xref: /openbmc/qemu/ui/vnc.h (revision bc5c4f21)
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     QEMUPutLEDEntry *led;
158     int ledstate;
159     int key_delay_ms;
160     QemuMutex mutex;
161 
162     QEMUCursor *cursor;
163     int cursor_msize;
164     uint8_t *cursor_mask;
165 
166     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
167     pixman_image_t *server;    /* vnc server surface */
168 
169     const char *id;
170     QTAILQ_ENTRY(VncDisplay) next;
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     int ws_subauth; /* 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 
310     bool abort;
311     QemuMutex output_mutex;
312     QEMUBH *bh;
313     Buffer jobs_buffer;
314 
315     /* Encoding specific, if you add something here, don't forget to
316      *  update vnc_async_encoding_start()
317      */
318     VncTight tight;
319     VncZlib zlib;
320     VncHextile hextile;
321     VncZrle zrle;
322     VncZywrle zywrle;
323 
324     Notifier mouse_mode_notifier;
325 
326     QTAILQ_ENTRY(VncState) next;
327 };
328 
329 
330 /*****************************************************************************
331  *
332  * Authentication modes
333  *
334  *****************************************************************************/
335 
336 enum {
337     VNC_AUTH_INVALID = 0,
338     VNC_AUTH_NONE = 1,
339     VNC_AUTH_VNC = 2,
340     VNC_AUTH_RA2 = 5,
341     VNC_AUTH_RA2NE = 6,
342     VNC_AUTH_TIGHT = 16,
343     VNC_AUTH_ULTRA = 17,
344     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
345     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
346     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
347 };
348 
349 enum {
350     VNC_AUTH_VENCRYPT_PLAIN = 256,
351     VNC_AUTH_VENCRYPT_TLSNONE = 257,
352     VNC_AUTH_VENCRYPT_TLSVNC = 258,
353     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
354     VNC_AUTH_VENCRYPT_X509NONE = 260,
355     VNC_AUTH_VENCRYPT_X509VNC = 261,
356     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
357     VNC_AUTH_VENCRYPT_X509SASL = 263,
358     VNC_AUTH_VENCRYPT_TLSSASL = 264,
359 };
360 
361 
362 /*****************************************************************************
363  *
364  * Encoding types
365  *
366  *****************************************************************************/
367 
368 #define VNC_ENCODING_RAW                  0x00000000
369 #define VNC_ENCODING_COPYRECT             0x00000001
370 #define VNC_ENCODING_RRE                  0x00000002
371 #define VNC_ENCODING_CORRE                0x00000004
372 #define VNC_ENCODING_HEXTILE              0x00000005
373 #define VNC_ENCODING_ZLIB                 0x00000006
374 #define VNC_ENCODING_TIGHT                0x00000007
375 #define VNC_ENCODING_ZLIBHEX              0x00000008
376 #define VNC_ENCODING_TRLE                 0x0000000f
377 #define VNC_ENCODING_ZRLE                 0x00000010
378 #define VNC_ENCODING_ZYWRLE               0x00000011
379 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
380 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
381 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
382 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
383 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
384 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
385 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
386 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
387 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
388 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
389 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
390 #define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
391 #define VNC_ENCODING_WMVi                 0x574D5669
392 
393 /*****************************************************************************
394  *
395  * Other tight constants
396  *
397  *****************************************************************************/
398 
399 /*
400  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
401  */
402 
403 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
404 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
405 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
406 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
407 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
408 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
409 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
410 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
411 
412 /*****************************************************************************
413  *
414  * Features
415  *
416  *****************************************************************************/
417 
418 #define VNC_FEATURE_RESIZE                   0
419 #define VNC_FEATURE_HEXTILE                  1
420 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
421 #define VNC_FEATURE_WMVI                     3
422 #define VNC_FEATURE_TIGHT                    4
423 #define VNC_FEATURE_ZLIB                     5
424 #define VNC_FEATURE_COPYRECT                 6
425 #define VNC_FEATURE_RICH_CURSOR              7
426 #define VNC_FEATURE_TIGHT_PNG                8
427 #define VNC_FEATURE_ZRLE                     9
428 #define VNC_FEATURE_ZYWRLE                  10
429 #define VNC_FEATURE_LED_STATE               11
430 
431 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
432 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
433 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
434 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
435 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
436 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
437 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
438 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
439 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
440 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
441 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
442 #define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
443 
444 
445 /* Client -> Server message IDs */
446 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
447 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
448 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
449 #define VNC_MSG_CLIENT_KEY_EVENT                  4
450 #define VNC_MSG_CLIENT_POINTER_EVENT              5
451 #define VNC_MSG_CLIENT_CUT_TEXT                   6
452 #define VNC_MSG_CLIENT_VMWARE_0                   127
453 #define VNC_MSG_CLIENT_CALL_CONTROL               249
454 #define VNC_MSG_CLIENT_XVP                        250
455 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
456 #define VNC_MSG_CLIENT_TIGHT                      252
457 #define VNC_MSG_CLIENT_GII                        253
458 #define VNC_MSG_CLIENT_VMWARE_1                   254
459 #define VNC_MSG_CLIENT_QEMU                       255
460 
461 /* Server -> Client message IDs */
462 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
463 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
464 #define VNC_MSG_SERVER_BELL                       2
465 #define VNC_MSG_SERVER_CUT_TEXT                   3
466 #define VNC_MSG_SERVER_VMWARE_0                   127
467 #define VNC_MSG_SERVER_CALL_CONTROL               249
468 #define VNC_MSG_SERVER_XVP                        250
469 #define VNC_MSG_SERVER_TIGHT                      252
470 #define VNC_MSG_SERVER_GII                        253
471 #define VNC_MSG_SERVER_VMWARE_1                   254
472 #define VNC_MSG_SERVER_QEMU                       255
473 
474 
475 
476 /* QEMU client -> server message IDs */
477 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
478 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
479 
480 /* QEMU server -> client message IDs */
481 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
482 
483 
484 
485 /* QEMU client -> server audio message IDs */
486 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
487 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
488 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
489 
490 /* QEMU server -> client audio message IDs */
491 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
492 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
493 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
494 
495 
496 /*****************************************************************************
497  *
498  * Internal APIs
499  *
500  *****************************************************************************/
501 
502 /* Event loop functions */
503 gboolean vnc_client_io(QIOChannel *ioc,
504                        GIOCondition condition,
505                        void *opaque);
506 
507 ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
508 ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
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_start_protocol(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, Error **errp);
528 
529 void start_client_init(VncState *vs);
530 void start_auth_vnc(VncState *vs);
531 
532 
533 /* Misc helpers */
534 
535 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
536     return (vs->features & (1 << feature));
537 }
538 
539 /* Framebuffer */
540 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
541                             int32_t encoding);
542 
543 /* server fb is in PIXMAN_x8r8g8b8 */
544 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
545 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
546 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
547 
548 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
549 int vnc_server_fb_stride(VncDisplay *vd);
550 
551 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
552 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
553 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
554 
555 /* Encodings */
556 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
557 
558 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
559 
560 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
561                                          int y, int w, int h);
562 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
563 
564 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
565 void vnc_zlib_zfree(void *x, void *addr);
566 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
567 void vnc_zlib_clear(VncState *vs);
568 
569 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
570 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
571                                           int w, int h);
572 void vnc_tight_clear(VncState *vs);
573 
574 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
575 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
576 void vnc_zrle_clear(VncState *vs);
577 
578 #endif /* QEMU_VNC_H */
579