Improve direct2d backing store implementation

Add a per-window swap chain to a QPlatformWindow subclass instead of tying
it to the backing store. This is needed to support native widgets (as
opposed to alien widgets).

Change the backing store to draw to an intermediate pixmap and flush to
the requested window by using the per-window swap chain. This also opens
the door for faster window presentation later on by using the swap chain
more intelligently.

Also add a changelog entry for the direct2d plugin, which was omitted
earlier.

[ChangeLog][QtGui][Windows]
Introduce experimental direct2d platform plugin for Windows. This plugin
shares most code with the current windows plugin, but substitutes a
direct2d-based paint engine for window backing stores and pixmaps.

Change-Id: I5f54e7e4c1fb15b1639bd26b712fb40ac141e4ac
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

7 files changed, 288 insertions, 166 deletions

diff --git a/src/plugins/platforms/direct2d/direct2d.pro b/src/plugins/platforms/direct2d/direct2d.pro
index 5a1e71b962..4f986b57d7 100644
--- a/src/plugins/platforms/direct2d/direct2d.pro
+++ b/src/plugins/platforms/direct2d/direct2d.pro
@@ -22,7 +22,8 @@ SOURCES += \
     qwindowsdirect2dintegration.cpp \
     qwindowsdirect2dplatformplugin.cpp \
     qwindowsdirect2ddevicecontext.cpp \
-    qwindowsdirect2dnativeinterface.cpp
+    qwindowsdirect2dnativeinterface.cpp \
+    qwindowsdirect2dwindow.cpp
 
 HEADERS += \
     qwindowsdirect2dpaintengine.h \
@@ -34,6 +35,7 @@ HEADERS += \
     qwindowsdirect2dbackingstore.h \
     qwindowsdirect2dintegration.h \
     qwindowsdirect2ddevicecontext.h \
-    qwindowsdirect2dnativeinterface.h
+    qwindowsdirect2dnativeinterface.h \
+    qwindowsdirect2dwindow.h
 
 OTHER_FILES += direct2d.json
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.cpp
index 379e75c26e..079ad6f127 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.cpp
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.cpp
@@ -45,108 +45,15 @@
 #include "qwindowsdirect2dpaintdevice.h"
 #include "qwindowsdirect2dbitmap.h"
 #include "qwindowsdirect2ddevicecontext.h"
+#include "qwindowsdirect2dwindow.h"
 
-#include "qwindowswindow.h"
 #include "qwindowscontext.h"
 
 #include <QtGui/QWindow>
 #include <QtCore/QDebug>
 
-#include <dxgi1_2.h>
-#include <d3d11.h>
-#include <wrl.h>
-
-using Microsoft::WRL::ComPtr;
-
 QT_BEGIN_NAMESPACE
 
