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 /* 95% smooth or more ... */ 185 if (stats[0] * 33 / pixels >= 95) { 186 return 0; 187 } 188 189 errors = 0; 190 for (c = 1; c < 8; c++) { 191 errors += stats[c] * (c * c); 192 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { 193 return 0; 194 } 195 } 196 for (; c < 256; c++) { 197 errors += stats[c] * (c * c); 198 } 199 errors /= (pixels * 3 - stats[0]); 200 201 return errors; 202 } 203 204 #define DEFINE_DETECT_FUNCTION(bpp) \ 205 \ 206 static unsigned int \ 207 tight_detect_smooth_image##bpp(VncState *vs, int w, int h) { \ 208 bool endian; \ 209 uint##bpp##_t pix; \ 210 int max[3], shift[3]; \ 211 int x, y, d, dx; \ 212 unsigned int c; \ 213 unsigned int stats[256]; \ 214 int pixels = 0; \ 215 int sample, sum, left[3]; \ 216 unsigned int errors; \ 217 unsigned char *buf = vs->tight.tight.buffer; \ 218 \ 219 endian = 0; /* FIXME: ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 220 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); */ \ 221 \ 222 \ 223 max[0] = vs->client_pf.rmax; \ 224 max[1] = vs->client_pf.gmax; \ 225 max[2] = vs->client_pf.bmax; \ 226 shift[0] = vs->client_pf.rshift; \ 227 shift[1] = vs->client_pf.gshift; \ 228 shift[2] = vs->client_pf.bshift; \ 229 \ 230 memset(stats, 0, sizeof(stats)); \ 231 \ 232 y = 0, x = 0; \ 233 while (y < h && x < w) { \ 234 for (d = 0; d < h - y && \ 235 d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) { \ 236 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d]; \ 237 if (endian) { \ 238 pix = bswap##bpp(pix); \ 239 } \ 240 for (c = 0; c < 3; c++) { \ 241 left[c] = (int)(pix >> shift[c] & max[c]); \ 242 } \ 243 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; \ 244 dx++) { \ 245 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx]; \ 246 if (endian) { \ 247 pix = bswap##bpp(pix); \ 248 } \ 249 sum = 0; \ 250 for (c = 0; c < 3; c++) { \ 251 sample = (int)(pix >> shift[c] & max[c]); \ 252 sum += abs(sample - left[c]); \ 253 left[c] = sample; \ 254 } \ 255 if (sum > 255) { \ 256 sum = 255; \ 257 } \ 258 stats[sum]++; \ 259 pixels++; \ 260 } \ 261 } \ 262 if (w > h) { \ 263 x += h; \ 264 y = 0; \ 265 } else { \ 266 x = 0; \ 267 y += w; \ 268 } \ 269 } \ 270 \ 271 if ((stats[0] + stats[1]) * 100 / pixels >= 90) { \ 272 return 0; \ 273 } \ 274 \ 275 errors = 0; \ 276 for (c = 1; c < 8; c++) { \ 277 errors += stats[c] * (c * c); \ 278 if (stats[c] == 0 || stats[c] > stats[c-1] * 2) { \ 279 return 0; \ 280 } \ 281 } \ 282 for (; c < 256; c++) { \ 283 errors += stats[c] * (c * c); \ 284 } \ 285 errors /= (pixels - stats[0]); \ 286 \ 287 return errors; \ 288 } 289 290 DEFINE_DETECT_FUNCTION(16) 291 DEFINE_DETECT_FUNCTION(32) 292 293 static int 294 tight_detect_smooth_image(VncState *vs, int w, int h) 295 { 296 unsigned int errors; 297 int compression = vs->tight.compression; 298 int quality = vs->tight.quality; 299 300 if (!vs->vd->lossy) { 301 return 0; 302 } 303 304 if (surface_bytes_per_pixel(vs->vd->ds) == 1 || 305 vs->client_pf.bytes_per_pixel == 1 || 306 w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) { 307 return 0; 308 } 309 310 if (vs->tight.quality != (uint8_t)-1) { 311 if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) { 312 return 0; 313 } 314 } else { 315 if (w * h < tight_conf[compression].gradient_min_rect_size) { 316 return 0; 317 } 318 } 319 320 if (vs->client_pf.bytes_per_pixel == 4) { 321 if (vs->tight.pixel24) { 322 errors = tight_detect_smooth_image24(vs, w, h); 323 if (vs->tight.quality != (uint8_t)-1) { 324 return (errors < tight_conf[quality].jpeg_threshold24); 325 } 326 return (errors < tight_conf[compression].gradient_threshold24); 327 } else { 328 errors = tight_detect_smooth_image32(vs, w, h); 329 } 330 } else { 331 errors = tight_detect_smooth_image16(vs, w, h); 332 } 333 if (quality != -1) { 334 return (errors < tight_conf[quality].jpeg_threshold); 335 } 336 return (errors < tight_conf[compression].gradient_threshold); 337 } 338 339 /* 340 * Code to determine how many different colors used in rectangle. 