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Cómo animar el mapa de bits de una ventana secundaria superpuesta

Nota:

En el caso de las aplicaciones de Windows 10, se recomienda usar las API de Windows.UI.Composition en lugar de DirectComposition. Para obtener más información, consulta Modernize your desktop app using the Visual layer (Modernización de la aplicación de escritorio mediante la capa visual).

En este tema se describe cómo crear y animar un objeto visual que usa el mapa de bits de una ventana secundaria superpuesta como contenido del objeto visual. En el ejemplo descrito en este tema se usa una transformación de escala animada para "aumentar" el mapa de bits de una ventana secundaria del tamaño de pulgar al tamaño completo. Para obtener más información sobre las ventanas superpuestas, vea Mapas de bits de ventana.

Lo que necesita saber

Tecnologías

Requisitos previos

  • C/C++
  • Microsoft Win32
  • Modelo de objetos componentes (COM)

Instrucciones

Paso 1: Crear una ventana secundaria superpuesta

Siga estos pasos para crear una ventana secundaria superpuesta.

  1. Registre la clase de ventana secundaria y cree una ventana secundaria que tenga el estilo WS_EX_LAYERED . En el ejemplo siguiente, m_dpiX y m_dpiY especifique la resolución de pantalla en píxeles por pulgada lógica y m_hwndMain es el identificador de la ventana principal de la aplicación.
    HWND m_hwndLayeredChild;

    
HRESULT hr = S_OK;

    WNDCLASSEXW wcex;
    wcex.cbSize         = sizeof(wcex);
    wcex.style          = 0;
    wcex.lpfnWndProc    = DemoApp::ChildWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = HINST_THISCOMPONENT;
    wcex.hIcon          = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH) GetStockObject(GRAY_BRUSH);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = L"DCompLayeredChildWindow";
    wcex.hIconSm        = NULL;

    if (!RegisterClassExW(&wcex))
    {
        return FALSE;
    }

    m_hwndLayeredChild = CreateWindowEx(WS_EX_LAYERED,
        L"DCompLayeredChildWindow",
        NULL,
        WS_CHILD | WS_CLIPSIBLINGS,
        0,
        0,
        static_cast<UINT>(ceil(640.0f * m_dpiX / 96.0f)),
        static_cast<UINT>(ceil(480.0f * m_dpiY / 96.0f)),
        m_hwndMain,
        NULL,
        HINST_THISCOMPONENT,
        this);
  1. Llame a la función SetLayeredWindowAttributes para establecer la clave de color de transparencia y la opacidad de la ventana secundaria superpuesta. El código siguiente establece la clave de color de transparencia en cero y la opacidad en 255 (opaco).
    if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
    {
        hr = HRESULT_FROM_WIN32(GetLastError());
    }
  1. Representar contenido en la ventana secundaria.

Paso 2: Inicializar objetos DirectComposition

Cree el objeto de dispositivo y el objeto de destino de composición. Para obtener más información, vea Cómo inicializar DirectComposition.

Paso 3: Crear un objeto visual y establecer el mapa de bits de la ventana secundaria superpuesta como la propiedad de contenido

Siga estos pasos para crear un objeto visual, establecer su propiedad de contenido para usar el mapa de bits de la ventana secundaria superpuesta y, a continuación, agregar el objeto visual al árbol visual.

  1. Llame a IDCompositionDevice::CreateVisual para crear un objeto visual.
  2. Cree una superficie de Microsoft DirectComposition para la ventana secundaria superpuesta pasando el identificador de la ventana secundaria a la función CreateSurfaceFromHwnd .
  3. Llame al método IDCompositionVisual::SetContent del objeto visual para establecer la nueva superficie como el contenido visual de la ventana secundaria superpuesta.
  4. Agregue el objeto visual al árbol visual. Para agregar el objeto visual a la raíz del árbol, llame al método IDCompositionTarget::SetRoot . Para agregar el objeto visual como elemento secundario de otro objeto visual, use el método IDCompositionVisual::AddVisual del objeto visual primario.

En el ejemplo siguiente se crea un objeto visual, se establece su propiedad Content para usar el mapa de bits de la ventana secundaria superpuesta y se agrega el objeto visual a la raíz del árbol visual.

