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-rw-r--r--canvas/source/tools/pagemanager.cxx152
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include "pagemanager.hxx"
+
+namespace canvas
+{
+ FragmentSharedPtr PageManager::allocateSpace( const ::basegfx::B2ISize& rSize )
+ {
+ // we are asked to find a location for the requested size.
+ // first we try to satisfy the request from the
+ // remaining space in the existing pages.
+ for( const auto& pPage : maPages )
+ {
+ FragmentSharedPtr pFragment( pPage->allocateSpace(rSize) );
+ if(pFragment)
+ {
+ // the page created a new fragment, since we maybe want
+ // to consolidate sparse pages we keep a reference to
+ // the fragment.
+ maFragments.push_back(pFragment);
+ return pFragment;
+ }
+ }
+
+ // otherwise try to create a new page and allocate space there...
+ PageSharedPtr pPage = std::make_shared<Page>(mpRenderModule);
+ if(pPage->isValid())
+ {
+ maPages.push_back(pPage);
+ FragmentSharedPtr pFragment(pPage->allocateSpace(rSize));
+ if (pFragment)
+ maFragments.push_back(pFragment);
+ return pFragment;
+ }
+
+ // the rendermodule failed to create a new page [maybe out
+ // of videomemory], and all other pages could not take
+ // the new request. we decide to create a 'naked' fragment
+ // which will receive its location later.
+ FragmentSharedPtr pFragment = std::make_shared<PageFragment>(rSize);
+ maFragments.push_back(pFragment);
+ return pFragment;
+ }
+
+ void PageManager::free( const FragmentSharedPtr& pFragment )
+ {
+ // erase the reference to the given fragment from our
+ // internal container.
+ FragmentContainer_t::iterator it(
+ std::remove(
+ maFragments.begin(),maFragments.end(),pFragment));
+ maFragments.erase(it,maFragments.end());
+
+ // let the fragment itself know about it...
+ // we need to pass 'this' as argument since the fragment
+ // needs to pass this to the page and can't create
+ // shared_ptr from itself...
+ pFragment->free(pFragment);
+ }
+
+ void PageManager::nakedFragment( const FragmentSharedPtr& pFragment )
+ {
+ if(maPages.empty())
+ return;
+
+ // okay, one last chance is left, we try all available
+ // pages again. maybe some other fragment was deleted
+ // and we can exploit the space.
+ while( !( relocate( pFragment ) ) )
+ {
+ // no way, we need to free up some space...
+ // TODO(F1): this is a heuristic, could
+ // be designed as a policy.
+ auto aEnd( maFragments.cend() );
+ auto aCurrMax( aEnd );
+ sal_uInt32 nCurrMaxArea = 0;
+ for( auto aCurr = maFragments.begin(); aCurr != aEnd; ++aCurr )
+ {
+ if( *aCurr && !( ( *aCurr )->isNaked() ) )
+ {
+ const ::basegfx::B2ISize& rSize( ( *aCurr )->getSize() );
+ sal_uInt32 nArea( rSize.getX() * rSize.getY() );
+
+ if( nCurrMaxArea < nArea )
+ {
+ aCurrMax = aCurr;
+ nCurrMaxArea = nArea;
+ }
+ }
+ }
+ // this does not erase the candidate,
+ // but makes it 'naked'...
+ if( aCurrMax != aEnd )
+ ( *aCurrMax )->free( *aCurrMax );
+ else
+ break;
+ }
+ }
+
+ bool PageManager::relocate( const FragmentSharedPtr& pFragment )
+ {
+ // the fragment passed as argument is assumed to
+ // be naked, that is it is not located on any page.
+ // we try all available pages again, maybe some
+ // other fragment was deleted and we can exploit the space.
+ for( const auto& pPage : maPages )
+ {
+ // if the page at hand takes the fragment, we immediately
+ // call select() to pull the information from the associated
+ // image to the hardware surface.
+ if( pPage->nakedFragment( pFragment ) )
+ {
+ // dirty, since newly allocated.
+ pFragment->select(true);
+ return true;
+ }
+ }
+ return false;
+ }
+
+ void PageManager::validatePages()
+ {
+ for( const auto& rPagePtr : maPages )
+ rPagePtr->validate();
+ }
+
+ ::basegfx::B2ISize PageManager::getPageSize() const
+ {
+ return mpRenderModule->getPageSize();
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */