LibVNCServer/LibVNCClient
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example.c
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1 
24 #ifdef WIN32
25 #define sleep Sleep
26 #else
27 #include <unistd.h>
28 #endif
29 
30 #ifdef __IRIX__
31 #include <netdb.h>
32 #endif
33 
34 #include <rfb/rfb.h>
35 #include <rfb/keysym.h>
36 
37 static const int bpp=4;
38 static int maxx=800, maxy=600;
39 /* TODO: odd maxx doesn't work (vncviewer bug) */
40 
41 /* This initializes a nice (?) background */
42 
43 static void initBuffer(unsigned char* buffer)
44 {
45  int i,j;
46  for(j=0;j<maxy;++j) {
47  for(i=0;i<maxx;++i) {
48  buffer[(j*maxx+i)*bpp+0]=(i+j)*128/(maxx+maxy); /* red */
49  buffer[(j*maxx+i)*bpp+1]=i*128/maxx; /* green */
50  buffer[(j*maxx+i)*bpp+2]=j*256/maxy; /* blue */
51  }
52  buffer[j*maxx*bpp+0]=0xff;
53  buffer[j*maxx*bpp+1]=0xff;
54  buffer[j*maxx*bpp+2]=0xff;
55  buffer[j*maxx*bpp+3]=0xff;
56  }
57 }
58 
59 /* Here we create a structure so that every client has it's own pointer */
60 
61 typedef struct ClientData {
63  int oldx,oldy;
64 } ClientData;
65 
66 static void clientgone(rfbClientPtr cl)
67 {
68  free(cl->clientData);
69 }
70 
71 static enum rfbNewClientAction newclient(rfbClientPtr cl)
72 {
73  cl->clientData = (void*)calloc(sizeof(ClientData),1);
74  cl->clientGoneHook = clientgone;
75  return RFB_CLIENT_ACCEPT;
76 }
77 
78 /* switch to new framebuffer contents */
79 
80 static void newframebuffer(rfbScreenInfoPtr screen, int width, int height)
81 {
82  unsigned char *oldfb, *newfb;
83 
84  maxx = width;
85  maxy = height;
86  oldfb = (unsigned char*)screen->frameBuffer;
87  newfb = (unsigned char*)malloc(maxx * maxy * bpp);
88  initBuffer(newfb);
89  rfbNewFramebuffer(screen, (char*)newfb, maxx, maxy, 8, 3, bpp);
90  free(oldfb);
91 
92  /*** FIXME: Re-install cursor. ***/
93 }
94 
95 /* aux function to draw a line */
96 
97 static void drawline(unsigned char* buffer,int rowstride,int bpp,int x1,int y1,int x2,int y2)
98 {
99  int i,j;
100  i=x1-x2; j=y1-y2;
101  if(i==0 && j==0) {
102  for(i=0;i<bpp;i++)
103  buffer[y1*rowstride+x1*bpp+i]=0xff;
104  return;
105  }
106  if(i<0) i=-i;
107  if(j<0) j=-j;
108  if(i<j) {
109  if(y1>y2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
110  for(j=y1;j<=y2;j++)
111  for(i=0;i<bpp;i++)
112  buffer[j*rowstride+(x1+(j-y1)*(x2-x1)/(y2-y1))*bpp+i]=0xff;
113  } else {
114  if(x1>x2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
115  for(i=x1;i<=x2;i++)
116  for(j=0;j<bpp;j++)
117  buffer[(y1+(i-x1)*(y2-y1)/(x2-x1))*rowstride+i*bpp+j]=0xff;
118  }
119 }
120 
121 /* Here the pointer events are handled */
122 
123 static void doptr(int buttonMask,int x,int y,rfbClientPtr cl)
124 {
125  ClientData* cd=cl->clientData;
126 
127  if(x>=0 && y>=0 && x<maxx && y<maxy) {
128  if(buttonMask) {
129  int i,j,x1,x2,y1,y2;
130 
131  if(cd->oldButton==buttonMask) { /* draw a line */
132  drawline((unsigned char*)cl->screen->frameBuffer,cl->screen->paddedWidthInBytes,bpp,
133  x,y,cd->oldx,cd->oldy);
134  x1=x; y1=y;
135  if(x1>cd->oldx) x1++; else cd->oldx++;
