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 DisplaySurface *ds; 154 DisplayChangeListener dcl; 155 kbd_layout_t *kbd_layout; 156 int lock_key_sync; 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 struct VncState 252 { 253 QIOChannelSocket *sioc; /* The underlying socket */ 254 QIOChannel *ioc; /* The channel currently used for I/O */ 255 guint ioc_tag; 256 gboolean disconnecting; 257 258 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS); 259 uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in 260 * vnc-jobs-async.c */ 261 262 VncDisplay *vd; 263 int need_update; 264 int force_update; 265 int has_dirty; 266 uint32_t features; 267 int absolute; 268 int last_x; 269 int last_y; 270 uint32_t last_bmask; 271 int client_width; 272 int client_height; 273 VncShareMode share_mode; 274 275 uint32_t vnc_encoding; 276 277 int major; 278 int minor; 279 280 int auth; 281 int subauth; /* Used by VeNCrypt */ 282 char challenge[VNC_AUTH_CHALLENGE_SIZE]; 283 QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */ 284 #ifdef CONFIG_VNC_SASL 285 VncStateSASL sasl; 286 #endif 287 bool encode_ws; 288 bool websocket; 289 290 VncClientInfo *info; 291 292 Buffer output; 293 Buffer input; 294 /* current output mode information */ 295 VncWritePixels *write_pixels; 296 PixelFormat client_pf; 297 pixman_format_code_t client_format; 298 bool client_be; 299 300 CaptureVoiceOut *audio_cap; 301 struct audsettings as; 302 303 VncReadEvent *read_handler; 304 size_t read_handler_expect; 305 /* input */ 306 uint8_t modifiers_state[256]; 307 QEMUPutLEDEntry *led; 308 309 bool abort; 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 gboolean vnc_client_io(QIOChannel *ioc, 503 GIOCondition condition, 504 void *opaque); 505 506 ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen); 507 ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen); 508 509 /* Protocol I/O functions */ 510 void vnc_write(VncState *vs, const void *data, size_t len); 511 void vnc_write_u32(VncState *vs, uint32_t value); 512 void vnc_write_s32(VncState *vs, int32_t value); 513 void vnc_write_u16(VncState *vs, uint16_t value); 514 void vnc_write_u8(VncState *vs, uint8_t value); 515 void vnc_flush(VncState *vs); 516 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting); 517 void vnc_disconnect_finish(VncState *vs); 518 void vnc_start_protocol(VncState *vs); 519 520 521 /* Buffer I/O functions */ 522 uint32_t read_u32(uint8_t *data, size_t offset); 523 524 /* Protocol stage functions */ 525 void vnc_client_error(VncState *vs); 526 ssize_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp); 527 528 void start_client_init(VncState *vs); 529 void start_auth_vnc(VncState *vs); 530 531 532 /* Misc helpers */ 533 534 static inline uint32_t vnc_has_feature(VncState *vs, int feature) { 535 return (vs->features & (1 << feature)); 536 } 537 538 /* Framebuffer */ 539 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h, 540 int32_t encoding); 541 542 /* server fb is in PIXMAN_x8r8g8b8 */ 543 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8) 544 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT)) 545 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8) 546 547 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y); 548 int vnc_server_fb_stride(VncDisplay *vd); 549 550 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v); 551 double vnc_update_freq(VncState *vs, int x, int y, int w, int h); 552 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h); 553 554 /* Encodings */ 555 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 556 557 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 558 559 int vnc_hextile_send_framebuffer_update(VncState *vs, int x, 560 int y, int w, int h); 561 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic); 562 563 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size); 564 void vnc_zlib_zfree(void *x, void *addr); 565 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 566 void vnc_zlib_clear(VncState *vs); 567 568 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 569 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 570 int w, int h); 571 void vnc_tight_clear(VncState *vs); 572 573 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 574 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 575 void vnc_zrle_clear(VncState *vs); 576 577 #endif /* QEMU_VNC_H */ 578