1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
/* -*- 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 <Qt5Instance.hxx>
#include <Qt5Instance.moc>

#include <com/sun/star/lang/IllegalArgumentException.hpp>

#include <Qt5Bitmap.hxx>
#include <Qt5Clipboard.hxx>
#include <Qt5Data.hxx>
#include <Qt5DragAndDrop.hxx>
#include <Qt5FilePicker.hxx>
#include <Qt5Frame.hxx>
#include <Qt5Menu.hxx>
#include <Qt5Object.hxx>
#include <Qt5OpenGLContext.hxx>
#include "Qt5SvpVirtualDevice.hxx"
#include <Qt5System.hxx>
#include <Qt5Timer.hxx>
#include <Qt5VirtualDevice.hxx>

#include <headless/svpvd.hxx>

#include <QtCore/QAbstractEventDispatcher>
#include <QtCore/QThread>
#include <QtWidgets/QApplication>
#include <QtWidgets/QWidget>

#include <vclpluginapi.h>
#include <tools/debug.hxx>
#include <comphelper/flagguard.hxx>
#include <sal/log.hxx>
#include <osl/process.h>
#include <unx/gstsink.hxx>
#include <headless/svpbmp.hxx>

#include <mutex>
#include <condition_variable>

/// TODO: not much Qt5 specific here? could be generalised, esp. for OSX...
/// this subclass allows for the transfer of a closure for running on the main
/// thread, to handle all the thread affine stuff in Qt5; the SolarMutex is
/// "loaned" to the main thread for the execution of the closure.
/// @note it doesn't work to just use "emit" and signals/slots to move calls to
/// the main thread, because the other thread has the SolarMutex; the other
/// thread (typically) cannot release SolarMutex, because then the main thread
/// will handle all sorts of events and whatnot; this design ensures that the
/// main thread only runs the passed closure (unless the closure releases
/// SolarMutex itself, which should probably be avoided).
class Qt5YieldMutex : public SalYieldMutex
{
public:
    /// flag only accessed on main thread:
    /// main thread has "borrowed" SolarMutex from another thread
    bool m_bNoYieldLock = false;
    /// members for communication from non-main thread to main thread
    std::mutex m_RunInMainMutex;
    std::condition_variable m_InMainCondition;
    bool m_isWakeUpMain = false;
    std::function<void()> m_Closure; ///< code for main thread to run
    /// members for communication from main thread to non-main thread
    std::condition_variable m_ResultCondition;
    bool m_isResultReady = false;

    virtual bool IsCurrentThread() const override;
    virtual void doAcquire(sal_uInt32 nLockCount) override;
    virtual sal_uInt32 doRelease(bool const bUnlockAll) override;
};

bool Qt5YieldMutex::IsCurrentThread() const
{
    auto const* pSalInst(static_cast<Qt5Instance const*>(GetSalData()->m_pInstance));
    assert(pSalInst);
    if (pSalInst->IsMainThread() && m_bNoYieldLock)
    {
        return true; // main thread has borrowed SolarMutex
    }
    return SalYieldMutex::IsCurrentThread();
}

void Qt5YieldMutex::doAcquire(sal_uInt32 nLockCount)
{
    auto const* pSalInst(static_cast<Qt5Instance const*>(GetSalData()->m_pInstance));
    assert(pSalInst);
    if (!pSalInst->IsMainThread())
    {
        SalYieldMutex::doAcquire(nLockCount);
        return;
    }
    if (m_bNoYieldLock)
    {
        return; // special case for main thread: borrowed from other thread
    }
    do // main thread acquire...
    {
        std::function<void()> func; // copy of closure on thread stack
        {
            std::unique_lock<std::mutex> g(m_RunInMainMutex);
            if (m_aMutex.tryToAcquire())
            {
                // if there's a closure, the other thread holds m_aMutex
                assert(!m_Closure);
                m_isWakeUpMain = false;
                --nLockCount; // have acquired once!
                ++m_nCount;
                break;
            }
            m_InMainCondition.wait(g, [this]() { return m_isWakeUpMain; });
            m_isWakeUpMain = false;
            std::swap(func, m_Closure);
        }
        if (func)
        {
            assert(!m_bNoYieldLock);
            m_bNoYieldLock = true; // execute closure with borrowed SolarMutex
            func();
            m_bNoYieldLock = false;
            std::unique_lock<std::mutex> g(m_RunInMainMutex);
            assert(!m_isResultReady);
            m_isResultReady = true;
            m_ResultCondition.notify_all(); // unblock other thread
        }
    } while (true);
    SalYieldMutex::doAcquire(nLockCount);
}

