mapnik/src/agg_renderer.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 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
 *
 *****************************************************************************/
//$Id$

#include "agg_renderer.hpp"

#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_p.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgba.h"
#include "agg_path_storage.h"
#include "agg_span_allocator.h"
#include "agg_span_pattern_rgba.h"
#include "agg_image_accessors.h"
#include "agg_conv_stroke.h"
#include "agg_conv_dash.h"
#include "agg_conv_contour.h"
#include "agg_vcgen_stroke.h"
#include "agg_conv_adaptor_vcgen.h"
#include "agg_conv_smooth_poly1.h"
#include "agg_conv_marker.h"
#include "agg_arrowhead.h"
#include "agg_vcgen_markers_term.h"
#include "agg_renderer_outline_aa.h"
#include "agg_rasterizer_outline_aa.h"
#include "agg_rasterizer_outline.h"
#include "agg_renderer_outline_image.h"
#include "agg_span_allocator.h"
#include "agg_span_pattern_rgba.h"
#include "agg_renderer_scanline.h"
#include "agg_pattern_filters_rgba.h"
#include "agg_renderer_outline_image.h"

#include <boost/utility.hpp>
#include <iostream>

namespace mapnik
{
    class pattern_source : private boost::noncopyable
    {
    public:
        pattern_source(ImageData32 const& pattern)
            : pattern_(pattern) {}
	
        unsigned int width() const
        {
            return pattern_.width();
        }
        unsigned int height() const
        {
            return pattern_.height();
        }
        agg::rgba8 pixel(int x, int y) const
        {
            unsigned c = pattern_(x,y);
            return agg::rgba8(c & 0xff, (c >> 8) & 0xff, (c >> 16) & 0xff,(c >> 24) & 0xff);
        }
    private:
        ImageData32 const& pattern_;
    };

    template <typename T>
    agg_renderer<T>::agg_renderer(Map const& m, T & pixmap)
        : feature_style_processor<agg_renderer>(m),
          pixmap_(pixmap),
          t_(m.getWidth(),m.getHeight(),m.getCurrentExtent()),
          detector_(Envelope<double>(-64 ,-64, m.getWidth() + 64 ,m.getHeight() + 64))
    {
        Color const& bg=m.getBackground();
        pixmap_.setBackground(bg);
        std::clog << "scale="<<m.scale()<<std::endl;
    }
    
    template <typename T>
    void agg_renderer<T>::start_map_processing(Map const& map)
    {
        std::clog << "start map processing bbox=" << map.getCurrentExtent() <<  std::endl;
    }

    template <typename T>
    void agg_renderer<T>::end_map_processing(Map const& )
    {
        std::clog << "end map processing" << std::endl;
    }
    
    template <typename T>
    void agg_renderer<T>::start_layer_processing(Layer const& lay)
    {
        std::clog << "start layer processing : " << lay.name()  << std::endl;
        std::clog << "datasource = " << lay.datasource().get() << std::endl;
    }
    
    template <typename T>
    void agg_renderer<T>::end_layer_processing(Layer const&)
    {
        std::clog << "end layer processing" << std::endl;
    }
    
    template <typename T>	
    void agg_renderer<T>::process(polygon_symbolizer const& sym,Feature const& feature)
    {
        typedef  coord_transform<CoordTransform,geometry_type> path_type;
        typedef agg::renderer_base<agg::pixfmt_rgba32> ren_base;    
        typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
	    
        Color const& fill_  = sym.get_fill();
	    
        geometry_ptr const& geom=feature.get_geometry();
        if (geom && geom->num_points() > 2) 
        {
            unsigned width = pixmap_.width();
            unsigned height = pixmap_.height();
            path_type path(t_,*geom);
            agg::row_ptr_cache<agg::int8u> buf(pixmap_.raw_data(),width,height,width * 4);
            agg::pixfmt_rgba32 pixf(buf);
            ren_base renb(pixf);	    
		
            unsigned r=fill_.red();
            unsigned g=fill_.green();
            unsigned b=fill_.blue();
            //unsigned a=fill_.alpha();
            renderer ren(renb);
		
