Comment appliquer des effets
Notes
Pour les applications sur Windows 10, nous vous recommandons d’utiliser Windows. UI. API de composition au lieu de DirectComposition. Pour plus d’informations, consultez Moderniser votre application de bureau à l’aide de la couche Visuel.
Cette rubrique montre comment utiliser Microsoft DirectComposition pour appliquer des effets et des transformations 3D à un visuel. L’exemple de cette rubrique modifie l’opacité d’un visuel et la fait pivoter autour d’un axe vertical situé au centre du visuel. Pour en savoir plus sur les autres effets pris en charge par DirectComposition, consultez Effets.
Bon à savoir
Technologies
Prérequis
- C/C++
- Microsoft Win32
- COM (Component Object Model)
Instructions
Étape 1 : Initialiser des objets DirectComposition
- Créez l’objet appareil et l’objet cible de composition.
- Créez un visuel, définissez son contenu et ajoutez-le à l’arborescence visuelle.
Pour plus d’informations, consultez Comment initialiser DirectComposition.
Étape 2 : Créer un objet de transformation de rotation 3D, un objet de groupe d’effets et un objet d’animation
Utilisez la méthode IDCompositionDevice::CreateRotateTransform3D pour créer un objet de transformation de rotation 3D et la méthode CreateEffectGroup pour créer un objet de groupe d’effets. Cet exemple utilise également la méthode CreateAnimation pour créer un objet d’animation pour animer la transformation de rotation 3D. Pour en savoir plus sur l’application d’animations, consultez Comment appliquer des animations.
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);
}
Étape 3 : Définir la fonction d’animation
Utilisez les méthodes de l’objet IDCompositionAnimation pour définir la fonction d’animation.
L’exemple suivant définit une fonction d’animation simple. Lorsqu’elle est appliquée à une propriété d’objet, la fonction d’animation modifie de façon incrémentielle la valeur de la propriété de 0 à la valeur de l’argument degrés au cours d’une seconde.
if (SUCCEEDED(hr))
{
// Define the animation function.
pAnimation->AddCubic(0.0f, 0.0f, degrees, 0.0f, 0.0f);
pAnimation->End(1.0f, degrees);
Étape 4 : Définir les propriétés de la transformation de rotation 3D
- Appliquez la fonction d’animation à la propriété Angle de la transformation de rotation 3D en appelant la méthode IDCompositionRotateTransform3D::SetAngle .
- Définissez l’axe de rotation pour la transformation de rotation 3D en appelant les méthodes IDCompositionRotateTransform3D::SetAxisX, SetAxisY et SetAxisZ .
- Définissez le centre de rotation de la transformation de rotation 3D en appelant les méthodes IDCompositionRotateTransform3D::SetCenterX et SetCenterY .
L’exemple suivant configure une transformation de rotation 3D pour l’épinglage d’un visuel autour d’un axe vertical situé au centre du visuel. Les paramètres m_bitmapWidth et m_bitmapHeight sont la largeur et la hauteur de la bitmap, en pixels.
// 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);
}
Étape 5 : Définir les propriétés de l’objet de groupe d’effets
- Appliquez l’objet de transformation de rotation 3D à la propriété Transform3D de l’objet de groupe d’effets en appelant la méthode IDCompositionEffectGroup::SetTransform3D .
- Définissez la propriété Opacity de l’objet de groupe d’effets en appelant l’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);
}
Étape 6 : Appliquer l’objet de groupe d’effets à la propriété Effect du visuel
Appelez la méthode IDCompositionVisual::SetEffect pour appliquer l’objet de groupe d’effets au visuel.
if (SUCCEEDED(hr))
{
// Apply the effect group object to the Effect property of the visual.
hr = pVisual->SetEffect(pEffectGroup);
}
Étape 7 : Valider la composition
Appelez la méthode IDCompositionDevice::Commit pour valider le lot de commandes dans DirectComposition pour traitement. La composition résultante s’affiche dans la fenêtre cible.
if (SUCCEEDED(hr))
{
// Commit the visual to DirectComposition.
hr = m_pDevice->Commit();
}
Étape 8 : Libérer les objets DirectComposition
Veillez à libérer l’objet d’animation, l’objet de transformation de rotation 3D et l’objet de groupe d’effets lorsque vous n’en avez plus besoin. L’exemple suivant appelle la macro SafeRelease définie par l’application pour libérer les objets.
// Release the DirectComposition objects.
SafeRelease(&pAnimation);
SafeRelease(&pRotate3D);
SafeRelease(&pEffectGroup);
N’oubliez pas non plus de libérer l’objet appareil, l’objet cible de composition et le visuel avant la fermeture de votre application. Pour plus d’informations, consultez Comment initialiser DirectComposition.
Exemple complet
//
// 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;
}
Rubriques connexes
Commentaires
Bientôt disponible : Tout au long de 2024, nous allons supprimer progressivement GitHub Issues comme mécanisme de commentaires pour le contenu et le remplacer par un nouveau système de commentaires. Pour plus d’informations, consultez https://aka.ms/ContentUserFeedback.
Envoyer et afficher des commentaires pour