136  if(y1>cd->oldy) y1++; else cd->oldy++;
137  rfbMarkRectAsModified(cl->screen,x,y,cd->oldx,cd->oldy);
138  } else { /* draw a point (diameter depends on button) */
139  int w=cl->screen->paddedWidthInBytes;
140  x1=x-buttonMask; if(x1<0) x1=0;
141  x2=x+buttonMask; if(x2>maxx) x2=maxx;
142  y1=y-buttonMask; if(y1<0) y1=0;
143  y2=y+buttonMask; if(y2>maxy) y2=maxy;
144 
145  for(i=x1*bpp;i<x2*bpp;i++)
146  for(j=y1;j<y2;j++)
147  cl->screen->frameBuffer[j*w+i]=(char)0xff;
148  rfbMarkRectAsModified(cl->screen,x1,y1,x2,y2);
149  }
150 
151  /* we could get a selection like that:
152  rfbGotXCutText(cl->screen,"Hallo",5);
153  */
154  } else
155  cd->oldButton=0;
156 
157  cd->oldx=x; cd->oldy=y; cd->oldButton=buttonMask;
158  }
159  rfbDefaultPtrAddEvent(buttonMask,x,y,cl);
160 }
161 
162 /* aux function to draw a character to x, y */
163 
164 #include "radon.h"
165 
166 /* Here the key events are handled */
167 
168 static void dokey(rfbBool down,rfbKeySym key,rfbClientPtr cl)
169 {
170  if(down) {
171  if(key==XK_Escape)
172  rfbCloseClient(cl);
173  else if(key==XK_F12)
174  /* close down server, disconnecting clients */
175  rfbShutdownServer(cl->screen,TRUE);
176  else if(key==XK_F11)
177  /* close down server, but wait for all clients to disconnect */
178  rfbShutdownServer(cl->screen,FALSE);
179  else if(key==XK_Page_Up) {
180  initBuffer((unsigned char*)cl->screen->frameBuffer);
181  rfbMarkRectAsModified(cl->screen,0,0,maxx,maxy);
182  } else if (key == XK_Up) {
183  if (maxx < 1024) {
184  if (maxx < 800) {
185  newframebuffer(cl->screen, 800, 600);
186  } else {
187  newframebuffer(cl->screen, 1024, 768);
188  }
189  }
190  } else if(key==XK_Down) {
191  if (maxx > 640) {
192  if (maxx > 800) {
193  newframebuffer(cl->screen, 800, 600);
194  } else {
195  newframebuffer(cl->screen, 640, 480);
196  }
197  }
198  } else if(key>=' ' && key<0x100) {
199  ClientData* cd=cl->clientData;
200  int x1=cd->oldx,y1=cd->oldy,x2,y2;
201  cd->oldx+=rfbDrawCharWithClip(cl->screen,&radonFont,cd->oldx,cd->oldy,(char)key,0,0,cl->screen->width,cl->screen->height,0x00ffffff,0x00ffffff);
202  rfbFontBBox(&radonFont,(char)key,&x1,&y1,&x2,&y2);
203  rfbMarkRectAsModified(cl->screen,x1,y1,x2-1,y2-1);
204  }
205  }
206 }
207 
208 /* Example for an XCursor (foreground/background only) */
209 
210 #ifdef JUST_AN_EXAMPLE
211 
212 static int exampleXCursorWidth=9,exampleXCursorHeight=7;
213 static char exampleXCursor[]=
214  " "
215  " xx xx "
216  " xx xx "
217  " xxx "
218  " xx xx "
219  " xx xx "
220  " ";
221 
222 #endif
223 
224 /* Example for a rich cursor (full-colour) */
225 
226 static void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
227 {
228  int i,j,w=32,h=32;
229  rfbCursorPtr c = rfbScreen->cursor;
230  char bitmap[]=
231  " "
232  " xxxxxx "
233  " xxxxxxxxxxxxxxxxx "
234  " xxxxxxxxxxxxxxxxxxxxxx "
235  " xxxxx xxxxxxxx xxxxxxxx "
236  " xxxxxxxxxxxxxxxxxxxxxxxxxxx "
237  " xxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
238  " xxxxx xxxxxxxxxxx xxxxxxx "
239  " xxxx xxxxxxxxx xxxxxx "
240  " xxxxx xxxxxxxxxxx xxxxxxx "
