在DirectX上渲染DirectX元素时C++闪烁camCaptureWindow

Question

我正在创建一个应用程序，它使用directx通过网络摄像头在win32捕获窗口上渲染图像，但是我正在窗口闪烁其他每一帧。 （这似乎来自directx每帧清除屏幕，因为闪烁的颜色与清晰的颜色相同）

有没有什么办法可以解决这个问题？ （我无法弄清楚如何提供摄像机的输入，而不使用Win32）

而且这里是我的项目代码：

Windows.cpp：

#include <windows.h> 
#include <vfw.h> 
#include <wchar.h> 
#include "Game.h" 
#include "resource.h" 
#include "Mouse.h" 

LRESULT CALLBACK WindowProc (HWND, UINT, WPARAM, LPARAM); 

static KeyboardServer kServ; 
static MouseServer mServ; 

char szAppName [] = TEXT("Webcam"); 
HWND camhwnd; 
HDC hdc ; 
HDC hdcMem; 
PAINTSTRUCT ps; 
HBITMAP hbm; 
RECT rc; 

//WinMain -- Main Window 
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { 

    HWND hwnd; 
    MSG msg; 

    WNDCLASS wc; 
    wc.style = CS_HREDRAW|CS_VREDRAW; 
    wc.lpfnWndProc = WindowProc; 
    wc.cbClsExtra = 0; 
    wc.cbWndExtra = 0; 
    wc.hInstance = hInstance; 
    wc.hIcon = LoadIcon(GetModuleHandle(NULL), IDI_APPLICATION); 
    wc.hCursor = LoadCursor (NULL, IDC_ARROW); 
    wc.hbrBackground = (HBRUSH) (COLOR_WINDOW+1); 
    wc.lpszMenuName = NULL; 
    wc.lpszClassName = szAppName; 

    RegisterClass (&wc); 


    hwnd = CreateWindow (szAppName,szAppName,WS_POPUP | WS_VISIBLE,0,0,1920,1080,0,0,hInstance,0); 


    ShowWindow (hwnd,SW_SHOW); 
    UpdateWindow (hwnd); 

    ShowWindow(camhwnd,SW_SHOW); 
    SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0); 
    SendMessage(camhwnd, WM_CAP_SET_SCALE, true , 0); 
    SendMessage(camhwnd, WM_CAP_SET_PREVIEWRATE, 66, 0); 
    SendMessage(camhwnd, WM_CAP_SET_PREVIEW, true , 0); 



    Game theGame(hwnd,kServ,mServ); 


    while(msg.message != WM_QUIT) { 
     if(PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { 
      TranslateMessage(&msg); 
      DispatchMessage(&msg); 
     } 
     else { 
      theGame.Go(); 
     } 
    } 

    return msg.wParam; 
} 

//Main Window Procedure WindowProc 
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { 
    HINSTANCE hInstance = GetModuleHandle(NULL); 

    switch (message) { 
     case WM_CREATE: { 

      camhwnd = capCreateCaptureWindow ("camera window", WS_CHILD , 0, 0, 1920, 1080, hwnd, 0); 
      SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0); 
      SendMessage(camhwnd,WM_CAP_DLG_VIDEOSOURCE,0,0); 

      break; 

     } 

     case WM_DESTROY: { 
      SendMessage(camhwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0); 
      PostQuitMessage(0); 
      break; 
     } 

     default: 
      return DefWindowProc(hwnd, message, wParam, lParam); 
    } 
    return 0; 
} 

游戏的一部分的.cpp：

void Game::Go() 
{ 
    gfx.BeginFrame(); 
    ComposeFrame(); 
    gfx.EndFrame(); 
} 

最后，一块D3DGraphics.cpp的：

D3DGraphics::D3DGraphics(HWND hWnd) 
{ 
    HRESULT result; 

    backRect.pBits = NULL; 

    pDirect3D = Direct3DCreate9(D3D_SDK_VERSION); 
    assert(pDirect3D != NULL); 

    D3DPRESENT_PARAMETERS d3dpp; 
    ZeroMemory(&d3dpp,sizeof(d3dpp)); 
    d3dpp.Windowed = TRUE; 
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; 
    d3dpp.BackBufferFormat = D3DFMT_UNKNOWN; 
    d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE; 
    d3dpp.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER; 

    result = pDirect3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,hWnd, 
     D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_PUREDEVICE,&d3dpp,&pDevice); 
    assert(!FAILED(result)); 

    result = pDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&pBackBuffer); 
    assert(!FAILED(result)); 
} 

void D3DGraphics::BeginFrame() 
{ 
    HRESULT result; 

    result = pDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(255,255,255),0.0f,0); 
    assert(!FAILED(result)); 

    result = pBackBuffer->LockRect(&backRect,NULL,NULL); 
    assert(!FAILED(result)); 
} 

void D3DGraphics::EndFrame() 
{ 
    HRESULT result; 

    result = pBackBuffer->UnlockRect(); 
    assert(!FAILED(result)); 

    result = pDevice->Present(NULL,NULL,NULL,NULL); 
    assert(!FAILED(result)); 
} 

Answer 1

您可以尝试将WS_CLIPSIBLINGS和WS_CLIPCHILDREN添加到主窗口。有关这些窗口样式的更多信息here。