-class QWindowsDirect2DBackingStorePrivate
-{
-public:
-    QWindowsDirect2DBackingStorePrivate() {}
-
-    ComPtr<IDXGISwapChain1> swapChain;
-    QSharedPointer<QWindowsDirect2DBitmap> backingStore;
-    QScopedPointer<QWindowsDirect2DPaintDevice> nativePaintDevice;
-
-    bool init(HWND hwnd)
-    {
-        DXGI_SWAP_CHAIN_DESC1 desc = {};
-
-        desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
-        desc.SampleDesc.Count = 1;
-        desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
-        desc.BufferCount = 1;
-        desc.SwapEffect = DXGI_SWAP_EFFECT_SEQUENTIAL;
-
-        HRESULT hr = QWindowsDirect2DContext::instance()->dxgiFactory()->CreateSwapChainForHwnd(
-                    QWindowsDirect2DContext::instance()->d3dDevice(), // [in]   IUnknown *pDevice
-                    hwnd,                                             // [in]   HWND hWnd
-                    &desc,                                            // [in]   const DXGI_SWAP_CHAIN_DESC1 *pDesc
-                    NULL,                                             // [in]   const DXGI_SWAP_CHAIN_FULLSCREEN_DESC *pFullscreenDesc
-                    NULL,                                             // [in]   IDXGIOutput *pRestrictToOutput
-                    swapChain.ReleaseAndGetAddressOf());              // [out]  IDXGISwapChain1 **ppSwapChain
-
-        if (FAILED(hr))
-            qWarning("%s: Could not create swap chain: %#x", __FUNCTION__, hr);
-
-        return SUCCEEDED(hr);
-    }
-
-    bool setupPaintDevice()
-    {
-        if (!backingStore) {
-            ComPtr<ID2D1DeviceContext> deviceContext;
-            ComPtr<IDXGISurface1> backBufferSurface;
-            ComPtr<ID2D1Bitmap1> backBufferBitmap;
-
-            HRESULT hr = QWindowsDirect2DContext::instance()->d2dDevice()->CreateDeviceContext(
-                        D2D1_DEVICE_CONTEXT_OPTIONS_NONE,
-                        deviceContext.ReleaseAndGetAddressOf());
-            if (FAILED(hr)) {
-                qWarning("%s: Couldn't create Direct2D Device context: %#x", __FUNCTION__, hr);
-                return false;
-            }
-
-            hr = swapChain->GetBuffer(0, IID_PPV_ARGS(&backBufferSurface));
-            if (FAILED(hr)) {
-                qWarning("%s: Could not query backbuffer for DXGI Surface: %#x", __FUNCTION__, hr);
-                return false;
-            }
-
-            hr = deviceContext->CreateBitmapFromDxgiSurface(backBufferSurface.Get(), NULL, backBufferBitmap.ReleaseAndGetAddressOf());
-            if (FAILED(hr)) {
-                qWarning("%s: Could not create Direct2D Bitmap from DXGI Surface: %#x", __FUNCTION__, hr);
-                return false;
-            }
-
-            backingStore.reset(new QWindowsDirect2DBitmap(backBufferBitmap.Get(), deviceContext.Get()));
-        }
-
-        if (!nativePaintDevice)
-            nativePaintDevice.reset(new QWindowsDirect2DPaintDevice(backingStore.data(), QInternal::Widget));
-
-        return true;
-    }
-
-    void releaseBackingStore()
-    {
-        nativePaintDevice.reset();
-        backingStore.reset();
-    }
-
-    QPaintDevice *paintDevice()
-    {
-        setupPaintDevice();
-        return nativePaintDevice.data();
-    }
-
-    void flush()
-    {
-        swapChain->Present(1, 0);
-    }
-};
-
 /*!
     \class QWindowsDirect2DBackingStore
     \brief Backing store for windows.
@@ -154,86 +61,43 @@ public:
     \ingroup qt-lighthouse-win
 */
 
-QWindowsDirect2DBackingStore::QWindowsDirect2DBackingStore(QWindow *window)
-    : QPlatformBackingStore(window)
-    , d_ptr(new QWindowsDirect2DBackingStorePrivate)
+static inline QWindowsDirect2DPlatformPixmap *platformPixmap(QPixmap *p)
 {
+    return static_cast<QWindowsDirect2DPlatformPixmap *>(p->handle());
 }
 
-bool QWindowsDirect2DBackingStore::init()
+QWindowsDirect2DBackingStore::QWindowsDirect2DBackingStore(QWindow *window)
+    : QPlatformBackingStore(window)
 {
-    if (window()->surfaceType() == QSurface::RasterSurface) {
-        Q_D(QWindowsDirect2DBackingStore);
-        return d->init(windowsWindow()->handle());
-    }
-
-    return true;
-}
-
-QWindowsDirect2DBackingStore *QWindowsDirect2DBackingStore::create(QWindow *window)
-{
-    QWindowsDirect2DBackingStore *result = new QWindowsDirect2DBackingStore(window);
-
-    if (!result->init()) {
-        delete result;
-        result = 0;
-    }
-
-    return result;
 }
 
 QWindowsDirect2DBackingStore::~QWindowsDirect2DBackingStore()
 {
-    Q_D(QWindowsDirect2DBackingStore);
-    d->releaseBackingStore();
-    d->swapChain.Reset();
 }
 
 QPaintDevice *QWindowsDirect2DBackingStore::paintDevice()
 {
-    QPaintDevice *result = 0;
-
-    if (window()->surfaceType() == QSurface::RasterSurface) {
-        Q_D(QWindowsDirect2DBackingStore);
-        result = d->paintDevice();
-    }
-
-    return result;
+    return m_pixmap.data();
 }
 
