osg::Image* createImage( const TileKey& key,
ProgressCallback* progress)
{
osg::Timer_t start = osg::Timer::instance()->tick();
std::vector< std::string > files;
_index->getFiles( key.getExtent(), files );
osg::Timer_t end = osg::Timer::instance()->tick();
OE_DEBUG << "Got " << files.size() << " files in " << osg::Timer::instance()->delta_m( start, end) << " ms" << std::endl;
// The result image
osg::Image* result = 0;
for (unsigned int i = 0; i < files.size(); i++)
{
osg::ref_ptr< TileSource> source;
{
//Try to get the TileSource from the cache
TileSourceCache::Record record;
if (_tileSourceCache.get( files[i], record ))
{
source = record.value().get();
}
else
{
// Couldn't get it from the cache so open it.
GDALOptions opt;
opt.url() = files[i];
//Just force it to render so we don't have to worry about falling back
opt.maxDataLevelOverride() = 23;
//Disable the l2 cache so that we don't run out of RAM so easily.
opt.L2CacheSize() = 0;
start = osg::Timer::instance()->tick();
source = osgEarth::TileSourceFactory::create( opt );
Status compStatus = source->open();
if (compStatus.isOK())
{
_tileSourceCache.insert( files[i], source.get() );
}
else
{
OE_WARN << "Failed to open " << files[i] << std::endl;
}
end = osg::Timer::instance()->tick();
//OE_NOTICE << "init took " << osg::Timer::instance()->delta_m( start, end) << "ms" << std::endl;
}
}
start = osg::Timer::instance()->tick();
osg::ref_ptr< osg::Image > image = source->createImage( key);
end = osg::Timer::instance()->tick();
OE_DEBUG << "createImage " << osg::Timer::instance()->delta_m( start, end) << "ms" << std::endl;
if (image)
{
if (!result)
{
// Initialize the result
result = new osg::Image( *image.get() );
}
else
{
// Composite the new image with the result
ImageUtils::mix( result, image.get(), 1.0);
}
}
else
{
OE_DEBUG << "Failed to create image for " << files[i] << std::endl;
}
}
return result;
}
