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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: */
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