ui/vnc-enc-tight.c

   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 #ifdef CONFIG_VNC_PNG
  32 #include <png.h>
  33 #endif
  34 #ifdef CONFIG_VNC_JPEG
  35 #include <stdio.h>
  36 #include <jpeglib.h>
  37 #endif
  38
  39 #include "qemu-common.h"
  40
  41 #include "bswap.h"
  42 #include "qint.h"
  43 #include "vnc.h"
  44 #include "vnc-enc-tight.h"
  45 #include "vnc-palette.h"
  46
  47 /* Compression level stuff. The following array contains various
  48    encoder parameters for each of 10 compression levels (0..9).
  49    Last three parameters correspond to JPEG quality levels (0..9). */
  50
  51 static const struct {
  52     int max_rect_size, max_rect_width;
  53     int mono_min_rect_size, gradient_min_rect_size;
  54     int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level;
  55     int gradient_threshold, gradient_threshold24;
  56     int idx_max_colors_divisor;
  57     int jpeg_quality, jpeg_threshold, jpeg_threshold24;
  58 } tight_conf[] = {
  59     {   512,   32,   6, 65536, 0, 0, 0, 0,   0,   0,   4,  5, 10000, 23000 },
  60     {  2048,  128,   6, 65536, 1, 1, 1, 0,   0,   0,   8, 10,  8000, 18000 },
  61     {  6144,  256,   8, 65536, 3, 3, 2, 0,   0,   0,  24, 15,  6500, 15000 },
  62     { 10240, 1024,  12, 65536, 5, 5, 3, 0,   0,   0,  32, 25,  5000, 12000 },
  63     { 16384, 2048,  12, 65536, 6, 6, 4, 0,   0,   0,  32, 37,  4000, 10000 },
  64     { 32768, 2048,  12,  4096, 7, 7, 5, 4, 150, 380,  32, 50,  3000,  8000 },
  65     { 65536, 2048,  16,  4096, 7, 7, 6, 4, 170, 420,  48, 60,  2000,  5000 },
  66     { 65536, 2048,  16,  4096, 8, 8, 7, 5, 180, 450,  64, 70,  1000,  2500 },
  67     { 65536, 2048,  32,  8192, 9, 9, 8, 6, 190, 475,  64, 75,   500,  1200 },
  68     { 65536, 2048,  32,  8192, 9, 9, 9, 6, 200, 500,  96, 80,   200,   500 }
  69 };
  70
  71
  72 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
  73                                          int w, int h);
  74
  75 #ifdef CONFIG_VNC_PNG
  76 static const struct {
  77     int png_zlib_level, png_filters;
  78 } tight_png_conf[] = {
  79     { 0, PNG_NO_FILTERS },
  80     { 1, PNG_NO_FILTERS },
  81     { 2, PNG_NO_FILTERS },
  82     { 3, PNG_NO_FILTERS },
  83     { 4, PNG_NO_FILTERS },
  84     { 5, PNG_ALL_FILTERS },
  85     { 6, PNG_ALL_FILTERS },
  86     { 7, PNG_ALL_FILTERS },
  87     { 8, PNG_ALL_FILTERS },
  88     { 9, PNG_ALL_FILTERS },
  89 };
  90
  91 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
  92                          VncPalette *palette);
  93
  94 static bool tight_can_send_png_rect(VncState *vs, int w, int h)
  95 {
  96     if (vs->tight.type != VNC_ENCODING_TIGHT_PNG) {
  97         return false;
  98     }
  99
 100     if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
 101         vs->clientds.pf.bytes_per_pixel == 1) {
 102         return false;
 103     }
 104
 105     return true;
 106 }
 107 #endif
 108
 109 /*
 110  * Code to guess if given rectangle is suitable for smooth image
 111  * compression (by applying "gradient" filter or JPEG coder).
 112  */
 113
 114 static unsigned int
 115 tight_detect_smooth_image24(VncState *vs, int w, int h)
 116 {
 117     int off;
 118     int x, y, d, dx;
 119     unsigned int c;
 120     unsigned int stats[256];
 121     int pixels = 0;
 122     int pix, left[3];
 123     unsigned int errors;
 124     unsigned char *buf = vs->tight.tight.buffer;
 125
 126     /*
 127      * If client is big-endian, color samples begin from the second
 128      * byte (offset 1) of a 32-bit pixel value.
 129      */
 130     off = !!(vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG);
 131
 132     memset(stats, 0, sizeof (stats));
 133
 134     for (y = 0, x = 0; y < h && x < w;) {
 135         for (d = 0; d < h - y && d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH;
 136              d++) {
 137             for (c = 0; c < 3; c++) {
 138                 left[c] = buf[((y+d)*w+x+d)*4+off+c] & 0xFF;
 139             }
 140             for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH; dx++) {
 141                 for (c = 0; c < 3; c++) {
 142                     pix = buf[((y+d)*w+x+d+dx)*4+off+c] & 0xFF;
 143                     stats[abs(pix - left[c])]++;
 144                     left[c] = pix;
 145                 }
 146                 pixels++;
 147             }
 148         }
 149         if (w > h) {
 150             x += h;
 151             y = 0;
 152         } else {
 153             x = 0;
 154             y += w;
 155         }
 156     }
 157
 158     /* 95% smooth or more ... */
 159     if (stats[0] * 33 / pixels >= 95) {
 160         return 0;
 161     }
 162
 163     errors = 0;
 164     for (c = 1; c < 8; c++) {
 165         errors += stats[c] * (c * c);
 166         if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {
 167             return 0;
 168         }
 169     }
 170     for (; c < 256; c++) {
 171         errors += stats[c] * (c * c);
 172     }
 173     errors /= (pixels * 3 - stats[0]);
 174
 175     return errors;
 176 }
 177
 178 #define DEFINE_DETECT_FUNCTION(bpp)                                     \
 179                                                                         \
 180     static unsigned int                                                 \
 181     tight_detect_smooth_image##bpp(VncState *vs, int w, int h) {        \
 182         bool endian;                                                    \
 183         uint##bpp##_t pix;                                              \
 184         int max[3], shift[3];                                           \
 185         int x, y, d, dx;                                                \
 186         unsigned int c;                                                 \
 187         unsigned int stats[256];                                        \
 188         int pixels = 0;                                                 \
 189         int sample, sum, left[3];                                       \
 190         unsigned int errors;                                            \
 191         unsigned char *buf = vs->tight.tight.buffer;                    \
 192                                                                         \
 193         endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) !=        \
 194                   (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG));     \
 195                                                                         \
 196                                                                         \
 197         max[0] = vs->clientds.pf.rmax;                                  \
 198         max[1] = vs->clientds.pf.gmax;                                  \
 199         max[2] = vs->clientds.pf.bmax;                                  \
 200         shift[0] = vs->clientds.pf.rshift;                              \
 201         shift[1] = vs->clientds.pf.gshift;                              \
 202         shift[2] = vs->clientds.pf.bshift;                              \
 203                                                                         \
 204         memset(stats, 0, sizeof(stats));                                \
 205                                                                         \
 206         y = 0, x = 0;                                                   \
 207         while (y < h && x < w) {                                        \
 208             for (d = 0; d < h - y &&                                    \
 209                      d < w - x - VNC_TIGHT_DETECT_SUBROW_WIDTH; d++) {  \
 210                 pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d];              \
 211                 if (endian) {                                           \
 212                     pix = bswap##bpp(pix);                              \
 213                 }                                                       \
 214                 for (c = 0; c < 3; c++) {                               \
 215                     left[c] = (int)(pix >> shift[c] & max[c]);          \
 216                 }                                                       \
 217                 for (dx = 1; dx <= VNC_TIGHT_DETECT_SUBROW_WIDTH;       \
 218                      dx++) {                                            \
 219                     pix = ((uint##bpp##_t *)buf)[(y+d)*w+x+d+dx];       \
 220                     if (endian) {                                       \
 221                         pix = bswap##bpp(pix);                          \
 222                     }                                                   \
 223                     sum = 0;                                            \
 224                     for (c = 0; c < 3; c++) {                           \
 225                         sample = (int)(pix >> shift[c] & max[c]);       \
 226                         sum += abs(sample - left[c]);                   \
 227                         left[c] = sample;                               \
 228                     }                                                   \
 229                     if (sum > 255) {                                    \
 230                         sum = 255;                                      \
 231                     }                                                   \
 232                     stats[sum]++;                                       \
 233                     pixels++;                                           \
 234                 }                                                       \
 235             }                                                           \
 236             if (w > h) {                                                \
 237                 x += h;                                                 \
 238                 y = 0;                                                  \
 239             } else {                                                    \
 240                 x = 0;                                                  \
