ui/vnc.h

   1 /*
   2  * QEMU VNC display driver
   3  *
   4  * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
   5  * Copyright (C) 2006 Fabrice Bellard
   6  * Copyright (C) 2009 Red Hat, Inc
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #ifndef __QEMU_VNC_H
  28 #define __QEMU_VNC_H
  29
  30 #include "qemu-common.h"
  31 #include "qemu-queue.h"
  32 #ifdef CONFIG_VNC_THREAD
  33 #include "qemu-thread.h"
  34 #endif
  35 #include "console.h"
  36 #include "monitor.h"
  37 #include "audio/audio.h"
  38 #include "bitmap.h"
  39 #include <zlib.h>
  40 #include <stdbool.h>
  41
  42 #include "keymaps.h"
  43 #include "vnc-palette.h"
  44 #include "vnc-enc-zrle.h"
  45
  46 // #define _VNC_DEBUG 1
  47
  48 #ifdef _VNC_DEBUG
  49 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  50 #else
  51 #define VNC_DEBUG(fmt, ...) do { } while (0)
  52 #endif
  53
  54 /*****************************************************************************
  55  *
  56  * Core data structures
  57  *
  58  *****************************************************************************/
  59
  60 typedef struct Buffer
  61 {
  62     size_t capacity;
  63     size_t offset;
  64     uint8_t *buffer;
  65 } Buffer;
  66
  67 typedef struct VncState VncState;
  68 typedef struct VncJob VncJob;
  69 typedef struct VncRect VncRect;
  70 typedef struct VncRectEntry VncRectEntry;
  71
  72 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  73
  74 typedef void VncWritePixels(VncState *vs, struct PixelFormat *pf, void *data, int size);
  75
  76 typedef void VncSendHextileTile(VncState *vs,
  77                                 int x, int y, int w, int h,
  78                                 void *last_bg,
  79                                 void *last_fg,
  80                                 int *has_bg, int *has_fg);
  81
  82 /* VNC_MAX_WIDTH must be a multiple of 16. */
  83 #define VNC_MAX_WIDTH 2560
  84 #define VNC_MAX_HEIGHT 2048
  85
  86 /* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
  87 #define VNC_DIRTY_BITS (VNC_MAX_WIDTH / 16)
  88
  89 #define VNC_STAT_RECT  64
  90 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
  91 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
  92
  93 #define VNC_AUTH_CHALLENGE_SIZE 16
  94
  95 typedef struct VncDisplay VncDisplay;
  96
  97 #ifdef CONFIG_VNC_TLS
  98 #include "vnc-tls.h"
  99 #include "vnc-auth-vencrypt.h"
 100 #endif
 101 #ifdef CONFIG_VNC_SASL
 102 #include "vnc-auth-sasl.h"
 103 #endif
 104
 105 struct VncRectStat
 106 {
 107     /* time of last 10 updates, to find update frequency */
 108     struct timeval times[10];
 109     int idx;
 110
 111     double freq;        /* Update frequency (in Hz) */
 112     bool updated;       /* Already updated during this refresh */
 113 };
 114
 115 typedef struct VncRectStat VncRectStat;
 116
 117 struct VncSurface
 118 {
 119     struct timeval last_freq_check;
 120     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_MAX_WIDTH / 16);
 121     VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
 122     DisplaySurface *ds;
 123 };
 124
 125 typedef enum VncShareMode {
 126     VNC_SHARE_MODE_CONNECTING = 1,
 127     VNC_SHARE_MODE_SHARED,
 128     VNC_SHARE_MODE_EXCLUSIVE,
 129     VNC_SHARE_MODE_DISCONNECTED,
 130 } VncShareMode;
 131
 132 typedef enum VncSharePolicy {
 133     VNC_SHARE_POLICY_IGNORE = 1,
 134     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 135     VNC_SHARE_POLICY_FORCE_SHARED,
 136 } VncSharePolicy;
 137
 138 struct VncDisplay
 139 {
 140     QTAILQ_HEAD(, VncState) clients;
 141     int num_exclusive;
 142     VncSharePolicy share_policy;
 143     QEMUTimer *timer;
 144     int timer_interval;
 145     int lsock;
 146     DisplayState *ds;
 147     kbd_layout_t *kbd_layout;
 148     int lock_key_sync;
 149 #ifdef CONFIG_VNC_THREAD
 150     QemuMutex mutex;
 151 #endif
 152
 153     QEMUCursor *cursor;
 154     int cursor_msize;
 155     uint8_t *cursor_mask;
 156
 157     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 158     DisplaySurface *server;  /* vnc server surface */
 159
 160     char *display;
 161     char *password;
 162     time_t expires;
 163     int auth;
 164     bool lossy;
 165     bool non_adaptive;
 166 #ifdef CONFIG_VNC_TLS
 167     int subauth; /* Used by VeNCrypt */
 168     VncDisplayTLS tls;
 169 #endif
 170 #ifdef CONFIG_VNC_SASL
 171     VncDisplaySASL sasl;
 172 #endif
 173 };
 174
 175 typedef struct VncTight {
 176     int type;
 177     uint8_t quality;
 178     uint8_t compression;
