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 "qapi/qapi-types-ui.h"
  32 #include "qemu/queue.h"
  33 #include "qemu/thread.h"
  34 #include "ui/console.h"
  35 #include "audio/audio.h"
  36 #include "qemu/bitmap.h"
  37 #include "crypto/tlssession.h"
  38 #include "qemu/buffer.h"
  39 #include "io/channel-socket.h"
  40 #include "io/channel-tls.h"
  41 #include "io/net-listener.h"
  42 #include <zlib.h>
  43
  44 #include "keymaps.h"
  45 #include "vnc-palette.h"
  46 #include "vnc-enc-zrle.h"
  47
  48 // #define _VNC_DEBUG 1
  49
  50 #ifdef _VNC_DEBUG
  51 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  52 #else
  53 #define VNC_DEBUG(fmt, ...) do { } while (0)
  54 #endif
  55
  56 /*****************************************************************************
  57  *
  58  * Core data structures
  59  *
  60  *****************************************************************************/
  61
  62 typedef struct VncState VncState;
  63 typedef struct VncJob VncJob;
  64 typedef struct VncRect VncRect;
  65 typedef struct VncRectEntry VncRectEntry;
  66
  67 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  68
  69 typedef void VncWritePixels(VncState *vs, void *data, int size);
  70
  71 typedef void VncSendHextileTile(VncState *vs,
  72                                 int x, int y, int w, int h,
  73                                 void *last_bg,
  74                                 void *last_fg,
  75                                 int *has_bg, int *has_fg);
  76
  77 /* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
  78  * by one bit in the dirty bitmap, should be a power of 2 */
  79 #define VNC_DIRTY_PIXELS_PER_BIT 16
  80
  81 /* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
  82
  83 #define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
  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 / VNC_DIRTY_PIXELS_PER_BIT)
  88
  89 /* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
  90  * VNC_DIRTY_BITS due to alignment */
  91 #define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
  92
  93 #define VNC_STAT_RECT  64
  94 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
  95 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
  96
  97 #define VNC_AUTH_CHALLENGE_SIZE 16
  98
  99 typedef struct VncDisplay VncDisplay;
 100
 101 #include "vnc-auth-vencrypt.h"
 102 #ifdef CONFIG_VNC_SASL
 103 #include "vnc-auth-sasl.h"
 104 #endif
 105 #include "vnc-ws.h"
 106
 107 struct VncRectStat
 108 {
 109     /* time of last 10 updates, to find update frequency */
 110     struct timeval times[10];
 111     int idx;
 112
 113     double freq;        /* Update frequency (in Hz) */
 114     bool updated;       /* Already updated during this refresh */
 115 };
 116
 117 typedef struct VncRectStat VncRectStat;
 118
 119 struct VncSurface
 120 {
 121     struct timeval last_freq_check;
 122     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT],
 123                    VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT);
 124     VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
 125     pixman_image_t *fb;
 126     pixman_format_code_t format;
 127 };
 128
 129 typedef enum VncShareMode {
 130     VNC_SHARE_MODE_CONNECTING = 1,
 131     VNC_SHARE_MODE_SHARED,
 132     VNC_SHARE_MODE_EXCLUSIVE,
 133     VNC_SHARE_MODE_DISCONNECTED,
 134 } VncShareMode;
 135
 136 typedef enum VncSharePolicy {
 137     VNC_SHARE_POLICY_IGNORE = 1,
 138     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 139     VNC_SHARE_POLICY_FORCE_SHARED,
 140 } VncSharePolicy;
 141
 142 struct VncDisplay
 143 {
 144     QTAILQ_HEAD(, VncState) clients;
 145     int num_connecting;
 146     int num_shared;
 147     int num_exclusive;
 148     int connections_limit;
 149     VncSharePolicy share_policy;
 150     QIONetListener *listener;
 151     QIONetListener *wslistener;
 152     DisplaySurface *ds;
 153     DisplayChangeListener dcl;
 154     kbd_layout_t *kbd_layout;
 155     int lock_key_sync;
 156     QEMUPutLEDEntry *led;
 157     int ledstate;
 158     int key_delay_ms;
 159     QemuMutex mutex;
 160
 161     QEMUCursor *cursor;
 162     int cursor_msize;
 163     uint8_t *cursor_mask;
 164
 165     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
 166     pixman_image_t *server;    /* vnc server surface */
 167
 168     const char *id;
 169     QTAILQ_ENTRY(VncDisplay) next;
 170     bool is_unix;
 171     char *password;
 172     time_t expires;
 173     int auth;
 174     int subauth; /* Used by VeNCrypt */
 175     int ws_auth; /* Used by websockets */
 176     int ws_subauth; /* Used by websockets */
 177     bool lossy;
 178     bool non_adaptive;
 179     QCryptoTLSCreds *tlscreds;
 180     char *tlsaclname;
 181 #ifdef CONFIG_VNC_SASL
 182     VncDisplaySASL sasl;
 183 #endif
 184 };
 185
 186 typedef struct VncTight {
 187     int type;
 188     uint8_t quality;
 189     uint8_t compression;
