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 "io/net-listener.h"
  41 #include <zlib.h>
  42
  43 #include "keymaps.h"
  44 #include "vnc-palette.h"
  45 #include "vnc-enc-zrle.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
  61 typedef struct VncState VncState;
  62 typedef struct VncJob VncJob;
  63 typedef struct VncRect VncRect;
  64 typedef struct VncRectEntry VncRectEntry;
  65
  66 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
  67
  68 typedef void VncWritePixels(VncState *vs, void *data, int size);
  69
  70 typedef 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
  98 typedef 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
 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],
 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
 128 typedef 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
 135 typedef enum VncSharePolicy {
 136     VNC_SHARE_POLICY_IGNORE = 1,
 137     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
 138     VNC_SHARE_POLICY_FORCE_SHARED,
 139 } VncSharePolicy;
 140
 141 struct 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     QIONetListener *listener;
 150     QIONetListener *wslistener;
 151     DisplaySurface *ds;
 152     DisplayChangeListener dcl;
 153     kbd_layout_t *kbd_layout;
 154     int lock_key_sync;
 155     QEMUPutLEDEntry *led;
 156     int ledstate;
 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
 185 typedef 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
 204 typedef struct VncHextile {
 205     VncSendHextileTile *send_tile;
 206 } VncHextile;
 207
 208 typedef struct VncZlib {
 209     Buffer zlib;
 210     Buffer tmp;
 211     z_stream stream;
 212     int level;
 213 } VncZlib;
 214
 215 typedef 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
 225 typedef struct VncZywrle {
 226     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
 227 } VncZywrle;
 228
 229 struct VncRect
 230 {
 231     int x;
 232     int y;
 233     int w;
 234     int h;
 235 };
 236
 237 struct VncRectEntry
 238 {
 239     struct VncRect rect;
 240     QLIST_ENTRY(VncRectEntry) next;
 241 };
 242
 243 struct VncJob
 244 {
 245     VncState *vs;
 246
 247     QLIST_HEAD(, VncRectEntry) rectangles;
 248     QTAILQ_ENTRY(VncJob) next;
 249 };
 250
 251 typedef enum {
 252     VNC_STATE_UPDATE_NONE,
 253     VNC_STATE_UPDATE_INCREMENTAL,
 254     VNC_STATE_UPDATE_FORCE,
 255 } VncStateUpdate;
 256
 257 struct VncState
 258 {
 259     QIOChannelSocket *sioc; /* The underlying socket */
 260     QIOChannel *ioc; /* The channel currently used for I/O */
 261     guint ioc_tag;
 262     gboolean disconnecting;
 263
 264     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
 265     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
 266                            * vnc-jobs-async.c */
 267
 268     VncDisplay *vd;
 269     VncStateUpdate update; /* Most recent pending request from client */
 270     VncStateUpdate job_update; /* Currently processed by job thread */
 271     int has_dirty;
 272     uint32_t features;
 273     int absolute;
 274     int last_x;
 275     int last_y;
 276     uint32_t last_bmask;
 277     size_t client_width; /* limited to u16 by RFB proto */
 278     size_t client_height; /* limited to u16 by RFB proto */
 279     VncShareMode share_mode;
 280
 281     uint32_t vnc_encoding;
 282
 283     int major;
 284     int minor;
 285
 286     int auth;
 287     int subauth; /* Used by VeNCrypt */
 288     char challenge[VNC_AUTH_CHALLENGE_SIZE];
 289     QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
 290 #ifdef CONFIG_VNC_SASL
 291     VncStateSASL sasl;
 292 #endif
 293     bool encode_ws;
 294     bool websocket;
 295
 296     VncClientInfo *info;
 297
 298     /* Job thread bottom half has put data for a forced update
 299      * into the output buffer. This offset points to the end of
 300      * the update data in the output buffer. This lets us determine
 301      * when a force update is fully sent to the client, allowing
 302      * us to process further forced updates. */
 303     size_t force_update_offset;
 304     /* We allow multiple incremental updates or audio capture
 305      * samples to be queued in output buffer, provided the
 306      * buffer size doesn't exceed this threshold. The value
 307      * is calculating dynamically based on framebuffer size
 308      * and audio sample settings in vnc_update_throttle_offset() */
 309     size_t throttle_output_offset;
 310     Buffer output;
 311     Buffer input;
 312     /* current output mode information */
 313     VncWritePixels *write_pixels;
 314     PixelFormat client_pf;
 315     pixman_format_code_t client_format;
 316     bool client_be;
 317
 318     CaptureVoiceOut *audio_cap;
 319     struct audsettings as;
 320
 321     VncReadEvent *read_handler;
 322     size_t read_handler_expect;
 323     /* input */
 324     uint8_t modifiers_state[256];
 325
 326     bool abort;
 327     QemuMutex output_mutex;
 328     QEMUBH *bh;
 329     Buffer jobs_buffer;
 330
 331     /* Encoding specific, if you add something here, don't forget to
 332      *  update vnc_async_encoding_start()
 333      */
 334     VncTight tight;
 335     VncZlib zlib;
 336     VncHextile hextile;
 337     VncZrle zrle;
 338     VncZywrle zywrle;
