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Visual C++

DirectDraw.cpp：源码内容
							// DDraw.cpp: implementation of the CDirectDraw class.
//
//////////////////////////////////////////////////////////////////////
#include "..stdafx.h"
#include "DirectDraw.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#pragma comment(lib,"ddraw.lib")
#pragma comment(lib,"dxguid.lib")
CDirectDraw::CDirectDraw()
{
	this->m_hWnd=NULL; 
	this->wndText = "";
	
	memset(&this->ddsd,0,sizeof(this->ddsd)); 
	this->lpDD=NULL; 
	this->lpDDSPrimary=NULL;
	this->lpDDSOffscreen=NULL; 
	this->lpClipper=NULL; 
		
	this->bitmap_width=0;
	this->bitmap_height=0;
	this->bitmap_depth=0;
	this->bitmap_size=0; 
	
	this->screen_width=0;
	this->screen_height=0;
	this->screen_depth=0; 
	this->ddraw_buffer=NULL;
}
CDirectDraw::~CDirectDraw()
{
	this->ReleaseDirectDraw( );
}
BOOL CDirectDraw::InitDirectDraw( HWND hwnd , int width , int height , int depth )
{
	if( ! ::IsWindow( hwnd ) ) return FALSE;
	LPDIRECTDRAW lpdd = NULL;
	//创建DirectDraw
	if( FAILED( DirectDrawCreate( NULL ,&lpdd , NULL ) ) ) 
		
		return FALSE;
	lpdd->QueryInterface( IID_IDirectDraw7 ,( void** )( &lpDD ) );
	lpdd->Release();
	if(this->lpDD == NULL)
		
		return FALSE;
	//与窗口建立关系
	if( FAILED ( this->lpDD->SetCooperativeLevel( hwnd , DDSCL_NORMAL ) ) )
	{
		this->ReleaseDirectDraw();
		
		return FALSE;
	}
	ZeroMemory( &ddsd,sizeof( ddsd ) );
	this->ddsd.dwSize = sizeof(DDSURFACEDESC2);
    this->ddsd.dwFlags = DDSD_CAPS;
    this->ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_VIDEOMEMORY;
	//创建主表面
	if( FAILED( this->lpDD->CreateSurface( &this->ddsd , &this->lpDDSPrimary , NULL ) ) )
	{
		this->ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
		if( FAILED( this->lpDD->CreateSurface( &this->ddsd , &this->lpDDSPrimary , NULL ) ) )
		{
			this->ReleaseDirectDraw();return FALSE;
		}
	}//取屏幕分辨率
	if( FAILED( this->lpDD->GetDisplayMode( &this->ddsd ) ) )
	{
		this->ReleaseDirectDraw(); return FALSE;
	}
	this->screen_width = this->ddsd.dwWidth;
	this->screen_height = this->ddsd.dwHeight;
	this->screen_depth = this->ddsd.ddpfPixelFormat.dwRGBBitCount;
	//设定屏外图像大小
	this->ddsd.dwFlags = DDSD_CAPS|DDSD_HEIGHT|DDSD_WIDTH;
    this->ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY; 
    //屏外表面图像的宽度
    this->ddsd.dwWidth = width;
    //屏外表面图像的高度
    this->ddsd.dwHeight = height;
	//创建屏外表面
    if( FAILED( this->lpDD->CreateSurface( &this->ddsd , &this->lpDDSOffscreen , NULL ) ) )
	{
		this->ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN; 
		if( FAILED( this->lpDD->CreateSurface( &this->ddsd , &this->lpDDSOffscreen,NULL ) ) )
		{
			this->ReleaseDirectDraw(); return FALSE;
		}
	}
	//创建翻转表面
	if(FAILED( this->lpDD->CreateClipper( 0 , &this->lpClipper , NULL ) ) )
	{
		this->ReleaseDirectDraw(); return FALSE;
	}//联系窗口
	if( FAILED( this->lpClipper->SetHWnd( 0 , hwnd ) ) )
	{
		this->ReleaseDirectDraw(); return FALSE;
	}//联系主表面
	if( FAILED( this->lpDDSPrimary->SetClipper( this->lpClipper ) ) )
	{
		this->ReleaseDirectDraw(); return FALSE;
	}//保存位图大小
	this->bitmap_width = width;
	this->bitmap_height = height;
	this->bitmap_depth = depth; 
    this->bitmap_size = width * height * depth / 8; 
	 if(this->ddraw_buffer == NULL )
	