 190     uint8_t pixel24;
 191     Buffer tight;
 192     Buffer tmp;
 193     Buffer zlib;
 194     Buffer gradient;
 195 #ifdef CONFIG_VNC_JPEG
 196     Buffer jpeg;
 197 #endif
 198 #ifdef CONFIG_VNC_PNG
 199     Buffer png;
 200 #endif
 201     int levels[4];
 202     z_stream stream[4];
 203 } VncTight;
 204
 205 typedef struct VncHextile {
 206     VncSendHextileTile *send_tile;
 207 } VncHextile;
 208
 209 typedef struct VncZlib {
 210     Buffer zlib;
 211     Buffer tmp;
 212     z_stream stream;
 213     int level;
 214 } VncZlib;
 215
 216 typedef struct VncZrle {
 217     int type;
 218     Buffer fb;
 219     Buffer zrle;
 220     Buffer tmp;
 221     Buffer zlib;
 222     z_stream stream;
 223     VncPalette palette;
 224 } VncZrle;
 225
 226 typedef struct VncZywrle {
 227     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 228 } VncZywrle;
 229
 230 struct VncRect
 231 {
 232     int x;
 233     int y;
 234     int w;
 235     int h;
 236 };
 237
 238 struct VncRectEntry
 239 {
 240     struct VncRect rect;
 241     QLIST_ENTRY(VncRectEntry) next;
 242 };
 243
 244 struct VncJob
 245 {
 246     VncState *vs;
 247
 248     QLIST_HEAD(, VncRectEntry) rectangles;
 249     QTAILQ_ENTRY(VncJob) next;
 250 };
 251
 252 typedef enum {
 253     VNC_STATE_UPDATE_NONE,
 254     VNC_STATE_UPDATE_INCREMENTAL,
 255     VNC_STATE_UPDATE_FORCE,
 256 } VncStateUpdate;
 257
 258 struct VncState
 259 {
 260     QIOChannelSocket *sioc; /* The underlying socket */
 261     QIOChannel *ioc; /* The channel currently used for I/O */
 262     guint ioc_tag;
 263     gboolean disconnecting;
 264
 265     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 266     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 267                            * vnc-jobs-async.c */
 268
 269     VncDisplay *vd;
 270     VncStateUpdate update; /* Most recent pending request from client */
 271     VncStateUpdate job_update; /* Currently processed by job thread */
 272     int has_dirty;
 273     uint32_t features;
 274     int absolute;
 275     int last_x;
 276     int last_y;
 277     uint32_t last_bmask;
 278     size_t client_width; /* limited to u16 by RFB proto */
 279     size_t client_height; /* limited to u16 by RFB proto */
 280     VncShareMode share_mode;
 281
 282     uint32_t vnc_encoding;
 283
 284     int major;
 285     int minor;
 286
 287     int auth;
 288     int subauth; /* Used by VeNCrypt */
 289     char challenge[VNC_AUTH_CHALLENGE_SIZE];
 290     QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
 291 #ifdef CONFIG_VNC_SASL
 292     VncStateSASL sasl;
 293 #endif
 294     bool encode_ws;
 295     bool websocket;
 296
 297     VncClientInfo *info;
 298
 299     /* Job thread bottom half has put data for a forced update
 300      * into the output buffer. This offset points to the end of
 301      * the update data in the output buffer. This lets us determine
 302      * when a force update is fully sent to the client, allowing
 303      * us to process further forced updates. */
 304     size_t force_update_offset;
 305     /* We allow multiple incremental updates or audio capture
 306      * samples to be queued in output buffer, provided the
 307      * buffer size doesn't exceed this threshold. The value
 308      * is calculating dynamically based on framebuffer size
 309      * and audio sample settings in vnc_update_throttle_offset() */
 310     size_t throttle_output_offset;
 311     Buffer output;
 312     Buffer input;
 313     /* current output mode information */
 314     VncWritePixels *write_pixels;
 315     PixelFormat client_pf;
 316     pixman_format_code_t client_format;
 317     bool client_be;
 318
 319     CaptureVoiceOut *audio_cap;
 320     struct audsettings as;
 321
 322     VncReadEvent *read_handler;
 323     size_t read_handler_expect;
 324     /* input */
 325     uint8_t modifiers_state[256];
 326
 327     bool abort;
 328     QemuMutex output_mutex;
 329     QEMUBH *bh;
 330     Buffer jobs_buffer;
 331
 332     /* Encoding specific, if you add something here, don't forget to
 333      *  update vnc_async_encoding_start()
 334      */
 335     VncTight tight;
 336     VncZlib zlib;
 337     VncHextile hextile;
 338     VncZrle zrle;
 339     VncZywrle zywrle;
 340
 341     Notifier mouse_mode_notifier;
 342
 343     QTAILQ_ENTRY(VncState) next;
 344 };
 345
 346
 347 /*****************************************************************************
 348  *
 349  * Authentication modes
 350  *
 351  *****************************************************************************/
 352
 353 enum {
 354     VNC_AUTH_INVALID = 0,
 355     VNC_AUTH_NONE = 1,
 356     VNC_AUTH_VNC = 2,
 357     VNC_AUTH_RA2 = 5,
 358     VNC_AUTH_RA2NE = 6,
 359     VNC_AUTH_TIGHT = 16,
 360     VNC_AUTH_ULTRA = 17,
 361     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 362     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 363     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 364 };
