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 "audio/audio.h"
  35#include "qemu/bitmap.h"
  36#include "crypto/tlssession.h"
  37#include "qemu/buffer.h"
  38#include "io/channel-socket.h"
  39#include "io/channel-tls.h"
  40#include <zlib.h>
  41
  42#include "keymaps.h"
  43#include "vnc-palette.h"
  44#include "vnc-enc-zrle.h"
  45#include "qapi-types.h"
  46
  47// #define _VNC_DEBUG 1
  48
  49#ifdef _VNC_DEBUG
  50#define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  51#else
  52#define VNC_DEBUG(fmt, ...) do { } while (0)
  53#endif
  54
  55/*****************************************************************************
  56 *
  57 * Core data structures
  58 *
  59 *****************************************************************************/
  60
  61typedef struct VncState VncState;
  62typedef struct VncJob VncJob;
  63typedef struct VncRect VncRect;
  64typedef struct VncRectEntry VncRectEntry;
  65
  66typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  67
  68typedef void VncWritePixels(VncState *vs, void *data, int size);
  69
  70typedef void VncSendHextileTile(VncState *vs,
  71                                int x, int y, int w, int h,
  72                                void *last_bg,
  73                                void *last_fg,
  74                                int *has_bg, int *has_fg);
  75
  76/* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
  77 * by one bit in the dirty bitmap, should be a power of 2 */
  78#define VNC_DIRTY_PIXELS_PER_BIT 16
  79
  80/* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
  81
  82#define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
  83#define VNC_MAX_HEIGHT 2048
  84
  85/* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
  86#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
  87
  88/* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
  89 * VNC_DIRTY_BITS due to alignment */
  90#define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
  91
  92#define VNC_STAT_RECT  64
  93#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
  94#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
  95
  96#define VNC_AUTH_CHALLENGE_SIZE 16
  97
  98typedef struct VncDisplay VncDisplay;
  99
 100#include "vnc-auth-vencrypt.h"
 101#ifdef CONFIG_VNC_SASL
 102#include "vnc-auth-sasl.h"
 103#endif
 104#include "vnc-ws.h"
 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],
 122                   VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT);
 123    VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
 124    pixman_image_t *fb;
 125    pixman_format_code_t format;
 126};
 127
 128typedef enum VncShareMode {
 129    VNC_SHARE_MODE_CONNECTING = 1,
 130    VNC_SHARE_MODE_SHARED,
 131    VNC_SHARE_MODE_EXCLUSIVE,
 132    VNC_SHARE_MODE_DISCONNECTED,
 133} VncShareMode;
 134
 135typedef enum VncSharePolicy {
 136    VNC_SHARE_POLICY_IGNORE = 1,
 137    VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 138    VNC_SHARE_POLICY_FORCE_SHARED,
 139} VncSharePolicy;
 140
 141struct VncDisplay
 142{
 143    QTAILQ_HEAD(, VncState) clients;
 144    int num_connecting;
 145    int num_shared;
 146    int num_exclusive;
 147    int connections_limit;
 148    VncSharePolicy share_policy;
 149    QIOChannelSocket *lsock;
 150    guint lsock_tag;
 151    QIOChannelSocket *lwebsock;
 152    guint lwebsock_tag;
 153    DisplaySurface *ds;
 154    DisplayChangeListener dcl;
 155    kbd_layout_t *kbd_layout;
 156    int lock_key_sync;
 157    int key_delay_ms;
 158    QemuMutex mutex;
 159
 160    QEMUCursor *cursor;
 161    int cursor_msize;
 162    uint8_t *cursor_mask;
 163
 164    struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 165    pixman_image_t *server;    /* vnc server surface */
 166
 167    const char *id;
 168    QTAILQ_ENTRY(VncDisplay) next;
 169    bool is_unix;
 170    char *password;
 171    time_t expires;
 172    int auth;
 173    int subauth; /* Used by VeNCrypt */
 174    int ws_auth; /* Used by websockets */
 175    int ws_subauth; /* Used by websockets */
 176    bool lossy;
 177    bool non_adaptive;
 178    QCryptoTLSCreds *tlscreds;
 179    char *tlsaclname;
 180#ifdef CONFIG_VNC_SASL
 181    VncDisplaySASL sasl;
 182#endif
 183};
 184
 185typedef struct VncTight {
 186    int type;
 187    uint8_t quality;
 188    uint8_t compression;
 189    uint8_t pixel24;
 190    Buffer tight;
 191    Buffer tmp;
 192    Buffer zlib;
 193    Buffer gradient;
 194#ifdef CONFIG_VNC_JPEG
 195    Buffer jpeg;
 196#endif
 197#ifdef CONFIG_VNC_PNG
 198    Buffer png;
 199#endif
 200    int levels[4];
 201    z_stream stream[4];
 202} VncTight;
 203
 204typedef struct VncHextile {
 205    VncSendHextileTile *send_tile;
 206} VncHextile;
 207
 208typedef struct VncZlib {
 209    Buffer zlib;
 210    Buffer tmp;
 211    z_stream stream;
 212    int level;
 213} VncZlib;
 214
 215typedef struct VncZrle {
 216    int type;
 217    Buffer fb;
 218    Buffer zrle;
 219    Buffer tmp;
 220    Buffer zlib;
 221    z_stream stream;
 222    VncPalette palette;
 223} VncZrle;
 224
 225typedef struct VncZywrle {
 226    int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 227} VncZywrle;
 228
 229struct VncRect
 230{
 231    int x;
 232    int y;
 233    int w;
 234    int h;
 235};
 236
 237struct VncRectEntry
 238{
 239    struct VncRect rect;
 240    QLIST_ENTRY(VncRectEntry) next;
 241};
 242
 243struct VncJob
 244{
 245    VncState *vs;
 246
 247    QLIST_HEAD(, VncRectEntry) rectangles;
 248    QTAILQ_ENTRY(VncJob) next;
 249};
 250
 251struct VncState
 252{
 253    QIOChannelSocket *sioc; /* The underlying socket */
 254    QIOChannel *ioc; /* The channel currently used for I/O */
 255    guint ioc_tag;