 241                 y += w;                                                 \
 242             }                                                           \
 243         }                                                               \
 244                                                                         \
 245         if ((stats[0] + stats[1]) * 100 / pixels >= 90) {               \
 246             return 0;                                                   \
 247         }                                                               \
 248                                                                         \
 249         errors = 0;                                                     \
 250         for (c = 1; c < 8; c++) {                                       \
 251             errors += stats[c] * (c * c);                               \
 252             if (stats[c] == 0 || stats[c] > stats[c-1] * 2) {           \
 253                 return 0;                                               \
 254             }                                                           \
 255         }                                                               \
 256         for (; c < 256; c++) {                                          \
 257             errors += stats[c] * (c * c);                               \
 258         }                                                               \
 259         errors /= (pixels - stats[0]);                                  \
 260                                                                         \
 261         return errors;                                                  \
 262     }
 263
 264 DEFINE_DETECT_FUNCTION(16)
 265 DEFINE_DETECT_FUNCTION(32)
 266
 267 static int
 268 tight_detect_smooth_image(VncState *vs, int w, int h)
 269 {
 270     unsigned int errors;
 271     int compression = vs->tight.compression;
 272     int quality = vs->tight.quality;
 273
 274     if (!vs->vd->lossy) {
 275         return 0;
 276     }
 277
 278     if (ds_get_bytes_per_pixel(vs->ds) == 1 ||
 279         vs->clientds.pf.bytes_per_pixel == 1 ||
 280         w < VNC_TIGHT_DETECT_MIN_WIDTH || h < VNC_TIGHT_DETECT_MIN_HEIGHT) {
 281         return 0;
 282     }
 283
 284     if (vs->tight.quality != (uint8_t)-1) {
 285         if (w * h < VNC_TIGHT_JPEG_MIN_RECT_SIZE) {
 286             return 0;
 287         }
 288     } else {
 289         if (w * h < tight_conf[compression].gradient_min_rect_size) {
 290             return 0;
 291         }
 292     }
 293
 294     if (vs->clientds.pf.bytes_per_pixel == 4) {
 295         if (vs->tight.pixel24) {
 296             errors = tight_detect_smooth_image24(vs, w, h);
 297             if (vs->tight.quality != (uint8_t)-1) {
 298                 return (errors < tight_conf[quality].jpeg_threshold24);
 299             }
 300             return (errors < tight_conf[compression].gradient_threshold24);
 301         } else {
 302             errors = tight_detect_smooth_image32(vs, w, h);
 303         }
 304     } else {
 305         errors = tight_detect_smooth_image16(vs, w, h);
 306     }
 307     if (quality != -1) {
 308         return (errors < tight_conf[quality].jpeg_threshold);
 309     }
 310     return (errors < tight_conf[compression].gradient_threshold);
 311 }
 312
 313 /*
 314  * Code to determine how many different colors used in rectangle.
 315  */
 316 #define DEFINE_FILL_PALETTE_FUNCTION(bpp)                               \
 317                                                                         \
 318     static int                                                          \
 319     tight_fill_palette##bpp(VncState *vs, int x, int y,                 \
 320                             int max, size_t count,                      \
 321                             uint32_t *bg, uint32_t *fg,                 \
 322                             VncPalette **palette) {                     \
 323         uint##bpp##_t *data;                                            \
 324         uint##bpp##_t c0, c1, ci;                                       \
 325         int i, n0, n1;                                                  \
 326                                                                         \
 327         data = (uint##bpp##_t *)vs->tight.tight.buffer;                 \
 328                                                                         \
 329         c0 = data[0];                                                   \
 330         i = 1;                                                          \
 331         while (i < count && data[i] == c0)                              \
 332             i++;                                                        \
 333         if (i >= count) {                                               \
 334             *bg = *fg = c0;                                             \
 335             return 1;                                                   \
 336         }                                                               \
 337                                                                         \
 338         if (max < 2) {                                                  \
 339             return 0;                                                   \
 340         }                                                               \
 341                                                                         \
 342         n0 = i;                                                         \
 343         c1 = data[i];                                                   \
 344         n1 = 0;                                                         \
 345         for (i++; i < count; i++) {                                     \
 346             ci = data[i];                                               \
 347             if (ci == c0) {                                             \
 348                 n0++;                                                   \
 349             } else if (ci == c1) {                                      \
 350                 n1++;                                                   \
 351             } else                                                      \
 352                 break;                                                  \
 353         }                                                               \
 354         if (i >= count) {                                               \
 355             if (n0 > n1) {                                              \
 356                 *bg = (uint32_t)c0;                                     \
 357                 *fg = (uint32_t)c1;                                     \
 358             } else {                                                    \
 359                 *bg = (uint32_t)c1;                                     \
 360                 *fg = (uint32_t)c0;                                     \
 361             }                                                           \
 362             return 2;                                                   \
 363         }                                                               \
 364                                                                         \
 365         if (max == 2) {                                                 \
 366             return 0;                                                   \
 367         }                                                               \
 368                                                                         \
 369         *palette = palette_new(max, bpp);                               \
 370         palette_put(*palette, c0);                                      \
 371         palette_put(*palette, c1);                                      \
 372         palette_put(*palette, ci);                                      \
 373                                                                         \
 374         for (i++; i < count; i++) {                                     \
 375             if (data[i] == ci) {                                        \
 376                 continue;                                               \
 377             } else {                                                    \
 378                 ci = data[i];                                           \
 379                 if (!palette_put(*palette, (uint32_t)ci)) {             \
 380                     return 0;                                           \
 381                 }                                                       \
 382             }                                                           \
 383         }                                                               \
 384                                                                         \
 385         return palette_size(*palette);                                  \
 386     }
 387
 388 DEFINE_FILL_PALETTE_FUNCTION(8)
 389 DEFINE_FILL_PALETTE_FUNCTION(16)
 390 DEFINE_FILL_PALETTE_FUNCTION(32)
 391
 392 static int tight_fill_palette(VncState *vs, int x, int y,
 393                               size_t count, uint32_t *bg, uint32_t *fg,
 394                               VncPalette **palette)
 395 {
 396     int max;
 397
 398     max = count / tight_conf[vs->tight.compression].idx_max_colors_divisor;
 399     if (max < 2 &&
 400         count >= tight_conf[vs->tight.compression].mono_min_rect_size) {
 401         max = 2;
 402     }
 403     if (max >= 256) {
 404         max = 256;
 405     }
 406
 407     switch(vs->clientds.pf.bytes_per_pixel) {
 408     case 4:
 409         return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette);
 410     case 2:
 411         return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette);
 412     default:
 413         max = 2;
 414         return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette);
 415     }
 416     return 0;
 417 }
 418
 419 /*
 420  * Converting truecolor samples into palette indices.