 339
 340     Notifier mouse_mode_notifier;
 341
 342     QTAILQ_ENTRY(VncState) next;
 343 };
 344
 345
 346 /*****************************************************************************
 347  *
 348  * Authentication modes
 349  *
 350  *****************************************************************************/
 351
 352 enum {
 353     VNC_AUTH_INVALID = 0,
 354     VNC_AUTH_NONE = 1,
 355     VNC_AUTH_VNC = 2,
 356     VNC_AUTH_RA2 = 5,
 357     VNC_AUTH_RA2NE = 6,
 358     VNC_AUTH_TIGHT = 16,
 359     VNC_AUTH_ULTRA = 17,
 360     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
 361     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
 362     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
 363 };
 364
 365 enum {
 366     VNC_AUTH_VENCRYPT_PLAIN = 256,
 367     VNC_AUTH_VENCRYPT_TLSNONE = 257,
 368     VNC_AUTH_VENCRYPT_TLSVNC = 258,
 369     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
 370     VNC_AUTH_VENCRYPT_X509NONE = 260,
 371     VNC_AUTH_VENCRYPT_X509VNC = 261,
 372     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
 373     VNC_AUTH_VENCRYPT_X509SASL = 263,
 374     VNC_AUTH_VENCRYPT_TLSSASL = 264,
 375 };
 376
 377
 378 /*****************************************************************************
 379  *
 380  * Encoding types
 381  *
 382  *****************************************************************************/
 383
 384 #define VNC_ENCODING_RAW                  0x00000000
 385 #define VNC_ENCODING_COPYRECT             0x00000001
 386 #define VNC_ENCODING_RRE                  0x00000002
 387 #define VNC_ENCODING_CORRE                0x00000004
 388 #define VNC_ENCODING_HEXTILE              0x00000005
 389 #define VNC_ENCODING_ZLIB                 0x00000006
 390 #define VNC_ENCODING_TIGHT                0x00000007
 391 #define VNC_ENCODING_ZLIBHEX              0x00000008
 392 #define VNC_ENCODING_TRLE                 0x0000000f
 393 #define VNC_ENCODING_ZRLE                 0x00000010
 394 #define VNC_ENCODING_ZYWRLE               0x00000011
 395 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
 396 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
 397 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
 398 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
 399 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
 400 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
 401 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
 402 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
 403 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
 404 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
 405 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
 406 #define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
 407 #define VNC_ENCODING_WMVi                 0x574D5669
 408
 409 /*****************************************************************************
 410  *
 411  * Other tight constants
 412  *
 413  *****************************************************************************/
 414
 415 /*
 416  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
 417  */
 418
 419 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
 420 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
 421 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
 422 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
 423 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
 424 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
 425 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
 426 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
 427
 428 /*****************************************************************************
 429  *
 430  * Features
 431  *
 432  *****************************************************************************/
 433
 434 #define VNC_FEATURE_RESIZE                   0
 435 #define VNC_FEATURE_HEXTILE                  1
 436 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
 437 #define VNC_FEATURE_WMVI                     3
 438 #define VNC_FEATURE_TIGHT                    4
 439 #define VNC_FEATURE_ZLIB                     5
 440 #define VNC_FEATURE_COPYRECT                 6
 441 #define VNC_FEATURE_RICH_CURSOR              7
 442 #define VNC_FEATURE_TIGHT_PNG                8
 443 #define VNC_FEATURE_ZRLE                     9
 444 #define VNC_FEATURE_ZYWRLE                  10
 445 #define VNC_FEATURE_LED_STATE               11
 446
 447 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
 448 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
 449 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
 450 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
 451 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
 452 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
 453 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
 454 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
 455 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
 456 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
 457 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
 458 #define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
 459
 460
 461 /* Client -> Server message IDs */
 462 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
 463 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