 365
 366 enum {
 367     VNC_AUTH_VENCRYPT_PLAIN = 256,
 368     VNC_AUTH_VENCRYPT_TLSNONE = 257,
 369     VNC_AUTH_VENCRYPT_TLSVNC = 258,
 370     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 371     VNC_AUTH_VENCRYPT_X509NONE = 260,
 372     VNC_AUTH_VENCRYPT_X509VNC = 261,
 373     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 374     VNC_AUTH_VENCRYPT_X509SASL = 263,
 375     VNC_AUTH_VENCRYPT_TLSSASL = 264,
 376 };
 377
 378
 379 /*****************************************************************************
 380  *
 381  * Encoding types
 382  *
 383  *****************************************************************************/
 384
 385 #define VNC_ENCODING_RAW                  0x00000000
 386 #define VNC_ENCODING_COPYRECT             0x00000001
 387 #define VNC_ENCODING_RRE                  0x00000002
 388 #define VNC_ENCODING_CORRE                0x00000004
 389 #define VNC_ENCODING_HEXTILE              0x00000005
 390 #define VNC_ENCODING_ZLIB                 0x00000006
 391 #define VNC_ENCODING_TIGHT                0x00000007
 392 #define VNC_ENCODING_ZLIBHEX              0x00000008
 393 #define VNC_ENCODING_TRLE                 0x0000000f
 394 #define VNC_ENCODING_ZRLE                 0x00000010
 395 #define VNC_ENCODING_ZYWRLE               0x00000011
 396 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 397 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 398 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 399 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 400 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 401 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 402 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 403 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 404 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 405 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 406 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 407 #define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
 408 #define VNC_ENCODING_WMVi                 0x574D5669
 409
 410 /*****************************************************************************
 411  *
 412  * Other tight constants
 413  *
 414  *****************************************************************************/
 415
 416 /*
 417  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 418  */
 419
 420 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 421 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 422 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 423 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 424 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 425 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 426 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 427 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 428
 429 /*****************************************************************************
 430  *
 431  * Features
 432  *
 433  *****************************************************************************/
 434
 435 #define VNC_FEATURE_RESIZE                   0
 436 #define VNC_FEATURE_HEXTILE                  1
 437 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 438 #define VNC_FEATURE_WMVI                     3
 439 #define VNC_FEATURE_TIGHT                    4
 440 #define VNC_FEATURE_ZLIB                     5
 441 #define VNC_FEATURE_COPYRECT                 6
 442 #define VNC_FEATURE_RICH_CURSOR              7
 443 #define VNC_FEATURE_TIGHT_PNG                8
 444 #define VNC_FEATURE_ZRLE                     9
 445 #define VNC_FEATURE_ZYWRLE                  10
 446 #define VNC_FEATURE_LED_STATE               11
 447
 448 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 449 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 450 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 451 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 452 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 453 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 454 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 455 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 456 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 457 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 458 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 459 #define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
 460
 461
 462 /* Client -> Server message IDs */
 463 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 464 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
 465 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 466 #define VNC_MSG_CLIENT_KEY_EVENT                  4
 467 #define VNC_MSG_CLIENT_POINTER_EVENT              5
 468 #define VNC_MSG_CLIENT_CUT_TEXT                   6
 469 #define VNC_MSG_CLIENT_VMWARE_0                   127
 470 #define VNC_MSG_CLIENT_CALL_CONTROL               249
