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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 <boost/mem_fn.hpp>
#include "pagemanager.hxx"
namespace canvas
{
//////////////////////////////////////////////////////////////////////////////////
// PageManager
//////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////
// PageManager::allocateSpace
//////////////////////////////////////////////////////////////////////////////////
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.
const PageContainer_t::iterator aEnd(maPages.end());
PageContainer_t::iterator it(maPages.begin());
while(it != aEnd)
{
FragmentSharedPtr pFragment((*it)->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;
}
++it;
}
// otherwise try to create a new page and allocate space there...
PageSharedPtr pPage(new 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(new PageFragment(rSize));
maFragments.push_back(pFragment);
return pFragment;
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::free
//////////////////////////////////////////////////////////////////////////////////
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);
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::nakedFragment
//////////////////////////////////////////////////////////////////////////////////
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.
const FragmentContainer_t::const_iterator aEnd(maFragments.end());
FragmentContainer_t::const_iterator candidate(maFragments.begin());
while(candidate != aEnd)
{
if(*candidate && !((*candidate)->isNaked()))
break;
++candidate;
}
if (candidate != aEnd)
{
const ::basegfx::B2ISize& rSize((*candidate)->getSize());
sal_uInt32 nMaxArea(rSize.getX()*rSize.getY());
FragmentContainer_t::const_iterator it(candidate);
while(it != aEnd)
{
if (*it && !((*it)->isNaked()))
{
const ::basegfx::B2ISize& rCandidateSize((*it)->getSize());
const sal_uInt32 nArea(rCandidateSize.getX()*rCandidateSize.getY());
if(nArea > nMaxArea)
{
candidate=it;
nMaxArea=nArea;
}
}
++it;
}
// this does not erase the candidate,
// but makes it 'naked'...
(*candidate)->free(*candidate);
}
else
break;
}
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::relocate
//////////////////////////////////////////////////////////////////////////////////
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.
const PageContainer_t::iterator aEnd(maPages.end());
PageContainer_t::iterator it(maPages.begin());
while(it != aEnd)
{
// if the page at hand takes the fragment, we immediatelly
// call select() to pull the information from the associated
// image to the hardware surface.
if((*it)->nakedFragment(pFragment))
{
// dirty, since newly allocated.
pFragment->select(true);
return true;
}
++it;
}
return false;
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::validatePages
//////////////////////////////////////////////////////////////////////////////////
void PageManager::validatePages()
{
::std::for_each( maPages.begin(),
maPages.end(),
::boost::mem_fn(&Page::validate));
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::getPageSize
//////////////////////////////////////////////////////////////////////////////////
::basegfx::B2ISize PageManager::getPageSize() const
{
return mpRenderModule->getPageSize();
}
//////////////////////////////////////////////////////////////////////////////////
// PageManager::getRenderModule
//////////////////////////////////////////////////////////////////////////////////
canvas::IRenderModuleSharedPtr PageManager::getRenderModule() const
{
return mpRenderModule;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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