add grid_renderer backend

CHANGELOG

@@ -14,6 +14,9 @@ For a complete change history, see the SVN log.
 Mapnik Trunk
 ------------
 
+- Added new rendering backend, grid_renderer, that collects the attributes of rendered features and
+  burns their ids into a grid buffer.
+
 - Added optional 'maximum-extent' parameter to map object. If set will be used, instead of combined
   layer extents, for return value of map.zoom_all(). Useful in cases where the combined layer extents
   cannot possibly be projected into the map srs or the user wishes to control map bounds without

include/mapnik/config.hpp

@@ -25,6 +25,8 @@
 
 // Windows DLL support
 
+#define MAPNIK_SUPPORTS_GRID_RENDERER
+
 #ifdef _WINDOWS
 #  define MAPNIK_EXP __declspec (dllexport)
 #  define MAPNIK_IMP __declspec (dllimport)

include/mapnik/feature_style_processor.hpp

@@ -84,7 +84,7 @@ public:
           scale_factor_(scale_factor) {}
 
     /*!
-     * @return apply renderer to all maps layers.
+     * @return apply renderer to all map layers.
      */
     void apply()
     {
@@ -124,6 +124,30 @@ public:
         p.end_map_processing(m_);
     }   
 
+    /*!
+     * @return apply renderer to a single layer, providing pre-populated set of query attribute names.
+     */
+    void apply(mapnik::layer const& lyr, std::set<std::string>& names)
+    {
+        Processor & p = static_cast<Processor&>(*this);
+        p.start_map_processing(m_);
+        try
+        {
+            projection proj(m_.srs());
+            double scale_denom = mapnik::scale_denominator(m_,proj.is_geographic());
+            scale_denom *= scale_factor_;
+
+            if (lyr.isVisible(scale_denom))
+            {
+                apply_to_layer(lyr, p, proj, scale_denom, names);
+            }
+        }
+        catch (proj_init_error& ex)
+        {
+            std::clog << "proj_init_error:" << ex.what() << "\n"; 
+        }
+        p.end_map_processing(m_);
+    }
 private:
     /*!
      * @return initialize metawriters for a given map and projection.
@@ -153,7 +177,7 @@ private:
     }
 
     /*!
-     * @return render a layer given a projection and scale
+     * @return render a layer given a projection and scale.
      */
     void apply_to_layer(layer const& lay, Processor & p, 
                         projection const& proj0,

include/mapnik/font_engine_freetype.hpp

@@ -54,6 +54,7 @@ extern "C"
 #include <vector>
 #include <map>
 #include <iostream>
+#include <algorithm>
 
 // icu
 #include <unicode/ubidi.h>
@@ -490,6 +491,42 @@ struct text_renderer : private boost::noncopyable
         }
     }
 
+    void render_id(int feature_id,double x0, double y0, double min_radius=1.0)
+    {
+        FT_Error  error;
+        FT_Vector start;
+        unsigned height = pixmap_.height();
+
+        start.x =  static_cast<FT_Pos>(x0 * (1 << 6));
+        start.y =  static_cast<FT_Pos>((height - y0) * (1 << 6));
+
+        // now render transformed glyphs
+        typename glyphs_t::iterator pos;
+
+        stroker_.init(std::max(halo_radius_,min_radius));   
+        for ( pos = glyphs_.begin(); pos != glyphs_.end();++pos)
+        {
+            FT_Glyph g;
+            error = FT_Glyph_Copy(pos->image, &g);
+            if (!error)
+            {
+                FT_Glyph_Transform(g,0,&start);
+                FT_Glyph_Stroke(&g,stroker_.get(),1);
+                error = FT_Glyph_To_Bitmap( &g,FT_RENDER_MODE_NORMAL,0,1);
+                //error = FT_Glyph_To_Bitmap( &g,FT_RENDER_MODE_MONO,0,1);
+                if ( ! error )
+                {
+                    
+                    FT_BitmapGlyph bit = (FT_BitmapGlyph)g;
+                    render_bitmap_id(&bit->bitmap, feature_id,
+                                  bit->left,
+                                  height - bit->top);
+                }
+            }
+            FT_Done_Glyph(g);
+        }    
+    }
+    
 private:
 
     // unused currently, stroker is the new method for drawing halos
@@ -535,6 +572,26 @@ private:
         }
     }
 
+    void render_bitmap_id(FT_Bitmap *bitmap,int feature_id,int x,int y)
+    {
+        int x_max=x+bitmap->width;
+        int y_max=y+bitmap->rows;
+        int i,p,j,q;
+
+        for (i=x,p=0;i<x_max;++i,++p)
+        {
+            for (j=y,q=0;j<y_max;++j,++q)
+            {
+                int gray=bitmap->buffer[q*bitmap->width+p];
+                if (gray)
+                {
+                    pixmap_.setPixel(i,j,feature_id);
+                    //pixmap_.blendPixel2(i,j,rgba,gray,opacity_);
+                }
+            }
+        }
+    }
+
     pixmap_type & pixmap_;
     face_set_ptr faces_;
     stroker & stroker_;

include/mapnik/grid/grid.hpp

@@ -0,0 +1,269 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_GRID_HPP
+#define MAPNIK_GRID_HPP
+
+// mapnik
+#include <mapnik/image_data.hpp>
+#include <mapnik/box2d.hpp>
+#include <mapnik/image_view.hpp>
+#include <mapnik/global.hpp>
+#include <mapnik/value.hpp>
+
+// stl
+#include <map>
+#include <cmath>
+#include <string>
+#include <cassert>
+#include <vector>
+
+namespace mapnik
+{
+
+template <typename T>
+class MAPNIK_DECL hit_grid
+{
+public:
+    typedef T value_type;
+    typedef mapnik::ImageData<value_type> data_type;
+    typedef std::string lookup_type;
+    // mapping between pixel id and join_field
+    typedef std::map<value_type, lookup_type> feature_key_type;
+    typedef std::map<lookup_type, value_type> key_type;
+    typedef std::map<std::string, mapnik::value> feature_properties_type;
+    // note: feature_type is not the same as a mapnik::Feature as it lacks a geometry
+    typedef std::map<std::string, feature_properties_type > feature_type;
+    
+private:
+    unsigned width_;
+    unsigned height_;
+    std::string join_field_;
+    key_type keys_;
+    std::vector<std::string> key_order_;
+    feature_key_type f_keys_;
+    feature_type features_;
+    data_type data_;
+    std::set<std::string> names_;
+    unsigned int step_;
+    
+public:
+
+    //value_type feature_count_;
+    std::string id_name_;
+
+    hit_grid(int width, int height, std::string const& join_field, unsigned step)
+        :width_(width),
+         height_(height),
+         join_field_(join_field),
+         data_(width,height),
+         step_(step),
+         //feature_count_(0),
+         id_name_("__id__") {
+             f_keys_[0] = "";
+         }
+    
+    hit_grid(const hit_grid<T>& rhs)
+        :width_(rhs.width_),
+         height_(rhs.height_),
+         join_field_(rhs.join_field_),
+         data_(rhs.data_),
+         //feature_count_(0),
+         step_(rhs.step_),
+         id_name_("__id__")  {
+             f_keys_[0] = "";     
+         }
+    
+    ~hit_grid() {}
+
+    void add_feature(Feature const& feature)
+    {
+
+        // copies feature props
+        std::map<std::string,value> fprops = feature.props();
+        lookup_type lookup_value;
+        if (join_field_ == id_name_)
+        {
+            // TODO - this will break if lookup_type is not a string
+            std::stringstream s;
+            s << feature.id();
+            lookup_value = s.str();
+            // add this as a proper feature so filtering works later on
+            fprops[id_name_] = feature.id();
+            //fprops[id_name_] = tr_->transcode(lookup_value));
+        }
+        else
+        {
+            std::map<std::string,value>::const_iterator const& itr = fprops.find(join_field_);
+            if (itr != fprops.end())
+            {
+                lookup_value = itr->second.to_string();
+            }
+            else
+            {
+                std::clog << "should not get here: join_field '" << join_field_ << "' not found in feature properties\n";
+            }    
+        }
+
+        // what good is an empty lookup key?
+        if (!lookup_value.empty())
+        {
+            // TODO - consider shortcutting f_keys if feature_id == lookup_value
+            // create a mapping between the pixel id and the feature join_field
+            f_keys_.insert(std::make_pair(feature.id(),lookup_value));
+            // if extra fields have been supplied, push them into grid memory
+            if (!names_.empty()) {
+                // TODO - add ability to push WKT/WKB of geometry into grid storage
+                features_.insert(std::make_pair(lookup_value,fprops));
+            }
+        }
+        else
+        {
+            std::clog << "### Warning: join_field '" << join_field_ << "' was blank for " << feature << "\n";
+        }
+    } 
+    
+    void add_property_name(std::string const& name)
+    {
+        names_.insert(name);
+    } 
+
+    std::set<std::string> property_names() const
+    {
+        return names_;
+    }
+
+    inline const feature_type& get_grid_features() const
+    {
+        return features_;
+    }
+
+    inline feature_type& get_grid_features()
+    {
+        return features_;
+    }
+
+    inline const feature_key_type& get_feature_keys() const
+    {
+        return f_keys_;
+    }
+
+    inline feature_key_type& get_feature_keys()
+    {
+        return f_keys_;
+    }
+
+    inline const std::string& get_join_field() const
+    {
+        return join_field_;
+    }
+
+    inline unsigned int get_step() const
+    {
+        return step_;
+    }
+        
+    inline const data_type& data() const
+    {
+        return data_;
+    }
+    
+    inline data_type& data()
+    {
+        return data_;
+    }
+
+    inline const T* raw_data() const
+    {
+        return data_.getData();
+    }
+
+    inline T* raw_data()
+    {
+        return data_.getData();
+    }
+
+    // TODO - make 'views' generic
+    inline image_view<data_type> get_view(unsigned x,unsigned y, unsigned w,unsigned h)
+    {
+        return image_view<data_type>(x,y,w,h,data_);
+    }
+
+private:
+
+    inline bool checkBounds(unsigned x, unsigned y) const
+    {
+        return (x < width_ && y < height_);
+    }
+
+    hit_grid& operator=(const hit_grid&);
+    
+public:
+    inline void setPixel(int x,int y,value_type feature_id)
+    {
+        if (checkBounds(x,y))
+        {
+            data_(x,y) = feature_id;
+        }
+    }
+    inline unsigned width() const
+    {
+        return width_;
+    }
+
+    inline unsigned height() const
+    {
+        return height_;
+    }
+
+    inline void set_rectangle(value_type id,image_data_32 const& data,int x0,int y0)
+    {
+        box2d<int> ext0(0,0,width_,height_);
+        box2d<int> ext1(x0,y0,x0+data.width(),y0+data.height());
+
+        if (ext0.intersects(ext1))
+        {
+            box2d<int> box = ext0.intersect(ext1);
+            for (int y = box.miny(); y < box.maxy(); ++y)
+            {
+                value_type* row_to =  data_.getRow(y);
+                unsigned int const * row_from = data.getRow(y-y0);
+
+                for (int x = box.minx(); x < box.maxx(); ++x)
+                {
+                    if (row_from[x-x0] & 0xff000000)
+                    {
+                        row_to[x] = id;
+                    }
+                }
+            }
+        }
+    }
+
+};
+
+//typedef uint16_t value_type;
+//typedef unsigned char value_type;
+typedef hit_grid<uint16_t> grid;
+
+}
+#endif //MAPNIK_GRID_HPP