241  " xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
242  " xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
243  " xxxxxxxxxxxx xxxxxxxxxxxxxxx "
244  " xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
245  " xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
246  " xxxxxxxxxxx xxxxxxxxxxxxxx "
247  " xxxxxxxxxx xxxxxxxxxxxx "
248  " xxxxxxxxx xxxxxxxxx "
249  " xxxxxxxxxx xxxxxxxxx "
250  " xxxxxxxxxxxxxxxxxxx "
251  " xxxxxxxxxxxxxxxxxxx "
252  " xxxxxxxxxxxxxxxxxxx "
253  " xxxxxxxxxxxxxxxxx "
254  " xxxxxxxxxxxxxxx "
255  " xxxx xxxxxxxxxxxxx "
256  " xx x xxxxxxxxxxx "
257  " xxx xxxxxxxxxxx "
258  " xxxx xxxxxxxxxxx "
259  " xxxxxx xxxxxxxxxxxx "
260  " xxxxxxxxxxxxxxxxxxxxxx "
261  " xxxxxxxxxxxxxxxx "
262  " ";
263  c=rfbScreen->cursor = rfbMakeXCursor(w,h,bitmap,bitmap);
264  c->xhot = 16; c->yhot = 24;
265 
266  c->richSource = (unsigned char*)malloc(w*h*bpp);
267  c->cleanupRichSource = TRUE;
268  for(j=0;j<h;j++) {
269  for(i=0;i<w;i++) {
270  c->richSource[j*w*bpp+i*bpp+0]=i*0xff/w;
271  c->richSource[j*w*bpp+i*bpp+1]=(i+j)*0xff/(w+h);
272  c->richSource[j*w*bpp+i*bpp+2]=j*0xff/h;
273  c->richSource[j*w*bpp+i*bpp+3]=0;
274  }
275  }
276 }
277 
278 /* Initialization */
279 
280 int main(int argc,char** argv)
281 {
282  rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
283  if(!rfbScreen)
284  return 0;
285  rfbScreen->desktopName = "LibVNCServer Example";
286  rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
287  rfbScreen->alwaysShared = TRUE;
288  rfbScreen->ptrAddEvent = doptr;
289  rfbScreen->kbdAddEvent = dokey;
290  rfbScreen->newClientHook = newclient;
291  rfbScreen->httpDir = "../webclients";
292  rfbScreen->httpEnableProxyConnect = TRUE;
293 
294  initBuffer((unsigned char*)rfbScreen->frameBuffer);
295  rfbDrawString(rfbScreen,&radonFont,20,100,"Hello, World!",0xffffff);
296 
297  /* This call creates a mask and then a cursor: */
298  /* rfbScreen->defaultCursor =
299  rfbMakeXCursor(exampleCursorWidth,exampleCursorHeight,exampleCursor,0);
300  */
301 
302  MakeRichCursor(rfbScreen);
303 
304  /* initialize the server */
305  rfbInitServer(rfbScreen);
306 
307 #ifndef BACKGROUND_LOOP_TEST
308 #ifdef USE_OWN_LOOP
309  {
310  int i;
311  for(i=0;rfbIsActive(rfbScreen);i++) {
312  fprintf(stderr,"%d\r",i);
313  rfbProcessEvents(rfbScreen,100000);
314  }
315  }
316 #else
317  /* this is the blocking event loop, i.e. it never returns */
318  /* 40000 are the microseconds to wait on select(), i.e. 0.04 seconds */
319  rfbRunEventLoop(rfbScreen,40000,FALSE);
320 #endif /* OWN LOOP */
321 #else
322 #if !defined(LIBVNCSERVER_HAVE_LIBPTHREAD)
323 #error "I need pthreads for that."
324 #endif
325 
326  /* this is the non-blocking event loop; a background thread is started */
327  rfbRunEventLoop(rfbScreen,-1,TRUE);
328  fprintf(stderr, "Running background loop...\n");
329  /* now we could do some cool things like rendering in idle time */
330  while(1) sleep(5); /* render(); */
331 #endif /* BACKGROUND_LOOP */
332 
333  free(rfbScreen->frameBuffer);
334  rfbScreenCleanup(rfbScreen);
335 
336  return(0);
337 }