Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 1761 insertions, 0 deletions

diff --git a/vcl/win/app/fileregistration.cxx b/vcl/win/app/fileregistration.cxx
new file mode 100644
index 000000000..bd31c4acd
--- /dev/null
+++ b/vcl/win/app/fileregistration.cxx
@@ -0,0 +1,186 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#if !defined(NTDDI_VERSION) || NTDDI_VERSION < NTDDI_WIN8
+#define NTDDI_VERSION NTDDI_WIN8 // needed for IApplicationActivationManager
+#endif
+
+#include <sal/config.h>
+
+#include <comphelper/scopeguard.hxx>
+#include <o3tl/char16_t2wchar_t.hxx>
+#include <officecfg/Office/Common.hxx>
+#include <unotools/resmgr.hxx>
+#include <vcl/abstdlg.hxx>
+#include <vcl/fileregistration.hxx>
+
+#include <strings.hrc>
+#include <svdata.hxx>
+
+#include <utility>
+
+#include <prewin.h>
+#include <Shobjidl.h>
+#include <systools/win32/comtools.hxx>
+#include <versionhelpers.h>
+#include <postwin.h>
+
+#define MAX_LONG_PATH 32767
+
+namespace vcl::fileregistration
+{
+static void LaunchModernSettingsDialogDefaultApps()
+{
+    sal::systools::COMReference<IApplicationActivationManager> pIf(
+        CLSID_ApplicationActivationManager, nullptr, CLSCTX_INPROC_SERVER);
+
+    DWORD pid;
+    HRESULT hr = pIf->ActivateApplication(L"windows.immersivecontrolpanel_cw5n1h2txyewy"
+                                          L"!microsoft.windows.immersivecontrolpanel",
+                                          L"page=SettingsPageAppsDefaults", AO_NONE, &pid);
+    if (SUCCEEDED(hr))
+    {
+        // Do not check error because we could at least open
+        // the "Default apps" setting.
+        pIf->ActivateApplication(L"windows.immersivecontrolpanel_cw5n1h2txyewy"
+                                 L"!microsoft.windows.immersivecontrolpanel",
+                                 L"page=SettingsPageAppsDefaults"
+                                 L"&target=SettingsPageAppsDefaultsDefaultAppsListView",
+                                 AO_NONE, &pid);
+    }
+}
+
+static HRESULT
+IsPathDefaultForClass(sal::systools::COMReference<IApplicationAssociationRegistration>& pAAR,
+                      LPCWSTR aClassName, LPCWSTR progID)
+{
+    // Make sure the Prog ID matches what we have
+    LPWSTR registeredApp;
+    HRESULT hr
+        = pAAR->QueryCurrentDefault(aClassName, AT_FILEEXTENSION, AL_EFFECTIVE, &registeredApp);
+    if (FAILED(hr))
+    {
+        return hr;
+    }
+
+    if (!wcsnicmp(registeredApp, progID, wcslen(progID)))
+        hr = S_OK;
+    else
+        hr = S_FALSE;
+
+    CoTaskMemFree(registeredApp);
+
+    return hr;
+}
+
+static bool IsDefaultAppInstalledInReg()
+{
+    const wchar_t* keyPath = L"SOFTWARE\\LibreOffice\\UNO\\InstallPath";
+
+    WCHAR szRegPath[MAX_LONG_PATH];
+    DWORD cbData = static_cast<DWORD>(MAX_LONG_PATH * sizeof(WCHAR));
+    auto rc = RegGetValueW(HKEY_LOCAL_MACHINE, keyPath, nullptr, RRF_RT_REG_SZ, nullptr,
+                           static_cast<PVOID>(szRegPath), &cbData);
+    if (rc != ERROR_SUCCESS)
+        return false;
+
+    WCHAR szProcPath[MAX_LONG_PATH];
+    if (!GetModuleFileNameW(nullptr, szProcPath, MAX_LONG_PATH))
+        return false;
+
+    WCHAR szFullProcPath[MAX_LONG_PATH];
+    if (!GetFullPathNameW(szProcPath, MAX_LONG_PATH, szFullProcPath, nullptr))
+        return false;
+
+    if (!GetLongPathNameW(szFullProcPath, szFullProcPath, MAX_LONG_PATH))
+        return false;
+
+    if (!GetLongPathNameW(szRegPath, szRegPath, MAX_LONG_PATH))
+        return false;
+
+    if (wcslen(szRegPath) > 0 && wcsstr(szFullProcPath, szRegPath) != nullptr)
+        return true;
+
+    return false;
+}
+
+void LaunchRegistrationUI()
+{
+    try
+    {
+        sal::systools::CoInitializeGuard aGuard(COINIT_APARTMENTTHREADED);
+        if (IsWindows10OrGreater())
+        {
+            LaunchModernSettingsDialogDefaultApps();
+        }
+        else
+        {
+            sal::systools::COMReference<IApplicationAssociationRegistrationUI> pIf(
+                CLSID_ApplicationAssociationRegistrationUI, nullptr, CLSCTX_INPROC_SERVER);
+
+            // LaunchAdvancedAssociationUI only works for applications registered under
+            // Software\RegisteredApplications. See scp2/source/ooo/registryitem_ooo.scp
+            const OUString expanded = Translate::ExpandVariables("%PRODUCTNAME %PRODUCTVERSION");
+            pIf->LaunchAdvancedAssociationUI(o3tl::toW(expanded.getStr()));
+        }
+    }
+    catch (...)
+    {
+        // Just ignore any error here: this is not something we need to make sure to succeed
+    }
+}
+
+void CheckFileExtRegistration(weld::Window* pDialogParent)
+{
+    if (!officecfg::Office::Common::Misc::PerformFileExtCheck::get())
+        return;
+
+    if (!IsDefaultAppInstalledInReg())
+        return;
+
+    sal::systools::CoInitializeGuard aGuard(COINIT_APARTMENTTHREADED, false,
+                                            sal::systools::CoInitializeGuard::WhenFailed::NoThrow);
+    sal::systools::COMReference<IApplicationAssociationRegistration> pAAR;
+    try
+    {
+        pAAR.CoCreateInstance(CLSID_ApplicationAssociationRegistration, nullptr,
+                              CLSCTX_INPROC_SERVER);
+    }
+    catch (...)
+    {
+        // Just return on any error here: this is not something we need to make sure to succeed
+        return;
+    }
+
+    static const std::pair<LPCWSTR, LPCWSTR> formats[] = {
+        { L".odp", L"LibreOffice.ImpressDocument.1" },
+        { L".odt", L"LibreOffice.WriterDocument.1" },
+        { L".ods", L"LibreOffice.CalcDocument.1" },
+    };
+    OUString aNonDefaults;
+
+    for (const auto & [ szExt, szProgId ] : formats)
+    {
+        if (IsPathDefaultForClass(pAAR, szExt, szProgId) == S_FALSE)
+            aNonDefaults += OUString::Concat(o3tl::toU(szExt)) + "\n";
+    }
+
+    if (!aNonDefaults.isEmpty())
+    {
+        OUString aMsg(VclResId(STR_FILEEXT_NONDEFAULT_ASK_MSG).replaceFirst("$1", aNonDefaults));
+
+        VclAbstractDialogFactory* pFact = VclAbstractDialogFactory::Create();
+        ScopedVclPtr<VclAbstractDialog> pDlg(pFact->CreateFileExtCheckDialog(
+            pDialogParent, VclResId(STR_FILEEXT_NONDEFAULT_ASK_TITLE), aMsg));
+        pDlg->Execute();
+    }
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/vcl/win/app/saldata.cxx b/vcl/win/app/saldata.cxx
new file mode 100644
index 000000000..31fa66163
--- /dev/null
+++ b/vcl/win/app/saldata.cxx
@@ -0,0 +1,78 @@
+/* -*- 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 .
