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DirectDraw 直接显示RGB图象的最简单实现

2024-07-02 06:40:30   217人阅读

 
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#include "DDraw.h" 

class CDDraw 
{ 
public: 
void CleanUp(); 
void DrawDIB(BITMAPINFOHEADER* pBI,char* pData,RECT*rt); 
BOOL Init(HWND hWnd,int nWidth,int nHeight); 
CDDraw(); 
virtual ~CDDraw(); 

private: 
HWND m_hDrawWnd; 
LPDIRECTDRAW lpDD; // DirectDraw 对象 
LPDIRECTDRAWSURFACE lpDDSPrimary; // DirectDraw 主页面 
LPDIRECTDRAWSURFACE lpBackdds; 
LPDIRECTDRAWCLIPPER lpClipperBack; 
}; 


CDDraw::CDDraw() 
{ 
lpDD=NULL; 
lpDDSPrimary=NULL; 
lpBackdds=NULL; 
lpClipperBack=NULL; 
} 

CDDraw::~CDDraw() 
{ 
if(lpDD!=NULL)CleanUp(); 
} 

BOOL CDDraw::Init(HWND hWnd,int nWidth,int nHeight) 
{ 
if(hWnd==NULL) return FALSE; 

m_hDrawWnd=hWnd; 

if(DirectDrawCreate(NULL,&lpDD,NULL)!=DD_OK)return FALSE; 

lpDD->SetCooperativeLevel(hWnd, DDSCL_NORMAL); 

DDSURFACEDESC ddsd; 
ddsd.dwSize = sizeof( ddsd ); //结构的大小 
ddsd.dwFlags = DDSD_CAPS; //指定DDSURFACEDESC结构的ddsCaps成员为可用 
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE; //指定要创建的是主页面 

//创建主页面对象 
if ( lpDD->CreateSurface( &ddsd, &lpDDSPrimary, NULL ) != DD_OK) return FALSE; 

if(lpDD->CreateClipper(NULL,&lpClipperBack,NULL)!=DD_OK) return FALSE; 

lpClipperBack->SetHWnd(0,hWnd); 

lpDDSPrimary->SetClipper(lpClipperBack); 

lpClipperBack->Release(); 
lpClipperBack=NULL; 

ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH; 
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN; 
ddsd.dwHeight = nHeight; 
ddsd.dwWidth = nWidth; 
if(lpDD->CreateSurface(&ddsd, &lpBackdds, NULL)!=DD_OK) return FALSE; 

return TRUE; 
} 

void CDDraw::DrawDIB(BITMAPINFOHEADER *pBI, char *pData, RECT *rt) 
{ 
RECT srt; 
srt.left=0; 
srt.top=0; 
srt.right=pBI->biWidth; 
srt.bottom=pBI->biHeight; 

HDC hDC; 
lpBackdds->GetDC(&hDC); 

SetDIBitsToDevice( 
hDC, 
0, 
0, 
pBI->biWidth, // source rectangle width 
pBI->biHeight, // source rectangle height 
0, // x-coord of source lower-left corner 
0, // y-coord of source lower-left corner 
0, // first scan line in array 
pBI->biHeight, // number of scan lines 
pData, // array of DIB bits 
(const struct tagBITMAPINFO*)pBI, // bitmap information 
DIB_RGB_COLORS // RGB or palette indexes 
); 

lpBackdds->ReleaseDC(hDC); 

lpDDSPrimary->Blt(rt,lpBackdds,&srt,0,NULL); 
} 

void CDDraw::CleanUp() 
{
if(lpDD!=NULL) 
{ 
if(lpClipperBack!=NULL) 
{ 
lpClipperBack->Release(); 
lpClipperBack=NULL; 
} 

if(lpDDSPrimary!=NULL) 
{ 
lpDDSPrimary->Release(); 
lpDDSPrimary=NULL; 
} 

if(lpBackdds!=NULL) 
{ 
lpBackdds->Release(); 
lpBackdds=NULL; 
} 

lpDD->Release(); 
lpDD=NULL; 
} 
} (ixmy)
 
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