dd.cpp

一个完整的2D滚屏游戏示例

#include "stdafx.h"
#include "DD.h"
#include "ddutil.h"
//////////////////////////////////////////////////////////////////////////
//
CDD::CDD()
{
//add some special code here?
}

CDD::~CDD()
{
Destroy();
}

//////////////////////////////////////////////////////////////////////////
//
CDD::CDD(HWND hwnd,UINT uScreenWidth,UINT uScreenHeight,UINT uColorDepth,LPCSTR szSourceBitmap,COLORREF rgbTran,COLORREF rgbBK)
{
Initialize(hwnd,uScreenWidth,uScreenHeight,uColorDepth,szSourceBitmap,rgbTran,rgbBK);
}

/////////////////////////////////////////////////////////////////////////////
//DirectDraw object initilize:
bool CDD::Initialize(HWND hwnd,UINT uScreenWidth,UINT uScreenHeight,UINT uColorDepth,LPCSTR szSourceBitmap,COLORREF rgbTran,COLORREF rgbBK)
{
HRESULT       ddrval;

m_nScreenHeight=uScreenHeight;//全屏幕的长宽;
m_nScreenWidth=uScreenWidth;
m_szSourceBitmap=szSourceBitmap;

//(1)Now Create the main DirectDraw object:
ddrval=DirectDrawCreate(NULL,&m_lpDD,NULL); //创建主DD对象在m_lpDD中；
if(ddrval!=DD_OK)goto Destroy;

//(2)Get EXCLUSIVE mode--(2):独占、全屏模式：
ddrval=m_lpDD->SetCooperativeLevel(hwnd,DDSCL_EXCLUSIVE|DDSCL_FULLSCREEN);
if(ddrval!=DD_OK)goto Destroy;

//(3)Set Display mode:
ddrval=m_lpDD->SetDisplayMode(uScreenWidth,uScreenHeight,uColorDepth);
if(ddrval!=DD_OK)goto Destroy;

//(4.1)Create the Primary Surface with 1 back buffer:
DDSURFACEDESC ddsd;
ddsd.dwSize=sizeof(ddsd);
//ddsd.dwRefreshRate=0;
ddsd.dwFlags=DDSD_CAPS|DDSD_BACKBUFFERCOUNT;
ddsd.ddsCaps.dwCaps=DDSCAPS_PRIMARYSURFACE|DDSCAPS_FLIP|DDSCAPS_COMPLEX; 
ddsd.dwBackBufferCount=1;          //一个后备表面；
ddrval=m_lpDD->CreateSurface(&ddsd,&m_lpDDS_Primary,NULL);//创建主表面对象在m_lpDD_Primary;
if(ddrval!=DD_OK)goto Destroy;

//(4.2)Get a pointer to the buffer:
DDSCAPS       ddscaps;
ddscaps.dwCaps=DDSCAPS_BACKBUFFER;
ddrval=m_lpDDS_Primary->GetAttachedSurface(&ddscaps,&m_lpDDS_Back);//创建主表面的后备表面在m_lpDD_Back;
if(ddrval!=DD_OK)goto Destroy;

//(5)load the image:
m_lpDDS_Source=DDLoadBitmap(m_lpDD,m_szSourceBitmap,0,0);
if(m_lpDDS_Source==NULL)goto Destroy;

//(6)Set Color RGB(0,0,0) as the color key:
ddrval=DDSetColorKey(m_lpDDS_Source,rgbTran);
if(ddrval!=DD_OK)goto Destroy;

if(!SetBkColor(rgbBK))goto Destroy;

return true;

Destroy:
  Destroy();
  DestroyWindow(hwnd);
  ErrorCheck(ddrval);
  return false;
}

