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grid_renderer.cpp
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grid_renderer.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/grid/grid_rasterizer.hpp>
#include <mapnik/grid/grid_renderer.hpp>
#include <mapnik/grid/grid_pixfmt.hpp>
#include <mapnik/grid/grid_pixel.hpp>
#include <mapnik/grid/grid.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/feature_type_style.hpp>
#include <mapnik/marker.hpp>
#include <mapnik/marker_cache.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/font_set.hpp>
#include <mapnik/parse_path.hpp>
#include <mapnik/map.hpp>
#include <mapnik/svg/svg_converter.hpp>
#include <mapnik/svg/svg_renderer.hpp>
#include <mapnik/svg/svg_path_adapter.hpp>
// boost
#include <boost/utility.hpp>
#include <boost/math/special_functions/round.hpp>
// agg
#include "agg_trans_affine.h"
namespace mapnik
{
template <typename T>
grid_renderer<T>::grid_renderer(Map const& m, T & pixmap, double scale_factor, unsigned offset_x, unsigned offset_y)
: feature_style_processor<grid_renderer>(m, scale_factor),
pixmap_(pixmap),
width_(pixmap_.width()),
height_(pixmap_.height()),
scale_factor_(scale_factor),
// NOTE: can change this to m dims instead of pixmap_ if render-time
// resolution support is dropped from grid_renderer python interface
t_(pixmap_.width(),pixmap_.height(),m.get_current_extent(),offset_x,offset_y),
font_engine_(),
font_manager_(font_engine_),
detector_(boost::make_shared<label_collision_detector4>(box2d<double>(-m.buffer_size(), -m.buffer_size(), m.width() + m.buffer_size() ,m.height() + m.buffer_size()))),
ras_ptr(new grid_rasterizer)
{
setup(m);
}
template <typename T>
void grid_renderer<T>::setup(Map const& m)
{
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: Scale=" << m.scale();
// nothing to do for grids yet on setup
}
template <typename T>
grid_renderer<T>::~grid_renderer() {}
template <typename T>
void grid_renderer<T>::start_map_processing(Map const& m)
{
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: Start map processing bbox=" << m.get_current_extent();
ras_ptr->clip_box(0,0,width_,height_);
}
template <typename T>
void grid_renderer<T>::end_map_processing(Map const& m)
{
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: End map processing";
}
template <typename T>
void grid_renderer<T>::start_layer_processing(layer const& lay, box2d<double> const& query_extent)
{
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: Start processing layer=" << lay.name();
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: datasource=" << lay.datasource().get();
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: query_extent = " << query_extent;
if (lay.clear_label_cache())
{
detector_->clear();
}
query_extent_ = query_extent;
int buffer_size = lay.buffer_size();
if (buffer_size != 0 )
{
double padding = buffer_size * (double)(query_extent.width()/pixmap_.width());
double x0 = query_extent_.minx();
double y0 = query_extent_.miny();
double x1 = query_extent_.maxx();
double y1 = query_extent_.maxy();
query_extent_.init(x0 - padding, y0 - padding, x1 + padding , y1 + padding);
}
boost::optional<box2d<double> > const& maximum_extent = lay.maximum_extent();
if (maximum_extent)
{
query_extent_.clip(*maximum_extent);
}
}
template <typename T>
void grid_renderer<T>::end_layer_processing(layer const&)
{
MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: End layer processing";
}
template <typename T>
void grid_renderer<T>::render_marker(mapnik::feature_impl & feature, unsigned int step, pixel_position const& pos, marker const& marker, agg::trans_affine const& tr, double opacity, composite_mode_e comp_op)
{
if (marker.is_vector())
{
typedef coord_transform<CoordTransform,geometry_type> path_type;
typedef agg::renderer_base<mapnik::pixfmt_gray32> ren_base;
typedef agg::renderer_scanline_bin_solid<ren_base> renderer;
agg::scanline_bin sl;
grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
mapnik::pixfmt_gray32 pixf(buf);
ren_base renb(pixf);
renderer ren(renb);
ras_ptr->reset();
box2d<double> const& bbox = (*marker.get_vector_data())->bounding_box();
coord<double,2> c = bbox.center();
// center the svg marker on '0,0'
agg::trans_affine mtx = agg::trans_affine_translation(-c.x,-c.y);
// apply symbol transformation to get to map space
mtx *= tr;
mtx *= agg::trans_affine_scaling(scale_factor_*(1.0/step));
// render the marker at the center of the marker box
mtx.translate(pos.x, pos.y);
using namespace mapnik::svg;
vertex_stl_adapter<svg_path_storage> stl_storage((*marker.get_vector_data())->source());
svg_path_adapter svg_path(stl_storage);
svg_renderer<svg_path_adapter,
agg::pod_bvector<path_attributes>,
renderer,
mapnik::pixfmt_gray32> svg_renderer(svg_path,
(*marker.get_vector_data())->attributes());
svg_renderer.render_id(*ras_ptr, sl, renb, feature.id(), mtx, opacity, bbox);
}
else
{
image_data_32 const& data = **marker.get_bitmap_data();
double width = data.width();
double height = data.height();
double cx = 0.5 * width;
double cy = 0.5 * height;
if (step == 1 && (std::fabs(1.0 - scale_factor_) < 0.001 && tr.is_identity()))
{
// TODO - support opacity
pixmap_.set_rectangle(feature.id(), data,
boost::math::iround(pos.x - cx),
boost::math::iround(pos.y - cy));
}
else
{
// TODO - remove support for step != or add support for agg scaling with opacity
double ratio = (1.0/step);
image_data_32 target(ratio * data.width(), ratio * data.height());
mapnik::scale_image_agg<image_data_32>(target,data, SCALING_NEAR,
scale_factor_, 0.0, 0.0, 1.0, ratio);
pixmap_.set_rectangle(feature.id(), target,
boost::math::iround(pos.x - cx),
boost::math::iround(pos.y - cy));
}
}
pixmap_.add_feature(feature);
}
template class grid_renderer<grid>;
}