 179     uint8_t pixel24;
 180     Buffer tight;
 181     Buffer tmp;
 182     Buffer zlib;
 183     Buffer gradient;
 184 #ifdef CONFIG_VNC_JPEG
 185     Buffer jpeg;
 186 #endif
 187 #ifdef CONFIG_VNC_PNG
 188     Buffer png;
 189 #endif
 190     int levels[4];
 191     z_stream stream[4];
 192 } VncTight;
 193
 194 typedef struct VncHextile {
 195     VncSendHextileTile *send_tile;
 196 } VncHextile;
 197
 198 typedef struct VncZlib {
 199     Buffer zlib;
 200     Buffer tmp;
 201     z_stream stream;
 202     int level;
 203 } VncZlib;
 204
 205 typedef struct VncZrle {
 206     int type;
 207     Buffer fb;
 208     Buffer zrle;
 209     Buffer tmp;
 210     Buffer zlib;
 211     z_stream stream;
 212     VncPalette palette;
 213 } VncZrle;
 214
 215 typedef struct VncZywrle {
 216     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 217 } VncZywrle;
 218
 219 #ifdef CONFIG_VNC_THREAD
 220 struct VncRect
 221 {
 222     int x;
 223     int y;
 224     int w;
 225     int h;
 226 };
 227
 228 struct VncRectEntry
 229 {
 230     struct VncRect rect;
 231     QLIST_ENTRY(VncRectEntry) next;
 232 };
 233
 234 struct VncJob
 235 {
 236     VncState *vs;
 237
 238     QLIST_HEAD(, VncRectEntry) rectangles;
 239     QTAILQ_ENTRY(VncJob) next;
 240 };
 241 #else
 242 struct VncJob
 243 {
 244     VncState *vs;
 245     int rectangles;
 246     size_t saved_offset;
 247 };
 248 #endif
 249
 250 struct VncState
 251 {
 252     int csock;
 253
 254     DisplayState *ds;
 255     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 256     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 257                            * vnc-jobs-async.c */
 258
 259     VncDisplay *vd;
 260     int need_update;
 261     int force_update;
 262     uint32_t features;
 263     int absolute;
 264     int last_x;
 265     int last_y;
 266     int client_width;
 267     int client_height;
 268     VncShareMode share_mode;
 269
 270     uint32_t vnc_encoding;
 271
 272     int major;
 273     int minor;
 274
 275     int auth;
 276     char challenge[VNC_AUTH_CHALLENGE_SIZE];
 277 #ifdef CONFIG_VNC_TLS
 278     int subauth; /* Used by VeNCrypt */
 279     VncStateTLS tls;
 280 #endif
 281 #ifdef CONFIG_VNC_SASL
 282     VncStateSASL sasl;
 283 #endif
 284
 285     QObject *info;
 286
 287     Buffer output;
 288     Buffer input;
 289     /* current output mode information */
 290     VncWritePixels *write_pixels;
 291     DisplaySurface clientds;
 292
 293     CaptureVoiceOut *audio_cap;
 294     struct audsettings as;
 295
 296     VncReadEvent *read_handler;
 297     size_t read_handler_expect;
 298     /* input */
 299     uint8_t modifiers_state[256];
 300     QEMUPutLEDEntry *led;
 301
 302     bool abort;
 303 #ifndef CONFIG_VNC_THREAD
 304     VncJob job;
 305 #else
 306     QemuMutex output_mutex;
 307 #endif
 308
 309     /* Encoding specific, if you add something here, don't forget to
 310      *  update vnc_async_encoding_start()
 311      */
 312     VncTight tight;
 313     VncZlib zlib;
 314     VncHextile hextile;
 315     VncZrle zrle;
 316     VncZywrle zywrle;
 317
 318     Notifier mouse_mode_notifier;
 319
 320     QTAILQ_ENTRY(VncState) next;
 321 };
 322
 323
 324 /*****************************************************************************
 325  *
 326  * Authentication modes
 327  *
 328  *****************************************************************************/
 329
 330 enum {
 331     VNC_AUTH_INVALID = 0,
 332     VNC_AUTH_NONE = 1,
 333     VNC_AUTH_VNC = 2,
 334     VNC_AUTH_RA2 = 5,
 335     VNC_AUTH_RA2NE = 6,
 336     VNC_AUTH_TIGHT = 16,
 337     VNC_AUTH_ULTRA = 17,
 338     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 339     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 340     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 341 };
 342
 343 enum {
 344     VNC_AUTH_VENCRYPT_PLAIN = 256,
 345     VNC_AUTH_VENCRYPT_TLSNONE = 257,
 346     VNC_AUTH_VENCRYPT_TLSVNC = 258,
 347     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 348     VNC_AUTH_VENCRYPT_X509NONE = 260,
 349     VNC_AUTH_VENCRYPT_X509VNC = 261,
 350     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 351     VNC_AUTH_VENCRYPT_X509SASL = 263,
 352     VNC_AUTH_VENCRYPT_TLSSASL = 264,
 353 };
 354
 355
 356 /*****************************************************************************
 357  *
 358  * Encoding types
 359  *
 360  *****************************************************************************/
 361