IDCompositionVisual *pVisual = nullptr;
IUnknown* pSurface    = nullptr;

hr = m_pDevice->CreateVisual(&pVisual);
if (SUCCEEDED(hr))
{
    hr = m_pDevice->CreateSurfaceFromHwnd(m_hwndLayeredChild, &pSurface);
}

if (SUCCEEDED(hr))
{
    hr = pVisual->SetContent(pSurface);
}

if (SUCCEEDED(hr))
{
    hr = m_pCompTarget->SetRoot(pVisual);
}

Paso 4: Crear un objeto de animación y un objeto de transformación de escala

Use el método IDCompositionDevice::CreateAnimation para crear un objeto de animación y el método IDCompositionDevice::CreateScaleTransform para crear un objeto de transformación de escala.

IDCompositionAnimation *pAnimateScale = NULL;
IDCompositionScaleTransform *pScale = NULL;

if (SUCCEEDED(hr))
{
    hr = m_pDevice->CreateAnimation(&pAnimateScale);
}

if (SUCCEEDED(hr))
{
    // Create the scale transform object.
    hr = m_pDevice->CreateScaleTransform(&pScale);
}

Paso 5: Compilación de la función de animación

Utilice los métodos de la interfaz IDCompositionAnimation del objeto de animación para crear una función de animación.

En el ejemplo siguiente se crea una función de animación simple que consta de un segmento polinómico cúbico y un segmento final.

pAnimateScale->AddCubic(
    0.0f,  // offset from beginning of animation function, in seconds
    0.0f,  // constant coefficient  
    1.0f,  // linear coefficient
    0.0f,  // quadratic coefficient
    0.0f); // cubic coefficient
pAnimateScale->End(1.0f, 1.0f);

Paso 6: Aplicar el objeto de animación a las propiedades del objeto de transformación de escala

Use los métodos IDCompositionScale::SetScaleX y SetScaleY para aplicar el objeto de animación a las propiedades ScaleX y ScaleY del objeto de transformación de escala.

// Find the center of the child window.
RECT rcChild = { };
GetClientRect(m_hwndLayeredChild, &rcChild);
float centerX = rcChild.right / 2.0f;
float centerY = rcChild.bottom / 2.0f;

// Scale from the center point of the child window's bitmap.
pScale->SetCenterX(centerX);
pScale->SetCenterY(centerY);

// Use the same animation object to animate the X and Y scale
// factors.
pScale->SetScaleX(pAnimateScale);
pScale->SetScaleY(pAnimateScale);

Paso 7: Aplicar el objeto de transformación de escala a la propiedad transform del objeto visual

Use el método IDCompositionVisual::SetTransform para aplicar el objeto de transformación de escala a la propiedad Transform del objeto visual.

hr = pVisual->SetTransform(pScale);

Paso 8: Ocultar la ventana secundaria superpuesta

Antes de confirmar la animación, use la función DwmSetWindowAttribute con la marca DWMWA_CLOAK para "ocultar" la ventana secundaria superpuesta. El ocultamiento quita la ventana secundaria superpuesta de la vista mientras la versión animada de la vista de mapa de bits de la ventana se representa en la pantalla.

BOOL fCloak = TRUE;
DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
    DWMWA_CLOAK,
    &fCloak,
    sizeof(fCloak));

Paso 9: Confirmación de la composición

Use el método IDCompositionDevice::Commit para confirmar el lote de comandos en Microsoft DirectComposition para su procesamiento. La animación aparecerá en la ventana de destino.

Paso 10: Desencerrar la ventana secundaria superpuesta

Una vez finalizada la animación, use la función DwmSetWindowAttribute con la marca DWMWA_CLOAK para quitar la ventana secundaria superpuesta.

Paso 11: Liberar objetos DirectComposition

Asegúrese de liberar todos los objetos DirectComposition cuando ya no los necesite. En el ejemplo siguiente se llama a la macro SafeRelease definida por la aplicación para liberar los objetos DirectComposition.

