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第一步添加类class CUImageDC{public:CUImageDC();virtual ~CUImageDC();void Delete();void Create(int nWidth, int nHeight);HDC GetSafeHdc(void){ return m_hDC;}HBITMAP GetBmpHandle(void){ return m_hBmp;}DWORD* GetBits(void){ return (DWORD*)m_pBits;}protected:HBITMAP m_hBmp;HDC m_hDC;char* m_pBits;};CUImageDC::CUImageDC(){m_pBits = NULL;m_hBmp = NULL;m_hDC = NULL;}CUImageDC::~CUImageDC(){Delete();}void CUImageDC::Create(int nWidth, int nHeight){BITMAPINFOHEADER bih;memset(&bih, 0, sizeof(BITMAPINFOHEADER));bih.biSize = sizeof(BITMAPINFOHEADER);bih.biWidth = ((((int)nWidth * 8) + 31) & ~31) >> 3;bih.biHeight = nHeight;bih.biPlanes = 1;bih.biBitCount = 32;bih.biCompression = BI_RGB;m_hBmp = NULL;m_hDC = CreateCompatibleDC(NULL);m_hBmp = ::CreateDIBSection( GetSafeHdc(), (BITMAPINFO*)&bih, DIB_RGB_COLORS, (void**)(&m_pBits), NULL, 0);SelectObject(m_hDC, m_hBmp);}void CUImageDC::Delete(){if (m_hBmp) DeleteObject(m_hBmp);if (m_hDC) DeleteDC(m_hDC);}第二步创建变量LPDIRECT3DSURFACE9 g_pd3dSurface = NULL;CUImageDC g_dcSurface;第三步在创建好设备后添加if (FAILED(g_D3DDevice->CreateRenderTarget(640, 480, D3DFMT_A8R8G8B8, D3DMULTISAMPLE_NONE, 0, /*!g_is9Ex*/false, // lockable &g_pd3dSurface, NULL))) { return NULL; } g_D3DDevice->SetRenderTarget(0, g_pd3dSurface); g_D3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE); // turn off D3D lighting to use vertex colors g_D3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE); // Enable alpha blending. g_D3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE); g_dcSurface.Create(640, -480); SetWindowLong(hWnd, GWL_EXSTYLE, (GetWindowLong(hWnd, GWL_EXSTYLE) & ~WS_EX_TRANSPARENT) | WS_EX_LAYERED);第四步在渲染函数中添加 D3DLOCKED_RECT lockedRect; RECT rc, rcSurface = {0, 0, 640, 480}; ::GetWindowRect(hWnd, &rc); POINT ptWinPos = { rc.left, rc.top}; POINT ptSrc = { 0, 0}; SIZE szWin = { 640, 480 }; BLENDFUNCTION stBlend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA }; HDC hdcWnd = GetWindowDC(hWnd); LPDIRECT3DSURFACE9 g_psysSurface = NULL; g_D3DDevice->CreateOffscreenPlainSurface(640, 480, D3DFMT_A8R8G8B8, D3DPOOL_SYSTEMMEM, &g_psysSurface, NULL); g_D3DDevice->GetRenderTargetData(g_pd3dSurface, g_psysSurface); g_psysSurface->LockRect(&lockedRect, &rcSurface, D3DLOCK_READONLY); memcpy(g_dcSurface.GetBits(), lockedRect.pBits, 4 * 640 * 480); UpdateLayeredWindow(hWnd, hdcWnd, &ptWinPos, &szWin, g_dcSurface.GetSafeHdc(), &ptSrc, RGB(255,255,255), &stBlend, ULW_COLORKEY);::ReleaseDC(hWnd,hdcWnd); g_psysSurface->UnlockRect(); g_psysSurface->Release(); |