341 */ 342 #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ 343 \ 344 static int \ 345 tight_fill_palette##bpp(VncState *vs, int x, int y, \ 346 int max, size_t count, \ 347 uint32_t *bg, uint32_t *fg, \ 348 VncPalette **palette) { \ 349 uint##bpp##_t *data; \ 350 uint##bpp##_t c0, c1, ci; \ 351 int i, n0, n1; \ 352 \ 353 data = (uint##bpp##_t *)vs->tight.tight.buffer; \ 354 \ 355 c0 = data[0]; \ 356 i = 1; \ 357 while (i < count && data[i] == c0) \ 358 i++; \ 359 if (i >= count) { \ 360 *bg = *fg = c0; \ 361 return 1; \ 362 } \ 363 \ 364 if (max < 2) { \ 365 return 0; \ 366 } \ 367 \ 368 n0 = i; \ 369 c1 = data[i]; \ 370 n1 = 0; \ 371 for (i++; i < count; i++) { \ 372 ci = data[i]; \ 373 if (ci == c0) { \ 374 n0++; \ 375 } else if (ci == c1) { \ 376 n1++; \ 377 } else \ 378 break; \ 379 } \ 380 if (i >= count) { \ 381 if (n0 > n1) { \ 382 *bg = (uint32_t)c0; \ 383 *fg = (uint32_t)c1; \ 384 } else { \ 385 *bg = (uint32_t)c1; \ 386 *fg = (uint32_t)c0; \ 387 } \ 388 return 2; \ 389 } \ 390 \ 391 if (max == 2) { \ 392 return 0; \ 393 } \ 394 \ 395 *palette = palette_new(max, bpp); \ 396 palette_put(*palette, c0); \ 397 palette_put(*palette, c1); \ 398 palette_put(*palette, ci); \ 399 \ 400 for (i++; i < count; i++) { \ 401 if (data[i] == ci) { \ 402 continue; \ 403 } else { \ 404 ci = data[i]; \ 405 if (!palette_put(*palette, (uint32_t)ci)) { \ 406 return 0; \ 407 } \ 408 } \ 409 } \ 410 \ 411 return palette_size(*palette); \ 412 } 413 414 DEFINE_FILL_PALETTE_FUNCTION(8) 415 DEFINE_FILL_PALETTE_FUNCTION(16) 416 DEFINE_FILL_PALETTE_FUNCTION(32) 417 418 static int tight_fill_palette(VncState *vs, int x, int y, 419 size_t count, uint32_t *bg, uint32_t *fg, 420 VncPalette **palette) 421 { 422 int max; 423 424 max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor; 425 if (max < 2 && 426 count >= tight_conf[vs->tight.compression].mono_min_rect_size) { 427 max = 2; 428 } 429 if (max >= 256) { 430 max = 256; 431 } 432 433 switch (vs->client_pf.bytes_per_pixel) { 434 case 4: 435 return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); 436 case 2: 437 return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); 438 default: 439 max = 2; 440 return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); 441 } 442 return 0; 443 } 444 445 /* 446 * Converting truecolor samples into palette indices. 447 */ 448 #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ 449 \ 450 static void \ 451 tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ 452 VncPalette *palette) { \ 453 uint##bpp##_t *src; \ 454 uint##bpp##_t rgb; \ 455 int i, rep; \ 456 uint8_t idx; \ 457 \ 458 src = (uint##bpp##_t *) buf; \ 459 \ 460 for (i = 0; i < count; i++) { \ 461 \ 462 rgb = *src++; \ 463 rep = 0; \ 464 while (i < count && *src == rgb) { \ 465 rep++, src++, i++; \ 466 } \ 467 idx = palette_idx(palette, rgb); \ 468 /* \ 469 * Should never happen, but don't break everything \ 470 * if it does, use the first color instead \ 471 */ \ 472 if (idx == (uint8_t)-1) { \ 