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 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 QIOChannelSocket *lsock; 150 guint lsock_tag; 151 QIOChannelSocket *lwebsock; 152 guint lwebsock_tag; 153 bool ws_enabled; 154 DisplaySurface *ds; 155 DisplayChangeListener dcl; 156 kbd_layout_t *kbd_layout; 157 int lock_key_sync; 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 enabled; 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 bool ws_tls; /* 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 struct VncState 253 { 254 QIOChannelSocket *sioc; /* The underlying socket */ 255 QIOChannel *ioc; /* The channel currently used for I/O */ 256 guint ioc_tag; 257 gboolean disconnecting; 258 259 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS); 260 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in 261 * vnc-jobs-async.c */ 262 263 VncDisplay *vd; 264 int need_update; 265 int force_update; 266 int has_dirty; 267 uint32_t features; 268 int absolute; 269 int last_x; 270 int last_y; 271 uint32_t last_bmask; 272 int client_width; 273 int client_height; 274 VncShareMode share_mode; 275 276 uint32_t vnc_encoding; 277 278 int major; 279 int minor; 280 281 int auth; 282 int subauth; /* Used by VeNCrypt */ 283 char challenge[VNC_AUTH_CHALLENGE_SIZE]; 284 QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */ 285 #ifdef CONFIG_VNC_SASL 286 VncStateSASL sasl; 287 #endif 288 bool encode_ws; 289 bool websocket; 290 291 VncClientInfo *info; 292 293 Buffer output; 294 Buffer input; 295 /* current output mode information */ 296 VncWritePixels *write_pixels; 297 PixelFormat client_pf; 298 pixman_format_code_t client_format; 299 bool client_be; 300 301 CaptureVoiceOut *audio_cap; 302 struct audsettings as; 303 304 VncReadEvent *read_handler; 305 size_t read_handler_expect; 306 /* input */ 307 uint8_t modifiers_state[256]; 308 QEMUPutLEDEntry *led; 309 310 bool abort; 311 bool initialized; 312 QemuMutex output_mutex; 313 QEMUBH *bh; 314 Buffer jobs_buffer; 315 316 /* Encoding specific, if you add something here, don't forget to 317 * update vnc_async_encoding_start() 318 */ 319 VncTight tight; 320 VncZlib zlib; 321 VncHextile hextile; 322 VncZrle zrle; 323 VncZywrle zywrle; 324 325 Notifier mouse_mode_notifier; 326 327 QTAILQ_ENTRY(VncState) next; 328 }; 329 330 331 /***************************************************************************** 332 * 333 * Authentication modes 334 * 335 *****************************************************************************/ 336 337 enum { 338 VNC_AUTH_INVALID = 0, 339 VNC_AUTH_NONE = 1, 340 VNC_AUTH_VNC = 2, 341 VNC_AUTH_RA2 = 5, 342 VNC_AUTH_RA2NE = 6, 343 VNC_AUTH_TIGHT = 16, 344 VNC_AUTH_ULTRA = 17, 345 VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */ 346 VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */ 347 VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */ 348 }; 349 350 enum { 351 VNC_AUTH_VENCRYPT_PLAIN = 256, 352 VNC_AUTH_VENCRYPT_TLSNONE = 257, 353 VNC_AUTH_VENCRYPT_TLSVNC = 258, 354 VNC_AUTH_VENCRYPT_TLSPLAIN = 259, 355 VNC_AUTH_VENCRYPT_X509NONE = 260, 356 VNC_AUTH_VENCRYPT_X509VNC = 261, 357 VNC_AUTH_VENCRYPT_X509PLAIN = 262, 358 VNC_AUTH_VENCRYPT_X509SASL = 263, 359 VNC_AUTH_VENCRYPT_TLSSASL = 264, 360 }; 361 362 363 /***************************************************************************** 364 * 365 * Encoding types 366 * 367 *****************************************************************************/ 368 369 #define VNC_ENCODING_RAW 0x00000000 370 #define VNC_ENCODING_COPYRECT 0x00000001 371 #define VNC_ENCODING_RRE 0x00000002 372 #define VNC_ENCODING_CORRE 0x00000004 373 #define VNC_ENCODING_HEXTILE 0x00000005 374 #define VNC_ENCODING_ZLIB 0x00000006 375 #define VNC_ENCODING_TIGHT 0x00000007 376 #define VNC_ENCODING_ZLIBHEX 0x00000008 377 #define VNC_ENCODING_TRLE 0x0000000f 378 #define VNC_ENCODING_ZRLE 0x00000010 379 #define VNC_ENCODING_ZYWRLE 0x00000011 380 #define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */ 381 #define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */ 382 #define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */ 383 #define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */ 384 #define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */ 385 #define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */ 386 #define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */ 387 #define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */ 388 #define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */ 389 #define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */ 390 #define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */ 391 #define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */ 392 #define VNC_ENCODING_WMVi 0x574D5669 393 394 /***************************************************************************** 395 * 396 * Other tight constants 397 * 398 *****************************************************************************/ 399 400 /* 401 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC. 402 */ 403 404 #define VNC_TIGHT_CCB_RESET_MASK (0x0f) 405 #define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4) 406 #define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4) 407 #define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4) 408 #define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4) 409 #define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4) 410 #define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4) 411 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4) 412 413 /***************************************************************************** 414 * 415 * Features 416 * 417 *****************************************************************************/ 418 419 #define VNC_FEATURE_RESIZE 0 420 #define VNC_FEATURE_HEXTILE 1 421 #define VNC_FEATURE_POINTER_TYPE_CHANGE 2 422 #define