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mapnik/src/grid/grid_renderer.cpp
Artem Pavlenko d4ae5ac653 SVG group renderer implementation (WIP) [skip ci]
2022-11-18 15:17:58 +00:00

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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2021 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
*
*****************************************************************************/
#if defined(GRID_RENDERER)
// mapnik
#include <mapnik/grid/grid_rasterizer.hpp>
#include <mapnik/grid/grid_renderer.hpp>
#include <mapnik/grid/grid_renderer_base.hpp>
#include <mapnik/grid/grid.hpp>
#include <mapnik/image_scaling.hpp>
#include <mapnik/rule.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/label_collision_detector.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/request.hpp>
#include <mapnik/svg/svg_converter.hpp>
#include <mapnik/svg/svg_renderer_agg.hpp>
#include <mapnik/svg/svg_path_adapter.hpp>
#include <mapnik/pixel_position.hpp>
#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
#include <boost/math/special_functions/round.hpp>
MAPNIK_DISABLE_WARNING_POP
#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore_agg.hpp>
#include "agg_trans_affine.h"
MAPNIK_DISABLE_WARNING_POP
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)
, ras_ptr(new grid_rasterizer)
, common_(m, attributes(), offset_x, offset_y, m.width(), m.height(), scale_factor)
{
setup(m);
}
template<typename T>
grid_renderer<T>::grid_renderer(Map const& m,
request const& req,
attributes const& vars,
T& pixmap,
double scale_factor,
unsigned offset_x,
unsigned offset_y)
: feature_style_processor<grid_renderer>(m, scale_factor)
, pixmap_(pixmap)
, ras_ptr(new grid_rasterizer)
, common_(m, req, vars, offset_x, offset_y, req.width(), req.height(), scale_factor)
{
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, common_.width_, common_.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())
{
common_.detector_->clear();
}
common_.query_extent_ = query_extent;
boost::optional<box2d<double>> const& maximum_extent = lay.maximum_extent();
if (maximum_extent)
{
common_.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 buffer_type>
struct grid_render_marker_visitor
{
grid_render_marker_visitor(buffer_type& pixmap,
std::unique_ptr<grid_rasterizer> const& ras_ptr,
renderer_common const& common,
mapnik::feature_impl const& feature,
pixel_position const& pos,
agg::trans_affine const& tr,
double opacity)
: pixmap_(pixmap)
, ras_ptr_(ras_ptr)
, common_(common)
, feature_(feature)
, pos_(pos)
, tr_(tr)
, opacity_(opacity)
{}
void operator()(marker_null const&) {}
void operator()(marker_svg const& marker)
{
using pixfmt_type = typename grid_renderer_base_type::pixfmt_type;
using renderer_type = agg::renderer_scanline_bin_solid<grid_renderer_base_type>;
agg::scanline_bin sl;
grid_rendering_buffer buf(pixmap_.raw_data(), common_.width_, common_.height_, common_.width_);
pixfmt_type pixf(buf);
grid_renderer_base_type renb(pixf);
renderer_type ren(renb);
ras_ptr_->reset();
box2d<double> const& bbox = marker.get_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(common_.scale_factor_);
// render the marker at the center of the marker box
mtx.translate(pos_.x, pos_.y);
svg::vertex_stl_adapter<svg::svg_path_storage> stl_storage(marker.get_data()->source());
svg_path_adapter svg_path(stl_storage);
svg::renderer_agg<svg_path_adapter, svg_attribute_type, renderer_type, pixfmt_type> svg_renderer(
svg_path,
marker.get_data()->svg_group());
svg_renderer.render_id(*ras_ptr_, sl, renb, feature_.id(), mtx, opacity_, bbox);
}
void operator()(marker_rgba8 const& marker)
{
image_rgba8 const& data = marker.get_data();
double width = data.width();
double height = data.height();
double cx = 0.5 * width;
double cy = 0.5 * height;
if ((std::fabs(1.0 - common_.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
{
image_rgba8 target(data.width(), data.height());
boost::optional<double> nodata;
mapnik::scale_image_agg(target,
data,
SCALING_NEAR,
1,
1,
0.0,
0.0,
1.0,
nodata); // TODO: is 1.0 a valid default here, and do we even care in grid_renderer
// what the image looks like?
pixmap_.set_rectangle(feature_.id(),
target,
boost::math::iround(pos_.x - cx),
boost::math::iround(pos_.y - cy));
}
}
private:
buffer_type& pixmap_;
std::unique_ptr<grid_rasterizer> const& ras_ptr_;
renderer_common const& common_;
mapnik::feature_impl const& feature_;
pixel_position const& pos_;
agg::trans_affine const& tr_;
double opacity_;
};
template<typename T>
void grid_renderer<T>::render_marker(mapnik::feature_impl const& feature,
pixel_position const& pos,
marker const& marker,
agg::trans_affine const& tr,
double opacity,
composite_mode_e /*comp_op*/)
{
grid_render_marker_visitor<buffer_type> visitor(pixmap_, ras_ptr, common_, feature, pos, tr, opacity);
util::apply_visitor(visitor, marker);
pixmap_.add_feature(feature);
}
template class MAPNIK_DECL grid_renderer<grid>;
} // namespace mapnik
#endif
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