473 idx = 0; \ 474 } \ 475 while (rep >= 0) { \ 476 *buf++ = idx; \ 477 rep--; \ 478 } \ 479 } \ 480 } 481 482 DEFINE_IDX_ENCODE_FUNCTION(16) 483 DEFINE_IDX_ENCODE_FUNCTION(32) 484 485 #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ 486 \ 487 static void \ 488 tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ 489 uint##bpp##_t bg, uint##bpp##_t fg) { \ 490 uint##bpp##_t *ptr; \ 491 unsigned int value, mask; \ 492 int aligned_width; \ 493 int x, y, bg_bits; \ 494 \ 495 ptr = (uint##bpp##_t *) buf; \ 496 aligned_width = w - w % 8; \ 497 \ 498 for (y = 0; y < h; y++) { \ 499 for (x = 0; x < aligned_width; x += 8) { \ 500 for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ 501 if (*ptr++ != bg) { \ 502 break; \ 503 } \ 504 } \ 505 if (bg_bits == 8) { \ 506 *buf++ = 0; \ 507 continue; \ 508 } \ 509 mask = 0x80 >> bg_bits; \ 510 value = mask; \ 511 for (bg_bits++; bg_bits < 8; bg_bits++) { \ 512 mask >>= 1; \ 513 if (*ptr++ != bg) { \ 514 value |= mask; \ 515 } \ 516 } \ 517 *buf++ = (uint8_t)value; \ 518 } \ 519 \ 520 mask = 0x80; \ 521 value = 0; \ 522 if (x >= w) { \ 523 continue; \ 524 } \ 525 \ 526 for (; x < w; x++) { \ 527 if (*ptr++ != bg) { \ 528 value |= mask; \ 529 } \ 530 mask >>= 1; \ 531 } \ 532 *buf++ = (uint8_t)value; \ 533 } \ 534 } 535 536 DEFINE_MONO_ENCODE_FUNCTION(8) 537 DEFINE_MONO_ENCODE_FUNCTION(16) 538 DEFINE_MONO_ENCODE_FUNCTION(32) 539 540 /* 541 * ``Gradient'' filter for 24-bit color samples. 542 * Should be called only when redMax, greenMax and blueMax are 255. 543 * Color components assumed to be byte-aligned. 544 */ 545 546 static void 547 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h) 548 { 549 uint32_t *buf32; 550 uint32_t pix32; 551 int shift[3]; 552 int *prev; 553 int here[3], upper[3], left[3], upperleft[3]; 554 int prediction; 555 int x, y, c; 556 557 buf32 = (uint32_t *)buf; 558 memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); 559 560 if (1 /* FIXME: (vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 561 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG) */) { 562 shift[0] = vs->client_pf.rshift; 563 shift[1] = vs->client_pf.gshift; 564 shift[2] = vs->client_pf.bshift; 565 } else { 566 shift[0] = 24 - vs->client_pf.rshift; 567 shift[1] = 24 - vs->client_pf.gshift; 568 shift[2] = 24 - vs->client_pf.bshift; 569 } 570 571 for (y = 0; y < h; y++) { 572 for (c = 0; c < 3; c++) { 573 upper[c] = 0; 574 here[c] = 0; 575 } 576 prev = (int *)vs->tight.gradient.buffer; 577 for (x = 0; x < w; x++) { 578 pix32 = *buf32++; 579 for (c = 0; c < 3; c++) { 580 upperleft[c] = upper[c]; 581 left[c] = here[c]; 582 upper[c] = *prev; 583 here[c] = (int)(pix32 >> shift[c] & 0xFF); 584 *prev++ = here[c]; 585 586 prediction = left[c] + upper[c] - upperleft[c]; 587 if (prediction < 0) { 588 prediction = 0; 589 } else if (prediction > 0xFF) { 590 prediction = 0xFF; 591 } 592 *buf++ = (char)(here[c] - prediction); 593 } 594 } 595 } 596 } 597 598 599 /* 600 * ``Gradient'' filter for other color depths. 