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 #include <stdbool.h> 42 43 #include "keymaps.h" 44 #include "vnc-palette.h" 45 #include "vnc-enc-zrle.h" 46 #include "qapi-types.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 QIOChannelSocket *lsock; 151 guint lsock_tag; 152 QIOChannelSocket *lwebsock; 153 guint lwebsock_tag; 154 bool ws_enabled; 155 DisplaySurface *ds; 156 DisplayChangeListener dcl; 157 kbd_layout_t *kbd_layout; 158 int lock_key_sync; 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 enabled; 171 bool is_unix; 172 char *password; 173 time_t expires; 174 int auth; 175 int subauth; /* Used by VeNCrypt */ 176 int ws_auth; /* Used by websockets */ 177 bool ws_tls; /* Used by websockets */ 178 bool lossy; 179 bool non_adaptive; 180 QCryptoTLSCreds *tlscreds; 181 char *tlsaclname; 182 #ifdef CONFIG_VNC_SASL 183 VncDisplaySASL sasl; 184 #endif 185 }; 186 187 typedef struct VncTight { 188 int type; 189 uint8_t quality; 190 uint8_t compression; 191 uint8_t pixel24; 192 Buffer tight; 193 Buffer tmp; 194 Buffer zlib; 195 Buffer gradient; 196 #ifdef CONFIG_VNC_JPEG 197 Buffer jpeg; 198 #endif 199 #ifdef CONFIG_VNC_PNG 200 Buffer png; 201 #endif 202 int levels[4]; 203 z_stream stream[4]; 204 } VncTight; 205 206 typedef struct VncHextile { 207 VncSendHextileTile *send_tile; 208 } VncHextile; 209 210 typedef struct VncZlib { 211 Buffer zlib; 212 Buffer tmp; 213 z_stream stream; 214 int level; 215 } VncZlib; 216 217 typedef struct VncZrle { 218 int type; 219 Buffer fb; 220 Buffer zrle; 221 Buffer tmp; 222 Buffer zlib; 223 z_stream stream; 224 VncPalette palette; 225 } VncZrle; 226 227 typedef struct VncZywrle { 228 int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT]; 229 } VncZywrle; 230 231 struct VncRect 232 { 233 int x; 234 int y; 235 int w; 236 int h; 237 }; 238 239 struct VncRectEntry 240 { 241 struct VncRect rect; 242 QLIST_ENTRY(VncRectEntry) next; 243 }; 244 245 struct VncJob 246 { 247 VncState *vs; 248 249 QLIST_HEAD(, VncRectEntry) rectangles; 250 QTAILQ_ENTRY(VncJob) next; 251 }; 252 253 struct VncState 254 { 255 QIOChannelSocket *sioc; /* The underlying socket */ 256 QIOChannel *ioc; /* The channel currently used for I/O */ 257 guint ioc_tag; 258 gboolean disconnecting; 259 260 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS); 261 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in 262 * vnc-jobs-async.c */ 263 264 VncDisplay *vd; 265 int need_update; 266 int force_update; 267 int has_dirty; 268 uint32_t features; 269 int absolute; 270 int last_x; 271 int last_y; 272 uint32_t last_bmask; 273 int client_width; 274 int client_height; 275 VncShareMode share_mode; 276 277 uint32_t vnc_encoding; 278 279 int major; 280 int minor; 281 282 int auth; 283 int subauth; /* Used by VeNCrypt */ 284 char challenge[VNC_AUTH_CHALLENGE_SIZE]; 285 QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */ 286 #ifdef CONFIG_VNC_SASL 287 VncStateSASL sasl; 288 #endif 289 bool encode_ws; 290 bool websocket; 291 292 VncClientInfo *info; 293 294 Buffer output; 295 Buffer input; 296 /* current output mode information */ 297 VncWritePixels *write_pixels; 298 PixelFormat client_pf; 299 pixman_format_code_t client_format; 300 bool client_be; 301 302 CaptureVoiceOut *audio_cap; 303 struct audsettings as; 304 305 VncReadEvent *read_handler; 306 size_t read_handler_expect; 307 /* input */ 308 uint8_t modifiers_state[256]; 309 QEMUPutLEDEntry *led; 310 311 bool abort; 312 bool initialized; 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_init_state(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