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

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

1 files changed, 248 insertions, 0 deletions

diff --git a/slideshow/source/engine/screenupdater.cxx b/slideshow/source/engine/screenupdater.cxx
new file mode 100644
index 000000000..72768628d
--- /dev/null
+++ b/slideshow/source/engine/screenupdater.cxx
@@ -0,0 +1,248 @@
+/* -*- 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 <screenupdater.hxx>
+#include <listenercontainer.hxx>
+
+#include <osl/diagnose.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+#include <algorithm>
+
+namespace {
+    class UpdateLock : public ::slideshow::internal::ScreenUpdater::UpdateLock
+    {
+    public:
+        explicit UpdateLock (::slideshow::internal::ScreenUpdater& rUpdater);
+        virtual ~UpdateLock();
+        virtual void Activate() override;
+    private:
+        ::slideshow::internal::ScreenUpdater& mrUpdater;
+        bool mbIsActivated;
+    };
+}
+
+namespace slideshow::internal
+{
+    typedef std::vector<
+        std::pair<UnoViewSharedPtr,bool> > UpdateRequestVector;
+
+    struct ScreenUpdater::ImplScreenUpdater
+    {
+        /** List of registered ViewUpdaters, to consult for necessary
+            updates
+        */
+        ThreadUnsafeListenerContainer<
+            ViewUpdateSharedPtr,
+            std::vector<ViewUpdateSharedPtr> > maUpdaters;
+
+        /// Views that have been notified for update
+        UpdateRequestVector                    maViewUpdateRequests;
+
+        /// List of View. Used to issue screen updates on.
+        UnoViewContainer const&                mrViewContainer;
+
+        /// True, if a notifyUpdate() for all views has been issued.
+        bool                                   mbUpdateAllRequest;
+
+        /// True, if at least one notifyUpdate() call had bViewClobbered set
+        bool                                   mbViewClobbered;
+
+        /// The screen is updated only when mnLockCount==0
+        sal_Int32 mnLockCount;
+
+        explicit ImplScreenUpdater( UnoViewContainer const& rViewContainer ) :
+            maUpdaters(),
+            maViewUpdateRequests(),
+            mrViewContainer(rViewContainer),
+            mbUpdateAllRequest(false),
+            mbViewClobbered(false),
+            mnLockCount(0)
+        {}
+    };
+
+    ScreenUpdater::ScreenUpdater( UnoViewContainer const& rViewContainer ) :
+        mpImpl(new ImplScreenUpdater(rViewContainer) )
+    {
+    }
+
+    ScreenUpdater::~ScreenUpdater()
+    {
+        // outline because of pimpl
+    }
+
+    void ScreenUpdater::notifyUpdate()
+    {
+        mpImpl->mbUpdateAllRequest = true;
+    }
+
+    void ScreenUpdater::notifyUpdate( const UnoViewSharedPtr& rView,
+                                      bool                    bViewClobbered )
+    {
+        mpImpl->maViewUpdateRequests.emplace_back(rView, bViewClobbered );
+
+        if( bViewClobbered )
+            mpImpl->mbViewClobbered = true;
+    }
+
+    void ScreenUpdater::commitUpdates()
+    {
+        if (mpImpl->mnLockCount > 0)
+            return;
+
+        // cases:
+
+        // (a) no update necessary at all
+
+        // (b) no ViewUpdate-generated update
+        //     I. update all views requested -> for_each( mrViewContainer )
+        //    II. update some views requested -> for_each( maViewUpdateRequests )
+
+        // (c) ViewUpdate-triggered update - update all views
+
+
+        // any ViewUpdate-triggered updates?
+        const bool bViewUpdatesNeeded(
+            mpImpl->maUpdaters.apply(
+                std::mem_fn(&ViewUpdate::needsUpdate)) );
+
+        if( bViewUpdatesNeeded )
+        {
+            mpImpl->maUpdaters.applyAll(
+                std::mem_fn(&ViewUpdate::update) );
+        }
+
+        if( bViewUpdatesNeeded ||
+            mpImpl->mbUpdateAllRequest )
+        {
+            // unconditionally update all views
+            for( const auto& pView : mpImpl->mrViewContainer )
+            {
+                if( mpImpl->mbViewClobbered )
+                    pView->paintScreen();
+                else
+                    pView->updateScreen();
+            }
+        }
+        else if( !mpImpl->maViewUpdateRequests.empty() )
+        {
+            // update notified views only
+            for( const auto& rViewUpdateRequest : mpImpl->maViewUpdateRequests )
+            {
+                // TODO(P1): this is O(n^2) in the number of views, if
+                // lots of views notify updates.
+                const UnoViewVector::const_iterator aEndOfViews(
+                    mpImpl->mrViewContainer.end() );
+                UnoViewVector::const_iterator aFoundView;
+                if( (aFoundView=std::find(mpImpl->mrViewContainer.begin(),
+                                          aEndOfViews,
+                                          rViewUpdateRequest.first)) != aEndOfViews )
+                {
+                    if( rViewUpdateRequest.second )
+                        (*aFoundView)->paintScreen(); // force-paint
+                    else
+                        (*aFoundView)->updateScreen(); // update changes only
+                }
+            }
+        }
+
+        // done - clear requests
+        mpImpl->mbViewClobbered = false;
+        mpImpl->mbUpdateAllRequest = false;
+        UpdateRequestVector().swap( mpImpl->maViewUpdateRequests );
+    }
+
+    void ScreenUpdater::addViewUpdate( ViewUpdateSharedPtr const& rViewUpdate )
+    {
+        mpImpl->maUpdaters.add( rViewUpdate );
+    }
+
+    void ScreenUpdater::removeViewUpdate( ViewUpdateSharedPtr const& rViewUpdate )
+    {
+        mpImpl->maUpdaters.remove( rViewUpdate );
+    }
+
+    void ScreenUpdater::requestImmediateUpdate()
+    {
+        if (mpImpl->mnLockCount > 0)
+            return;
+
+        // TODO(F2): This will interfere with other updates, since it
+        // happens out-of-sync with main animation loop. Might cause
+        // artifacts.
+        for( auto const& pView : mpImpl->mrViewContainer )
+            pView->updateScreen();
+    }
+
+    void ScreenUpdater::lockUpdates()
+    {
+        ++mpImpl->mnLockCount;
+        OSL_ASSERT(mpImpl->mnLockCount>0);
+    }
+
+    void ScreenUpdater::unlockUpdates()
+    {
+        OSL_ASSERT(mpImpl->mnLockCount>0);
+        if (mpImpl->mnLockCount > 0)
+        {
+            --mpImpl->mnLockCount;
+            if (mpImpl->mnLockCount)
+                commitUpdates();
+        }
+    }
+
+    ::std::shared_ptr<ScreenUpdater::UpdateLock> ScreenUpdater::createLock()
+    {
+        return ::std::make_shared<::UpdateLock>(*this);
+    }
+
+
+} // namespace slideshow::internal
+
+namespace {
+
+UpdateLock::UpdateLock (
+    ::slideshow::internal::ScreenUpdater& rUpdater)
+    : mrUpdater(rUpdater),
+      mbIsActivated(false)
+{
+}
+
+
+UpdateLock::~UpdateLock()
+{
+    if (mbIsActivated)
+        mrUpdater.unlockUpdates();
+}
+
+
+void UpdateLock::Activate()
+{
+    if ( ! mbIsActivated)
+    {
+        mbIsActivated = true;
+        mrUpdater.lockUpdates();
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */