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process_line_pattern_symbolizer.cpp
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process_line_pattern_symbolizer.cpp
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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2010 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
*
*****************************************************************************/
//$Id$
// mapnik
#include <mapnik/agg_renderer.hpp>
#include <mapnik/agg_rasterizer.hpp>
#include <mapnik/agg_pattern_source.hpp>
#include <mapnik/expression_evaluator.hpp>
#include <mapnik/marker_cache.hpp>
// agg
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgba.h"
#include "agg_rasterizer_outline.h"
#include "agg_rasterizer_outline_aa.h"
#include "agg_scanline_u.h"
//
#include "agg_renderer_scanline.h"
#include "agg_pattern_filters_rgba.h"
#include "agg_span_allocator.h"
#include "agg_span_pattern_rgba.h"
#include "agg_renderer_outline_image.h"
namespace mapnik {
template <typename T>
void agg_renderer<T>::process(line_pattern_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry_type> path_type;
typedef agg::line_image_pattern<agg::pattern_filter_bilinear_rgba8> pattern_type;
typedef agg::renderer_base<agg::pixfmt_rgba32_plain> renderer_base;
typedef agg::renderer_outline_image<renderer_base, pattern_type> renderer_type;
typedef agg::rasterizer_outline_aa<renderer_type> rasterizer_type;
agg::rendering_buffer buf(pixmap_.raw_data(),width_,height_, width_ * 4);
agg::pixfmt_rgba32_plain pixf(buf);
std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
boost::optional<marker_ptr> mark = marker_cache::instance()->find(filename,true);
if (!mark || !(*mark)->is_bitmap()) return;
boost::optional<image_ptr> pat = (*mark)->get_bitmap_data();
if (!pat) return;
renderer_base ren_base(pixf);
agg::pattern_filter_bilinear_rgba8 filter;
pattern_source source(*(*pat));
pattern_type pattern (filter,source);
renderer_type ren(ren_base, pattern);
// TODO - should be sensitive to buffer size
ren.clip_box(0,0,width_,height_);
rasterizer_type ras(ren);
metawriter_with_properties writer = sym.get_metawriter();
for (unsigned i=0;i<feature.num_geometries();++i)
{
geometry_type const& geom = feature.get_geometry(i);
if (geom.num_points() > 1)
{
path_type path(t_,geom,prj_trans);
ras.add_path(path);
if (writer.first) writer.first->add_line(path, feature, t_, writer.second);
}
}
}
template void agg_renderer<image_32>::process(line_pattern_symbolizer const&,
Feature const&,
proj_transform const&);
}