text: /*****************************************************************************
   *
   * This file is part of Mapnik (c++ mapping toolkit)
   *
   * Copyright (C) 2015 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/make_unique.hpp>
  #include <mapnik/image_any.hpp>
  #include <mapnik/feature.hpp>
  #include <mapnik/agg_renderer.hpp>
  #include <mapnik/agg_rasterizer.hpp>
  #include <mapnik/agg_helpers.hpp>
  #include <mapnik/segment.hpp>
  #include <mapnik/symbolizer.hpp>
  #include <mapnik/expression_evaluator.hpp>
  #include <mapnik/expression.hpp>
  #include <mapnik/renderer_common/process_building_symbolizer.hpp>
  #include <mapnik/transform_path_adapter.hpp>
  
  // stl
  #include <deque>
  
  #pragma GCC diagnostic push
  #include <mapnik/warning_ignore_agg.hpp>
  #include "agg_basics.h"
  #include "agg_rendering_buffer.h"
  #include "agg_color_rgba.h"
  #include "agg_pixfmt_rgba.h"
  #include "agg_rasterizer_scanline_aa.h"
  #include "agg_scanline_u.h"
  #include "agg_renderer_scanline.h"
  #include "agg_conv_stroke.h"
  #pragma GCC diagnostic pop
  
  namespace mapnik
  {
  
  template <typename T0,typename T1>
  void agg_renderer<T0,T1>::process(building_symbolizer const& sym,
                                    mapnik::feature_impl & feature,
                                    proj_transform const& prj_trans)
  {
      using transform_path_type = transform_path_adapter<view_transform, vertex_adapter>;
      using ren_base = agg::renderer_base<agg::pixfmt_rgba32_pre>;
      using renderer = agg::renderer_scanline_aa_solid<ren_base>;
  
      agg::rendering_buffer buf(current_buffer_->bytes(),current_buffer_->width(),current_buffer_->height(), current_buffer_->row_size());
      agg::pixfmt_rgba32_pre pixf(buf);
      ren_base renb(pixf);
  
      value_double opacity = get<value_double,keys::fill_opacity>(sym,feature, common_.vars_);
      color const& fill = get<color, keys::fill>(sym, feature, common_.vars_);
      unsigned r=fill.red();
      unsigned g=fill.green();
      unsigned b=fill.blue();
      unsigned a=fill.alpha();
      renderer ren(renb);
      agg::scanline_u8 sl;
  
      ras_ptr->reset();
      double gamma = get<value_double, keys::gamma>(sym, feature, common_.vars_);
      gamma_method_enum gamma_method = get<gamma_method_enum, keys::gamma_method>(sym, feature, common_.vars_);
      if (gamma != gamma_ || gamma_method != gamma_method_)
      {
          set_gamma_method(ras_ptr, gamma, gamma_method);
          gamma_method_ = gamma_method;
          gamma_ = gamma;
      }
  
      double height = get<double, keys::height>(sym, feature, common_.vars_) * common_.scale_factor_;
  
      render_building_symbolizer(
          feature, height,
          [&,r,g,b,a,opacity](path_type const& faces)
          {
              vertex_adapter va(faces);
              transform_path_type faces_path (this->common_.t_,va,prj_trans);
              ras_ptr->add_path(faces_path);
              ren.color(agg::rgba8_pre(int(r*0.8), int(g*0.8), int(b*0.8), int(a * opacity)));
              agg::render_scanlines(*ras_ptr, sl, ren);
              this->ras_ptr->reset();
          },
          [&,r,g,b,a,opacity](path_type const& frame)
          {
              vertex_adapter va(frame);
              transform_path_type path(common_.t_,va, prj_trans);
              agg::conv_stroke<transform_path_type> stroke(path);
              stroke.width(common_.scale_factor_);
              ras_ptr->add_path(stroke);
              ren.color(agg::rgba8_pre(int(r*0.8), int(g*0.8), int(b*0.8), int(a * opacity)));
              agg::render_scanlines(*ras_ptr, sl, ren);
              ras_ptr->reset();
          },
          [&,r,g,b,a,opacity](path_type const& roof)
          {
              vertex_adapter va(roof);
              transform_path_type roof_path (common_.t_,va,prj_trans);
              ras_ptr->add_path(roof_path);
              ren.color(agg::rgba8_pre(r, g, b, int(a * opacity)));
              agg::render_scanlines(*ras_ptr, sl, ren);
          });
  }
  
  template void agg_renderer<image_rgba8>::process(building_symbolizer const&,
                                                mapnik::feature_impl &,
                                                proj_transform const&);
  }
  