 421  */
 422 #define DEFINE_IDX_ENCODE_FUNCTION(bpp)                                 \
 423                                                                         \
 424     static void                                                         \
 425     tight_encode_indexed_rect##bpp(uint8_t *buf, int count,             \
 426                                    VncPalette *palette) {               \
 427         uint##bpp##_t *src;                                             \
 428         uint##bpp##_t rgb;                                              \
 429         int i, rep;                                                     \
 430         uint8_t idx;                                                    \
 431                                                                         \
 432         src = (uint##bpp##_t *) buf;                                    \
 433                                                                         \
 434         for (i = 0; i < count; i++) {                                   \
 435                                                                         \
 436             rgb = *src++;                                               \
 437             rep = 0;                                                    \
 438             while (i < count && *src == rgb) {                          \
 439                 rep++, src++, i++;                                      \
 440             }                                                           \
 441             idx = palette_idx(palette, rgb);                            \
 442             /*                                                          \
 443              * Should never happen, but don't break everything          \
 444              * if it does, use the first color instead                  \
 445              */                                                         \
 446             if (idx == (uint8_t)-1) {                                   \
 447                 idx = 0;                                                \
 448             }                                                           \
 449             while (rep >= 0) {                                          \
 450                 *buf++ = idx;                                           \
 451                 rep--;                                                  \
 452             }                                                           \
 453         }                                                               \
 454     }
 455
 456 DEFINE_IDX_ENCODE_FUNCTION(16)
 457 DEFINE_IDX_ENCODE_FUNCTION(32)
 458
 459 #define DEFINE_MONO_ENCODE_FUNCTION(bpp)                                \
 460                                                                         \
 461     static void                                                         \
 462     tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h,             \
 463                                 uint##bpp##_t bg, uint##bpp##_t fg) {   \
 464         uint##bpp##_t *ptr;                                             \
 465         unsigned int value, mask;                                       \
 466         int aligned_width;                                              \
 467         int x, y, bg_bits;                                              \
 468                                                                         \
 469         ptr = (uint##bpp##_t *) buf;                                    \
 470         aligned_width = w - w % 8;                                      \
 471                                                                         \
 472         for (y = 0; y < h; y++) {                                       \
 473             for (x = 0; x < aligned_width; x += 8) {                    \
 474                 for (bg_bits = 0; bg_bits < 8; bg_bits++) {             \
 475                     if (*ptr++ != bg) {                                 \
 476                         break;                                          \
 477                     }                                                   \
 478                 }                                                       \
 479                 if (bg_bits == 8) {                                     \
 480                     *buf++ = 0;                                         \
 481                     continue;                                           \
 482                 }                                                       \
 483                 mask = 0x80 >> bg_bits;                                 \
 484                 value = mask;                                           \
 485                 for (bg_bits++; bg_bits < 8; bg_bits++) {               \
 486                     mask >>= 1;                                         \
 487                     if (*ptr++ != bg) {                                 \
 488                         value |= mask;                                  \
 489                     }                                                   \
 490                 }                                                       \
 491                 *buf++ = (uint8_t)value;                                \
 492             }                                                           \
 493                                                                         \
 494             mask = 0x80;                                                \
 495             value = 0;                                                  \
 496             if (x >= w) {                                               \
 497                 continue;                                               \
 498             }                                                           \
 499                                                                         \
 500             for (; x < w; x++) {                                        \
 501                 if (*ptr++ != bg) {                                     \
 502                     value |= mask;                                      \
 503                 }                                                       \
 504                 mask >>= 1;                                             \
 505             }                                                           \
 506             *buf++ = (uint8_t)value;                                    \
 507         }                                                               \
 508     }
 509
 510 DEFINE_MONO_ENCODE_FUNCTION(8)
 511 DEFINE_MONO_ENCODE_FUNCTION(16)
 512 DEFINE_MONO_ENCODE_FUNCTION(32)
 513
 514 /*
 515  * ``Gradient'' filter for 24-bit color samples.
 516  * Should be called only when redMax, greenMax and blueMax are 255.
 517  * Color components assumed to be byte-aligned.
 518  */
 519
 520 static void
 521 tight_filter_gradient24(VncState *vs, uint8_t *buf, int w, int h)
 522 {
 523     uint32_t *buf32;
 524     uint32_t pix32;
 525     int shift[3];
 526     int *prev;
 527     int here[3], upper[3], left[3], upperleft[3];
 528     int prediction;
 529     int x, y, c;
 530
 531     buf32 = (uint32_t *)buf;
 532     memset(vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));
 533
 534     if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
 535         (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
 536         shift[0] = vs->clientds.pf.rshift;
 537         shift[1] = vs->clientds.pf.gshift;
 538         shift[2] = vs->clientds.pf.bshift;
 539     } else {
 540         shift[0] = 24 - vs->clientds.pf.rshift;
 541         shift[1] = 24 - vs->clientds.pf.gshift;
 542         shift[2] = 24 - vs->clientds.pf.bshift;
 543     }
 544
 545     for (y = 0; y < h; y++) {
 546         for (c = 0; c < 3; c++) {
 547             upper[c] = 0;
 548             here[c] = 0;
 549         }
 550         prev = (int *)vs->tight.gradient.buffer;
 551         for (x = 0; x < w; x++) {
 552             pix32 = *buf32++;
 553             for (c = 0; c < 3; c++) {
 554                 upperleft[c] = upper[c];
 555                 left[c] = here[c];
 556                 upper[c] = *prev;
 557                 here[c] = (int)(pix32 >> shift[c] & 0xFF);
 558                 *prev++ = here[c];
 559
 560                 prediction = left[c] + upper[c] - upperleft[c];
 561                 if (prediction < 0) {
 562                     prediction = 0;
 563                 } else if (prediction > 0xFF) {
 564                     prediction = 0xFF;
 565                 }
 566                 *buf++ = (char)(here[c] - prediction);
 567             }
 568         }
 569     }
 570 }
 571
 572
 573 /*
 574  * ``Gradient'' filter for other color depths.
 575  */
 576
 577 #define DEFINE_GRADIENT_FILTER_FUNCTION(bpp)                            \
 578                                                                         \
 579     static void                                                         \
 580     tight_filter_gradient##bpp(VncState *vs, uint##bpp##_t *buf,        \
 581                                int w, int h) {                          \
 582         uint##bpp##_t pix, diff;                                        \
 583         bool endian;                                                    \
 584         int *prev;                                                      \
 585         int max[3], shift[3];                                           \
 586         int here[3], upper[3], left[3], upperleft[3];                   \
 587         int prediction;                                                 \
 588         int x, y, c;                                                    \
 589                                                                         \
 590         memset (vs->tight.gradient.buffer, 0, w * 3 * sizeof(int));     \
 591                                                                         \
 592         endian = ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) !=        \
 593                   (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG));     \
 594                                                                         \
 595         max[0] = vs->clientds.pf.rmax;                                  \
 596         max[1] = vs->clientds.pf.gmax;                                  \
 597         max[2] = vs->clientds.pf.bmax;                                  \
 598         shift[0] = vs->clientds.pf.rshift;                              \
 599         shift[1] = vs->clientds.pf.gshift;                              \
 600         shift[2] = vs->clientds.pf.bshift;                              \
 601                                                                         \
 602         for (y = 0; y < h; y++) {                                       \
 603             for (c = 0; c < 3; c++) {                                   \
 604                 upper[c] = 0;                                           \
 605                 here[c] = 0;                                            \
 606             }                                                           \
 607             prev = (int *)vs->tight.gradient.buffer;                    \
 608             for (x = 0; x < w; x++) {                                   \
 609                 pix = *buf;                                             \
 610                 if (endian) {                                           \
 611                     pix = bswap##bpp(pix);                              \
 612                 }                                                       \
 613                 diff = 0;                                               \
 614                 for (c = 0; c < 3; c++) {                               \
 615                     upperleft[c] = upper[c];                            \
 616                     left[c] = here[c];                                  \
 617                     upper[c] = *prev;                                   \
 618                     here[c] = (int)(pix >> shift[c] & max[c]);          \
 619                     *prev++ = here[c];                                  \
 620                                                                         \
 621                     prediction = left[c] + upper[c] - upperleft[c];     \
 622                     if (prediction < 0) {                               \
 623                         prediction = 0;                                 \
 624                     } else if (prediction > max[c]) {                   \
 625                         prediction = max[c];                            \
 626                     }                                                   \
 627                     diff |= ((here[c] - prediction) & max[c])           \
 628                         << shift[c];                                    \
 629                 }                                                       \
 630                 if (endian) {                                           \
 631                     diff = bswap##bpp(diff);                            \
 632                 }                                                       \
 633                 *buf++ = diff;                                          \
 634             }                                                           \
 635         }                                                               \
 636     }
 637
 638 DEFINE_GRADIENT_FILTER_FUNCTION(16)
 639 DEFINE_GRADIENT_FILTER_FUNCTION(32)
 640
 641 /*
 642  * Check if a rectangle is all of the same color. If needSameColor is
 643  * set to non-zero, then also check that its color equals to the
 644  * *colorPtr value. The result is 1 if the test is successful, and in
 645  * that case new color will be stored in *colorPtr.