sal_uInt32 Qt5YieldMutex::doRelease(bool const bUnlockAll)
{
    auto const* pSalInst(static_cast<Qt5Instance const*>(GetSalData()->m_pInstance));
    assert(pSalInst);
    if (pSalInst->IsMainThread() && m_bNoYieldLock)
    {
        return 1; // dummy value
    }

    std::unique_lock<std::mutex> g(m_RunInMainMutex);
    // read m_nCount before doRelease (it's guarded by m_aMutex)
    bool const isReleased(bUnlockAll || m_nCount == 1);
    sal_uInt32 nCount = SalYieldMutex::doRelease(bUnlockAll);
    if (isReleased && !pSalInst->IsMainThread())
    {
        m_isWakeUpMain = true;
        m_InMainCondition.notify_all(); // unblock main thread
    }
    return nCount;
}

// this could be abstracted to be independent of Qt5 by passing in the
// event-trigger as another function parameter...
// it could also be a template of the return type, then it could return the
// result of func... but then how to handle the result in doAcquire?
void Qt5Instance::RunInMainThread(std::function<void()> func)
{
    DBG_TESTSOLARMUTEX();
    if (IsMainThread())
    {
        func();
        return;
    }

    Qt5YieldMutex* const pMutex(static_cast<Qt5YieldMutex*>(GetYieldMutex()));
    {
        std::unique_lock<std::mutex> g(pMutex->m_RunInMainMutex);
        assert(!pMutex->m_Closure);
        pMutex->m_Closure = func;
        // unblock main thread in case it is blocked on condition
        pMutex->m_isWakeUpMain = true;
        pMutex->m_InMainCondition.notify_all();
    }
    // wake up main thread in case it is blocked on event queue
    // TriggerUserEventProcessing() appears to be insufficient in case the
    // main thread does QEventLoop::WaitForMoreEvents
    Q_EMIT ImplRunInMainSignal();
    {
        std::unique_lock<std::mutex> g(pMutex->m_RunInMainMutex);
        pMutex->m_ResultCondition.wait(g, [pMutex]() { return pMutex->m_isResultReady; });
        pMutex->m_isResultReady = false;
    }
}

void Qt5Instance::ImplRunInMain()
{
    SolarMutexGuard g; // trigger the dispatch code in Qt5YieldMutex::doAcquire
    (void)this; // suppress unhelpful [loplugin:staticmethods]; can't be static
}

Qt5Instance::Qt5Instance(std::unique_ptr<QApplication>& pQApp, bool bUseCairo)
    : SalGenericInstance(std::make_unique<Qt5YieldMutex>())
    , m_postUserEventId(-1)
    , m_bUseCairo(bUseCairo)
    , m_pQApplication(std::move(pQApp))
    , m_aUpdateStyleTimer("vcl::qt5 m_aUpdateStyleTimer")
    , m_bUpdateFonts(false)
{
    ImplSVData* pSVData = ImplGetSVData();
    if (bUseCairo)
        pSVData->maAppData.mxToolkitName = OUString("qt5+cairo");
    else
        pSVData->maAppData.mxToolkitName = OUString("qt5");

    m_postUserEventId = QEvent::registerEventType();

    // this one needs to be blocking, so that the handling in main thread
    // is processed before the thread emitting the signal continues
    connect(this, SIGNAL(ImplYieldSignal(bool, bool)), this, SLOT(ImplYield(bool, bool)),
            Qt::BlockingQueuedConnection);
    connect(this, &Qt5Instance::ImplRunInMainSignal, this, &Qt5Instance::ImplRunInMain,
            Qt::QueuedConnection); // no Blocking!

