DirectDraw 直接显示RGB图象的最简单实现

#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)