dx = 0; dx < w; dx++) { 698 if (c != fbptr[dx]) { 699 return false; 700 } 701 } 702 fbptr = (uint32_t *) 703 ((uint8_t *)fbptr + vnc_server_fb_stride(vd)); 704 } 705 706 *color = (uint32_t)c; 707 return true; 708 } 709 710 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 711 uint32_t* color, bool samecolor) 712 { 713 switch (VNC_SERVER_FB_BYTES) { 714 case 4: 715 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 716 } 717 } 718 719 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 720 uint32_t color, int *w_ptr, int *h_ptr) 721 { 722 int dx, dy, dw, dh; 723 int w_prev; 724 int w_best = 0, h_best = 0; 725 726 w_prev = w; 727 728 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 729 730 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 731 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 732 733 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 734 break; 735 } 736 737 for (dx = x + dw; dx < x + w_prev;) { 738 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 739 740 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 741 break; 742 } 743 dx += dw; 744 } 745 746 w_prev = dx - x; 747 if (w_prev * (dy + dh - y) > w_best * h_best) { 748 w_best = w_prev; 749 h_best = dy + dh - y; 750 } 751 } 752 753 *w_ptr = w_best; 754 *h_ptr = h_best; 755 } 756 757 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 758 uint32_t color, int *x_ptr, int *y_ptr, 759 int *w_ptr, int *h_ptr) 760 { 761 int cx, cy; 762 763 /* Try to extend the area upwards. */ 764 for ( cy = *y_ptr - 1; 765 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 766 cy-- ); 767 *h_ptr += *y_ptr - (cy + 1); 768 *y_ptr = cy + 1; 769 770 /* ... downwards. */ 771 for ( cy = *y_ptr + *h_ptr; 772 cy < y + h && 773 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 774 cy++ ); 775 *h_ptr += cy - (*y_ptr + *h_ptr); 776 777 /* ... to the left. */ 778 for ( cx = *x_ptr - 1; 779 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 780 cx-- ); 781 *w_ptr += *x_ptr - (cx + 1); 782 *x_ptr = cx + 1; 783 784 /* ... to the right. */ 785 for ( cx = *x_ptr + *w_ptr; 786 cx < x + w && 787 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 788 cx++ ); 789 *w_ptr += cx - (*x_ptr + *w_ptr); 790 } 791 792 static int tight_init_stream(VncState *vs, int stream_id, 793 int level, int strategy) 794 { 795 z_streamp zstream = &vs->tight.stream[stream_id]; 796 797 if (zstream->opaque == NULL) { 798 int err; 799 800 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 801 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 802 zstream->zalloc = vnc_zlib_zalloc; 803 zstream->zfree = vnc_zlib_zfree; 804 805 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 806 MAX_MEM_LEVEL, strategy); 807 808 if (err != Z_OK) { 809 fprintf(stderr, "VNC: error initializing zlib\n"); 810 return -1; 811 } 812 813 vs->tight.levels[stream_id] = level; 814 zstream->opaque = vs; 815 } 816 817 if (vs->tight.levels[stream_id] != level) { 818 if (deflateParams(zstream, level, strategy) != Z_OK) { 819 return -1; 820 } 821 vs->tight.levels[stream_id] = level; 822 } 823 return 0; 824 } 825 826 static void tight_send_compact_size(VncState *vs, size_t len) 827 { 828 int lpc = 0; 829 int bytes = 0; 830 char buf[3] = {0, 0, 0}; 831 832 buf[bytes++] = len & 0x7F; 833 if (len > 0x7F) { 834 buf[bytes-1] |= 0x80; 835 buf[bytes++] = (len >> 7) & 0x7F; 836 if (len > 0x3FFF) { 837 buf[bytes-1] |= 0x80; 838 buf[bytes++] = (len >> 14) & 0xFF; 839 } 840 } 841 for (lpc = 0; lpc < bytes; lpc++) { 842 vnc_write_u8(vs, buf[lpc]); 843 } 844 } 845 846 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 847 int level, int strategy) 848 { 849 z_streamp zstream = &vs->tight.stream[stream_id]; 850 int previous_out; 851 852 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 853 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 854 return bytes; 855 } 856 857 if (tight_init_stream(vs, stream_id, level, strategy)) { 858 return -1; 859 } 860 861 /* reserve