-void QWindowsDirect2DBackingStore::flush(QWindow *, const QRegion &, const QPoint &)
+void QWindowsDirect2DBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
 {
-    if (window()->surfaceType() == QSurface::RasterSurface) {
-        Q_D(QWindowsDirect2DBackingStore);
-        d->flush();
-    }
+    QPlatformWindow *pw = window->handle();
+    if (pw && m_pixmap)
+        static_cast<QWindowsDirect2DWindow *>(pw)->flush(platformPixmap(m_pixmap.data())->bitmap(), region, offset);
 }
 
 void QWindowsDirect2DBackingStore::resize(const QSize &size, const QRegion &region)
 {
     Q_UNUSED(region);
 
-    if (window()->surfaceType() != QSurface::RasterSurface)
-        return;
+    QScopedPointer<QPixmap> oldPixmap(m_pixmap.take());
+    m_pixmap.reset(new QPixmap(size.width(), size.height()));
 
-    Q_D(QWindowsDirect2DBackingStore);
-    d->releaseBackingStore();
-    QWindowsDirect2DContext::instance()->d3dDeviceContext()->ClearState();
-
-    HRESULT hr = d->swapChain->ResizeBuffers(0,
-                                             size.width(), size.height(),
-                                             DXGI_FORMAT_UNKNOWN,
-                                             0);
-    if (FAILED(hr))
-        qWarning("%s: Could not resize buffers: %#x", __FUNCTION__, hr);
-}
-
-QWindowsWindow *QWindowsDirect2DBackingStore::windowsWindow() const
-{
-    if (const QWindow *w = window())
-        if (QPlatformWindow *pw = w->handle())
-            return static_cast<QWindowsWindow *>(pw);
-    return 0;
+    if (oldPixmap) {
+        foreach (const QRect &rect, region.rects())
+            platformPixmap(m_pixmap.data())->copy(oldPixmap->handle(), rect);
+    }
 }
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
index 89ecee67dd..9776d234e8 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
@@ -42,33 +42,28 @@
 #ifndef QWINDOWSDIRECT2DBACKINGSTORE_H
 #define QWINDOWSDIRECT2DBACKINGSTORE_H
 
+#include "qwindowsdirect2dplatformpixmap.h"
+
 #include <QtCore/QScopedPointer>
 #include <QtGui/qpa/qplatformbackingstore.h>
+#include <QtGui/QPixmap>
 
 QT_BEGIN_NAMESPACE
 
-class QWindowsWindow;
-class QWindowsDirect2DBackingStorePrivate;
-
 class QWindowsDirect2DBackingStore : public QPlatformBackingStore
 {
-    Q_DECLARE_PRIVATE(QWindowsDirect2DBackingStore)
     Q_DISABLE_COPY(QWindowsDirect2DBackingStore)
 
 public:
-    static QWindowsDirect2DBackingStore *create(QWindow *window);
+    QWindowsDirect2DBackingStore(QWindow *window);
     ~QWindowsDirect2DBackingStore();
 
     QPaintDevice *paintDevice() Q_DECL_OVERRIDE;
-    void flush(QWindow *, const QRegion &region, const QPoint &offset) Q_DECL_OVERRIDE;
+    void flush(QWindow *window, const QRegion &region, const QPoint &offset) Q_DECL_OVERRIDE;
     void resize(const QSize &size, const QRegion &staticContents) Q_DECL_OVERRIDE;
 
 private:
-    QWindowsDirect2DBackingStore(QWindow *window);
-    bool init();
-
-    QWindowsWindow *windowsWindow() const;
-    QScopedPointer<QWindowsDirect2DBackingStorePrivate> d_ptr;
+    QScopedPointer<QPixmap> m_pixmap;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.cpp
index c2f3c05bde..1a26d7029e 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.cpp
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.cpp
@@ -44,11 +44,13 @@
 #include "qwindowsdirect2dbackingstore.h"
 #include "qwindowsdirect2dplatformpixmap.h"
 #include "qwindowsdirect2dnativeinterface.h"
+#include "qwindowsdirect2dwindow.h"
 
 #include "qwindowscontext.h"
 
 #include <QtCore/QDebug>
 #include <QtGui/private/qpixmap_raster_p.h>
+#include <QtGui/qpa/qwindowsysteminterface.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -81,6 +83,13 @@ QWindowsDirect2DIntegration::~QWindowsDirect2DIntegration()
      return static_cast<QWindowsDirect2DIntegration *>(QWindowsIntegration::instance());
  }
 
