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 #include "qemu-thread.h"
  33 #include "console.h"
  34 #include "monitor.h"
  35 #include "audio/audio.h"
  36 #include "bitmap.h"
  37 #include <zlib.h>
  38 #include <stdbool.h>
  39
  40 #include "keymaps.h"
  41 #include "vnc-palette.h"
  42 #include "vnc-enc-zrle.h"
  43
  44 // #define _VNC_DEBUG 1
  45
  46 #ifdef _VNC_DEBUG
  47 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  48 #else
  49 #define VNC_DEBUG(fmt, ...) do { } while (0)
  50 #endif
  51
  52 /*****************************************************************************
  53  *
  54  * Core data structures
  55  *
  56  *****************************************************************************/
  57
  58 typedef struct Buffer
  59 {
  60     size_t capacity;
  61     size_t offset;
  62     uint8_t *buffer;
  63 } Buffer;
  64
  65 typedef struct VncState VncState;
  66 typedef struct VncJob VncJob;
  67 typedef struct VncRect VncRect;
  68 typedef struct VncRectEntry VncRectEntry;
  69
  70 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  71
  72 typedef void VncWritePixels(VncState *vs, void *data, int size);
  73
  74 typedef void VncSendHextileTile(VncState *vs,
  75                                 int x, int y, int w, int h,
  76                                 void *last_bg,
  77                                 void *last_fg,
  78                                 int *has_bg, int *has_fg);
  79
  80 /* VNC_MAX_WIDTH must be a multiple of 16. */
  81 #define VNC_MAX_WIDTH 2560
  82 #define VNC_MAX_HEIGHT 2048
  83
  84 /* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
  85 #define VNC_DIRTY_BITS (VNC_MAX_WIDTH / 16)
  86
  87 #define VNC_STAT_RECT  64
  88 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
  89 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
  90
  91 #define VNC_AUTH_CHALLENGE_SIZE 16
  92
  93 typedef struct VncDisplay VncDisplay;
  94
  95 #ifdef CONFIG_VNC_TLS
  96 #include "vnc-tls.h"
  97 #include "vnc-auth-vencrypt.h"
  98 #endif
  99 #ifdef CONFIG_VNC_SASL
 100 #include "vnc-auth-sasl.h"
 101 #endif
 102
 103 struct VncRectStat
 104 {
 105     /* time of last 10 updates, to find update frequency */
 106     struct timeval times[10];
 107     int idx;
 108
 109     double freq;        /* Update frequency (in Hz) */
 110     bool updated;       /* Already updated during this refresh */
 111 };
 112
 113 typedef struct VncRectStat VncRectStat;
 114
 115 struct VncSurface
 116 {
 117     struct timeval last_freq_check;
 118     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_MAX_WIDTH / 16);
 119     VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
 120     pixman_image_t *fb;
 121     pixman_format_code_t format;
 122 };
 123
 124 typedef enum VncShareMode {
 125     VNC_SHARE_MODE_CONNECTING = 1,
 126     VNC_SHARE_MODE_SHARED,
 127     VNC_SHARE_MODE_EXCLUSIVE,
 128     VNC_SHARE_MODE_DISCONNECTED,
 129 } VncShareMode;
 130
 131 typedef enum VncSharePolicy {
 132     VNC_SHARE_POLICY_IGNORE = 1,
 133     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 134     VNC_SHARE_POLICY_FORCE_SHARED,
 135 } VncSharePolicy;
 136
 137 struct VncDisplay
 138 {
 139     QTAILQ_HEAD(, VncState) clients;
 140     int num_exclusive;
 141     VncSharePolicy share_policy;
 142     QEMUTimer *timer;
 143     int timer_interval;
 144     int lsock;
 145     DisplayState *ds;
 146     kbd_layout_t *kbd_layout;
 147     int lock_key_sync;
 148     QemuMutex mutex;
 149
 150     QEMUCursor *cursor;
 151     int cursor_msize;
 152     uint8_t *cursor_mask;
 153
 154     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 155     pixman_image_t *server;    /* vnc server surface */
 156
 157     char *display;
 158     char *password;
 159     time_t expires;
 160     int auth;
 161     bool lossy;
 162     bool non_adaptive;
 163 #ifdef CONFIG_VNC_TLS
 164     int subauth; /* Used by VeNCrypt */
 165     VncDisplayTLS tls;
 166 #endif
 167 #ifdef CONFIG_VNC_SASL
 168     VncDisplaySASL sasl;
 169 #endif
 170 };
 171
 172 typedef struct VncTight {
 173     int type;
 174     uint8_t quality;
 175     uint8_t compression;
 176     uint8_t pixel24;
 177     Buffer tight;
 178     Buffer tmp;
 179     Buffer zlib;
 180     Buffer gradient;
 181 #ifdef CONFIG_VNC_JPEG
 182     Buffer jpeg;
 183 #endif
 184 #ifdef CONFIG_VNC_PNG
 185     Buffer png;
 186 #endif
 187     int levels[4];