memory in output buffer */ 862 buffer_reserve(&vs->tight.zlib, bytes + 64); 863 864 /* set pointers */ 865 zstream->next_in = vs->tight.tight.buffer; 866 zstream->avail_in = vs->tight.tight.offset; 867 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 868 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 869 previous_out = zstream->avail_out; 870 zstream->data_type = Z_BINARY; 871 872 /* start encoding */ 873 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 874 fprintf(stderr, "VNC: error during tight compression\n"); 875 return -1; 876 } 877 878 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 879 /* ...how much data has actually been produced by deflate() */ 880 bytes = previous_out - zstream->avail_out; 881 882 tight_send_compact_size(vs, bytes); 883 vnc_write(vs, vs->tight.zlib.buffer, bytes); 884 885 buffer_reset(&vs->tight.zlib); 886 887 return bytes; 888 } 889 890 /* 891 * Subencoding implementations. 892 */ 893 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 894 { 895 uint32_t *buf32; 896 uint32_t pix; 897 int rshift, gshift, bshift; 898 899 buf32 = (uint32_t *)buf; 900 901 if (1 /* FIXME: (vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 902 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG) */) { 903 rshift = vs->client_pf.rshift; 904 gshift = vs->client_pf.gshift; 905 bshift = vs->client_pf.bshift; 906 } else { 907 rshift = 24 - vs->client_pf.rshift; 908 gshift = 24 - vs->client_pf.gshift; 909 bshift = 24 - vs->client_pf.bshift; 910 } 911 912 if (ret) { 913 *ret = count * 3; 914 } 915 916 while (count--) { 917 pix = *buf32++; 918 *buf++ = (char)(pix >> rshift); 919 *buf++ = (char)(pix >> gshift); 920 *buf++ = (char)(pix >> bshift); 921 } 922 } 923 924 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h) 925 { 926 int stream = 0; 927 ssize_t bytes; 928 929 #ifdef CONFIG_VNC_PNG 930 if (tight_can_send_png_rect(vs, w, h)) { 931 return send_png_rect(vs, x, y, w, h, NULL); 932 } 933 #endif 934 935 vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ 936 937 if (vs->tight.pixel24) { 938 tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset); 939 bytes = 3; 940 } else { 941 bytes = vs->client_pf.bytes_per_pixel; 942 } 943 944 bytes = tight_compress_data(vs, stream, w * h * bytes, 945 tight_conf[vs->tight.compression].raw_zlib_level, 946 Z_DEFAULT_STRATEGY); 947 948 return (bytes >= 0); 949 } 950 951 static int send_solid_rect(VncState *vs) 952 { 953 size_t bytes; 954 955 vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ 956 957 if (vs->tight.pixel24) { 958 tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset); 959 bytes = 3; 960 } else { 961 bytes = vs->client_pf.bytes_per_pixel; 962 } 963 964 vnc_write(vs, vs->tight.tight.buffer, bytes); 965 return 1; 966 } 967 968 static int send_mono_rect(VncState *vs, int x, int y, 969 int w, int h, uint32_t bg, uint32_t fg) 970 { 971 ssize_t bytes; 972 int stream = 1; 973 int level = tight_conf[vs->tight.compression].mono_zlib_level; 974 975 #ifdef CONFIG_VNC_PNG 976 if (tight_can_send_png_rect(vs, w, h)) { 977 int ret; 978 int bpp = vs->client_pf.bytes_per_pixel * 8; 979 VncPalette *palette = palette_new(2, bpp); 980 981 palette_put(palette, bg); 982 palette_put(palette, fg); 983 ret = send_png_rect(vs, x, y, w, h, palette); 984 palette_destroy(palette); 985 return ret; 986 } 987 #endif 988 989 bytes = ((w + 7) / 8) * h; 990 991 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 992 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 993 vnc_write_u8(vs, 1); 994 995 switch (vs->client_pf.bytes_per_pixel) { 996 case 4: 997 { 998 uint32_t buf[2] = {bg, fg}; 999 size_t ret = sizeof (buf); 1000 1001 if (vs->tight.pixel24) { 1002 tight_pack24(vs, (unsigned char*)buf, 2, &ret); 1003 } 1004 vnc_write(vs, buf, ret); 1005 1006 tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg); 1007 break; 1008 } 1009 case 2: 1010 vnc_write(vs, &bg, 2); 1011 vnc_write(vs, &fg, 2); 1012 tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg); 1013 break; 1014 default: 1015 vnc_write_u8(vs, bg); 1016 vnc_write_u8(vs, fg); 1017 tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg); 1018 break; 1019 } 1020 vs->tight.tight.offset = bytes; 1021 1022 bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); 1023 return (bytes >= 0); 1024 } 1025 1026 struct palette_cb_priv { 1027 VncState *vs; 1028 uint8_t *header; 1029 #ifdef CONFIG_VNC_PNG 1030 png_colorp png_palette; 1031 #endif 1032 }; 1033 1034 static void write_palette(int idx, uint32_t color, void *opaque) 1035 { 1036 struct palette_cb_priv *priv = opaque; 1037 VncState *vs = priv->vs; 1038 uint32_t bytes = vs->client_pf.bytes_per_pixel; 1039 1040 if (bytes == 4) { 1041 ((uint32_t*)priv->header)[idx] = color; 1042 } else { 1043 ((uint16_t*)priv->header)[idx] = color; 1044 } 1045 } 1046 1047 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h) 1048 { 1049 int stream = 3; 1050 int level = tight_conf[vs->tight.compression].gradient_zlib_level; 1051 ssize_t bytes; 1052 1053 if (vs->client_pf.bytes_per_pixel == 1) { 1054 return send_full_color_rect(vs, x, y, w, h); 1055 } 1056 1057 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1058 vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT); 1059 1060 buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int)); 1061 1062 if (vs->tight.pixel24) { 1063 tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h); 1064 bytes = 3; 1065 } else if (vs->client_pf.bytes_per_pixel == 4) { 1066 tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h); 1067 bytes = 4; 1068 } else { 1069 tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h); 1070 bytes = 2; 1071 } 1072 1073 buffer_reset(&vs->tight.gradient); 1074 1075 bytes = w * h * bytes; 1076 vs->tight.tight.offset = bytes; 1077 1078 bytes = tight_compress_data(vs, stream, bytes, 1079 level, Z_FILTERED); 1080 return (bytes >= 0); 1081 } 1082 1083 static int send_palette_rect(VncState *vs, int x, int y, 1084 int w, int h, VncPalette *palette) 1085 { 1086 int stream = 2; 1087 int level = tight_conf[vs->tight.compression].idx_zlib_level; 1088 int colors; 1089 ssize_t bytes; 1090 1091 #ifdef CONFIG_VNC_PNG 1092 if (tight_can_send_png_rect(vs, w, h)) { 1093 return send_png_rect(vs, x, y, w, h, palette); 1094 } 1095 #endif 1096 1097 colors = palette_size(palette); 1098 1099 vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); 1100 vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); 1101 vnc_write_u8(vs, colors - 1); 1102 1103 switch (vs->client_pf.bytes_per_pixel) { 1104 case 4: 1105 { 1106 size_t old_offset, offset; 1107 uint32_t header[palette_size(palette)]; 1108 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1109 1110 old_offset = vs->output.offset; 1111 palette_iter(palette, write_palette, &priv); 1112 vnc_write(vs, header, sizeof(header)); 1113 1114 if (vs->tight.pixel24) { 1115 tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); 1116 vs->output.offset = old_offset + offset; 1117 } 1118 1119 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1120 break; 1121 } 1122 case 2: 1123 { 1124 uint16_t header[palette_size(palette)]; 1125 struct palette_cb_priv priv = { vs, (uint8_t *)header }; 1126 1127 palette_iter(palette, write_palette, &priv); 1128 vnc_write(vs, header, sizeof(header)); 1129 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1130 break; 1131 } 1132 default: 1133 return -1; /* No palette for 8bits colors */ 1134 break; 1135 } 1136 bytes = w * h; 1137 vs->tight.tight.offset = bytes; 1138 1139 bytes = tight_compress_data(vs, stream, bytes, 1140 level, Z_DEFAULT_STRATEGY); 1141 return (bytes >= 0); 1142 } 1143 1144 /* 1145 * JPEG compression stuff. 1146 */ 1147 #ifdef CONFIG_VNC_JPEG 1148 /* 1149 * Destination manager implementation for JPEG library. 