+ */
+
+#include <svsys.h>
+#include <rtl/tencinfo.h>
+#include <vcl/svapp.hxx>
+
+#include <win/saldata.hxx>
+
+rtl_TextEncoding ImplSalGetSystemEncoding()
+{
+    static const UINT nOldAnsiCodePage = 0;
+    static rtl_TextEncoding eEncoding = RTL_TEXTENCODING_MS_1252;
+
+    UINT nAnsiCodePage = GetACP();
+    if ( nAnsiCodePage != nOldAnsiCodePage )
+    {
+        rtl_TextEncoding nEnc
+            = rtl_getTextEncodingFromWindowsCodePage(nAnsiCodePage);
+        if (nEnc != RTL_TEXTENCODING_DONTKNOW)
+            eEncoding = nEnc;
+    }
+
+    return eEncoding;
+}
+
+OUString ImplSalGetUniString(const char* pStr, sal_Int32 const nLen)
+{
+    return OUString( pStr, (-1 == nLen) ? strlen(pStr) : nLen,
+                      ImplSalGetSystemEncoding(),
+                      RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_DEFAULT |
+                      RTL_TEXTTOUNICODE_FLAGS_MBUNDEFINED_DEFAULT |
+                      RTL_TEXTTOUNICODE_FLAGS_INVALID_DEFAULT );
+}
+
+int ImplSalWICompareAscii( const wchar_t* pStr1, const char* pStr2 )
+{
+    int         nRet;
+    char       c2;
+    do
+    {
+        // change to LowerCase if the char is between 'A' and 'Z'
+        wchar_t c1 = *pStr1;
+        c2 = *pStr2;
+        if ( (c1 >= 65) && (c1 <= 90) )
+            c1 += 32;
+        if ( (c2 >= 65) && (c2 <= 90) )
+            c2 += 32;
+        nRet = static_cast<sal_Int32>(c1)- static_cast<sal_Int32>(static_cast<unsigned char>(c2));
+        if ( nRet != 0 )
+            break;
+
+        pStr1++;
+        pStr2++;
+    }
+    while ( c2 );
+
+    return nRet;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/win/app/salinfo.cxx b/vcl/win/app/salinfo.cxx
new file mode 100644
index 000000000..2787797a6
--- /dev/null
+++ b/vcl/win/app/salinfo.cxx
@@ -0,0 +1,176 @@
+/* -*- 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 .
+ */
+
+#include <svsys.h>
+#include <o3tl/char16_t2wchar_t.hxx>
+
+#include <sal/log.hxx>
+#include <vcl/window.hxx>
+
+#include <win/salsys.h>
+#include <win/salframe.h>
+#include <win/salinst.h>
+#include <win/saldata.hxx>
+
+#include <svdata.hxx>
+
+#include <unordered_map>
+
+SalSystem* WinSalInstance::CreateSalSystem()
+{
+    return new WinSalSystem();
+}
+
+WinSalSystem::~WinSalSystem()
+{
+}
+
+static BOOL CALLBACK ImplEnumMonitorProc( HMONITOR hMonitor,
+                                          HDC hDC,
+                                          LPRECT lpRect,
+                                          LPARAM dwData )
+{
+    WinSalSystem* pSys = reinterpret_cast<WinSalSystem*>(dwData);
+    return pSys->handleMonitorCallback( reinterpret_cast<sal_IntPtr>(hMonitor),
+                                        reinterpret_cast<sal_IntPtr>(hDC),
+                                        reinterpret_cast<sal_IntPtr>(lpRect) );
+}
+
+bool WinSalSystem::handleMonitorCallback( sal_IntPtr hMonitor, sal_IntPtr, sal_IntPtr )
+{
+    MONITORINFOEXW aInfo;
+    aInfo.cbSize = sizeof( aInfo );
+    if( GetMonitorInfoW( reinterpret_cast<HMONITOR>(hMonitor), &aInfo ) )
+    {
+        aInfo.szDevice[CCHDEVICENAME-1] = 0;
+        OUString aDeviceName( o3tl::toU(aInfo.szDevice) );
+        std::map< OUString, unsigned int >::const_iterator it =
+            m_aDeviceNameToMonitor.find( aDeviceName );
+        if( it != m_aDeviceNameToMonitor.end() )
+        {
+            DisplayMonitor& rMon( m_aMonitors[ it->second ] );
+            rMon.m_aArea = tools::Rectangle( Point( aInfo.rcMonitor.left,
+                                             aInfo.rcMonitor.top ),
+                                      Size( aInfo.rcMonitor.right - aInfo.rcMonitor.left,
+                                            aInfo.rcMonitor.bottom - aInfo.rcMonitor.top ) );
+            if( (aInfo.dwFlags & MONITORINFOF_PRIMARY) != 0 )
+                m_nPrimary = it->second;
+        }
+    }
+    return true;
+}
+
+void WinSalSystem::clearMonitors()
+{
+    m_aMonitors.clear();
+    m_nPrimary = 0;
+}
+
+bool WinSalSystem::initMonitors()
+{
+    if( m_aMonitors.size() > 0 )
+        return true;
+
+    int nMonitors = GetSystemMetrics( SM_CMONITORS );
+    if( nMonitors == 1 )
+    {
+        int w = GetSystemMetrics( SM_CXSCREEN );
+        int h = GetSystemMetrics( SM_CYSCREEN );
+        m_aMonitors.push_back( DisplayMonitor( OUString(),
+                                               tools::Rectangle( Point(), Size( w, h ) ) ) );
+        m_aDeviceNameToMonitor[ OUString() ] = 0;
+        m_nPrimary = 0;
+    }
+    else
+    {
+        DISPLAY_DEVICEW aDev;
+        aDev.cb = sizeof( aDev );
+        DWORD nDevice = 0;
+        std::unordered_map< OUString, int > aDeviceStringCount;
+        while( EnumDisplayDevicesW( nullptr, nDevice++, &aDev, 0 ) )
+        {
+            if( (aDev.StateFlags & DISPLAY_DEVICE_ACTIVE)
+                && !(aDev.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER) ) // sort out non/disabled monitors
+            {
+                aDev.DeviceName[31] = 0;
+                aDev.DeviceString[127] = 0;
+                OUString aDeviceName( o3tl::toU(aDev.DeviceName) );
+                OUString aDeviceString( o3tl::toU(aDev.DeviceString) );
+                aDeviceStringCount[ aDeviceString ]++;
+                m_aDeviceNameToMonitor[ aDeviceName ] = m_aMonitors.size();
+                m_aMonitors.push_back( DisplayMonitor( aDeviceString,
+                                                       tools::Rectangle() ) );
+            }
+        }
+        HDC aDesktopRC = GetDC( nullptr );
+        EnumDisplayMonitors( aDesktopRC, nullptr, ImplEnumMonitorProc, reinterpret_cast<LPARAM>(this) );
+
+        // append monitor numbers to name strings
+        std::unordered_map< OUString, int > aDevCount( aDeviceStringCount );
+        unsigned int nMonitorCount = m_aMonitors.size();
+        for( unsigned int i = 0; i < nMonitorCount; i++ )
+        {
+            const OUString& rDev( m_aMonitors[i].m_aName );
+            if( aDeviceStringCount[ rDev ] > 1 )
+            {
+                int nInstance = aDeviceStringCount[ rDev ] - (-- aDevCount[ rDev ] );
+                m_aMonitors[ i ].m_aName = rDev + " (" + OUString::number( nInstance ) + ")";
+            }
+        }
+    }
+
+    return m_aMonitors.size() > 0;
+}
+
+unsigned int WinSalSystem::GetDisplayScreenCount()
+{
+    initMonitors();
+    return m_aMonitors.size();
+}
+
+unsigned int WinSalSystem::GetDisplayBuiltInScreen()
+{
+    initMonitors();
+    return m_nPrimary;
+}
+
+tools::Rectangle WinSalSystem::GetDisplayScreenPosSizePixel( unsigned int nScreen )
+{
+    initMonitors();
+    if (nScreen >= m_aMonitors.size())
+    {
+        SAL_WARN("vcl", "Requested screen size/pos for screen #"
+                            << nScreen << ", but only " << m_aMonitors.size() << " screens found.");
+        assert(false);
+        return tools::Rectangle();
+    }
+    return m_aMonitors[nScreen].m_aArea;
+}
+
+int WinSalSystem::ShowNativeMessageBox(const OUString& rTitle, const OUString& rMessage)
+{
+    ImplHideSplash();
+    return MessageBoxW(
+        nullptr,
+        o3tl::toW(rMessage.getStr()),
+        o3tl::toW(rTitle.getStr()),
+        MB_TASKMODAL | MB_SETFOREGROUND | MB_ICONWARNING | MB_DEFBUTTON1);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/win/app/salinst.cxx b/vcl/win/app/salinst.cxx
new file mode 100644
index 000000000..f62d8ef71
--- /dev/null
+++ b/vcl/win/app/salinst.cxx
@@ -0,0 +1,1008 @@
+/* -*- 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 .
