www.pudn.com > DirectX_demo.zip > DirectSurface.cpp

// ------------------------------------------------------------------------- 
// CDirectSurface Class 
// ------------------------------------------------------------------------- 
 
#include "stdafx.h" 
#include "DirectSurface.h" 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Constructor 
// ------------------------------------------------------------------------- 
 
CDirectSurface::CDirectSurface() 
{ 
	m_pSurface		= NULL; 
	m_pSurfaceInfo	= NULL; 
	m_nXPos			= 0; 
	m_nYPos			= 0; 
	m_bRender		= FALSE; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Destructor 
// ------------------------------------------------------------------------- 
 
CDirectSurface::~CDirectSurface() 
{ 
	if (m_pSurfaceInfo){ 
		delete m_pSurfaceInfo; 
		m_pSurfaceInfo = NULL; 
	} 
	if (m_pSurface){ 
		m_pSurface->Release(); 
		m_pSurface = NULL; 
	} 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Clear 
// ------------------------------------------------------------------------- 
 
BOOL CDirectSurface::Clear(int nColor) 
{ 
	if (Lock()){ 
		BYTE* pAddress = (BYTE*) m_pSurfaceInfo->lpSurface; 
		DWORD dwBuffer = m_pSurfaceInfo->lPitch*m_pSurfaceInfo->dwHeight; 
		memset(pAddress,nColor,dwBuffer); 
		Unlock(); 
	} 
	return TRUE; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Create 
// ------------------------------------------------------------------------- 
 
BOOL CDirectSurface::Create(LPDIRECTDRAW2 pDD,int nWidth, int nHeight) 
{ 
	if (m_pSurface || !pDD || m_pSurfaceInfo) 
		return Error("Cannot Create OffScreen Surface Without First Creating DirectDraw Object"); 
 
	// Create Primary Surface Structure 
	m_pSurfaceInfo = new DDSURFACEDESC; 
	memset(m_pSurfaceInfo,0,sizeof(DDSURFACEDESC)); 
	m_pSurfaceInfo->dwSize = sizeof(DDSURFACEDESC); 
	m_pSurfaceInfo->dwFlags = DDSD_CAPS|DDSD_HEIGHT|DDSD_WIDTH; 
	m_pSurfaceInfo->ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN; 
	m_pSurfaceInfo->dwHeight = nHeight; 
	m_pSurfaceInfo->dwWidth = nWidth; 
 
	// Create Primary Surface 
	if (FAILED(pDD->CreateSurface(m_pSurfaceInfo,&m_pSurface,NULL))) 
		return Error("OffScreen Surface Creation Failure"); 
 
	return TRUE; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Create From Resource Bitmap 
// ------------------------------------------------------------------------- 
 
BOOL CDirectSurface::Create(LPDIRECTDRAW2 pDD, UINT uiResBmpId) 
{ 
	// Load Bitmap 
    HBITMAP hbm = (HBITMAP)LoadImage(AfxGetResourceHandle(),MAKEINTRESOURCE((WORD)uiResBmpId),IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION); 
	if (!hbm) 
		return Error("Cannot Load Resource Bitmap"); 
 
	// Get Bitmap Size 
	BITMAP bmInfo; 
	GetObject(hbm,sizeof(BITMAP),&bmInfo); 
 
	// Create Surface 
	Create(pDD,bmInfo.bmWidth,bmInfo.bmHeight); 
 
	// Create Compatible DC 
    HDC hdcBitmap = CreateCompatibleDC(NULL); 
	if (!hdcBitmap) 
		return Error("Cannot Create DC For Surface Bitmap Copy"); 
 
	// Select Object 
    SelectObject(hdcBitmap,hbm); 
 
	// Copy Bitmap 
	HDC hdc; 
	if (FAILED(m_pSurface->GetDC(&hdc))) 
		return Error("Cannot Get Surface Device Context"); 
 
	StretchBlt(hdc,0,0,bmInfo.bmWidth,bmInfo.bmHeight,hdcBitmap,0,0,bmInfo.bmWidth,bmInfo.bmHeight,SRCCOPY); 
 
	// Cleanup 
	m_pSurface->ReleaseDC(hdc); 
    DeleteDC(hdcBitmap); 
    DeleteObject(hbm); 
 
	return TRUE; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Lock 
// ------------------------------------------------------------------------- 
 
BOOL CDirectSurface::Lock() 
{ 
	memset(m_pSurfaceInfo,0,sizeof(DDSURFACEDESC)); 
	m_pSurfaceInfo->dwSize = sizeof(DDSURFACEDESC); 
	if (FAILED(m_pSurface->Lock(NULL,m_pSurfaceInfo,DDLOCK_WAIT,NULL))) 
		return Error("Could Not Lock Off Screen Surface For Drawing"); 
 
	return TRUE; 
 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Set Position 
// ------------------------------------------------------------------------- 
 
void CDirectSurface::SetPosition(int nXPos, int nYPos) 
{ 
	m_nXPos = nXPos; 
	m_nYPos = nYPos; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Set Render 
// ------------------------------------------------------------------------- 
 
void CDirectSurface::SetRender(BOOL bRender) 
{ 
	m_bRender = bRender; 
} 
 
// ------------------------------------------------------------------------- 
// CDirectSurface Unlock 
// ------------------------------------------------------------------------- 
 
BOOL CDirectSurface::Unlock() 
{ 
	if (FAILED(m_pSurface->Unlock(m_pSurfaceInfo->lpSurface))) 
		return Error("Could Not UnLock Off Screen Surface"); 
 
	return TRUE; 
}