1150 */ 1151 1152 /* This is called once per encoding */ 1153 static void jpeg_init_destination(j_compress_ptr cinfo) 1154 { 1155 VncState *vs = cinfo->client_data; 1156 Buffer *buffer = &vs->tight.jpeg; 1157 1158 cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset; 1159 cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset); 1160 } 1161 1162 /* This is called when we ran out of buffer (shouldn't happen!) */ 1163 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo) 1164 { 1165 VncState *vs = cinfo->client_data; 1166 Buffer *buffer = &vs->tight.jpeg; 1167 1168 buffer->offset = buffer->capacity; 1169 buffer_reserve(buffer, 2048); 1170 jpeg_init_destination(cinfo); 1171 return TRUE; 1172 } 1173 1174 /* This is called when we are done processing data */ 1175 static void jpeg_term_destination(j_compress_ptr cinfo) 1176 { 1177 VncState *vs = cinfo->client_data; 1178 Buffer *buffer = &vs->tight.jpeg; 1179 1180 buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer; 1181 } 1182 1183 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality) 1184 { 1185 struct jpeg_compress_struct cinfo; 1186 struct jpeg_error_mgr jerr; 1187 struct jpeg_destination_mgr manager; 1188 pixman_image_t *linebuf; 1189 JSAMPROW row[1]; 1190 uint8_t *buf; 1191 int dy; 1192 1193 if (surface_bytes_per_pixel(vs->vd->ds) == 1) { 1194 return send_full_color_rect(vs, x, y, w, h); 1195 } 1196 1197 buffer_reserve(&vs->tight.jpeg, 2048); 1198 1199 cinfo.err = jpeg_std_error(&jerr); 1200 jpeg_create_compress(&cinfo); 1201 1202 cinfo.client_data = vs; 1203 cinfo.image_width = w; 1204 cinfo.image_height = h; 1205 cinfo.input_components = 3; 1206 cinfo.in_color_space = JCS_RGB; 1207 1208 jpeg_set_defaults(&cinfo); 1209 jpeg_set_quality(&cinfo, quality, true); 1210 1211 manager.init_destination = jpeg_init_destination; 1212 manager.empty_output_buffer = jpeg_empty_output_buffer; 1213 manager.term_destination = jpeg_term_destination; 1214 cinfo.dest = &manager; 1215 1216 jpeg_start_compress(&cinfo, true); 1217 1218 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1219 buf = (uint8_t *)pixman_image_get_data(linebuf); 1220 row[0] = buf; 1221 for (dy = 0; dy < h; dy++) { 1222 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1223 jpeg_write_scanlines(&cinfo, row, 1); 1224 } 1225 qemu_pixman_image_unref(linebuf); 1226 1227 jpeg_finish_compress(&cinfo); 1228 jpeg_destroy_compress(&cinfo); 1229 1230 vnc_write_u8(vs, VNC_TIGHT_JPEG << 4); 1231 1232 tight_send_compact_size(vs, vs->tight.jpeg.offset); 1233 vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset); 1234 buffer_reset(&vs->tight.jpeg); 1235 1236 return 1; 1237 } 1238 #endif /* CONFIG_VNC_JPEG */ 1239 1240 /* 1241 * PNG compression stuff. 1242 */ 1243 #ifdef CONFIG_VNC_PNG 1244 static void write_png_palette(int idx, uint32_t pix, void *opaque) 1245 { 1246 struct palette_cb_priv *priv = opaque; 1247 VncState *vs = priv->vs; 1248 png_colorp color = &priv->png_palette[idx]; 1249 1250 if (vs->tight.pixel24) 1251 { 1252 color->red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1253 color->green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1254 color->blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1255 } 1256 else 1257 { 1258 int red, green, blue; 1259 1260 red = (pix >> vs->client_pf.rshift) & vs->client_pf.rmax; 1261 green = (pix >> vs->client_pf.gshift) & vs->client_pf.gmax; 1262 blue = (pix >> vs->client_pf.bshift) & vs->client_pf.bmax; 1263 color->red = ((red * 255 + vs->client_pf.rmax / 2) / 1264 vs->client_pf.rmax); 1265 color->green = ((green * 255 + vs->client_pf.gmax / 2) / 1266 vs->client_pf.gmax); 1267 color->blue = ((blue * 255 + vs->client_pf.bmax / 2) / 1268 vs->client_pf.bmax); 1269 } 1270 } 1271 1272 static void png_write_data(png_structp png_ptr, png_bytep data, 1273 png_size_t length) 1274 { 1275 VncState *vs = png_get_io_ptr(png_ptr); 1276 1277 buffer_reserve(&vs->tight.png, vs->tight.png.offset + length); 1278 memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length); 1279 1280 vs->tight.png.offset += length; 1281 } 1282 1283 static void png_flush_data(png_structp