xref: /openbmc/qemu/ui/vnc.h (revision 520e210c)
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 "qapi/qapi-types-ui.h"
32 #include "qemu/queue.h"
33 #include "qemu/thread.h"
34 #include "ui/console.h"
35 #include "audio/audio.h"
36 #include "qemu/bitmap.h"
37 #include "crypto/tlssession.h"
38 #include "qemu/buffer.h"
39 #include "io/channel-socket.h"
40 #include "io/channel-tls.h"
41 #include "io/net-listener.h"
42 #include "authz/base.h"
43 #include <zlib.h>
44 
45 #include "keymaps.h"
46 #include "vnc-palette.h"
47 #include "vnc-enc-zrle.h"
48 #include "ui/kbd-state.h"
49 
50 // #define _VNC_DEBUG 1
51 
52 #ifdef _VNC_DEBUG
53 #define VNC_DEBUG(fmt, ...) do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
54 #else
55 #define VNC_DEBUG(fmt, ...) do { } while (0)
56 #endif
57 
58 /*****************************************************************************
59  *
60  * Core data structures
61  *
62  *****************************************************************************/
63 
64 typedef struct VncState VncState;
65 typedef struct VncJob VncJob;
66 typedef struct VncRect VncRect;
67 typedef struct VncRectEntry VncRectEntry;
68 
69 typedef int VncReadEvent(VncState *vs, uint8_t *data, size_t len);
70 
71 typedef void VncWritePixels(VncState *vs, void *data, int size);
72 
73 typedef void VncSendHextileTile(VncState *vs,
74                                 int x, int y, int w, int h,
75                                 void *last_bg,
76                                 void *last_fg,
77                                 int *has_bg, int *has_fg);
78 
79 /* VNC_DIRTY_PIXELS_PER_BIT is the number of dirty pixels represented
80  * by one bit in the dirty bitmap, should be a power of 2 */
81 #define VNC_DIRTY_PIXELS_PER_BIT 16
82 
83 /* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
84 
85 #define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
86 #define VNC_MAX_HEIGHT 2048
87 
88 /* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
89 #define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
90 
91 /* VNC_DIRTY_BPL (BPL = bits per line) might be greater than
92  * VNC_DIRTY_BITS due to alignment */
93 #define VNC_DIRTY_BPL(x) (sizeof((x)->dirty) / VNC_MAX_HEIGHT * BITS_PER_BYTE)
94 
95 #define VNC_STAT_RECT  64
96 #define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
97 #define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
98 
99 #define VNC_AUTH_CHALLENGE_SIZE 16
100 
101 typedef struct VncDisplay VncDisplay;
102 
103 #include "vnc-auth-vencrypt.h"
104 #ifdef CONFIG_VNC_SASL
105 #include "vnc-auth-sasl.h"
106 #endif
107 #include "vnc-ws.h"
108 
109 struct VncRectStat
110 {
111     /* time of last 10 updates, to find update frequency */
112     struct timeval times[10];
113     int idx;
114 
115     double freq;        /* Update frequency (in Hz) */
116     bool updated;       /* Already updated during this refresh */
117 };
118 
119 typedef struct VncRectStat VncRectStat;
120 
121 struct VncSurface
122 {
123     struct timeval last_freq_check;
124     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT],
125                    VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT);
126     VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
127     pixman_image_t *fb;
128     pixman_format_code_t format;
129 };
130 
131 typedef enum VncShareMode {
132     VNC_SHARE_MODE_CONNECTING = 1,
133     VNC_SHARE_MODE_SHARED,
134     VNC_SHARE_MODE_EXCLUSIVE,
135     VNC_SHARE_MODE_DISCONNECTED,
136 } VncShareMode;
137 
138 typedef enum VncSharePolicy {
139     VNC_SHARE_POLICY_IGNORE = 1,
140     VNC_SHARE_POLICY_ALLOW_EXCLUSIVE,
141     VNC_SHARE_POLICY_FORCE_SHARED,
142 } VncSharePolicy;
143 
144 struct VncDisplay
145 {
146     QTAILQ_HEAD(, VncState) clients;
147     int num_connecting;
148     int num_shared;
149     int num_exclusive;
150     int connections_limit;
151     VncSharePolicy share_policy;
152     QIONetListener *listener;
153     QIONetListener *wslistener;
154     DisplaySurface *ds;
155     DisplayChangeListener dcl;
156     kbd_layout_t *kbd_layout;
157     int lock_key_sync;
158     QEMUPutLEDEntry *led;
