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diff --git a/src/plugins/platforms/wasm/qwasmcompositor.h b/src/plugins/platforms/wasm/qwasmcompositor.h
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+++ b/src/plugins/platforms/wasm/qwasmcompositor.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWASMCOMPOSITOR_H
+#define QWASMCOMPOSITOR_H
+
+#include <QtGui/QRegion>
+#include <qpa/qplatformwindow.h>
+
+#include <QOpenGLTextureBlitter>
+#include <QOpenGLTexture>
+#include <QPalette>
+#include <QRect>
+#include <QFontMetrics>
+
+QT_BEGIN_NAMESPACE
+
+class QWasmWindow;
+class QWasmScreen;
+class QOpenGLContext;
+class QOpenGLTextureBlitter;
+
+class QWasmCompositedWindow
+{
+public:
+    QWasmCompositedWindow();
+
+    QWasmWindow *window;
+    QWasmWindow *parentWindow;
+    QRegion damage;
+    bool flushPending;
+    bool visible;
+    QList<QWasmWindow *> childWindows;
+};
+
+class QWasmCompositor : public QObject
+{
+    Q_OBJECT
+public:
+    QWasmCompositor();
+    ~QWasmCompositor();
+
+    enum QWasmSubControl {
+        SC_None =                  0x00000000,
+        SC_TitleBarSysMenu =       0x00000001,
+        SC_TitleBarMinButton =     0x00000002,
+        SC_TitleBarMaxButton =     0x00000004,
+        SC_TitleBarCloseButton =   0x00000008,
+        SC_TitleBarNormalButton =  0x00000010,
+        SC_TitleBarLabel =         0x00000100
+    };
+    Q_DECLARE_FLAGS(SubControls, QWasmSubControl)
+
+    enum QWasmStateFlag {
+        State_None =                0x00000000,
+        State_Enabled =             0x00000001,
+        State_Raised =              0x00000002,
+        State_Sunken =              0x00000004
+    };
+    Q_DECLARE_FLAGS(StateFlags, QWasmStateFlag)
+
+    struct QWasmTitleBarOptions {
+        QRect rect;
+        Qt::WindowFlags flags;
+        int state;
+        QPalette palette;
+        QString titleBarOptionsString;
+        QWasmCompositor::SubControls subControls;
+    };
+
+    struct QWasmFrameOptions {
+        QRect rect;
+        int lineWidth;
+        QPalette palette;
+    };
+
+    void setEnabled(bool enabled);
+
+    void addWindow(QWasmWindow *window, QWasmWindow *parentWindow = nullptr);
+    void removeWindow(QWasmWindow *window);
+    void setScreen(QWasmScreen *screen);
+
+    void setVisible(QWasmWindow *window, bool visible);
+    void raise(QWasmWindow *window);
+    void lower(QWasmWindow *window);
+    void setParent(QWasmWindow *window, QWasmWindow *parent);
+
+    void flush(QWasmWindow *surface, const QRegion &region);
+
+    int windowCount() const;
+
+    void redrawWindowContent();
+    void requestRedraw();
+
+    QWindow *windowAt(QPoint p, int padding = 0) const;
+    QWindow *keyWindow() const;
+
+    bool event(QEvent *event);
+
+    static QWasmTitleBarOptions makeTitleBarOptions(const QWasmWindow *window);
+    static QRect titlebarRect(QWasmTitleBarOptions tb, QWasmCompositor::SubControls subcontrol);
+
+private slots:
+    void frame();
+
+private:
+    void createFrameBuffer();
+    void flush2(const QRegion &region);
+    void flushCompletedCallback(int32_t);
+    void notifyTopWindowChanged(QWasmWindow* window);
+    void drawWindow(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
+    void drawWindowContent(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
+    void blit(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, const QOpenGLTexture *texture, QRect targetGeometry);
+
+    void drawWindowDecorations(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
+    void drwPanelButton();
+private:
+    QImage *m_frameBuffer;
+    QScopedPointer<QOpenGLContext> mContext;
+    QScopedPointer<QOpenGLTextureBlitter> mBlitter;
+    QWasmScreen *mScreen;
+
+    QHash<QWasmWindow *, QWasmCompositedWindow> m_compositedWindows;
+    QList<QWasmWindow *> m_windowStack;
+    QRegion globalDamage; // damage caused by expose, window close, etc.
+    bool m_needComposit;
+    bool m_inFlush;
+    bool m_inResize;
+    bool m_isEnabled;
+    QSize m_targetSize;
+    qreal m_targetDevicePixelRatio;
+
+    static QPalette makeWindowPalette();
+
+    void drawFrameWindow(QWasmFrameOptions options, QPainter *painter);
+    void drawTitlebarWindow(QWasmTitleBarOptions options, QPainter *painter);
+    void drawShadePanel(QWasmTitleBarOptions options, QPainter *painter);
+    void drawItemPixmap(QPainter *painter, const QRect &rect,
+                                    int alignment, const QPixmap &pixmap) const;
+};
+Q_DECLARE_OPERATORS_FOR_FLAGS(QWasmCompositor::SubControls)
+
+QT_END_NAMESPACE
+
+#endif