601 */ 602 603 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp) \ 604 \ 605 static void \ 606 tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf, \ 607 int w, int h) { \ 608 uint##bpp##_t pix, diff; \ 609 bool endian; \ 610 int *prev; \ 611 int max[3], shift[3]; \ 612 int here[3], upper[3], left[3], upperleft[3]; \ 613 int prediction; \ 614 int x, y, c; \ 615 \ 616 memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int)); \ 617 \ 618 endian = 0; /* FIXME: ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) != \ 619 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)); */ \ 620 \ 621 max[0] = vs->client_pf.rmax; \ 622 max[1] = vs->client_pf.gmax; \ 623 max[2] = vs->client_pf.bmax; \ 624 shift[0] = vs->client_pf.rshift; \ 625 shift[1] = vs->client_pf.gshift; \ 626 shift[2] = vs->client_pf.bshift; \ 627 \ 628 for (y = 0; y < h; y++) { \ 629 for (c = 0; c < 3; c++) { \ 630 upper[c] = 0; \ 631 here[c] = 0; \ 632 } \ 633 prev = (int *)vs->tight.gradient.buffer; \ 634 for (x = 0; x < w; x++) { \ 635 pix = *buf; \ 636 if (endian) { \ 637 pix = bswap##bpp(pix); \ 638 } \ 639 diff = 0; \ 640 for (c = 0; c < 3; c++) { \ 641 upperleft[c] = upper[c]; \ 642 left[c] = here[c]; \ 643 upper[c] = *prev; \ 644 here[c] = (int)(pix >> shift[c] & max[c]); \ 645 *prev++ = here[c]; \ 646 \ 647 prediction = left[c] + upper[c] - upperleft[c]; \ 648 if (prediction < 0) { \ 649 prediction = 0; \ 650 } else if (prediction > max[c]) { \ 651 prediction = max[c]; \ 652 } \ 653 diff |= ((here[c] - prediction) & max[c]) \ 654 << shift[c]; \ 655 } \ 656 if (endian) { \ 657 diff = bswap##bpp(diff); \ 658 } \ 659 *buf++ = diff; \ 660 } \ 661 } \ 662 } 663 664 DEFINE_GRADIENT_FILTER_FUNCTION(16) 665 DEFINE_GRADIENT_FILTER_FUNCTION(32) 666 667 /* 668 * Check if a rectangle is all of the same color. If needSameColor is 669 * set to non-zero, then also check that its color equals to the 670 * *colorPtr value. The result is 1 if the test is successful, and in 671 * that case new color will be stored in *colorPtr. 672 */ 673 674 static bool 675 check_solid_tile32(VncState *vs, int x, int y, int w, int h, 676 uint32_t *color, bool samecolor) 677 { 678 VncDisplay *vd = vs->vd; 679 uint32_t *fbptr; 680 uint32_t c; 681 int dx, dy; 682 683 fbptr = vnc_server_fb_ptr(vd, x, y); 684 685 c = *fbptr; 686 if (samecolor && (uint32_t)c != *color) { 687 return false; 688 } 689 690 for (dy = 0; dy < h; dy++) { 691 for (dx = 0; dx < w; dx++) { 692 if (c != fbptr[dx]) { 693 return false; 694 } 695 } 696 fbptr = (uint32_t *) 697 ((uint8_t *)fbptr + vnc_server_fb_stride(vd)); 698 } 699 700 *color = (uint32_t)c; 701 return true; 702 } 703 704 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, 705 uint32_t* color, bool samecolor) 706 { 707 switch (VNC_SERVER_FB_BYTES) { 708 case 4: 709 return check_solid_tile32(vs, x, y, w, h, color, samecolor); 710 } 711 } 712 713 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, 714 uint32_t color, int *w_ptr, int *h_ptr) 715 { 716 int dx, dy, dw, dh; 717 int w_prev; 718 int w_best = 0, h_best = 0; 719 720 w_prev = w; 721 722 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 723 724 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); 725 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); 726 727 if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { 728 break; 729 } 730 731 for (dx = x + dw; dx < x + w_prev;) { 732 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); 733 734 if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { 735 break; 736 } 737 dx += dw; 738 } 739 740 w_prev = dx - x; 741 if (w_prev * (dy + dh - y) > w_best * h_best) { 742 w_best = w_prev; 743 h_best = dy + dh - y; 744 } 745 } 746 747 *w_ptr = w_best; 748 *h_ptr = h_best; 749 } 750 751 static void extend_solid_area(VncState *vs, int x, int y, int w, int h, 752 uint32_t color, int *x_ptr, int *y_ptr, 753 int *w_ptr, int *h_ptr) 754 { 755 int cx, cy; 756 757 /* Try to extend the area upwards. */ 758 for ( cy = *y_ptr - 1; 759 cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 