/*****************************************************************************
 *
 * 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/agg_rasterizer.hpp>
#include <mapnik/image_cache.hpp>

// agg
#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"
// for polygon_pattern_symbolizer
#include "agg_renderer_scanline.h"
#include "agg_span_allocator.h"
#include "agg_span_pattern_rgba.h"
#include "agg_image_accessors.h"



namespace mapnik {

template <typename T>
void agg_renderer<T>::process(polygon_pattern_symbolizer const& sym,
                              Feature const& feature,
                              proj_transform const& prj_trans)
{
    typedef coord_transform2<CoordTransform,geometry2d> path_type;
    typedef agg::renderer_base<agg::pixfmt_rgba32_plain> ren_base;
    typedef agg::wrap_mode_repeat wrap_x_type;
    typedef agg::wrap_mode_repeat wrap_y_type;
    typedef agg::pixfmt_alpha_blend_rgba<agg::blender_rgba32,
        agg::row_accessor<agg::int8u>, agg::pixel32_type> rendering_buffer;
    typedef agg::image_accessor_wrap<rendering_buffer,
        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;


    agg::rendering_buffer buf(pixmap_.raw_data(),width_,height_, width_ * 4);
    agg::pixfmt_rgba32_plain pixf(buf);
    ren_base renb(pixf);
    
    agg::scanline_u8 sl;
    ras_ptr->reset();
    ras_ptr->gamma(agg::gamma_linear());

    std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
    boost::optional<image_ptr> pat = image_cache::instance()->find(filename,true);

    if (!pat) return;
    
    unsigned w=(*pat)->width();
    unsigned h=(*pat)->height();
    agg::row_accessor<agg::int8u> pattern_rbuf((agg::int8u*)(*pat)->getBytes(),w,h,w*4);
    agg::span_allocator<agg::rgba8> sa;
    agg::pixfmt_alpha_blend_rgba<agg::blender_rgba32,
        agg::row_accessor<agg::int8u>, agg::pixel32_type> pixf_pattern(pattern_rbuf);
    img_source_type img_src(pixf_pattern);
    
    double x0=0,y0=0;
    unsigned num_geometries = feature.num_geometries();
    if (num_geometries>0)
    {
        path_type path(t_,feature.get_geometry(0),prj_trans);
        path.vertex(&x0,&y0);
    }
    unsigned offset_x = unsigned(width_-x0);
    unsigned offset_y = unsigned(height_-y0);
    span_gen_type sg(img_src, offset_x, offset_y);
    renderer_type rp(renb,sa, sg);
    for (unsigned i=0;i<num_geometries;++i)
    {
        geometry2d const& geom = feature.get_geometry(i);
        if (geom.num_points() > 2)
        {
            path_type path(t_,geom,prj_trans);
            ras_ptr->add_path(path);
        }
    }
    agg::render_scanlines(*ras_ptr, sl, rp);
}


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

}