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
  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 #ifdef CONFIG_VNC_WS
 103 #include "vnc-ws.h"
 104 #endif
 105
 106 struct 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
 116 typedef struct VncRectStat VncRectStat;
 117
 118 struct 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
 127 typedef 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
 134 typedef enum VncSharePolicy {
 135     VNC_SHARE_POLICY_IGNORE = 1,
 136     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 137     VNC_SHARE_POLICY_FORCE_SHARED,
 138 } VncSharePolicy;
 139
 140 struct VncDisplay
 141 {
 142     QTAILQ_HEAD(, VncState) clients;
 143     int num_exclusive;
 144     VncSharePolicy share_policy;
 145     QEMUTimer *timer;
 146     int timer_interval;
 147     int lsock;
 148 #ifdef CONFIG_VNC_WS
 149     int lwebsock;
 150     bool websocket;
 151     char *ws_display;
 152 #endif
 153     DisplayState *ds;
 154     DisplayChangeListener dcl;
 155     kbd_layout_t *kbd_layout;
 156     int lock_key_sync;
 157     QemuMutex mutex;
 158
 159     QEMUCursor *cursor;
 160     int cursor_msize;
 161     uint8_t *cursor_mask;
 162
 163     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 164     pixman_image_t *server;    /* vnc server surface */
 165
 166     char *display;
 167     char *password;
 168     time_t expires;
 169     int auth;
 170     bool lossy;
 171     bool non_adaptive;
 172 #ifdef CONFIG_VNC_TLS
 173     int subauth; /* Used by VeNCrypt */
 174     VncDisplayTLS tls;
 175 #endif
 176 #ifdef CONFIG_VNC_SASL
 177     VncDisplaySASL sasl;
 178 #endif
 179 };
 180
 181 typedef struct VncTight {
 182     int type;
 183     uint8_t quality;
 184     uint8_t compression;
 185     uint8_t pixel24;
 186     Buffer tight;
 187     Buffer tmp;
 188     Buffer zlib;
 189     Buffer gradient;
 190 #ifdef CONFIG_VNC_JPEG
 191     Buffer jpeg;
 192 #endif
 193 #ifdef CONFIG_VNC_PNG
 194     Buffer png;
 195 #endif
 196     int levels[4];
 197     z_stream stream[4];
 198 } VncTight;
 199
 200 typedef struct VncHextile {
 201     VncSendHextileTile *send_tile;
 202 } VncHextile;
 203
 204 typedef struct VncZlib {
 205     Buffer zlib;
 206     Buffer tmp;
 207     z_stream stream;
 208     int level;
 209 } VncZlib;
 210
 211 typedef struct VncZrle {
 212     int type;
 213     Buffer fb;
 214     Buffer zrle;
 215     Buffer tmp;
 216     Buffer zlib;
 217     z_stream stream;
 218     VncPalette palette;
 219 } VncZrle;
 220
 221 typedef struct VncZywrle {
 222     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 223 } VncZywrle;
 224
 225 struct VncRect
 226 {
 227     int x;
 228     int y;
 229     int w;
 230     int h;
 231 };
 232
 233 struct VncRectEntry
 234 {
 235     struct VncRect rect;
 236     QLIST_ENTRY(VncRectEntry) next;
 237 };
 238
 239 struct VncJob
 240 {
 241     VncState *vs;
 242
 243     QLIST_HEAD(, VncRectEntry) rectangles;
 244     QTAILQ_ENTRY(VncJob) next;
 245 };
 246
 247 struct VncState
 248 {
 249     int csock;
 250
 251     DisplayState *ds;
 252     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 253     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 254                            * vnc-jobs-async.c */
 255
 256     VncDisplay *vd;
 257     int need_update;
 258     int force_update;
 259     uint32_t features;
 260     int absolute;
 261     int last_x;
 262     int last_y;
 263     int client_width;
 264     int client_height;
 265     VncShareMode share_mode;
 266
 267     uint32_t vnc_encoding;
 268
 269     int major;
 270     int minor;
 271
 272     int auth;
 273     char challenge[VNC_AUTH_CHALLENGE_SIZE];
 274 #ifdef CONFIG_VNC_TLS
 275     int subauth; /* Used by VeNCrypt */
 276     VncStateTLS tls;
 277 #endif
 278 #ifdef CONFIG_VNC_SASL
 279     VncStateSASL sasl;
 280 #endif
 281 #ifdef CONFIG_VNC_WS
 282     bool encode_ws;
 283     bool websocket;
 284 #endif
 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
 336 enum {
 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
 349 enum {
 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_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
 429 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 430 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 431 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 432 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 433 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 434 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 435 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 436 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 437 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 438 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 439 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 440
 441
 442 /* Client -> Server message IDs */
 443 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 444 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
 445 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 446 #define VNC_MSG_CLIENT_KEY_EVENT                  4
 447 #define VNC_MSG_CLIENT_POINTER_EVENT              5
 448 #define VNC_MSG_CLIENT_CUT_TEXT                   6
 449 #define VNC_MSG_CLIENT_VMWARE_0                   127
 450 #define VNC_MSG_CLIENT_CALL_CONTROL               249
