/
agg_renderer.hpp
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/
agg_renderer.hpp
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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
*
*****************************************************************************/
#ifndef MAPNIK_AGG_RENDERER_HPP
#define MAPNIK_AGG_RENDERER_HPP
// mapnik
#include <mapnik/config.hpp> // for MAPNIK_DECL
#include <mapnik/feature_style_processor.hpp>
#include <mapnik/util/noncopyable.hpp> // for noncopyable
#include <mapnik/rule.hpp> // for rule, symbolizers
#include <mapnik/geometry/box2d.hpp> // for box2d
#include <mapnik/view_transform.hpp> // for view_transform
#include <mapnik/image_compositing.hpp> // for composite_mode_e
#include <mapnik/pixel_position.hpp>
#include <mapnik/request.hpp>
#include <mapnik/symbolizer_enumerations.hpp>
#include <mapnik/renderer_common.hpp>
#include <mapnik/image_util.hpp>
// stl
#include <memory>
#include <stack>
// fwd declaration to avoid dependence on agg headers
namespace agg {
struct trans_affine;
}
// fwd declarations to speed up compile
namespace mapnik {
class Map;
class feature_impl;
class feature_type_style;
class label_collision_detector4;
class layer;
class color;
struct marker;
class proj_transform;
struct rasterizer;
struct rgba8_t;
template<typename T>
class image;
} // namespace mapnik
namespace mapnik {
template<typename T>
class buffer_stack
{
public:
buffer_stack(std::size_t width, std::size_t height)
: width_(width)
, height_(height)
, buffers_()
, position_(buffers_.begin())
{}
T& push()
{
if (position_ == buffers_.begin())
{
buffers_.emplace_front(width_, height_);
position_ = buffers_.begin();
}
else
{
--position_;
mapnik::fill(*position_, 0); // fill with transparent colour
}
return *position_;
}
bool in_range() const { return (position_ != buffers_.end()); }
void pop()
{
// ^ ensure iterator is not out-of-range
// prior calling this method
++position_;
}
T& top() const { return *position_; }
private:
const std::size_t width_;
const std::size_t height_;
std::deque<T> buffers_;
typename std::deque<T>::iterator position_;
};
template<typename T0, typename T1 = label_collision_detector4>
class MAPNIK_DECL agg_renderer : public feature_style_processor<agg_renderer<T0>>,
private util::noncopyable
{
public:
using buffer_type = T0;
using processor_impl_type = agg_renderer<T0>;
using detector_type = T1;
// create with default, empty placement detector
agg_renderer(Map const& m,
buffer_type& pixmap,
double scale_factor = 1.0,
unsigned offset_x = 0,
unsigned offset_y = 0);
// create with external placement detector, possibly non-empty
agg_renderer(Map const& m,
buffer_type& pixmap,
std::shared_ptr<detector_type> detector,
double scale_factor = 1.0,
unsigned offset_x = 0,
unsigned offset_y = 0);
// pass in mapnik::request object to provide the mutable things per render
agg_renderer(Map const& m,
request const& req,
attributes const& vars,
buffer_type& pixmap,
double scale_factor = 1.0,
unsigned offset_x = 0,
unsigned offset_y = 0);
~agg_renderer();
void start_map_processing(Map const& map);
void end_map_processing(Map const& map);
void start_layer_processing(layer const& lay, box2d<double> const& query_extent);
void end_layer_processing(layer const& lay);
void start_style_processing(feature_type_style const& st);
void end_style_processing(feature_type_style const& st);
void render_marker(pixel_position const& pos,
marker const& marker,
agg::trans_affine const& tr,
double opacity,
composite_mode_e comp_op);
void process(point_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(line_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(line_pattern_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(polygon_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(polygon_pattern_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(raster_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(shield_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(text_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(building_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(markers_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(group_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
void process(debug_symbolizer const& sym, feature_impl& feature, proj_transform const& prj_trans);
void process(dot_symbolizer const& sym, mapnik::feature_impl& feature, proj_transform const& prj_trans);
inline bool process(rule::symbolizers const&, mapnik::feature_impl&, proj_transform const&)
{
// agg renderer doesn't support processing of multiple symbolizers.
return false;
}
void painted(bool painted);
bool painted();
inline eAttributeCollectionPolicy attribute_collection_policy() const { return DEFAULT; }
inline double scale_factor() const { return common_.scale_factor_; }
inline attributes const& variables() const { return common_.vars_; }
protected:
template<typename R>
void debug_draw_box(R& buf, box2d<double> const& extent, double x, double y, double angle = 0.0);
void debug_draw_box(box2d<double> const& extent, double x, double y, double angle = 0.0);
void draw_geo_extent(box2d<double> const& extent, mapnik::color const& color);
private:
std::stack<std::reference_wrapper<buffer_type>> buffers_;
buffer_stack<buffer_type> internal_buffers_;
std::unique_ptr<buffer_type> inflated_buffer_;
const std::unique_ptr<rasterizer> ras_ptr;
gamma_method_enum gamma_method_;
double gamma_;
renderer_common common_;
void setup(Map const& m, buffer_type& pixmap);
};
extern template class MAPNIK_DECL agg_renderer<image<rgba8_t>>;
} // namespace mapnik
#endif // MAPNIK_AGG_RENDERER_HPP