png_ptr) 1284 { 1285 } 1286 1287 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size) 1288 { 1289 return g_malloc(size); 1290 } 1291 1292 static void vnc_png_free(png_structp png_ptr, png_voidp ptr) 1293 { 1294 g_free(ptr); 1295 } 1296 1297 static int send_png_rect(VncState *vs, int x, int y, int w, int h, 1298 VncPalette *palette) 1299 { 1300 png_byte color_type; 1301 png_structp png_ptr; 1302 png_infop info_ptr; 1303 png_colorp png_palette = NULL; 1304 pixman_image_t *linebuf; 1305 int level = tight_png_conf[vs->tight.compression].png_zlib_level; 1306 int filters = tight_png_conf[vs->tight.compression].png_filters; 1307 uint8_t *buf; 1308 int dy; 1309 1310 png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, 1311 NULL, vnc_png_malloc, vnc_png_free); 1312 1313 if (png_ptr == NULL) 1314 return -1; 1315 1316 info_ptr = png_create_info_struct(png_ptr); 1317 1318 if (info_ptr == NULL) { 1319 png_destroy_write_struct(&png_ptr, NULL); 1320 return -1; 1321 } 1322 1323 png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data); 1324 png_set_compression_level(png_ptr, level); 1325 png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters); 1326 1327 if (palette) { 1328 color_type = PNG_COLOR_TYPE_PALETTE; 1329 } else { 1330 color_type = PNG_COLOR_TYPE_RGB; 1331 } 1332 1333 png_set_IHDR(png_ptr, info_ptr, w, h, 1334 8, color_type, PNG_INTERLACE_NONE, 1335 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); 1336 1337 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1338 struct palette_cb_priv priv; 1339 1340 png_palette = png_malloc(png_ptr, sizeof(*png_palette) * 1341 palette_size(palette)); 1342 1343 priv.vs = vs; 1344 priv.png_palette = png_palette; 1345 palette_iter(palette, write_png_palette, &priv); 1346 1347 png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette)); 1348 1349 if (vs->client_pf.bytes_per_pixel == 4) { 1350 tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette); 1351 } else { 1352 tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette); 1353 } 1354 } 1355 1356 png_write_info(png_ptr, info_ptr); 1357 1358 buffer_reserve(&vs->tight.png, 2048); 1359 linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, w); 1360 buf = (uint8_t *)pixman_image_get_data(linebuf); 1361 for (dy = 0; dy < h; dy++) 1362 { 1363 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1364 memcpy(buf, vs->tight.tight.buffer + (dy * w), w); 1365 } else { 1366 qemu_pixman_linebuf_fill(linebuf, vs->vd->server, w, x, y + dy); 1367 } 1368 png_write_row(png_ptr, buf); 1369 } 1370 qemu_pixman_image_unref(linebuf); 1371 1372 png_write_end(png_ptr, NULL); 1373 1374 if (color_type == PNG_COLOR_TYPE_PALETTE) { 1375 png_free(png_ptr, png_palette); 1376 } 1377 1378 png_destroy_write_struct(&png_ptr, &info_ptr); 1379 1380 vnc_write_u8(vs, VNC_TIGHT_PNG << 4); 1381 1382 tight_send_compact_size(vs, vs->tight.png.offset); 1383 vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset); 1384 buffer_reset(&vs->tight.png); 1385 return 1; 1386 } 1387 #endif /* CONFIG_VNC_PNG */ 1388 1389 static void vnc_tight_start(VncState *vs) 1390 { 1391 buffer_reset(&vs->tight.tight); 1392 1393 // make the output buffer be the zlib buffer, so we can compress it later 1394 vs->tight.tmp = vs->output; 1395 vs->output = vs->tight.tight; 1396 } 1397 1398 static void vnc_tight_stop(VncState *vs) 1399 { 1400 // switch back to normal output/zlib buffers 1401 vs->tight.tight = vs->output; 1402 vs->output = vs->tight.tmp; 1403 } 1404 1405 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h, 1406 int bg, int fg, int colors, VncPalette *palette) 1407 { 1408 int ret; 1409 1410 if (colors == 0) { 1411 if (tight_detect_smooth_image(vs, w, h)) { 1412 ret = send_gradient_rect(vs, x, y, w, h); 1413 } else { 1414 ret = send_full_color_rect(vs, x, y, w, h); 1415 } 1416 } else if (colors == 1) { 1417 ret = send_solid_rect(vs); 1418 } else if (colors == 2) { 1419 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1420 } else if (colors <= 256) { 1421 ret = send_palette_rect(vs, x, y, w, h, palette); 1422 } else { 1423 ret = 0; 1424 } 1425 return ret; 1426 } 1427 1428 #ifdef CONFIG_VNC_JPEG 1429 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h, 1430 int bg, int fg, int colors, 1431 VncPalette *palette, bool force) 1432 { 1433 int ret; 1434 1435 if (colors == 0) { 1436 if (force || (tight_jpeg_conf[vs->tight.quality].jpeg_full && 1437 tight_detect_smooth_image(vs, w, h))) { 1438 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1439 1440 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1441 } else { 1442 ret = send_full_color_rect(vs, x, y, w, h); 1443 } 1444 } else if (colors == 1) { 1445 ret = send_solid_rect(vs); 1446 } else if (colors == 2) { 1447 ret = send_mono_rect(vs, x, y, w, h, bg, fg); 1448 } else if (colors <= 256) { 1449 if (force || (colors > 96 && 1450 tight_jpeg_conf[vs->tight.quality].jpeg_idx && 1451 tight_detect_smooth_image(vs, w, h))) { 1452 int quality = tight_conf[vs->tight.quality].jpeg_quality; 1453 1454 ret = send_jpeg_rect(vs, x, y, w, h, quality); 1455 } else { 1456 ret = send_palette_rect(vs, x, y, w, h, palette); 1457 } 1458 } else { 1459 ret = 0; 1460 } 1461 return ret; 1462 } 1463 #endif 1464 1465 static int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1466 { 1467 VncPalette *palette = NULL; 1468 uint32_t bg = 0, fg = 0; 1469 int colors; 1470 int ret = 0; 1471 #ifdef CONFIG_VNC_JPEG 1472 bool force_jpeg = false; 1473 bool allow_jpeg = true; 1474 #endif 1475 1476 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1477 1478 vnc_tight_start(vs); 1479 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1480 vnc_tight_stop(vs); 1481 1482 #ifdef CONFIG_VNC_JPEG 1483 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) { 1484 double freq = vnc_update_freq(vs, x, y, w, h); 1485 1486 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) { 1487 allow_jpeg = false; 1488 } 1489 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1490 force_jpeg = true; 1491 vnc_sent_lossy_rect(vs, x, y, w, h); 1492 } 1493 } 1494 #endif 1495 1496 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette); 1497 1498 #ifdef CONFIG_VNC_JPEG 1499 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) { 1500 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette, 1501 force_jpeg); 1502 } else { 1503 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1504 } 1505 #else 1506 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1507 #endif 1508 1509 palette_destroy(palette); 1510 return ret; 1511 } 1512 1513 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1514 { 1515 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1516 1517 vnc_tight_start(vs); 1518 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1519 vnc_tight_stop(vs); 1520 1521 return send_solid_rect(vs); 1522 } 1523 1524 static int send_rect_simple(VncState *vs, int x, int y, int w, int h, 1525 bool split) 1526 { 1527 int max_size, max_width; 1528 int max_sub_width, max_sub_height; 1529 int dx, dy; 1530 int rw, rh; 1531 int n = 0; 1532 1533 max_size = tight_conf[vs->tight.compression].max_rect_size; 1534 max_width = tight_conf[vs->tight.compression].max_rect_width; 1535 1536 if (split && (w > max_width || w * h > max_size)) { 1537 max_sub_width = (w > max_width) ? max_width : w; 1538 max_sub_height = max_size / max_sub_width; 1539 1540 for (dy = 0; dy < h; dy += max_sub_height) { 1541 for (dx = 0; dx < w; dx += max_width) { 1542 rw = MIN(max_sub_width, w - dx); 1543 rh = MIN(max_sub_height, h - dy); 1544 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1545 } 1546 } 1547 } else { 1548 n += send_sub_rect(vs, x, y, w, h); 1549 } 1550 1551 return n; 1552 } 1553 1554 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1555 int w, int h, int max_rows) 1556 { 1557 int dx, dy, dw, dh; 1558 int n = 0; 1559 1560 /* Try to find large solid-color areas and send them separately. */ 1561 1562 