 451 #define VNC_MSG_CLIENT_XVP                        250
 452 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 453 #define VNC_MSG_CLIENT_TIGHT                      252
 454 #define VNC_MSG_CLIENT_GII                        253
 455 #define VNC_MSG_CLIENT_VMWARE_1                   254
 456 #define VNC_MSG_CLIENT_QEMU                       255
 457
 458 /* Server -> Client message IDs */
 459 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 460 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 461 #define VNC_MSG_SERVER_BELL                       2
 462 #define VNC_MSG_SERVER_CUT_TEXT                   3
 463 #define VNC_MSG_SERVER_VMWARE_0                   127
 464 #define VNC_MSG_SERVER_CALL_CONTROL               249
 465 #define VNC_MSG_SERVER_XVP                        250
 466 #define VNC_MSG_SERVER_TIGHT                      252
 467 #define VNC_MSG_SERVER_GII                        253
 468 #define VNC_MSG_SERVER_VMWARE_1                   254
 469 #define VNC_MSG_SERVER_QEMU                       255
 470
 471
 472
 473 /* QEMU client -> server message IDs */
 474 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 475 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 476
 477 /* QEMU server -> client message IDs */
 478 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
 479
 480
 481
 482 /* QEMU client -> server audio message IDs */
 483 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 484 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 485 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 486
 487 /* QEMU server -> client audio message IDs */
 488 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 489 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 490 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 491
 492
 493 /*****************************************************************************
 494  *
 495  * Internal APIs
 496  *
 497  *****************************************************************************/
 498
 499 /* Event loop functions */
 500 void vnc_client_read(void *opaque);
 501 void vnc_client_write(void *opaque);
 502
 503 long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 504 long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 505
 506 /* Protocol I/O functions */
 507 void vnc_write(VncState *vs, const void *data, size_t len);
 508 void vnc_write_u32(VncState *vs, uint32_t value);
 509 void vnc_write_s32(VncState *vs, int32_t value);
 510 void vnc_write_u16(VncState *vs, uint16_t value);
 511 void vnc_write_u8(VncState *vs, uint8_t value);
 512 void vnc_flush(VncState *vs);
 513 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 514 void vnc_disconnect_finish(VncState *vs);
 515 void vnc_init_state(VncState *vs);
 516
 517
 518 /* Buffer I/O functions */
 519 uint32_t read_u32(uint8_t *data, size_t offset);
 520
 521 /* Protocol stage functions */
 522 void vnc_client_error(VncState *vs);
 523 int vnc_client_io_error(VncState *vs, int ret, int last_errno);
 524
 525 void start_client_init(VncState *vs);
 526 void start_auth_vnc(VncState *vs);
 527
 528 /* Buffer management */
 529 void buffer_reserve(Buffer *buffer, size_t len);
 530 void buffer_reset(Buffer *buffer);
 531 void buffer_free(Buffer *buffer);
 532 void buffer_append(Buffer *buffer, const void *data, size_t len);
 533 void buffer_advance(Buffer *buf, size_t len);
 534 uint8_t *buffer_end(Buffer *buffer);
 535
 536
 537 /* Misc helpers */
 538
 539 char *vnc_socket_local_addr(const char *format, int fd);
 540 char *vnc_socket_remote_addr(const char *format, int fd);
 541
 542 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 543     return (vs->features & (1 << feature));
 544 }
 545
 546 /* Framebuffer */
 547 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 548                             int32_t encoding);
 549
 550 /* server fb is in PIXMAN_x8r8g8b8 */
 551 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 552 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 553 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 554
 555 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 556 int vnc_server_fb_stride(VncDisplay *vd);
 557
 558 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 559 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 560 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 561
 562 /* Encodings */
 563 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 564
 565 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 566
 567 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 568                                          int y, int w, int h);
 569 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 570
 571 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 572 void vnc_zlib_zfree(void *x, void *addr);
 573 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 574 void vnc_zlib_clear(VncState *vs);
 575
 576 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 577 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 578                                           int w, int h);
 579 void vnc_tight_clear(VncState *vs);
 580
 581 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 582 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 583 void vnc_zrle_clear(VncState *vs);
 584
 585 #endif /* __QEMU_VNC_H */