159     int ledstate;
160     QKbdState *kbd;
161     QemuMutex mutex;
162 
163     QEMUCursor *cursor;
164     int cursor_msize;
165     uint8_t *cursor_mask;
166 
167     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
168     pixman_image_t *server;    /* vnc server surface */
169 
170     const char *id;
171     QTAILQ_ENTRY(VncDisplay) next;
172     bool is_unix;
173     char *password;
174     time_t expires;
175     int auth;
176     int subauth; /* Used by VeNCrypt */
177     int ws_auth; /* Used by websockets */
178     int ws_subauth; /* Used by websockets */
179     bool lossy;
180     bool non_adaptive;
181     QCryptoTLSCreds *tlscreds;
182     QAuthZ *tlsauthz;
183     char *tlsauthzid;
184 #ifdef CONFIG_VNC_SASL
185     VncDisplaySASL sasl;
186 #endif
187 };
188 
189 typedef struct VncTight {
190     int type;
191     uint8_t quality;
192     uint8_t compression;
193     uint8_t pixel24;
194     Buffer tight;
195     Buffer tmp;
196     Buffer zlib;
197     Buffer gradient;
198 #ifdef CONFIG_VNC_JPEG
199     Buffer jpeg;
200 #endif
201 #ifdef CONFIG_VNC_PNG
202     Buffer png;
203 #endif
204     int levels[4];
205     z_stream stream[4];
206 } VncTight;
207 
208 typedef struct VncHextile {
209     VncSendHextileTile *send_tile;
210 } VncHextile;
211 
212 typedef struct VncZlib {
213     Buffer zlib;
214     Buffer tmp;
215     z_stream stream;
216     int level;
217 } VncZlib;
218 
219 typedef struct VncZrle {
220     int type;
221     Buffer fb;
222     Buffer zrle;
223     Buffer tmp;
224     Buffer zlib;
225     z_stream stream;
226     VncPalette palette;
227 } VncZrle;
228 
229 typedef struct VncZywrle {
230     int buf[VNC_ZRLE_TILE_WIDTH * VNC_ZRLE_TILE_HEIGHT];
231 } VncZywrle;
232 
233 struct VncRect
234 {
235     int x;
236     int y;
237     int w;
238     int h;
239 };
240 
241 struct VncRectEntry
242 {
243     struct VncRect rect;
244     QLIST_ENTRY(VncRectEntry) next;
245 };
246 
247 struct VncJob
248 {
249     VncState *vs;
250 
251     QLIST_HEAD(, VncRectEntry) rectangles;
252     QTAILQ_ENTRY(VncJob) next;
253 };
254 
255 typedef enum {
256     VNC_STATE_UPDATE_NONE,
257     VNC_STATE_UPDATE_INCREMENTAL,
258     VNC_STATE_UPDATE_FORCE,
259 } VncStateUpdate;
260 
261 #define VNC_MAGIC ((uint64_t)0x05b3f069b3d204bb)
262 
263 struct VncState
264 {
265     uint64_t magic;
266     QIOChannelSocket *sioc; /* The underlying socket */
267     QIOChannel *ioc; /* The channel currently used for I/O */
268     guint ioc_tag;
269     gboolean disconnecting;
270 
271     DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT], VNC_DIRTY_BITS);
272     uint8_t **lossy_rect; /* Not an Array to avoid costly memcpy in
273                            * vnc-jobs-async.c */
274 
275     VncDisplay *vd;
276     VncStateUpdate update; /* Most recent pending request from client */
277     VncStateUpdate job_update; /* Currently processed by job thread */
278     int has_dirty;
279     uint32_t features;
280     int absolute;
281     int last_x;
282     int last_y;
283     uint32_t last_bmask;
284     size_t client_width; /* limited to u16 by RFB proto */
285     size_t client_height; /* limited to u16 by RFB proto */
286     VncShareMode share_mode;
287 
288     uint32_t vnc_encoding;
289 
290     int major;
291     int minor;
292 
293     int auth;
294     int subauth; /* Used by VeNCrypt */
295     char challenge[VNC_AUTH_CHALLENGE_SIZE];
296     QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
297 #ifdef CONFIG_VNC_SASL
298     VncStateSASL sasl;
299 #endif
300     bool encode_ws;
301     bool websocket;
302 
303 #ifdef CONFIG_VNC
304     VncClientInfo *info;
305 #endif
306 
307     /* Job thread bottom half has put data for a forced update
308      * into the output buffer. This offset points to the end of
309      * the update data in the output buffer. This lets us determine
310      * when a force update is fully sent to the client, allowing
311      * us to process further forced updates. */
312     size_t force_update_offset;
313     /* We allow multiple incremental updates or audio capture
314      * samples to be queued in output buffer, provided the
