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 <zlib.h> 39 #include <stdbool.h> 40 41 #include "keymaps.h" 42 #include "vnc-palette.h" 43 #include "vnc-enc-zrle.h" 44 #include "qapi-types.h" 45 46 // #define _VNC_DEBUG 1 47 48 #ifdef _VNC_DEBUG 49 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) 50 #else 51 #define VNC_DEBUG(fmt, ...) do { } while (0) 52 #endif 53 54 /***************************************************************************** 55 * 56 * Core data structures 57 * 58 *****************************************************************************/ 59 60 typedef struct VncState VncState; 61 typedef struct VncJob VncJob; 62 typedef struct VncRect VncRect; 63 typedef struct VncRectEntry VncRectEntry; 64 65 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len); 66 67 typedef void VncWritePixels(VncState *vs, void *data, int size); 68 69 typedef void VncSendHextileTile(VncState *vs, 70 int x, int y, int w, int h, 71 void *last_bg, 72 void *last_fg, 73 int *has_bg, int *has_fg); 74 75 /* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented 76 * by one bit in the dirty bitmap, should be a power of 2 */ 77 #define VNC_DIRTY_PIXELS_PER_BIT 16 78 79 /* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */ 80 81 #define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT) 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 / VNC_DIRTY_PIXELS_PER_BIT) 86 87 /* VNC_DIRTY_BPL (BPL = bits per line) might be greater than 88 * VNC_DIRTY_BITS due to alignment */ 89 #define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE) 90 91 #define VNC_STAT_RECT 64 92 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT) 93 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT) 94 95 #define VNC_AUTH_CHALLENGE_SIZE 16 96 97 typedef struct VncDisplay VncDisplay; 98 99 #include "vnc-auth-vencrypt.h" 100 #ifdef CONFIG_VNC_SASL 101 #include "vnc-auth-sasl.h" 102 #endif 103 #include "vnc-ws.h" 104 105 struct VncRectStat 106 { 107 /* time of last 10 updates, to find update frequency */ 108 struct timeval times[10]; 109 int idx; 110 111 double freq; /* Update frequency (in Hz) */ 112 bool updated; /* Already updated during this refresh */ 113 }; 114 115 typedef struct VncRectStat VncRectStat; 116 117 struct VncSurface 118 { 119 struct timeval last_freq_check; 120 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], 121 VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT); 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_connecting; 144 int num_shared; 145 int num_exclusive; 146 int connections_limit; 147 VncSharePolicy share_policy; 148 int lsock; 149 int lwebsock; 150 bool ws_enabled; 151 DisplaySurface *ds; 152 DisplayChangeListener dcl; 153 kbd_layout_t *kbd_layout; 154 int lock_key_sync; 155 QemuMutex mutex; 156 157 QEMUCursor *cursor; 158 int cursor_msize; 159 uint8_t *cursor_mask; 160 161 struct VncSurface guest; /* guest visible surface (aka ds->surface) */ 162 pixman_image_t *server; /* vnc server surface */ 163 164 const char *id; 165 QTAILQ_ENTRY(VncDisplay) next; 166 bool enabled; 167 bool is_unix; 168 char *password; 169 time_t expires; 170 int auth; 171 int subauth; /* Used by VeNCrypt */ 172 int ws_auth; /* Used by websockets */ 173 bool ws_tls; /* Used by websockets */ 174 bool lossy; 175 bool non_adaptive; 176 QCryptoTLSCreds *tlscreds; 177 char *tlsaclname; 178 #ifdef CONFIG_VNC_SASL 179 VncDisplaySASL sasl; 180 #endif 181 }; 182 183 typedef struct VncTight { 184 int type; 185 uint8_t quality; 186 uint8_t compression; 187 uint8_t pixel24; 188 Buffer tight; 189 Buffer tmp; 190 Buffer zlib; 191 Buffer gradient; 192 #ifdef CONFIG_VNC_JPEG 193 Buffer jpeg; 194 #endif 195 #ifdef CONFIG_VNC_PNG 196 Buffer png; 197 #endif 198 int levels[4]; 199 z_stream stream[4]; 200 } VncTight; 201 202 typedef struct VncHextile { 203 VncSendHextileTile *send_tile; 204 } VncHextile; 205 206 typedef struct VncZlib { 207 Buffer zlib; 208 Buffer tmp; 209 z_stream stream; 210 int level; 211 } VncZlib; 212 213 typedef struct VncZrle { 214 int type; 215 Buffer fb; 216 Buffer zrle; 217 Buffer tmp; 218 Buffer zlib; 219 z_stream stream; 220 VncPalette palette; 221 } VncZrle; 222 223 typedef struct VncZywrle { 224 int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT]; 225 } VncZywrle; 226 227 struct VncRect 228 { 229 int x; 230 int y; 231 int w; 232 int h; 233 }; 234 235 struct VncRectEntry 236 { 237 struct VncRect rect; 238 QLIST_ENTRY(VncRectEntry) next; 239 }; 240 241 struct VncJob 242 { 243 VncState *vs; 244 245 QLIST_HEAD(, VncRectEntry) rectangles; 246 QTAILQ_ENTRY(VncJob) next; 247 }; 248 249 struct VncState 250 { 251 int csock; 252 253 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS); 254 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in 255 * vnc-jobs-async.c */ 256 257 VncDisplay *vd; 258 int need_update; 259 int force_update; 260 int has_dirty; 261 uint32_t features; 