include/mapnik/grid/grid_pixel.hpp

@@ -0,0 +1,170 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_GRID_PIXEL_HPP
+#define MAPNIK_GRID_PIXEL_HPP
+
+#include "agg_basics.h"
+
+namespace mapnik
+{
+
+    //==================================================================gray16
+    struct gray16
+    {
+        typedef agg::int16u value_type;
+        typedef agg::int32u calc_type;
+        typedef agg::int64  long_type;
+        enum base_scale_e
+        {
+            base_shift = 16,
+            base_scale = 1 << base_shift,
+            base_mask  = base_scale - 1
+        };
+        typedef gray16 self_type;
+
+        value_type v;
+        value_type a;
+
+        //--------------------------------------------------------------------
+        gray16() {}
+
+        //--------------------------------------------------------------------
+        gray16(unsigned v_, unsigned a_=base_mask) :
+            v(agg::int16u(v_)), a(agg::int16u(a_)) {}
+
+        //--------------------------------------------------------------------
+        gray16(const self_type& c, unsigned a_) :
+            v(c.v), a(value_type(a_)) {}
+
+        //--------------------------------------------------------------------
+        void clear()
+        {
+            v = a = 0;
+        }
+
+        //--------------------------------------------------------------------
+        const self_type& transparent()
+        {
+            a = 0;
+            return *this;
+        }
+
+        //--------------------------------------------------------------------
+        void opacity(double a_)
+        {
+            if(a_ < 0.0) a_ = 0.0;
+            if(a_ > 1.0) a_ = 1.0;
+            a = (value_type)agg::uround(a_ * double(base_mask));
+        }
+
+        //--------------------------------------------------------------------
+        double opacity() const
+        {
+            return double(a) / double(base_mask);
+        }
+
+
+        //--------------------------------------------------------------------
+        const self_type& premultiply()
+        {
+            if(a == base_mask) return *this;
+            if(a == 0)
+            {
+                v = 0;
+                return *this;
+            }
+            v = value_type((calc_type(v) * a) >> base_shift);
+            return *this;
+        }
+
+        //--------------------------------------------------------------------
+        const self_type& premultiply(unsigned a_)
+        {
+            if(a == base_mask && a_ >= base_mask) return *this;
+            if(a == 0 || a_ == 0)
+            {
+                v = a = 0;
+                return *this;
+            }
+            calc_type v_ = (calc_type(v) * a_) / a;
+            v = value_type((v_ > a_) ? a_ : v_);
+            a = value_type(a_);
+            return *this;
+        }
+
+        //--------------------------------------------------------------------
+        const self_type& demultiply()
+        {
+            if(a == base_mask) return *this;
+            if(a == 0)
+            {
+                v = 0;
+                return *this;
+            }
+            calc_type v_ = (calc_type(v) * base_mask) / a;
+            v = value_type((v_ > base_mask) ? base_mask : v_);
+            return *this;
+        }
+
+        //--------------------------------------------------------------------
+        self_type gradient(self_type c, double k) const
+        {
+            self_type ret;
+            calc_type ik = agg::uround(k * base_scale);
+            ret.v = value_type(calc_type(v) + (((calc_type(c.v) - v) * ik) >> base_shift));
+            ret.a = value_type(calc_type(a) + (((calc_type(c.a) - a) * ik) >> base_shift));
+            return ret;
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void add(const self_type& c, unsigned cover)
+        {
+            calc_type cv, ca;
+            if(cover == agg::cover_mask)
+            {
+                if(c.a == base_mask) 
+                {
+                    *this = c;
+                }
+                else
+                {
+                    cv = v + c.v; v = (cv > calc_type(base_mask)) ? calc_type(base_mask) : cv;
+                    ca = a + c.a; a = (ca > calc_type(base_mask)) ? calc_type(base_mask) : ca;
+                }
+            }
+            else
+            {
+                cv = v + ((c.v * cover + agg::cover_mask/2) >> agg::cover_shift);
+                ca = a + ((c.a * cover + agg::cover_mask/2) >> agg::cover_shift);
+                v = (cv > calc_type(base_mask)) ? calc_type(base_mask) : cv;
+                a = (ca > calc_type(base_mask)) ? calc_type(base_mask) : ca;
+            }
+        }
+
+        //--------------------------------------------------------------------
+        static self_type no_color() { return self_type(0,0); }
+    };
+
+}
+
+#endif

