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/*=====================================================================
QGroundControl Open Source Ground Control Station
(c) 2009, 2010 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
This file is part of the QGROUNDCONTROL project
QGROUNDCONTROL is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
QGROUNDCONTROL 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
======================================================================*/
/**
* @file
* @brief Definition of the class TextureCache.
*
* @author Lionel Heng <hengli@student.ethz.ch>
*
*/
#include "TextureCache.h"
TextureCache::TextureCache(uint32_t _cacheSize)
: cacheSize(_cacheSize)
, imageCache(new WebImageCache(0, cacheSize))
{
for (uint32_t i = 0; i < cacheSize; ++i)
{
TexturePtr t(new Texture);
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textures.push_back(t);
}
}
TexturePtr
TextureCache::get(const QString& tileURL, bool useHeightModel)
{
QPair<TexturePtr, int32_t> p1 = lookup(tileURL, useHeightModel);
if (!p1.first.isNull())
{
return p1.first;
}
QPair<WebImagePtr, int32_t> p2 =
imageCache->lookup(tileURL, useHeightModel);
if (!p2.first.isNull())
{
textures[p2.second]->sync(p2.first);
p1 = lookup(tileURL, useHeightModel);
return p1.first;
}
return TexturePtr();
}
void
TextureCache::sync(void)
{
if (requireSync())
{
for (int32_t i = 0; i < textures.size(); ++i)
{
textures[i]->sync(imageCache->at(i));
}
}
}
QPair<TexturePtr, int32_t>
TextureCache::lookup(const QString& tileURL, bool useHeightModel)
{
for (int32_t i = 0; i < textures.size(); ++i)
{
if (textures[i]->getSourceURL() == tileURL &&
textures[i]->is3D() == useHeightModel)
{
return qMakePair(textures[i], i);
}
}
return qMakePair(TexturePtr(), -1);
}
bool
TextureCache::requireSync(void) const
{
for (uint32_t i = 0; i < cacheSize; ++i)
{
if (imageCache->at(i)->getSyncFlag())
{
return true;
}
}
return false;
}