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