include/mapnik/grid/grid_pixfmt.hpp

@@ -0,0 +1,640 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_GRID_PIXFMT_HPP
+#define MAPNIK_GRID_PIXFMT_HPP
+
+#include <string.h>
+#include "agg_basics.h"
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid_rendering_buffer.hpp>
+
+namespace mapnik
+{
+ 
+    //============================================================blender_gray
+    template<class ColorT> struct blender_gray
+    {
+        typedef ColorT color_type;
+        typedef typename color_type::value_type value_type;
+        typedef typename color_type::calc_type calc_type;
+        enum base_scale_e { base_shift = color_type::base_shift };
+
+        static AGG_INLINE void blend_pix(value_type* p, unsigned cv, 
+                                         unsigned alpha, unsigned cover=0)
+        {
+            *p = (value_type)((((cv - calc_type(*p)) * alpha) + (calc_type(*p) << base_shift)) >> base_shift);
+        }
+    };
+
+
+
+    //=====================================================apply_gamma_dir_gray
+    template<class ColorT, class GammaLut> class apply_gamma_dir_gray
+    {
+    public:
+        typedef typename ColorT::value_type value_type;
+
+        apply_gamma_dir_gray(const GammaLut& gamma) : m_gamma(gamma) {}
+
+        AGG_INLINE void operator () (value_type* p)
+        {
+            *p = m_gamma.dir(*p);
+        }
+
+    private:
+        const GammaLut& m_gamma;
+    };
+
+
+
+    //=====================================================apply_gamma_inv_gray
+    template<class ColorT, class GammaLut> class apply_gamma_inv_gray
+    {
+    public:
+        typedef typename ColorT::value_type value_type;
+
+        apply_gamma_inv_gray(const GammaLut& gamma) : m_gamma(gamma) {}
+
+        AGG_INLINE void operator () (value_type* p)
+        {
+            *p = m_gamma.inv(*p);
+        }
+
+    private:
+        const GammaLut& m_gamma;
+    };
+
+
+
+    //=================================================pixfmt_alpha_blend_gray
+    template<class Blender, class RenBuf, unsigned Step=1, unsigned Offset=0>
+    class pixfmt_alpha_blend_gray
+    {
+    public:
+        typedef RenBuf   rbuf_type;
+        typedef typename rbuf_type::row_data row_data;
+        typedef Blender  blender_type;
+        typedef typename blender_type::color_type color_type;
+        typedef int                               order_type; // A fake one
+        typedef typename color_type::value_type   value_type;
+        typedef typename color_type::calc_type    calc_type;
+        enum base_scale_e 
+        {
+            base_shift = color_type::base_shift,
+            base_scale = color_type::base_scale,
+            base_mask  = color_type::base_mask,
+            pix_width  = sizeof(value_type),
+            pix_step   = Step,
+            pix_offset = Offset
+        };
+
+    private:
+        //--------------------------------------------------------------------
+        static AGG_INLINE void copy_or_blend_pix(value_type* p, 
+                                                 const color_type& c, 
+                                                 unsigned cover)
+        {
+            if (c.a)
+            {
+                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
+                if(alpha == base_mask)
+                {
+                    *p = c.v;
+                }
+                else
+                {
+                    Blender::blend_pix(p, c.v, alpha, cover);
+                }
+            }
+        }
+
+
+        static AGG_INLINE void copy_or_blend_pix(value_type* p, 
+                                                 const color_type& c)
+        {
+            if (c.a)
+            {
+                if(c.a == base_mask)
+                {
+                    *p = c.v;
+                }
+                else
+                {
+                    Blender::blend_pix(p, c.v, c.a);
+                }
+            }
+        }
+
+
+    public:
+        //--------------------------------------------------------------------
+        explicit pixfmt_alpha_blend_gray(rbuf_type& rb) :
+            m_rbuf(&rb)
+        {}
+        void attach(rbuf_type& rb) { m_rbuf = &rb; }
+        //--------------------------------------------------------------------
+
+        template<class PixFmt>
+        bool attach(PixFmt& pixf, int x1, int y1, int x2, int y2)
+        {
+            agg::rect_i r(x1, y1, x2, y2);
+            if(r.clip(agg::rect_i(0, 0, pixf.width()-1, pixf.height()-1)))
+            {
+                int stride = pixf.stride();
+                m_rbuf->attach(pixf.pix_ptr(r.x1, stride < 0 ? r.y2 : r.y1), 
+                               (r.x2 - r.x1) + 1,
+                               (r.y2 - r.y1) + 1,
+                               stride);
+                return true;
+            }
+            return false;
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE unsigned width()  const { return m_rbuf->width();  }
+        AGG_INLINE unsigned height() const { return m_rbuf->height(); }
+        AGG_INLINE int      stride() const { return m_rbuf->stride(); }
+
+        //--------------------------------------------------------------------
+              agg::int8u* row_ptr(int y)       { return m_rbuf->row_ptr(y); }
+        const agg::int8u* row_ptr(int y) const { return m_rbuf->row_ptr(y); }
+        row_data     row(int y)     const { return m_rbuf->row(y); }
+
+        const agg::int8u* pix_ptr(int x, int y) const
+        {
+            return m_rbuf->row_ptr(y) + x * Step + Offset;
+        }
+
+        agg::int8u* pix_ptr(int x, int y)
+        {
+            return m_rbuf->row_ptr(y) + x * Step + Offset;
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE static void make_pix(agg::int8u* p, const color_type& c)
+        {
+            *(value_type*)p = c.v;
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE color_type pixel(int x, int y) const
+        {
+            value_type* p = (value_type*)m_rbuf->row_ptr(y) + x * Step + Offset;
+            return color_type(*p);
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_pixel(int x, int y, const color_type& c)
+        {
+            *((value_type*)m_rbuf->row_ptr(x, y, 1) + x * Step + Offset) = c.v;
+        }
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void blend_pixel(int x, int y, const color_type& c, agg::int8u cover)
+        {
+            copy_or_blend_pix((value_type*)
+                               m_rbuf->row_ptr(x, y, 1) + x * Step + Offset, 
+                               c, 
+                               cover);
+        }
+
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_hline(int x, int y, 
+                                   unsigned len, 
+                                   const color_type& c)
+        {
+            value_type* p = (value_type*)
+                m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
+
+            do
+            {
+                *p = c.v; 
+                p += Step;
+            }
+            while(--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        AGG_INLINE void copy_vline(int x, int y,
+                                   unsigned len, 
+                                   const color_type& c)
+        {
+            do
+            {
+                value_type* p = (value_type*)
+                    m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                *p = c.v;
+            }
+            while(--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_hline(int x, int y,
+                         unsigned len, 
+                         const color_type& c,
+                         agg::int8u cover)
+        {
+            if (c.a)
+            {
+                value_type* p = (value_type*)
+                    m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
+
+                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
+                if(alpha == base_mask)
+                {
+                    do
+                    {
+                        *p = c.v; 
+                        p += Step;
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do
+                    {
+                        Blender::blend_pix(p, c.v, alpha, cover);
+                        p += Step;
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_vline(int x, int y,
+                         unsigned len, 
+                         const color_type& c,
+                         agg::int8u cover)
+        {
+            if (c.a)
+            {
+                value_type* p;
+                calc_type alpha = (calc_type(c.a) * (cover + 1)) >> 8;
+                if(alpha == base_mask)
+                {
+                    do
+                    {
+                        p = (value_type*)
+                            m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                        *p = c.v; 
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do
+                    {
+                        p = (value_type*)
+                            m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                        Blender::blend_pix(p, c.v, alpha, cover);
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_solid_hspan(int x, int y,
+                               unsigned len, 
+                               const color_type& c,
+                               const agg::int8u* covers)
+        {
+            if (c.a)
+            {
+                value_type* p = (value_type*)
+                    m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
+
+                do 
+                {
+                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
+                    if(alpha == base_mask)
+                    {
+                        *p = c.v;
+                    }
+                    else
+                    {
+                        Blender::blend_pix(p, c.v, alpha, *covers);
+                    }
+                    p += Step;
+                    ++covers;
+                }
+                while(--len);
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_solid_vspan(int x, int y,
+                               unsigned len, 
+                               const color_type& c,
+                               const agg::int8u* covers)
+        {
+            if (c.a)
+            {
+                do 
+                {
+                    calc_type alpha = (calc_type(c.a) * (calc_type(*covers) + 1)) >> 8;
+
+                    value_type* p = (value_type*)
+                        m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                    if(alpha == base_mask)
+                    {
+                        *p = c.v;
+                    }
+                    else
+                    {
+                        Blender::blend_pix(p, c.v, alpha, *covers);
+                    }
+                    ++covers;
+                }
+                while(--len);
+            }
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_color_hspan(int x, int y,
+                              unsigned len, 
+                              const color_type* colors)
+        {
+            value_type* p = (value_type*)
+                m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
+
+            do 
+            {
+                *p = colors->v;
+                p += Step;
+                ++colors;
+            }
+            while(--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        void copy_color_vspan(int x, int y,
+                              unsigned len, 
+                              const color_type* colors)
+        {
+            do 
+            {
+                value_type* p = (value_type*)
+                    m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+                *p = colors->v;
+                ++colors;
+            }
+            while(--len);
+        }
+
+
+        //--------------------------------------------------------------------
+        void blend_color_hspan(int x, int y,
+                               unsigned len, 
+                               const color_type* colors,
+                               const agg::int8u* covers,
+                               agg::int8u cover)
+        {
+            value_type* p = (value_type*)
+                m_rbuf->row_ptr(x, y, len) + x * Step + Offset;
+
+            if(covers)
+            {
+                do 
+                {
+                    copy_or_blend_pix(p, *colors++, *covers++);
+                    p += Step;
+                }
+                while(--len);
+            }
+            else
+            {
+                if(cover == 255)
+                {
+                    do 
+                    {
+                        if(colors->a == base_mask)
+                        {
+                            *p = colors->v;
+                        }
+                        else
+                        {
+                            copy_or_blend_pix(p, *colors);
+                        }
+                        p += Step;
+                        ++colors;
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        copy_or_blend_pix(p, *colors++, cover);
+                        p += Step;
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+
+
+        //--------------------------------------------------------------------
+        void blend_color_vspan(int x, int y,
+                               unsigned len, 
+                               const color_type* colors,
+                               const agg::int8u* covers,
+                               agg::int8u cover)
+        {
+            value_type* p;
+            if(covers)
+            {
+                do 
+                {
+                    p = (value_type*)
+                        m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                    copy_or_blend_pix(p, *colors++, *covers++);
+                }
+                while(--len);
+            }
+            else
+            {
+                if(cover == 255)
+                {
+                    do 
+                    {
+                        p = (value_type*)
+                            m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                        if(colors->a == base_mask)
+                        {
+                            *p = colors->v;
+                        }
+                        else
+                        {
+                            copy_or_blend_pix(p, *colors);
+                        }
+                        ++colors;
+                    }
+                    while(--len);
+                }
+                else
+                {
+                    do 
+                    {
+                        p = (value_type*)
+                            m_rbuf->row_ptr(x, y++, 1) + x * Step + Offset;
+
+                        copy_or_blend_pix(p, *colors++, cover);
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class Function> void for_each_pixel(Function f)
+        {
+            unsigned y;
+            for(y = 0; y < height(); ++y)
+            {
+                row_data r = m_rbuf->row(y);
+                if(r.ptr)
+                {
+                    unsigned len = r.x2 - r.x1 + 1;
+
+                    value_type* p = (value_type*)
+                        m_rbuf->row_ptr(r.x1, y, len) + r.x1 * Step + Offset;
+
+                    do
+                    {
+                        f(p);
+                        p += Step;
+                    }
+                    while(--len);
+                }
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class GammaLut> void apply_gamma_dir(const GammaLut& g)
+        {
+            for_each_pixel(apply_gamma_dir_gray<color_type, GammaLut>(g));
+        }
+
+        //--------------------------------------------------------------------
+        template<class GammaLut> void apply_gamma_inv(const GammaLut& g)
+        {
+            for_each_pixel(apply_gamma_inv_gray<color_type, GammaLut>(g));
+        }
+
+        //--------------------------------------------------------------------
+        template<class RenBuf2>
+        void copy_from(const RenBuf2& from, 
+                       int xdst, int ydst,
+                       int xsrc, int ysrc,
+                       unsigned len)
+        {
+            const agg::int8u* p = from.row_ptr(ysrc);
+            if(p)
+            {
+                memmove(m_rbuf->row_ptr(xdst, ydst, len) + xdst * pix_width, 
+                        p + xsrc * pix_width, 
+                        len * pix_width);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class SrcPixelFormatRenderer>
+        void blend_from_color(const SrcPixelFormatRenderer& from, 
+                              const color_type& color,
+                              int xdst, int ydst,
+                              int xsrc, int ysrc,
+                              unsigned len,
+                              agg::int8u cover)
+        {
+            typedef typename SrcPixelFormatRenderer::value_type src_value_type;
+            const src_value_type* psrc = (src_value_type*)from.row_ptr(ysrc);
+            if(psrc)
+            {
+                value_type* pdst = 
+                    (value_type*)m_rbuf->row_ptr(xdst, ydst, len) + xdst;
+                do 
+                {
+                    copy_or_blend_pix(pdst, 
+                                      color, 
+                                      (*psrc * cover + base_mask) >> base_shift);
+                    ++psrc;
+                    ++pdst;
+                }
+                while(--len);
+            }
+        }
+
+        //--------------------------------------------------------------------
+        template<class SrcPixelFormatRenderer>
+        void blend_from_lut(const SrcPixelFormatRenderer& from, 
+                            const color_type* color_lut,
+                            int xdst, int ydst,
+                            int xsrc, int ysrc,
+                            unsigned len,
+                            agg::int8u cover)
+        {
+            typedef typename SrcPixelFormatRenderer::value_type src_value_type;
+            const src_value_type* psrc = (src_value_type*)from.row_ptr(ysrc);
+            if(psrc)
+            {
+                value_type* pdst = 
+                    (value_type*)m_rbuf->row_ptr(xdst, ydst, len) + xdst;
+                do 
+                {
+                    copy_or_blend_pix(pdst, color_lut[*psrc], cover);
+                    ++psrc;
+                    ++pdst;
+                }
+                while(--len);
+            }
+        }
+
+    private:
+        rbuf_type* m_rbuf;
+    };
+
+    typedef blender_gray<gray16> blender_gray16;
+
+    typedef pixfmt_alpha_blend_gray<blender_gray16, 
+            mapnik::grid_rendering_buffer> pixfmt_gray16;     //----pixfmt_gray16
+}
+
+#endif
+