262 int absolute; 263 int last_x; 264 int last_y; 265 uint32_t last_bmask; 266 int client_width; 267 int client_height; 268 VncShareMode share_mode; 269 270 uint32_t vnc_encoding; 271 272 int major; 273 int minor; 274 275 int auth; 276 int subauth; /* Used by VeNCrypt */ 277 char challenge[VNC_AUTH_CHALLENGE_SIZE]; 278 QCryptoTLSSession *tls; 279 #ifdef CONFIG_VNC_SASL 280 VncStateSASL sasl; 281 #endif 282 bool encode_ws; 283 bool websocket; 284 285 VncClientInfo *info; 286 287 Buffer output; 288 Buffer input; 289 Buffer ws_input; 290 Buffer ws_output; 291 size_t ws_payload_remain; 292 WsMask ws_payload_mask; 293 /* current output mode information */ 294 VncWritePixels *write_pixels; 295 PixelFormat client_pf; 296 pixman_format_code_t client_format; 297 bool client_be; 298 299 CaptureVoiceOut *audio_cap; 300 struct audsettings as; 301 302 VncReadEvent *read_handler; 303 size_t read_handler_expect; 304 /* input */ 305 uint8_t modifiers_state[256]; 306 QEMUPutLEDEntry *led; 307 308 bool abort; 309 bool initialized; 310 QemuMutex output_mutex; 311 QEMUBH *bh; 312 Buffer jobs_buffer; 313 314 /* Encoding specific, if you add something here, don't forget to 315 * update vnc_async_encoding_start() 316 */ 317 VncTight tight; 318 VncZlib zlib; 319 VncHextile hextile; 320 VncZrle zrle; 321 VncZywrle zywrle; 322 323 Notifier mouse_mode_notifier; 324 325 QTAILQ_ENTRY(VncState) next; 326 }; 327 328 329 /***************************************************************************** 330 * 331 * Authentication modes 332 * 333 *****************************************************************************/ 334 335 enum { 336 VNC_AUTH_INVALID = 0, 337 VNC_AUTH_NONE = 1, 338 VNC_AUTH_VNC = 2, 339 VNC_AUTH_RA2 = 5, 340 VNC_AUTH_RA2NE = 6, 341 VNC_AUTH_TIGHT = 16, 342 VNC_AUTH_ULTRA = 17, 343 VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */ 344 VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */ 345 VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */ 346 }; 347 348 enum { 349 VNC_AUTH_VENCRYPT_PLAIN = 256, 350 VNC_AUTH_VENCRYPT_TLSNONE = 257, 351 VNC_AUTH_VENCRYPT_TLSVNC = 258, 352 VNC_AUTH_VENCRYPT_TLSPLAIN = 259, 353 VNC_AUTH_VENCRYPT_X509NONE = 260, 354 VNC_AUTH_VENCRYPT_X509VNC = 261, 355 VNC_AUTH_VENCRYPT_X509PLAIN = 262, 356 VNC_AUTH_VENCRYPT_X509SASL = 263, 357 VNC_AUTH_VENCRYPT_TLSSASL = 264, 358 }; 359 360 361 /***************************************************************************** 362 * 363 * Encoding types 364 * 365 *****************************************************************************/ 366 367 #define VNC_ENCODING_RAW 0x00000000 368 #define VNC_ENCODING_COPYRECT 0x00000001 369 #define VNC_ENCODING_RRE 0x00000002 370 #define VNC_ENCODING_CORRE 0x00000004 371 #define VNC_ENCODING_HEXTILE 0x00000005 372 #define VNC_ENCODING_ZLIB 0x00000006 373 #define VNC_ENCODING_TIGHT 0x00000007 374 #define VNC_ENCODING_ZLIBHEX 0x00000008 375 #define VNC_ENCODING_TRLE 0x0000000f 376 #define VNC_ENCODING_ZRLE 0x00000010 377 #define VNC_ENCODING_ZYWRLE 0x00000011 378 #define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */ 379 #define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */ 380 #define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */ 381 #define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */ 382 #define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */ 383 #define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */ 384 #define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */ 385 #define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */ 386 #define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */ 387 #define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */ 388 #define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */ 389 #define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */ 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 #define VNC_FEATURE_LED_STATE 11 429 430 #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE) 431 #define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE) 432 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE) 433 #define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI) 434 #define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT) 435 #define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB) 436 #define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT) 437 #define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR) 438 #define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG) 439 #define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE) 440 #define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE) 441 #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE) 442 443 444 /* Client -> Server message IDs */ 445 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0 446 #define VNC_MSG_CLIENT_SET_ENCODINGS 2 447 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3 