            agg::rasterizer_scanline_aa<> ras;
            agg::scanline_u8 sl;
            ras.clip_box(0,0,width,height);
            ras.add_path(path);
            ren.color(agg::rgba8(r, g, b, int(255 * sym.get_opacity())));
            agg::render_scanlines(ras, sl, ren);
        }
    }

    template <typename T>
    void agg_renderer<T>::process(line_symbolizer const& sym,Feature const& feature)
    {   
        typedef agg::renderer_base<agg::pixfmt_rgba32> ren_base; 
        typedef coord_transform<CoordTransform,geometry_type> path_type;
        typedef agg::renderer_outline_aa<ren_base> renderer_oaa;
        typedef agg::rasterizer_outline_aa<renderer_oaa> rasterizer_outline_aa;
        typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
	    
        geometry_ptr const& geom=feature.get_geometry();
        if (geom && geom->num_points() > 1)
        {
            path_type path(t_,*geom);
            agg::row_ptr_cache<agg::int8u> buf(pixmap_.raw_data(),pixmap_.width(),pixmap_.height(),
                                               pixmap_.width()*4);
            agg::pixfmt_rgba32 pixf(buf);
            ren_base renb(pixf);	    
		
            mapnik::stroke const&  stroke_ = sym.get_stroke();
		
            Color const& col = stroke_.get_color();
            unsigned r=col.red();
            unsigned g=col.green();
            unsigned b=col.blue();	    
		
            if (stroke_.has_dash())
            {
                renderer ren(renb);	
                agg::rasterizer_scanline_aa<> ras;
                agg::scanline_u8 sl;
                agg::conv_dash<path_type> dash(path);
                dash_array const& d = stroke_.get_dash_array();
                dash_array::const_iterator itr = d.begin();
                dash_array::const_iterator end = d.end();
                while (itr != end)
                {
                    dash.add_dash(itr->first, itr->second);
                    ++itr;
                }
                agg::conv_stroke<agg::conv_dash<path_type > > stroke(dash);
		    
                line_join_e join=stroke_.get_line_join();
                if ( join == MITER_JOIN)
                    stroke.generator().line_join(agg::miter_join);
                else if( join == MITER_REVERT_JOIN) 
                    stroke.generator().line_join(agg::miter_join);
                else if( join == ROUND_JOIN) 
                    stroke.generator().line_join(agg::round_join);
                else
                    stroke.generator().line_join(agg::bevel_join);
		    
                line_cap_e cap=stroke_.get_line_cap();
                if (cap == BUTT_CAP)    
                    stroke.generator().line_cap(agg::butt_cap);
                else if (cap == SQUARE_CAP)
                    stroke.generator().line_cap(agg::square_cap);
                else 
                    stroke.generator().line_cap(agg::round_cap);
		    
                stroke.generator().miter_limit(4.0);
                stroke.generator().width(stroke_.get_width());
		    
                ras.clip_box(0,0,pixmap_.width(),pixmap_.height());
                ras.add_path(stroke);
                ren.color(agg::rgba8(r, g, b, int(255*stroke_.get_opacity())));
                agg::render_scanlines(ras, sl, ren);
            }
            else if (stroke_.get_width() <= 1.0)
            {
                agg::line_profile_aa prof;
                prof.width(stroke_.get_width());
                renderer_oaa ren_oaa(renb, prof);
                rasterizer_outline_aa ras_oaa(ren_oaa);
		    
                ren_oaa.color(agg::rgba8(r, g, b, int(255*stroke_.get_opacity())));
                ren_oaa.clip_box(0,0,pixmap_.width(),pixmap_.height());
                ras_oaa.add_path(path);		
		    