VNC_FEATURE_WMVI 3 423 #define VNC_FEATURE_TIGHT 4 424 #define VNC_FEATURE_ZLIB 5 425 #define VNC_FEATURE_COPYRECT 6 426 #define VNC_FEATURE_RICH_CURSOR 7 427 #define VNC_FEATURE_TIGHT_PNG 8 428 #define VNC_FEATURE_ZRLE 9 429 #define VNC_FEATURE_ZYWRLE 10 430 #define VNC_FEATURE_LED_STATE 11 431 432 #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE) 433 #define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE) 434 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE) 435 #define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI) 436 #define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT) 437 #define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB) 438 #define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT) 439 #define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR) 440 #define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG) 441 #define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE) 442 #define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE) 443 #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE) 444 445 446 /* Client -> Server message IDs */ 447 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0 448 #define VNC_MSG_CLIENT_SET_ENCODINGS 2 449 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3 450 #define VNC_MSG_CLIENT_KEY_EVENT 4 451 #define VNC_MSG_CLIENT_POINTER_EVENT 5 452 #define VNC_MSG_CLIENT_CUT_TEXT 6 453 #define VNC_MSG_CLIENT_VMWARE_0 127 454 #define VNC_MSG_CLIENT_CALL_CONTROL 249 455 #define VNC_MSG_CLIENT_XVP 250 456 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251 457 #define VNC_MSG_CLIENT_TIGHT 252 458 #define VNC_MSG_CLIENT_GII 253 459 #define VNC_MSG_CLIENT_VMWARE_1 254 460 #define VNC_MSG_CLIENT_QEMU 255 461 462 /* Server -> Client message IDs */ 463 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0 464 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1 465 #define VNC_MSG_SERVER_BELL 2 466 #define VNC_MSG_SERVER_CUT_TEXT 3 467 #define VNC_MSG_SERVER_VMWARE_0 127 468 #define VNC_MSG_SERVER_CALL_CONTROL 249 469 #define VNC_MSG_SERVER_XVP 250 470 #define VNC_MSG_SERVER_TIGHT 252 471 #define VNC_MSG_SERVER_GII 253 472 #define VNC_MSG_SERVER_VMWARE_1 254 473 #define VNC_MSG_SERVER_QEMU 255 474 475 476 477 /* QEMU client -> server message IDs */ 478 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0 479 #define VNC_MSG_CLIENT_QEMU_AUDIO 1 480 481 /* QEMU server -> client message IDs */ 482 #define VNC_MSG_SERVER_QEMU_AUDIO 1 483 484 485 486 /* QEMU client -> server audio message IDs */ 487 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0 488 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1 489 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2 490 491 /* QEMU server -> client audio message IDs */ 492 #define VNC_MSG_SERVER_QEMU_AUDIO_END 0 493 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1 494 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2 495 496 497 /***************************************************************************** 498 * 499 * Internal APIs 500 * 501 *****************************************************************************/ 502 503 /* Event loop functions */ 504 gboolean vnc_client_io(QIOChannel *ioc, 505 GIOCondition condition, 506 void *opaque); 507 508 ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen); 509 ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen); 510 511 /* Protocol I/O functions */ 512 void vnc_write(VncState *vs, const void *data, size_t len); 513 void vnc_write_u32(VncState *vs, uint32_t value); 514 void vnc_write_s32(VncState *vs, int32_t value); 515 void vnc_write_u16(VncState *vs, uint16_t value); 516 void vnc_write_u8(VncState *vs, uint8_t value); 517 void vnc_flush(VncState *vs); 518 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting); 519 void vnc_disconnect_finish(VncState *vs); 520 void vnc_init_state(VncState *vs); 521 522 523 /* Buffer I/O functions */ 524 uint32_t read_u32(uint8_t *data, size_t offset); 525 526 /* Protocol stage functions */ 527 void vnc_client_error(VncState *vs); 528 ssize_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp); 529 530 void start_client_init(VncState *vs); 531 void start_auth_vnc(VncState *vs); 532 533 534 /* Misc helpers */ 535 536 static inline uint32_t vnc_has_feature(VncState *vs, int feature) { 537 return (vs->features & (1 << feature)); 538 } 539 540 /* Framebuffer */ 541 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h, 542 int32_t encoding); 543 544 /* server fb is in PIXMAN_x8r8g8b8 */ 545 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8) 546 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT)) 547 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8) 548 549 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y); 550 int vnc_server_fb_stride(VncDisplay *vd); 551 552 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v); 553 double vnc_update_freq(VncState *vs, int x, int y, int w, int h); 554 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h); 555 556 /* Encodings */ 557 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 558 559 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 560 561 int vnc_hextile_send_framebuffer_update(VncState *vs, int x, 562 int y, int w, int h); 563 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic); 564 565 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size); 566 void vnc_zlib_zfree(void *x, void *addr); 567 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 568 void vnc_zlib_clear(VncState *vs); 569 570 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 571 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 572 int w, int h); 573 void vnc_tight_clear(VncState *vs); 574 575 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 576 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 577 void vnc_zrle_clear(VncState *vs); 578 579 #endif /* __QEMU_VNC_H */ 580