DirectComposition'ı başlatma

Not

Windows 10'daki uygulamalar için DirectComposition yerine Windows.UI.Composition API'lerini kullanmanızı öneririz. Daha fazla bilgi için bkz. Görsel katmanını kullanarak masaüstü uygulamanızı modernleştirme.

Bu konu, basit bir bileşim oluşturmak için gereken en az Microsoft DirectComposition nesne kümesinin nasıl oluşturulup başlatılacağını göstermektedir.

Bilmeniz gerekenler

Teknolojileri

Önkoşullar

  • C/C++
  • Microsoft Win32
  • Bileşen Nesne Modeli (COM)

Talimatlar

1. Adım: Direct3D cihaz nesnesi oluşturma

Görüntü bağdaştırıcısını temsil eden bir cihaz nesnesinin örneğini oluşturmak için Microsoft Direct3D API'sinden D3D11CreateDevice işlevini kullanın.

    ID3D11Device *m_pD3D11Device;


    D3D_FEATURE_LEVEL featureLevelSupported;

    // Create the D3D device object. The D3D11_CREATE_DEVICE_BGRA_SUPPORT
    // flag enables rendering on surfaces using Direct2D.
    hr = D3D11CreateDevice(
        nullptr,
        D3D_DRIVER_TYPE_HARDWARE,
        NULL,
        D3D11_CREATE_DEVICE_BGRA_SUPPORT, 
        NULL,
        0,
        D3D11_SDK_VERSION,
        &m_pD3D11Device,
        &featureLevelSupported,
        nullptr);

2. Adım: DXGI nesnesine bir işaretçi alma

IDXGIDevice işaretçisini Direct3D cihaz nesnesinden almak için QueryInterface yöntemini kullanın. DirectComposition, DirectComposition cihazı için tüm yüzey nesnelerini oluşturmak için Microsoft DirectX Grafik Altyapısı (DXGI) nesnesini kullanır.

    IDXGIDevice *pDXGIDevice = nullptr;

    // Check the result of calling D3D11CreateDriver.
    if (SUCCEEDED(hr))
    {
        // Create the DXGI device used to create bitmap surfaces.
        hr = m_pD3D11Device->QueryInterface(&pDXGIDevice);
    }

3. Adım: DirectComposition cihaz nesnesini oluşturma

Önceki adımda alınan IDXGIDevice işaretçisini belirterek DirectComposition cihaz nesnesinin bir örneğini oluşturmak için DCompositionCreateDevice işlevini kullanın. İşlev, bir bileşimde kullanılan diğer tüm DirectComposition nesnelerini oluşturmak için kullanılan IDCompositionDevice işaretçisini alır.

    IDCompositionDevice *m_pDCompDevice;


    if (SUCCEEDED(hr))
    {
        // Create the DirectComposition device object.
        hr = DCompositionCreateDevice(pDXGIDevice, 
                __uuidof(IDCompositionDevice), 
                reinterpret_cast<void **>(&m_pDCompDevice));
    }

4. Adım: Oluşturma hedef nesnesini oluşturma

Oluşturma hedef nesnesinin bir örneğini oluşturmak için IDCompositionDevice::CreateTargetForHwnd yöntemini kullanın. CreateTargetForHwnd çağrılması, cihaz nesnesini bileşimin görüntüleneceği uygulama penceresine bağlar.

    IDCompositionTarget *m_pDCompTarget;


    if (SUCCEEDED(hr))
    {
        // Create the composition target object based on the 
        // specified application window.
        hr = m_pDCompDevice->CreateTargetForHwnd(m_hwnd, TRUE, &m_pDCompTarget);   
    }

5. Adım: Görsel nesne oluşturma

Görsel nesne oluşturmak için IDCompositionDevice::CreateVisual yöntemini kullanın. Yöntem, görselin özelliklerini ayarlamak için kullanılan bir IDCompositionVisual işaretçisini alır. Daha fazla bilgi için bkz. görsel nesnesininÖzellikleri.

    IDCompositionVisual *pVisual = nullptr;

    // Create a visual object.          
    hr = m_pDCompDevice->CreateVisual(&pVisual);

6. Adım: Bir kompozisyon yüzeyi oluşturun ve yüzeye bir bit eşlem işleyin.

IDCompositionSurface işaretçisi oluşturun.