SafeRelease(&pVisual);
SafeRelease(&pAnimateScale);
SafeRelease(&pScale);


SafeRelease(&m_pDevice);
SafeRelease(&m_pCompTarget);

Ejemplo completo

//
// AnimateLayeredChildWindow.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>
#include <wincodec.h>

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

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

// Direct2D Header Files
#include <d2d1.h>
#include <d2d1helper.h>

// Desktop Window Manager (DWM) Header File
#include <dwmapi.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 InitializeMainWindow();
    HRESULT InitializeLayeredChildWindow();

    void RunMessageLoop();

private:
    HRESULT InitializeDirectCompositionObjects();

    HRESULT CreateDeviceIndependentResources();
    HRESULT CreateDeviceResources();
    void DiscardDeviceResources();

    HRESULT OnChildClick();
    HRESULT OnChildRender();

    HRESULT LoadResourceD2DBitmap(
        ID2D1RenderTarget *pRenderTarget,
        IWICImagingFactory *pIWICFactory,
        PCWSTR resourceName,
        PCWSTR resourceType,
        ID2D1Bitmap **ppBitmap
        );

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

    static LRESULT CALLBACK ChildWndProc(
        HWND hWnd,
        UINT message,
        WPARAM wParam,
        LPARAM lParam
        );
    
 private:
    int m_dpiX;
    int m_dpiY;
    int m_childOffsetX;
    int m_childOffsetY;

    HWND m_hwndMain;
    HWND m_hwndLayeredChild;

    IDCompositionDevice *m_pDevice;
    IDCompositionTarget *m_pCompTarget;
    ID2D1HwndRenderTarget *m_pRenderTarget;
    ID2D1Factory *m_pD2DFactory;
    ID2D1Bitmap *m_pBitmap;
    IWICImagingFactory *m_pWICFactory;

 };


//
// AnimateLayeredChildWindow.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: Click the thumnail image to animate the transition
//   of the child window from thumbsize to fullsize. Click the child
//   window again to reset.

#include "AnimateLayeredChildWindow.h"

#define TIMER_ID 100

/******************************************************************
*                                                                 *
*  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.InitializeMainWindow()) && SUCCEEDED(app.InitializeLayeredChildWindow()))
            {
                app.RunMessageLoop();
            }
        }
        CoUninitialize();
    }

    return 0;
}

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

DemoApp::DemoApp() :
    m_dpiX(0),
    m_dpiY(0),
    m_childOffsetX(20),
    m_childOffsetY(40),
    m_hwndMain(NULL),
    m_hwndLayeredChild(NULL),
    m_pDevice(NULL),
    m_pCompTarget(NULL),
    m_pRenderTarget(NULL),
    m_pBitmap(NULL),
    m_pD2DFactory(NULL),
    m_pWICFactory(NULL)
{
}

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

DemoApp::~DemoApp()
{
    SafeRelease(&m_pDevice);
    SafeRelease(&m_pCompTarget);
    SafeRelease(&m_pRenderTarget);
    SafeRelease(&m_pBitmap),
    SafeRelease(&m_pD2DFactory);
    SafeRelease(&m_pWICFactory);
}

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

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

    // Initialize device-independent resources, such 
    // as the Direct2D factory.
    hr = CreateDeviceIndependentResources();
    if (SUCCEEDED(hr))
    {
        // Register the main window class.
        WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
        wcex.style         = 0;
        wcex.lpfnWndProc   = DemoApp::MainWndProc;
        wcex.cbClsExtra    = 0;
        wcex.cbWndExtra    = sizeof(LONG_PTR);
        wcex.hInstance     = HINST_THISCOMPONENT;
        wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
        wcex.lpszMenuName  = NULL;
        wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
        wcex.lpszClassName = L"DirectCompDemoApp";

        RegisterClassEx(&wcex);

        RECT rect = { };
        SetRect(&rect, 0, 0, 640, 480);
        AdjustWindowRect(&rect, WS_OVERLAPPED | WS_SYSMENU, FALSE); 

        // Create the main application window.
        //

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

        float width = static_cast<float>(rect.right - rect.left);
        float height = static_cast<float>(rect.bottom - rect.top);

        m_hwndMain = CreateWindow(
            L"DirectCompDemoApp",
            L"DirectComposition Demo Application",
            WS_OVERLAPPED | WS_SYSMENU,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            static_cast<UINT>(ceil(width * m_dpiX / 96.f)),
            static_cast<UINT>(ceil(height * m_dpiY / 96.f)),
            NULL,
            NULL,
            HINST_THISCOMPONENT,
            this
            );
    }

    hr = m_hwndMain ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Create and initialize the DirectCompositoin objects.
        hr =  InitializeDirectCompositionObjects();
    }

    if (SUCCEEDED(hr))
    {
        ShowWindow(m_hwndMain, SW_SHOWNORMAL);
        UpdateWindow(m_hwndMain);
    }
  
    return hr;
}

/*******************************************************************
*                                                                  *
* Create the layered child window.                                 *
*                                                                  *
/******************************************************************/

HRESULT DemoApp::InitializeLayeredChildWindow()
{
    int thumbWidth = 48;
    int thumbHeight = 32;

    HRESULT hr = S_OK;

    WNDCLASSEXW wcex;
    wcex.cbSize         = sizeof(wcex);
    wcex.style          = 0;
    wcex.lpfnWndProc    = DemoApp::ChildWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = HINST_THISCOMPONENT;
    wcex.hIcon          = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH) GetStockObject (GRAY_BRUSH);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = L"DCompLayeredChildWindow";
    wcex.hIconSm        = NULL;
    
    if (!RegisterClassExW(&wcex))
    {
        return FALSE;
    }

    m_hwndLayeredChild = CreateWindowEx(WS_EX_LAYERED,
        L"DCompLayeredChildWindow",
        NULL,
        WS_CHILD | WS_CLIPSIBLINGS,
        0,
        0,
        static_cast<UINT>(ceil(640.0f * m_dpiX / 96.0f)),
        static_cast<UINT>(ceil(480.0f * m_dpiY / 96.0f)),
        m_hwndMain,
        NULL,
        HINST_THISCOMPONENT,
        this);

    hr = m_hwndLayeredChild ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Set the opacity and transparency color key of the layered 
        // child window.
        if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    if (SUCCEEDED(hr))
    {
        // While the child window is fullsize, load the bitmap resource and
        // render it to the child window.  
        hr = CreateDeviceResources(); 
    }
    
    if (SUCCEEDED(hr))
    {
        // Reduce the window to thumbsize.
        MoveWindow(m_hwndLayeredChild, m_childOffsetX, m_childOffsetY, 
            thumbWidth, thumbHeight, TRUE);
        ShowWindow(m_hwndLayeredChild, SW_SHOWNORMAL);
        UpdateWindow(m_hwndLayeredChild);
    }

    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::InitializeDirectCompositionObjects()
{
    HRESULT hr = S_OK;

    // Create a DirectComposition device object. 
    hr = DCompositionCreateDevice(nullptr, __uuidof(IDCompositionDevice), 
        reinterpret_cast<void**>(&m_pDevice));

    if (SUCCEEDED(hr))
    {
        // Create the composition target object.
        hr = m_pDevice->CreateTargetForHwnd(m_hwndMain, TRUE, &m_pCompTarget);   
    }

    return hr;
}


/******************************************************************
*                                                                 *
*  This method is used to create resources which are not bound    *
*  to any device. Their lifetime effectively extends for the      *
*  duration of the app.                                           *
*                                                                 *
******************************************************************/

HRESULT DemoApp::CreateDeviceIndependentResources()
{
    HRESULT hr = CoCreateInstance(
        CLSID_WICImagingFactory,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_PPV_ARGS(&m_pWICFactory)
        );

    if (SUCCEEDED(hr))
    {
        // Create a Direct2D factory.
        hr = D2D1CreateFactory(
            D2D1_FACTORY_TYPE_SINGLE_THREADED,
            &m_pD2DFactory
            );
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  This method creates the D2D bitmap that the application gives  *
*  to DirectComposition to be composed.                           *
*                                                                 *
******************************************************************/

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

    RECT rc;
    GetClientRect(m_hwndLayeredChild, &rc);

    D2D1_SIZE_U size = D2D1::SizeU(
        rc.right - rc.left,
        rc.bottom - rc.top
        );