include/mapnik/grid/grid_rasterizer.hpp

@@ -0,0 +1,36 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+//$Id$
+
+#ifndef MAPNIK_GRID_RASTERIZER_HPP
+#define MAPNIK_GRID_RASTERIZER_HPP
+
+#include <boost/utility.hpp>
+#include "agg_rasterizer_scanline_aa.h"
+
+namespace mapnik {
+
+struct grid_rasterizer :  agg::rasterizer_scanline_aa<>, boost::noncopyable {};
+
+}
+
+#endif //MAPNIK_AGG_RASTERIZER_HPP

include/mapnik/grid/grid_renderer.hpp

@@ -0,0 +1,125 @@
+/*****************************************************************************
+ * 
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+
+//$Id$
+
+#ifndef GRID_RENDERER_HPP
+#define GRID_RENDERER_HPP
+
+// mapnik
+#include <mapnik/config.hpp>
+#include <mapnik/feature_style_processor.hpp>
+#include <mapnik/font_engine_freetype.hpp>
+#include <mapnik/label_collision_detector.hpp>
+#include <mapnik/placement_finder.hpp>
+#include <mapnik/map.hpp>
+//#include <mapnik/marker.hpp>
+
+#include <mapnik/grid/grid.hpp>
+
+// boost
+#include <boost/utility.hpp>
+#include <boost/scoped_ptr.hpp>
+
+// FIXME
+// forward declare so that
+// apps using mapnik do not
+// need agg headers
+namespace agg {
+  struct trans_affine;
+}
+
+namespace mapnik {
+
+class marker;
+   
+struct grid_rasterizer;
+   
+template <typename T>
+class MAPNIK_DECL grid_renderer : public feature_style_processor<grid_renderer<T> >,
+                                  private boost::noncopyable
+{
+     
+public:
+    grid_renderer(Map const& m, T & pixmap, double scale_factor=1.0, unsigned offset_x=0, unsigned offset_y=0);
+    ~grid_renderer();
+    void start_map_processing(Map const& map);
+    void end_map_processing(Map const& map);
+    void start_layer_processing(layer const& lay);
+    void end_layer_processing(layer const& lay);
+    void render_marker(Feature const& feature, unsigned int step, const int x, const int y, marker &marker, const agg::trans_affine & tr, double opacity);
+
+    void process(point_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(line_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(line_pattern_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(polygon_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(polygon_pattern_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(raster_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(shield_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(text_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(building_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(markers_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);
+    void process(glyph_symbolizer const& sym,
+                 Feature const& feature,
+                 proj_transform const& prj_trans);    
+    inline bool process(rule::symbolizers const& /*syms*/,
+                        Feature const& /*feature*/,
+                        proj_transform const& /*prj_trans*/)
+    {
+        // grid renderer doesn't support processing of multiple symbolizers.
+        return false;
+    };
+
+private:
+    T & pixmap_;
+    unsigned width_;
+    unsigned height_;
+    double scale_factor_;
+    CoordTransform t_;
+    freetype_engine font_engine_;
+    face_manager<freetype_engine> font_manager_;
+    label_collision_detector4 detector_;
+    boost::scoped_ptr<grid_rasterizer> ras_ptr;
+};
+}
+
+#endif //GRID_RENDERER_HPP

include/mapnik/grid/grid_rendering_buffer.hpp

@@ -0,0 +1,36 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+//$Id$
+
+#ifndef MAPNIK_GRID_RENDERING_BUFFER_HPP
+#define MAPNIK_GRID_RENDERING_BUFFER_HPP
+
+#include <mapnik/grid/grid.hpp>
+#include "agg_rendering_buffer.h"
+
+namespace mapnik {
+
+typedef agg::row_ptr_cache<mapnik::grid::value_type> grid_rendering_buffer;
+
+}
+
+#endif //MAPNIK_AGG_RASTERIZER_HPP

include/mapnik/svg/svg_renderer.hpp

@@ -26,6 +26,7 @@
 #include <mapnik/svg/svg_path_attributes.hpp>
 #include <mapnik/gradient.hpp>
 #include <mapnik/box2d.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
 
 #include <boost/utility.hpp>
 
@@ -343,6 +344,93 @@ public:
         }
     }
 
+    template <typename Rasterizer, typename Scanline, typename Renderer>
+    void render_id(Rasterizer& ras, 
+                Scanline& sl,
+                Renderer& ren, 
+                int feature_id,
+                agg::trans_affine const& mtx, 
+                double opacity,
+                const box2d<double> &symbol_bbox)
+    
+    {
+        using namespace agg;
+        
+        trans_affine transform;
+        curved_stroked_trans_type curved_stroked_trans(curved_stroked_,transform);
+        curved_trans_type         curved_trans(curved_,transform);
+        curved_trans_contour_type curved_trans_contour(curved_trans);
+        
+        curved_trans_contour.auto_detect_orientation(true);
+        
+        for(unsigned i = 0; i < attributes_.size(); ++i)
+        {
+            mapnik::svg::path_attributes const& attr = attributes_[i];
+            if (!attr.visibility_flag)
+                continue;
+
+            transform = attr.transform;
+
+            double bx1,by1,bx2,by2;
+            bounding_rect_single(curved_trans, attr.index, &bx1, &by1, &bx2, &by2);
+            box2d<double> path_bbox(bx1,by1,bx2,by2);
+
+            transform *= mtx;
+            double scl = transform.scale();
+            //curved_.approximation_method(curve_inc);
+            curved_.approximation_scale(scl);
+            curved_.angle_tolerance(0.0);
+            
+            mapnik::gray16 color(feature_id);
+
+            if (attr.fill_flag || attr.fill_gradient.get_gradient_type() != NO_GRADIENT)
+            {
+                ras.reset();
+
+                if(fabs(curved_trans_contour.width()) < 0.0001)
+                {
+                    ras.add_path(curved_trans, attr.index);
+                }
+                else
+                {
+                    curved_trans_contour.miter_limit(attr.miter_limit);
+                    ras.add_path(curved_trans_contour, attr.index);
+                }
+
+                ras.filling_rule(attr.even_odd_flag ? fill_even_odd : fill_non_zero);
+                renderer_solid ren_s(ren);
+                ren_s.color(color);
+                render_scanlines(ras, sl, ren_s);
+            }
+
+            if (attr.stroke_flag || attr.stroke_gradient.get_gradient_type() != NO_GRADIENT)
+            {
+                curved_stroked_.width(attr.stroke_width);
+                //m_curved_stroked.line_join((attr.line_join == miter_join) ? miter_join_round : attr.line_join);
+                curved_stroked_.line_join(attr.line_join);
+                curved_stroked_.line_cap(attr.line_cap);
+                curved_stroked_.miter_limit(attr.miter_limit);
+                curved_stroked_.inner_join(inner_round);
+                curved_stroked_.approximation_scale(scl);
+
+                // If the *visual* line width is considerable we 
+                // turn on processing of curve cusps.
+                //---------------------
+                if(attr.stroke_width * scl > 1.0)
+                {
+                    curved_.angle_tolerance(0.2);
+                }
+                ras.reset();
+                ras.add_path(curved_stroked_trans, attr.index);
+
+                ras.filling_rule(fill_non_zero);
+                renderer_solid ren_s(ren);
+                ren_s.color(color);
+                render_scanlines(ras, sl, ren_s);
+            }
+        }
+    }
+    
 private:
     
     VertexSource &  source_;

src/SConscript

@@ -144,10 +144,14 @@ source = Split(
     metawriter_inmem.cpp
     metawriter_factory.cpp
     mapped_memory_cache.cpp
+    marker_cache.cpp
+    svg_parser.cpp
+    svg_path_parser.cpp
+    svg_points_parser.cpp 
+    svg_transform_parser.cpp
     """   
     )
 
-
 # add the datasource_cache.cpp with custom LIBTOOL flag if needed
 if env['LIBTOOL_SUPPORTS_ADVISE']:
     env3 = lib_env.Clone()
@@ -162,9 +166,9 @@ if env['JPEG']:
         jpeg_reader.cpp
         """)
         