 362 #define VNC_ENCODING_RAW                  0x00000000
 363 #define VNC_ENCODING_COPYRECT             0x00000001
 364 #define VNC_ENCODING_RRE                  0x00000002
 365 #define VNC_ENCODING_CORRE                0x00000004
 366 #define VNC_ENCODING_HEXTILE              0x00000005
 367 #define VNC_ENCODING_ZLIB                 0x00000006
 368 #define VNC_ENCODING_TIGHT                0x00000007
 369 #define VNC_ENCODING_ZLIBHEX              0x00000008
 370 #define VNC_ENCODING_TRLE                 0x0000000f
 371 #define VNC_ENCODING_ZRLE                 0x00000010
 372 #define VNC_ENCODING_ZYWRLE               0x00000011
 373 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 374 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 375 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 376 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 377 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 378 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 379 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 380 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 381 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 382 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 383 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 384 #define VNC_ENCODING_WMVi                 0x574D5669
 385
 386 /*****************************************************************************
 387  *
 388  * Other tight constants
 389  *
 390  *****************************************************************************/
 391
 392 /*
 393  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 394  */
 395
 396 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 397 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 398 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 399 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 400 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 401 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 402 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 403 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 404
 405 /*****************************************************************************
 406  *
 407  * Features
 408  *
 409  *****************************************************************************/
 410
 411 #define VNC_FEATURE_RESIZE                   0
 412 #define VNC_FEATURE_HEXTILE                  1
 413 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 414 #define VNC_FEATURE_WMVI                     3
 415 #define VNC_FEATURE_TIGHT                    4
 416 #define VNC_FEATURE_ZLIB                     5
 417 #define VNC_FEATURE_COPYRECT                 6
 418 #define VNC_FEATURE_RICH_CURSOR              7
 419 #define VNC_FEATURE_TIGHT_PNG                8
 420 #define VNC_FEATURE_ZRLE                     9
 421 #define VNC_FEATURE_ZYWRLE                  10
 422
 423 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 424 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 425 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 426 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 427 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 428 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 429 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 430 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 431 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 432 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 433 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 434
 435
 436 /* Client -> Server message IDs */
 437 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 438 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
 439 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 440 #define VNC_MSG_CLIENT_KEY_EVENT                  4
 441 #define VNC_MSG_CLIENT_POINTER_EVENT              5
 442 #define VNC_MSG_CLIENT_CUT_TEXT                   6
 443 #define VNC_MSG_CLIENT_VMWARE_0                   127
 444 #define VNC_MSG_CLIENT_CALL_CONTROL               249
 445 #define VNC_MSG_CLIENT_XVP                        250
 446 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 447 #define VNC_MSG_CLIENT_TIGHT                      252
 448 #define VNC_MSG_CLIENT_GII                        253
 449 #define VNC_MSG_CLIENT_VMWARE_1                   254
 450 #define VNC_MSG_CLIENT_QEMU                       255
 451
 452 /* Server -> Client message IDs */
 453 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 454 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 455 #define VNC_MSG_SERVER_BELL                       2