315      * buffer size doesn't exceed this threshold. The value
316      * is calculating dynamically based on framebuffer size
317      * and audio sample settings in vnc_update_throttle_offset() */
318     size_t throttle_output_offset;
319     Buffer output;
320     Buffer input;
321     /* current output mode information */
322     VncWritePixels *write_pixels;
323     PixelFormat client_pf;
324     pixman_format_code_t client_format;
325     bool client_be;
326 
327     CaptureVoiceOut *audio_cap;
328     struct audsettings as;
329 
330     VncReadEvent *read_handler;
331     size_t read_handler_expect;
332 
333     bool abort;
334     QemuMutex output_mutex;
335     QEMUBH *bh;
336     Buffer jobs_buffer;
337 
338     /* Encoding specific, if you add something here, don't forget to
339      *  update vnc_async_encoding_start()
340      */
341     VncTight tight;
342     VncZlib zlib;
343     VncHextile hextile;
344     VncZrle zrle;
345     VncZywrle zywrle;
346 
347     Notifier mouse_mode_notifier;
348 
349     QTAILQ_ENTRY(VncState) next;
350 };
351 
352 
353 /*****************************************************************************
354  *
355  * Authentication modes
356  *
357  *****************************************************************************/
358 
359 enum {
360     VNC_AUTH_INVALID = 0,
361     VNC_AUTH_NONE = 1,
362     VNC_AUTH_VNC = 2,
363     VNC_AUTH_RA2 = 5,
364     VNC_AUTH_RA2NE = 6,
365     VNC_AUTH_TIGHT = 16,
366     VNC_AUTH_ULTRA = 17,
367     VNC_AUTH_TLS = 18,      /* Supported in GTK-VNC & VINO */
368     VNC_AUTH_VENCRYPT = 19, /* Supported in GTK-VNC & VeNCrypt */
369     VNC_AUTH_SASL = 20,     /* Supported in GTK-VNC & VINO */
370 };
371 
372 enum {
373     VNC_AUTH_VENCRYPT_PLAIN = 256,
374     VNC_AUTH_VENCRYPT_TLSNONE = 257,
375     VNC_AUTH_VENCRYPT_TLSVNC = 258,
376     VNC_AUTH_VENCRYPT_TLSPLAIN = 259,
377     VNC_AUTH_VENCRYPT_X509NONE = 260,
378     VNC_AUTH_VENCRYPT_X509VNC = 261,
379     VNC_AUTH_VENCRYPT_X509PLAIN = 262,
380     VNC_AUTH_VENCRYPT_X509SASL = 263,
381     VNC_AUTH_VENCRYPT_TLSSASL = 264,
382 };
383 
384 
385 /*****************************************************************************
386  *
387  * Encoding types
388  *
389  *****************************************************************************/
390 
391 #define VNC_ENCODING_RAW                  0x00000000
392 #define VNC_ENCODING_COPYRECT             0x00000001
393 #define VNC_ENCODING_RRE                  0x00000002
394 #define VNC_ENCODING_CORRE                0x00000004
395 #define VNC_ENCODING_HEXTILE              0x00000005
396 #define VNC_ENCODING_ZLIB                 0x00000006
397 #define VNC_ENCODING_TIGHT                0x00000007
398 #define VNC_ENCODING_ZLIBHEX              0x00000008
399 #define VNC_ENCODING_TRLE                 0x0000000f
400 #define VNC_ENCODING_ZRLE                 0x00000010
401 #define VNC_ENCODING_ZYWRLE               0x00000011
402 #define VNC_ENCODING_COMPRESSLEVEL0       0xFFFFFF00 /* -256 */
403 #define VNC_ENCODING_QUALITYLEVEL0        0xFFFFFFE0 /* -32  */
404 #define VNC_ENCODING_XCURSOR              0xFFFFFF10 /* -240 */
405 #define VNC_ENCODING_RICH_CURSOR          0xFFFFFF11 /* -239 */
406 #define VNC_ENCODING_POINTER_POS          0xFFFFFF18 /* -232 */
407 #define VNC_ENCODING_LASTRECT             0xFFFFFF20 /* -224 */
408 #define VNC_ENCODING_DESKTOPRESIZE        0xFFFFFF21 /* -223 */
409 #define VNC_ENCODING_POINTER_TYPE_CHANGE  0XFFFFFEFF /* -257 */
410 #define VNC_ENCODING_EXT_KEY_EVENT        0XFFFFFEFE /* -258 */
411 #define VNC_ENCODING_AUDIO                0XFFFFFEFD /* -259 */
412 #define VNC_ENCODING_TIGHT_PNG            0xFFFFFEFC /* -260 */
413 #define VNC_ENCODING_LED_STATE            0XFFFFFEFB /* -261 */
414 #define VNC_ENCODING_WMVi                 0x574D5669
415 
416 /*****************************************************************************
417  *
418  * Other tight constants
419  *
420  *****************************************************************************/
421 
422 /*
423  * Vendors known by TightVNC: standard VNC/RealVNC, TridiaVNC, and TightVNC.