 188     z_stream stream[4];
 189 } VncTight;
 190
 191 typedef struct VncHextile {
 192     VncSendHextileTile *send_tile;
 193 } VncHextile;
 194
 195 typedef struct VncZlib {
 196     Buffer zlib;
 197     Buffer tmp;
 198     z_stream stream;
 199     int level;
 200 } VncZlib;
 201
 202 typedef struct VncZrle {
 203     int type;
 204     Buffer fb;
 205     Buffer zrle;
 206     Buffer tmp;
 207     Buffer zlib;
 208     z_stream stream;
 209     VncPalette palette;
 210 } VncZrle;
 211
 212 typedef struct VncZywrle {
 213     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 214 } VncZywrle;
 215
 216 struct VncRect
 217 {
 218     int x;
 219     int y;
 220     int w;
 221     int h;
 222 };
 223
 224 struct VncRectEntry
 225 {
 226     struct VncRect rect;
 227     QLIST_ENTRY(VncRectEntry) next;
 228 };
 229
 230 struct VncJob
 231 {
 232     VncState *vs;
 233
 234     QLIST_HEAD(, VncRectEntry) rectangles;
 235     QTAILQ_ENTRY(VncJob) next;
 236 };
 237
 238 struct VncState
 239 {
 240     int csock;
 241
 242     DisplayState *ds;
 243     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 244     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 245                            * vnc-jobs-async.c */
 246
 247     VncDisplay *vd;
 248     int need_update;
 249     int force_update;
 250     uint32_t features;
 251     int absolute;
 252     int last_x;
 253     int last_y;
 254     int client_width;
 255     int client_height;
 256     VncShareMode share_mode;
 257
 258     uint32_t vnc_encoding;
 259
 260     int major;
 261     int minor;
 262
 263     int auth;
 264     char challenge[VNC_AUTH_CHALLENGE_SIZE];
 265 #ifdef CONFIG_VNC_TLS
 266     int subauth; /* Used by VeNCrypt */
 267     VncStateTLS tls;
 268 #endif
 269 #ifdef CONFIG_VNC_SASL
 270     VncStateSASL sasl;
 271 #endif
 272
 273     QObject *info;
 274
 275     Buffer output;
 276     Buffer input;
 277     /* current output mode information */
 278     VncWritePixels *write_pixels;
 279     PixelFormat client_pf;
 280     pixman_format_code_t client_format;
 281     bool client_be;
 282
 283     CaptureVoiceOut *audio_cap;
 284     struct audsettings as;
 285
 286     VncReadEvent *read_handler;
 287     size_t read_handler_expect;
 288     /* input */
 289     uint8_t modifiers_state[256];
 290     QEMUPutLEDEntry *led;
 291
 292     bool abort;
 293     QemuMutex output_mutex;
 294     QEMUBH *bh;
 295     Buffer jobs_buffer;
 296
 297     /* Encoding specific, if you add something here, don't forget to
 298      *  update vnc_async_encoding_start()
 299      */
 300     VncTight tight;
 301     VncZlib zlib;
 302     VncHextile hextile;
 303     VncZrle zrle;
 304     VncZywrle zywrle;
 305
 306     Notifier mouse_mode_notifier;
 307
 308     QTAILQ_ENTRY(VncState) next;
 309 };
 310
 311
 312 /*****************************************************************************
 313  *
 314  * Authentication modes
 315  *
 316  *****************************************************************************/
 317
 318 enum {
 319     VNC_AUTH_INVALID = 0,
 320     VNC_AUTH_NONE = 1,
 321     VNC_AUTH_VNC = 2,
 322     VNC_AUTH_RA2 = 5,
 323     VNC_AUTH_RA2NE = 6,
 324     VNC_AUTH_TIGHT = 16,
 325     VNC_AUTH_ULTRA = 17,
 326     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 327     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 328     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 329 };
 330
 331 enum {
 332     VNC_AUTH_VENCRYPT_PLAIN = 256,
 333     VNC_AUTH_VENCRYPT_TLSNONE = 257,
 334     VNC_AUTH_VENCRYPT_TLSVNC = 258,
 335     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 336     VNC_AUTH_VENCRYPT_X509NONE = 260,
 337     VNC_AUTH_VENCRYPT_X509VNC = 261,
 338     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 339     VNC_AUTH_VENCRYPT_X509SASL = 263,
 340     VNC_AUTH_VENCRYPT_TLSSASL = 264,
 341 };
 342
 343
 344 /*****************************************************************************
 345  *
 346  * Encoding types
 347  *
 348  *****************************************************************************/
 349
 350 #define VNC_ENCODING_RAW                  0x00000000
 351 #define VNC_ENCODING_COPYRECT             0x00000001
 352 #define VNC_ENCODING_RRE                  0x00000002
 353 #define VNC_ENCODING_CORRE                0x00000004
 354 #define VNC_ENCODING_HEXTILE              0x00000005