    // this one needs to be queued non-blocking
    // in order to have this event arriving to correct event processing loop
    connect(this, &Qt5Instance::deleteObjectLaterSignal, this,
            [](QObject* pObject) { Qt5Instance::deleteObjectLater(pObject); },
            Qt::QueuedConnection);

    m_aUpdateStyleTimer.SetTimeout(50);
    m_aUpdateStyleTimer.SetInvokeHandler(LINK(this, Qt5Instance, updateStyleHdl));
}

Qt5Instance::~Qt5Instance()
{
    // force freeing the QApplication before freeing the arguments,
    // as it uses references to the provided arguments!
    m_pQApplication.reset();
}

void Qt5Instance::AfterAppInit()
{
    // sets the default application icon on Wayland
    QGuiApplication::setDesktopFileName(QStringLiteral("libreoffice-startcenter.desktop"));
}

void Qt5Instance::deleteObjectLater(QObject* pObject) { pObject->deleteLater(); }

SalFrame* Qt5Instance::CreateChildFrame(SystemParentData* /*pParent*/, SalFrameStyleFlags nStyle)
{
    return new Qt5Frame(nullptr, nStyle, m_bUseCairo);
}

SalFrame* Qt5Instance::CreateFrame(SalFrame* pParent, SalFrameStyleFlags nStyle)
{
    assert(!pParent || dynamic_cast<Qt5Frame*>(pParent));
    return new Qt5Frame(static_cast<Qt5Frame*>(pParent), nStyle, m_bUseCairo);
}

void Qt5Instance::DestroyFrame(SalFrame* pFrame)
{
    if (pFrame)
    {
        assert(dynamic_cast<Qt5Frame*>(pFrame));
        Q_EMIT deleteObjectLaterSignal(static_cast<Qt5Frame*>(pFrame));
    }
}

SalObject* Qt5Instance::CreateObject(SalFrame* pParent, SystemWindowData*, bool bShow)
{
    assert(!pParent || dynamic_cast<Qt5Frame*>(pParent));
    return new Qt5Object(static_cast<Qt5Frame*>(pParent), bShow);
}

void Qt5Instance::DestroyObject(SalObject* pObject)
{
    if (pObject)
    {
        assert(dynamic_cast<Qt5Object*>(pObject));
        Q_EMIT deleteObjectLaterSignal(static_cast<Qt5Object*>(pObject));
    }
}

std::unique_ptr<SalVirtualDevice>
Qt5Instance::CreateVirtualDevice(SalGraphics* pGraphics, long& nDX, long& nDY, DeviceFormat eFormat,
                                 const SystemGraphicsData* /* pData */)
{
    if (m_bUseCairo)
    {
        SvpSalGraphics* pSvpSalGraphics = dynamic_cast<Qt5SvpGraphics*>(pGraphics);
        assert(pSvpSalGraphics);
        std::unique_ptr<SalVirtualDevice> pVD(
            new Qt5SvpVirtualDevice(eFormat, pSvpSalGraphics->getSurface()));
        pVD->SetSize(nDX, nDY);
        return pVD;
    }
    else
    {
        std::unique_ptr<SalVirtualDevice> pVD(new Qt5VirtualDevice(eFormat, 1));
        pVD->SetSize(nDX, nDY);
        return pVD;
    }
}

std::unique_ptr<SalMenu> Qt5Instance::CreateMenu(bool bMenuBar, Menu* pVCLMenu)
{
    std::unique_ptr<SalMenu> pRet;
    RunInMainThread([&pRet, bMenuBar, pVCLMenu]() {
        Qt5Menu* pSalMenu = new Qt5Menu(bMenuBar);
        pRet.reset(pSalMenu);
        pSalMenu->SetMenu(pVCLMenu);
    });
    assert(pRet);
    return pRet;
}

std::unique_ptr<SalMenuItem> Qt5Instance::CreateMenuItem(const SalItemParams& rItemData)
{
    return std::unique_ptr<SalMenuItem>(new Qt5MenuItem(&rItemData));
}