            }
            else 
            {
                renderer ren(renb);	
                agg::rasterizer_scanline_aa<> ras;
                agg::scanline_p8 sl;
                agg::conv_stroke<path_type>  stroke(path);
		    
                line_join_e join=stroke_.get_line_join();
                if ( join == MITER_JOIN)
                    stroke.generator().line_join(agg::miter_join);
                else if( join == MITER_REVERT_JOIN) 
                    stroke.generator().line_join(agg::miter_join);
                else if( join == ROUND_JOIN) 
                    stroke.generator().line_join(agg::round_join);
                else
                    stroke.generator().line_join(agg::bevel_join);
		    
                line_cap_e cap=stroke_.get_line_cap();
                if (cap == BUTT_CAP)    
                    stroke.generator().line_cap(agg::butt_cap);
                else if (cap == SQUARE_CAP)
                    stroke.generator().line_cap(agg::square_cap);
                else 
                    stroke.generator().line_cap(agg::round_cap);
		
                stroke.generator().miter_limit(4.0);
                stroke.generator().width(stroke_.get_width());
		    
                ras.clip_box(0,0,pixmap_.width(),pixmap_.height());
                ras.add_path(stroke);
                ren.color(agg::rgba8(r, g, b, int(255*stroke_.get_opacity())));
                agg::render_scanlines(ras, sl, ren);
            }
        }
    }

    template <typename T>
    void agg_renderer<T>::process(point_symbolizer const& sym,Feature const& feature)
    {
        geometry_ptr const& geom=feature.get_geometry();
        if (geom)
        {
            double x;
            double y;
            ImageData32 const& data = sym.get_data();
            geom->label_position(&x,&y);
            t_.forward_x(&x);
            t_.forward_y(&y);
            int w = data.width();
            int h = data.height();
            int px=int(floor(x - 0.5 * w));
            int py=int(floor(y - 0.5 * h));
            
            if (sym.get_allow_overlap() || 
                detector_.has_placement(Envelope<double>(floor(x - 0.5 * w),
                                                         floor(y - 0.5 * h),
                                                         ceil (x + 0.5 * w),
                                                         ceil (y + 0.5 * h))))
            {    
                pixmap_.set_rectangle_alpha(px,py,data);
            }
        }
    }
    
    template <typename T>
    void  agg_renderer<T>::process(line_pattern_symbolizer const& sym,Feature const& feature)
    {
        typedef  coord_transform<CoordTransform,geometry_type> path_type;
        typedef agg::line_image_pattern<agg::pattern_filter_bilinear_rgba8> pattern_type;
        typedef agg::renderer_base<agg::pixfmt_rgba32> renderer_base;
        typedef agg::renderer_outline_image<renderer_base, pattern_type> renderer_type;
        typedef agg::rasterizer_outline_aa<renderer_type> rasterizer_type;

        geometry_ptr const& geom=feature.get_geometry();
        if (geom && geom->num_points() > 1)
        {
            unsigned width = pixmap_.width();
            unsigned height = pixmap_.height();
            ImageData32 const& pat = sym.get_pattern();
            path_type path(t_,*geom);
            agg::row_ptr_cache<agg::int8u> buf(pixmap_.raw_data(), width, height,width*4);
            agg::pixfmt_rgba32 pixf(buf);
            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);
            ren.clip_box(0,0,width,height);
            rasterizer_type ras(ren);	    
            ras.add_path(path);    
        }
    }
    
    template <typename T>
    void agg_renderer<T>::process(polygon_pattern_symbolizer const& sym,Feature const& feature)
    {
        typedef  coord_transform<CoordTransform,geometry_type> path_type;
        typedef agg::renderer_base<agg::pixfmt_rgba32> ren_base; 
        typedef agg::wrap_mode_repeat wrap_x_type;
        typedef agg::wrap_mode_repeat wrap_y_type;
        typedef agg::image_accessor_wrap<agg::pixfmt_rgba32, 
            wrap_x_type,
            wrap_y_type> img_source_type;
	
        typedef agg::span_pattern_rgba<img_source_type> span_gen_type;
	
        typedef agg::renderer_scanline_aa<ren_base, 
            agg::span_allocator<agg::rgba8>,
            span_gen_type> renderer_type;  
        geometry_ptr const& geom=feature.get_geometry();
        if (geom && geom->num_points() > 2)
        {
            ImageData32 const& pattern = sym.get_pattern();
	    