+ QPlatformWindow *QWindowsDirect2DIntegration::createPlatformWindow(QWindow *window) const
+ {
+     QWindowsWindowData data = createWindowData(window);
+     return data.hwnd ? new QWindowsDirect2DWindow(window, data)
+                      : Q_NULLPTR;
+ }
+
  QPlatformNativeInterface *QWindowsDirect2DIntegration::nativeInterface() const
  {
      return &d->m_nativeInterface;
@@ -100,7 +109,7 @@ QPlatformPixmap *QWindowsDirect2DIntegration::createPlatformPixmap(QPlatformPixm
 
 QPlatformBackingStore *QWindowsDirect2DIntegration::createPlatformBackingStore(QWindow *window) const
 {
-    return QWindowsDirect2DBackingStore::create(window);
+    return new QWindowsDirect2DBackingStore(window);
 }
 
 QWindowsDirect2DContext *QWindowsDirect2DIntegration::direct2DContext() const
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.h b/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.h
index 12412cbc0f..a46d5c0126 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dintegration.h
@@ -60,6 +60,7 @@ public:
 
     static QWindowsDirect2DIntegration *instance();
 
+    QPlatformWindow *createPlatformWindow(QWindow *window) const Q_DECL_OVERRIDE;
     QPlatformNativeInterface *nativeInterface() const Q_DECL_OVERRIDE;
     QPlatformPixmap *createPlatformPixmap(QPlatformPixmap::PixelType type) const Q_DECL_OVERRIDE;
     QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const Q_DECL_OVERRIDE;
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp
new file mode 100644
index 0000000000..bf860f982e
--- /dev/null
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp
@@ -0,0 +1,177 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwindowsdirect2dcontext.h"
+#include "qwindowsdirect2dwindow.h"
+#include "qwindowsdirect2ddevicecontext.h"
+#include "qwindowsdirect2dhelpers.h"
+
+#include <d3d11.h>
+#include <d2d1_1.h>
+using Microsoft::WRL::ComPtr;
+
+QT_BEGIN_NAMESPACE
+
+QWindowsDirect2DWindow::QWindowsDirect2DWindow(QWindow *window, const QWindowsWindowData &data)
+    : QWindowsWindow(window, data)
+    , m_needsFullFlush(true)
+{
+    DXGI_SWAP_CHAIN_DESC1 desc = {};
+
+    desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
+    desc.SampleDesc.Count = 1;
+    desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    desc.BufferCount = 1;
+    desc.SwapEffect = DXGI_SWAP_EFFECT_SEQUENTIAL;
+
+    HRESULT hr = QWindowsDirect2DContext::instance()->dxgiFactory()->CreateSwapChainForHwnd(
+                QWindowsDirect2DContext::instance()->d3dDevice(), // [in]   IUnknown *pDevice
+                handle(),                                         // [in]   HWND hWnd
+                &desc,                                            // [in]   const DXGI_SWAP_CHAIN_DESC1 *pDesc
+                NULL,                                             // [in]   const DXGI_SWAP_CHAIN_FULLSCREEN_DESC *pFullscreenDesc
+                NULL,                                             // [in]   IDXGIOutput *pRestrictToOutput
+                m_swapChain.ReleaseAndGetAddressOf());            // [out]  IDXGISwapChain1 **ppSwapChain
+
+    if (FAILED(hr))
+        qWarning("%s: Could not create swap chain: %#x", __FUNCTION__, hr);
+
+    hr = QWindowsDirect2DContext::instance()->d2dDevice()->CreateDeviceContext(
+                D2D1_DEVICE_CONTEXT_OPTIONS_NONE,
+                m_deviceContext.GetAddressOf());
+    if (FAILED(hr))
+        qWarning("%s: Couldn't create Direct2D Device context: %#x", __FUNCTION__, hr);
+}
+
+QWindowsDirect2DWindow::~QWindowsDirect2DWindow()
+{
+}
+
+void QWindowsDirect2DWindow::flush(QWindowsDirect2DBitmap *bitmap, const QRegion &region, const QPoint &offset)
+{
+    DXGI_SWAP_CHAIN_DESC1 desc;
+    HRESULT hr = m_swapChain->GetDesc1(&desc);
+    QRect geom = geometry();
+
