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marker_cache.cpp
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marker_cache.cpp
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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/marker.hpp>
#include <mapnik/marker_cache.hpp>
#include <mapnik/svg/svg_parser.hpp>
#include <mapnik/svg/svg_storage.hpp>
#include <mapnik/svg/svg_converter.hpp>
#include <mapnik/svg/svg_path_adapter.hpp>
#include <mapnik/svg/svg_path_attributes.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_reader.hpp>
// boost
#include <boost/assert.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/make_shared.hpp>
namespace mapnik
{
boost::unordered_map<std::string, marker_ptr> marker_cache::cache_;
void marker_cache::clear()
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
return cache_.clear();
}
bool marker_cache::insert(std::string const& uri, marker_ptr path)
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
return cache_.insert(std::make_pair(uri,path)).second;
}
boost::optional<marker_ptr> marker_cache::find(std::string const& uri, bool update_cache)
{
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(mutex_);
#endif
typedef boost::unordered_map<std::string, marker_ptr>::const_iterator iterator_type;
boost::optional<marker_ptr> result;
iterator_type itr = cache_.find(uri);
if (itr != cache_.end())
{
result.reset(itr->second);
return result;
}
// we can't find marker in cache, lets try to load it from filesystem
boost::filesystem::path path(uri);
if (exists(path))
{
if (is_svg(uri))
{
using namespace mapnik::svg;
try
{
path_ptr marker_path(boost::make_shared<svg_storage_type>());
vertex_stl_adapter<svg_path_storage> stl_storage(marker_path->source());
svg_path_adapter svg_path(stl_storage);
svg_converter_type svg(svg_path, marker_path->attributes());
svg_parser p(svg);
p.parse(uri);
//svg.arrange_orientations();
double lox,loy,hix,hiy;
svg.bounding_rect(&lox, &loy, &hix, &hiy);
marker_path->set_bounding_box(lox,loy,hix,hiy);
marker_ptr mark(boost::make_shared<marker>(marker_path));
result.reset(mark);
if (update_cache)
{
cache_.insert(std::make_pair(uri,*result));
}
return result;
}
catch (...)
{
MAPNIK_LOG_ERROR(marker_cache) << "Exception caught while loading SVG: " << uri;
}
}
else
{
try
{
std::auto_ptr<mapnik::image_reader> reader(mapnik::get_image_reader(uri));
if (reader.get())
{
unsigned width = reader->width();
unsigned height = reader->height();
BOOST_ASSERT(width > 0 && height > 0);
mapnik::image_ptr image(boost::make_shared<mapnik::image_data_32>(width,height));
reader->read(0,0,*image);
marker_ptr mark(boost::make_shared<marker>(image));
result.reset(mark);
if (update_cache)
{
cache_.insert(std::make_pair(uri,*result));
}
}
}
catch (...)
{
MAPNIK_LOG_ERROR(marker_cache) << "Exception caught while loading image: " << uri;
}
}
}
else
{
MAPNIK_LOG_WARN(marker_cache) << "Marker does not exist: " << uri;
}
return result;
}
}