+ */
+
+#include <string.h>
+#include <svsys.h>
+#include <process.h>
+
+#include <osl/conditn.hxx>
+#include <osl/file.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <sal/log.hxx>
+#include <tools/debug.hxx>
+#include <tools/time.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/solarmutex.hxx>
+#include <comphelper/windowserrorstring.hxx>
+#include <com/sun/star/uno/Reference.h>
+#include <o3tl/char16_t2wchar_t.hxx>
+
+#include <dndhelper.hxx>
+#include <vcl/inputtypes.hxx>
+#include <vcl/opengl/OpenGLContext.hxx>
+#include <vcl/sysdata.hxx>
+#include <vcl/timer.hxx>
+#include <vclpluginapi.h>
+
+#include <win/dnd_source.hxx>
+#include <win/dnd_target.hxx>
+#include <win/wincomp.hxx>
+#include <win/salids.hrc>
+#include <win/saldata.hxx>
+#include <win/salinst.h>
+#include <win/salframe.h>
+#include <win/salobj.h>
+#include <win/saltimer.h>
+#include <win/salbmp.h>
+#include <win/winlayout.hxx>
+
+#include <config_features.h>
+#include <vcl/skia/SkiaHelper.hxx>
+#if HAVE_FEATURE_SKIA
+#include <config_skia.h>
+#include <skia/salbmp.hxx>
+#include <skia/win/gdiimpl.hxx>
+#endif
+
+#include <salsys.hxx>
+
+#include <desktop/crashreport.hxx>
+
+#if defined _MSC_VER
+#ifndef min
+#define min(a,b)    (((a) < (b)) ? (a) : (b))
+#endif
+#ifndef max
+#define max(a,b)    (((a) > (b)) ? (a) : (b))
+#endif
+#endif
+
+#include <prewin.h>
+
+#include <gdiplus.h>
+#include <shlobj.h>
+
+#include <postwin.h>
+
+static LRESULT CALLBACK SalComWndProcW( HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam );
+
+class SalYieldMutex : public comphelper::SolarMutex
+{
+public: // for ImplSalYield() and ImplSalYieldMutexAcquireWithWait()
+    osl::Condition            m_condition; /// for MsgWaitForMultipleObjects()
+
+protected:
+    virtual void              doAcquire( sal_uInt32 nLockCount ) override;
+    virtual sal_uInt32        doRelease( bool bUnlockAll ) override;
+
+    static void               BeforeReleaseHandler();
+
+public:
+    explicit SalYieldMutex();
+
+    virtual bool              IsCurrentThread() const override;
+    virtual bool              tryToAcquire() override;
+};
+
+SalYieldMutex::SalYieldMutex()
+{
+    SetBeforeReleaseHandler( &SalYieldMutex::BeforeReleaseHandler );
+}
+
+void SalYieldMutex::BeforeReleaseHandler()
+{
+    OpenGLContext::prepareForYield();
+
+    if ( GetSalData()->mnAppThreadId != GetCurrentThreadId() )
+    {
+        // If we don't call these message, the Output from the
+        // Java clients doesn't come in the right order
+        GdiFlush();
+    }
+}
+
+/// note: while VCL is fully up and running (other threads started and
+/// before shutdown), the main thread must acquire SolarMutex only via
+/// this function to avoid deadlock
+void SalYieldMutex::doAcquire( sal_uInt32 nLockCount )
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    if ( pInst && pInst->IsMainThread() )
+    {
+        if ( pInst->m_nNoYieldLock )
+            return;
+        // tdf#96887 If this is the main thread, then we must wait for two things:
+        // - the yield mutex being unlocked
+        // - SendMessage() being triggered
+        // This can nicely be done using MsgWaitForMultipleObjects, which is called in
+        // m_condition.wait(). The 2nd one is
+        // needed because if we don't reschedule, then we create deadlocks if a
+        // Window's create/destroy is called via SendMessage() from another thread.
+        // Have a look at the osl_waitCondition implementation for more info.
+        do {
+            // Calling Condition::reset frequently turns out to be a little expensive,
+            // and the vast majority of the time there is no contention, so first
+            // try just acquiring the mutex.
+            if (m_aMutex.tryToAcquire())
+                break;
+            // reset condition *before* acquiring!
+            m_condition.reset();
+            if (m_aMutex.tryToAcquire())
+                break;
+            // wait for SalYieldMutex::release() to set the condition
+            osl::Condition::Result res = m_condition.wait();
+            assert(osl::Condition::Result::result_ok == res);
+            (void) res;
+        }
+        while ( true );
+    }
+    else
+        m_aMutex.acquire();
+    ++m_nCount;
+    --nLockCount;
+
+    comphelper::SolarMutex::doAcquire( nLockCount );
+}
+
+sal_uInt32 SalYieldMutex::doRelease( const bool bUnlockAll )
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    if ( pInst && pInst->m_nNoYieldLock && pInst->IsMainThread() )
+        return 1;
+
+    sal_uInt32 nCount = comphelper::SolarMutex::doRelease( bUnlockAll );
+    // wake up ImplSalYieldMutexAcquireWithWait() after release
+    if ( 0 == m_nCount )
+        m_condition.set();
+    return nCount;
+}
+
+bool SalYieldMutex::tryToAcquire()
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    if ( pInst )
+    {
+        if ( pInst->m_nNoYieldLock && pInst->IsMainThread() )
+            return true;
+        else
+            return comphelper::SolarMutex::tryToAcquire();
+    }
+    else
+        return false;
+}
+
+void ImplSalYieldMutexAcquireWithWait( sal_uInt32 nCount )
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    if ( pInst )
+        pInst->GetYieldMutex()->acquire( nCount );
+}
+
+bool ImplSalYieldMutexTryToAcquire()
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    return pInst && pInst->GetYieldMutex()->tryToAcquire();
+}
+
+void ImplSalYieldMutexRelease()
+{
+    WinSalInstance* pInst = GetSalData()->mpInstance;
+    if ( pInst )
+    {
+        GdiFlush();
+        pInst->GetYieldMutex()->release();
+    }
+}
+
+bool SalYieldMutex::IsCurrentThread() const
+{
+    if ( !GetSalData()->mpInstance->m_nNoYieldLock )
+        return SolarMutex::IsCurrentThread();
+    else
+        return GetSalData()->mpInstance->IsMainThread();
+}
+
+void SalData::initKeyCodeMap()
+{
+    UINT nKey;
+    #define initKey( a, b )\
+        nKey = LOWORD( VkKeyScanW( a ) );\
+        if( nKey < 0xffff )\
+            maVKMap[ nKey ] = b;
+
+    maVKMap.clear();
+
+    initKey( L'+', KEY_ADD );
+    initKey( L'-', KEY_SUBTRACT );
+    initKey( L'*', KEY_MULTIPLY );
+    initKey( L'/', KEY_DIVIDE );
+    initKey( L'.', KEY_POINT );
+    initKey( L',', KEY_COMMA );
+    initKey( L'<', KEY_LESS );
+    initKey( L'>', KEY_GREATER );
+    initKey( L'=', KEY_EQUAL );
+    initKey( L'~', KEY_TILDE );
+    initKey( L'`', KEY_QUOTELEFT );
+    initKey( L'[', KEY_BRACKETLEFT );
+    initKey( L']', KEY_BRACKETRIGHT );
+    initKey( L';', KEY_SEMICOLON );
+    initKey( L'\'', KEY_QUOTERIGHT );
+}
+
+// SalData
+
+SalData::SalData()
+    : sal::systools::CoInitializeGuard(COINIT_APARTMENTTHREADED, false,
+                                       sal::systools::CoInitializeGuard::WhenFailed::NoThrow)
+         // put main thread in Single Threaded Apartment (STA)
+{
+    mhInst = nullptr;           // default instance handle
+    mnCmdShow = 0;              // default frame show style
+    mhDitherPal = nullptr;      // dither palette
+    mhDitherDIB = nullptr;      // dither memory handle
+    mpDitherDIB = nullptr;      // dither memory
+    mpDitherDIBData = nullptr;  // beginning of DIB data
+    mpDitherDiff = nullptr;     // Dither mapping table
+    mpDitherLow = nullptr;      // Dither mapping table
+    mpDitherHigh = nullptr;     // Dither mapping table