    IDCompositionSurface *pSurface = nullptr;

    if (SUCCEEDED(hr))
    {
        // Create a composition surface and render a GDI bitmap 
        // to the surface.
        hr = MyCreateGDIRenderedDCompSurface(m_hBitmap, &pSurface);
    }

Aşağıdaki işlev bir Microsoft DirectComposition yüzeyi oluşturur ve bitmap'i yüzeye çizer.

// MyCreateGDIRenderedDCompSurface - Creates a DirectComposition surface and 
//   copies the bitmap to the surface. 
//
// Parameters:
//   hBitmap - a GDI bitmap.
//   ppSurface - the composition surface object.
//                                                                 
HRESULT DemoApp::MyCreateGDIRenderedDCompSurface(HBITMAP hBitmap, 
        IDCompositionSurface **ppSurface)
{
    HRESULT hr = S_OK;

    int bitmapWidth = 0;
    int bitmapHeight = 0;
    int bmpSize = 0;
    BITMAP bmp = { };
    HBITMAP hBitmapOld = NULL;

    HDC hSurfaceDC = NULL;  
    HDC hBitmapDC = NULL;

    IDXGISurface1 *pDXGISurface = nullptr;
    IDCompositionSurface *pDCSurface = nullptr;
    POINT pointOffset = { };

    if (ppSurface == nullptr)
        return E_INVALIDARG;

    // Get information about the bitmap.
    bmpSize = GetObject(hBitmap, sizeof(BITMAP), &bmp);

    hr = bmpSize ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Save the bitmap dimensions.
        bitmapWidth = bmp.bmWidth;
        bitmapHeight = bmp.bmHeight;

        // Create a DirectComposition-compatible surface that is the same size 
        // as the bitmap. The DXGI_FORMAT_B8G8R8A8_UNORM flag is required for 
        // rendering on the surface using GDI via GetDC.
        hr = m_pDCompDevice->CreateSurface(bitmapWidth, bitmapHeight, 
            DXGI_FORMAT_B8G8R8A8_UNORM, DXGI_ALPHA_MODE_IGNORE, &pDCSurface);
    }

    if (SUCCEEDED(hr)) 
    {
        // Begin rendering to the surface.
        hr = pDCSurface->BeginDraw(NULL, __uuidof(IDXGISurface1), 
            reinterpret_cast<void**>(&pDXGISurface), &pointOffset);
    }

    if (SUCCEEDED(hr)) 
    {
        // Get the device context (DC) for the surface.
        hr = pDXGISurface->GetDC(FALSE, &hSurfaceDC);
    }

    if (SUCCEEDED(hr))
    {
        // Create a compatible DC and select the surface 
        // into the DC.
        hBitmapDC = CreateCompatibleDC(hSurfaceDC);
        if (hBitmapDC != NULL)
        {
            hBitmapOld = (HBITMAP)SelectObject(hBitmapDC, hBitmap);
            BitBlt(hSurfaceDC, pointOffset.x, pointOffset.y, 
                bitmapWidth, bitmapHeight, hBitmapDC, 0, 0, SRCCOPY);
            
            if (hBitmapOld)
            {
                SelectObject(hBitmapDC, hBitmapOld);
            }
            DeleteDC(hBitmapDC);
        }

        pDXGISurface->ReleaseDC(NULL);
    }

    // End the rendering.
    pDCSurface->EndDraw();
    *ppSurface = pDCSurface;

    // Call an application-defined macro to free the surface pointer.
    SafeRelease(&pDXGISurface);

    return hr;
}

7. Adım: Yüzeyi görsele bağlama ve görsel nesnesinin özelliklerini ayarlama

Görselin özelliklerini ayarlamak için görsel nesnesinin IDCompositionVisual arabiriminin yöntemlerini çağırın.

Bu sonraki örnek görselin bit eşlem içeriğini ve kapsayıcısının sol üst köşesine göre görselin yatay ve dikey konumunu ayarlar. Kök görsel olduğundan, bu görselin kapsayıcısı oluşturma hedef penceresidir.

    if (SUCCEEDED(hr))
    {
        // Set the bitmap content of the visual. 
        hr = pVisual->SetContent(pSurface);
    }

    if (SUCCEEDED(hr))
    {
        // Set the horizontal and vertical position of the visual relative
        // to the upper-left corner of the composition target window.
        hr = pVisual->SetOffsetX(xOffset);  
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(yOffset);  
        }
    }

8. Adım: Görsel ağacının kök görselini ayarlama

IDCompositionTarget::SetRoot yöntemini çağırarak görsel ağacının kök görselini ayarlayın.

    if (SUCCEEDED(hr))
    {
        // Set the visual to be the root of the visual tree.          
        hr = m_pDCompTarget->SetRoot(pVisual);  
    }

9. Adım: Bileşimi işleme

Komutları işleme için DirectComposition'a gönderen IDCompositionDevice::Commit yöntemini çağırın. Sonuçta elde edilen bileşim hedef pencerede görünür.

    if (SUCCEEDED(hr))
    {
        // Commit the visual to be composed and displayed.
        hr = m_pDCompDevice->Commit();  
    }

10. Adım: DirectComposition nesnelerini serbest bırakma

Artık ihtiyaç duymadığınız anda görsel nesnelerin serbest kalması iyi bir programlama uygulamasıdır. Uygulama tanımlı SafeRelease makrosunu, görsel nesneyi serbest bırakmak için aşağıdaki örnek çağırır.

    // Free the visual. 
    SafeRelease(&pVisual);

Ayrıca, uygulamanızdan çıkmadan önce DXGI nesnesini, cihaz nesnesini ve oluşturma hedef nesnesini boşaltmayı unutmayın.

    SafeRelease(&pDXGIDevice);

    SafeRelease(&m_pDCompDevice);
    SafeRelease(&m_pDCompTarget);
    SafeRelease(&m_pD3D11Device);

Tam örnek

//
// SimpleComposition.h
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved

#pragma once
// Modify the following definitions if you need to target a platform prior to the ones specified below.
#ifndef WINVER              // Allow use of features specific to Windows 7 or later.
#define WINVER 0x0700       // Change this to the appropriate value to target other versions of Windows.
#endif

#ifndef _WIN32_WINNT        // Allow use of features specific to Windows 7 or later.
#define _WIN32_WINNT 0x0700 // Change this to the appropriate value to target other versions of Windows.
#endif

#ifndef UNICODE
#define UNICODE
#endif

#define WIN32_LEAN_AND_MEAN     // Exclude rarely-used items from Windows headers

// Windows Header Files:
#include <windows.h>

// C RunTime Header Files
#include <math.h>

// DirectComposition Header Files
#include <dcomp.h>

// Direct3D Header Files
#include <d3d11.h>

/******************************************************************
*                                                                 *
*  Macros                                                         *
*                                                                 *
******************************************************************/
template<class Interface>
inline void
SafeRelease(
    Interface **ppInterfaceToRelease
    )
{
    if (*ppInterfaceToRelease != NULL)
    {
        (*ppInterfaceToRelease)->Release();

        (*ppInterfaceToRelease) = NULL;
    }
}

#ifndef HINST_THISCOMPONENT
EXTERN_C IMAGE_DOS_HEADER __ImageBase;
#define HINST_THISCOMPONENT ((HINSTANCE)&__ImageBase)
#endif

/******************************************************************
*                                                                 *
*  DemoApp                                                        *
*                                                                 *
******************************************************************/

class DemoApp
{
public:
    DemoApp();
    ~DemoApp();

    HRESULT Initialize();

    void RunMessageLoop();

private:
    HRESULT InitializeDirectCompositionDevice();

    HRESULT CreateResources();
    void DiscardResources();

    HRESULT OnClientClick();

    HRESULT LoadResourceGDIBitmap(
        PCWSTR resourceName, 
        HBITMAP &hbmp
        );

    HRESULT MyCreateGDIRenderedDCompSurface(HBITMAP hBitmap, 
        IDCompositionSurface **ppSurface);

    static LRESULT CALLBACK WndProc(
        HWND hWnd,
        UINT message,
        WPARAM wParam,
        LPARAM lParam
        );

 private:
    HWND m_hwnd;
    HBITMAP m_hBitmap;
    ID3D11Device *m_pD3D11Device;
    IDCompositionDevice *m_pDCompDevice;
    IDCompositionTarget *m_pDCompTarget;
 };


//
// SimpleComposition.cpp
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved

// Instructions: Right-click in the client area to cause DirectCompostion
// to create a simple composition consisting of a single GDI bitmap.