///////////////////////////////////////////////////////////////////////////
//Destroy Direct Draw object:
void CDD::Destroy(void)
{
  if(m_lpDD!=NULL)
  {
    if(m_lpDDS_Primary!=NULL)
	{
	m_lpDDS_Primary->Release();
	m_lpDDS_Primary=NULL;
	}
  m_lpDD->Release();
  m_lpDD=NULL;
  }
}

///////////////////////////////////////////////////////////////////////////
//Restore All DirectDraw Objects:
HRESULT CDD::RestoreSurface(void)
{
HRESULT ddrval;
ddrval=m_lpDDS_Primary->Restore();
  if(ddrval==DD_OK)
  { 
  ddrval=m_lpDDS_Source->Restore();
    if(ddrval==DD_OK)
	{
	DDReLoadBitmap(m_lpDDS_Source,m_szSourceBitmap);
	}
  }
return ddrval;
}

///////////////////////////////////////////////////////////////////////////
//Restore All DirectDraw Objects:
HRESULT CDD::ReLoadSourceBitmap(LPCSTR szSourceBitmap)
{
HRESULT ddrval=DD_OK;
m_szSourceBitmap=szSourceBitmap;

//ddrval=m_lpDDS_Primary->Restore();
  //if(ddrval==DD_OK)
  { 
  //ddrval=m_lpDDS_Source->Restore();
    //if(ddrval==DD_OK)
	{
	DDReLoadBitmap(m_lpDDS_Source,m_szSourceBitmap);
	}
  }
return ddrval;
}

/////////////////////////////////////////////////////////////////////////////
//Blit:
bool CDD::BlitSourceToBack(int x,int y,RECT rcRect,int style)
{
bool bBlit=false;

int  nShowX=x;
int  nShowY=y;

int  nHeight=rcRect.bottom-rcRect.top+1;
int  nWidth =rcRect.right-rcRect.left+1;

RECT rcShow=rcRect;

	////先判断x,y,rect,与屏幕的关系,以确定确实要BLIT的区域及位置:
	////X方向;
	if(x<=(-nWidth+1))	
	return true;
	if(((-nWidth+1)<x)&&(x<0))//(-nWidth<x<0)
	{
	nShowX=0;
	rcShow.left=rcRect.left-x;
	rcShow.right=rcRect.right;
	}
    if((0<=x)&&(x<=m_nScreenWidth-nWidth))
	{
	nShowX=x;
	rcShow.left=rcRect.left;
	rcShow.right=rcRect.right;
	}
	if((m_nScreenWidth-nWidth<x)&&(x<m_nScreenWidth-1))
	{
	nShowX=x;
	rcShow.left=rcRect.left;
	rcShow.right=rcRect.left+(m_nScreenWidth-x)-1;
	}
	if(x>=m_nScreenWidth-1)
	return true;
	
	////Y方向;
	if(y<=(-nHeight+1))	
	return true;
	
	if(((-nHeight+1)<y)&&(y<0))//(-nWidth<x<0)
	{
	nShowY=0;
	rcShow.top=rcRect.top-y;
	rcShow.bottom=rcRect.bottom;
	goto BLIT;
	}
    
	if((0<=y)&&(y<=m_nScreenHeight-nHeight))
	{
	nShowY=y;
	rcShow.top=rcRect.top;
	rcShow.bottom=rcRect.bottom;
	goto BLIT;
	}
	if((m_nScreenHeight-nHeight<y)&&(y<m_nScreenHeight-1))
	{
	nShowY=y;
	rcShow.top=rcRect.top;
	rcShow.bottom=rcRect.top+(m_nScreenHeight-y)-1;
	goto BLIT;
	}
	
    if(y>=m_nScreenHeight-1)
	return true;
		
BLIT:;	
HRESULT ddrval;
ddrval=m_lpDDS_Back->BltFast(nShowX,nShowY,
                             m_lpDDS_Source,&rcShow,		                   
	                         style);
  while(true) 
  {
    if(ddrval==DD_OK)return true;
    if(ddrval==DDERR_SURFACELOST)