 456 #define VNC_MSG_SERVER_CUT_TEXT                   3
 457 #define VNC_MSG_SERVER_VMWARE_0                   127
 458 #define VNC_MSG_SERVER_CALL_CONTROL               249
 459 #define VNC_MSG_SERVER_XVP                        250
 460 #define VNC_MSG_SERVER_TIGHT                      252
 461 #define VNC_MSG_SERVER_GII                        253
 462 #define VNC_MSG_SERVER_VMWARE_1                   254
 463 #define VNC_MSG_SERVER_QEMU                       255
 464
 465
 466
 467 /* QEMU client -> server message IDs */
 468 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 469 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 470
 471 /* QEMU server -> client message IDs */
 472 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
 473
 474
 475
 476 /* QEMU client -> server audio message IDs */
 477 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 478 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 479 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 480
 481 /* QEMU server -> client audio message IDs */
 482 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 483 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 484 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 485
 486
 487 /*****************************************************************************
 488  *
 489  * Internal APIs
 490  *
 491  *****************************************************************************/
 492
 493 /* Event loop functions */
 494 void vnc_client_read(void *opaque);
 495 void vnc_client_write(void *opaque);
 496
 497 long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 498 long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 499
 500 /* Protocol I/O functions */
 501 void vnc_write(VncState *vs, const void *data, size_t len);
 502 void vnc_write_u32(VncState *vs, uint32_t value);
 503 void vnc_write_s32(VncState *vs, int32_t value);
 504 void vnc_write_u16(VncState *vs, uint16_t value);
 505 void vnc_write_u8(VncState *vs, uint8_t value);
 506 void vnc_flush(VncState *vs);
 507 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 508
 509
 510 /* Buffer I/O functions */
 511 uint8_t read_u8(uint8_t *data, size_t offset);
 512 uint16_t read_u16(uint8_t *data, size_t offset);
 513 int32_t read_s32(uint8_t *data, size_t offset);
 514 uint32_t read_u32(uint8_t *data, size_t offset);
 515
 516 /* Protocol stage functions */
 517 void vnc_client_error(VncState *vs);
 518 int vnc_client_io_error(VncState *vs, int ret, int last_errno);
 519
 520 void start_client_init(VncState *vs);
 521 void start_auth_vnc(VncState *vs);
 522
 523 /* Buffer management */
 524 void buffer_reserve(Buffer *buffer, size_t len);
 525 int buffer_empty(Buffer *buffer);
 526 uint8_t *buffer_end(Buffer *buffer);
 527 void buffer_reset(Buffer *buffer);
 528 void buffer_free(Buffer *buffer);
 529 void buffer_append(Buffer *buffer, const void *data, size_t len);
 530
 531
 532 /* Misc helpers */
 533
 534 char *vnc_socket_local_addr(const char *format, int fd);
 535 char *vnc_socket_remote_addr(const char *format, int fd);
 536
 537 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 538     return (vs->features & (1 << feature));
 539 }
 540
 541 /* Framebuffer */
 542 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 543                             int32_t encoding);
 544
 545 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 546 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 547 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 548
 549 /* Encodings */
 550 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 551
 552 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 553
 554 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 555                                          int y, int w, int h);
 556 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 557
 558 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 559 void vnc_zlib_zfree(void *x, void *addr);
 560 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 561 void vnc_zlib_clear(VncState *vs);
 562
 563 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 564 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 565                                           int w, int h);
 566 void vnc_tight_clear(VncState *vs);
 567
 568 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 569 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 570 void vnc_zrle_clear(VncState *vs);
 571
 572 #endif /* __QEMU_VNC_H */