-if True : # agg backend
+# agg backend
-    source += Split(
+source += Split(
-        """
+    """
     agg/agg_renderer.cpp
     agg/process_building_symbolizer.cpp
     agg/process_glyph_symbolizer.cpp
@@ -177,13 +181,46 @@ if True : # agg backend
     agg/process_raster_symbolizer.cpp
     agg/process_shield_symbolizer.cpp
     agg/process_markers_symbolizer.cpp
-    svg_parser.cpp
-    svg_path_parser.cpp
-    svg_points_parser.cpp 
-    svg_transform_parser.cpp
-    marker_cache.cpp
     """ 
-        )
+    )
+
+# grid backend
+source += Split(
+    """
+    grid/grid_renderer.cpp
+    grid/process_building_symbolizer.cpp
+    grid/process_glyph_symbolizer.cpp
+    grid/process_line_pattern_symbolizer.cpp
+    grid/process_line_symbolizer.cpp
+    grid/process_markers_symbolizer.cpp
+    grid/process_point_symbolizer.cpp
+    grid/process_polygon_pattern_symbolizer.cpp
+    grid/process_polygon_symbolizer.cpp
+    grid/process_raster_symbolizer.cpp
+    grid/process_shield_symbolizer.cpp
+    grid/process_text_symbolizer.cpp	
+    """)
+
+if env['SVG_RENDERER']: # svg backend
+    source += Split(
+              """
+      	svg/svg_renderer.cpp
+      	svg/svg_generator.cpp	
+      	svg/svg_output_attributes.cpp
+      	svg/process_symbolizers.cpp
+      	svg/process_building_symbolizer.cpp
+      	svg/process_glyph_symbolizer.cpp
+      	svg/process_line_pattern_symbolizer.cpp
+      	svg/process_line_symbolizer.cpp
+      	svg/process_markers_symbolizer.cpp
+      	svg/process_point_symbolizer.cpp
+      	svg/process_polygon_pattern_symbolizer.cpp
+      	svg/process_polygon_symbolizer.cpp
+      	svg/process_raster_symbolizer.cpp
+      	svg/process_shield_symbolizer.cpp
+      	svg/process_text_symbolizer.cpp	
+      	""")
+    lib_env.Append(CXXFLAGS = '-DSVG_RENDERER')
 
 if env['HAS_CAIRO']:
     # attach libs to library linking environment
@@ -223,27 +260,6 @@ elif env['XMLPARSER'] == 'libxml2' and env['HAS_LIBXML2']:
             source.remove(cpp)
         source.insert(0,env2.SharedObject(cpp))
 
-if env['SVG_RENDERER']: # svg backend
-    source += Split(
-          """
-  	svg/svg_renderer.cpp
-  	svg/svg_generator.cpp	
-  	svg/svg_output_attributes.cpp
-  	svg/process_symbolizers.cpp
-  	svg/process_building_symbolizer.cpp
-  	svg/process_glyph_symbolizer.cpp
-  	svg/process_line_pattern_symbolizer.cpp
-  	svg/process_line_symbolizer.cpp
-  	svg/process_markers_symbolizer.cpp
-  	svg/process_point_symbolizer.cpp
-  	svg/process_polygon_pattern_symbolizer.cpp
-  	svg/process_polygon_symbolizer.cpp
-  	svg/process_raster_symbolizer.cpp
-  	svg/process_shield_symbolizer.cpp
-  	svg/process_text_symbolizer.cpp	
-  	""")
-    lib_env.Append(CXXFLAGS = '-DSVG_RENDERER')
-
 if env['CUSTOM_LDFLAGS']:
     linkflags = '%s %s' % (env['CUSTOM_LDFLAGS'], mapnik_lib_link_flag)
 else:
@@ -299,16 +315,20 @@ else:
 includes = glob.glob('../include/mapnik/*.hpp')
 svg_includes = glob.glob('../include/mapnik/svg/*.hpp')
 wkt_includes = glob.glob('../include/mapnik/wkt/*.hpp')
+grid_includes = glob.glob('../include/mapnik/grid/*.hpp')
 
 inc_target = os.path.normpath(install_prefix+'/include/mapnik')
 svg_inc_target = os.path.normpath(install_prefix+'/include/mapnik/svg')
 wkt_inc_target = os.path.normpath(install_prefix+'/include/mapnik/wkt')
+grid_inc_target = os.path.normpath(install_prefix+'/include/mapnik/grid')
 
 if 'uninstall' not in COMMAND_LINE_TARGETS:
     env.Alias(target='install', source=env.Install(inc_target, includes))
     env.Alias(target='install', source=env.Install(svg_inc_target, svg_includes))
     env.Alias(target='install', source=env.Install(wkt_inc_target, wkt_includes))
+    env.Alias(target='install', source=env.Install(grid_inc_target, grid_includes))
 
 env['create_uninstall_target'](env, inc_target)
 env['create_uninstall_target'](env, svg_inc_target)
 env['create_uninstall_target'](env, wkt_inc_target)
+env['create_uninstall_target'](env, grid_inc_target)

src/grid/grid_renderer.cpp

@@ -0,0 +1,162 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+#include <mapnik/marker_cache.hpp>
+#include <mapnik/unicode.hpp>
+#include <mapnik/placement_finder.hpp>
+#include <mapnik/config_error.hpp>
+#include <mapnik/font_set.hpp>
+#include <mapnik/parse_path.hpp>
+#include <mapnik/text_path.hpp>
+#include <mapnik/svg/svg_converter.hpp>
+#include <mapnik/svg/svg_renderer.hpp>
+#include <mapnik/svg/svg_path_adapter.hpp>
+
+// boost
+#include <boost/utility.hpp>
+
+// stl
+#ifdef MAPNIK_DEBUG
+#include <iostream>
+#endif
+
+//#include <cmath>
+
+namespace mapnik
+{
+
+template <typename T>
+grid_renderer<T>::grid_renderer(Map const& m, T & pixmap, double scale_factor, unsigned offset_x, unsigned offset_y)
+    : feature_style_processor<grid_renderer>(m, scale_factor),
+      pixmap_(pixmap),
+      width_(pixmap_.width()),
+      height_(pixmap_.height()),
+      scale_factor_(scale_factor),
+      t_(pixmap_.width(),pixmap_.width(),m.get_current_extent(),offset_x,offset_y),
+      font_engine_(),
+      font_manager_(font_engine_),
+      detector_(box2d<double>(-m.buffer_size(), -m.buffer_size(), pixmap_.width() + m.buffer_size(), pixmap_.height() + m.buffer_size())),
+      ras_ptr(new grid_rasterizer)
+{
+#ifdef MAPNIK_DEBUG
+    std::clog << "scale=" << m.scale() << "\n";
+#endif
+}
+
+template <typename T>
+grid_renderer<T>::~grid_renderer() {}
+
+template <typename T>
+void grid_renderer<T>::start_map_processing(Map const& map)
+{
+#ifdef MAPNIK_DEBUG
+    std::clog << "start map processing bbox="
+              << map.get_current_extent() << "\n";
+#endif
+    ras_ptr->clip_box(0,0,width_,height_);
+}
+
+template <typename T>
+void grid_renderer<T>::end_map_processing(Map const& )
+{
+#ifdef MAPNIK_DEBUG
+    std::clog << "end map processing\n";
+#endif
+}
+
+template <typename T>
+void grid_renderer<T>::start_layer_processing(layer const& lay)
+{
+#ifdef MAPNIK_DEBUG
+    std::clog << "start layer processing : " << lay.name()  << "\n";
+    std::clog << "datasource = " << lay.datasource().get() << "\n";
+#endif
+    if (lay.clear_label_cache())
+    {
+        detector_.clear();
+    }
+}
+
+template <typename T>
+void grid_renderer<T>::end_layer_processing(layer const&)
+{
+#ifdef MAPNIK_DEBUG
+    std::clog << "end layer processing\n";
+#endif
+}
+
+template <typename T>
+void grid_renderer<T>::render_marker(Feature const& feature, unsigned int step, const int x, const int y, marker &marker, const agg::trans_affine & tr, double opacity)
+{
+    if (marker.is_vector())
+    {
+        typedef coord_transform2<CoordTransform,geometry_type> path_type;
+        typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+        typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+        agg::scanline_u8 sl;
+    
+        grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+        mapnik::pixfmt_gray16 pixf(buf);
+    
+        ren_base renb(pixf);
+        renderer ren(renb);
+    
+        ras_ptr->reset();
+        ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+
+
+        box2d<double> const& bbox = (*marker.get_vector_data())->bounding_box();
+        coord<double,2> c = bbox.center();
+        // center the svg marker on '0,0'
+        agg::trans_affine mtx = agg::trans_affine_translation(-c.x,-c.y);
+        // apply symbol transformation to get to map space
+        mtx *= tr;
+        mtx *= agg::trans_affine_scaling(scale_factor_*(1.0/step));
+        // render the marker at the center of the marker box
+        mtx.translate(x+0.5 * marker.width(), y+0.5 * marker.height());
+
+        vertex_stl_adapter<svg_path_storage> stl_storage((*marker.get_vector_data())->source());
+        svg_path_adapter svg_path(stl_storage);
+        svg_renderer<svg_path_adapter,
+                     agg::pod_bvector<path_attributes>, mapnik::pixfmt_gray16 > svg_renderer(svg_path,
+                             (*marker.get_vector_data())->attributes());
+
+        svg_renderer.render_id(*ras_ptr, sl, renb, feature.id(), mtx, opacity, bbox);
+        
+    }
+    else
+    {
+        pixmap_.set_rectangle(feature.id(), **marker.get_bitmap_data(), x, y);
+    }
+    pixmap_.add_feature(feature);
+}
+
+template class grid_renderer<grid>;
+}

