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#include <Xw_Extension.h>
/* ifdef then trace on */
#ifdef TRACE
#define TRACE_SET_DOUBLE_BUFFER
#endif
/*
XW_STATUS Xw_set_double_buffer (awindow, state)
XW_EXT_WINDOW *awindow
DOUBLEBUFFERMODE state ;
Sets the double_buffering status of the window .
returns ERROR if Double Buffering is not XW_ENABLE on this station
returns XW_SUCCESS if successful
*/
static char SetDoubleBuffer = '\0' ;
#ifdef XW_PROTOTYPE
XW_STATUS Xw_set_double_buffer (void *awindow, XW_DOUBLEBUFFERMODE state)
#else
XW_STATUS Xw_set_double_buffer (awindow, state)
void *awindow;
XW_DOUBLEBUFFERMODE state ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_WINDOW *pwindow = (XW_EXT_WINDOW*)awindow;
XW_STATUS status = XW_SUCCESS;
char svalue[4] ;
if( !Xw_isdefine_window(pwindow) ) {
/*ERROR*Bad EXT_WINDOW Address*/
Xw_set_error(24,"Xw_set_double_buffer",pwindow) ;
return (XW_ERROR) ;
}
if( SetDoubleBuffer == '\0' ) {
SetDoubleBuffer = 'U' ;
if( Xw_get_env("Xw_SET_DOUBLE_BUFFER",svalue,sizeof(svalue)) ) {
if( strlen(svalue) ) {
SetDoubleBuffer = svalue[0] ;
}
printf(" Xw_SET_DOUBLE_BUFFER is '%c'\n",SetDoubleBuffer) ;
}
}
if( (SetDoubleBuffer == 'Y') ) {
state = XW_ENABLE ;
} else if( SetDoubleBuffer == 'N' ) {
state = XW_DISABLE ;
}
if( state == XW_DISABLE ) {
if( _NWBUFFER > 0 ) {
if( _DRAWABLE == _FWBUFFER ) return (XW_SUCCESS);
_DRAWABLE = _FWBUFFER ;
} else {
if( _DRAWABLE == _WINDOW ) return (XW_SUCCESS);
_DRAWABLE = _WINDOW ;
}
} else if( state == XW_ENABLE ) {
if( !_PIXMAP && !_NWBUFFER ) {
status = Xw_open_pixmap(awindow) ;
}
if( _NWBUFFER > 0 ) {
_DRAWABLE = _BWBUFFER ;
} else if( _PIXMAP ) {
_DRAWABLE = _PIXMAP ;
} else {
_DRAWABLE = _WINDOW ;
}
}
#ifdef TRACE_SET_DOUBLE_BUFFER
if( Xw_get_trace() ) {
printf(" Xw_set_double_buffer(%lx,%d)\n",(long ) pwindow,state) ;
}
#endif
return (status);
}
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