#include "SimpleComposition.h"

/******************************************************************
*                                                                 *
*  The application entry point.                                   *
*                                                                 *
******************************************************************/

int WINAPI WinMain(
    HINSTANCE /* hInstance */,
    HINSTANCE /* hPrevInstance */,
    LPSTR /* lpCmdLine */,
    int /* nCmdShow */
    )
{
    // Ignore the return value because we want to run the program even in the
    // unlikely event that HeapSetInformation fails.
    HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
    if (SUCCEEDED(CoInitialize(NULL)))
    {
        {
            DemoApp app;

            if (SUCCEEDED(app.Initialize()))
            {
                app.RunMessageLoop();
            }
        }
        CoUninitialize();
    }

    return 0;
}

/******************************************************************
*                                                                 *
*  DemoApp::DemoApp constructor                                   *
*                                                                 *
*  Initialize member data.                                         *
*                                                                 *
******************************************************************/

DemoApp::DemoApp() :
    m_hwnd(NULL),
    m_hBitmap(NULL),
    m_pDCompDevice(nullptr),
    m_pDCompTarget(nullptr),
    m_pD3D11Device(nullptr)
{
}

/******************************************************************
*                                                                 *
*  Release resources.                                             *
*                                                                 *
******************************************************************/

DemoApp::~DemoApp()
{
    SafeRelease(&m_pDCompDevice);
    SafeRelease(&m_pDCompTarget);
    SafeRelease(&m_pD3D11Device);
}

/*******************************************************************
*                                                                  *
*  Create the application window.                                  *
*                                                                  *
*******************************************************************/

HRESULT DemoApp::Initialize()
{
    HRESULT hr;

    // Register the window class.
    WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = DemoApp::WndProc;
    wcex.cbClsExtra    = 0;
    wcex.cbWndExtra    = sizeof(LONG_PTR);
    wcex.hInstance     = HINST_THISCOMPONENT;
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName  = nullptr;
    wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wcex.lpszClassName = L"DirectCompDemoApp";

    RegisterClassEx(&wcex);

    // Create the application window.
    //
    // Because the CreateWindow function takes its size in pixels, we
    // obtain the system DPI and use it to scale the window size.
    int dpiX = 0;
    int dpiY = 0;
    HDC hdc = GetDC(NULL);
    if (hdc)
    {
        dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
        dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
        ReleaseDC(NULL, hdc);
    }

    m_hwnd = CreateWindow(
        L"DirectCompDemoApp",
        L"DirectComposition Demo Application",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        static_cast<UINT>(ceil(640.f * dpiX / 96.f)),
        static_cast<UINT>(ceil(480.f * dpiY / 96.f)),
        NULL,
        NULL,
        HINST_THISCOMPONENT,
        this
        );

    hr = m_hwnd ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        ShowWindow(m_hwnd, SW_SHOWNORMAL);
        UpdateWindow(m_hwnd);

        // Initialize DirectComposition resources, such as the
        // device object and composition target object.
        hr = InitializeDirectCompositionDevice();
    }

    if (SUCCEEDED(hr))
    {
        hr = CreateResources();
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  This method creates the DirectComposition device object and    *
*  and the composition target object. These objects endure for    *
*  the lifetime of the application.                               *
*                                                                 *
******************************************************************/

HRESULT DemoApp::InitializeDirectCompositionDevice()
{
    HRESULT hr = S_OK;

    D3D_FEATURE_LEVEL featureLevelSupported;

    // Create the D3D device object. The D3D11_CREATE_DEVICE_BGRA_SUPPORT
    // flag enables rendering on surfaces using Direct2D.
    hr = D3D11CreateDevice(
        nullptr,
        D3D_DRIVER_TYPE_HARDWARE,
        NULL,
        D3D11_CREATE_DEVICE_BGRA_SUPPORT, 
        NULL,
        0,
        D3D11_SDK_VERSION,
        &m_pD3D11Device,
        &featureLevelSupported,
        nullptr);

    IDXGIDevice *pDXGIDevice = nullptr;