 646  */
 647
 648 #define DEFINE_CHECK_SOLID_FUNCTION(bpp)                                \
 649                                                                         \
 650     static bool                                                         \
 651     check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h,     \
 652                           uint32_t* color, bool samecolor)              \
 653     {                                                                   \
 654         VncDisplay *vd = vs->vd;                                        \
 655         uint##bpp##_t *fbptr;                                           \
 656         uint##bpp##_t c;                                                \
 657         int dx, dy;                                                     \
 658                                                                         \
 659         fbptr = (uint##bpp##_t *)                                       \
 660             (vd->server->data + y * ds_get_linesize(vs->ds) +           \
 661              x * ds_get_bytes_per_pixel(vs->ds));                       \
 662                                                                         \
 663         c = *fbptr;                                                     \
 664         if (samecolor && (uint32_t)c != *color) {                       \
 665             return false;                                               \
 666         }                                                               \
 667                                                                         \
 668         for (dy = 0; dy < h; dy++) {                                    \
 669             for (dx = 0; dx < w; dx++) {                                \
 670                 if (c != fbptr[dx]) {                                   \
 671                     return false;                                       \
 672                 }                                                       \
 673             }                                                           \
 674             fbptr = (uint##bpp##_t *)                                   \
 675                 ((uint8_t *)fbptr + ds_get_linesize(vs->ds));           \
 676         }                                                               \
 677                                                                         \
 678         *color = (uint32_t)c;                                           \
 679         return true;                                                    \
 680     }
 681
 682 DEFINE_CHECK_SOLID_FUNCTION(32)
 683 DEFINE_CHECK_SOLID_FUNCTION(16)
 684 DEFINE_CHECK_SOLID_FUNCTION(8)
 685
 686 static bool check_solid_tile(VncState *vs, int x, int y, int w, int h,
 687                              uint32_t* color, bool samecolor)
 688 {
 689     VncDisplay *vd = vs->vd;
 690
 691     switch(vd->server->pf.bytes_per_pixel) {
 692     case 4:
 693         return check_solid_tile32(vs, x, y, w, h, color, samecolor);
 694     case 2:
 695         return check_solid_tile16(vs, x, y, w, h, color, samecolor);
 696     default:
 697         return check_solid_tile8(vs, x, y, w, h, color, samecolor);
 698     }
 699 }
 700
 701 static void find_best_solid_area(VncState *vs, int x, int y, int w, int h,
 702                                  uint32_t color, int *w_ptr, int *h_ptr)
 703 {
 704     int dx, dy, dw, dh;
 705     int w_prev;
 706     int w_best = 0, h_best = 0;
 707
 708     w_prev = w;
 709
 710     for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
 711
 712         dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy);
 713         dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev);
 714
 715         if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) {
 716             break;
 717         }
 718
 719         for (dx = x + dw; dx < x + w_prev;) {
 720             dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx);
 721
 722             if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) {
 723                 break;
 724             }
 725             dx += dw;
 726         }
 727
 728         w_prev = dx - x;
 729         if (w_prev * (dy + dh - y) > w_best * h_best) {
 730             w_best = w_prev;
 731             h_best = dy + dh - y;
 732         }
 733     }
 734
 735     *w_ptr = w_best;
 736     *h_ptr = h_best;
 737 }
 738
 739 static void extend_solid_area(VncState *vs, int x, int y, int w, int h,
 740                               uint32_t color, int *x_ptr, int *y_ptr,
 741                               int *w_ptr, int *h_ptr)
 742 {
 743     int cx, cy;
 744
 745     /* Try to extend the area upwards. */
 746     for ( cy = *y_ptr - 1;
 747           cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
 748           cy-- );
 749     *h_ptr += *y_ptr - (cy + 1);
 750     *y_ptr = cy + 1;
 751
 752     /* ... downwards. */
 753     for ( cy = *y_ptr + *h_ptr;
 754           cy < y + h &&
 755               check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true);
 756           cy++ );
 757     *h_ptr += cy - (*y_ptr + *h_ptr);
 758
 759     /* ... to the left. */
 760     for ( cx = *x_ptr - 1;
 761           cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
 762           cx-- );
 763     *w_ptr += *x_ptr - (cx + 1);
 764     *x_ptr = cx + 1;
 765
 766     /* ... to the right. */
 767     for ( cx = *x_ptr + *w_ptr;
 768           cx < x + w &&
 769               check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true);
 770           cx++ );
 771     *w_ptr += cx - (*x_ptr + *w_ptr);
 772 }
 773
 774 static int tight_init_stream(VncState *vs, int stream_id,
 775                              int level, int strategy)
 776 {
 777     z_streamp zstream = &vs->tight.stream[stream_id];
 778
 779     if (zstream->opaque == NULL) {
 780         int err;
 781
 782         VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id);
 783         VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs);
 784         zstream->zalloc = vnc_zlib_zalloc;
 785         zstream->zfree = vnc_zlib_zfree;
 786
 787         err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
 788                            MAX_MEM_LEVEL, strategy);
 789
 790         if (err != Z_OK) {
 791             fprintf(stderr, "VNC: error initializing zlib\n");
 792             return -1;
 793         }
 794
 795         vs->tight.levels[stream_id] = level;
 796         zstream->opaque = vs;
 797     }
 798
 799     if (vs->tight.levels[stream_id] != level) {
 800         if (deflateParams(zstream, level, strategy) != Z_OK) {
 801             return -1;
 802         }
 803         vs->tight.levels[stream_id] = level;
 804     }
 805     return 0;
 806 }
 807
 808 static void tight_send_compact_size(VncState *vs, size_t len)
 809 {
 810     int lpc = 0;
 811     int bytes = 0;
 812     char buf[3] = {0, 0, 0};
 813
 814     buf[bytes++] = len & 0x7F;
 815     if (len > 0x7F) {
 816         buf[bytes-1] |= 0x80;
 817         buf[bytes++] = (len >> 7) & 0x7F;
 818         if (len > 0x3FFF) {
 819             buf[bytes-1] |= 0x80;
 820             buf[bytes++] = (len >> 14) & 0xFF;
 821         }
 822     }
 823     for (lpc = 0; lpc < bytes; lpc++) {
 824         vnc_write_u8(vs, buf[lpc]);
 825     }
 826 }
 827
 828 static int tight_compress_data(VncState *vs, int stream_id, size_t bytes,
 829                                int level, int strategy)
 830 {
 831     z_streamp zstream = &vs->tight.stream[stream_id];
 832     int previous_out;
 833
 834     if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) {
 835         vnc_write(vs, vs->tight.tight.buffer, vs->tight.tight.offset);
 836         return bytes;
 837     }
 838
 839     if (tight_init_stream(vs, stream_id, level, strategy)) {
 840         return -1;
 841     }
 842
 843     /* reserve memory in output buffer */
 844     buffer_reserve(&vs->tight.zlib, bytes + 64);
 845
 846     /* set pointers */
 847     zstream->next_in = vs->tight.tight.buffer;
 848     zstream->avail_in = vs->tight.tight.offset;
 849     zstream->next_out = vs->tight.zlib.buffer + vs->tight.zlib.offset;
 850     zstream->avail_out = vs->tight.zlib.capacity - vs->tight.zlib.offset;
 851     previous_out = zstream->avail_out;
 852     zstream->data_type = Z_BINARY;
 853
 854     /* start encoding */
 855     if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
 856         fprintf(stderr, "VNC: error during tight compression\n");
 857         return -1;
 858     }
 859
 860     vs->tight.zlib.offset = vs->tight.zlib.capacity - zstream->avail_out;
 861     /* ...how much data has actually been produced by deflate() */
 862     bytes = previous_out - zstream->avail_out;
 863
 864     tight_send_compact_size(vs, bytes);
 865     vnc_write(vs, vs->tight.zlib.buffer, bytes);
 866
 867     buffer_reset(&vs->tight.zlib);
 868
 869     return bytes;
 870 }
 871
 872 /*
 873  * Subencoding implementations.