 471 #define VNC_MSG_CLIENT_XVP                        250
 472 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 473 #define VNC_MSG_CLIENT_TIGHT                      252
 474 #define VNC_MSG_CLIENT_GII                        253
 475 #define VNC_MSG_CLIENT_VMWARE_1                   254
 476 #define VNC_MSG_CLIENT_QEMU                       255
 477
 478 /* Server -> Client message IDs */
 479 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 480 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 481 #define VNC_MSG_SERVER_BELL                       2
 482 #define VNC_MSG_SERVER_CUT_TEXT                   3
 483 #define VNC_MSG_SERVER_VMWARE_0                   127
 484 #define VNC_MSG_SERVER_CALL_CONTROL               249
 485 #define VNC_MSG_SERVER_XVP                        250
 486 #define VNC_MSG_SERVER_TIGHT                      252
 487 #define VNC_MSG_SERVER_GII                        253
 488 #define VNC_MSG_SERVER_VMWARE_1                   254
 489 #define VNC_MSG_SERVER_QEMU                       255
 490
 491
 492
 493 /* QEMU client -> server message IDs */
 494 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 495 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 496
 497 /* QEMU server -> client message IDs */
 498 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
 499
 500
 501
 502 /* QEMU client -> server audio message IDs */
 503 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 504 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 505 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 506
 507 /* QEMU server -> client audio message IDs */
 508 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 509 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 510 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 511
 512
 513 /*****************************************************************************
 514  *
 515  * Internal APIs
 516  *
 517  *****************************************************************************/
 518
 519 /* Event loop functions */
 520 gboolean vnc_client_io(QIOChannel *ioc,
 521                        GIOCondition condition,
 522                        void *opaque);
 523
 524 size_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 525 size_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 526
 527 /* Protocol I/O functions */
 528 void vnc_write(VncState *vs, const void *data, size_t len);
 529 void vnc_write_u32(VncState *vs, uint32_t value);
 530 void vnc_write_s32(VncState *vs, int32_t value);
 531 void vnc_write_u16(VncState *vs, uint16_t value);
 532 void vnc_write_u8(VncState *vs, uint8_t value);
 533 void vnc_flush(VncState *vs);
 534 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 535 void vnc_disconnect_finish(VncState *vs);
 536 void vnc_start_protocol(VncState *vs);
 537
 538
 539 /* Buffer I/O functions */
 540 uint32_t read_u32(uint8_t *data, size_t offset);
 541
 542 /* Protocol stage functions */
 543 void vnc_client_error(VncState *vs);
 544 size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp);
 545
 546 void start_client_init(VncState *vs);
 547 void start_auth_vnc(VncState *vs);
 548
 549
 550 /* Misc helpers */
 551
 552 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 553     return (vs->features & (1 << feature));
 554 }
 555
 556 /* Framebuffer */
 557 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 558                             int32_t encoding);
 559
 560 /* server fb is in PIXMAN_x8r8g8b8 */
 561 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 562 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 563 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 564
 565 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 566 int vnc_server_fb_stride(VncDisplay *vd);
 567
 568 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 569 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 570 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 571
 572 /* Encodings */
 573 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 574
 575 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 576
 577 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 578                                          int y, int w, int h);
 579 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 580
 581 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 582 void vnc_zlib_zfree(void *x, void *addr);
 583 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 584 void vnc_zlib_clear(VncState *vs);
 585
 586 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 587 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 588                                           int w, int h);
 589 void vnc_tight_clear(VncState *vs);
 590
 591 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 592 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 593 void vnc_zrle_clear(VncState *vs);
 594
 595 #endif /* QEMU_VNC_H */