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diff --git a/vcl/inc/salinst.hxx b/vcl/inc/salinst.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_SALINST_HXX
+#define INCLUDED_VCL_INC_SALINST_HXX
+
+#include <sal/types.h>
+#include <rtl/ref.hxx>
+#include <vcl/dllapi.h>
+#include <vcl/salgtype.hxx>
+#include <vcl/vclenum.hxx>
+
+#include "backend/BackendCapabilities.hxx"
+
+#include "displayconnectiondispatch.hxx"
+
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/ui/dialogs/XFilePicker2.hpp>
+#include <com/sun/star/ui/dialogs/XFolderPicker2.hpp>
+#include <memory>
+
+namespace com {
+namespace sun {
+namespace star {
+namespace awt {
+    class XWindow;
+}
+} } }
+namespace comphelper { class SolarMutex; }
+namespace vcl { class Window; }
+namespace weld {
+    class Builder;
+    class MessageDialog;
+    class Widget;
+    class Window;
+}
+class SystemChildWindow;
+struct SystemParentData;
+struct SalPrinterQueueInfo;
+class ImplJobSetup;
+class OpenGLContext;
+class SalGraphics;
+class SalFrame;
+class SalObject;
+class SalMenu;
+class SalMenuItem;
+class SalVirtualDevice;
+class SalInfoPrinter;
+class SalPrinter;
+class SalTimer;
+class ImplPrnQueueList;
+class SalSystem;
+class SalBitmap;
+struct SalItemParams;
+class SalSession;
+struct SystemGraphicsData;
+struct SystemWindowData;
+class Menu;
+enum class VclInputFlags;
+enum class SalFrameStyleFlags;
+
+typedef struct _cairo_font_options cairo_font_options_t;
+
+class VCL_DLLPUBLIC SalInstance
+{
+private:
+    rtl::Reference< vcl::DisplayConnectionDispatch > m_pEventInst;
+    const std::unique_ptr<comphelper::SolarMutex> m_pYieldMutex;
+    css::uno::Reference<css::uno::XInterface> m_clipboard;
+
+public:
+    SalInstance(std::unique_ptr<comphelper::SolarMutex> pMutex);
+    virtual ~SalInstance();
+
+    //called directly after Application::Init
+    virtual void            AfterAppInit() {}
+    virtual bool            SVMainHook(int*) { return false; }
+
+    // Frame
+    // DisplayName for Unix ???
+    virtual SalFrame*       CreateChildFrame( SystemParentData* pParent, SalFrameStyleFlags nStyle ) = 0;
+    virtual SalFrame*       CreateFrame( SalFrame* pParent, SalFrameStyleFlags nStyle ) = 0;
+    virtual void            DestroyFrame( SalFrame* pFrame ) = 0;
+
+    // Object (System Child Window)
+    virtual SalObject*      CreateObject( SalFrame* pParent, SystemWindowData* pWindowData, bool bShow ) = 0;
+    virtual void            DestroyObject( SalObject* pObject ) = 0;
+
+    // VirtualDevice
+    // nDX and nDY in pixels
+    // nBitCount: 0 == default(=as window) / 1 == mono
+    // pData allows for using a system dependent graphics or device context,
+    // if a system context is passed in nDX and nDY are updated to reflect
+    // its size; otherwise these remain unchanged.
+    virtual std::unique_ptr<SalVirtualDevice>
+                            CreateVirtualDevice( SalGraphics* pGraphics,
+                                                 long &rDX, long &rDY,
+                                                 DeviceFormat eFormat, const SystemGraphicsData *pData = nullptr ) = 0;
+
+    // Printer
+    // pSetupData->mpDriverData can be 0
+    // pSetupData must be updated with the current
+    // JobSetup
+    virtual SalInfoPrinter* CreateInfoPrinter( SalPrinterQueueInfo* pQueueInfo,
+                                               ImplJobSetup* pSetupData ) = 0;
+    virtual void            DestroyInfoPrinter( SalInfoPrinter* pPrinter ) = 0;
+    virtual std::unique_ptr<SalPrinter> CreatePrinter( SalInfoPrinter* pInfoPrinter ) = 0;
+
+    virtual void            GetPrinterQueueInfo( ImplPrnQueueList* pList ) = 0;
+    virtual void            GetPrinterQueueState( SalPrinterQueueInfo* pInfo ) = 0;
+    virtual OUString        GetDefaultPrinter() = 0;
+
+    // SalTimer
+    virtual SalTimer*       CreateSalTimer() = 0;
+    // SalSystem
+    virtual SalSystem*      CreateSalSystem() = 0;
+    // SalBitmap
+    virtual std::shared_ptr<SalBitmap> CreateSalBitmap() = 0;
+    // BackendCapabilities
+    virtual std::shared_ptr<vcl::BackendCapabilities> GetBackendCapabilities()
+    {
+        return std::make_shared<vcl::BackendCapabilities>();
+    }
+
+    // YieldMutex
+    comphelper::SolarMutex* GetYieldMutex();
+    sal_uInt32              ReleaseYieldMutexAll();
+    void                    AcquireYieldMutex(sal_uInt32 nCount = 1);
+
+    // return true, if the current thread is the main thread
+    virtual bool            IsMainThread() const = 0;
+
+    /**
+     * Wait for the next event (if bWait) and dispatch it,
+     * includes posted events, and timers.