    // Create a Direct2D render target.
    hr = m_pD2DFactory->CreateHwndRenderTarget(
        D2D1::RenderTargetProperties(),
        D2D1::HwndRenderTargetProperties(m_hwndLayeredChild, size),
        &m_pRenderTarget
        );

    if (SUCCEEDED(hr))
    {
        hr = LoadResourceD2DBitmap(
            m_pRenderTarget,
            m_pWICFactory,
            L"WhiteFlowers",
            L"Image",
            &m_pBitmap
            );
    }

    return hr;
}

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

void DemoApp::DiscardDeviceResources()
{
    SafeRelease(&m_pRenderTarget);
    SafeRelease(&m_pBitmap);
}

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

void DemoApp::RunMessageLoop()
{
    MSG msg;

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

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

LRESULT CALLBACK DemoApp::MainWndProc(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_DISPLAYCHANGE:
                {
                    InvalidateRect(hwnd, NULL, FALSE);
                }
                wasHandled = true;
                result = 0;
                break;

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

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

    return result;
}

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

LRESULT CALLBACK DemoApp::ChildWndProc(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_PAINT:
                {
                    pDemoApp->OnChildRender();
                    ValidateRect(hwnd, NULL);
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_LBUTTONDOWN:
                {
                    HRESULT hr = S_OK;
                    static BOOL fThumbsize = TRUE;

                    // If the child window is already fullsize, reset
                    // the visual tree and return the child window
                    // to thumbsize and move it to its initial location.
                    if (!fThumbsize)
                    {
                        pDemoApp->m_pCompTarget->SetRoot(NULL);
                        hr = pDemoApp->m_pDevice->Commit();  

                        MoveWindow(pDemoApp->m_hwndLayeredChild, 
                            pDemoApp->m_childOffsetX, 
                            pDemoApp->m_childOffsetY, 48, 32, TRUE);

                        pDemoApp->OnChildRender();
                    }   
                    else
                    {
                        // Cloak the child window.
                        BOOL fCloak = TRUE;
                        DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
                            DWMWA_CLOAK,
                            &fCloak,
                            sizeof(fCloak));

                        pDemoApp->OnChildClick();
                    }                    
                    fThumbsize = !fThumbsize;
                }
                wasHandled = true;
                result = 0;
                break;

            case WM_TIMER:
                {
                    // Uncloak the child window.
                    BOOL fCloak = FALSE;
                    DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
                        DWMWA_CLOAK,
                        &fCloak,
                        sizeof(fCloak)); 
                    KillTimer(pDemoApp->m_hwndLayeredChild, TIMER_ID);
                }
                wasHandled = true;
                result = 0;
                break;
            }
        }

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

    return result;
}


/******************************************************************
*                                                                 *
*  Draws a bitmap in the layered child window.                    *
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnChildRender()
{
    HRESULT hr = S_OK;
 
    // Retrieve the size of the render target.
    D2D1_SIZE_F size = m_pRenderTarget->GetSize();
    
    m_pRenderTarget->BeginDraw();
    
    // Draw a bitmap scaled to fill the window.
    m_pRenderTarget->DrawBitmap(
        m_pBitmap,
        D2D1::RectF(0.0f, 0.0f, size.width, size.height)
        );

    hr = m_pRenderTarget->EndDraw();

    if (hr == D2DERR_RECREATE_TARGET)
    {
        hr = S_OK;
        DiscardDeviceResources();
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  Handles a mouse click in the layered child window by animating *
*  the transition from a thumbsize window to a fullsize window.   *
*                                                                 *
******************************************************************/

HRESULT DemoApp::OnChildClick()
{
    int fullWidth = 640;
    int fullHeight = 480;
    HRESULT hr = S_OK;