 874  */
 875 static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret)
 876 {
 877     uint32_t *buf32;
 878     uint32_t pix;
 879     int rshift, gshift, bshift;
 880
 881     buf32 = (uint32_t *)buf;
 882
 883     if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) ==
 884         (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) {
 885         rshift = vs->clientds.pf.rshift;
 886         gshift = vs->clientds.pf.gshift;
 887         bshift = vs->clientds.pf.bshift;
 888     } else {
 889         rshift = 24 - vs->clientds.pf.rshift;
 890         gshift = 24 - vs->clientds.pf.gshift;
 891         bshift = 24 - vs->clientds.pf.bshift;
 892     }
 893
 894     if (ret) {
 895         *ret = count * 3;
 896     }
 897
 898     while (count--) {
 899         pix = *buf32++;
 900         *buf++ = (char)(pix >> rshift);
 901         *buf++ = (char)(pix >> gshift);
 902         *buf++ = (char)(pix >> bshift);
 903     }
 904 }
 905
 906 static int send_full_color_rect(VncState *vs, int x, int y, int w, int h)
 907 {
 908     int stream = 0;
 909     ssize_t bytes;
 910
 911 #ifdef CONFIG_VNC_PNG
 912     if (tight_can_send_png_rect(vs, w, h)) {
 913         return send_png_rect(vs, x, y, w, h, NULL);
 914     }
 915 #endif
 916
 917     vnc_write_u8(vs, stream << 4); /* no flushing, no filter */
 918
 919     if (vs->tight.pixel24) {
 920         tight_pack24(vs, vs->tight.tight.buffer, w * h, &vs->tight.tight.offset);
 921         bytes = 3;
 922     } else {
 923         bytes = vs->clientds.pf.bytes_per_pixel;
 924     }
 925
 926     bytes = tight_compress_data(vs, stream, w * h * bytes,
 927                                 tight_conf[vs->tight.compression].raw_zlib_level,
 928                                 Z_DEFAULT_STRATEGY);
 929
 930     return (bytes >= 0);
 931 }
 932
 933 static int send_solid_rect(VncState *vs)
 934 {
 935     size_t bytes;
 936
 937     vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */
 938
 939     if (vs->tight.pixel24) {
 940         tight_pack24(vs, vs->tight.tight.buffer, 1, &vs->tight.tight.offset);
 941         bytes = 3;
 942     } else {
 943         bytes = vs->clientds.pf.bytes_per_pixel;
 944     }
 945
 946     vnc_write(vs, vs->tight.tight.buffer, bytes);
 947     return 1;
 948 }
 949
 950 static int send_mono_rect(VncState *vs, int x, int y,
 951                           int w, int h, uint32_t bg, uint32_t fg)
 952 {
 953     ssize_t bytes;
 954     int stream = 1;
 955     int level = tight_conf[vs->tight.compression].mono_zlib_level;
 956
 957 #ifdef CONFIG_VNC_PNG
 958     if (tight_can_send_png_rect(vs, w, h)) {
 959         int ret;
 960         int bpp = vs->clientds.pf.bytes_per_pixel * 8;
 961         VncPalette *palette = palette_new(2, bpp);
 962
 963         palette_put(palette, bg);
 964         palette_put(palette, fg);
 965         ret = send_png_rect(vs, x, y, w, h, palette);
 966         palette_destroy(palette);
 967         return ret;
 968     }
 969 #endif
 970
 971     bytes = ((w + 7) / 8) * h;
 972
 973     vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
 974     vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
 975     vnc_write_u8(vs, 1);
 976
 977     switch(vs->clientds.pf.bytes_per_pixel) {
 978     case 4:
 979     {
 980         uint32_t buf[2] = {bg, fg};
 981         size_t ret = sizeof (buf);
 982
 983         if (vs->tight.pixel24) {
 984             tight_pack24(vs, (unsigned char*)buf, 2, &ret);
 985         }
 986         vnc_write(vs, buf, ret);
 987
 988         tight_encode_mono_rect32(vs->tight.tight.buffer, w, h, bg, fg);
 989         break;
 990     }
 991     case 2:
 992         vnc_write(vs, &bg, 2);
 993         vnc_write(vs, &fg, 2);
 994         tight_encode_mono_rect16(vs->tight.tight.buffer, w, h, bg, fg);
 995         break;
 996     default:
 997         vnc_write_u8(vs, bg);
 998         vnc_write_u8(vs, fg);
 999         tight_encode_mono_rect8(vs->tight.tight.buffer, w, h, bg, fg);
1000         break;
1001     }
1002     vs->tight.tight.offset = bytes;
1003
1004     bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY);
1005     return (bytes >= 0);
1006 }
1007
1008 struct palette_cb_priv {
1009     VncState *vs;
1010     uint8_t *header;
1011 #ifdef CONFIG_VNC_PNG
1012     png_colorp png_palette;
1013 #endif
1014 };
1015
1016 static void write_palette(int idx, uint32_t color, void *opaque)
1017 {
1018     struct palette_cb_priv *priv = opaque;
1019     VncState *vs = priv->vs;
1020     uint32_t bytes = vs->clientds.pf.bytes_per_pixel;
1021
1022     if (bytes == 4) {
1023         ((uint32_t*)priv->header)[idx] = color;
1024     } else {
1025         ((uint16_t*)priv->header)[idx] = color;
1026     }
1027 }
1028
1029 static bool send_gradient_rect(VncState *vs, int x, int y, int w, int h)
1030 {
1031     int stream = 3;
1032     int level = tight_conf[vs->tight.compression].gradient_zlib_level;
1033     ssize_t bytes;
1034
1035     if (vs->clientds.pf.bytes_per_pixel == 1)
1036         return send_full_color_rect(vs, x, y, w, h);
1037
1038     vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1039     vnc_write_u8(vs, VNC_TIGHT_FILTER_GRADIENT);
1040
1041     buffer_reserve(&vs->tight.gradient, w * 3 * sizeof (int));
1042
1043     if (vs->tight.pixel24) {
1044         tight_filter_gradient24(vs, vs->tight.tight.buffer, w, h);
1045         bytes = 3;
1046     } else if (vs->clientds.pf.bytes_per_pixel == 4) {
1047         tight_filter_gradient32(vs, (uint32_t *)vs->tight.tight.buffer, w, h);
1048         bytes = 4;
1049     } else {
1050         tight_filter_gradient16(vs, (uint16_t *)vs->tight.tight.buffer, w, h);
1051         bytes = 2;
1052     }
1053
1054     buffer_reset(&vs->tight.gradient);
1055
1056     bytes = w * h * bytes;
1057     vs->tight.tight.offset = bytes;
1058
1059     bytes = tight_compress_data(vs, stream, bytes,
1060                                 level, Z_FILTERED);
1061     return (bytes >= 0);
1062 }
1063
1064 static int send_palette_rect(VncState *vs, int x, int y,
1065                              int w, int h, VncPalette *palette)
1066 {
1067     int stream = 2;
1068     int level = tight_conf[vs->tight.compression].idx_zlib_level;
1069     int colors;
1070     ssize_t bytes;
1071
1072 #ifdef CONFIG_VNC_PNG
1073     if (tight_can_send_png_rect(vs, w, h)) {
1074         return send_png_rect(vs, x, y, w, h, palette);
1075     }
1076 #endif
1077
1078     colors = palette_size(palette);
1079
1080     vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4);
1081     vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE);
1082     vnc_write_u8(vs, colors - 1);
1083
1084     switch(vs->clientds.pf.bytes_per_pixel) {
1085     case 4:
1086     {
1087         size_t old_offset, offset;
1088         uint32_t header[palette_size(palette)];
1089         struct palette_cb_priv priv = { vs, (uint8_t *)header };
1090
1091         old_offset = vs->output.offset;
1092         palette_iter(palette, write_palette, &priv);
1093         vnc_write(vs, header, sizeof(header));
1094
1095         if (vs->tight.pixel24) {
1096             tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset);
1097             vs->output.offset = old_offset + offset;
1098         }
1099
1100         tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1101         break;
1102     }
1103     case 2:
1104     {
1105         uint16_t header[palette_size(palette)];
1106         struct palette_cb_priv priv = { vs, (uint8_t *)header };
1107