    // Check the result of calling D3D11CreateDriver.
    if (SUCCEEDED(hr))
    {
        // Create the DXGI device used to create bitmap surfaces.
        hr = m_pD3D11Device->QueryInterface(&pDXGIDevice);
    }

    if (SUCCEEDED(hr))
    {
        // Create the DirectComposition device object.
        hr = DCompositionCreateDevice(pDXGIDevice, 
                __uuidof(IDCompositionDevice), 
                reinterpret_cast<void **>(&m_pDCompDevice));
    }
    if (SUCCEEDED(hr))
    {
        // Create the composition target object based on the 
        // specified application window.
        hr = m_pDCompDevice->CreateTargetForHwnd(m_hwnd, TRUE, &m_pDCompTarget);   
    }

    SafeRelease(&pDXGIDevice);

    return hr;
}

/******************************************************************
*                                                                 *
*  This method creates the GDI bitmap that the application gives  *
*  to DirectComposition to be composed.                           *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateResources()
{
    HRESULT hr = S_OK;

    hr = LoadResourceGDIBitmap(L"Logo", m_hBitmap);
   
    return hr;
}

/******************************************************************
*                                                                 *
*  Discard device-specific resources.                             *
*                                                                 *
******************************************************************/

void DemoApp::DiscardResources()
{
    DeleteObject(m_hBitmap);
}

/******************************************************************
*                                                                 *
*  The main window&#39;s message loop.                                *
*                                                                 *
******************************************************************/

void DemoApp::RunMessageLoop()
{
    MSG msg;

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

/******************************************************************
*                                                                 *
*  Called whenever the user clicks in client area of the main     *
*  window. This method builds a simple visual tree and passes it  *   
*  to DirectComposition.
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnClientClick()
{
    HRESULT hr = S_OK;
    float xOffset = 20; // horizonal position of visual
    float yOffset = 20; // vertical position of visual

    IDCompositionVisual *pVisual = nullptr;

    // Create a visual object.          
    hr = m_pDCompDevice->CreateVisual(&pVisual);  

    IDCompositionSurface *pSurface = nullptr;

    if (SUCCEEDED(hr))
    {
        // Create a composition surface and render a GDI bitmap 
        // to the surface.
        hr = MyCreateGDIRenderedDCompSurface(m_hBitmap, &pSurface);
    }

    if (SUCCEEDED(hr))
    {
        // Set the bitmap content of the visual. 
        hr = pVisual->SetContent(pSurface);
    }

    if (SUCCEEDED(hr))
    {
        // Set the horizontal and vertical position of the visual relative
        // to the upper-left corner of the composition target window.
        hr = pVisual->SetOffsetX(xOffset);  
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(yOffset);  
        }
    }

    if (SUCCEEDED(hr))
    {
        // Set the visual to be the root of the visual tree.          
        hr = m_pDCompTarget->SetRoot(pVisual);  
    }

    if (SUCCEEDED(hr))
    {
        // Commit the visual to be composed and displayed.
        hr = m_pDCompDevice->Commit();  
    }

    // Free the visual. 
    SafeRelease(&pVisual);

    return hr;
}

/******************************************************************
*                                                                 *
*  The window&#39;s message handler.                                  *
*                                                                 *
******************************************************************/

LRESULT CALLBACK DemoApp::WndProc(HWND hwnd, UINT message, 
        WPARAM wParam, LPARAM lParam)
{
    LRESULT result = 0;

    if (message == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        DemoApp *pDemoApp = (DemoApp *)pcs->lpCreateParams;

        ::SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pDemoApp)
            );

        result = 1;
    }
    else
    {
        DemoApp *pDemoApp = reinterpret_cast<DemoApp *>(static_cast<LONG_PTR>(
            ::GetWindowLongPtrW(
                hwnd,
                GWLP_USERDATA
                )));

        bool wasHandled = false;

        if (pDemoApp)
        {
            switch (message)
            {
            case WM_LBUTTONDOWN:
                {
                    pDemoApp->OnClientClick();
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_DISPLAYCHANGE:
                {
                    InvalidateRect(hwnd, NULL, FALSE);
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_DESTROY:
                {
                    PostQuitMessage(0);
                    pDemoApp->DiscardResources();
                }
                wasHandled = true;
                result = 1;
                break;
            }
        }

        if (!wasHandled)
        {
            result = DefWindowProc(hwnd, message, wParam, lParam);
        }
    }

    return result;
}

/******************************************************************
*                                                                 *
*  This method loads the specified GDI bitmap from the            *
*  application resources, creates a new bitmap that is in a       *
*  format that DirectComposition can use, and copies the contents *
*  of the original bitmap to the new bitmap.                      *
*                                                                 *
******************************************************************/

HRESULT DemoApp::LoadResourceGDIBitmap(PCWSTR resourceName, HBITMAP &hbmp)
{
    hbmp = static_cast<HBITMAP>(LoadImageW(HINST_THISCOMPONENT, resourceName, 
        IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR));  
 
    return hbmp ? S_OK : E_FAIL;
}


// MyCreateGDIRenderedDCompSurface - Creates a DirectComposition surface and 
//   copies the bitmap to the surface. 
//
// Parameters:
//   hBitmap - a GDI bitmap.
//   ppSurface - the composition surface object.
//                                                                 
HRESULT DemoApp::MyCreateGDIRenderedDCompSurface(HBITMAP hBitmap, 
        IDCompositionSurface **ppSurface)
{
    HRESULT hr = S_OK;

    int bitmapWidth = 0;
    int bitmapHeight = 0;
    int bmpSize = 0;
    BITMAP bmp = { };
    HBITMAP hBitmapOld = NULL;

    HDC hSurfaceDC = NULL;  
    HDC hBitmapDC = NULL;

    IDXGISurface1 *pDXGISurface = nullptr;
    IDCompositionSurface *pDCSurface = nullptr;
    POINT pointOffset = { };

    if (ppSurface == nullptr)
        return E_INVALIDARG;

    // Get information about the bitmap.
    bmpSize = GetObject(hBitmap, sizeof(BITMAP), &bmp);

    hr = bmpSize ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Save the bitmap dimensions.
        bitmapWidth = bmp.bmWidth;
        bitmapHeight = bmp.bmHeight;

        // Create a DirectComposition-compatible surface that is the same size 
        // as the bitmap. The DXGI_FORMAT_B8G8R8A8_UNORM flag is required for 
        // rendering on the surface using GDI via GetDC.
        hr = m_pDCompDevice->CreateSurface(bitmapWidth, bitmapHeight, 
            DXGI_FORMAT_B8G8R8A8_UNORM, DXGI_ALPHA_MODE_IGNORE, &pDCSurface);
    }

    if (SUCCEEDED(hr)) 
    {
        // Begin rendering to the surface.
        hr = pDCSurface->BeginDraw(NULL, __uuidof(IDXGISurface1), 
            reinterpret_cast<void**>(&pDXGISurface), &pointOffset);
    }

    if (SUCCEEDED(hr)) 
    {
        // Get the device context (DC) for the surface.
        hr = pDXGISurface->GetDC(FALSE, &hSurfaceDC);
    }

    if (SUCCEEDED(hr))
    {
        // Create a compatible DC and select the surface 
        // into the DC.
        hBitmapDC = CreateCompatibleDC(hSurfaceDC);
        if (hBitmapDC != NULL)
        {
            hBitmapOld = (HBITMAP)SelectObject(hBitmapDC, hBitmap);
            BitBlt(hSurfaceDC, pointOffset.x, pointOffset.y, 
                bitmapWidth, bitmapHeight, hBitmapDC, 0, 0, SRCCOPY);
            
            if (hBitmapOld)
            {
                SelectObject(hBitmapDC, hBitmapOld);
            }
            DeleteDC(hBitmapDC);
        }

        pDXGISurface->ReleaseDC(NULL);
    }

    // End the rendering.
    pDCSurface->EndDraw();
    *ppSurface = pDCSurface;

    // Call an application-defined macro to free the surface pointer.
    SafeRelease(&pDXGISurface);

    return hr;
}

DCompositionCreateDevice

D3D11CreateDevice

IDCompositionDevice::Commit

IDCompositionDevice::CreateTargetForHwnd

IDCompositionDevice::CreateVisual

IDCompositionSurface

IDCompositionTarget::SetRoot

IDCompositionVisual::SetContent

IDXGIDevice

SafeRelease

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