src/grid/process_building_symbolizer.cpp

@@ -0,0 +1,160 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+#include <mapnik/segment.hpp>
+
+// boost
+#include <boost/scoped_ptr.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_u.h"
+#include "agg_conv_stroke.h"
+
+// 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"
+#include "agg_renderer_scanline.h"
+#include "agg_conv_stroke.h"
+*/
+
+namespace mapnik 
+{
+
+template <typename T>
+void grid_renderer<T>::process(building_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef coord_transform2<CoordTransform,geometry_type> path_type;
+    typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    agg::scanline_u8 sl;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+
+    double height = sym.height() * scale_factor_;
+    
+    for (unsigned i=0;i<feature.num_geometries();++i)
+    {
+        geometry_type const& geom = feature.get_geometry(i);
+        if (geom.num_points() > 2)
+        {
+            boost::scoped_ptr<geometry_type> frame(new geometry_type(LineString));
+            boost::scoped_ptr<geometry_type> roof(new geometry_type(Polygon));
+            std::deque<segment_t> face_segments;
+            double x0(0);
+            double y0(0);
+            unsigned cm = geom.vertex(&x0,&y0);
+            for (unsigned j=1;j<geom.num_points();++j)
+            {
+                double x(0);
+                double y(0);
+                cm = geom.vertex(&x,&y);
+                if (cm == SEG_MOVETO)
+                {
+                    frame->move_to(x,y);
+                }
+                else if (cm == SEG_LINETO)
+                {
+                    frame->line_to(x,y);
+                    face_segments.push_back(segment_t(x0,y0,x,y));
+                }
+                
+                x0 = x;
+                y0 = y;
+            }
+            std::sort(face_segments.begin(),face_segments.end(), y_order);
+            std::deque<segment_t>::const_iterator itr=face_segments.begin();
+            for (;itr!=face_segments.end();++itr)
+            {
+                boost::scoped_ptr<geometry_type> faces(new geometry_type(Polygon));
+                faces->move_to(itr->get<0>(),itr->get<1>());
+                faces->line_to(itr->get<2>(),itr->get<3>());
+                faces->line_to(itr->get<2>(),itr->get<3>() + height);
+                faces->line_to(itr->get<0>(),itr->get<1>() + height);
+
+                path_type faces_path (t_,*faces,prj_trans);
+                ras_ptr->add_path(faces_path);
+                ren.color(mapnik::gray16(feature.id()));
+                agg::render_scanlines(*ras_ptr, sl, ren);
+                ras_ptr->reset();
+
+                frame->move_to(itr->get<0>(),itr->get<1>());
+                frame->line_to(itr->get<0>(),itr->get<1>()+height);
+            }
+
+            geom.rewind(0);
+            for (unsigned j=0;j<geom.num_points();++j)
+            {
+                double x,y;
+                unsigned cm = geom.vertex(&x,&y);
+                if (cm == SEG_MOVETO)
+                {
+                    frame->move_to(x,y+height);
+                    roof->move_to(x,y+height);
+                }
+                else if (cm == SEG_LINETO)
+                {
+                    frame->line_to(x,y+height);
+                    roof->line_to(x,y+height);
+                }
+            }
+            path_type path(t_,*frame,prj_trans);
+            agg::conv_stroke<path_type> stroke(path);
+            ras_ptr->add_path(stroke);
+            ren.color(mapnik::gray16(feature.id()));
+            agg::render_scanlines(*ras_ptr, sl, ren);
+            ras_ptr->reset();
+
+            path_type roof_path (t_,*roof,prj_trans);
+            ras_ptr->add_path(roof_path);
+            ren.color(mapnik::gray16(feature.id()));
+            agg::render_scanlines(*ras_ptr, sl, ren);
+        }
+    }
+    pixmap_.add_feature(feature);
+}
+
+template void grid_renderer<grid>::process(building_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}

src/grid/process_glyph_symbolizer.cpp

@@ -0,0 +1,41 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_renderer.hpp>
+#include <iostream>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(glyph_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    std::clog << "grid_renderer does not yet support glyph_symbolizer\n";
+}
+
+template void grid_renderer<grid>::process(glyph_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+}

src/grid/process_line_pattern_symbolizer.cpp

@@ -0,0 +1,93 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_p.h"
+#include "agg_conv_stroke.h"
+#include "agg_conv_dash.h"
+
+// stl
+#include <string>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(line_pattern_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef coord_transform2<CoordTransform,geometry_type> path_type;
+    typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    agg::scanline_p8 sl;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+
+    // TODO - actually handle image dimensions
+    int stroke_width = 2;
+
+    for (unsigned i=0;i<feature.num_geometries();++i)
+    {
+        geometry_type const& geom = feature.get_geometry(i);
+        if (geom.num_points() > 1)
+        {
+            path_type path(t_,geom,prj_trans);
+            agg::conv_stroke<path_type> stroke(path);
+            stroke.generator().miter_limit(4.0);
+            stroke.generator().width(stroke_width * scale_factor_);
+            ras_ptr->add_path(stroke);
+        }
+    }
+
+    // render id
+    ren.color(mapnik::gray16(feature.id()));
+    agg::render_scanlines(*ras_ptr, sl, ren);
+
+    // add feature properties to grid cache
+    pixmap_.add_feature(feature);
+
+}
+
+
+template void grid_renderer<grid>::process(line_pattern_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+ 

src/grid/process_line_symbolizer.cpp

@@ -0,0 +1,153 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_p.h"
+#include "agg_conv_stroke.h"
+#include "agg_conv_dash.h"
+
+// stl
+#include <string>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(line_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef coord_transform2<CoordTransform,geometry_type> path_type;
+    typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    //agg::scanline_u8 sl;
+    agg::scanline_p8 sl;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+
+    stroke const&  stroke_ = sym.get_stroke();
+
+    for (unsigned i=0;i<feature.num_geometries();++i)
+    {
+        geometry_type const& geom = feature.get_geometry(i);
+        if (geom.num_points() > 1)
+        {
+            path_type path(t_,geom,prj_trans);
+
+            if (stroke_.has_dash())
+            {
+                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();
+                for (;itr != end;++itr)
+                {
+                    dash.add_dash(itr->first * scale_factor_, 
+                                  itr->second * scale_factor_);
+                }
+
+                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() * scale_factor_);
+                
+                ras_ptr->add_path(stroke);
+
+            }
+            else
+            {
+                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() * scale_factor_);
+                ras_ptr->add_path(stroke);
+            }
+        }
+    }
+
+    // render id
+    ren.color(mapnik::gray16(feature.id()));
+    agg::render_scanlines(*ras_ptr, sl, ren);
+
+    // add feature properties to grid cache
+    pixmap_.add_feature(feature);
+
+}
+
+
+template void grid_renderer<grid>::process(line_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+ 

src/grid/process_markers_symbolizer.cpp

@@ -0,0 +1,263 @@
+/*****************************************************************************
+ *
+ * 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+#include <mapnik/marker_cache.hpp>
+#include <mapnik/svg/svg_renderer.hpp>
+#include <mapnik/svg/svg_path_adapter.hpp>
+#include <mapnik/markers_placement.hpp>
+#include <mapnik/arrow.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_u.h"
+#include "agg_scanline_p.h"
+#include "agg_path_storage.h"
+#include "agg_ellipse.h"
+#include "agg_conv_stroke.h"
+
+// stl
+#include <algorithm>
+
+
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(markers_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef coord_transform2<CoordTransform,geometry_type> path_type;
+    typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    agg::scanline_u8 sl;
+    agg::scanline_p8 sl_line;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+
+    agg::trans_affine tr;
+    boost::array<double,6> const& m = sym.get_transform();
+    tr.load_from(&m[0]);
+    tr = agg::trans_affine_scaling(scale_factor_*(1.0/pixmap_.get_step())) * tr;
+    std::string filename = path_processor_type::evaluate(*sym.get_filename(), feature);
+    marker_placement_e placement_method = sym.get_marker_placement();
+    marker_type_e marker_type = sym.get_marker_type();
+
+    if (!filename.empty())
+    {
+        boost::optional<marker_ptr> mark = mapnik::marker_cache::instance()->find(filename, true);
+        if (mark && *mark && (*mark)->is_vector())
+        {
+            boost::optional<path_ptr> marker = (*mark)->get_vector_data();
+            box2d<double> const& bbox = (*marker)->bounding_box();
+            double x1 = bbox.minx();
+            double y1 = bbox.miny();
+            double x2 = bbox.maxx();
+            double y2 = bbox.maxy();
+            
+            agg::trans_affine recenter = agg::trans_affine_translation(-0.5*(x1+x2),-0.5*(y1+y2));
+            tr.transform(&x1,&y1);
+            tr.transform(&x2,&y2);
+            box2d<double> extent(x1,y1,x2,y2);
+            using namespace mapnik::svg;
+            vertex_stl_adapter<svg_path_storage> stl_storage((*marker)->source());
+            svg_path_adapter svg_path(stl_storage);
+            svg_renderer<svg_path_adapter, 
+                         agg::pod_bvector<path_attributes>, mapnik::pixfmt_gray16 > svg_renderer(svg_path,(*marker)->attributes());
+
+            bool placed = false;
+            for (unsigned i=0; i<feature.num_geometries(); ++i)
+            {
+                geometry_type const& geom = feature.get_geometry(i);
+                if (geom.num_points() <= 1)
+                {
+                    std::clog << "### Warning svg markers not supported yet for points within markers_symbolizer\n";
+                    continue;
+                } 
+                
+                path_type path(t_,geom,prj_trans);
+                markers_placement<path_type, label_collision_detector4> placement(path, extent, detector_, 
+                                                                                  sym.get_spacing() * scale_factor_, 
+                                                                                  sym.get_max_error(), 
+                                                                                  sym.get_allow_overlap());        
+                double x, y, angle;
+            
+                while (placement.get_point(&x, &y, &angle))
+                {
+                    placed = true;
+                    agg::trans_affine matrix = recenter * tr *agg::trans_affine_rotation(angle) * agg::trans_affine_translation(x, y);
+                    svg_renderer.render_id(*ras_ptr, sl, renb, feature.id(), matrix, sym.get_opacity(),bbox);
+                }
+            }
+            if (placed)
+                pixmap_.add_feature(feature);
+        }
+    }
+    else
+    {
+        stroke const& stroke_ = sym.get_stroke();
+        double strk_width = stroke_.get_width();
+        
+        // clamp to at least 4 px otherwise interactive pixels can be too small
+        double min = static_cast<double>(4/pixmap_.get_step());
+        double w = std::max(sym.get_width()/pixmap_.get_step(),min);
+        double h = std::max(sym.get_height()/pixmap_.get_step(),min);
+    
+        arrow arrow_;
+        box2d<double> extent;
+
+        double dx = w + (2*strk_width);
+        double dy = h + (2*strk_width);
+
+        if (marker_type == ARROW)
+        {
+            extent = arrow_.extent();
+            double x1 = extent.minx();
+            double y1 = extent.miny();
+            double x2 = extent.maxx();
+            double y2 = extent.maxy();
+            tr.transform(&x1,&y1);
+            tr.transform(&x2,&y2);
+            extent.init(x1,y1,x2,y2);
+        }
+        else
+        {
+            double x1 = -1 *(dx);
+            double y1 = -1 *(dy);
+            double x2 = dx;
+            double y2 = dy;
+            tr.transform(&x1,&y1);
+            tr.transform(&x2,&y2);
+            extent.init(x1,y1,x2,y2);
+        }
+    
+        double x;
+        double y;
+        double z=0;
+
+        for (unsigned i=0; i<feature.num_geometries(); ++i)
+        {
+            geometry_type const& geom = feature.get_geometry(i);
+            if (placement_method == MARKER_POINT_PLACEMENT || geom.num_points() <= 1)
+            {
+                geom.label_position(&x,&y);
+                prj_trans.backward(x,y,z);
+                t_.forward(&x,&y);
+                int px = int(floor(x - 0.5 * dx));
+                int py = int(floor(y - 0.5 * dy));
+                box2d<double> label_ext (px, py, px + dx +1, py + dy +1);
+
+                if (sym.get_allow_overlap() ||
+                    detector_.has_placement(label_ext))
+                {
+                    agg::ellipse c(x, y, w, h);
+                    agg::path_storage marker;
+                    marker.concat_path(c);
+                    ras_ptr->add_path(marker);
+                    
+                    // outline
+                    if (strk_width)
+                    {
+                        agg::conv_stroke<agg::path_storage>  outline(marker);
+                        outline.generator().width(strk_width * scale_factor_);
+                        ras_ptr->add_path(outline);
+                    }
+
+                    detector_.insert(label_ext);
+                }
+            }
+            else
+            {
+                
+                agg::path_storage marker;
+                if (marker_type == ARROW)
+                    marker.concat_path(arrow_);
+
+                path_type path(t_,geom,prj_trans);
+                markers_placement<path_type, label_collision_detector4> placement(path, extent, detector_, 
+                                                                                  sym.get_spacing() * scale_factor_, 
+                                                                                  sym.get_max_error(), 
+                                                                                  sym.get_allow_overlap());        
+                double x_t, y_t, angle;
+            
+                while (placement.get_point(&x_t, &y_t, &angle))
+                {
+                    agg::trans_affine matrix;
+
+                    if (marker_type == ELLIPSE)
+                    {
+                        // todo proper bbox - this is buggy
+                        agg::ellipse c(x_t, y_t, w, h);
+                        marker.concat_path(c);
+                        agg::trans_affine matrix;
+                        matrix *= agg::trans_affine_translation(-x_t,-y_t);
+                        matrix *= agg::trans_affine_rotation(angle);
+                        matrix *= agg::trans_affine_translation(x_t,y_t);
+                        marker.transform(matrix);
+                    }
+                    else
+                    {
+                        matrix = tr * agg::trans_affine_rotation(angle) * agg::trans_affine_translation(x_t, y_t);
+                    }
+
+                    agg::conv_transform<agg::path_storage, agg::trans_affine> trans(marker, matrix);
+
+                    // fill
+                    ras_ptr->add_path(trans);
+
+                    // outline
+                    if (strk_width)
+                    {
+                        agg::conv_stroke<agg::conv_transform<agg::path_storage, agg::trans_affine> >  outline(trans);
+                        outline.generator().width(strk_width * scale_factor_);
+                        ras_ptr->add_path(outline);
+                    }
+                }
+            }
+
+        }
+        ren.color(mapnik::gray16(feature.id()));
+        agg::render_scanlines(*ras_ptr, sl, ren);
+        pixmap_.add_feature(feature);
+    }
+}
+
+template void grid_renderer<grid>::process(markers_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+}