760 cy-- ); 761 *h_ptr += *y_ptr - (cy + 1); 762 *y_ptr = cy + 1; 763 764 /* ... downwards. */ 765 for ( cy = *y_ptr + *h_ptr; 766 cy < y + h && 767 check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); 768 cy++ ); 769 *h_ptr += cy - (*y_ptr + *h_ptr); 770 771 /* ... to the left. */ 772 for ( cx = *x_ptr - 1; 773 cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 774 cx-- ); 775 *w_ptr += *x_ptr - (cx + 1); 776 *x_ptr = cx + 1; 777 778 /* ... to the right. */ 779 for ( cx = *x_ptr + *w_ptr; 780 cx < x + w && 781 check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); 782 cx++ ); 783 *w_ptr += cx - (*x_ptr + *w_ptr); 784 } 785 786 static int tight_init_stream(VncState *vs, int stream_id, 787 int level, int strategy) 788 { 789 z_streamp zstream = &vs->tight.stream[stream_id]; 790 791 if (zstream->opaque == NULL) { 792 int err; 793 794 VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); 795 VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); 796 zstream->zalloc = vnc_zlib_zalloc; 797 zstream->zfree = vnc_zlib_zfree; 798 799 err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, 800 MAX_MEM_LEVEL, strategy); 801 802 if (err != Z_OK) { 803 fprintf(stderr, "VNC: error initializing zlib\n"); 804 return -1; 805 } 806 807 vs->tight.levels[stream_id] = level; 808 zstream->opaque = vs; 809 } 810 811 if (vs->tight.levels[stream_id] != level) { 812 if (deflateParams(zstream, level, strategy) != Z_OK) { 813 return -1; 814 } 815 vs->tight.levels[stream_id] = level; 816 } 817 return 0; 818 } 819 820 static void tight_send_compact_size(VncState *vs, size_t len) 821 { 822 int lpc = 0; 823 int bytes = 0; 824 char buf[3] = {0, 0, 0}; 825 826 buf[bytes++] = len & 0x7F; 827 if (len > 0x7F) { 828 buf[bytes-1] |= 0x80; 829 buf[bytes++] = (len >> 7) & 0x7F; 830 if (len > 0x3FFF) { 831 buf[bytes-1] |= 0x80; 832 buf[bytes++] = (len >> 14) & 0xFF; 833 } 834 } 835 for (lpc = 0; lpc < bytes; lpc++) { 836 vnc_write_u8(vs, buf[lpc]); 837 } 838 } 839 840 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, 841 int level, int strategy) 842 { 843 z_streamp zstream = &vs->tight.stream[stream_id]; 844 int previous_out; 845 846 if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { 847 vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset); 848 return bytes; 849 } 850 851 if (tight_init_stream(vs, stream_id, level, strategy)) { 852 return -1; 853 } 854 855 /* reserve memory in output buffer */ 856 buffer_reserve(&vs->tight.zlib, bytes + 64); 857 858 /* set pointers */ 859 zstream->next_in = vs->tight.tight.buffer; 860 zstream->avail_in = vs->tight.tight.offset; 861 zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset; 862 zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset; 863 previous_out = zstream->avail_out; 864 zstream->data_type = Z_BINARY; 865 866 /* start encoding */ 867 if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { 868 fprintf(stderr, "VNC: error during tight compression\n"); 869 return -1; 870 } 871 872 vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out; 873 /* ...how much data has actually been produced by deflate() */ 874 bytes = previous_out - zstream->avail_out; 875 876 tight_send_compact_size(vs, bytes); 877 vnc_write(vs, vs->tight.zlib.buffer, bytes); 878 879 buffer_reset(&vs->tight.zlib); 880 881 return bytes; 882 } 883 884 /* 885 * Subencoding implementations. 