424  */
425 
426 #define VNC_TIGHT_CCB_RESET_MASK   (0x0f)
427 #define VNC_TIGHT_CCB_TYPE_MASK    (0x0f << 4)
428 #define VNC_TIGHT_CCB_TYPE_FILL    (0x08 << 4)
429 #define VNC_TIGHT_CCB_TYPE_JPEG    (0x09 << 4)
430 #define VNC_TIGHT_CCB_TYPE_PNG     (0x0A << 4)
431 #define VNC_TIGHT_CCB_BASIC_MAX    (0x07 << 4)
432 #define VNC_TIGHT_CCB_BASIC_ZLIB   (0x03 << 4)
433 #define VNC_TIGHT_CCB_BASIC_FILTER (0x04 << 4)
434 
435 /*****************************************************************************
436  *
437  * Features
438  *
439  *****************************************************************************/
440 
441 #define VNC_FEATURE_RESIZE                   0
442 #define VNC_FEATURE_HEXTILE                  1
443 #define VNC_FEATURE_POINTER_TYPE_CHANGE      2
444 #define VNC_FEATURE_WMVI                     3
445 #define VNC_FEATURE_TIGHT                    4
446 #define VNC_FEATURE_ZLIB                     5
447 #define VNC_FEATURE_COPYRECT                 6
448 #define VNC_FEATURE_RICH_CURSOR              7
449 #define VNC_FEATURE_TIGHT_PNG                8
450 #define VNC_FEATURE_ZRLE                     9
451 #define VNC_FEATURE_ZYWRLE                  10
452 #define VNC_FEATURE_LED_STATE               11
453 
454 #define VNC_FEATURE_RESIZE_MASK              (1 << VNC_FEATURE_RESIZE)
455 #define VNC_FEATURE_HEXTILE_MASK             (1 << VNC_FEATURE_HEXTILE)
456 #define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
457 #define VNC_FEATURE_WMVI_MASK                (1 << VNC_FEATURE_WMVI)
458 #define VNC_FEATURE_TIGHT_MASK               (1 << VNC_FEATURE_TIGHT)
459 #define VNC_FEATURE_ZLIB_MASK                (1 << VNC_FEATURE_ZLIB)
460 #define VNC_FEATURE_COPYRECT_MASK            (1 << VNC_FEATURE_COPYRECT)
461 #define VNC_FEATURE_RICH_CURSOR_MASK         (1 << VNC_FEATURE_RICH_CURSOR)
462 #define VNC_FEATURE_TIGHT_PNG_MASK           (1 << VNC_FEATURE_TIGHT_PNG)
463 #define VNC_FEATURE_ZRLE_MASK                (1 << VNC_FEATURE_ZRLE)
464 #define VNC_FEATURE_ZYWRLE_MASK              (1 << VNC_FEATURE_ZYWRLE)
465 #define VNC_FEATURE_LED_STATE_MASK           (1 << VNC_FEATURE_LED_STATE)
466 
467 
468 /* Client -> Server message IDs */
469 #define VNC_MSG_CLIENT_SET_PIXEL_FORMAT           0
470 #define VNC_MSG_CLIENT_SET_ENCODINGS              2
471 #define VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST 3
472 #define VNC_MSG_CLIENT_KEY_EVENT                  4
473 #define VNC_MSG_CLIENT_POINTER_EVENT              5
474 #define VNC_MSG_CLIENT_CUT_TEXT                   6
475 #define VNC_MSG_CLIENT_VMWARE_0                   127
476 #define VNC_MSG_CLIENT_CALL_CONTROL               249
477 #define VNC_MSG_CLIENT_XVP                        250
478 #define VNC_MSG_CLIENT_SET_DESKTOP_SIZE           251
479 #define VNC_MSG_CLIENT_TIGHT                      252
480 #define VNC_MSG_CLIENT_GII                        253
481 #define VNC_MSG_CLIENT_VMWARE_1                   254
482 #define VNC_MSG_CLIENT_QEMU                       255
483 
484 /* Server -> Client message IDs */
485 #define VNC_MSG_SERVER_FRAMEBUFFER_UPDATE         0
486 #define VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES     1
487 #define VNC_MSG_SERVER_BELL                       2
488 #define VNC_MSG_SERVER_CUT_TEXT                   3
489 #define VNC_MSG_SERVER_VMWARE_0                   127
490 #define VNC_MSG_SERVER_CALL_CONTROL               249
491 #define VNC_MSG_SERVER_XVP                        250
492 #define VNC_MSG_SERVER_TIGHT                      252
493 #define VNC_MSG_SERVER_GII                        253
494 #define VNC_MSG_SERVER_VMWARE_1                   254
495 #define VNC_MSG_SERVER_QEMU                       255
496 
497 
498 
499 /* QEMU client -> server message IDs */
500 #define VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT         0
501 #define VNC_MSG_CLIENT_QEMU_AUDIO                 1