    IDCompositionVisual *pVisual = nullptr;
    IUnknown* pSurface    = nullptr;

    hr = m_pDevice->CreateVisual(&pVisual);
    if (SUCCEEDED(hr))
    {
        hr = m_pDevice->CreateSurfaceFromHwnd(m_hwndLayeredChild, &pSurface);
    }

    if (SUCCEEDED(hr))
    {
        hr = pVisual->SetContent(pSurface);
    }

    if (SUCCEEDED(hr))
    {
        hr = m_pCompTarget->SetRoot(pVisual);
    }

    if (SUCCEEDED(hr))
    {
       // Position the visual at the same location as the
       // the child window.
        hr = pVisual->SetOffsetX(static_cast<float>(m_childOffsetX));
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(static_cast<float>(m_childOffsetY));  
        }
    }


    IDCompositionAnimation *pAnimateX = NULL;
    IDCompositionAnimation *pAnimateY = NULL;

    if (SUCCEEDED(hr))
    {
        // Create the animation objects.
        hr = m_pDevice->CreateAnimation(&pAnimateX);
        if (SUCCEEDED(hr))
        {
            hr = m_pDevice->CreateAnimation(&pAnimateY);
        }
    }

    IDCompositionAnimation *pAnimateScale = NULL;
    IDCompositionScaleTransform *pScale = NULL;

    if (SUCCEEDED(hr))
    {
        hr = m_pDevice->CreateAnimation(&pAnimateScale);
    }

    if (SUCCEEDED(hr))
    {
        // Create the scale transform object.
        hr = m_pDevice->CreateScaleTransform(&pScale);
    }

    if (SUCCEEDED(hr))
    {
        // Calculate the X and Y offsets that will position the child window 
        // in the center of the main window&#39;s client area.
        RECT rcParent = { };
        RECT rcChild = { };
        GetClientRect(m_hwndMain, &rcParent);
        GetClientRect(m_hwndLayeredChild, &rcChild);
        float endValX = rcParent.right / 2.0f - rcChild.right / 2.0f;
        float endValY = rcParent.bottom / 2.0f - rcChild.bottom / 2.0f;
 
        // Build the animation functions that will move the visual to the 
        // center of the main window&#39;s client area.
        pAnimateX->AddCubic(0.0f, static_cast<float>(m_childOffsetX), 
            endValX - m_childOffsetX, 0.0f, 0.0f);
        pAnimateX->End(0.9f, endValX);

        pAnimateY->AddCubic(0.0f, static_cast<float>(m_childOffsetY), 
            endValY - m_childOffsetY, 0.0f, 0.0f);
        pAnimateY->End(0.9f, endValY);

        // Associate the animation objects with the offset properties of 
        // the visual.
        hr = pVisual->SetOffsetX(pAnimateX);
        if (SUCCEEDED(hr))
        {
            hr = pVisual->SetOffsetY(pAnimateY);
        }
    }

    if (SUCCEEDED(hr))
    {
        // Commit the visual tree.
        hr = m_pDevice->Commit();  

        // Give the animation a chance to run.
        Sleep(900);
    }

    if (SUCCEEDED(hr))
    {
        // Align the visual with the upper-left corner of the
        // parent window&#39;s client area.
        pVisual->SetOffsetX(0.0);
        pVisual->SetOffsetY(0.0);

        // Enlarge the child window to fill the main window.
        if (!MoveWindow(m_hwndLayeredChild, 0, 0, fullWidth, fullHeight, TRUE))
        {
            hr = HRESULT_FROM_WIN32(GetLastError());
        }
    }

    if (SUCCEEDED(hr))
    {
        // Add animation primitives that define the animation object function 
        // used to scale up the child window&#39;s bitmap.
        pAnimateScale->AddCubic(
            0.0f,  // offset from beginning of animation function, in seconds
            0.0f,  // constant coefficient  
            1.0f,  // linear coefficient
            0.0f,  // quadratic coefficient
            0.0f); // cubic coefficient
        pAnimateScale->End(1.0f, 1.0f);

        // Find the center of the child window.
        RECT rcChild = { };
        GetClientRect(m_hwndLayeredChild, &rcChild);
        float centerX = rcChild.right / 2.0f;
        float centerY = rcChild.bottom / 2.0f;

        // Scale from the center point of the child window&#39;s bitmap.
        pScale->SetCenterX(centerX);
        pScale->SetCenterY(centerY);

        // Use the same animation object to animate the X and Y scale
        // factors.
        pScale->SetScaleX(pAnimateScale);
        pScale->SetScaleY(pAnimateScale);

        // Set the Transform property of the visual to use the scale 
        // transform.
        hr = pVisual->SetTransform(pScale);
    }
    
    if (SUCCEEDED(hr))
    {   // Commit the visual tree.
        hr = m_pDevice->Commit();  

        // Use a WM_TIMER message in the child window procedure 
        // to uncloak the child window. 
        SetTimer(m_hwndLayeredChild, TIMER_ID, 1000, NULL);
    }

    SafeRelease(&pAnimateX);
    SafeRelease(&pAnimateY);
    SafeRelease(&pVisual);
    SafeRelease(&pAnimateScale);
    SafeRelease(&pScale);
    
    return hr;
}


/******************************************************************
*                                                                 *
*  This method will create a Direct2D bitmap from an application  *
*  resource.                                                      *
*                                                                 *
******************************************************************/

HRESULT DemoApp::LoadResourceD2DBitmap(
    ID2D1RenderTarget *pRenderTarget,
    IWICImagingFactory *pIWICFactory,
    PCWSTR resourceName,
    PCWSTR resourceType,
    ID2D1Bitmap **ppBitmap
    )
{
    HRESULT hr = S_OK;
    IWICBitmapDecoder *pDecoder = NULL;
    IWICBitmapFrameDecode *pSource = NULL;
    IWICStream *pStream = NULL;
    IWICFormatConverter *pConverter = NULL;

    HRSRC imageResHandle = NULL;
    HGLOBAL imageResDataHandle = NULL;
    void *pImageFile = NULL;
    DWORD imageFileSize = 0;

    // Locate the resource.
    imageResHandle = FindResourceW(HINST_THISCOMPONENT, resourceName, resourceType);

    hr = imageResHandle ? S_OK : E_FAIL;
    if (SUCCEEDED(hr))
    {
        // Load the resource.
        imageResDataHandle = LoadResource(HINST_THISCOMPONENT, imageResHandle);

        hr = imageResDataHandle ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Lock it to get a system memory pointer.
        pImageFile = LockResource(imageResDataHandle);

        hr = pImageFile ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Calculate the size.
        imageFileSize = SizeofResource(HINST_THISCOMPONENT, imageResHandle);

        hr = imageFileSize ? S_OK : E_FAIL;
    }

    if (SUCCEEDED(hr))
    {
        // Create a WIC stream to map onto the memory.
        hr = pIWICFactory->CreateStream(&pStream);
    }

    if (SUCCEEDED(hr))
    {
        // Initialize the stream with the memory pointer and size.
        hr = pStream->InitializeFromMemory(
            reinterpret_cast<BYTE*>(pImageFile),
            imageFileSize
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create a decoder for the stream.
        hr = pIWICFactory->CreateDecoderFromStream(
            pStream,
            NULL,
            WICDecodeMetadataCacheOnLoad,
            &pDecoder
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create the initial frame.
        hr = pDecoder->GetFrame(0, &pSource);
    }

    if (SUCCEEDED(hr))
    {
        // Convert the image format to 32bppPBGRA
        // (DXGI_FORMAT_B8G8R8A8_UNORM + D2D1_ALPHA_MODE_PREMULTIPLIED).
        hr = pIWICFactory->CreateFormatConverter(&pConverter);
    }

    if (SUCCEEDED(hr))
    {
        hr = pConverter->Initialize(
            pSource,
            GUID_WICPixelFormat32bppPBGRA,
            WICBitmapDitherTypeNone,
            NULL,
            0.f,
            WICBitmapPaletteTypeMedianCut
            );
    }

    if (SUCCEEDED(hr))
    {
        // Create a Direct2D bitmap from the WIC bitmap.
        hr = pRenderTarget->CreateBitmapFromWicBitmap(
            pConverter,
            NULL,
            ppBitmap
            );
    }

    SafeRelease(&pDecoder);
    SafeRelease(&pSource);
    SafeRelease(&pStream);
    SafeRelease(&pConverter);

    return hr;
}

Animación

Objetos de mapa de bits

Ejemplo de ventana secundaria superpuesta DirectComposition