/***********************************************************************/ 
/* Copyright (C) 2002 Definitive Solutions, Inc.  All Rights Reserved. */ 
/* THIS COMPUTER PROGRAM IS PROPRIETARY AND CONFIDENTIAL TO DEFINITIVE */ 
/* SOLUTIONS, INC. AND ITS LICENSORS AND CONTAINS TRADE SECRETS OF     */ 
/* DEFINITIVE SOLUTIONS, INC. THAT ARE PROVIDED PURSUANT TO A WRITTEN  */ 
/* AGREEMENT CONTAINING RESTRICTIONS ON USE AND DISCLOSURE.  ANY USE,  */ 
/* REPRODUCTION, OR TRANSFER EXCEPT AS PROVIDED IN SUCH AGREEMENT      */ 
/* IS STRICTLY PROHIBITED.                                             */ 
/***********************************************************************/ 

#include "stdafx.h"

#include "MyMemoryDC.h"
#include "MyLog.h"
#include "MyApp.h"
#include "Generic.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


/////////////////////////////////////////////////////////////////////////////
// MyMemoryDC class

// Constructor.
MyMemoryDC::MyMemoryDC(CDC* pDC, const CRect& rcBounds) 
	: m_pOldBitmap(NULL)
	, m_pDC(pDC)
	, m_rc(rcBounds)
	, m_bMemDC(! pDC->IsPrinting())
{
	_ASSERTE(m_pDC);

	// If not printing, create a Memory DC.
	if (m_bMemDC){

		if (CreateCompatibleDC(pDC)) {

			if (m_bitmap.CreateCompatibleBitmap(pDC, m_rc.Width(), m_rc.Height())) {

				if (NULL != (m_pOldBitmap = SelectObject(&m_bitmap))) {
					SetWindowOrg(m_rc.left, m_rc.top);
				}
				else {
					DOMYLOGST(API_FAILURE), "::SelectObject", ::GetLastError(), 
						Generic::GetSysErrorString());					
				}
			}
			else {
				DOMYLOGST(API_FAILURE), "::CreateCompatibleBitmap",
					::GetLastError(), Generic::GetSysErrorString());
			}
		}
		else {
			DOMYLOGST(API_FAILURE), "::CreateCompatibleDC", ::GetLastError(),
				Generic::GetSysErrorString());
		}
	}
	else {
		// Make a copy of the relevent parts of the current DC for printing.
		m_bPrinting = pDC->m_bPrinting;
		m_hDC = pDC->m_hDC;
		m_hAttribDC = pDC->m_hAttribDC;
	}
}

// Destructor.
/* virtual */ MyMemoryDC::~MyMemoryDC()
{
	// Copy the offscreen bitmap onto the screen.
	if (m_bMemDC) {

		if (m_pDC->BitBlt(m_rc.left, m_rc.top, m_rc.Width(), m_rc.Height(), this,
			m_rc.left, m_rc.top, SRCCOPY)) {
		
			// Swap back the original bitmap.
			if (SelectObject(m_pOldBitmap)) {
				;
			}
			else {
				DOMYLOGST(API_FAILURE), "::SelectObject", ::GetLastError(),
					Generic::GetSysErrorString());
			}
		}
		else {
			DOMYLOGST(API_FAILURE), "::BitBlt", ::GetLastError(), 
				Generic::GetSysErrorString());
		}
	}
	else {
		m_hDC = m_hAttribDC = NULL;
	}
}