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 size_t nlsock; 150 QIOChannelSocket **lsock; 151 guint *lsock_tag; 152 size_t nlwebsock; 153 QIOChannelSocket **lwebsock; 154 guint *lwebsock_tag; 155 DisplaySurface *ds; 156 DisplayChangeListener dcl; 157 kbd_layout_t *kbd_layout; 158 int lock_key_sync; 159 QEMUPutLEDEntry *led; 160 int ledstate; 161 int key_delay_ms; 162 QemuMutex mutex; 163 164 QEMUCursor *cursor; 165 int cursor_msize; 166 uint8_t *cursor_mask; 167 168 struct VncSurface guest; /* guest visible surface (aka ds->surface) */ 169 pixman_image_t *server; /* vnc server surface */ 170 171 const char *id; 172 QTAILQ_ENTRY(VncDisplay) next; 173 bool is_unix; 174 char *password; 175 time_t expires; 176 int auth; 177 int subauth; /* Used by VeNCrypt */ 178 int ws_auth; /* Used by websockets */ 179 int ws_subauth; /* Used by websockets */ 180 bool lossy; 181 bool non_adaptive; 182 QCryptoTLSCreds *tlscreds; 183 char *tlsaclname; 184 #ifdef CONFIG_VNC_SASL 185 VncDisplaySASL sasl; 186 #endif 187 }; 188 189 typedef struct VncTight { 190 int type; 191 uint8_t quality; 192 uint8_t compression; 193 uint8_t pixel24; 194 Buffer tight; 195 Buffer tmp; 196 Buffer zlib; 197 Buffer gradient; 198 #ifdef CONFIG_VNC_JPEG 199 Buffer jpeg; 200 #endif 201 #ifdef CONFIG_VNC_PNG 202 Buffer png; 203 #endif 204 int levels[4]; 205 z_stream stream[4]; 206 } VncTight; 207 208 typedef struct VncHextile { 209 VncSendHextileTile *send_tile; 210 } VncHextile; 211 212 typedef struct VncZlib { 213 Buffer zlib; 214 Buffer tmp; 215 z_stream stream; 216 int level; 217 } VncZlib; 218 219 typedef struct VncZrle { 220 int type; 221 Buffer fb; 222 Buffer zrle; 223 Buffer tmp; 224 Buffer zlib; 225 z_stream stream; 226 VncPalette palette; 227 } VncZrle; 228 229 typedef struct VncZywrle { 230 int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT]; 231 } VncZywrle; 232 233 struct VncRect 234 { 235 int x; 236 int y; 237 int w; 238 int h; 239 }; 240 241 struct VncRectEntry 242 { 243 struct VncRect rect; 244 QLIST_ENTRY(VncRectEntry) next; 245 }; 246 247 struct VncJob 248 { 249 VncState *vs; 250 251 QLIST_HEAD(, VncRectEntry) rectangles; 252 QTAILQ_ENTRY(VncJob) next; 253 }; 254 255 struct VncState 256 { 257 QIOChannelSocket *sioc; /* The underlying socket */ 258 QIOChannel *ioc; /* The channel currently used for I/O */ 259 guint ioc_tag; 260 gboolean disconnecting; 261 262 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS); 263 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in 264 * vnc-jobs-async.c */ 265 266 VncDisplay *vd; 267 int need_update; 268 int force_update; 269 int has_dirty; 270 uint32_t features; 271 int absolute; 272 int last_x; 273 int last_y; 274 uint32_t last_bmask; 275 int client_width; 276 int client_height; 277 VncShareMode share_mode; 278 279 uint32_t vnc_encoding; 280 281 int major; 282 int minor; 283 284 int auth; 285 int subauth; /* Used by VeNCrypt */ 286 char challenge[VNC_AUTH_CHALLENGE_SIZE]; 287 QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */ 288 #ifdef CONFIG_VNC_SASL 289 VncStateSASL sasl; 290 #endif 291 bool encode_ws; 292 bool websocket; 293 294 VncClientInfo *info; 295 296 Buffer output; 297 Buffer input; 298 /* current output mode information */ 299 VncWritePixels *write_pixels; 300 PixelFormat client_pf; 301 pixman_format_code_t client_format; 302 bool client_be; 303 304 CaptureVoiceOut *audio_cap; 305 struct audsettings as; 306 307 VncReadEvent *read_handler; 308 size_t read_handler_expect; 309 /* input */ 310 uint8_t modifiers_state[256]; 311 312 bool abort; 313 QemuMutex output_mutex; 314 QEMUBH *bh; 315 Buffer jobs_buffer; 316 317 /* Encoding specific, if you add something here, don't forget to 318 * update vnc_async_encoding_start() 319 */ 320 VncTight tight; 321 VncZlib zlib; 322 VncHextile hextile; 323 VncZrle zrle; 324 VncZywrle zywrle; 325 326 Notifier mouse_mode_notifier; 327 328 QTAILQ_ENTRY(VncState) next; 329 }; 330 331 332 /***************************************************************************** 333 * 334 * Authentication modes 335 * 336 *****************************************************************************/ 337 338 enum { 339 VNC_AUTH_INVALID = 0, 340 VNC_AUTH_NONE = 1, 341 VNC_AUTH_VNC = 2, 342 VNC_AUTH_RA2 = 5, 343 VNC_AUTH_RA2NE = 6, 344 VNC_AUTH_TIGHT = 16, 345 VNC_AUTH_ULTRA = 17, 346 VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */ 347 VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */ 348 VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */ 349 }; 350 351 enum { 352 VNC_AUTH_VENCRYPT_PLAIN = 256, 353 VNC_AUTH_VENCRYPT_TLSNONE = 257, 354 VNC_AUTH_VENCRYPT_TLSVNC = 258, 355 VNC_AUTH_VENCRYPT_TLSPLAIN = 259, 356 VNC_AUTH_VENCRYPT_X509NONE = 260, 357 VNC_AUTH_VENCRYPT_X509VNC = 261, 358 VNC_AUTH_VENCRYPT_X509PLAIN = 262, 359 VNC_AUTH_VENCRYPT_X509SASL = 263, 360 VNC_AUTH_VENCRYPT_TLSSASL = 264, 361 }; 362 363 364 /***************************************************************************** 365 * 366 * Encoding types 367 * 368 *****************************************************************************/ 369 370 #define VNC_ENCODING_RAW 0x00000000 371 #define VNC_ENCODING_COPYRECT 0x00000001 372 #define VNC_ENCODING_RRE 0x00000002 373 #define VNC_ENCODING_CORRE 0x00000004 374 #define VNC_ENCODING_HEXTILE 0x00000005 375 #define VNC_ENCODING_ZLIB 0x00000006 376 #define VNC_ENCODING_TIGHT 0x00000007 377 #define VNC_ENCODING_ZLIBHEX 0x00000008 378 #define VNC_ENCODING_TRLE 0x0000000f 379 #define VNC_ENCODING_ZRLE 0x00000010 380 #define VNC_ENCODING_ZYWRLE 0x00000011 381 #define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */ 382 #define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */ 383 #define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */ 384 #define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */ 385 #define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */ 386 #define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */ 387 #define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */ 388 #define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */ 389 #define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */ 390 #define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */ 391 #define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */ 392 #define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */ 393 #define VNC_ENCODING_WMVi 0x574D5669 394 395 /***************************************************************************** 396 * 397 * Other tight constants 398 * 399 *****************************************************************************/ 400 401 /* 402 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC. 403 */ 404 405 #define VNC_TIGHT_CCB_RESET_MASK (0x0f) 406 #define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4) 407 #define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4) 408 #define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4) 409 #define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4) 410 #define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4) 411 #define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4) 412 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4) 413 414 /***************************************************************************** 415 * 416 * Features 417 * 418 *****************************************************************************/ 419 420 #define VNC_FEATURE_RESIZE 0 421 #define VNC_FEATURE_HEXTILE 1 422 #define VNC_FEATURE_POINTER_TYPE_CHANGE 2 423 #define VNC_FEATURE_WMVI 3 424 #define VNC_FEATURE_TIGHT 4 425 #define VNC_FEATURE_ZLIB 5 426 #define VNC_FEATURE_COPYRECT 6 427 #define VNC_FEATURE_RICH_CURSOR 7 428 #define VNC_FEATURE_TIGHT_PNG 8 429 #define VNC_FEATURE_ZRLE 9 430 #define VNC_FEATURE_ZYWRLE 10 431 #define VNC_FEATURE_LED_STATE 11 432 433 #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE) 434 #define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE) 435 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE) 436 #define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI) 437 #define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT) 438 #define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB) 439 #define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT) 440 #define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR) 441 #define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG) 442 #define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE) 443 #define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE) 444 #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE) 445 446 447 /* Client -> Server message IDs */ 448 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0 449 #define VNC_MSG_CLIENT_SET_ENCODINGS 2 450 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3 451 #define VNC_MSG_CLIENT_KEY_EVENT 4 452 #define VNC_MSG_CLIENT_POINTER_EVENT 5 453 #define VNC_MSG_CLIENT_CUT_TEXT 6 454 #define