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1563 1564 /* If a rectangle becomes too large, send its upper part now. */ 1565 1566 if (dy - y >= max_rows) { 1567 n += send_rect_simple(vs, x, y, w, max_rows, true); 1568 y += max_rows; 1569 h -= max_rows; 1570 } 1571 1572 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1573 1574 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1575 uint32_t color_value; 1576 int x_best, y_best, w_best, h_best; 1577 1578 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1579 1580 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1581 continue ; 1582 } 1583 1584 /* Get dimensions of solid-color area. */ 1585 1586 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1587 color_value, &w_best, &h_best); 1588 1589 /* Make sure a solid rectangle is large enough 1590 (or the whole rectangle is of the same color). */ 1591 1592 if (w_best * h_best != w * h && 1593 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1594 continue; 1595 } 1596 1597 /* Try to extend solid rectangle to maximum size. */ 1598 1599 x_best = dx; y_best = dy; 1600 extend_solid_area(vs, x, y, w, h, color_value, 1601 &x_best, &y_best, &w_best, &h_best); 1602 1603 /* Send rectangles at top and left to solid-color area. */ 1604 1605 if (y_best != y) { 1606 n += send_rect_simple(vs, x, y, w, y_best-y, true); 1607 } 1608 if (x_best != x) { 1609 n += tight_send_framebuffer_update(vs, x, y_best, 1610 x_best-x, h_best); 1611 } 1612 1613 /* Send solid-color rectangle. */ 1614 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1615 1616 /* Send remaining rectangles (at right and bottom). */ 1617 1618 if (x_best + w_best != x + w) { 1619 n += tight_send_framebuffer_update(vs, x_best+w_best, 1620 y_best, 1621 w-(x_best-x)-w_best, 1622 h_best); 1623 } 1624 if (y_best + h_best != y + h) { 1625 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1626 w, h-(y_best-y)-h_best); 1627 } 1628 1629 /* Return after all recursive calls are done. */ 1630 return n; 1631 } 1632 } 1633 return n + send_rect_simple(vs, x, y, w, h, true); 1634 } 1635 1636 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1637 int w, int h) 1638 { 1639 int max_rows; 1640 1641 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF && 1642 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) { 1643 vs->tight.pixel24 = true; 1644 } else { 1645 vs->tight.pixel24 = false; 1646 } 1647 1648 #ifdef CONFIG_VNC_JPEG 1649 if (vs->tight.quality != (uint8_t)-1) { 1650 double freq = vnc_update_freq(vs, x, y, w, h); 1651 1652 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1653 return send_rect_simple(vs, x, y, w, h, false); 1654 } 1655 } 1656 #endif 1657 1658 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1659 return send_rect_simple(vs, x, y, w, h, true); 1660 } 1661 1662 /* Calculate maximum number of rows in one non-solid rectangle. */ 1663 1664 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1665 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1666 1667 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1668 } 1669 1670 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1671 int w, int h) 1672 { 1673 vs->tight.type = VNC_ENCODING_TIGHT; 1674 return tight_send_framebuffer_update(vs, x, y, w, h); 1675 } 1676 1677 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1678 int w, int h) 1679 { 1680 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1681 return tight_send_framebuffer_update(vs, x, y, w, h); 1682 } 1683 1684 void vnc_tight_clear(VncState *vs) 1685 { 1686 int i; 1687 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1688 if (vs->tight.stream[i].opaque) { 1689 deflateEnd(&vs->tight.stream[i]); 1690 } 1691 } 1692 1693 buffer_free(&vs->tight.tight); 1694 buffer_free(&vs->tight.zlib); 1695 buffer_free(&vs->tight.gradient); 1696 #ifdef CONFIG_VNC_JPEG 1697 buffer_free(&vs->tight.jpeg); 1698 #endif 1699 #ifdef CONFIG_VNC_PNG 1700 buffer_free(&vs->tight.png); 1701 #endif 1702 } 1703