int init_x (int X, int Y,
int W, int H, int bpp,
const char *Name) {
XPixmapFormatValues *formatList;
int formatCount;
int i;
int formatOk;
int scanlineLength;
XGCValues gcVal;
unsigned long gcMask;
dis = XOpenDisplay ( NULL );
if ( dis == NULL) {
fprintf ( stderr , "Error :\n" );
fprintf ( stderr , " Cannot connect to Display.\n");
exit (1);
}
screen = DefaultScreen ( dis );
depth = DefaultDepth ( dis , screen );
width = DisplayWidth ( dis , screen );
height = DisplayHeight ( dis , screen );
winRoot = DefaultRootWindow ( dis );
winAttr.border_pixel = BlackPixel ( dis , screen );
winAttr.background_pixel = BlackPixel ( dis , screen );
winMask = CWBackPixel | CWBorderPixel;
formatList = XListPixmapFormats( dis, &formatCount);
if (formatList == NULL){
fprintf ( stderr , " Cannot get pixmap list\n");
exit (1);
}
formatOk=-1;
for (i=0; ibytes_per_line*xim->height,
IPC_CREAT|0777);
xim->data = SHMInfo.shmaddr = (char *)shmat(SHMInfo.shmid, 0, 0);
SHMInfo.readOnly = False;
XShmAttach(dis, &SHMInfo);
XSync(dis, False);
buffer=(unsigned char *)xim->data;
#else
buffer = (unsigned char *)calloc(W*H, pixmapFormat.bits_per_pixel/8);
xim = XCreateImage ( dis , CopyFromParent , depth , ZPixmap , 0 ,
(char *) buffer , W , H ,
pixmapFormat.scanline_pad, scanlineLength);
if (xim == NULL){
fprintf(stderr, " Couldnt create Ximage..\n");
exit(-1);
}
#endif
gcVal.foreground = 0;
gcVal.background = 0;
gcMask = GCForeground | GCBackground;
gc = XCreateGC ( dis , win , gcMask , &gcVal );
if (depth==24)
depth = pixmapFormat.bits_per_pixel;
return (depth);
}
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