mapnik/src/agg/process_point_symbolizer.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2010 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
 *
 *****************************************************************************/
//$Id$

// mapnik
#include <mapnik/agg_renderer.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_cache.hpp>
#include <mapnik/svg/marker_cache.hpp>

#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgba.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_u.h"

// stl
#include <string>

namespace mapnik {

struct rasterizer :  agg::rasterizer_scanline_aa<>, boost::noncopyable {};

template <typename T>
void agg_renderer<T>::process(point_symbolizer const& sym,
                              Feature const& feature,
                              proj_transform const& prj_trans)
{
    typedef coord_transform2<CoordTransform,geometry2d> path_type;
    typedef agg::pixfmt_rgba32 pixfmt;
    typedef agg::renderer_base<pixfmt> renderer_base;
    typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_solid;
    
    double x;
    double y;
    double z=0;
    
    std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
    boost::optional<mapnik::image_ptr> data;
    
    if ( filename.empty() )
    {
        // default OGC 4x4 black square
        data = boost::optional<mapnik::image_ptr>(new image_data_32(4,4));
        (*data)->set(0xff000000);
    }
    else if (is_svg(filename))
    {
	// SVG	
	boost::optional<path_ptr> marker;
	ras_ptr->reset();
	ras_ptr->gamma(agg::gamma_linear());
	agg::scanline_u8 sl;
	agg::rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_ * 4);
	pixfmt pixf(buf);
	renderer_base renb(pixf);
	renderer_solid ren(renb);
	box2d<double> extent;
	
	marker = mapnik::marker_cache::instance()->find(filename, true);
	if (marker && *marker)
	{
	    double x1, y1, x2, y2;
	    (*marker)->bounding_rect(&x1, &y1, &x2, &y2);
	    
	    for (unsigned i=0; i<feature.num_geometries(); ++i)
	    {
		geometry2d const& geom = feature.get_geometry(i);  
		geom.label_position(&x,&y);
		prj_trans.backward(x,y,z);
		t_.forward(&x,&y);
		
		
		extent.init(x - 0.5*(x2-x1), y - 0.5*(y2-y1), 
			    x + 0.5*(x2-x1), y + 0.5*(y2-y1));
		
		if (sym.get_allow_overlap() ||
		    detector_.has_placement(extent))
		{
		    agg::trans_affine matrix = agg::trans_affine_translation(x, y);
		    (*marker)->render(*ras_ptr, sl, ren, matrix, renb.clip_box(), sym.get_opacity());
		    detector_.insert(extent);
		}
	    }	
	}
    }
    else
    {
	data = mapnik::image_cache::instance()->find(filename,true);
	if ( data )
	{
	    for (unsigned i=0;i<feature.num_geometries();++i)
	    {
		geometry2d const& geom = feature.get_geometry(i);
		
		geom.label_position(&x,&y);
		prj_trans.backward(x,y,z);
		t_.forward(&x,&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));
		box2d<double> label_ext (floor(x - 0.5 * w),
					 floor(y - 0.5 * h),
					 ceil (x + 0.5 * w),
					 ceil (y + 0.5 * h));
		if (sym.get_allow_overlap() ||
		    detector_.has_placement(label_ext))
		{
		    pixmap_.set_rectangle_alpha2(*(*data),px,py,sym.get_opacity());
		    detector_.insert(label_ext);
		}
	    }
	}
    }
}

template void agg_renderer<image_32>::process(point_symbolizer const&,
					      Feature const&,
					      proj_transform const&);

}