예제 #1
0
void agg_renderer<T>::process(polygon_pattern_symbolizer const& sym,
                              Feature const& feature,
                              proj_transform const& prj_trans)
{
    typedef coord_transform2<CoordTransform,geometry_type> 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(0.0, sym.get_gamma()));

    std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
    boost::optional<mapnik::marker_ptr> marker;
    if ( !filename.empty() )
    {
        marker = marker_cache::instance()->find(filename, true);
    }
    else
    {
        std::clog << "### Warning: file not found: " << filename << "\n";
    }

    if (!marker || !(*marker)->is_bitmap()) return;
    

    boost::optional<image_ptr> pat = (*marker)->get_bitmap_data();

    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);
    
    unsigned num_geometries = feature.num_geometries();

    pattern_alignment_e align = sym.get_alignment();
    unsigned offset_x=0;
    unsigned offset_y=0;
    
    if (align == LOCAL_ALIGNMENT)
    {
        double x0=0,y0=0;
        if (num_geometries>0)
        {
            path_type path(t_,feature.get_geometry(0),prj_trans);
            path.vertex(&x0,&y0);
        }
        offset_x = unsigned(width_-x0);
        offset_y = unsigned(height_-y0);    
    }
    
    span_gen_type sg(img_src, offset_x, offset_y);
    renderer_type rp(renb,sa, sg);
    metawriter_with_properties writer = sym.get_metawriter();
    for (unsigned i=0;i<num_geometries;++i)
    {
        geometry_type const& geom = feature.get_geometry(i);
        if (geom.num_points() > 2)
        {
            path_type path(t_,geom,prj_trans);
            ras_ptr->add_path(path);
            if (writer.first) writer.first->add_polygon(path, feature, t_, writer.second);
        }
    }
    agg::render_scanlines(*ras_ptr, sl, rp);
}
 static boost::python::tuple
 getstate(const polygon_pattern_symbolizer& p)
 {
     return boost::python::make_tuple(p.get_alignment(),p.get_gamma(),p.get_gamma_method());
 }