1108         palette_iter(palette, write_palette, &priv);
1109         vnc_write(vs, header, sizeof(header));
1110         tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1111         break;
1112     }
1113     default:
1114         return -1; /* No palette for 8bits colors */
1115         break;
1116     }
1117     bytes = w * h;
1118     vs->tight.tight.offset = bytes;
1119
1120     bytes = tight_compress_data(vs, stream, bytes,
1121                                 level, Z_DEFAULT_STRATEGY);
1122     return (bytes >= 0);
1123 }
1124
1125 #if defined(CONFIG_VNC_JPEG) || defined(CONFIG_VNC_PNG)
1126 static void rgb_prepare_row24(VncState *vs, uint8_t *dst, int x, int y,
1127                               int count)
1128 {
1129     VncDisplay *vd = vs->vd;
1130     uint32_t *fbptr;
1131     uint32_t pix;
1132
1133     fbptr = (uint32_t *)(vd->server->data + y * ds_get_linesize(vs->ds) +
1134                          x * ds_get_bytes_per_pixel(vs->ds));
1135
1136     while (count--) {
1137         pix = *fbptr++;
1138         *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.rshift);
1139         *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.gshift);
1140         *dst++ = (uint8_t)(pix >> vs->ds->surface->pf.bshift);
1141     }
1142 }
1143
1144 #define DEFINE_RGB_GET_ROW_FUNCTION(bpp)                                \
1145                                                                         \
1146     static void                                                         \
1147     rgb_prepare_row##bpp(VncState *vs, uint8_t *dst,                    \
1148                          int x, int y, int count)                       \
1149     {                                                                   \
1150         VncDisplay *vd = vs->vd;                                        \
1151         uint##bpp##_t *fbptr;                                           \
1152         uint##bpp##_t pix;                                              \
1153         int r, g, b;                                                    \
1154                                                                         \
1155         fbptr = (uint##bpp##_t *)                                       \
1156             (vd->server->data + y * ds_get_linesize(vs->ds) +           \
1157              x * ds_get_bytes_per_pixel(vs->ds));                       \
1158                                                                         \
1159         while (count--) {                                               \
1160             pix = *fbptr++;                                             \
1161                                                                         \
1162             r = (int)((pix >> vs->ds->surface->pf.rshift)               \
1163                       & vs->ds->surface->pf.rmax);                      \
1164             g = (int)((pix >> vs->ds->surface->pf.gshift)               \
1165                       & vs->ds->surface->pf.gmax);                      \
1166             b = (int)((pix >> vs->ds->surface->pf.bshift)               \
1167                       & vs->ds->surface->pf.bmax);                      \
1168                                                                         \
1169             *dst++ = (uint8_t)((r * 255 + vs->ds->surface->pf.rmax / 2) \
1170                                / vs->ds->surface->pf.rmax);             \
1171             *dst++ = (uint8_t)((g * 255 + vs->ds->surface->pf.gmax / 2) \
1172                                / vs->ds->surface->pf.gmax);             \
1173             *dst++ = (uint8_t)((b * 255 + vs->ds->surface->pf.bmax / 2) \
1174                                / vs->ds->surface->pf.bmax);             \
1175         }                                                               \
1176     }
1177
1178 DEFINE_RGB_GET_ROW_FUNCTION(16)
1179 DEFINE_RGB_GET_ROW_FUNCTION(32)
1180
1181 static void rgb_prepare_row(VncState *vs, uint8_t *dst, int x, int y,
1182                             int count)
1183 {
1184     if (ds_get_bytes_per_pixel(vs->ds) == 4) {
1185         if (vs->ds->surface->pf.rmax == 0xFF &&
1186             vs->ds->surface->pf.gmax == 0xFF &&
1187             vs->ds->surface->pf.bmax == 0xFF) {
1188             rgb_prepare_row24(vs, dst, x, y, count);
1189         } else {
1190             rgb_prepare_row32(vs, dst, x, y, count);
1191         }
1192     } else {
1193         rgb_prepare_row16(vs, dst, x, y, count);
1194     }
1195 }
1196 #endif /* CONFIG_VNC_JPEG or CONFIG_VNC_PNG */
1197
1198 /*
1199  * JPEG compression stuff.
1200  */
1201 #ifdef CONFIG_VNC_JPEG
1202 /*
1203  * Destination manager implementation for JPEG library.
1204  */
1205
1206 /* This is called once per encoding */
1207 static void jpeg_init_destination(j_compress_ptr cinfo)
1208 {
1209     VncState *vs = cinfo->client_data;
1210     Buffer *buffer = &vs->tight.jpeg;
1211
1212     cinfo->dest->next_output_byte = (JOCTET *)buffer->buffer + buffer->offset;
1213     cinfo->dest->free_in_buffer = (size_t)(buffer->capacity - buffer->offset);
1214 }
1215
1216 /* This is called when we ran out of buffer (shouldn't happen!) */
1217 static boolean jpeg_empty_output_buffer(j_compress_ptr cinfo)
1218 {
1219     VncState *vs = cinfo->client_data;
1220     Buffer *buffer = &vs->tight.jpeg;
1221
1222     buffer->offset = buffer->capacity;
1223     buffer_reserve(buffer, 2048);
1224     jpeg_init_destination(cinfo);
1225     return TRUE;
1226 }
1227
1228 /* This is called when we are done processing data */
1229 static void jpeg_term_destination(j_compress_ptr cinfo)
1230 {
1231     VncState *vs = cinfo->client_data;
1232     Buffer *buffer = &vs->tight.jpeg;
1233
1234     buffer->offset = buffer->capacity - cinfo->dest->free_in_buffer;
1235 }
1236
1237 static int send_jpeg_rect(VncState *vs, int x, int y, int w, int h, int quality)
1238 {
1239     struct jpeg_compress_struct cinfo;
1240     struct jpeg_error_mgr jerr;
1241     struct jpeg_destination_mgr manager;
1242     JSAMPROW row[1];
1243     uint8_t *buf;
1244     int dy;
1245
1246     if (ds_get_bytes_per_pixel(vs->ds) == 1)
1247         return send_full_color_rect(vs, x, y, w, h);
1248
1249     buffer_reserve(&vs->tight.jpeg, 2048);
1250
1251     cinfo.err = jpeg_std_error(&jerr);
1252     jpeg_create_compress(&cinfo);
1253
1254     cinfo.client_data = vs;
1255     cinfo.image_width = w;
1256     cinfo.image_height = h;
1257     cinfo.input_components = 3;
1258     cinfo.in_color_space = JCS_RGB;
1259
1260     jpeg_set_defaults(&cinfo);
1261     jpeg_set_quality(&cinfo, quality, true);
1262
1263     manager.init_destination = jpeg_init_destination;
1264     manager.empty_output_buffer = jpeg_empty_output_buffer;
1265     manager.term_destination = jpeg_term_destination;
1266     cinfo.dest = &manager;
1267
1268     jpeg_start_compress(&cinfo, true);
1269
1270     buf = qemu_malloc(w * 3);
1271     row[0] = buf;
1272     for (dy = 0; dy < h; dy++) {
1273         rgb_prepare_row(vs, buf, x, y + dy, w);
1274         jpeg_write_scanlines(&cinfo, row, 1);
1275     }
1276     qemu_free(buf);
1277
1278     jpeg_finish_compress(&cinfo);
1279     jpeg_destroy_compress(&cinfo);
1280
1281     vnc_write_u8(vs, VNC_TIGHT_JPEG << 4);
1282
1283     tight_send_compact_size(vs, vs->tight.jpeg.offset);
1284     vnc_write(vs, vs->tight.jpeg.buffer, vs->tight.jpeg.offset);
1285     buffer_reset(&vs->tight.jpeg);
1286
1287     return 1;
1288 }
1289 #endif /* CONFIG_VNC_JPEG */
1290
1291 /*
1292  * PNG compression stuff.
