Come applicare gli effetti
Nota
Per le app in Windows 10, è consigliabile usare le API Windows.UI.Composition anziché DirectComposition. Per altre info, vedi Modernizzare l'app desktop usando il livello visivo.
Questo argomento illustra come usare Microsoft DirectComposition per applicare effetti e trasformazioni 3D a un oggetto visivo. L'esempio in questo argomento modifica l'opacità di un oggetto visivo e la ruota attorno a un asse verticale posizionato al centro dell'oggetto visivo. Per altre informazioni sugli altri effetti supportati da DirectComposition, vedere Effetti.
Informazioni importanti
Tecnologie
Prerequisiti
- C/C++
- Microsoft Win32
- Component Object Model (COM)
Istruzioni
Passaggio 1: Inizializzare oggetti DirectComposition
- Creare l'oggetto dispositivo e l'oggetto di destinazione della composizione.
- Creare un oggetto visivo, impostarne il contenuto e aggiungerlo alla struttura ad albero visuale.
Per altre informazioni, vedere Come inizializzare DirectComposition.
Passaggio 2: Creare un oggetto trasformazione ruota 3D, un oggetto gruppo di effetti e un oggetto animazione
Utilizzare il metodo IDCompositionDevice::CreateRotateTransform3D per creare un oggetto di trasformazione ruota 3D e il metodo CreateEffectGroup per creare un oggetto gruppo di effetti. Questo esempio usa anche il metodo CreateAnimation per creare un oggetto animazione per animare la trasformazione ruota 3D. Per altre informazioni sull'applicazione di animazioni, vedi Come applicare le animazioni.
HRESULT hr = S_OK;
IDCompositionAnimation *pAnimation = nullptr;
IDCompositionRotateTransform3D *pRotate3D = nullptr;
IDCompositionEffectGroup *pEffectGroup = nullptr;
// Create a 3D rotate transform object.
hr = m_pDevice->CreateRotateTransform3D(&pRotate3D);
if (SUCCEEDED(hr))
{
// Create an effect group object.
hr = m_pDevice->CreateEffectGroup(&pEffectGroup);
}
if (SUCCEEDED(hr))
{
// Create an animation object.
hr = m_pDevice->CreateAnimation(&pAnimation);
}
Passaggio 3: Definire la funzione di animazione
Utilizzare i metodi dell'oggetto IDCompositionAnimation per definire la funzione di animazione.
L'esempio seguente definisce una funzione di animazione semplice. Se applicato a una proprietà dell'oggetto, la funzione di animazione modifica in modo incrementale il valore della proprietà da 0 al valore dell'argomento gradi nel corso di un secondo.
if (SUCCEEDED(hr))
{
// Define the animation function.
pAnimation->AddCubic(0.0f, 0.0f, degrees, 0.0f, 0.0f);
pAnimation->End(1.0f, degrees);
Passaggio 4: Impostare le proprietà della trasformazione di rotazione 3D
- Applicare la funzione di animazione alla proprietà Angle della trasformazione ruota 3D chiamando il metodo IDCompositionRotateTransform3D::SetAngle .
- Impostare l'asse di rotazione per la trasformazione di rotazione 3D chiamando i metodi IDCompositionRotateTransform3D::SetAxisX, SetAxisY e SetAxisZ .
- Impostare il centro di rotazione per la trasformazione ruota 3D chiamando i metodi IDCompositionRotateTransform3D::SetCenterX e SetCenterY .
Nell'esempio seguente viene impostata una trasformazione di rotazione 3D per ruotare un oggetto visivo attorno a un asse verticale posizionato al centro dell'oggetto visivo. I parametri m_bitmapWidth e m_bitmapHeight sono la larghezza e l'altezza della bitmap, in pixel.
// Set the properties of the rotate transform object.
//
// Apply the animation object to the Angle property so that
// the visual will appear to spin around an axis.
pRotate3D->SetAngle(pAnimation);
// Set a vertical axis through the center of the visual's bitmap.
pRotate3D->SetAxisX(0.0f);
pRotate3D->SetAxisY(1.0f);
pRotate3D->SetAxisZ(0.0f);
// Set the center of rotation to the center of the visual's bitmap.
pRotate3D->SetCenterX(m_bitmapWidth / 2.0f);
pRotate3D->SetCenterY(m_bitmapHeight / 2.0f);
}
Passaggio 5: Impostare le proprietà dell'oggetto gruppo di effetti
- Applicare l'oggetto trasformazione ruota 3D alla proprietà Transform3D dell'oggetto gruppo di effetti chiamando il metodo IDCompositionEffectGroup::SetTransform3D .
