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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* imagecache.cc
*
* Thu Jun 2 17:12:05 CEST 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "imagecache.h"
#include <cassert>
#include "image.h"
namespace GUI
{
ScopedImageBorrower::ScopedImageBorrower(ImageCache& imageCache,
const std::string& filename)
: imageCache(imageCache)
, filename(filename)
, image(imageCache.borrow(filename))
{
}
ScopedImageBorrower::ScopedImageBorrower(ScopedImageBorrower&& other)
: imageCache(other.imageCache)
, filename(other.filename)
, image(other.image)
{
other.filename.clear();
}
ScopedImageBorrower::~ScopedImageBorrower()
{
if(!filename.empty())
{
imageCache.giveBack(filename);
}
}
Image& ScopedImageBorrower::operator*()
{
return image;
}
Image& ScopedImageBorrower::operator()()
{
return image;
}
ScopedImageBorrower ImageCache::getImage(const std::string& filename)
{
return ScopedImageBorrower(*this, filename);
}
Image& ImageCache::borrow(const std::string& filename)
{
auto cacheIterator = imageCache.find(filename);
if(cacheIterator == imageCache.end())
{
Image image(filename);
auto insertValue =
imageCache.emplace(filename, std::make_pair(0, std::move(image)));
cacheIterator = insertValue.first;
}
auto& cacheEntry = cacheIterator->second;
++cacheEntry.first;
return cacheEntry.second;
}
void ImageCache::giveBack(const std::string& filename)
{
auto cacheIterator = imageCache.find(filename);
assert(cacheIterator != imageCache.end());
auto& cacheEntry = cacheIterator->second;
--cacheEntry.first;
if(cacheEntry.first == 0)
{
imageCache.erase(cacheIterator);
}
}
} // GUI::
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