1293  */
1294 #ifdef CONFIG_VNC_PNG
1295 static void write_png_palette(int idx, uint32_t pix, void *opaque)
1296 {
1297     struct palette_cb_priv *priv = opaque;
1298     VncState *vs = priv->vs;
1299     png_colorp color = &priv->png_palette[idx];
1300
1301     if (vs->tight.pixel24)
1302     {
1303         color->red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1304         color->green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1305         color->blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1306     }
1307     else
1308     {
1309         int red, green, blue;
1310
1311         red = (pix >> vs->clientds.pf.rshift) & vs->clientds.pf.rmax;
1312         green = (pix >> vs->clientds.pf.gshift) & vs->clientds.pf.gmax;
1313         blue = (pix >> vs->clientds.pf.bshift) & vs->clientds.pf.bmax;
1314         color->red = ((red * 255 + vs->clientds.pf.rmax / 2) /
1315                       vs->clientds.pf.rmax);
1316         color->green = ((green * 255 + vs->clientds.pf.gmax / 2) /
1317                         vs->clientds.pf.gmax);
1318         color->blue = ((blue * 255 + vs->clientds.pf.bmax / 2) /
1319                        vs->clientds.pf.bmax);
1320     }
1321 }
1322
1323 static void png_write_data(png_structp png_ptr, png_bytep data,
1324                            png_size_t length)
1325 {
1326     VncState *vs = png_get_io_ptr(png_ptr);
1327
1328     buffer_reserve(&vs->tight.png, vs->tight.png.offset + length);
1329     memcpy(vs->tight.png.buffer + vs->tight.png.offset, data, length);
1330
1331     vs->tight.png.offset += length;
1332 }
1333
1334 static void png_flush_data(png_structp png_ptr)
1335 {
1336 }
1337
1338 static void *vnc_png_malloc(png_structp png_ptr, png_size_t size)
1339 {
1340     return qemu_malloc(size);
1341 }
1342
1343 static void vnc_png_free(png_structp png_ptr, png_voidp ptr)
1344 {
1345     qemu_free(ptr);
1346 }
1347
1348 static int send_png_rect(VncState *vs, int x, int y, int w, int h,
1349                          VncPalette *palette)
1350 {
1351     png_byte color_type;
1352     png_structp png_ptr;
1353     png_infop info_ptr;
1354     png_colorp png_palette = NULL;
1355     int level = tight_png_conf[vs->tight.compression].png_zlib_level;
1356     int filters = tight_png_conf[vs->tight.compression].png_filters;
1357     uint8_t *buf;
1358     int dy;
1359
1360     png_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL,
1361                                         NULL, vnc_png_malloc, vnc_png_free);
1362
1363     if (png_ptr == NULL)
1364         return -1;
1365
1366     info_ptr = png_create_info_struct(png_ptr);
1367
1368     if (info_ptr == NULL) {
1369         png_destroy_write_struct(&png_ptr, NULL);
1370         return -1;
1371     }
1372
1373     png_set_write_fn(png_ptr, (void *) vs, png_write_data, png_flush_data);
1374     png_set_compression_level(png_ptr, level);
1375     png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, filters);
1376
1377     if (palette) {
1378         color_type = PNG_COLOR_TYPE_PALETTE;
1379     } else {
1380         color_type = PNG_COLOR_TYPE_RGB;
1381     }
1382
1383     png_set_IHDR(png_ptr, info_ptr, w, h,
1384                  8, color_type, PNG_INTERLACE_NONE,
1385                  PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
1386
1387     if (color_type == PNG_COLOR_TYPE_PALETTE) {
1388         struct palette_cb_priv priv;
1389
1390         png_palette = png_malloc(png_ptr, sizeof(*png_palette) *
1391                                  palette_size(palette));
1392
1393         priv.vs = vs;
1394         priv.png_palette = png_palette;
1395         palette_iter(palette, write_png_palette, &priv);
1396
1397         png_set_PLTE(png_ptr, info_ptr, png_palette, palette_size(palette));
1398
1399         if (vs->clientds.pf.bytes_per_pixel == 4) {
1400             tight_encode_indexed_rect32(vs->tight.tight.buffer, w * h, palette);
1401         } else {
1402             tight_encode_indexed_rect16(vs->tight.tight.buffer, w * h, palette);
1403         }
1404     }
1405
1406     png_write_info(png_ptr, info_ptr);
1407
1408     buffer_reserve(&vs->tight.png, 2048);
1409     buf = qemu_malloc(w * 3);
1410     for (dy = 0; dy < h; dy++)
1411     {
1412         if (color_type == PNG_COLOR_TYPE_PALETTE) {
1413             memcpy(buf, vs->tight.tight.buffer + (dy * w), w);
1414         } else {
1415             rgb_prepare_row(vs, buf, x, y + dy, w);
1416         }
1417         png_write_row(png_ptr, buf);
1418     }
1419     qemu_free(buf);
1420
1421     png_write_end(png_ptr, NULL);
1422
1423     if (color_type == PNG_COLOR_TYPE_PALETTE) {
1424         png_free(png_ptr, png_palette);
1425     }
1426
1427     png_destroy_write_struct(&png_ptr, &info_ptr);
1428
1429     vnc_write_u8(vs, VNC_TIGHT_PNG << 4);
1430
1431     tight_send_compact_size(vs, vs->tight.png.offset);
1432     vnc_write(vs, vs->tight.png.buffer, vs->tight.png.offset);
1433     buffer_reset(&vs->tight.png);
1434     return 1;
1435 }
1436 #endif /* CONFIG_VNC_PNG */
1437
1438 static void vnc_tight_start(VncState *vs)
1439 {
1440     buffer_reset(&vs->tight.tight);
1441
1442     // make the output buffer be the zlib buffer, so we can compress it later
1443     vs->tight.tmp = vs->output;
1444     vs->output = vs->tight.tight;
1445 }
1446
1447 static void vnc_tight_stop(VncState *vs)
1448 {
1449     // switch back to normal output/zlib buffers
1450     vs->tight.tight = vs->output;
1451     vs->output = vs->tight.tmp;
1452 }
1453
1454 static int send_sub_rect_nojpeg(VncState *vs, int x, int y, int w, int h,
1455                                 int bg, int fg, int colors, VncPalette *palette)
1456 {
1457     int ret;
1458
1459     if (colors == 0) {
1460         if (tight_detect_smooth_image(vs, w, h)) {
1461             ret = send_gradient_rect(vs, x, y, w, h);
1462         } else {
1463             ret = send_full_color_rect(vs, x, y, w, h);
1464         }
1465     } else if (colors == 1) {
1466         ret = send_solid_rect(vs);
1467     } else if (colors == 2) {
1468         ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1469     } else if (colors <= 256) {
1470         ret = send_palette_rect(vs, x, y, w, h, palette);
1471     } else {
1472         ret = 0;
1473     }
1474     return ret;
1475 }
1476
1477 #ifdef CONFIG_VNC_JPEG
1478 static int send_sub_rect_jpeg(VncState *vs, int x, int y, int w, int h,
1479                               int bg, int fg, int colors,
1480                               VncPalette *palette)
1481 {
1482     int ret;
1483
1484     if (colors == 0) {
1485         if (tight_detect_smooth_image(vs, w, h)) {
1486             int quality = tight_conf[vs->tight.quality].jpeg_quality;
1487
1488             ret = send_jpeg_rect(vs, x, y, w, h, quality);
1489         } else {
1490             ret = send_full_color_rect(vs, x, y, w, h);
1491         }
1492     } else if (colors == 1) {
1493         ret = send_solid_rect(vs);
1494     } else if (colors == 2) {
1495         ret = send_mono_rect(vs, x, y, w, h, bg, fg);
1496     } else if (colors <= 256) {
1497         if (colors > 96 &&
1498             tight_detect_smooth_image(vs, w, h)) {
1499             int quality = tight_conf[vs->tight.quality].jpeg_quality;
1500
1501             ret = send_jpeg_rect(vs, x, y, w, h, quality);
1502         } else {
1503             ret = send_palette_rect(vs, x, y, w, h, palette);
1504         }
1505     } else {