 355 #define VNC_ENCODING_ZLIB                 0x00000006
 356 #define VNC_ENCODING_TIGHT                0x00000007
 357 #define VNC_ENCODING_ZLIBHEX              0x00000008
 358 #define VNC_ENCODING_TRLE                 0x0000000f
 359 #define VNC_ENCODING_ZRLE                 0x00000010
 360 #define VNC_ENCODING_ZYWRLE               0x00000011
 361 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 362 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 363 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 364 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 365 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 366 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 367 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 368 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 369 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 370 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 371 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 372 #define VNC_ENCODING_WMVi                 0x574D5669
 373
 374 /*****************************************************************************
 375  *
 376  * Other tight constants
 377  *
 378  *****************************************************************************/
 379
 380 /*
 381  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 382  */
 383
 384 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 385 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 386 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 387 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 388 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 389 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 390 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 391 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 392
 393 /*****************************************************************************
 394  *
 395  * Features
 396  *
 397  *****************************************************************************/
 398
 399 #define VNC_FEATURE_RESIZE                   0
 400 #define VNC_FEATURE_HEXTILE                  1
 401 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 402 #define VNC_FEATURE_WMVI                     3
 403 #define VNC_FEATURE_TIGHT                    4
 404 #define VNC_FEATURE_ZLIB                     5
 405 #define VNC_FEATURE_COPYRECT                 6
 406 #define VNC_FEATURE_RICH_CURSOR              7
 407 #define VNC_FEATURE_TIGHT_PNG                8
 408 #define VNC_FEATURE_ZRLE                     9
 409 #define VNC_FEATURE_ZYWRLE                  10
 410
 411 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 412 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 413 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 414 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 415 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 416 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 417 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 418 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 419 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 420 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 421 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 422
 423
 424 /* Client -> Server message IDs */
 425 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 426 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
 427 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 428 #define VNC_MSG_CLIENT_KEY_EVENT                  4
 429 #define VNC_MSG_CLIENT_POINTER_EVENT              5
 430 #define VNC_MSG_CLIENT_CUT_TEXT                   6
 431 #define VNC_MSG_CLIENT_VMWARE_0                   127
 432 #define VNC_MSG_CLIENT_CALL_CONTROL               249
 433 #define VNC_MSG_CLIENT_XVP                        250
 434 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 435 #define VNC_MSG_CLIENT_TIGHT                      252
 436 #define VNC_MSG_CLIENT_GII                        253
 437 #define VNC_MSG_CLIENT_VMWARE_1                   254
 438 #define VNC_MSG_CLIENT_QEMU                       255
 439
 440 /* Server -> Client message IDs */
 441 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 442 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 443 #define VNC_MSG_SERVER_BELL                       2
 444 #define VNC_MSG_SERVER_CUT_TEXT                   3
 445 #define VNC_MSG_SERVER_VMWARE_0                   127
 446 #define VNC_MSG_SERVER_CALL_CONTROL               249
 447 #define VNC_MSG_SERVER_XVP                        250
 448 #define VNC_MSG_SERVER_TIGHT                      252
 449 #define VNC_MSG_SERVER_GII                        253
 450 #define VNC_MSG_SERVER_VMWARE_1                   254
 451 #define VNC_MSG_SERVER_QEMU                       255
 452
 453
 454
 455 /* QEMU client -> server message IDs */
 456 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 457 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 458
 459 /* QEMU server -> client message IDs */
 460 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
 461
 462
 463
 464 /* QEMU client -> server audio message IDs */
 465 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 466 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 467 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 468
 469 /* QEMU server -> client audio message IDs */
 470 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 471 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 472 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 473
 474
 475 /*****************************************************************************
 476  *
 477  * Internal APIs
 478  *
 479  *****************************************************************************/
 480
 481 /* Event loop functions */
 482 void vnc_client_read(void *opaque);
 483 void vnc_client_write(void *opaque);
 484
 485 long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 486 long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 487
 488 /* Protocol I/O functions */
 489 void vnc_write(VncState *vs, const void *data, size_t len);
 490 void vnc_write_u32(VncState *vs, uint32_t value);
 491 void vnc_write_s32(VncState *vs, int32_t value);
 492 void vnc_write_u16(VncState *vs, uint16_t value);
 493 void vnc_write_u8(VncState *vs, uint8_t value);
 494 void vnc_flush(VncState *vs);
 495 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 496
 497
 498 /* Buffer I/O functions */
 499 uint32_t read_u32(uint8_t *data, size_t offset);
 500
 501 /* Protocol stage functions */
 502 void vnc_client_error(VncState *vs);
 503 int vnc_client_io_error(VncState *vs, int ret, int last_errno);
 504
 505 void start_client_init(VncState *vs);
 506 void start_auth_vnc(VncState *vs);
 507
 508 /* Buffer management */
 509 void buffer_reserve(Buffer *buffer, size_t len);
 510 void buffer_reset(Buffer *buffer);
 511 void buffer_free(Buffer *buffer);
 512 void buffer_append(Buffer *buffer, const void *data, size_t len);
 513
 514
 515 /* Misc helpers */
 516
 517 char *vnc_socket_local_addr(const char *format, int fd);
 518 char *vnc_socket_remote_addr(const char *format, int fd);
 519
 520 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 521     return (vs->features & (1 << feature));
 522 }
 523
 524 /* Framebuffer */
 525 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 526                             int32_t encoding);
 527
 528 /* server fb is in PIXMAN_x8r8g8b8 */
 529 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 530 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 531 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 532
 533 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 534 int vnc_server_fb_stride(VncDisplay *vd);
 535
 536 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 537 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 538 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 539
 540 /* Encodings */
 541 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 542
 543 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 544
 545 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 546                                          int y, int w, int h);
 547 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 548
 549 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 550 void vnc_zlib_zfree(void *x, void *addr);
 551 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 552 void vnc_zlib_clear(VncState *vs);
 553
 554 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 555 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 556                                           int w, int h);
 557 void vnc_tight_clear(VncState *vs);
 558
 559 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 560 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 561 void vnc_zrle_clear(VncState *vs);
 562
 563 #endif /* __QEMU_VNC_H */