+    mhSalObjMsgHook = nullptr;  // hook to get interesting msg for SalObject
+    mhWantLeaveMsg = nullptr;   // window handle, that want a MOUSELEAVE message
+    mpMouseLeaveTimer = nullptr; // Timer for MouseLeave Test
+    mpInstance = nullptr;  // pointer of first instance
+    mpFirstFrame = nullptr;     // pointer of first frame
+    mpFirstObject = nullptr;    // pointer of first object window
+    mpFirstVD = nullptr;        // first VirDev
+    mpFirstPrinter = nullptr;   // first printing printer
+    mpHDCCache = nullptr;       // Cache for three DC's
+    mh50Bmp = nullptr;          // 50% Bitmap
+    mh50Brush = nullptr;        // 50% Brush
+    int i;
+    for(i=0; i<MAX_STOCKPEN; i++)
+    {
+        maStockPenColorAry[i] = 0;
+        mhStockPenAry[i] = nullptr;
+    }
+    for(i=0; i<MAX_STOCKBRUSH; i++)
+    {
+        maStockBrushColorAry[i] = 0;
+        mhStockBrushAry[i] = nullptr;
+    }
+    mnStockPenCount = 0;        // count of static pens
+    mnStockBrushCount = 0;      // count of static brushes
+    mnSalObjWantKeyEvt = 0;     // KeyEvent for the SalObj hook
+    mnCacheDCInUse = 0;         // count of CacheDC in use
+    mbObjClassInit = false;     // is SALOBJECTCLASS initialised
+    mbInPalChange = false;      // is in WM_QUERYNEWPALETTE
+    mnAppThreadId = 0;          // Id from Application-Thread
+    mbScrSvrEnabled = FALSE;    // ScreenSaver enabled
+    mpFirstIcon = nullptr;      // icon cache, points to first icon, NULL if none
+    mpSharedTempFontItem = nullptr;
+    mpOtherTempFontItem = nullptr;
+    mbThemeChanged = false;     // true if visual theme was changed: throw away theme handles
+    mbThemeMenuSupport = false;
+
+    // init with NULL
+    gdiplusToken = 0;
+
+    initKeyCodeMap();
+
+    SetSalData( this );
+    initNWF();
+
+    static Gdiplus::GdiplusStartupInput gdiplusStartupInput;
+    Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr);
+}
+
+SalData::~SalData()
+{
+    deInitNWF();
+    SetSalData( nullptr );
+
+    if (gdiplusToken)
+        Gdiplus::GdiplusShutdown(gdiplusToken);
+}
+
+bool OSSupportsDarkMode()
+{
+    bool bRet = false;
+    if (HMODULE h_ntdll = GetModuleHandleW(L"ntdll.dll"))
+    {
+        typedef LONG(WINAPI* RtlGetVersion_t)(PRTL_OSVERSIONINFOW);
+        if (auto RtlGetVersion
+            = reinterpret_cast<RtlGetVersion_t>(GetProcAddress(h_ntdll, "RtlGetVersion")))
+        {
+            RTL_OSVERSIONINFOW vi2{};
+            vi2.dwOSVersionInfoSize = sizeof(vi2);
+            if (RtlGetVersion(&vi2) == 0)
+            {
+                if (vi2.dwMajorVersion > 10)
+                    bRet = true;
+                else if (vi2.dwMajorVersion == 10)
+                {
+                    if (vi2.dwMinorVersion > 0)
+                        bRet = true;
+                    else if (vi2.dwBuildNumber >= 18362)
+                        bRet = true;
+                }
+            }
+        }
+    }
+    return bRet;
+}
+
+namespace {
+
+enum PreferredAppMode
+{
+    Default,
+    AllowDark,
+    ForceDark,
+    ForceLight,
+    Max
+};
+
+}
+
+extern "C" {
+VCLPLUG_WIN_PUBLIC SalInstance* create_SalInstance()
+{
+    SalData* pSalData = new SalData();
+
+    STARTUPINFOW aSI;
+    aSI.cb = sizeof( aSI );
+    GetStartupInfoW( &aSI );
+    pSalData->mhInst = GetModuleHandleW( nullptr );
+    pSalData->mnCmdShow = aSI.wShowWindow;
+
+    pSalData->mnAppThreadId = GetCurrentThreadId();
+
+    static bool bSetAllowDarkMode = OSSupportsDarkMode(); // too early to additionally check LibreOffice's config
+    if (bSetAllowDarkMode)
+    {
+        typedef PreferredAppMode(WINAPI* SetPreferredAppMode_t)(PreferredAppMode);
+        if (HINSTANCE hUxthemeLib = LoadLibraryExW(L"uxtheme.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32))
+        {
+            if (auto SetPreferredAppMode = reinterpret_cast<SetPreferredAppMode_t>(GetProcAddress(hUxthemeLib, MAKEINTRESOURCEA(135))))
+                SetPreferredAppMode(AllowDark);
+            FreeLibrary(hUxthemeLib);
+        }
+    }
+
+    // register frame class
+    WNDCLASSEXW aWndClassEx;
+    aWndClassEx.cbSize          = sizeof( aWndClassEx );
+    aWndClassEx.style           = CS_OWNDC;
+    aWndClassEx.lpfnWndProc     = SalFrameWndProcW;
+    aWndClassEx.cbClsExtra      = 0;
+    aWndClassEx.cbWndExtra      = SAL_FRAME_WNDEXTRA;
+    aWndClassEx.hInstance       = pSalData->mhInst;
+    aWndClassEx.hCursor         = nullptr;
+    aWndClassEx.hbrBackground   = nullptr;
+    aWndClassEx.lpszMenuName    = nullptr;
+    aWndClassEx.lpszClassName   = SAL_FRAME_CLASSNAMEW;
+    ImplLoadSalIcon( SAL_RESID_ICON_DEFAULT, aWndClassEx.hIcon, aWndClassEx.hIconSm );
+    if ( !RegisterClassExW( &aWndClassEx ) )
+        return nullptr;
+
+    aWndClassEx.hIcon           = nullptr;
+    aWndClassEx.hIconSm         = nullptr;
+    aWndClassEx.style          |= CS_SAVEBITS;
+    aWndClassEx.lpszClassName   = SAL_SUBFRAME_CLASSNAMEW;
+    if ( !RegisterClassExW( &aWndClassEx ) )
+        return nullptr;
+
+    // shadow effect for popups on XP
+    aWndClassEx.style          |= CS_DROPSHADOW;
+    aWndClassEx.lpszClassName   = SAL_TMPSUBFRAME_CLASSNAMEW;
+    if ( !RegisterClassExW( &aWndClassEx ) )
+        return nullptr;
+
+    aWndClassEx.style           = 0;
+    aWndClassEx.lpfnWndProc     = SalComWndProcW;
+    aWndClassEx.cbWndExtra      = 0;
+    aWndClassEx.lpszClassName   = SAL_COM_CLASSNAMEW;
+    if ( !RegisterClassExW( &aWndClassEx ) )
+        return nullptr;
+
+    HWND hComWnd = CreateWindowExW( WS_EX_TOOLWINDOW, SAL_COM_CLASSNAMEW,
+                               L"", WS_POPUP, 0, 0, 0, 0, nullptr, nullptr,
+                               pSalData->mhInst, nullptr );
+    if ( !hComWnd )
+        return nullptr;
+
+    WinSalInstance* pInst = new WinSalInstance;
+
+    // init instance (only one instance in this version !!!)
+    pSalData->mpInstance   = pInst;
+    pInst->mhInst    = pSalData->mhInst;
+    pInst->mhComWnd  = hComWnd;
+
+    // init static GDI Data
+    ImplInitSalGDI();
+
+    return pInst;
+}
+}
+
+WinSalInstance::WinSalInstance()
+    : SalInstance(std::make_unique<SalYieldMutex>())
+    , mhInst( nullptr )
+    , mhComWnd( nullptr )
+    , m_nNoYieldLock( 0 )
+{
+    ImplSVData* pSVData = ImplGetSVData();
+    pSVData->maAppData.mxToolkitName = OUString("win");
+    m_bSupportsOpenGL = true;
+#if HAVE_FEATURE_SKIA
+    WinSkiaSalGraphicsImpl::prepareSkia();
+#if SKIA_USE_BITMAP32
+    if (SkiaHelper::isVCLSkiaEnabled())
+        m_bSupportsBitmap32 = true;
+#endif
+#endif
+}
+
+WinSalInstance::~WinSalInstance()
+{
+    ImplFreeSalGDI();
+    DestroyWindow( mhComWnd );
+#if HAVE_FEATURE_SKIA
+    SkiaHelper::cleanup();
+#endif
+}
+
+static LRESULT ImplSalDispatchMessage( const MSG* pMsg )
+{
+    SalData* pSalData = GetSalData();
+    if ( pSalData->mpFirstObject && ImplSalPreDispatchMsg( pMsg ) )
+        return 0;
+    LRESULT lResult = DispatchMessageW( pMsg );
+    if ( pSalData->mpFirstObject )
+        ImplSalPostDispatchMsg( pMsg );
+    return lResult;
+}
+
+// probably can't be static, because of SalTimer friend? (static gives C4211)
+bool ImplSalYield(const bool bWait, const bool bHandleAllCurrentEvents)
+{
+    // used to abort further message processing on tick count wraps
+    static sal_uInt32 nLastTicks = 0;
+
+    // we should never yield in m_nNoYieldLock mode!