src/grid/process_point_symbolizer.cpp

@@ -0,0 +1,99 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+#include <mapnik/marker_cache.hpp>
+
+// stl
+#include <string>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(point_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    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
+    {
+        marker.reset(boost::shared_ptr<mapnik::marker> (new mapnik::marker()));
+    }
+
+    if (marker)
+    {
+        for (unsigned i=0; i<feature.num_geometries(); ++i)
+        {
+            geometry_type const& geom = feature.get_geometry(i);
+            double x;
+            double y;
+            double z=0;
+            if (sym.get_point_placement() == CENTROID_POINT_PLACEMENT)
+                geom.label_position(&x, &y);
+            else
+                geom.label_interior_position(&x, &y);
+
+            prj_trans.backward(x,y,z);
+            t_.forward(&x,&y);
+
+            int w = (*marker)->width();
+            int h = (*marker)->height();
+
+            int px = int(floor(x - 0.5 * w));
+            int py = int(floor(y - 0.5 * h));
+            box2d<double> label_ext (px, py, px + w, py + h);
+            if (sym.get_allow_overlap() ||
+                detector_.has_placement(label_ext))
+            {
+                agg::trans_affine tr;
+                boost::array<double,6> const& m = sym.get_transform();
+                tr.load_from(&m[0]);
+
+                render_marker(feature,pixmap_.get_step(),px,py,**marker,tr, sym.get_opacity());
+
+                if (!sym.get_ignore_placement())
+                    detector_.insert(label_ext);
+            }
+        }
+    }
+
+}
+
+template void grid_renderer<grid>::process(point_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+ 

src/grid/process_polygon_pattern_symbolizer.cpp

@@ -0,0 +1,84 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_u.h"
+
+// stl
+#include <string>
+#include <map>
+
+namespace mapnik {
+
+template <typename T>
+void grid_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<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    agg::scanline_u8 sl;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+    for (unsigned i=0;i<feature.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);
+        }
+    }
+       
+    // render id
+    ren.color(mapnik::gray16(feature.id()));
+    agg::render_scanlines(*ras_ptr, sl, ren);
+
+    // add feature properties to grid cache
+    pixmap_.add_feature(feature);
+}
+
+
+template void grid_renderer<grid>::process(polygon_pattern_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+ 

src/grid/process_polygon_symbolizer.cpp

@@ -0,0 +1,87 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_u.h"
+
+// stl
+#include <string>
+#include <map>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(polygon_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef coord_transform2<CoordTransform,geometry_type> path_type;
+    typedef agg::renderer_base<mapnik::pixfmt_gray16> ren_base;
+    typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
+    agg::scanline_u8 sl;
+
+    grid_rendering_buffer buf(pixmap_.raw_data(), width_, height_, width_);
+    mapnik::pixfmt_gray16 pixf(buf);
+
+    ren_base renb(pixf);
+    renderer ren(renb);
+
+    ras_ptr->reset();
+    ras_ptr->gamma(agg::gamma_linear(0.0, 0.0));
+    for (unsigned i=0;i<feature.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);
+        }
+    }
+       
+    // render id
+    ren.color(mapnik::gray16(feature.id()));
+    agg::render_scanlines(*ras_ptr, sl, ren);
+
+    // add feature properties to grid cache
+    pixmap_.add_feature(feature);
+
+    // increment feature count
+    //++pixmap_.feature_count_;
+}
+
+
+template void grid_renderer<grid>::process(polygon_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+ 

src/grid/process_raster_symbolizer.cpp

@@ -0,0 +1,42 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_renderer.hpp>
+
+namespace mapnik {
+
+
+template <typename T>
+void grid_renderer<T>::process(raster_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    std::clog << "grid_renderer does not yet support raster_symbolizer\n";
+}
+
+template void grid_renderer<grid>::process(raster_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}