448 #define VNC_MSG_CLIENT_KEY_EVENT 4 449 #define VNC_MSG_CLIENT_POINTER_EVENT 5 450 #define VNC_MSG_CLIENT_CUT_TEXT 6 451 #define VNC_MSG_CLIENT_VMWARE_0 127 452 #define VNC_MSG_CLIENT_CALL_CONTROL 249 453 #define VNC_MSG_CLIENT_XVP 250 454 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251 455 #define VNC_MSG_CLIENT_TIGHT 252 456 #define VNC_MSG_CLIENT_GII 253 457 #define VNC_MSG_CLIENT_VMWARE_1 254 458 #define VNC_MSG_CLIENT_QEMU 255 459 460 /* Server -> Client message IDs */ 461 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0 462 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1 463 #define VNC_MSG_SERVER_BELL 2 464 #define VNC_MSG_SERVER_CUT_TEXT 3 465 #define VNC_MSG_SERVER_VMWARE_0 127 466 #define VNC_MSG_SERVER_CALL_CONTROL 249 467 #define VNC_MSG_SERVER_XVP 250 468 #define VNC_MSG_SERVER_TIGHT 252 469 #define VNC_MSG_SERVER_GII 253 470 #define VNC_MSG_SERVER_VMWARE_1 254 471 #define VNC_MSG_SERVER_QEMU 255 472 473 474 475 /* QEMU client -> server message IDs */ 476 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0 477 #define VNC_MSG_CLIENT_QEMU_AUDIO 1 478 479 /* QEMU server -> client message IDs */ 480 #define VNC_MSG_SERVER_QEMU_AUDIO 1 481 482 483 484 /* QEMU client -> server audio message IDs */ 485 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0 486 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1 487 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2 488 489 /* QEMU server -> client audio message IDs */ 490 #define VNC_MSG_SERVER_QEMU_AUDIO_END 0 491 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1 492 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2 493 494 495 /***************************************************************************** 496 * 497 * Internal APIs 498 * 499 *****************************************************************************/ 500 501 /* Event loop functions */ 502 void vnc_client_read(void *opaque); 503 void vnc_client_write(void *opaque); 504 505 ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen); 506 ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen); 507 ssize_t vnc_tls_pull(char *buf, size_t len, void *opaque); 508 ssize_t vnc_tls_push(const char *buf, size_t len, void *opaque); 509 510 /* Protocol I/O functions */ 511 void vnc_write(VncState *vs, const void *data, size_t len); 512 void vnc_write_u32(VncState *vs, uint32_t value); 513 void vnc_write_s32(VncState *vs, int32_t value); 514 void vnc_write_u16(VncState *vs, uint16_t value); 515 void vnc_write_u8(VncState *vs, uint8_t value); 516 void vnc_flush(VncState *vs); 517 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting); 518 void vnc_disconnect_finish(VncState *vs); 519 void vnc_init_state(VncState *vs); 520 521 522 /* Buffer I/O functions */ 523 uint32_t read_u32(uint8_t *data, size_t offset); 524 525 /* Protocol stage functions */ 526 void vnc_client_error(VncState *vs); 527 ssize_t vnc_client_io_error(VncState *vs, ssize_t ret, int last_errno); 528 529 void start_client_init(VncState *vs); 530 void start_auth_vnc(VncState *vs); 531 532 533 /* Misc helpers */ 534 535 char *vnc_socket_local_addr(const char *format, int fd); 536 char *vnc_socket_remote_addr(const char *format, int fd); 537 538 static inline uint32_t vnc_has_feature(VncState *vs, int feature) { 539 return (vs->features & (1 << feature)); 540 } 541 542 /* Framebuffer */ 543 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h, 544 int32_t encoding); 545 546 /* server fb is in PIXMAN_x8r8g8b8 */ 547 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8) 548 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT)) 549 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8) 550 551 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y); 552 int vnc_server_fb_stride(VncDisplay *vd); 553 554 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v); 555 double vnc_update_freq(VncState *vs, int x, int y, int w, int h); 556 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h); 557 558 /* Encodings */ 559 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 560 561 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 562 563 int vnc_hextile_send_framebuffer_update(VncState *vs, int x, 564 int y, int w, int h); 565 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic); 566 567 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size); 568 void vnc_zlib_zfree(void *x, void *addr); 569 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 570 void vnc_zlib_clear(VncState *vs); 571 572 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 573 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 574 int w, int h); 575 void vnc_tight_clear(VncState *vs); 576 577 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 578 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 579 void vnc_zrle_clear(VncState *vs); 580 581 #endif /* __QEMU_VNC_H */ 582