+     * If bHandleAllCurrentEvents - dispatch multiple posted
+     * user events. Returns true if events were processed.
+     */
+    virtual bool           DoYield(bool bWait, bool bHandleAllCurrentEvents) = 0;
+    virtual bool           AnyInput( VclInputFlags nType ) = 0;
+
+    // menus
+    virtual std::unique_ptr<SalMenu>     CreateMenu( bool bMenuBar, Menu* pMenu );
+    virtual std::unique_ptr<SalMenuItem> CreateMenuItem( const SalItemParams& pItemData );
+
+    // may return NULL to disable session management, only used by X11 backend
+    virtual std::unique_ptr<SalSession> CreateSalSession();
+
+    virtual OpenGLContext*  CreateOpenGLContext() = 0;
+
+    virtual weld::Builder* CreateBuilder(weld::Widget* pParent, const OUString& rUIRoot, const OUString& rUIFile);
+    virtual weld::Builder* CreateInterimBuilder(vcl::Window* pParent, const OUString& rUIRoot, const OUString& rUIFile);
+    virtual weld::MessageDialog* CreateMessageDialog(weld::Widget* pParent, VclMessageType eMessageType,
+                                                     VclButtonsType eButtonType, const OUString& rPrimaryMessage);
+    virtual weld::Window* GetFrameWeld(const css::uno::Reference<css::awt::XWindow>& rWindow);
+
+    // methods for XDisplayConnection
+
+    void                    SetEventCallback( rtl::Reference< vcl::DisplayConnectionDispatch > const & pInstance )
+        { m_pEventInst = pInstance; }
+
+    bool                    CallEventCallback( void const * pEvent, int nBytes );
+
+    virtual OUString        GetConnectionIdentifier() = 0;
+
+    // dtrans implementation
+    virtual css::uno::Reference< css::uno::XInterface > CreateClipboard( const css::uno::Sequence< css::uno::Any >& i_rArguments );
+    virtual css::uno::Reference< css::uno::XInterface > CreateDragSource();
+    virtual css::uno::Reference< css::uno::XInterface > CreateDropTarget();
+    virtual void            AddToRecentDocumentList(const OUString& rFileUrl, const OUString& rMimeType, const OUString& rDocumentService) = 0;
+
+    virtual bool            hasNativeFileSelection() const { return false; }
+    // if you override this, make sure to override hasNativeFileSelection too.
+    virtual css::uno::Reference< css::ui::dialogs::XFilePicker2 > createFilePicker( const css::uno::Reference< css::uno::XComponentContext >& )
+        { return css::uno::Reference< css::ui::dialogs::XFilePicker2 >(); }
+    virtual css::uno::Reference< css::ui::dialogs::XFolderPicker2 > createFolderPicker( const css::uno::Reference< css::uno::XComponentContext >& )
+        { return css::uno::Reference< css::ui::dialogs::XFolderPicker2 >(); }
+
+    // callbacks for printer updates
+    virtual void            updatePrinterUpdate() {}
+    virtual void            jobStartedPrinterUpdate() {}
+    virtual void            jobEndedPrinterUpdate() {}
+
+    /// Set the app's (somewhat) magic/main-thread to this one.
+    virtual void            updateMainThread() {}
+    /// Disconnect that - good for detaching from the JavaVM on Android.
+    virtual void            releaseMainThread() {}
+
+    /// get information about underlying versions
+    virtual OUString        getOSVersion() { return "-"; }
+
+    virtual const cairo_font_options_t* GetCairoFontOptions() { return nullptr; }
+
+    virtual void* CreateGStreamerSink(const SystemChildWindow*) { return nullptr; }
+};
+
+// called from SVMain
+SalInstance* CreateSalInstance();
+void DestroySalInstance( SalInstance* pInst );
+
+void SalAbort( const OUString& rErrorText, bool bDumpCore );
+
+const OUString& SalGetDesktopEnvironment();
+
+#endif // INCLUDED_VCL_INC_SALINST_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */