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 <zlib.h> 37 #include <stdbool.h> 38 39 #include "keymaps.h" 40 #include "vnc-palette.h" 41 #include "vnc-enc-zrle.h" 42 #include "qapi-types.h" 43 44 // #define _VNC_DEBUG 1 45 46 #ifdef _VNC_DEBUG 47 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) 48 #else 49 #define VNC_DEBUG(fmt, ...) do { } while (0) 50 #endif 51 52 /***************************************************************************** 53 * 54 * Core data structures 55 * 56 *****************************************************************************/ 57 58 typedef struct Buffer 59 { 60 size_t capacity; 61 size_t offset; 62 uint8_t *buffer; 63 } Buffer; 64 65 typedef struct VncState VncState; 66 typedef struct VncJob VncJob; 67 typedef struct VncRect VncRect; 68 typedef struct VncRectEntry VncRectEntry; 69 70 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len); 71 72 typedef void VncWritePixels(VncState *vs, void *data, int size); 73 74 typedef void VncSendHextileTile(VncState *vs, 75 int x, int y, int w, int h, 76 void *last_bg, 77 void *last_fg, 78 int *has_bg, int *has_fg); 79 80 /* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented 81 * by one bit in the dirty bitmap, should be a power of 2 */ 82 #define VNC_DIRTY_PIXELS_PER_BIT 16 83 84 /* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */ 85 86 #define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT) 87 #define VNC_MAX_HEIGHT 2048 88 89 /* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */ 90 #define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT) 91 92 /* VNC_DIRTY_BPL (BPL = bits per line) might be greater than 93 * VNC_DIRTY_BITS due to alignment */ 94 #define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE) 95 96 #define VNC_STAT_RECT 64 97 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT) 98 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT) 99 100 #define VNC_AUTH_CHALLENGE_SIZE 16 101 102 typedef struct VncDisplay VncDisplay; 103 104 #ifdef CONFIG_VNC_TLS 105 #include "vnc-tls.h" 106 #include "vnc-auth-vencrypt.h" 107 #endif 108 #ifdef CONFIG_VNC_SASL 109 #include "vnc-auth-sasl.h" 110 #endif 111 #include "vnc-ws.h" 112 113 struct VncRectStat 114 { 115 /* time of last 10 updates, to find update frequency */ 116 struct timeval times[10]; 117 int idx; 118 119 double freq; /* Update frequency (in Hz) */ 120 bool updated; /* Already updated during this refresh */ 121 }; 122 123 typedef struct VncRectStat VncRectStat; 124 125 struct VncSurface 126 { 127 struct timeval last_freq_check; 128 DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], 129 VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT); 130 VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS]; 131 pixman_image_t *fb; 132 pixman_format_code_t format; 133 }; 134 135 typedef enum VncShareMode { 136 VNC_SHARE_MODE_CONNECTING = 1, 137 VNC_SHARE_MODE_SHARED, 138 VNC_SHARE_MODE_EXCLUSIVE, 139 VNC_SHARE_MODE_DISCONNECTED, 140 } VncShareMode; 141 142 typedef enum VncSharePolicy { 143 VNC_SHARE_POLICY_IGNORE = 1, 144 VNC_SHARE_POLICY_ALLOW_EXCLUSIVE, 145 VNC_SHARE_POLICY_FORCE_SHARED, 146 } VncSharePolicy; 147 148 struct VncDisplay 149 { 150 QTAILQ_HEAD(, VncState) clients; 151 int num_connecting; 152 int num_shared; 153 int num_exclusive; 154 int connections_limit; 155 VncSharePolicy share_policy; 156 int lsock; 157 int lwebsock; 158 bool ws_enabled; 159 DisplaySurface *ds; 160 DisplayChangeListener dcl; 161 kbd_layout_t *kbd_layout; 162 int lock_key_sync; 163 QemuMutex mutex; 164 165 QEMUCursor *cursor; 166 int cursor_msize; 167 uint8_t *cursor_mask; 168 169 struct VncSurface guest; /* guest visible surface (aka ds->surface) */ 170 pixman_image_t *server; /* vnc server surface */ 171 172 const char *id; 173 QTAILQ_ENTRY(VncDisplay) next; 174 bool enabled; 175 bool is_unix; 176 char *password; 177 time_t expires; 178 int auth; 179 int subauth; /* Used by VeNCrypt */ 180 int ws_auth; /* Used by websockets */ 181 bool ws_tls; /* Used by websockets */ 182 bool lossy; 183 bool non_adaptive; 184 #ifdef CONFIG_VNC_TLS 185 VncDisplayTLS tls; 186 #endif 187 #ifdef CONFIG_VNC_SASL 188 VncDisplaySASL sasl; 189 #endif 190 }; 191 192 typedef struct VncTight { 193 int type; 194 uint8_t quality; 195 uint8_t compression; 196 uint8_t pixel24; 197 Buffer tight; 198 Buffer tmp; 199 Buffer zlib; 200 Buffer gradient; 201 #ifdef CONFIG_VNC_JPEG 202 Buffer jpeg; 203 #endif 204 #ifdef CONFIG_VNC_PNG 205 Buffer png; 206 #endif 207 int levels[4]; 208 z_stream stream[4]; 209 } VncTight; 210 211 typedef struct VncHextile { 212 VncSendHextileTile *send_tile; 213 } VncHextile; 214 215 typedef struct VncZlib { 216 Buffer zlib; 217 Buffer tmp; 218 z_stream stream; 219 int level; 220 } VncZlib; 221 222 typedef struct VncZrle { 223 int type; 224 Buffer fb; 225 Buffer zrle; 226 Buffer tmp; 227 Buffer zlib; 228 z_stream stream; 229 VncPalette palette; 230 } VncZrle; 231 232 typedef struct VncZywrle { 233 int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT]; 234 } VncZywrle; 235 236 struct VncRect 237 { 238 int x; 239 int y; 240 int w; 241 int h; 242 }; 243 244 struct VncRectEntry 245 { 246 struct VncRect rect; 247 QLIST_ENTRY(VncRectEntry) next; 248 }; 249 250 struct VncJob 251 { 252 VncState *vs; 253 254 QLIST_HEAD(, VncRectEntry) rectangles; 255 QTAILQ_ENTRY(VncJob) next; 256 }; 257 258 struct VncState 259 { 260 int csock; 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 #ifdef CONFIG_VNC_TLS 288 VncStateTLS tls; 289 #endif 290 #ifdef CONFIG_VNC_SASL 291 VncStateSASL sasl; 292 #endif 293 bool encode_ws; 294 bool websocket; 295 296 VncClientInfo *info; 297 298 Buffer output; 299 Buffer input; 300 Buffer ws_input; 301 Buffer ws_output; 302 size_t ws_payload_remain; 303 WsMask ws_payload_mask; 304 /* current output mode information */ 305 VncWritePixels *write_pixels; 306 PixelFormat client_pf; 307 pixman_format_code_t client_format; 308 bool client_be; 309 310 CaptureVoiceOut *audio_cap; 311 struct audsettings as; 312 313 VncReadEvent *read_handler; 314 size_t read_handler_expect; 315 /* input */ 316 uint8_t modifiers_state[256]; 317 QEMUPutLEDEntry *led; 318 319 bool abort; 320 bool initialized; 321 QemuMutex output_mutex; 322 QEMUBH *bh; 323 Buffer jobs_buffer; 324 325 /* Encoding specific, if you add something here, don't forget to 326 * update vnc_async_encoding_start() 327 */ 328 VncTight tight; 329 VncZlib zlib; 330 VncHextile hextile; 331 VncZrle zrle; 332 VncZywrle zywrle; 333 334 Notifier mouse_mode_notifier; 335 336 QTAILQ_ENTRY(VncState) next; 337 }; 338 339 340 /***************************************************************************** 341 * 342 * Authentication modes 343 * 344 *****************************************************************************/ 345 346 enum { 347 VNC_AUTH_INVALID = 0, 348 VNC_AUTH_NONE = 1, 349 VNC_AUTH_VNC = 2, 350 VNC_AUTH_RA2 = 5, 351 VNC_AUTH_RA2NE = 6, 352 VNC_AUTH_TIGHT = 16, 353 VNC_AUTH_ULTRA = 17, 354 VNC_AUTH_TLS = 18, /* Supported in GTK-VNC & VINO */ 355 VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */ 356 VNC_AUTH_SASL = 20, /* Supported in GTK-VNC & VINO */ 357 }; 358 359 enum { 360 VNC_AUTH_VENCRYPT_PLAIN = 256, 361 VNC_AUTH_VENCRYPT_TLSNONE = 257, 362 VNC_AUTH_VENCRYPT_TLSVNC = 258, 363 VNC_AUTH_VENCRYPT_TLSPLAIN = 259, 364 VNC_AUTH_VENCRYPT_X509NONE = 260, 365 VNC_AUTH_VENCRYPT_X509VNC = 261, 366 VNC_AUTH_VENCRYPT_X509PLAIN = 262, 367 VNC_AUTH_VENCRYPT_X509SASL = 263, 368 VNC_AUTH_VENCRYPT_TLSSASL = 264, 369 }; 370 371 372 /***************************************************************************** 373 * 374 * Encoding types 375 * 376 *****************************************************************************/ 377 378 #define VNC_ENCODING_RAW 0x00000000 379 #define VNC_ENCODING_COPYRECT 0x00000001 380 #define VNC_ENCODING_RRE 0x00000002 381 #define VNC_ENCODING_CORRE 0x00000004 382 #define VNC_ENCODING_HEXTILE 0x00000005 383 #define VNC_ENCODING_ZLIB 0x00000006 384 #define VNC_ENCODING_TIGHT 0x00000007 385 #define VNC_ENCODING_ZLIBHEX 0x00000008 386 #define VNC_ENCODING_TRLE 0x0000000f 387 #define VNC_ENCODING_ZRLE 0x00000010 388 #define VNC_ENCODING_ZYWRLE 0x00000011 