 256    gboolean disconnecting;
 257
 258    DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 259    uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 260                           * vnc-jobs-async.c */
 261
 262    VncDisplay *vd;
 263    int need_update;
 264    int force_update;
 265    int has_dirty;
 266    uint32_t features;
 267    int absolute;
 268    int last_x;
 269    int last_y;
 270    uint32_t last_bmask;
 271    int client_width;
 272    int client_height;
 273    VncShareMode share_mode;
 274
 275    uint32_t vnc_encoding;
 276
 277    int major;
 278    int minor;
 279
 280    int auth;
 281    int subauth; /* Used by VeNCrypt */
 282    char challenge[VNC_AUTH_CHALLENGE_SIZE];
 283    QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
 284#ifdef CONFIG_VNC_SASL
 285    VncStateSASL sasl;
 286#endif
 287    bool encode_ws;
 288    bool websocket;
 289
 290    VncClientInfo *info;
 291
 292    Buffer output;
 293    Buffer input;
 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    QemuMutex output_mutex;
 311    QEMUBH *bh;
 312    Buffer jobs_buffer;
 313
 314    /* Encoding specific, if you add something here, don't forget to
 315     *  update vnc_async_encoding_start()
 316     */
 317    VncTight tight;
 318    VncZlib zlib;
 319    VncHextile hextile;
 320    VncZrle zrle;
 321    VncZywrle zywrle;
 322
 323    Notifier mouse_mode_notifier;
 324
 325    QTAILQ_ENTRY(VncState) next;
 326};
 327
 328
 329/*****************************************************************************
 330 *
 331 * Authentication modes
 332 *
 333 *****************************************************************************/
 334
 335enum {
 336    VNC_AUTH_INVALID = 0,
 337    VNC_AUTH_NONE = 1,
 338    VNC_AUTH_VNC = 2,
 339    VNC_AUTH_RA2 = 5,
 340    VNC_AUTH_RA2NE = 6,
 341    VNC_AUTH_TIGHT = 16,
 342    VNC_AUTH_ULTRA = 17,
 343    VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 344    VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 345    VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 346};
 347
 348enum {
 349    VNC_AUTH_VENCRYPT_PLAIN = 256,
 350    VNC_AUTH_VENCRYPT_TLSNONE = 257,
 351    VNC_AUTH_VENCRYPT_TLSVNC = 258,
 352    VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 353    VNC_AUTH_VENCRYPT_X509NONE = 260,
 354    VNC_AUTH_VENCRYPT_X509VNC = 261,
 355    VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 356    VNC_AUTH_VENCRYPT_X509SASL = 263,
 357    VNC_AUTH_VENCRYPT_TLSSASL = 264,
 358};
 359
 360
 361/*****************************************************************************
 362 *
 363 * Encoding types
 364 *
 365 *****************************************************************************/
 366
 367#define VNC_ENCODING_RAW                  0x00000000
 368#define VNC_ENCODING_COPYRECT             0x00000001
 369#define VNC_ENCODING_RRE                  0x00000002
 370#define VNC_ENCODING_CORRE                0x00000004
 371#define VNC_ENCODING_HEXTILE              0x00000005
 372#define VNC_ENCODING_ZLIB                 0x00000006
 373#define VNC_ENCODING_TIGHT                0x00000007
 374#define VNC_ENCODING_ZLIBHEX              0x00000008
 375#define VNC_ENCODING_TRLE                 0x0000000f
 376#define VNC_ENCODING_ZRLE                 0x00000010
 377#define VNC_ENCODING_ZYWRLE               0x00000011
 378#define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 379#define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 380#define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 381#define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 382#define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 383#define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 384#define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 385#define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 386#define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 387#define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 388#define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 389#define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
 390#define VNC_ENCODING_WMVi                 0x574D5669
 391
 392/*****************************************************************************
 393 *
 394 * Other tight constants
 395 *
 396 *****************************************************************************/
 397
 398/*
 399 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 400 */
 401
 402#define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 403#define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 404#define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 405#define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 406#define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 407#define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 408#define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 409#define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 410
 411/*****************************************************************************
 412 *
 413 * Features
 414 *
 415 *****************************************************************************/
 416
 417#define VNC_FEATURE_RESIZE                   0
 418#define VNC_FEATURE_HEXTILE                  1
 419#define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 420#define VNC_FEATURE_WMVI                     3
 421#define VNC_FEATURE_TIGHT                    4
 422#define VNC_FEATURE_ZLIB                     5
 423#define VNC_FEATURE_COPYRECT                 6
 424#define VNC_FEATURE_RICH_CURSOR              7
 425#define VNC_FEATURE_TIGHT_PNG                8
 426#define VNC_FEATURE_ZRLE                     9
 427#define VNC_FEATURE_ZYWRLE                  10