- Impostare la proprietà Opacity dell'oggetto gruppo di effetti chiamando IDCompositionEffectGroup::SetOpacity.
if (SUCCEEDED(hr))
{
// Apply the rotate transform object to the Tranform3D property
// of the effect group object.
hr = pEffectGroup->SetTransform3D(pRotate3D);
}
if (SUCCEEDED(hr))
{
// Set the Opacity of the effect group object.
hr = pEffectGroup->SetOpacity(opacity);
}
Passaggio 6: Applicare l'oggetto gruppo di effetti alla proprietà Effect dell'oggetto visivo
Chiamare il metodo IDCompositionVisual::SetEffect per applicare l'oggetto gruppo di effetti all'oggetto visivo.
if (SUCCEEDED(hr))
{
// Apply the effect group object to the Effect property of the visual.
hr = pVisual->SetEffect(pEffectGroup);
}
Passaggio 7: Eseguire il commit della composizione
Chiamare il metodo IDCompositionDevice::Commit per eseguire il commit del batch di comandi in DirectComposition per l'elaborazione. La composizione risultante viene visualizzata nella finestra di destinazione.
if (SUCCEEDED(hr))
{
// Commit the visual to DirectComposition.
hr = m_pDevice->Commit();
}
Passaggio 8: Liberare gli oggetti DirectComposition
Assicurarsi di liberare l'oggetto animazione, l'oggetto trasformazione ruota 3D e l'oggetto gruppo di effetti quando non sono più necessari. Nell'esempio seguente viene chiamata la macro SafeRelease definita dall'applicazione per liberare gli oggetti.
// Release the DirectComposition objects.
SafeRelease(&pAnimation);
SafeRelease(&pRotate3D);
SafeRelease(&pEffectGroup);
Ricordarsi anche di liberare l'oggetto dispositivo, l'oggetto di destinazione della composizione e l'oggetto visivo prima dell'uscita dall'applicazione. Per altre informazioni, vedere Come inizializzare DirectComposition.
Esempio completo
//
// ApplyEffects.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.
// Refer to MSDN for the latest info on corresponding values for different platforms.
#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 and Direct3D Header Files
#include <dcomp.h>
#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 OnPaint();
HRESULT OnClientClick(int xPos, int yPos);
HRESULT OnMouseMove(int xPos, int yPos);
HRESULT LoadResourceGDIBitmap(
PCWSTR resourceName,
HBITMAP &hbmp
);
HRESULT MyCreateGDIRenderedDCompSurface(HBITMAP hBitmap,
IDCompositionSurface **ppSurface);
HRESULT SetVisualOpacity(IDCompositionVisual *pVisual, float opacity);
HRESULT RotateVisual(IDCompositionVisual *pVisual,float degrees);
static LRESULT CALLBACK WndProc(
HWND hWnd,
UINT message,
WPARAM wParam,
LPARAM lParam
);
private:
HWND m_hwnd;
HBITMAP m_hBitmap;
int m_bitmapWidth;
int m_bitmapHeight;
ID3D11Device *m_pD3D11Device;
IDCompositionDevice *m_pDevice;
IDCompositionTarget *m_pCompTarget;
IDCompositionVisual *m_pVisual;
};
//
// ApplyEffects.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: Hover over the image to see the opacity change. Click
// the image to apply a 3D rotation.
#include "ApplyEffects.h"
#define OFFSET_X 20
#define OFFSET_Y 20
#define TRANSPARENT 0.5
#define OPAQUE 1.0
/******************************************************************
* *
* 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_pDevice(nullptr),
m_pCompTarget(nullptr),
m_pD3D11Device(nullptr),
m_pVisual(nullptr),
m_bitmapHeight(0),
m_bitmapWidth(0)
{
}
/******************************************************************
* *
* Release resources. *
* *
******************************************************************/
DemoApp::~DemoApp()
{
SafeRelease(&m_pDevice);
SafeRelease(&m_pCompTarget);
SafeRelease(&m_pD3D11Device);
SafeRelease(&m_pVisual);
}
/*******************************************************************
* *
* 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 = NULL;
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))
{
// Initialize DirectComposition resources, such as the
// device object and composition target object.
hr = InitializeDirectCompositionDevice();
}
if (SUCCEEDED(hr))
{
hr = CreateResources();
}
if (SUCCEEDED(hr))
{
ShowWindow(m_hwnd, SW_SHOWNORMAL);
UpdateWindow(m_hwnd);
}
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.
