LXR qemu/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 "ui/console.h"
  34#include "monitor/monitor.h"
  35#include "audio/audio.h"
  36#include "qemu/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
  58typedef struct Buffer
  59{
  60    size_t capacity;
  61    size_t offset;
  62    uint8_t *buffer;
  63} Buffer;
  64
  65typedef struct VncState VncState;
  66typedef struct VncJob VncJob;
  67typedef struct VncRect VncRect;
  68typedef struct VncRectEntry VncRectEntry;
  69
  70typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  71
  72typedef void VncWritePixels(VncState *vs, void *data, int size);
  73
  74typedef 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
  93typedef 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#ifdef CONFIG_VNC_WS
 103#include "vnc-ws.h"
 104#endif
 105
 106struct VncRectStat
 107{
 108    /* time of last 10 updates, to find update frequency */
 109    struct timeval times[10];
 110    int idx;
 111
 112    double freq;        /* Update frequency (in Hz) */
 113    bool updated;       /* Already updated during this refresh */
 114};
 115
 116typedef struct VncRectStat VncRectStat;
 117
 118struct VncSurface
 119{
 120    struct timeval last_freq_check;
 121    DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_MAX_WIDTH / 16);
 122    VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
 123    pixman_image_t *fb;
 124    pixman_format_code_t format;
 125};
 126
 127typedef enum VncShareMode {
 128    VNC_SHARE_MODE_CONNECTING = 1,
 129    VNC_SHARE_MODE_SHARED,
 130    VNC_SHARE_MODE_EXCLUSIVE,
 131    VNC_SHARE_MODE_DISCONNECTED,
 132} VncShareMode;
 133
 134typedef enum VncSharePolicy {
 135    VNC_SHARE_POLICY_IGNORE = 1,
 136    VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 137    VNC_SHARE_POLICY_FORCE_SHARED,
 138} VncSharePolicy;
 139
 140struct VncDisplay
 141{
 142    QTAILQ_HEAD(, VncState) clients;
 143    int num_exclusive;
 144    VncSharePolicy share_policy;
 145    int lsock;
 146#ifdef CONFIG_VNC_WS
 147    int lwebsock;
 148    bool websocket;
 149    char *ws_display;
 150#endif
 151    DisplaySurface *ds;
 152    DisplayChangeListener dcl;
 153    kbd_layout_t *kbd_layout;
 154    int lock_key_sync;
 155    QemuMutex mutex;
 156
 157    QEMUCursor *cursor;
 158    int cursor_msize;
 159    uint8_t *cursor_mask;
 160
 161    struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 162    pixman_image_t *server;    /* vnc server surface */
 163
 164    char *display;
 165    char *password;
 166    time_t expires;
 167    int auth;
 168    bool lossy;
 169    bool non_adaptive;
 170#ifdef CONFIG_VNC_TLS
 171    int subauth; /* Used by VeNCrypt */
 172    VncDisplayTLS tls;
 173#endif
 174#ifdef CONFIG_VNC_SASL
 175    VncDisplaySASL sasl;
 176#endif
 177};
 178
 179typedef struct VncTight {
 180    int type;
 181    uint8_t quality;
 182    uint8_t compression;
 183    uint8_t pixel24;
 184    Buffer tight;
 185    Buffer tmp;
 186    Buffer zlib;
 187    Buffer gradient;
 188#ifdef CONFIG_VNC_JPEG
 189    Buffer jpeg;
 190#endif
 191#ifdef CONFIG_VNC_PNG
 192    Buffer png;
 193#endif
 194    int levels[4];
 195    z_stream stream[4];
 196} VncTight;
 197
 198typedef struct VncHextile {
 199    VncSendHextileTile *send_tile;
 200} VncHextile;
 201
 202typedef struct VncZlib {
 203    Buffer zlib;
 204    Buffer tmp;
 205    z_stream stream;
 206    int level;
 207} VncZlib;
 208
 209typedef struct VncZrle {
 210    int type;
 211    Buffer fb;
 212    Buffer zrle;
 213    Buffer tmp;
 214    Buffer zlib;
 215    z_stream stream;
 216    VncPalette palette;
 217} VncZrle;
 218
 219typedef struct VncZywrle {
 220    int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 221} VncZywrle;
 222
 223struct VncRect
 224{
 225    int x;
 226    int y;
 227    int w;
 228    int h;
 229};
 230
 231struct VncRectEntry
 232{
 233    struct VncRect rect;
 234    QLIST_ENTRY(VncRectEntry) next;
 235};
 236
 237struct VncJob
 238{
 239    VncState *vs;
 240
 241    QLIST_HEAD(, VncRectEntry) rectangles;
 242    QTAILQ_ENTRY(VncJob) next;
 243};
 244
 245struct VncState
 246{
 247    int csock;
 248
 249    DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 250    uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 251                           * vnc-jobs-async.c */
 252
 253    VncDisplay *vd;
 254    int need_update;
 255    int force_update;
 256    uint32_t features;
 257    int absolute;
 258    int last_x;
 259    int last_y;
 260    int client_width;
 261    int client_height;
 262    VncShareMode share_mode;
 263
 264    uint32_t vnc_encoding;
 265
 266    int major;
 267    int minor;
 268
 269    int auth;
 270    char challenge[VNC_AUTH_CHALLENGE_SIZE];
 271#ifdef CONFIG_VNC_TLS
 272    int subauth; /* Used by VeNCrypt */
 273    VncStateTLS tls;
 274#endif
 275#ifdef CONFIG_VNC_SASL
 276    VncStateSASL sasl;
 277#endif
 278#ifdef CONFIG_VNC_WS
 279#ifdef CONFIG_VNC_TLS
 280    VncStateTLS ws_tls;
 281#endif /* CONFIG_VNC_TLS */
 282    bool encode_ws;
 283    bool websocket;
 284#endif /* CONFIG_VNC_WS */
 285
 286    QObject *info;
 287
 288    Buffer output;
 289    Buffer input;
 290#ifdef CONFIG_VNC_WS
 291    Buffer ws_input;
 292    Buffer ws_output;
 293#endif
 294    /* current output mode information */
 295    VncWritePixels *write_pixels;
 296    PixelFormat client_pf;
 297    pixman_format_code_t client_format;
 298    bool client_be;
 299
 300    CaptureVoiceOut *audio_cap;
 301    struct audsettings as;
 302
 303    VncReadEvent *read_handler;
 304    size_t read_handler_expect;
 305    /* input */
 306    uint8_t modifiers_state[256];
 307    QEMUPutLEDEntry *led;
 308
 309    bool abort;
 310    bool initialized;