+    const bool bNoYieldLock = (GetSalData()->mpInstance->m_nNoYieldLock > 0);
+    assert(!bNoYieldLock);
+    if (bNoYieldLock)
+        return false;
+
+    MSG aMsg;
+    bool bWasMsg = false, bWasTimeoutMsg = false;
+    WinSalTimer* pTimer = static_cast<WinSalTimer*>(ImplGetSVData()->maSchedCtx.mpSalTimer);
+
+    sal_uInt32 nCurTicks = GetTickCount();
+
+    do
+    {
+        if (!PeekMessageW(&aMsg, nullptr, 0, 0, PM_REMOVE))
+            break;
+
+        bWasMsg = true;
+        TranslateMessage(&aMsg);
+        LRESULT nRet = ImplSalDispatchMessage(&aMsg);
+
+        bWasTimeoutMsg |= (SAL_MSG_TIMER_CALLBACK == aMsg.message) && static_cast<bool>(nRet);
+
+        if (!bHandleAllCurrentEvents)
+            break;
+
+        if ((aMsg.time > nCurTicks) && (nLastTicks <= nCurTicks || aMsg.time < nLastTicks))
+            break;
+    }
+    while( true );
+
+    // 0ms timeouts are handled out-of-bounds to prevent busy-locking the
+    // event loop with timeout messages.
+    // We ensure we never handle more than one timeout per call.
+    // This way we'll always process a normal system message.
+    if ( !bWasTimeoutMsg && pTimer && pTimer->IsDirectTimeout() )
+    {
+        pTimer->ImplHandleElapsedTimer();
+        bWasMsg = true;
+    }
+
+    nLastTicks = nCurTicks;
+
+    if ( bWait && !bWasMsg )
+    {
+        switch (GetMessageW(&aMsg, nullptr, 0, 0))
+        {
+            case -1:
+                SAL_WARN("vcl.schedule", "GetMessageW failed: " << WindowsErrorString(GetLastError()));
+                // should we std::abort() / SalAbort here?
+                break;
+            case 0:
+                SAL_INFO("vcl.schedule", "GetMessageW received WM_QUIT while waiting");
+                break;
+            default:
+                bWasMsg = true;
+                TranslateMessage(&aMsg);
+                ImplSalDispatchMessage(&aMsg);
+                break;
+        }
+    }
+
+    // If we enabled ForceRealTimer mode skipping our direct timeout processing,
+    // mainly because some Windows API call spawns its own nested message loop,
+    // switch back to our own processing (like after window resize or move)
+    if ( pTimer )
+        pTimer->SetForceRealTimer( false );
+
+    return bWasMsg;
+}
+
+bool WinSalInstance::IsMainThread() const
+{
+    const SalData* pSalData = GetSalData();
+    return pSalData->mnAppThreadId == GetCurrentThreadId();
+}
+
+bool WinSalInstance::DoYield(bool bWait, bool bHandleAllCurrentEvents)
+{
+    bool bDidWork = false;
+    SolarMutexReleaser aReleaser;
+    if ( !IsMainThread() )
+    {
+        bDidWork = SendMessageW( mhComWnd, SAL_MSG_THREADYIELD,
+                                 WPARAM(false), static_cast<LPARAM>(bHandleAllCurrentEvents) );
+        if ( !bDidWork && bWait )
+        {
+            maWaitingYieldCond.reset();
+            maWaitingYieldCond.wait();
+            bDidWork = true;
+        }
+    }
+    else
+    {
+        bDidWork = ImplSalYield( bWait, bHandleAllCurrentEvents );
+        if ( bDidWork )
+            maWaitingYieldCond.set();
+    }
+
+    return bDidWork;
+}
+
+#define CASE_NOYIELDLOCK( salmsg, function ) \
+    case salmsg: \
+        if (bIsOtherThreadMessage) \
+        { \
+            ++pInst->m_nNoYieldLock; \
+            function; \
+            --pInst->m_nNoYieldLock; \
+        } \
+        else \
+        { \
+            DBG_TESTSOLARMUTEX(); \
+            function; \
+        } \
+        break;
+
+#define CASE_NOYIELDLOCK_RESULT( salmsg, function ) \
+    case salmsg: \
+        if (bIsOtherThreadMessage) \
+        { \
+            ++pInst->m_nNoYieldLock; \
+            nRet = reinterpret_cast<LRESULT>( function ); \
+            --pInst->m_nNoYieldLock; \
+        } \
+        else \
+        { \
+            DBG_TESTSOLARMUTEX(); \
+            nRet = reinterpret_cast<LRESULT>( function ); \
+        } \
+        break;
+
+LRESULT CALLBACK SalComWndProc( HWND, UINT nMsg, WPARAM wParam, LPARAM lParam, bool& rDef )
+{
+    const bool bIsOtherThreadMessage = InSendMessage();
+    LRESULT nRet = 0;
+    WinSalInstance *pInst = GetSalData()->mpInstance;
+    WinSalTimer *const pTimer = static_cast<WinSalTimer*>( ImplGetSVData()->maSchedCtx.mpSalTimer );
+
+    SAL_INFO("vcl.gdi.wndproc", "SalComWndProc(nMsg=" << nMsg << ", wParam=" << wParam
+                                << ", lParam=" << lParam << "); inSendMsg: " << bIsOtherThreadMessage);
+
+    if (ImplGetSVData()->mbDeInit)
+    {
+        SAL_WARN("vcl.gdi.wndproc", "ignoring timer event because we are shutting down");
+        return 0;
+    }
+
+    switch ( nMsg )
+    {
+        case SAL_MSG_THREADYIELD:
+            assert( !static_cast<bool>(wParam) );
+            nRet = static_cast<LRESULT>(ImplSalYield(
+                false, static_cast<bool>( lParam ) ));
+            break;
+
+        case SAL_MSG_STARTTIMER:
+        {
+            auto const nParam = static_cast<sal_uInt64>( lParam );
+            sal_uInt64 nTime = tools::Time::GetSystemTicks();
+            if ( nTime < nParam )
+                nTime = nParam - nTime;
+            else
+                nTime = 0;
+            assert( pTimer != nullptr );
+            pTimer->ImplStart( nTime );
+            break;
+        }
+
+        case SAL_MSG_STOPTIMER:
+            assert( pTimer != nullptr );
+            pTimer->ImplStop();
+            break;
+
+        CASE_NOYIELDLOCK_RESULT( SAL_MSG_CREATEFRAME, ImplSalCreateFrame( GetSalData()->mpInstance,
+            reinterpret_cast<HWND>(lParam), static_cast<SalFrameStyleFlags>(wParam)) )
+        CASE_NOYIELDLOCK_RESULT( SAL_MSG_RECREATEHWND, ImplSalReCreateHWND(
+            reinterpret_cast<HWND>(wParam), reinterpret_cast<HWND>(lParam), false) )
+        CASE_NOYIELDLOCK_RESULT( SAL_MSG_RECREATECHILDHWND, ImplSalReCreateHWND(
+            reinterpret_cast<HWND>(wParam), reinterpret_cast<HWND>(lParam), true) )
+        CASE_NOYIELDLOCK( SAL_MSG_DESTROYFRAME, delete reinterpret_cast<SalFrame*>(lParam) )
+
+        case SAL_MSG_DESTROYHWND:
+            // We only destroy the native window here. We do NOT destroy the SalFrame contained
+            // in the structure (GetWindowPtr()).
+            if (DestroyWindow(reinterpret_cast<HWND>(lParam)) == 0)
+            {
+                OSL_FAIL("DestroyWindow failed!");
+                // Failure: We remove the SalFrame from the window structure. So we avoid that
+                // the window structure may contain an invalid pointer, once the SalFrame is deleted.