886 */ 887 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) 888 { 889 uint32_t *buf32; 890 uint32_t pix; 891 int rshift, gshift, bshift; 892 893 buf32 = (uint32_t *)buf; 894 895 if (1 /* FIXME: (vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == 896 (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG) */) { 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 int send_sub_rect(VncState *vs, int x, int y, int w, int h) 1460 { 1461 VncPalette *palette = NULL; 1462 uint32_t bg = 0, fg = 0; 1463 int colors; 1464 int ret = 0; 1465 #ifdef CONFIG_VNC_JPEG 1466 bool force_jpeg = false; 1467 bool allow_jpeg = true; 1468 #endif 1469 1470 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1471 1472 vnc_tight_start(vs); 1473 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1474 vnc_tight_stop(vs); 1475 1476 #ifdef CONFIG_VNC_JPEG 1477 if (!vs->vd->non_adaptive && vs->tight.quality != (uint8_t)-1) { 1478 double freq = vnc_update_freq(vs, x, y, w, h); 1479 1480 if (freq < tight_jpeg_conf[vs->tight.quality].jpeg_freq_min) { 1481 allow_jpeg = false; 1482 } 1483 if (freq >= tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1484 force_jpeg = true; 1485 vnc_sent_lossy_rect(vs, x, y, w, h); 1486 } 1487 } 1488 #endif 1489 1490 colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette); 1491 1492 #ifdef CONFIG_VNC_JPEG 1493 if (allow_jpeg && vs->tight.quality != (uint8_t)-1) { 1494 ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette, 1495 force_jpeg); 1496 } else { 1497 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1498 } 1499 #else 1500 ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette); 1501 #endif 1502 1503 palette_destroy(palette); 1504 return ret; 1505 } 1506 1507 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) 1508 { 1509 vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type); 1510 1511 vnc_tight_start(vs); 1512 vnc_raw_send_framebuffer_update(vs, x, y, w, h); 1513 vnc_tight_stop(vs); 1514 1515 return send_solid_rect(vs); 1516 } 1517 1518 static int send_rect_simple(VncState *vs, int x, int y, int w, int h, 1519 bool split) 1520 { 1521 int max_size, max_width; 1522 int max_sub_width, max_sub_height; 1523 int dx, dy; 1524 int rw, rh; 1525 int n = 0; 1526 1527 max_size = tight_conf[vs->tight.compression].max_rect_size; 1528 max_width = tight_conf[vs->tight.compression].max_rect_width; 1529 1530 if (split && (w > max_width || w * h > max_size)) { 1531 max_sub_width = (w > max_width) ? max_width : w; 1532 max_sub_height = max_size / max_sub_width; 1533 1534 for (dy = 0; dy < h; dy += max_sub_height) { 1535 for (dx = 0; dx < w; dx += max_width) { 1536 rw = MIN(max_sub_width, w - dx); 1537 rh = MIN(max_sub_height, h - dy); 1538 n += send_sub_rect(vs, x+dx, y+dy, rw, rh); 1539 } 1540 } 1541 } else { 1542 n += send_sub_rect(vs, x, y, w, h); 1543 } 1544 1545 return n; 1546 } 1547 1548 static int find_large_solid_color_rect(VncState *vs, int x, int y, 1549 int w, int h, int max_rows) 1550 { 1551 int dx, dy, dw, dh; 1552 int n = 0; 1553 1554 /* Try to find large solid-color areas and send them separately. */ 1555 1556 for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1557 1558 /* If a rectangle becomes too large, send its upper part now. */ 1559 1560 if (dy - y >= max_rows) { 1561 n += send_rect_simple(vs, x, y, w, max_rows, true); 1562 y += max_rows; 1563 h -= max_rows; 1564 } 1565 1566 dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); 1567 1568 for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { 1569 uint32_t color_value; 1570 int x_best, y_best, w_best, h_best; 1571 1572 dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); 1573 