//////////////////////////////////////////////////////////////////////////////
//文件 MemDC.h
//主要功能: 
//
//程序编写:		2005-12-07
/////////////////////////////////////////////////////////////////////////////

#pragma once
#include "afxwin.h"
#include "DrawLocal/MemAlloc.h"

class AFX_EXT_CLASS CMemoryDC : public CDC
{
public:
	CMemoryDC(void);
	virtual ~CMemoryDC(void);

public:
	virtual BOOL Create(CSize &pImageSize,int nBPP=0, CDC* pDC=NULL);
	virtual CSize GetSize(void);
	virtual void Empty(void);

	void Erase(COLORREF pColor);
	void FromDC(CDC* pDC); //从指定DC获得显示内容
	void Draw(CDC* pDC, int x, int y);					//不拉伸显示
	void Draw(CDC* pDC, int x, int y, int cx, int cy);	//拉伸显示

	BOOL WriteBitmap(LPCTSTR lpFileName, int nBt=0, BOOL bCompr=FALSE);
	BOOL Save(LPCTSTR lpFileName);
	BOOL CopyToClipboard(HWND hWnd=NULL);

	static BOOL FileDialog(BOOL bOpenFileDialog , CString &name);
	static CString GetFilterType(BOOL bOpenFileDialog);

	HBITMAP CMemoryDC::Detach();
	operator HBITMAP(void) const;
    operator CMemoryDC*();					// Allow usage as a pointer
    CMemoryDC* operator->() {return this;}	// Allow usage as a pointer

protected:
	CMemAlloc m_memAlloc;
	CImage image;
	CSize cImageSize;
	HBITMAP m_hOldBitmap;
};

AFX_INLINE CMemoryDC::operator HBITMAP(void) const
{
	return (HBITMAP)image;
}

AFX_INLINE CMemoryDC::operator CMemoryDC*()
{
	return this;
}

AFX_INLINE CSize CMemoryDC::GetSize(void)
{
	return cImageSize;
}