389 #define VNC_ENCODING_COMPRESSLEVEL0 0xFFFFFF00 /* -256 */ 390 #define VNC_ENCODING_QUALITYLEVEL0 0xFFFFFFE0 /* -32 */ 391 #define VNC_ENCODING_XCURSOR 0xFFFFFF10 /* -240 */ 392 #define VNC_ENCODING_RICH_CURSOR 0xFFFFFF11 /* -239 */ 393 #define VNC_ENCODING_POINTER_POS 0xFFFFFF18 /* -232 */ 394 #define VNC_ENCODING_LASTRECT 0xFFFFFF20 /* -224 */ 395 #define VNC_ENCODING_DESKTOPRESIZE 0xFFFFFF21 /* -223 */ 396 #define VNC_ENCODING_POINTER_TYPE_CHANGE 0XFFFFFEFF /* -257 */ 397 #define VNC_ENCODING_EXT_KEY_EVENT 0XFFFFFEFE /* -258 */ 398 #define VNC_ENCODING_AUDIO 0XFFFFFEFD /* -259 */ 399 #define VNC_ENCODING_TIGHT_PNG 0xFFFFFEFC /* -260 */ 400 #define VNC_ENCODING_LED_STATE 0XFFFFFEFB /* -261 */ 401 #define VNC_ENCODING_WMVi 0x574D5669 402 403 /***************************************************************************** 404 * 405 * Other tight constants 406 * 407 *****************************************************************************/ 408 409 /* 410 * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC. 411 */ 412 413 #define VNC_TIGHT_CCB_RESET_MASK (0x0f) 414 #define VNC_TIGHT_CCB_TYPE_MASK (0x0f << 4) 415 #define VNC_TIGHT_CCB_TYPE_FILL (0x08 << 4) 416 #define VNC_TIGHT_CCB_TYPE_JPEG (0x09 << 4) 417 #define VNC_TIGHT_CCB_TYPE_PNG (0x0A << 4) 418 #define VNC_TIGHT_CCB_BASIC_MAX (0x07 << 4) 419 #define VNC_TIGHT_CCB_BASIC_ZLIB (0x03 << 4) 420 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4) 421 422 /***************************************************************************** 423 * 424 * Features 425 * 426 *****************************************************************************/ 427 428 #define VNC_FEATURE_RESIZE 0 429 #define VNC_FEATURE_HEXTILE 1 430 #define VNC_FEATURE_POINTER_TYPE_CHANGE 2 431 #define VNC_FEATURE_WMVI 3 432 #define VNC_FEATURE_TIGHT 4 433 #define VNC_FEATURE_ZLIB 5 434 #define VNC_FEATURE_COPYRECT 6 435 #define VNC_FEATURE_RICH_CURSOR 7 436 #define VNC_FEATURE_TIGHT_PNG 8 437 #define VNC_FEATURE_ZRLE 9 438 #define VNC_FEATURE_ZYWRLE 10 439 #define VNC_FEATURE_LED_STATE 11 440 441 #define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE) 442 #define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE) 443 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE) 444 #define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI) 445 #define VNC_FEATURE_TIGHT_MASK (1 << VNC_FEATURE_TIGHT) 446 #define VNC_FEATURE_ZLIB_MASK (1 << VNC_FEATURE_ZLIB) 447 #define VNC_FEATURE_COPYRECT_MASK (1 << VNC_FEATURE_COPYRECT) 448 #define VNC_FEATURE_RICH_CURSOR_MASK (1 << VNC_FEATURE_RICH_CURSOR) 449 #define VNC_FEATURE_TIGHT_PNG_MASK (1 << VNC_FEATURE_TIGHT_PNG) 450 #define VNC_FEATURE_ZRLE_MASK (1 << VNC_FEATURE_ZRLE) 451 #define VNC_FEATURE_ZYWRLE_MASK (1 << VNC_FEATURE_ZYWRLE) 452 #define VNC_FEATURE_LED_STATE_MASK (1 << VNC_FEATURE_LED_STATE) 453 454 455 /* Client -> Server message IDs */ 456 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT 0 457 #define VNC_MSG_CLIENT_SET_ENCODINGS 2 458 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3 459 #define VNC_MSG_CLIENT_KEY_EVENT 4 460 #define VNC_MSG_CLIENT_POINTER_EVENT 5 461 #define VNC_MSG_CLIENT_CUT_TEXT 6 462 #define VNC_MSG_CLIENT_VMWARE_0 127 463 #define VNC_MSG_CLIENT_CALL_CONTROL 249 464 #define VNC_MSG_CLIENT_XVP 250 465 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE 251 466 #define VNC_MSG_CLIENT_TIGHT 252 467 #define VNC_MSG_CLIENT_GII 253 468 #define VNC_MSG_CLIENT_VMWARE_1 254 469 #define VNC_MSG_CLIENT_QEMU 255 470 471 /* Server -> Client message IDs */ 472 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE 0 473 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES 1 474 #define VNC_MSG_SERVER_BELL 2 475 #define VNC_MSG_SERVER_CUT_TEXT 3 476 #define VNC_MSG_SERVER_VMWARE_0 127 477 #define VNC_MSG_SERVER_CALL_CONTROL 249 478 #define VNC_MSG_SERVER_XVP 250 479 #define VNC_MSG_SERVER_TIGHT 252 480 #define VNC_MSG_SERVER_GII 253 481 #define VNC_MSG_SERVER_VMWARE_1 254 482 #define VNC_MSG_SERVER_QEMU 255 483 484 485 486 /* QEMU client -> server message IDs */ 487 