 311    QemuMutex output_mutex;
 312    QEMUBH *bh;
 313    Buffer jobs_buffer;
 314
 315    /* Encoding specific, if you add something here, don't forget to
 316     *  update vnc_async_encoding_start()
 317     */
 318    VncTight tight;
 319    VncZlib zlib;
 320    VncHextile hextile;
 321    VncZrle zrle;
 322    VncZywrle zywrle;
 323
 324    Notifier mouse_mode_notifier;
 325
 326    QTAILQ_ENTRY(VncState) next;
 327};
 328
 329
 330/*****************************************************************************
 331 *
 332 * Authentication modes
 333 *
 334 *****************************************************************************/
 335
 336enum {
 337    VNC_AUTH_INVALID = 0,
 338    VNC_AUTH_NONE = 1,
 339    VNC_AUTH_VNC = 2,
 340    VNC_AUTH_RA2 = 5,
 341    VNC_AUTH_RA2NE = 6,
 342    VNC_AUTH_TIGHT = 16,
 343    VNC_AUTH_ULTRA = 17,
 344    VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 345    VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 346    VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 347};
 348
 349enum {
 350    VNC_AUTH_VENCRYPT_PLAIN = 256,
 351    VNC_AUTH_VENCRYPT_TLSNONE = 257,
 352    VNC_AUTH_VENCRYPT_TLSVNC = 258,
 353    VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 354    VNC_AUTH_VENCRYPT_X509NONE = 260,
 355    VNC_AUTH_VENCRYPT_X509VNC = 261,
 356    VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 357    VNC_AUTH_VENCRYPT_X509SASL = 263,
 358    VNC_AUTH_VENCRYPT_TLSSASL = 264,
 359};
 360
 361
 362/*****************************************************************************
 363 *
 364 * Encoding types
 365 *
 366 *****************************************************************************/
 367
 368#define VNC_ENCODING_RAW                  0x00000000
 369#define VNC_ENCODING_COPYRECT             0x00000001
 370#define VNC_ENCODING_RRE                  0x00000002
 371#define VNC_ENCODING_CORRE                0x00000004
 372#define VNC_ENCODING_HEXTILE              0x00000005
 373#define VNC_ENCODING_ZLIB                 0x00000006
 374#define VNC_ENCODING_TIGHT                0x00000007
 375#define VNC_ENCODING_ZLIBHEX              0x00000008
 376#define VNC_ENCODING_TRLE                 0x0000000f
 377#define VNC_ENCODING_ZRLE                 0x00000010
 378#define VNC_ENCODING_ZYWRLE               0x00000011
 379#define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 380#define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 381#define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 382#define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 383#define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 384#define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 385#define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 386#define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 387#define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 388#define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 389#define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 390#define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
 391#define VNC_ENCODING_WMVi                 0x574D5669
 392
 393/*****************************************************************************
 394 *
 395 * Other tight constants
 396 *
 397 *****************************************************************************/
 398
 399/*
 400 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 401 */
 402
 403#define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 404#define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 405#define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 406#define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 407#define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 408#define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 409#define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 410#define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 411
 412/*****************************************************************************
 413 *
 414 * Features
 415 *
 416 *****************************************************************************/
 417
 418#define VNC_FEATURE_RESIZE                   0
 419#define VNC_FEATURE_HEXTILE                  1
 420#define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 421#define VNC_FEATURE_WMVI                     3
 422#define VNC_FEATURE_TIGHT                    4
 423#define VNC_FEATURE_ZLIB                     5
 424#define VNC_FEATURE_COPYRECT                 6
 425#define VNC_FEATURE_RICH_CURSOR              7
 426#define VNC_FEATURE_TIGHT_PNG                8
 427#define VNC_FEATURE_ZRLE                     9
 428#define VNC_FEATURE_ZYWRLE                  10
 429#define VNC_FEATURE_LED_STATE               11
 430
 431#define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 432#define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 433#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 434#define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 435#define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 436#define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 437#define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 438#define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 439#define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 440#define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 441#define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 442#define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
 443
 444
 445/* Client -> Server message IDs */
 446#define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 447#define VNC_MSG_CLIENT_SET_ENCODINGS              2
 448#define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 449#define VNC_MSG_CLIENT_KEY_EVENT                  4
 450#define VNC_MSG_CLIENT_POINTER_EVENT              5
 451#define VNC_MSG_CLIENT_CUT_TEXT                   6
 452#define VNC_MSG_CLIENT_VMWARE_0                   127
 453#define VNC_MSG_CLIENT_CALL_CONTROL               249
 454#define VNC_MSG_CLIENT_XVP                        250
 455#define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 456#define VNC_MSG_CLIENT_TIGHT                      252
 457#define VNC_MSG_CLIENT_GII                        253
 458#define VNC_MSG_CLIENT_VMWARE_1                   254
 459#define VNC_MSG_CLIENT_QEMU                       255
 460
 461/* Server -> Client message IDs */
 462#define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 463#define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 464#define VNC_MSG_SERVER_BELL                       2
 465#define VNC_MSG_SERVER_CUT_TEXT                   3
 466#define VNC_MSG_SERVER_VMWARE_0                   127
 467#define VNC_MSG_SERVER_CALL_CONTROL               249
 468#define VNC_MSG_SERVER_XVP                        250
 469#define VNC_MSG_SERVER_TIGHT                      252
 470#define VNC_MSG_SERVER_GII                        253
 471#define VNC_MSG_SERVER_VMWARE_1                   254
 472#define VNC_MSG_SERVER_QEMU                       255
 473
 474
 475
 476/* QEMU client -> server message IDs */
 477#define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 478#define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 479
 480/* QEMU server -> client message IDs */
 481#define VNC_MSG_SERVER_QEMU_AUDIO                 1
 482
 483
 484
 485/* QEMU client -> server audio message IDs */
 486#define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 487#define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 488#define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 489
 490/* QEMU server -> client audio message IDs */
 491#define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 492#define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 493#define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 494
 495
 496/*****************************************************************************
 497 *
 498 * Internal APIs
 499 *
 500 *****************************************************************************/
 501
 502/* Event loop functions */
 503void vnc_client_read(void *opaque);
 504void vnc_client_write(void *opaque);
 505
 506long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 507long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 508
 509/* Protocol I/O functions */
 510void vnc_write(VncState *vs, const void *data, size_t len);
 511void vnc_write_u32(VncState *vs, uint32_t value);
 512void vnc_write_s32(VncState *vs, int32_t value);
 513void vnc_write_u16(VncState *vs, uint16_t value);
 514void vnc_write_u8(VncState *vs, uint8_t value);
 515void vnc_flush(VncState *vs);
 516void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 517void vnc_disconnect_finish(VncState *vs);
 518void vnc_init_state(VncState *vs);
 519
 520
 521/* Buffer I/O functions */
 522uint32_t read_u32(uint8_t *data, size_t offset);
 523
 524/* Protocol stage functions */
 525void vnc_client_error(VncState *vs);
 526int vnc_client_io_error(VncState *vs, int ret, int last_errno);
 527
 528void start_client_init(VncState *vs);
 529void start_auth_vnc(VncState *vs);
 530
 531/* Buffer management */
 532void buffer_reserve(Buffer *buffer, size_t len);
 533void buffer_reset(Buffer *buffer);
 534void buffer_free(Buffer *buffer);
 535void buffer_append(Buffer *buffer, const void *data, size_t len);
 536void buffer_advance(Buffer *buf, size_t len);
 537uint8_t *buffer_end(Buffer *buffer);
 538
 539
 540/* Misc helpers */
 541
 542char *vnc_socket_local_addr(const char *format, int fd);
 543char *vnc_socket_remote_addr(const char *format, int fd);
 544
 545static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 546    return (vs->features & (1 << feature));
 547}
 548
 549/* Framebuffer */
 550void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 551                            int32_t encoding);
 552
 553/* server fb is in PIXMAN_x8r8g8b8 */
 554#define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 555#define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 556#define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 557
 558void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 559int vnc_server_fb_stride(VncDisplay *vd);
 560
 561void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 562double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 563void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 564
 565/* Encodings */
 566int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 567
 568int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 569
 570int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 571                                         int y, int w, int h);
 572void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 573
 574void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 575void vnc_zlib_zfree(void *x, void *addr);
 576int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 577void vnc_zlib_clear(VncState *vs);
 578
 579int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 580int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 581                                          int w, int h);
 582void vnc_tight_clear(VncState *vs);
 583
 584int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 585int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 586void vnc_zrle_clear(VncState *vs);
 587
 588#endif /* __QEMU_VNC_H */
 589