 428#define VNC_FEATURE_LED_STATE               11
 429
 430#define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 431#define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 432#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 433#define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 434#define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 435#define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 436#define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 437#define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 438#define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 439#define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 440#define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 441#define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
 442
 443
 444/* Client -> Server message IDs */
 445#define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 446#define VNC_MSG_CLIENT_SET_ENCODINGS              2
 447#define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 448#define VNC_MSG_CLIENT_KEY_EVENT                  4
 449#define VNC_MSG_CLIENT_POINTER_EVENT              5
 450#define VNC_MSG_CLIENT_CUT_TEXT                   6
 451#define VNC_MSG_CLIENT_VMWARE_0                   127
 452#define VNC_MSG_CLIENT_CALL_CONTROL               249
 453#define VNC_MSG_CLIENT_XVP                        250
 454#define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 455#define VNC_MSG_CLIENT_TIGHT                      252
 456#define VNC_MSG_CLIENT_GII                        253
 457#define VNC_MSG_CLIENT_VMWARE_1                   254
 458#define VNC_MSG_CLIENT_QEMU                       255
 459
 460/* Server -> Client message IDs */
 461#define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 462#define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 463#define VNC_MSG_SERVER_BELL                       2
 464#define VNC_MSG_SERVER_CUT_TEXT                   3
 465#define VNC_MSG_SERVER_VMWARE_0                   127
 466#define VNC_MSG_SERVER_CALL_CONTROL               249
 467#define VNC_MSG_SERVER_XVP                        250
 468#define VNC_MSG_SERVER_TIGHT                      252
 469#define VNC_MSG_SERVER_GII                        253
 470#define VNC_MSG_SERVER_VMWARE_1                   254
 471#define VNC_MSG_SERVER_QEMU                       255
 472
 473
 474
 475/* QEMU client -> server message IDs */
 476#define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 477#define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 478
 479/* QEMU server -> client message IDs */
 480#define VNC_MSG_SERVER_QEMU_AUDIO                 1
 481
 482
 483
 484/* QEMU client -> server audio message IDs */
 485#define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 486#define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 487#define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 488
 489/* QEMU server -> client audio message IDs */
 490#define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 491#define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 492#define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 493
 494
 495/*****************************************************************************
 496 *
 497 * Internal APIs
 498 *
 499 *****************************************************************************/
 500
 501/* Event loop functions */
 502gboolean vnc_client_io(QIOChannel *ioc,
 503                       GIOCondition condition,
 504                       void *opaque);
 505
 506ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 507ssize_t 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_start_protocol(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);
 526ssize_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp);
 527
 528void start_client_init(VncState *vs);
 529void start_auth_vnc(VncState *vs);
 530
 531
 532/* Misc helpers */
 533
 534static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 535    return (vs->features & (1 << feature));
 536}
 537
 538/* Framebuffer */
 539void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 540                            int32_t encoding);
 541
 542/* server fb is in PIXMAN_x8r8g8b8 */
 543#define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 544#define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 545#define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 546
 547void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 548int vnc_server_fb_stride(VncDisplay *vd);
 549
 550void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 551double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 552void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 553
 554/* Encodings */
 555int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 556
 557int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 558
 559int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 560                                         int y, int w, int h);
 561void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 562
 563void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 564void vnc_zlib_zfree(void *x, void *addr);
 565int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 566void vnc_zlib_clear(VncState *vs);
 567
 568int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 569int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 570                                          int w, int h);
 571void vnc_tight_clear(VncState *vs);
 572
 573int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 574int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 575void vnc_zrle_clear(VncState *vs);
 576
 577#endif /* QEMU_VNC_H */
 578