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT 0 488 #define VNC_MSG_CLIENT_QEMU_AUDIO 1 489 490 /* QEMU server -> client message IDs */ 491 #define VNC_MSG_SERVER_QEMU_AUDIO 1 492 493 494 495 /* QEMU client -> server audio message IDs */ 496 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE 0 497 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE 1 498 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT 2 499 500 /* QEMU server -> client audio message IDs */ 501 #define VNC_MSG_SERVER_QEMU_AUDIO_END 0 502 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN 1 503 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA 2 504 505 506 /***************************************************************************** 507 * 508 * Internal APIs 509 * 510 *****************************************************************************/ 511 512 /* Event loop functions */ 513 void vnc_client_read(void *opaque); 514 void vnc_client_write(void *opaque); 515 516 long vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen); 517 long vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen); 518 519 /* Protocol I/O functions */ 520 void vnc_write(VncState *vs, const void *data, size_t len); 521 void vnc_write_u32(VncState *vs, uint32_t value); 522 void vnc_write_s32(VncState *vs, int32_t value); 523 void vnc_write_u16(VncState *vs, uint16_t value); 524 void vnc_write_u8(VncState *vs, uint8_t value); 525 void vnc_flush(VncState *vs); 526 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting); 527 void vnc_disconnect_finish(VncState *vs); 528 void vnc_init_state(VncState *vs); 529 530 531 /* Buffer I/O functions */ 532 uint32_t read_u32(uint8_t *data, size_t offset); 533 534 /* Protocol stage functions */ 535 void vnc_client_error(VncState *vs); 536 int vnc_client_io_error(VncState *vs, int ret, int last_errno); 537 538 void start_client_init(VncState *vs); 539 void start_auth_vnc(VncState *vs); 540 541 /* Buffer management */ 542 void buffer_reserve(Buffer *buffer, size_t len); 543 void buffer_reset(Buffer *buffer); 544 void buffer_free(Buffer *buffer); 545 void buffer_append(Buffer *buffer, const void *data, size_t len); 546 void buffer_advance(Buffer *buf, size_t len); 547 uint8_t *buffer_end(Buffer *buffer); 548 549 550 /* Misc helpers */ 551 552 char *vnc_socket_local_addr(const char *format, int fd); 553 char *vnc_socket_remote_addr(const char *format, int fd); 554 555 static inline uint32_t vnc_has_feature(VncState *vs, int feature) { 556 return (vs->features & (1 << feature)); 557 } 558 559 /* Framebuffer */ 560 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h, 561 int32_t encoding); 562 563 /* server fb is in PIXMAN_x8r8g8b8 */ 564 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8) 565 #define VNC_SERVER_FB_BITS (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT)) 566 #define VNC_SERVER_FB_BYTES ((VNC_SERVER_FB_BITS+7)/8) 567 568 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y); 569 int vnc_server_fb_stride(VncDisplay *vd); 570 571 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v); 572 double vnc_update_freq(VncState *vs, int x, int y, int w, int h); 573 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h); 574 575 /* Encodings */ 576 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 577 578 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 579 580 int vnc_hextile_send_framebuffer_update(VncState *vs, int x, 581 int y, int w, int h); 582 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic); 583 584 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size); 585 void vnc_zlib_zfree(void *x, void *addr); 586 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 587 void vnc_zlib_clear(VncState *vs); 588 589 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 590 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y, 591 int w, int h); 592 void vnc_tight_clear(VncState *vs); 593 594 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 595 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h); 596 void vnc_zrle_clear(VncState *vs); 597 598 #endif /* __QEMU_VNC_H */ 599