VNC_MSG_CLIENT_VMWARE_0 127 455 #define VNC_MSG_CLIENT_CALL_CONTROL 249 456 #define VNC_MSG_CLIENT_XVP 250 457 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251 458 #define VNC_MSG_CLIENT_TIGHT 252 459 #define VNC_MSG_CLIENT_GII 253 460 #define VNC_MSG_CLIENT_VMWARE_1 254 461 #define VNC_MSG_CLIENT_QEMU 255 462 463 /* Server -> Client message IDs */ 464 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0 465 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1 466 #define VNC_MSG_SERVER_BELL 2 467 #define VNC_MSG_SERVER_CUT_TEXT 3 468 #define VNC_MSG_SERVER_VMWARE_0 127 469 #define VNC_MSG_SERVER_CALL_CONTROL 249 470 #define VNC_MSG_SERVER_XVP 250 471 #define VNC_MSG_SERVER_TIGHT 252 472 #define VNC_MSG_SERVER_GII 253 473 #define VNC_MSG_SERVER_VMWARE_1 254 474 #define VNC_MSG_SERVER_QEMU 255 475 476 477 478 /* QEMU client -> server message IDs */ 479 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0 480 #define VNC_MSG_CLIENT_QEMU_AUDIO 1 481 482 /* QEMU server -> client message IDs */ 483 #define VNC_MSG_SERVER_QEMU_AUDIO 1 484 485 486 487 /* QEMU client -> server audio message IDs */ 488 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0 489 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1 490 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2 491 492 /* QEMU server -> client audio message IDs */ 493 #define VNC_MSG_SERVER_QEMU_AUDIO_END 0 494 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1 495 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2 496 497 498 /***************************************************************************** 499 * 500 * Internal APIs 501 * 502 *****************************************************************************/ 503 504 /* Event loop functions */ 505 gboolean vnc_client_io(QIOChannel *ioc, 506 GIOCondition condition, 507 void *opaque); 508 509 ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen); 510 ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen); 511 512 /* Protocol I/O functions */ 513 void vnc_write(VncState *vs, const void *data, size_t len); 514 void vnc_write_u32(VncState *vs, uint32_t value); 515 void vnc_write_s32(VncState *vs, int32_t value); 516 void vnc_write_u16(VncState *vs, uint16_t value); 517 void vnc_write_u8(VncState *vs, uint8_t value); 518 void vnc_flush(VncState *vs); 519 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting); 520 void vnc_disconnect_finish(VncState *vs); 521 void vnc_start_protocol(VncState *vs); 522 523 524 /* Buffer I/O functions */ 525 uint32_t read_u32(uint8_t *data, size_t offset); 526 527 /* Protocol stage functions */ 528 void vnc_client_error(VncState *vs); 529 ssize_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp); 530 531 void start_client_init(VncState *vs); 532 void start_auth_vnc(VncState *vs); 533 534 535 /* Misc helpers */ 536 537 static inline uint32_t vnc_has_feature(VncState *vs, int feature) { 538 return (vs->features & (1 << feature)); 539 } 540 541 /* Framebuffer */ 542 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h, 543 int32_t encoding); 544 545 /* server fb is in PIXMAN_x8r8g8b8 */ 546 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8) 547 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT)) 548 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8) 549 550 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y); 551 int vnc_server_fb_stride(VncDisplay *vd); 552 553 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v); 554 double vnc_update_freq(VncState *vs, int x, int y, int w, int h); 555 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h); 556 557 /* Encodings */ 558 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 559 560 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 561 562 int vnc_hextile_send_framebuffer_update(VncState *vs, int x, 563 int y, int w, int h); 564 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic); 565 566 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size); 567 void vnc_zlib_zfree(void *x, void *addr); 568 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 569 void vnc_zlib_clear(VncState *vs); 570 571 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 572 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 573 int w, int h); 574 void vnc_tight_clear(VncState *vs); 575 576 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 577 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 578 void vnc_zrle_clear(VncState *vs); 579 580 #endif /* QEMU_VNC_H */ 581