D3D11CreateDevice(
nullptr,
D3D_DRIVER_TYPE_HARDWARE,
NULL,
D3D11_CREATE_DEVICE_BGRA_SUPPORT,
NULL,
0,
D3D11_SDK_VERSION,
&m_pD3D11Device,
&featureLevelSupported,
NULL);
IDXGIDevice *pDXGIDevice = nullptr;
hr = (m_pD3D11Device == nullptr) ? E_UNEXPECTED : S_OK;
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_pDevice));
}
if (SUCCEEDED(hr))
{
// Create the composition target object.
hr = m_pDevice->CreateTargetForHwnd(m_hwnd, TRUE, &m_pCompTarget);
}
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"Penguins", m_hBitmap);
return hr;
}
/******************************************************************
* *
* Discard device-specific resources. *
* *
******************************************************************/
void DemoApp::DiscardResources()
{
DeleteObject(m_hBitmap);
}
/******************************************************************
* *
* The main window's message loop. *
* *
******************************************************************/
void DemoApp::RunMessageLoop()
{
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
/******************************************************************
* *
* Called when the application's main window is painted. This *
* method builds a simple visual tree and passes it to *
* DirectComposition. *
* *
******************************************************************/
HRESULT DemoApp::OnPaint()
{
HRESULT hr = S_OK;
IDCompositionSurface *pSurface = nullptr;
// Create a visual object.
hr = m_pDevice->CreateVisual(&m_pVisual);
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 = m_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.
m_pVisual->SetOffsetX(OFFSET_X);
m_pVisual->SetOffsetY(OFFSET_Y);
hr = SetVisualOpacity(m_pVisual, TRANSPARENT);
}
if (SUCCEEDED(hr))
{
// Set the visual to be the root of the visual tree.
hr = m_pCompTarget->SetRoot(m_pVisual);
}
if (SUCCEEDED(hr))
{
// Commit the visual to be composed and displayed.
hr = m_pDevice->Commit();
}
return hr;
}
/******************************************************************
* *
* Called when the mouse moves in the main window's client area. *
* This method determines whether the mouse cursor is over the *
* visual, and calls an application-defined function to set the *
* visual's opacity. *
* *
******************************************************************/
HRESULT DemoApp::OnMouseMove(int xPos, int yPos)
{
HRESULT hr = S_OK;
static BOOL fOverImage = FALSE;
// Determine whether the cursor is over the visual.
if ((xPos >= OFFSET_X && xPos <= (OFFSET_X + m_bitmapWidth))
&& (yPos >= OFFSET_Y && yPos <= (OFFSET_Y + m_bitmapHeight)))
{
if (!fOverImage)
{
// The cursor has moved over the visual, so make the visual
// 100% opaque.
hr = SetVisualOpacity(m_pVisual, OPAQUE);
fOverImage = TRUE;
}
}
else if (fOverImage)
{
// The cursor has moved off the visual, so make the visual
// 50% opaque.
hr = SetVisualOpacity(m_pVisual, TRANSPARENT);
fOverImage = FALSE;
}
return hr;
}
/******************************************************************
* *
* Changes the opacity of a visual. *
* *
******************************************************************/
HRESULT DemoApp::SetVisualOpacity(IDCompositionVisual *pVisual, float opacity)
{
HRESULT hr = S_OK;
IDCompositionEffectGroup *pEffectGroup = nullptr;
// Validate the input arguments.
if (pVisual == NULL || (opacity > 1.0f || opacity < 0.0f))
return E_INVALIDARG;
// Create an effect group object.
hr = m_pDevice->CreateEffectGroup(&pEffectGroup);
if (SUCCEEDED(hr))
{
// Set the Opacity of the effect group object.
hr = pEffectGroup->SetOpacity(opacity);
}
if (SUCCEEDED(hr))
{
// Apply the effect group object to the Effect property of the visual.
hr = m_pVisual->SetEffect(pEffectGroup);
}
if (SUCCEEDED(hr))
{
// Commit the visual to DirectComposition.
hr = m_pDevice->Commit();
}
// Free the effect group object.
SafeRelease(&pEffectGroup);
return hr;
}
/******************************************************************
* *
* Called when the user clicks in the main window's client area. *
* This method determines whether the mouse cursor is over the *
* visual and calls an application-defined function to rotate the *
* visual. *
* *
******************************************************************/
HRESULT DemoApp::OnClientClick(int xPos, int yPos)
{
HRESULT hr = S_OK;
// Determine whether the mouse cursor is over the visual. If so,
// rotate the visual.
if ((xPos >= OFFSET_X && xPos <= (OFFSET_X + m_bitmapWidth))
&& (yPos >= OFFSET_Y && yPos <= (OFFSET_Y + m_bitmapHeight)))
{
hr = RotateVisual(m_pVisual, 360.0f);
}
return hr;
}
/******************************************************************
* *
* Performs an animated 3D rotation of a visual. *
* *
******************************************************************/
HRESULT DemoApp::RotateVisual(IDCompositionVisual *pVisual, float degrees)
{
HRESULT hr = S_OK;
IDCompositionAnimation *pAnimation = nullptr;
IDCompositionRotateTransform3D *pRotate3D = nullptr;
IDCompositionEffectGroup *pEffectGroup = nullptr;
// Validate the input arguments.
if (pVisual == NULL || (degrees > 360.0f || degrees < -360.0f))
return E_INVALIDARG;
// Create a 3D rotate transform object.
hr = m_pDevice->CreateRotateTransform3D(&pRotate3D);
if (SUCCEEDED(hr))
{
// Create an effect group object.
hr = m_pDevice->CreateEffectGroup(&pEffectGroup);
}
if (SUCCEEDED(hr))
{
// Create an animation object.
hr = m_pDevice->CreateAnimation(&pAnimation);
}
if (SUCCEEDED(hr))
{
// Define the animation function.
pAnimation->AddCubic(0.0f, 0.0f, degrees, 0.0f, 0.0f);
pAnimation->End(1.0f, degrees);
// Set the properties of the rotate transform object.
//
// Apply the animation object to the Angle property so that
// the visual will appear to spin around an axis.
pRotate3D->SetAngle(pAnimation);
// Set a vertical axis through the center of the visual's bitmap.
pRotate3D->SetAxisX(0.0f);
pRotate3D->SetAxisY(1.0f);
pRotate3D->SetAxisZ(0.0f);
// Set the center of rotation to the center of the visual's bitmap.
pRotate3D->SetCenterX(m_bitmapWidth / 2.0f);
pRotate3D->SetCenterY(m_bitmapHeight / 2.0f);
}
if (SUCCEEDED(hr))
{
// Apply the rotate transform object to the Tranform3D property
// of the effect group object.
hr = pEffectGroup->SetTransform3D(pRotate3D);
}
if (SUCCEEDED(hr))
{
// Apply the effect group object to the Effect property of the visual.
hr = pVisual->SetEffect(pEffectGroup);
}
if (SUCCEEDED(hr))
{
// Commit the visual to DirectComposition.
hr = m_pDevice->Commit();
}
// Release the DirectComposition objects.
SafeRelease(&pAnimation);
SafeRelease(&pRotate3D);
SafeRelease(&pEffectGroup);
return hr;
}
/******************************************************************
* *
* The window'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(LOWORD(lParam), HIWORD(lParam));
}
wasHandled = true;
result = 0;
break;
case WM_MOUSEMOVE:
{
pDemoApp->OnMouseMove(LOWORD(lParam), HIWORD(lParam));
}
wasHandled = true;
result = 0;
break;
case WM_PAINT:
{
pDemoApp->OnPaint();
ValidateRect(hwnd, NULL);
}
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;
}
// CreateGDIRenderedDCompSurface - 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 bmpSize = 0;
BITMAP bmp = { };
HBITMAP hBitmapOld = NULL;
HDC hSurfaceDC = NULL;
HDC hBitmapDC = NULL;
IDXGISurface1 *pDXGISurface = nullptr;
IDCompositionSurface *pDCSurface = nullptr;
POINT pointOffset = { };
hr = hBitmap ? S_OK : E_FAIL;
if (SUCCEEDED(hr))
{
// Get information about the bitmap.
bmpSize = GetObject(hBitmap, sizeof(BITMAP), &bmp);
}
hr = bmpSize ? S_OK : E_FAIL;
if (SUCCEEDED(hr))
{
// Save the bitmap dimensions.
m_bitmapWidth = bmp.bmWidth;
m_bitmapHeight = bmp.bmHeight;
// Create a DirectComposition-compatible surface that is the same size
// as the bitmap.
hr = m_pDevice->CreateSurface(m_bitmapWidth, m_bitmapHeight,
DXGI_FORMAT_B8G8R8A8_UNORM, DXGI_ALPHA_MODE_IGNORE, &pDCSurface);
}
hr = pDCSurface ? S_OK : E_FAIL;
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.
pDXGISurface->GetDC(FALSE, &hSurfaceDC);
}
hr = hSurfaceDC ? S_OK : E_FAIL;
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,
m_bitmapWidth, m_bitmapHeight, hBitmapDC, 0, 0, SRCCOPY);
if (hBitmapOld)
{
SelectObject(hBitmapDC, hBitmapOld);
}
DeleteDC(hBitmapDC);
}
pDXGISurface->ReleaseDC(NULL);
}
// End the rendering.
pDCSurface->EndDraw();
*ppSurface = pDCSurface;
SafeRelease(&pDXGISurface);
return hr;
}
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