+                SetWindowPtr(reinterpret_cast<HWND>(lParam), nullptr);
+            }
+            break;
+
+        CASE_NOYIELDLOCK_RESULT( SAL_MSG_CREATEOBJECT, ImplSalCreateObject(
+            GetSalData()->mpInstance, reinterpret_cast<WinSalFrame*>(lParam)) )
+        CASE_NOYIELDLOCK( SAL_MSG_DESTROYOBJECT, delete reinterpret_cast<SalObject*>(lParam) )
+        CASE_NOYIELDLOCK_RESULT( SAL_MSG_GETCACHEDDC, GetDCEx(
+            reinterpret_cast<HWND>(wParam), nullptr, DCX_CACHE) )
+        CASE_NOYIELDLOCK( SAL_MSG_RELEASEDC, ReleaseDC(
+            reinterpret_cast<HWND>(wParam), reinterpret_cast<HDC>(lParam)) )
+
+        case SAL_MSG_TIMER_CALLBACK:
+            assert( pTimer != nullptr );
+            pTimer->ImplHandleTimerEvent( wParam );
+            break;
+
+        case WM_TIMER:
+            assert( pTimer != nullptr );
+            pTimer->ImplHandle_WM_TIMER( wParam );
+            break;
+
+        case SAL_MSG_FORCE_REAL_TIMER:
+            assert(pTimer != nullptr);
+            pTimer->SetForceRealTimer(true);
+            break;
+
+        case SAL_MSG_DUMMY:
+            break;
+
+        default:
+            rDef = true;
+            break;
+    }
+
+    return nRet;
+}
+
+#undef CASE_NOYIELDLOCK
+#undef CASE_NOYIELDLOCK_RESULT
+
+LRESULT CALLBACK SalComWndProcW( HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam )
+{
+    bool bDef = false;
+    LRESULT nRet = 0;
+    __try
+    {
+        nRet = SalComWndProc( hWnd, nMsg, wParam, lParam, bDef );
+    }
+    __except(WinSalInstance::WorkaroundExceptionHandlingInUSER32Lib(GetExceptionCode(), GetExceptionInformation()))
+    {
+    }
+    if ( bDef )
+    {
+        if ( !ImplHandleGlobalMsg( hWnd, nMsg, wParam, lParam, nRet ) )
+            nRet = DefWindowProcW( hWnd, nMsg, wParam, lParam );
+    }
+    return nRet;
+}
+
+bool WinSalInstance::AnyInput( VclInputFlags nType )
+{
+    if ( nType & VclInputFlags::TIMER )
+    {
+        const WinSalTimer* pTimer = static_cast<WinSalTimer*>( ImplGetSVData()->maSchedCtx.mpSalTimer );
+        if ( pTimer && pTimer->HasTimerElapsed() )
+            return true;
+    }
+
+    // Note: Do not use PeekMessage(), despite the name it may dispatch events,
+    // even with PM_NOREMOVE specified, which may lead to unwanted recursion.
+
+    if ( (nType & VCL_INPUT_ANY) == VCL_INPUT_ANY )
+    {
+        // revert bugfix for #108919# which never reported timeouts when called from the timer handler
+        // which made the application completely unresponsive during background formatting
+        if ( GetQueueStatus( QS_ALLEVENTS ))
+            return true;
+    }
+    else
+    {
+        UINT flags = 0;
+
+        // This code previously considered modifier keys as OTHER,
+        // but that makes this hard to do without PeekMessage,
+        // is inconsistent with the X11 backend, and I see no good reason.
+        if ( nType & VclInputFlags::KEYBOARD )
+            flags |= QS_KEY;
+
+        if ( nType & VclInputFlags::MOUSE )
+            flags |= QS_MOUSE;
+
+        if ( nType & VclInputFlags::PAINT )
+            flags |= QS_PAINT;
+
+        if ( nType & VclInputFlags::TIMER )
+            flags |= QS_TIMER;
+
+        if( nType & VclInputFlags::OTHER )
+            flags |= QS_ALLEVENTS & ~QS_KEY & ~QS_MOUSE & ~QS_PAINT & ~QS_TIMER;
+
+        if( GetQueueStatus( flags ))
+            return true;
+    }
+
+    return false;
+}
+
+SalFrame* WinSalInstance::CreateChildFrame( SystemParentData* pSystemParentData, SalFrameStyleFlags nSalFrameStyle )
+{
+    // to switch to Main-Thread
+    return reinterpret_cast<SalFrame*>(static_cast<sal_IntPtr>(SendMessageW( mhComWnd, SAL_MSG_CREATEFRAME, static_cast<WPARAM>(nSalFrameStyle), reinterpret_cast<LPARAM>(pSystemParentData->hWnd) )));
+}
+
+SalFrame* WinSalInstance::CreateFrame( SalFrame* pParent, SalFrameStyleFlags nSalFrameStyle )
+{
+    // to switch to Main-Thread
+    HWND hWndParent;
+    if ( pParent )
+        hWndParent = static_cast<WinSalFrame*>(pParent)->mhWnd;
+    else
+        hWndParent = nullptr;
+    return reinterpret_cast<SalFrame*>(static_cast<sal_IntPtr>(SendMessageW( mhComWnd, SAL_MSG_CREATEFRAME, static_cast<WPARAM>(nSalFrameStyle), reinterpret_cast<LPARAM>(hWndParent) )));
+}
+
+void WinSalInstance::DestroyFrame( SalFrame* pFrame )
+{
+    OpenGLContext::prepareForYield();
+    SendMessageW( mhComWnd, SAL_MSG_DESTROYFRAME, 0, reinterpret_cast<LPARAM>(pFrame) );
+}
+
+SalObject* WinSalInstance::CreateObject( SalFrame* pParent,
+                                         SystemWindowData* /*pWindowData*/, // SystemWindowData meaningless on Windows
+                                         bool /*bShow*/ )
+{
+    // to switch to Main-Thread
+    return reinterpret_cast<SalObject*>(static_cast<sal_IntPtr>(SendMessageW( mhComWnd, SAL_MSG_CREATEOBJECT, 0, reinterpret_cast<LPARAM>(static_cast<WinSalFrame*>(pParent)) )));
+}
+
+void WinSalInstance::DestroyObject( SalObject* pObject )
+{
+    SendMessageW( mhComWnd, SAL_MSG_DESTROYOBJECT, 0, reinterpret_cast<LPARAM>(pObject) );
+}
+
+OUString WinSalInstance::GetConnectionIdentifier()
+{
+    return OUString();
+}
+
+/** Add a file to the system shells recent document list if there is any.
+      This function may have no effect under Unix because there is no
+      standard API among the different desktop managers.
+
+      @param aFileUrl
+                The file url of the document.
+*/
+void WinSalInstance::AddToRecentDocumentList(const OUString& rFileUrl, const OUString& /*rMimeType*/, const OUString& rDocumentService)
+{
+    if (Application::IsHeadlessModeEnabled())
+        return;
+
+    OUString system_path;
+    osl::FileBase::RC rc = osl::FileBase::getSystemPathFromFileURL(rFileUrl, system_path);
+
+    OSL_ENSURE(osl::FileBase::E_None == rc, "Invalid file url");
+
+    if (osl::FileBase::E_None == rc)
+    {
+        IShellItem* pShellItem = nullptr;
+
+        HRESULT hr = SHCreateItemFromParsingName(o3tl::toW(system_path.getStr()), nullptr, IID_PPV_ARGS(&pShellItem));
+
+        if ( SUCCEEDED(hr) && pShellItem )
+        {
+            OUString sApplicationName;
+
+            if ( rDocumentService == "com.sun.star.text.TextDocument" ||
+                 rDocumentService == "com.sun.star.text.GlobalDocument" ||
+                 rDocumentService == "com.sun.star.text.WebDocument" ||
+                 rDocumentService == "com.sun.star.xforms.XMLFormDocument" )
+                sApplicationName = "Writer";
+            else if ( rDocumentService == "com.sun.star.sheet.SpreadsheetDocument" ||
+                 rDocumentService == "com.sun.star.chart2.ChartDocument" )
+                sApplicationName = "Calc";
+            else if ( rDocumentService == "com.sun.star.presentation.PresentationDocument" )
+                sApplicationName = "Impress";
+            else if ( rDocumentService == "com.sun.star.drawing.DrawingDocument" )
+                sApplicationName = "Draw";
+            else if ( rDocumentService == "com.sun.star.formula.FormulaProperties" )
+                sApplicationName = "Math";
+            else if ( rDocumentService == "com.sun.star.sdb.DatabaseDocument" ||
+                 rDocumentService == "com.sun.star.sdb.OfficeDatabaseDocument" ||
+                 rDocumentService == "com.sun.star.sdb.RelationDesign" ||
+                 rDocumentService == "com.sun.star.sdb.QueryDesign" ||
+                 rDocumentService == "com.sun.star.sdb.TableDesign" ||
+                 rDocumentService == "com.sun.star.sdb.DataSourceBrowser" )
+                sApplicationName = "Base";
+
+            if ( !sApplicationName.isEmpty() )
+            {
+                OUString sApplicationID("TheDocumentFoundation.LibreOffice." + sApplicationName);
+
+                SHARDAPPIDINFO info;
+                info.psi = pShellItem;
+                info.pszAppID = o3tl::toW(sApplicationID.getStr());
+
+                SHAddToRecentDocs ( SHARD_APPIDINFO, &info );
+                return;
+            }
+        }
+        // For whatever reason, we could not use the SHARD_APPIDINFO semantics
+        SHAddToRecentDocs(SHARD_PATHW, system_path.getStr());
+    }
+}
+
+SalTimer* WinSalInstance::CreateSalTimer()
+{
+    return new WinSalTimer();
+}
+
+std::shared_ptr<SalBitmap> WinSalInstance::CreateSalBitmap()
+{
+#if HAVE_FEATURE_SKIA
+    if (SkiaHelper::isVCLSkiaEnabled())
+        return std::make_shared<SkiaSalBitmap>();
+    else
+#endif
+        return std::make_shared<WinSalBitmap>();
+}
+
+int WinSalInstance::WorkaroundExceptionHandlingInUSER32Lib(int, LPEXCEPTION_POINTERS pExceptionInfo)
+{
+    // Decide if an exception is a c++ (mostly UNO) exception or a process violation.