SalTimer* Qt5Instance::CreateSalTimer() { return new Qt5Timer(); }

SalSystem* Qt5Instance::CreateSalSystem() { return new Qt5System; }

std::shared_ptr<SalBitmap> Qt5Instance::CreateSalBitmap()
{
    if (m_bUseCairo)
        return std::make_shared<SvpSalBitmap>();
    else
        return std::make_shared<Qt5Bitmap>();
}

bool Qt5Instance::ImplYield(bool bWait, bool bHandleAllCurrentEvents)
{
    // Re-acquire the guard for user events when called via Q_EMIT ImplYieldSignal
    SolarMutexGuard aGuard;
    bool wasEvent = DispatchUserEvents(bHandleAllCurrentEvents);
    if (!bHandleAllCurrentEvents && wasEvent)
        return true;

    /**
     * Quoting the Qt docs: [QAbstractEventDispatcher::processEvents] processes
     * pending events that match flags until there are no more events to process.
     */
    SolarMutexReleaser aReleaser;
    QAbstractEventDispatcher* dispatcher = QAbstractEventDispatcher::instance(qApp->thread());
    if (bWait && !wasEvent)
        wasEvent = dispatcher->processEvents(QEventLoop::WaitForMoreEvents);
    else
        wasEvent = dispatcher->processEvents(QEventLoop::AllEvents) || wasEvent;
    return wasEvent;
}

bool Qt5Instance::DoYield(bool bWait, bool bHandleAllCurrentEvents)
{
    bool bWasEvent = false;
    if (qApp->thread() == QThread::currentThread())
    {
        bWasEvent = ImplYield(bWait, bHandleAllCurrentEvents);
        if (bWasEvent)
            m_aWaitingYieldCond.set();
    }
    else
    {
        {
            SolarMutexReleaser aReleaser;
            bWasEvent = Q_EMIT ImplYieldSignal(false, bHandleAllCurrentEvents);
        }
        if (!bWasEvent && bWait)
        {
            m_aWaitingYieldCond.reset();
            SolarMutexReleaser aReleaser;
            m_aWaitingYieldCond.wait();
            bWasEvent = true;
        }
    }
    return bWasEvent;
}

bool Qt5Instance::AnyInput(VclInputFlags /*nType*/) { return false; }

OUString Qt5Instance::GetConnectionIdentifier() { return OUString(); }

void Qt5Instance::AddToRecentDocumentList(const OUString&, const OUString&, const OUString&) {}

OpenGLContext* Qt5Instance::CreateOpenGLContext() { return new Qt5OpenGLContext; }

bool Qt5Instance::IsMainThread() const { return qApp->thread() == QThread::currentThread(); }

void Qt5Instance::TriggerUserEventProcessing()
{
    QApplication::postEvent(this, new QEvent(QEvent::Type(m_postUserEventId)));
}

void Qt5Instance::ProcessEvent(SalUserEvent aEvent)
{
    aEvent.m_pFrame->CallCallback(aEvent.m_nEvent, aEvent.m_pData);
}

Qt5FilePicker* Qt5Instance::createPicker(QFileDialog::FileMode eMode)
{
    if (!IsMainThread())
    {
        SolarMutexGuard g;
        Qt5FilePicker* pPicker;
        RunInMainThread(std::function([&, this]() { pPicker = createPicker(eMode); }));
        assert(pPicker);
        return pPicker;
    }

    return new Qt5FilePicker(eMode);
}

css::uno::Reference<css::ui::dialogs::XFilePicker2>
Qt5Instance::createFilePicker(const css::uno::Reference<css::uno::XComponentContext>&)
{
    return css::uno::Reference<css::ui::dialogs::XFilePicker2>(
        createPicker(QFileDialog::ExistingFile));
}

css::uno::Reference<css::ui::dialogs::XFolderPicker2>
Qt5Instance::createFolderPicker(const css::uno::Reference<css::uno::XComponentContext>&)
{
    return css::uno::Reference<css::ui::dialogs::XFolderPicker2>(
        createPicker(QFileDialog::Directory));
}