 464 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
 465 #define VNC_MSG_CLIENT_KEY_EVENT                  4
 466 #define VNC_MSG_CLIENT_POINTER_EVENT              5
 467 #define VNC_MSG_CLIENT_CUT_TEXT                   6
 468 #define VNC_MSG_CLIENT_VMWARE_0                   127
 469 #define VNC_MSG_CLIENT_CALL_CONTROL               249
 470 #define VNC_MSG_CLIENT_XVP                        250
 471 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
 472 #define VNC_MSG_CLIENT_TIGHT                      252
 473 #define VNC_MSG_CLIENT_GII                        253
 474 #define VNC_MSG_CLIENT_VMWARE_1                   254
 475 #define VNC_MSG_CLIENT_QEMU                       255
 476
 477 /* Server -> Client message IDs */
 478 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
 479 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
 480 #define VNC_MSG_SERVER_BELL                       2
 481 #define VNC_MSG_SERVER_CUT_TEXT                   3
 482 #define VNC_MSG_SERVER_VMWARE_0                   127
 483 #define VNC_MSG_SERVER_CALL_CONTROL               249
 484 #define VNC_MSG_SERVER_XVP                        250
 485 #define VNC_MSG_SERVER_TIGHT                      252
 486 #define VNC_MSG_SERVER_GII                        253
 487 #define VNC_MSG_SERVER_VMWARE_1                   254
 488 #define VNC_MSG_SERVER_QEMU                       255
 489
 490
 491
 492 /* QEMU client -> server message IDs */
 493 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
 494 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
 495
 496 /* QEMU server -> client message IDs */
 497 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
 498
 499
 500
 501 /* QEMU client -> server audio message IDs */
 502 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
 503 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
 504 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
 505
 506 /* QEMU server -> client audio message IDs */
 507 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
 508 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
 509 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
 510
 511
 512 /*****************************************************************************
 513  *
 514  * Internal APIs
 515  *
 516  *****************************************************************************/
 517
 518 /* Event loop functions */
 519 gboolean vnc_client_io(QIOChannel *ioc,
 520                        GIOCondition condition,
 521                        void *opaque);
 522
 523 size_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
 524 size_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
 525
 526 /* Protocol I/O functions */
 527 void vnc_write(VncState *vs, const void *data, size_t len);
 528 void vnc_write_u32(VncState *vs, uint32_t value);
 529 void vnc_write_s32(VncState *vs, int32_t value);
 530 void vnc_write_u16(VncState *vs, uint16_t value);
 531 void vnc_write_u8(VncState *vs, uint8_t value);
 532 void vnc_flush(VncState *vs);
 533 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
 534 void vnc_disconnect_finish(VncState *vs);
 535 void vnc_start_protocol(VncState *vs);
 536
 537
 538 /* Buffer I/O functions */
 539 uint32_t read_u32(uint8_t *data, size_t offset);
 540
 541 /* Protocol stage functions */
 542 void vnc_client_error(VncState *vs);
 543 size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp);
 544
 545 void start_client_init(VncState *vs);
 546 void start_auth_vnc(VncState *vs);
 547
 548
 549 /* Misc helpers */
 550
 551 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
 552     return (vs->features & (1 << feature));
 553 }
 554
 555 /* Framebuffer */
 556 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
 557                             int32_t encoding);
 558
 559 /* server fb is in PIXMAN_x8r8g8b8 */
 560 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
 561 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
 562 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
 563
 564 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
 565 int vnc_server_fb_stride(VncDisplay *vd);
 566
 567 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
 568 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
 569 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
 570
 571 /* Encodings */
 572 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 573
 574 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 575
 576 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
 577                                          int y, int w, int h);
 578 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
 579
 580 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
 581 void vnc_zlib_zfree(void *x, void *addr);
 582 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 583 void vnc_zlib_clear(VncState *vs);
 584
 585 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 586 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
 587                                           int w, int h);
 588 void vnc_tight_clear(VncState *vs);
 589
 590 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 591 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
 592 void vnc_zrle_clear(VncState *vs);
 593
 594 #endif /* QEMU_VNC_H */