+    // Depending on this information we pass process violations directly to our signal handler ...
+    // and c++ (UNO) exceptions are sended to the following code on the current stack.
+    // Problem behind: user32.dll sometime consumes exceptions/process violations .-)
+    // see also #112221#
+
+    static const DWORD EXCEPTION_MSC_CPP_EXCEPTION = 0xE06D7363;
+
+    if (pExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_MSC_CPP_EXCEPTION)
+        return EXCEPTION_CONTINUE_SEARCH;
+
+    return UnhandledExceptionFilter( pExceptionInfo );
+}
+
+typedef LONG NTSTATUS;
+typedef NTSTATUS(WINAPI* RtlGetVersion_t)(PRTL_OSVERSIONINFOW);
+constexpr NTSTATUS STATUS_SUCCESS = 0x00000000;
+
+OUString WinSalInstance::getOSVersion()
+{
+    OUStringBuffer aVer(50); // capacity for string like "Windows 6.1 Service Pack 1 build 7601"
+    aVer.append("Windows ");
+    // GetVersion(Ex) and VersionHelpers (based on VerifyVersionInfo) API are
+    // subject to manifest-based behavior since Windows 8.1, so give wrong results.
+    // Another approach would be to use NetWkstaGetInfo, but that has some small
+    // reported delays (some milliseconds), and might get slower in domains with
+    // poor network connections.
+    // So go with a solution described at https://msdn.microsoft.com/en-us/library/ms724429
+    bool bHaveVerFromKernel32 = false;
+    if (HMODULE h_kernel32 = GetModuleHandleW(L"kernel32.dll"))
+    {
+        wchar_t szPath[MAX_PATH];
+        DWORD dwCount = GetModuleFileNameW(h_kernel32, szPath, SAL_N_ELEMENTS(szPath));
+        if (dwCount != 0 && dwCount < SAL_N_ELEMENTS(szPath))
+        {
+            dwCount = GetFileVersionInfoSizeW(szPath, nullptr);
+            if (dwCount != 0)
+            {
+                std::unique_ptr<char[]> ver(new char[dwCount]);
+                if (GetFileVersionInfoW(szPath, 0, dwCount, ver.get()) != FALSE)
+                {
+                    void* pBlock = nullptr;
+                    UINT dwBlockSz = 0;
+                    if (VerQueryValueW(ver.get(), L"\\", &pBlock, &dwBlockSz) != FALSE && dwBlockSz >= sizeof(VS_FIXEDFILEINFO))
+                    {
+                        VS_FIXEDFILEINFO* vi1 = static_cast<VS_FIXEDFILEINFO*>(pBlock);
+                        aVer.append(OUString::number(HIWORD(vi1->dwProductVersionMS)) + "."
+                                    + OUString::number(LOWORD(vi1->dwProductVersionMS)));
+                        bHaveVerFromKernel32 = true;
+                    }
+                }
+            }
+        }
+    }
+    // Now use RtlGetVersion (which is not subject to deprecation for GetVersion(Ex) API)
+    // to get build number and SP info
+    bool bHaveVerFromRtlGetVersion = false;
+    if (HMODULE h_ntdll = GetModuleHandleW(L"ntdll.dll"))
+    {
+        if (auto RtlGetVersion
+            = reinterpret_cast<RtlGetVersion_t>(GetProcAddress(h_ntdll, "RtlGetVersion")))
+        {
+            RTL_OSVERSIONINFOW vi2{}; // initialize with zeroes - a better alternative to memset
+            vi2.dwOSVersionInfoSize = sizeof(vi2);
+            if (STATUS_SUCCESS == RtlGetVersion(&vi2))
+            {
+                if (!bHaveVerFromKernel32) // we failed above; let's hope this would be useful
+                    aVer.append(OUString::number(vi2.dwMajorVersion) + "."
+                                + OUString::number(vi2.dwMinorVersion));
+                aVer.append(" ");
+                if (vi2.szCSDVersion[0])
+                    aVer.append(OUString::Concat(o3tl::toU(vi2.szCSDVersion)) + " ");
+                aVer.append("Build " + OUString::number(vi2.dwBuildNumber));
+                bHaveVerFromRtlGetVersion = true;
+            }
+        }
+    }
+    if (!bHaveVerFromKernel32 && !bHaveVerFromRtlGetVersion)
+        aVer.append("unknown");
+    return aVer.makeStringAndClear();
+}
+
+void WinSalInstance::BeforeAbort(const OUString&, bool)
+{
+    ImplFreeSalGDI();
+}
+
+css::uno::Reference<css::uno::XInterface> WinSalInstance::ImplCreateDragSource(const SystemEnvData* pSysEnv)
+{
+    return vcl::OleDnDHelper(new DragSource(comphelper::getProcessComponentContext()),
+                             reinterpret_cast<sal_IntPtr>(pSysEnv->hWnd), vcl::DragOrDrop::Drag);
+}
+
+css::uno::Reference<css::uno::XInterface> WinSalInstance::ImplCreateDropTarget(const SystemEnvData* pSysEnv)
+{
+    return vcl::OleDnDHelper(new DropTarget(comphelper::getProcessComponentContext()),
+                             reinterpret_cast<sal_IntPtr>(pSysEnv->hWnd), vcl::DragOrDrop::Drop);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/win/app/salshl.cxx b/vcl/win/app/salshl.cxx
new file mode 100644
index 000000000..5619ece1f
--- /dev/null
+++ b/vcl/win/app/salshl.cxx
@@ -0,0 +1,112 @@
+/* -*- 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 .
+ */
+
+#include <svsys.h>
+#include <sal/log.hxx>
+#include <win/saldata.hxx>
+
+SalShlData aSalShlData;
+
+extern "C" BOOL WINAPI DllMain(HINSTANCE hInst, DWORD nReason, LPVOID)
+{
+    if ( nReason == DLL_PROCESS_ATTACH )
+        aSalShlData.mhInst = hInst;
+    return 1;
+}
+
+HCURSOR ImplLoadSalCursor( int nId )
+{
+    SAL_WARN_IF( !aSalShlData.mhInst, "vcl", "no DLL instance handle" );
+
+    HCURSOR hCursor = LoadCursorW( aSalShlData.mhInst, MAKEINTRESOURCEW( nId ) );
+
+    SAL_WARN_IF( !hCursor, "vcl", "cursor not found in sal resource" );
+
+    return hCursor;
+}
+
+HBITMAP ImplLoadSalBitmap( int nId )
+{
+    SAL_WARN_IF( !aSalShlData.mhInst, "vcl", "no DLL instance handle" );
+
+    HBITMAP hBitmap = LoadBitmapW( aSalShlData.mhInst, MAKEINTRESOURCEW( nId ) );
+
+    SAL_WARN_IF( !hBitmap, "vcl", "bitmap not found in sal resource" );
+
+    return hBitmap;
+}
+
+bool ImplLoadSalIcon( int nId, HICON& rIcon, HICON& rSmallIcon )
+{
+    SAL_WARN_IF( !aSalShlData.mhInst, "vcl", "no DLL instance handle" );
+
+    SalData* pSalData = GetSalData();
+
+    // check the cache first
+    SalIcon *pSalIcon = pSalData->mpFirstIcon;
+    while( pSalIcon )
+    {
+        if( pSalIcon->nId != nId )
+            pSalIcon = pSalIcon->pNext;
+        else
+        {
+            rIcon       = pSalIcon->hIcon;
+            rSmallIcon  = pSalIcon->hSmallIcon;
+            return (rSmallIcon != nullptr);
+        }
+    }
+
+    // Try at first to load the icons from the application exe file
+    rIcon = static_cast<HICON>(LoadImageW( pSalData->mhInst, MAKEINTRESOURCEW( nId ),
+                                           IMAGE_ICON, GetSystemMetrics( SM_CXICON ), GetSystemMetrics( SM_CYICON ),
+                                           LR_DEFAULTCOLOR ));
+    if ( !rIcon )
+    {
+        // If the application don't provide these icons, then we try
+        // to load the icon from the VCL resource
+        rIcon = static_cast<HICON>(LoadImageW( aSalShlData.mhInst, MAKEINTRESOURCEW( nId ),
+                                           IMAGE_ICON, GetSystemMetrics( SM_CXICON ), GetSystemMetrics( SM_CYICON ),
+                                           LR_DEFAULTCOLOR ));
+        if ( rIcon )
+        {
+            rSmallIcon = static_cast<HICON>(LoadImageW( aSalShlData.mhInst, MAKEINTRESOURCEW( nId ),
+                                           IMAGE_ICON, GetSystemMetrics( SM_CXSMICON ), GetSystemMetrics( SM_CYSMICON ),
+                                           LR_DEFAULTCOLOR ));
+        }
+        else
+            rSmallIcon = nullptr;
+    }
+    else
+    {
+        rSmallIcon = static_cast<HICON>(LoadImageW( pSalData->mhInst, MAKEINTRESOURCEW( nId ),
+                                       IMAGE_ICON, GetSystemMetrics( SM_CXSMICON ), GetSystemMetrics( SM_CYSMICON ),
+                                       LR_DEFAULTCOLOR ));
+    }
+
+    if( rIcon )
+    {
+        // add to icon cache
+        pSalData->mpFirstIcon = new SalIcon{
+            nId, rIcon, rSmallIcon, pSalData->mpFirstIcon};
+    }
+
+    return (rSmallIcon != nullptr);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/win/app/saltimer.cxx b/vcl/win/app/saltimer.cxx
new file mode 100644
index 000000000..1ccab54e9
--- /dev/null
+++ b/vcl/win/app/saltimer.cxx
@@ -0,0 +1,201 @@
+/* -*- 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 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include <tools/time.hxx>
+
+#include <svsys.h>
+#include <win/saldata.hxx>
+#include <win/saltimer.h>
+#include <win/salinst.h>
+
+void CALLBACK SalTimerProc(PVOID pParameter, BOOLEAN bTimerOrWaitFired);
+
+// See http://msdn.microsoft.com/en-us/library/windows/desktop/ms687003%28v=vs.85%29.aspx
+// (and related pages) for details about the Timer Queues.