+    if (FAILED(hr) || (desc.Width != geom.width()) || (desc.Height != geom.height())) {
+        resizeSwapChain(geom.size());
+        m_swapChain->GetDesc1(&desc);
+    }
+
+    setupBitmap();
+    if (!m_bitmap)
+        return;
+
+    m_bitmap->deviceContext()->begin();
+
+    ID2D1DeviceContext *dc = m_bitmap->deviceContext()->get();
+    if (!m_needsFullFlush) {
+        QRegion clipped = region;
+        clipped &= QRect(0, 0, desc.Width, desc.Height);
+
+        foreach (const QRect &rect, clipped.rects()) {
+            QRectF rectF(rect);
+            dc->DrawBitmap(bitmap->bitmap(),
+                           to_d2d_rect_f(rectF),
+                           1.0,
+                           D2D1_INTERPOLATION_MODE_LINEAR,
+                           to_d2d_rect_f(rectF.translated(offset.x(), offset.y())));
+        }
+    } else {
+        QRectF rectF(0, 0, desc.Width, desc.Height);
+        dc->DrawBitmap(bitmap->bitmap(),
+                       to_d2d_rect_f(rectF),
+                       1.0,
+                       D2D1_INTERPOLATION_MODE_LINEAR,
+                       to_d2d_rect_f(rectF.translated(offset.x(), offset.y())));
+        m_needsFullFlush = false;
+    }
+
+    m_bitmap->deviceContext()->end();
+    m_swapChain->Present(1, 0);
+}
+
+void QWindowsDirect2DWindow::resizeSwapChain(const QSize &size)
+{
+    if (!m_swapChain)
+        return;
+
+    m_bitmap.reset();
+    m_deviceContext->SetTarget(Q_NULLPTR);
+
+    HRESULT hr = m_swapChain->ResizeBuffers(0,
+                                            size.width(), size.height(),
+                                            DXGI_FORMAT_UNKNOWN,
+                                            0);
+    if (FAILED(hr))
+        qWarning("%s: Could not resize swap chain: %#x", __FUNCTION__, hr);
+
+    m_needsFullFlush = true;
+}
+
+void QWindowsDirect2DWindow::setupBitmap()
+{
+    if (m_bitmap)
+        return;
+
+    if (!m_deviceContext)
+        return;
+
+    if (!m_swapChain)
+        return;
+
+    ComPtr<IDXGISurface1> backBufferSurface;
+    HRESULT hr = m_swapChain->GetBuffer(0, IID_PPV_ARGS(&backBufferSurface));
+    if (FAILED(hr)) {
+        qWarning("%s: Could not query backbuffer for DXGI Surface: %#x", __FUNCTION__, hr);
+        return;
+    }
+
+    ComPtr<ID2D1Bitmap1> backBufferBitmap;
+    hr = m_deviceContext->CreateBitmapFromDxgiSurface(backBufferSurface.Get(), NULL, backBufferBitmap.GetAddressOf());
+    if (FAILED(hr)) {
+        qWarning("%s: Could not create Direct2D Bitmap from DXGI Surface: %#x", __FUNCTION__, hr);
+        return;
+    }
+
+    m_bitmap.reset(new QWindowsDirect2DBitmap(backBufferBitmap.Get(), m_deviceContext.Get()));
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.h b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.h
new file mode 100644
index 0000000000..7996904639
--- /dev/null
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.h
@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINDOWSDIRECT2DWINDOW_H
+#define QWINDOWSDIRECT2DWINDOW_H
+
+#include "qwindowswindow.h"
+#include "qwindowsdirect2dbitmap.h"
+
+#include <dxgi1_2.h>
+#include <wrl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QWindowsDirect2DWindow : public QWindowsWindow
+{
+public:
+    QWindowsDirect2DWindow(QWindow *window, const QWindowsWindowData &data);
+    ~QWindowsDirect2DWindow();
+
+    void flush(QWindowsDirect2DBitmap *bitmap, const QRegion &region, const QPoint &offset);
+
+private:
+    void resizeSwapChain(const QSize &size);
+    void setupBitmap();
+
+private:
+    Microsoft::WRL::ComPtr<IDXGISwapChain1> m_swapChain;
+    Microsoft::WRL::ComPtr<ID2D1DeviceContext> m_deviceContext;
+    QScopedPointer<QWindowsDirect2DBitmap> m_bitmap;
+    bool m_needsFullFlush;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSDIRECT2DWINDOW_H