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/*
*
* This is an example of how to use libvncserver.
*
* libvncserver example
* Copyright (C) 2001 Johannes E. Schindelin <Johannes.Schindelin@gmx.de>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdio.h>
#include <netinet/in.h>
#ifdef __IRIX__
#include <netdb.h>
#endif
#define XK_MISCELLANY
#include "rfb.h"
#include "keysymdef.h"
const int maxx=640, maxy=480, bpp=4;
/* This initializes a nice (?) background */
void initBuffer(unsigned char* buffer)
{
int i,j;
for(i=0;i<maxx;++i)
for(j=0;j<maxy;++j) {
buffer[(j*maxx+i)*bpp+1]=(i+j)*256/(maxx+maxy); /* red */
buffer[(j*maxx+i)*bpp+2]=i*256/maxx; /* green */
buffer[(j*maxx+i)*bpp+3]=j*256/maxy; /* blue */
}
}
/* Here we create a structure so that every client has it's own pointer */
typedef struct ClientData {
Bool oldButton;
int oldx,oldy;
} ClientData;
void clientgone(rfbClientPtr cl)
{
free(cl->clientData);
}
void newclient(rfbClientPtr cl)
{
cl->clientData = (void*)calloc(sizeof(ClientData),1);
cl->clientGoneHook = clientgone;
}
/* aux function to draw a line */
void drawline(unsigned char* buffer,int rowstride,int bpp,int x1,int y1,int x2,int y2)
{
int i,j;
i=x1-x2; j=y1-y2;
if(i<0) i=-i;
if(j<0) j=-j;
if(i<j) {
if(y1>y2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
if(y2==y1) { if(y2>0) y1--; else y2++; }
for(j=y1;j<=y2;j++)
for(i=0;i<bpp;i++)
buffer[j*rowstride+(x1+(j-y1)*(x2-x1)/(y2-y1))*bpp+i]=0xff;
} else {
if(x1>x2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
for(i=x1;i<=x2;i++)
for(j=0;j<bpp;j++)
buffer[(y1+(i-x1)*(y2-y1)/(x2-x1))*rowstride+i*bpp+j]=0xff;
}
}
/* Here the pointer events are handled */
void doptr(int buttonMask,int x,int y,rfbClientPtr cl)
{
ClientData* cd=cl->clientData;
if(buttonMask && x>=0 && y>=0 && x<maxx && y<maxy) {
int i,j,x1,x2,y1,y2;
if(cd->oldButton==buttonMask) { /* draw a line */
drawline(cl->screen->frameBuffer,cl->screen->paddedWidthInBytes,bpp,
x,y,cd->oldx,cd->oldy);
rfbMarkRectAsModified(cl->screen,x,y,cd->oldx,cd->oldy);
} else { /* draw a point (diameter depends on button) */
x1=x-buttonMask; if(x1<0) x1=0;
x2=x+buttonMask; if(x2>maxx) x2=maxx;
y1=y-buttonMask; if(y1<0) y1=0;
y2=y+buttonMask; if(y2>maxy) y2=maxy;
for(i=x1*bpp;i<x2*bpp;i++)
for(j=y1;j<y2;j++)
cl->screen->frameBuffer[j*cl->screen->paddedWidthInBytes+i]=0xff;
rfbMarkRectAsModified(cl->screen,x1,y1,x2-1,y2-1);
}
/* we could get a selection like that:
rfbGotXCutText(cl->screen,"Hallo",5);
*/
cd->oldx=x; cd->oldy=y; cd->oldButton=buttonMask;
} else
cd->oldButton=0;
}
/* Here the key events are handled */
void dokey(Bool down,KeySym key,rfbClientPtr cl)
{
if(down && key==XK_Escape)
rfbCloseClient(cl);
else if(down && key=='c') {
initBuffer(cl->screen->frameBuffer);
rfbMarkRectAsModified(cl->screen,0,0,maxx,maxy);
}
}
/* Initialisation */
int main(int argc,char** argv)
{
rfbScreenInfoPtr rfbScreen =
rfbDefaultScreenInit(argc,argv,maxx,maxy,8,3,bpp);
rfbScreen->desktopName = "LibVNCServer Example";
rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
rfbScreen->rfbAlwaysShared = TRUE;
rfbScreen->ptrAddEvent = doptr;
rfbScreen->kbdAddEvent = dokey;
rfbScreen->newClientHook = newclient;
initBuffer(rfbScreen->frameBuffer);
/* this is the blocking event loop, i.e. it never returns */
/* 40000 are the microseconds, i.e. 0.04 seconds */
runEventLoop(rfbScreen,40000,FALSE);
/* this is the non-blocking event loop; a background thread is started */
runEventLoop(rfbScreen,40000,TRUE);
/* now we could do some cool things like rendering */
while(1);
return(0);
}
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