css::uno::Reference<css::uno::XInterface>
Qt5Instance::CreateClipboard(const css::uno::Sequence<css::uno::Any>& arguments)
{
    OUString sel;
    if (arguments.getLength() == 0)
    {
        sel = "CLIPBOARD";
    }
    else if (arguments.getLength() != 1 || !(arguments[0] >>= sel))
    {
        throw css::lang::IllegalArgumentException("bad Qt5Instance::CreateClipboard arguments",
                                                  css::uno::Reference<css::uno::XInterface>(), -1);
    }

    // This could also use RunInMain, but SolarMutexGuard is enough
    // since at this point we're not accessing the clipboard, just get the
    // accessor to the clipboard.
    SolarMutexGuard aGuard;

    auto it = m_aClipboards.find(sel);
    if (it != m_aClipboards.end())
        return it->second;

    css::uno::Reference<css::uno::XInterface> xClipboard = Qt5Clipboard::create(sel);
    if (xClipboard.is())
        m_aClipboards[sel] = xClipboard;

    return xClipboard;
}

css::uno::Reference<css::uno::XInterface> Qt5Instance::CreateDragSource()
{
    return css::uno::Reference<css::uno::XInterface>(
        static_cast<cppu::OWeakObject*>(new Qt5DragSource()));
}

css::uno::Reference<css::uno::XInterface> Qt5Instance::CreateDropTarget()
{
    return css::uno::Reference<css::uno::XInterface>(
        static_cast<cppu::OWeakObject*>(new Qt5DropTarget()));
}

IMPL_LINK_NOARG(Qt5Instance, updateStyleHdl, Timer*, void)
{
    SolarMutexGuard aGuard;
    SalFrame* pFrame = anyFrame();
    if (pFrame)
    {
        pFrame->CallCallback(SalEvent::SettingsChanged, nullptr);
        if (m_bUpdateFonts)
        {
            pFrame->CallCallback(SalEvent::FontChanged, nullptr);
            m_bUpdateFonts = false;
        }
    }
}

void Qt5Instance::UpdateStyle(bool bFontsChanged)
{
    if (bFontsChanged)
        m_bUpdateFonts = true;
    if (!m_aUpdateStyleTimer.IsActive())
        m_aUpdateStyleTimer.Start();
}

void* Qt5Instance::CreateGStreamerSink(const SystemChildWindow* pWindow)
{
#if ENABLE_GSTREAMER_1_0 && QT5_HAVE_GOBJECT
    auto pSymbol = gstElementFactoryNameSymbol();
    if (!pSymbol)
        return nullptr;

    const SystemEnvData* pEnvData = pWindow->GetSystemData();
    if (!pEnvData)
        return nullptr;

    OUString aPlatform = OUString::createFromAscii(pEnvData->pPlatformName);
    if (aPlatform != "wayland")
        return nullptr;

    GstElement* pVideosink = pSymbol("qwidget5videosink", "qwidget5videosink");
    if (pVideosink)
    {
        QWidget* pQWidget = static_cast<QWidget*>(pEnvData->pWidget);
        g_object_set(G_OBJECT(pVideosink), "widget", pQWidget, nullptr);
    }
    else
    {
        SAL_WARN("vcl.qt5", "Couldn't initialize qwidget5videosink."
                            " Video playback might not work as expected."
                            " Please install Qt5 packages for QtGStreamer.");
        // with no videosink explicitly set, GStreamer will open its own (misplaced) window(s) to display video
    }

    return pVideosink;
#else
    (void*)pWindow;
    return nullptr;
#endif
}

void Qt5Instance::AllocFakeCmdlineArgs(std::unique_ptr<char* []>& rFakeArgv,
                                       std::unique_ptr<int>& rFakeArgc,
                                       std::vector<FreeableCStr>& rFakeArgvFreeable)
{
    OString aVersion(qVersion());
    SAL_INFO("vcl.qt5", "qt version string is " << aVersion);