		 this->ddraw_buffer = new char [ this->bitmap_width * this->bitmap_height * this->screen_depth/8 ];
    //保存窗口句柄
	this->m_hWnd = hwnd; 
	//保存窗口标题
	CWnd::FromHandle( this->m_hWnd )->GetWindowText( this->wndText );
	return TRUE;
}
void CDirectDraw::ReleaseDirectDraw( void )
{
	if( this->lpClipper )
	{
		this->lpClipper->Release(); this->lpClipper=NULL;
	}
	if( this->lpDDSOffscreen )
	{
		this->lpDDSOffscreen->Release(); this->lpDDSOffscreen=NULL;  
	}
	if( this->lpDDSPrimary ) 
	{
		this->lpDDSPrimary->Release(); this->lpDDSPrimary=NULL;
	}
	if( this->lpDD )
	{
		this->lpDD->Release(); this->lpDD=NULL;  
	}
	if( this->ddraw_buffer )
	{
		delete this->ddraw_buffer; this->ddraw_buffer=NULL;
	}
}
//转换位图使之可以用DirextDraw画图
void * CDirectDraw::ConvertImageToDDraw( void * buffer )
{   //不支持带调色板的位图
	if( ! buffer || this->bitmap_depth == 8 || this->screen_depth == 8 )
		return NULL;
 	switch( this->bitmap_depth )
	{
	case 8  : break;
	case 16 : 
		switch(this->screen_depth)
		{
		case 8  : break;
		case 16 : c_color_space::rgb555_to_rgb565(this->ddraw_buffer,buffer,this->bitmap_size);break;
		case 24 : c_color_space::rgb555_to_rgb888(this->ddraw_buffer,buffer,this->bitmap_size);break;
		case 32 : c_color_space::rgb555_to_rgb8888(this->ddraw_buffer,buffer,this->bitmap_size);break;
		}break;
	case 24 :
		switch(this->screen_depth)
		{
		case 8  : break;
		case 16 : c_color_space::rgb888_to_rgb565(this->ddraw_buffer,buffer,this->bitmap_size);break;
		case 24 : c_color_space::rgb888_to_rgb888(this->ddraw_buffer,buffer,this->bitmap_size);break; 
		case 32 : c_color_space::rgb888_to_rgb8888(this->ddraw_buffer,buffer,this->bitmap_size);break; 
		}break;
	case 32 :
		switch(this->screen_depth)
		{
		case 8  : break;
		case 16 : c_color_space::rgb8888_to_rgb565(this->ddraw_buffer,buffer,this->bitmap_size);break;
		case 24 : c_color_space::rgb8888_to_rgb888(this->ddraw_buffer,buffer,this->bitmap_size);break;
		case 32 : c_color_space::rgb8888_to_rgb8888(this->ddraw_buffer,buffer,this->bitmap_size);break;
		}break;
	}
	return this->ddraw_buffer;
}
BOOL CDirectDraw::DrawDirectDraw( void * buffer , BOOL m_bCaption , int time )
{
	if( buffer==NULL || !::IsWindow( this->m_hWnd ) ) 
		
		return FALSE;
	try
	{
		//显示图像
		HRESULT dd_result = this->lpDDSOffscreen->Lock( NULL , &this->ddsd , DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR , NULL );
		
		if( dd_result != DD_OK )
		{   //没有锁定视频表面，则判断视频表面是否丢失，如果丢失则要重置表面；否则直接返回
			if( dd_result==DDERR_SURFACELOST )
			{   //恢复视频表面
				this->lpDDSOffscreen->Restore();this->lpDDSPrimary->Restore(); 
			}
			else
				
				return FALSE;
		}//显示位图到directdraw屏外表面
		this->CopyToDDraw( this->ddsd.lpSurface , this->ConvertImageToDDraw( buffer ) ); 
		
		this->lpDDSOffscreen->Unlock( NULL );
		
		CRect rc;
		//画标题
		if( m_bCaption && ( ! this->wndText.IsEmpty( ) || time ) )
		{
			HDC  hdc=NULL;
			
			this->lpDDSOffscreen->GetDC( &hdc );
			
			::SetBkMode( hdc , TRANSPARENT );
			
			::GetClipBox( hdc , &rc );
			
			rc.DeflateRect( 5 , 5 );
			
			::SetTextColor( hdc , RGB( 225 , 0 , 0 ) ); 
			
			::DrawText( hdc , this->wndText , this->wndText.GetLength( ) , &rc , DT_LEFT );
			
			CTime tm( time );
			
			::DrawText( hdc , tm.Format( "%Y-%m-%d %H:%M:%S" ) , tm.Format( "%Y-%m-%d %H:%M:%S" ).GetLength( ) , &rc , DT_RIGHT );
			
			this->lpDDSOffscreen->ReleaseDC( hdc );
		}
		::GetWindowRect( this->m_hWnd , &rc );
		
		this->lpDDSPrimary->Blt( &rc , this->lpDDSOffscreen , NULL , DDBLT_WAIT , NULL );
		
		return TRUE;
	}
	catch( ... )
	{
		return FALSE;
	}
}
void CDirectDraw::CopyToDDraw( void * destination_buffer , void * source_buffer )
{
	if( ! destination_buffer || ! source_buffer ) 
		
		return;
    //一条扫描线的大小
	int pitch=this->bitmap_width * this->screen_depth / 8;
	BYTE* ps=( BYTE * )source_buffer;
	BYTE* pd=( BYTE * )destination_buffer;
	ps += this->bitmap_height * pitch; 
    //每次扫描一条线
	for( int i = 0 ; i < this->bitmap_height ; i++ )
	{
		memcpy( pd , ps , pitch );
        //从底部拷贝每一条扫描线
		ps-=pitch;
		pd += this->ddsd.lPitch;
	}
}

						