1574 if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { 1575 continue ; 1576 } 1577 1578 /* Get dimensions of solid-color area. */ 1579 1580 find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), 1581 color_value, &w_best, &h_best); 1582 1583 /* Make sure a solid rectangle is large enough 1584 (or the whole rectangle is of the same color). */ 1585 1586 if (w_best * h_best != w * h && 1587 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { 1588 continue; 1589 } 1590 1591 /* Try to extend solid rectangle to maximum size. */ 1592 1593 x_best = dx; y_best = dy; 1594 extend_solid_area(vs, x, y, w, h, color_value, 1595 &x_best, &y_best, &w_best, &h_best); 1596 1597 /* Send rectangles at top and left to solid-color area. */ 1598 1599 if (y_best != y) { 1600 n += send_rect_simple(vs, x, y, w, y_best-y, true); 1601 } 1602 if (x_best != x) { 1603 n += tight_send_framebuffer_update(vs, x, y_best, 1604 x_best-x, h_best); 1605 } 1606 1607 /* Send solid-color rectangle. */ 1608 n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); 1609 1610 /* Send remaining rectangles (at right and bottom). */ 1611 1612 if (x_best + w_best != x + w) { 1613 n += tight_send_framebuffer_update(vs, x_best+w_best, 1614 y_best, 1615 w-(x_best-x)-w_best, 1616 h_best); 1617 } 1618 if (y_best + h_best != y + h) { 1619 n += tight_send_framebuffer_update(vs, x, y_best+h_best, 1620 w, h-(y_best-y)-h_best); 1621 } 1622 1623 /* Return after all recursive calls are done. */ 1624 return n; 1625 } 1626 } 1627 return n + send_rect_simple(vs, x, y, w, h, true); 1628 } 1629 1630 static int tight_send_framebuffer_update(VncState *vs, int x, int y, 1631 int w, int h) 1632 { 1633 int max_rows; 1634 1635 if (vs->client_pf.bytes_per_pixel == 4 && vs->client_pf.rmax == 0xFF && 1636 vs->client_pf.bmax == 0xFF && vs->client_pf.gmax == 0xFF) { 1637 vs->tight.pixel24 = true; 1638 } else { 1639 vs->tight.pixel24 = false; 1640 } 1641 1642 #ifdef CONFIG_VNC_JPEG 1643 if (vs->tight.quality != (uint8_t)-1) { 1644 double freq = vnc_update_freq(vs, x, y, w, h); 1645 1646 if (freq > tight_jpeg_conf[vs->tight.quality].jpeg_freq_threshold) { 1647 return send_rect_simple(vs, x, y, w, h, false); 1648 } 1649 } 1650 #endif 1651 1652 if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) { 1653 return send_rect_simple(vs, x, y, w, h, true); 1654 } 1655 1656 /* Calculate maximum number of rows in one non-solid rectangle. */ 1657 1658 max_rows = tight_conf[vs->tight.compression].max_rect_size; 1659 max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w); 1660 1661 return find_large_solid_color_rect(vs, x, y, w, h, max_rows); 1662 } 1663 1664 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, 1665 int w, int h) 1666 { 1667 vs->tight.type = VNC_ENCODING_TIGHT; 1668 return tight_send_framebuffer_update(vs, x, y, w, h); 1669 } 1670 1671 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 1672 int w, int h) 1673 { 1674 vs->tight.type = VNC_ENCODING_TIGHT_PNG; 1675 return tight_send_framebuffer_update(vs, x, y, w, h); 1676 } 1677 1678 void vnc_tight_clear(VncState *vs) 1679 { 1680 int i; 1681 for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) { 1682 if (vs->tight.stream[i].opaque) { 1683 deflateEnd(&vs->tight.stream[i]); 1684 } 1685 } 1686 1687 buffer_free(&vs->tight.tight); 1688 buffer_free(&vs->tight.zlib); 1689 buffer_free(&vs->tight.gradient); 1690 #ifdef CONFIG_VNC_JPEG 1691 buffer_free(&vs->tight.jpeg); 1692 #endif 1693 #ifdef CONFIG_VNC_PNG 1694 buffer_free(&vs->tight.png); 1695 #endif 1696 } 1697