            unsigned width = pixmap_.width();
            unsigned height = pixmap_.height();
            path_type path(t_,*geom);
	    
            agg::row_ptr_cache<agg::int8u> buf(pixmap_.raw_data(),width,height,width * 4);
            agg::pixfmt_rgba32 pixf(buf);
            ren_base renb(pixf);
	
            unsigned w=pattern.width();
            unsigned h=pattern.height();
            agg::row_ptr_cache<agg::int8u> pattern_rbuf((agg::int8u*)pattern.getBytes(),w,h,w*4);  
	    
            double x0,y0;
            path.vertex(&x0,&y0);
            path.rewind(0);
	
            unsigned offset_x = unsigned(width - x0);
            unsigned offset_y = unsigned(height - y0);
	
            agg::span_allocator<agg::rgba8> sa;
            img_source_type img_src(pattern_rbuf);
            span_gen_type sg(img_src, offset_x, offset_y);
            renderer_type rp(renb,sa, sg);
	
            agg::rasterizer_scanline_aa<> ras;
            agg::scanline_u8 sl;
            ras.clip_box(0,0,width,height);
            ras.add_path(path);
            agg::render_scanlines(ras, sl, rp);   
        }
    }

    template <typename T>
    void agg_renderer<T>::process(raster_symbolizer const& ,Feature const& feature)
    {
        // TODO -- at the moment raster_symbolizer is an empty class 
        // used for type dispatching, but we can have some fancy raster
        // processing in a future (filters??). Just copy raster into pixmap for now.
        raster_ptr const& raster=feature.get_raster();
        if (raster)
        {
            pixmap_.set_rectangle(raster->x_,raster->y_,raster->data_);
        }
    }
    
    template <typename T>
    void agg_renderer<T>::process(text_symbolizer const& sym ,Feature const& feature)
    {
        typedef  coord_transform<CoordTransform,geometry_type> path_type;
        geometry_ptr const& geom=feature.get_geometry();
        if (geom)
        {
            double angle = 0.0;	    
            if (sym.get_label_placement() == line_placement && 
                geom->num_points() > 1)
            {
	       
                path_type path(t_,*geom);
                double x0,y0,x1,y1;
                path.vertex(&x0,&y0);
                path.vertex(&x1,&y1);
                double dx = x1 - x0;
                double dy = ( y1 - y0 > 1e-7 ) ?  y1 - y0 : 1.0;
	        
                angle = atan( dx/ dy ) - 0.5 * 3.1459;
		
                //TODO!!!!!!!!!!!!!!!!!!!!
            }   
	    
            std::string text = feature[sym.get_name()].to_string();
            if (text.length() > 0)
            {
                Color const& fill  = sym.get_fill();
	
                double x;
                double y;
                geom->label_position(&x,&y);
                t_.forward_x(&x);
                t_.forward_y(&y);

                face_ptr face = font_manager_.get_face("Bitstream Vera Sans Roman");//TODO
                //face_ptr face = font_manager_.get_face("Times New Roman Regular");//TODO
                if (face)
                {
                    text_renderer<mapnik::Image32> ren(pixmap_,face);
                    ren.set_pixel_size(sym.get_text_size());
                    ren.set_fill(fill);
                    ren.set_halo_fill(sym.get_halo_fill());
                    ren.set_halo_radius(sym.get_halo_radius());
                    ren.set_angle(float(angle));

                    std::pair<unsigned,unsigned> dim = ren.prepare_glyphs(text);
                    Envelope<double> text_box(x - 0.5*dim.first,y - 0.5 * dim.second ,
                                              x + 0.5*dim.first,y + 0.5 * dim.second);
		    
                    if (sym.get_halo_radius() > 0)
                    {
                        text_box.width(text_box.width() + sym.get_halo_radius()*2);
                        text_box.height(text_box.height() + sym.get_halo_radius()*2);
                    }

                    if (detector_.has_placement(text_box))
                    {
                        ren.render(x - 0.5 * dim.first,y + 0.5 * dim.second);
                    }
                }
            }  
        }
    }
    
    template class agg_renderer<Image32>;
}