    const sal_uInt32 nParams = osl_getCommandArgCount();
    OString aDisplay;
    sal_uInt32 nDisplayValueIdx = 0;
    OUString aParam, aBin;

    for (sal_uInt32 nIdx = 0; nIdx < nParams; ++nIdx)
    {
        osl_getCommandArg(nIdx, &aParam.pData);
        if (aParam != "-display")
            continue;
        ++nIdx;
        nDisplayValueIdx = nIdx;
    }

    osl_getExecutableFile(&aParam.pData);
    osl_getSystemPathFromFileURL(aParam.pData, &aBin.pData);
    OString aExec = OUStringToOString(aBin, osl_getThreadTextEncoding());

    std::vector<FreeableCStr> aFakeArgvFreeable;
    aFakeArgvFreeable.reserve(4);
    aFakeArgvFreeable.emplace_back(strdup(aExec.getStr()));
    aFakeArgvFreeable.emplace_back(strdup("--nocrashhandler"));
    if (nDisplayValueIdx)
    {
        aFakeArgvFreeable.emplace_back(strdup("-display"));
        osl_getCommandArg(nDisplayValueIdx, &aParam.pData);
        aDisplay = OUStringToOString(aParam, osl_getThreadTextEncoding());
        aFakeArgvFreeable.emplace_back(strdup(aDisplay.getStr()));
    }
    rFakeArgvFreeable.swap(aFakeArgvFreeable);

    const int nFakeArgc = rFakeArgvFreeable.size();
    rFakeArgv.reset(new char*[nFakeArgc]);
    for (int i = 0; i < nFakeArgc; i++)
        rFakeArgv[i] = rFakeArgvFreeable[i].get();

    rFakeArgc.reset(new int);
    *rFakeArgc = nFakeArgc;
}

void Qt5Instance::MoveFakeCmdlineArgs(std::unique_ptr<char* []>& rFakeArgv,
                                      std::unique_ptr<int>& rFakeArgc,
                                      std::vector<FreeableCStr>& rFakeArgvFreeable)
{
    m_pFakeArgv = std::move(rFakeArgv);
    m_pFakeArgc = std::move(rFakeArgc);
    m_pFakeArgvFreeable.swap(rFakeArgvFreeable);
}

std::unique_ptr<QApplication> Qt5Instance::CreateQApplication(int& nArgc, char** pArgv)
{
    QApplication::setAttribute(Qt::AA_DisableHighDpiScaling);

    FreeableCStr session_manager;
    if (getenv("SESSION_MANAGER") != nullptr)
    {
        session_manager.reset(strdup(getenv("SESSION_MANAGER")));
        unsetenv("SESSION_MANAGER");
    }

    std::unique_ptr<QApplication> pQApp = std::make_unique<QApplication>(nArgc, pArgv);

    if (session_manager != nullptr)
    {
        // coverity[tainted_string] - trusted source for setenv
        setenv("SESSION_MANAGER", session_manager.get(), 1);
    }

    QApplication::setQuitOnLastWindowClosed(false);
    return pQApp;
}

extern "C" {
VCLPLUG_QT5_PUBLIC SalInstance* create_SalInstance()<--- The function 'create_SalInstance' is never used.
{
    static const bool bUseCairo = (nullptr != getenv("SAL_VCL_QT5_USE_CAIRO"));

    std::unique_ptr<char* []> pFakeArgv;
    std::unique_ptr<int> pFakeArgc;
    std::vector<FreeableCStr> aFakeArgvFreeable;
    Qt5Instance::AllocFakeCmdlineArgs(pFakeArgv, pFakeArgc, aFakeArgvFreeable);

    std::unique_ptr<QApplication> pQApp
        = Qt5Instance::CreateQApplication(*pFakeArgc, pFakeArgv.get());

    Qt5Instance* pInstance = new Qt5Instance(pQApp, bUseCairo);
    pInstance->MoveFakeCmdlineArgs(pFakeArgv, pFakeArgc, aFakeArgvFreeable);

    new Qt5Data(pInstance);

    return pInstance;
}
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */