如何对分层子窗口的位图进行动画处理
注意
对于 Windows 10 上的应用，建议使用 Windows.UI.Composition API 而不是 DirectComposition。 有关详细信息，请参阅 使用视觉对象层实现桌面应用的现代化。
本主题介绍如何创建使用分层子窗口的位图作为视觉对象的内容的视觉对象并创建动画。 本主题中所述的示例使用动画缩放转换将子窗口的位图从拇指大小“增大”到完整大小。 有关分层窗口的详细信息，请参阅 窗口位图。
需要了解的事项
技术
先决条件
- C/C++
- Microsoft Win32
- 组件对象模型 (COM)
Instructions
步骤 1：创建分层子窗口
使用以下步骤创建分层子窗口。
- 注册子窗口类并创建具有 WS_EX_LAYERED样式的 子窗口。 在以下示例中，
m_dpiX和m_dpiY指定屏幕分辨率（以每逻辑英寸像素为单位），是m_hwndMainmain应用程序窗口的句柄。
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);
- 调用 SetLayeredWindowAttributes 函数可设置分层子窗口的透明度颜色键和不透明度。 以下代码将透明度颜色键设置为零，将不透明度设置为 255 (不透明) 。
if (!SetLayeredWindowAttributes(m_hwndLayeredChild, 0, 255, LWA_ALPHA))
{
hr = HRESULT_FROM_WIN32(GetLastError());
}
- 将一些内容呈现给子窗口。
步骤 2：初始化 DirectComposition 对象
创建设备对象和组合目标对象。 有关详细信息，请参阅 如何初始化 DirectComposition。
步骤 3：创建可视对象并将分层子窗口的位图设置为内容属性
使用以下步骤创建视觉对象，将其内容属性设置为使用分层子窗口的位图，然后将视觉对象添加到可视化树。
- 调用 IDCompositionDevice：：CreateVisual 来创建可视对象。
- 通过将子窗口的句柄传递给 CreateSurfaceFromHwnd 函数，为分层子窗口创建 Microsoft DirectComposition 图面。
- 调用视觉对象的 IDCompositionVisual：：SetContent 方法，将新图面设置为分层子窗口的视觉内容。
- 将视觉对象添加到可视化树。 若要将视觉对象添加到树的根目录，请调用 IDCompositionTarget：：SetRoot 方法。 若要将视觉对象添加为另一个视觉对象的子视觉对象，请使用父视觉对象的 IDCompositionVisual：：AddVisual 方法。
以下示例创建一个可视对象，将其 Content 属性设置为使用分层子窗口的位图，并将视觉对象添加到可视化树的根目录中。
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);
}
步骤 4：创建动画对象和缩放转换对象
使用 IDCompositionDevice：：CreateAnimation 方法创建动画对象，使用 IDCompositionDevice：：CreateScaleTransform 方法创建缩放转换对象。
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);
}
步骤 5：生成动画函数
使用动画对象的 IDCompositionAnimation 接口的方法生成动画函数。
以下示例生成一个简单的动画函数，该函数由一个立方多项式段和一个结束段组成。
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);
步骤 6：将动画对象应用于缩放转换对象的属性
使用 IDCompositionScale：：SetScaleX 和 SetScaleY 方法将动画对象应用于缩放转换对象的 ScaleX 和 ScaleY 属性。
// 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);
步骤 7：将缩放转换对象应用于视觉对象的 transform 属性
使用 IDCompositionVisual：：SetTransform 方法将缩放转换对象应用于视觉对象的 Transform 属性。
hr = pVisual->SetTransform(pScale);
步骤 8：遮盖分层子窗口
在提交动画之前，请使用带有 DWMWA_CLOAK 标志的 DwmSetWindowAttribute 函数来“隐藏”分层子窗口。 当窗口的位图视图的动画版本呈现到屏幕上时，隐藏将从视图中删除分层子窗口。
BOOL fCloak = TRUE;
DwmSetWindowAttribute(pDemoApp->m_hwndLayeredChild,
DWMWA_CLOAK,
&fCloak,
sizeof(fCloak));
步骤 9：提交合成
使用 IDCompositionDevice：：Commit 方法将命令批提交到 Microsoft DirectComposition 进行处理。 动画将显示在目标窗口中。
步骤 10：取消分层子窗口的遮盖
动画完成后，使用带有 DWMWA_CLOAK 标志的 DwmSetWindowAttribute 函数来取消分层子窗口的遮盖。
步骤 11：释放 DirectComposition 对象
当不再需要 DirectComposition 对象时，请务必释放它们。 以下示例调用应用程序定义的 SafeRelease 宏来释放 DirectComposition 对象。
SafeRelease(&pVisual);
SafeRelease(&pAnimateScale);
SafeRelease(&pScale);
SafeRelease(&m_pDevice);
SafeRelease(&m_pCompTarget);
完整示例
//
// 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's message loop. *
* *
******************************************************************/
void DemoApp::RunMessageLoop()
{
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
/******************************************************************
* *
* The main window'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'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'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'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'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'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'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;
}
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