1506         ret = 0;
1507     }
1508     return ret;
1509 }
1510 #endif
1511
1512 static int send_sub_rect(VncState *vs, int x, int y, int w, int h)
1513 {
1514     VncPalette *palette = NULL;
1515     uint32_t bg = 0, fg = 0;
1516     int colors;
1517     int ret = 0;
1518
1519     vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1520
1521     vnc_tight_start(vs);
1522     vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1523     vnc_tight_stop(vs);
1524
1525     colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette);
1526
1527 #ifdef CONFIG_VNC_JPEG
1528     if (vs->tight.quality != (uint8_t)-1) {
1529         ret = send_sub_rect_jpeg(vs, x, y, w, h, bg, fg, colors, palette);
1530     } else {
1531         ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1532     }
1533 #else
1534     ret = send_sub_rect_nojpeg(vs, x, y, w, h, bg, fg, colors, palette);
1535 #endif
1536
1537     palette_destroy(palette);
1538     return ret;
1539 }
1540
1541 static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h)
1542 {
1543     vnc_framebuffer_update(vs, x, y, w, h, vs->tight.type);
1544
1545     vnc_tight_start(vs);
1546     vnc_raw_send_framebuffer_update(vs, x, y, w, h);
1547     vnc_tight_stop(vs);
1548
1549     return send_solid_rect(vs);
1550 }
1551
1552 static int send_rect_simple(VncState *vs, int x, int y, int w, int h)
1553 {
1554     int max_size, max_width;
1555     int max_sub_width, max_sub_height;
1556     int dx, dy;
1557     int rw, rh;
1558     int n = 0;
1559
1560     max_size = tight_conf[vs->tight.compression].max_rect_size;
1561     max_width = tight_conf[vs->tight.compression].max_rect_width;
1562
1563     if (w > max_width || w * h > max_size) {
1564         max_sub_width = (w > max_width) ? max_width : w;
1565         max_sub_height = max_size / max_sub_width;
1566
1567         for (dy = 0; dy < h; dy += max_sub_height) {
1568             for (dx = 0; dx < w; dx += max_width) {
1569                 rw = MIN(max_sub_width, w - dx);
1570                 rh = MIN(max_sub_height, h - dy);
1571                 n += send_sub_rect(vs, x+dx, y+dy, rw, rh);
1572             }
1573         }
1574     } else {
1575         n += send_sub_rect(vs, x, y, w, h);
1576     }
1577
1578     return n;
1579 }
1580
1581 static int find_large_solid_color_rect(VncState *vs, int x, int y,
1582                                        int w, int h, int max_rows)
1583 {
1584     int dx, dy, dw, dh;
1585     int n = 0;
1586
1587     /* Try to find large solid-color areas and send them separately. */
1588
1589     for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1590
1591         /* If a rectangle becomes too large, send its upper part now. */
1592
1593         if (dy - y >= max_rows) {
1594             n += send_rect_simple(vs, x, y, w, max_rows);
1595             y += max_rows;
1596             h -= max_rows;
1597         }
1598
1599         dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy));
1600
1601         for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) {
1602             uint32_t color_value;
1603             int x_best, y_best, w_best, h_best;
1604
1605             dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx));
1606
1607             if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) {
1608                 continue ;
1609             }
1610
1611             /* Get dimensions of solid-color area. */
1612
1613             find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y),
1614                                  color_value, &w_best, &h_best);
1615
1616             /* Make sure a solid rectangle is large enough
1617                (or the whole rectangle is of the same color). */
1618
1619             if (w_best * h_best != w * h &&
1620                 w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) {
1621                 continue;
1622             }
1623
1624             /* Try to extend solid rectangle to maximum size. */
1625
1626             x_best = dx; y_best = dy;
1627             extend_solid_area(vs, x, y, w, h, color_value,
1628                               &x_best, &y_best, &w_best, &h_best);
1629
1630             /* Send rectangles at top and left to solid-color area. */
1631
1632             if (y_best != y) {
1633                 n += send_rect_simple(vs, x, y, w, y_best-y);
1634             }
1635             if (x_best != x) {
1636                 n += tight_send_framebuffer_update(vs, x, y_best,
1637                                                    x_best-x, h_best);
1638             }
1639
1640             /* Send solid-color rectangle. */
1641             n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best);
1642
1643             /* Send remaining rectangles (at right and bottom). */
1644
1645             if (x_best + w_best != x + w) {
1646                 n += tight_send_framebuffer_update(vs, x_best+w_best,
1647                                                    y_best,
1648                                                    w-(x_best-x)-w_best,
1649                                                    h_best);
1650             }
1651             if (y_best + h_best != y + h) {
1652                 n += tight_send_framebuffer_update(vs, x, y_best+h_best,
1653                                                    w, h-(y_best-y)-h_best);
1654             }
1655
1656             /* Return after all recursive calls are done. */
1657             return n;
1658         }
1659     }
1660     return n + send_rect_simple(vs, x, y, w, h);
1661 }
1662
1663 static int tight_send_framebuffer_update(VncState *vs, int x, int y,
1664                                          int w, int h)
1665 {
1666     int max_rows;
1667
1668     if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF &&
1669         vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) {
1670         vs->tight.pixel24 = true;
1671     } else {
1672         vs->tight.pixel24 = false;
1673     }
1674
1675     if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE)
1676         return send_rect_simple(vs, x, y, w, h);
1677
1678     /* Calculate maximum number of rows in one non-solid rectangle. */
1679
1680     max_rows = tight_conf[vs->tight.compression].max_rect_size;
1681     max_rows /= MIN(tight_conf[vs->tight.compression].max_rect_width, w);
1682
1683     return find_large_solid_color_rect(vs, x, y, w, h, max_rows);
1684 }
1685
1686 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y,
1687                                       int w, int h)
1688 {
1689     vs->tight.type = VNC_ENCODING_TIGHT;
1690     return tight_send_framebuffer_update(vs, x, y, w, h);
1691 }
1692
1693 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
1694                                           int w, int h)
1695 {
1696     vs->tight.type = VNC_ENCODING_TIGHT_PNG;
1697     return tight_send_framebuffer_update(vs, x, y, w, h);
1698 }
1699
1700 void vnc_tight_clear(VncState *vs)
1701 {
1702     int i;
1703     for (i=0; i<ARRAY_SIZE(vs->tight.stream); i++) {
1704         if (vs->tight.stream[i].opaque) {
1705             deflateEnd(&vs->tight.stream[i]);
1706         }
1707     }
1708
1709     buffer_free(&vs->tight.tight);
1710     buffer_free(&vs->tight.zlib);
1711     buffer_free(&vs->tight.gradient);
1712 #ifdef CONFIG_VNC_JPEG
1713     buffer_free(&vs->tight.jpeg);
1714 #endif
1715 #ifdef CONFIG_VNC_PNG
1716     buffer_free(&vs->tight.png);
1717 #endif
1718 }