+
+// in order to prevent concurrent execution of ImplSalStartTimer and double
+// deletion of timer (which is extremely likely, given that
+// INVALID_HANDLE_VALUE waits for the callback to run on the main thread),
+// this must run on the main thread too
+void WinSalTimer::ImplStop()
+{
+    SalData *const pSalData = GetSalData();
+    const WinSalInstance *pInst = pSalData->mpInstance;
+    assert( !pInst || pSalData->mnAppThreadId == GetCurrentThreadId() );
+
+    if ( m_bSetTimerRunning )
+    {
+        m_bSetTimerRunning = false;
+        KillTimer( pInst->mhComWnd, m_aWmTimerId );
+    }
+    m_bDirectTimeout = false;
+
+    const HANDLE hTimer = m_nTimerId;
+    if ( nullptr == hTimer )
+        return;
+
+    m_nTimerId = nullptr;
+    DeleteTimerQueueTimer( nullptr, hTimer, INVALID_HANDLE_VALUE );
+    // Keep InvalidateEvent after DeleteTimerQueueTimer, because the event id
+    // is set in SalTimerProc, which DeleteTimerQueueTimer will finish or cancel.
+    InvalidateEvent();
+}
+
+void WinSalTimer::ImplStart( sal_uInt64 nMS )
+{
+#if !defined NDEBUG
+    SalData* pSalData = GetSalData();
+    assert( !pSalData->mpInstance || pSalData->mnAppThreadId == GetCurrentThreadId() );
+#endif
+
+    // DueTime parameter is a DWORD, which is always an unsigned 32bit
+    if (nMS > SAL_MAX_UINT32)
+        nMS = SAL_MAX_UINT32;
+
+    // cannot change a one-shot timer, so delete it and create a new one
+    ImplStop();
+
+    // directly indicate an elapsed timer
+    m_bDirectTimeout = ( 0 == nMS );
+    // probably WT_EXECUTEONLYONCE is not needed, but it enforces Period
+    // to be 0 and should not hurt; also see
+    // https://www.microsoft.com/msj/0499/pooling/pooling.aspx
+    if ( !m_bDirectTimeout )
+        CreateTimerQueueTimer(&m_nTimerId, nullptr, SalTimerProc, this,
+                              nMS, 0, WT_EXECUTEINTIMERTHREAD | WT_EXECUTEONLYONCE);
+    else if ( m_bForceRealTimer )
+    {
+        // so we don't block the nested message queue in move and resize
+        // with posted 0ms SAL_MSG_TIMER_CALLBACK messages
+        SetTimer( GetSalData()->mpInstance->mhComWnd, m_aWmTimerId,
+                  USER_TIMER_MINIMUM, nullptr );
+        m_bSetTimerRunning = true;
+    }
+    // we don't need any wakeup message, as this code can just run in the
+    // main thread!
+}
+
+WinSalTimer::WinSalTimer()
+    : m_nTimerId( nullptr )
+    , m_bDirectTimeout( false )
+    , m_bForceRealTimer( false )
+    , m_bSetTimerRunning( false )
+{
+}
+
+WinSalTimer::~WinSalTimer()
+{
+    Stop();
+}
+
+void WinSalTimer::Start( sal_uInt64 nMS )
+{
+    WinSalInstance *pInst = GetSalData()->mpInstance;
+    if ( pInst && !pInst->IsMainThread() )
+    {
+        bool const ret = PostMessageW(pInst->mhComWnd,
+            SAL_MSG_STARTTIMER, 0, static_cast<LPARAM>(tools::Time::GetSystemTicks()) + nMS);
+        SAL_WARN_IF(!ret, "vcl", "ERROR: PostMessage() failed!");
+    }
+    else
+        ImplStart( nMS );
+}
+
+void WinSalTimer::Stop()
+{
+    WinSalInstance *pInst = GetSalData()->mpInstance;
+    if ( pInst && !pInst->IsMainThread() )
+    {
+        bool const ret = PostMessageW(pInst->mhComWnd,
+            SAL_MSG_STOPTIMER, 0, 0);
+        SAL_WARN_IF(!ret, "vcl", "ERROR: PostMessage() failed!");
+    }
+    else
+        ImplStop();
+}
+
+/**
+ * This gets invoked from a Timer Queue thread.
+ * Don't acquire the SolarMutex to avoid deadlocks.
+ */
+void CALLBACK SalTimerProc(PVOID data, BOOLEAN)
+{
+    __try
+    {
+        WinSalTimer *pTimer = static_cast<WinSalTimer*>( data );
+        bool const ret = PostMessageW(
+            GetSalData()->mpInstance->mhComWnd, SAL_MSG_TIMER_CALLBACK,
+            static_cast<WPARAM>(pTimer->GetNextEventVersion()), 0 );
+#if OSL_DEBUG_LEVEL > 0
+        if (!ret) // SEH prevents using SAL_WARN here?
+            fputs("ERROR: PostMessage() failed!\n", stderr);
+#endif
+    }
+    __except(WinSalInstance::WorkaroundExceptionHandlingInUSER32Lib(GetExceptionCode(), GetExceptionInformation()))
+    {
+    }
+}
+
+void WinSalTimer::ImplHandleElapsedTimer()
+{
+    // Test for MouseLeave
+    SalTestMouseLeave();
+
+    m_bDirectTimeout = false;
+    ImplSalYieldMutexAcquireWithWait();
+    CallCallback();
+    ImplSalYieldMutexRelease();
+}
+
+void WinSalTimer::ImplHandleTimerEvent( const WPARAM aWPARAM )
+{
+    assert( aWPARAM <= SAL_MAX_INT32 );
+    if ( !IsValidEventVersion( static_cast<sal_Int32>( aWPARAM ) ) )
+        return;
+
+    ImplHandleElapsedTimer();
+}
+
+void WinSalTimer::SetForceRealTimer( const bool bVal )
+{
+    if ( m_bForceRealTimer == bVal )
+        return;
+
+    m_bForceRealTimer = bVal;
+
+    // we need a real timer, as m_bDirectTimeout won't be processed
+    if ( bVal && m_bDirectTimeout )
+        Start( 0 );
+}
+
+void WinSalTimer::ImplHandle_WM_TIMER( const WPARAM aWPARAM )
+{
+    assert( m_aWmTimerId == aWPARAM );
+    if ( !(m_aWmTimerId == aWPARAM && m_bSetTimerRunning) )
+        return;
+
+    m_bSetTimerRunning = false;
+    KillTimer( GetSalData()->mpInstance->mhComWnd, m_aWmTimerId );
+    ImplHandleElapsedTimer();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */