/* 
 * This Software is the original work of Daniel TUNG 
 * This Software is submitted in partial fulfillment of the 
 * requirements for the degree of BCSE.  
 * Dept. Computer Science, Monash University 2000 
 * 
 *   Copyright (c) 2000 beetung@cs.monash.edu.au 
 * 			beetung@geocities.com 
 */

#include <iostream>
#include "fastbuf.h"

    XShmTester Fastbuf::hasXShm;
LListHolder<BaseNode<int> > Fastbuf::nodeHolder;

////////////////////////////////////////////////////////////////
///---begins---  XShmTester Class Function Body  ---begins---///
////////////////////////////////////////////////////////////////
//-----------------------------
 XShmTester::XShmTester() {
//-----------------------------

  // Do we have X at all? 
  //
 if ((dpy = XOpenDisplay(NULL)) ==NULL)        {
      cerr << "ERROR: Cannot open the bloody X display!!\n";
      exit(-1);
 }

 weHaveXShm = isXShmEnabled();
 if (weHaveXShm) 
	cout << " XSHM enabled... " << endl;
 else
	cout << " XSHM disabled... " << endl;
}

//-----------------------------
bool  XShmTester::isXShmEnabled(void) {
//-----------------------------
   // all standard XShm stuff... no comment necessary ?
   // we must use RGB mode, ie 24bpp as specified below 
   // on XxxxCreateImage(...)

    if ( !XShmQueryExtension (dpy) )
	return false;
    else
	return true;
}

//// What does this function do, really?
////
//-----------------------------
 void  XShmTester::NoXShmError(void)	{
//-----------------------------
 cerr << " ..XShmQueryExtension Failed." << endl;
 cerr << "..Basic X interface not implemented. get to a Linux!!" << endl << endl;
 cerr << " This Frame object is specially built for our CCC project. It is not "
	 " intended for general use." << endl;
}




/////////////////////////////////////////////////////////////
///---begins---  Fastbuf Class Function Body  ---begins---///
/////////////////////////////////////////////////////////////


//// Ctor
//-----------------------------
  Fastbuf::Fastbuf() : nodeCount(nodeHolder.getNodeCount()) {
//-----------------------------
  // Do we have X at all? 
  //
 if ((dpy = XOpenDisplay(NULL)) ==NULL)        {
      cerr << "ERROR: Cannot open the bloody X display!!\n";
      exit(-1);
 }

  if ( Fastbuf::hasXShm ) 	// its a static!
	newXShmImage();
  else
	newXImage();
}

//-----------------------------
  Fastbuf::Fastbuf(char*& bufPtr) : nodeCount(nodeHolder.getNodeCount()) {
//-----------------------------
  // Do we have X at all? 
  //
 if ((dpy = XOpenDisplay(NULL)) ==NULL)        {
      cerr << "ERROR: Cannot open the bloody X display!!"<< endl;
      exit(-1);
 }
       
 cerr << " .. passed in buffer location: using stardard BASIC_X_IMAGE"<< endl;
 newXImage(bufPtr);
}

//-----------------------------
  Fastbuf::Fastbuf(Fastbuf& fb) : nodeCount(nodeHolder.getNodeCount()) {
//-----------------------------
  // Do we have X at all? 
  //
 if ((dpy = XOpenDisplay(NULL)) ==NULL)        {
      cerr << "ERROR: Cannot open the bloody X display!!"<< endl;
      exit(-1);
 }
       
  if ( Fastbuf::hasXShm ) 	// its a static!
	newXShmImage();
  else
	newXImage();

 const int NOT_USING_VALUE = 0;
 this->mXCopy( fb , NOT_USING_VALUE);
}


//// Dtor
//-----------------------------
Fastbuf::~Fastbuf() {
//-----------------------------
  if ( Fastbuf::hasXShm )
     XDestroyImage (image);

  else if (bAlloc)	// we allocated BASIC_X buffers?
     delete [] pixel;

}