502 
503 /* QEMU server -> client message IDs */
504 #define VNC_MSG_SERVER_QEMU_AUDIO                 1
505 
506 
507 
508 /* QEMU client -> server audio message IDs */
509 #define VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE          0
510 #define VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE         1
511 #define VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT      2
512 
513 /* QEMU server -> client audio message IDs */
514 #define VNC_MSG_SERVER_QEMU_AUDIO_END             0
515 #define VNC_MSG_SERVER_QEMU_AUDIO_BEGIN           1
516 #define VNC_MSG_SERVER_QEMU_AUDIO_DATA            2
517 
518 
519 /*****************************************************************************
520  *
521  * Internal APIs
522  *
523  *****************************************************************************/
524 
525 /* Event loop functions */
526 gboolean vnc_client_io(QIOChannel *ioc,
527                        GIOCondition condition,
528                        void *opaque);
529 
530 size_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
531 size_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
532 
533 /* Protocol I/O functions */
534 void vnc_write(VncState *vs, const void *data, size_t len);
535 void vnc_write_u32(VncState *vs, uint32_t value);
536 void vnc_write_s32(VncState *vs, int32_t value);
537 void vnc_write_u16(VncState *vs, uint16_t value);
538 void vnc_write_u8(VncState *vs, uint8_t value);
539 void vnc_flush(VncState *vs);
540 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
541 void vnc_disconnect_finish(VncState *vs);
542 void vnc_start_protocol(VncState *vs);
543 
544 
545 /* Buffer I/O functions */
546 uint32_t read_u32(uint8_t *data, size_t offset);
547 
548 /* Protocol stage functions */
549 void vnc_client_error(VncState *vs);
550 size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error **errp);
551 
552 void start_client_init(VncState *vs);
553 void start_auth_vnc(VncState *vs);
554 
555 
556 /* Misc helpers */
557 
558 static inline uint32_t vnc_has_feature(VncState *vs, int feature) {
559     return (vs->features & (1 << feature));
560 }
561 
562 /* Framebuffer */
563 void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
564                             int32_t encoding);
565 
566 /* server fb is in PIXMAN_x8r8g8b8 */
567 #define VNC_SERVER_FB_FORMAT PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
568 #define VNC_SERVER_FB_BITS   (PIXMAN_FORMAT_BPP(VNC_SERVER_FB_FORMAT))
569 #define VNC_SERVER_FB_BYTES  ((VNC_SERVER_FB_BITS+7)/8)
570 
571 void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y);
572 int vnc_server_fb_stride(VncDisplay *vd);
573 
574 void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
575 double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
576 void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h);
577 
578 /* Encodings */
579 int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
580 
581 int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
582 
583 int vnc_hextile_send_framebuffer_update(VncState *vs, int x,
584                                          int y, int w, int h);
585 void vnc_hextile_set_pixel_conversion(VncState *vs, int generic);
586 
587 void *vnc_zlib_zalloc(void *x, unsigned items, unsigned size);
588 void vnc_zlib_zfree(void *x, void *addr);
589 int vnc_zlib_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
590 void vnc_zlib_clear(VncState *vs);
591 
592 int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
593 int vnc_tight_png_send_framebuffer_update(VncState *vs, int x, int y,
594                                           int w, int h);
595 void vnc_tight_clear(VncState *vs);
596 
597 int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
598 int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);
599 void vnc_zrle_clear(VncState *vs);
600 
601 #endif /* QEMU_VNC_H */
602