src/grid/process_shield_symbolizer.cpp

@@ -0,0 +1,251 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_rasterizer.hpp>
+#include <mapnik/grid/grid_renderer.hpp>
+#include <mapnik/grid/grid_pixfmt.hpp>
+#include <mapnik/grid/grid_pixel.hpp>
+#include <mapnik/grid/grid.hpp>
+
+#include <mapnik/marker_cache.hpp>
+#include <mapnik/svg/svg_converter.hpp>
+#include <mapnik/svg/svg_renderer.hpp>
+#include <mapnik/svg/svg_path_adapter.hpp>
+
+// agg
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_renderer_scanline.h"
+#include "agg_scanline_u.h"
+
+namespace mapnik {
+
+template <typename T>
+void  grid_renderer<T>::process(shield_symbolizer const& sym,
+                               Feature const& feature,
+                               proj_transform const& prj_trans)
+{
+    typedef  coord_transform2<CoordTransform,geometry_type> path_type;
+
+    bool placement_found = false;
+
+    text_placement_info_ptr placement_options = sym.get_placement_options()->get_placement_info();
+    placement_options->next();
+    placement_options->next_position_only();
+
+    UnicodeString text;
+    if( sym.get_no_text() )
+        text = UnicodeString( " " );  // TODO: fix->use 'space' as the text to render
+    else
+    {
+        expression_ptr name_expr = sym.get_name();
+        if (!name_expr) return;
+        value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
+        text = result.to_unicode();
+    }
+    
+    if ( sym.get_text_transform() == UPPERCASE)
+    {
+        text = text.toUpper();
+    }
+    else if ( sym.get_text_transform() == LOWERCASE)
+    {
+        text = text.toLower();
+    }
+    else if ( sym.get_text_transform() == CAPITALIZE)
+    {
+        text = text.toTitle(NULL);
+    }
+    
+    agg::trans_affine tr;
+    boost::array<double,6> const& m = sym.get_transform();
+    tr.load_from(&m[0]);
+    tr = agg::trans_affine_scaling(scale_factor_) * tr;
+    
+    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
+    {
+        marker.reset(boost::shared_ptr<mapnik::marker> (new mapnik::marker()));
+    }
+    
+    if (text.length() > 0 && marker)
+    {
+        face_set_ptr faces;
+
+        if (sym.get_fontset().size() > 0)
+        {
+            faces = font_manager_.get_face_set(sym.get_fontset());
+        }
+        else
+        {
+            faces = font_manager_.get_face_set(sym.get_face_name());
+        }
+
+        stroker_ptr strk = font_manager_.get_stroker();
+        if (strk && faces->size() > 0)
+        {
+            text_renderer<T> ren(pixmap_, faces, *strk);
+
+            ren.set_pixel_size(sym.get_text_size() * scale_factor_ * (1.0/pixmap_.get_step()));
+            ren.set_fill(sym.get_fill());
+            ren.set_halo_fill(sym.get_halo_fill());
+            ren.set_halo_radius(sym.get_halo_radius() * scale_factor_);
+            ren.set_opacity(sym.get_text_opacity());
+
+            placement_finder<label_collision_detector4> finder(detector_);
+
+            string_info info(text);
+
+            faces->get_string_info(info);
+
+            // TODO- clamp to at least 4 px otherwise interactivity is too small
+            int w = (*marker)->width()/pixmap_.get_step();
+            int h = (*marker)->height()/pixmap_.get_step();
+
+            for (unsigned i = 0; i < feature.num_geometries(); ++i)
+            {
+                geometry_type const& geom = feature.get_geometry(i);
+                if (geom.num_points() > 0 )
+                {
+                    path_type path(t_,geom,prj_trans);
+
+                    label_placement_enum how_placed = sym.get_label_placement();
+                    if (how_placed == POINT_PLACEMENT || how_placed == VERTEX_PLACEMENT || how_placed == INTERIOR_PLACEMENT)
+                    {
+                        // for every vertex, try and place a shield/text
+                        geom.rewind(0);
+                        placement text_placement(info, sym, placement_options, scale_factor_, w, h, false);
+                        text_placement.avoid_edges = sym.get_avoid_edges();
+                        text_placement.allow_overlap = sym.get_allow_overlap();
+                        position const& pos = sym.get_displacement();
+                        position const& shield_pos = sym.get_shield_displacement();
+                        for( unsigned jj = 0; jj < geom.num_points(); jj++ )
+                        {
+                            double label_x;
+                            double label_y;
+                            double z=0.0;
+
+                            if( how_placed == VERTEX_PLACEMENT )
+                                geom.vertex(&label_x,&label_y);  // by vertex
+                            else if( how_placed == INTERIOR_PLACEMENT )
+                                geom.label_interior_position(&label_x,&label_y);
+                            else
+                                geom.label_position(&label_x, &label_y);  // by middle of line or by point
+                            prj_trans.backward(label_x,label_y, z);
+                            t_.forward(&label_x,&label_y);
+
+                            label_x += boost::get<0>(shield_pos);
+                            label_y += boost::get<1>(shield_pos);
+
+                            finder.find_point_placement( text_placement,label_x,label_y,0.0,
+                                                         sym.get_vertical_alignment(),
+                                                         sym.get_line_spacing(),
+                                                         sym.get_character_spacing(),
+                                                         sym.get_horizontal_alignment(),
+                                                         sym.get_justify_alignment() );
+
+                            // check to see if image overlaps anything too, there is only ever 1 placement found for points and verticies
+                            if( text_placement.placements.size() > 0)
+                            {
+                                placement_found = true;
+                                double x = floor(text_placement.placements[0].starting_x);
+                                double y = floor(text_placement.placements[0].starting_y);
+                                int px;
+                                int py;
+                                box2d<double> label_ext;
+
+                                if( !sym.get_unlock_image() )
+                                {
+                                    // center image at text center position
+                                    // remove displacement from image label
+                                    double lx = x - boost::get<0>(pos);
+                                    double ly = y - boost::get<1>(pos);
+                                    px=int(floor(lx - (0.5 * w)));
+                                    py=int(floor(ly - (0.5 * h)));
+                                    label_ext.init( floor(lx - 0.5 * w), floor(ly - 0.5 * h), ceil (lx + 0.5 * w), ceil (ly + 0.5 * h) );
+                                }
+                                else
+                                {  // center image at reference location
+                                    px=int(floor(label_x - 0.5 * w));
+                                    py=int(floor(label_y - 0.5 * h));
+                                    label_ext.init( floor(label_x - 0.5 * w), floor(label_y - 0.5 * h), ceil (label_x + 0.5 * w), ceil (label_y + 0.5 * h));
+                                }
+
+                                if ( sym.get_allow_overlap() || detector_.has_placement(label_ext) )
+                                {
+                                    render_marker(feature,pixmap_.get_step(),px,py,**marker,tr,sym.get_opacity());
+
+                                    box2d<double> dim = ren.prepare_glyphs(&text_placement.placements[0]);
+                                    ren.render_id(feature.id(),x,y,2);
+                                    detector_.insert(label_ext);
+                                    finder.update_detector(text_placement);
+                                }
+                            }
+                        }
+                    }
+
+                    else if (geom.num_points() > 1 && how_placed == LINE_PLACEMENT)
+                    {
+                        placement text_placement(info, sym, placement_options, scale_factor_, w, h, true);
+
+                        text_placement.avoid_edges = sym.get_avoid_edges();
+                        finder.find_point_placements<path_type>(text_placement,path);
+
+                        position const&  pos = sym.get_displacement();
+                        for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
+                        {
+                            placement_found= true;
+                            double x = floor(text_placement.placements[ii].starting_x);
+                            double y = floor(text_placement.placements[ii].starting_y);
+
+                            double lx = x - boost::get<0>(pos);
+                            double ly = y - boost::get<1>(pos);
+                            int px=int(floor(lx - (0.5*w)));
+                            int py=int(floor(ly - (0.5*h)));
+
+                            render_marker(feature,pixmap_.get_step(),px,py,**marker,tr,sym.get_opacity());
+
+                            box2d<double> dim = ren.prepare_glyphs(&text_placement.placements[ii]);
+                            ren.render_id(feature.id(),x,y,2);
+                        }
+                        finder.update_detector(text_placement);
+                    }
+                }
+            }
+        }
+    }
+    if (placement_found)
+        pixmap_.add_feature(feature);
+    
+}
+
+template void grid_renderer<grid>::process(shield_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}

src/grid/process_text_symbolizer.cpp

@@ -0,0 +1,156 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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/grid/grid_renderer.hpp>
+#include <mapnik/font_engine_freetype.hpp>
+
+namespace mapnik {
+
+template <typename T>
+void grid_renderer<T>::process(text_symbolizer const& sym,
+                              Feature const& feature,
+                              proj_transform const& prj_trans)
+{
+    typedef  coord_transform2<CoordTransform,geometry_type> path_type;
+
+    bool placement_found = false;
+    text_placement_info_ptr placement_options = sym.get_placement_options()->get_placement_info();
+    while (!placement_found && placement_options->next())
+    {
+        expression_ptr name_expr = sym.get_name();
+        if (!name_expr) return;
+        value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
+        UnicodeString text = result.to_unicode();
+
+        if ( sym.get_text_transform() == UPPERCASE)
+        {
+            text = text.toUpper();
+        }
+        else if ( sym.get_text_transform() == LOWERCASE)
+        {
+            text = text.toLower();
+        }
+        else if ( sym.get_text_transform() == CAPITALIZE)
+        {
+            text = text.toTitle(NULL);
+        }
+
+        if ( text.length() <= 0 ) continue;
+        color const& fill = sym.get_fill();
+
+        face_set_ptr faces;
+
+        if (sym.get_fontset().size() > 0)
+        {
+            faces = font_manager_.get_face_set(sym.get_fontset());
+        }
+        else
+        {
+            faces = font_manager_.get_face_set(sym.get_face_name());
+        }
+
+        stroker_ptr strk = font_manager_.get_stroker();
+        if (!(faces->size() > 0 && strk))
+        {
+            throw config_error("Unable to find specified font face '" + sym.get_face_name() + "'");
+        }
+        text_renderer<T> ren(pixmap_, faces, *strk);
+        ren.set_pixel_size(placement_options->text_size * (scale_factor_ * (1.0/pixmap_.get_step())));
+        ren.set_fill(fill);
+        ren.set_halo_fill(sym.get_halo_fill());
+        ren.set_halo_radius(sym.get_halo_radius() * scale_factor_);
+        ren.set_opacity(sym.get_text_opacity());
+
+        // /pixmap_.get_step() ?
+        box2d<double> dims(0,0,width_,height_);
+        placement_finder<label_collision_detector4> finder(detector_,dims);
+
+        string_info info(text);
+
+        faces->get_string_info(info);
+        unsigned num_geom = feature.num_geometries();
+        for (unsigned i=0; i<num_geom; ++i)
+        {
+            geometry_type const& geom = feature.get_geometry(i);
+            if (geom.num_points() == 0) continue; // don't bother with empty geometries
+            while (!placement_found && placement_options->next_position_only())
+            {
+                placement text_placement(info, sym, placement_options, scale_factor_);
+                text_placement.avoid_edges = sym.get_avoid_edges();
+                if (sym.get_label_placement() == POINT_PLACEMENT ||
+                        sym.get_label_placement() == INTERIOR_PLACEMENT)
+                {
+                    double label_x, label_y, z=0.0;
+                    if (sym.get_label_placement() == POINT_PLACEMENT)
+                        geom.label_position(&label_x, &label_y);
+                    else
+                        geom.label_interior_position(&label_x, &label_y);
+                    prj_trans.backward(label_x,label_y, z);
+                    t_.forward(&label_x,&label_y);
+
+                    double angle = 0.0;
+                    expression_ptr angle_expr = sym.get_orientation();
+                    if (angle_expr)
+                    {
+                        // apply rotation
+                        value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*angle_expr);
+                        angle = result.to_double();
+                    }
+
+                    finder.find_point_placement(text_placement,label_x,label_y,
+                                                angle, sym.get_vertical_alignment(),sym.get_line_spacing(),
+                                                sym.get_character_spacing(),sym.get_horizontal_alignment(),
+                                                sym.get_justify_alignment());
+
+                    finder.update_detector(text_placement);
+                }
+                else if ( geom.num_points() > 1 && sym.get_label_placement() == LINE_PLACEMENT)
+                {
+                    path_type path(t_,geom,prj_trans);
+                    finder.find_line_placements<path_type>(text_placement,path);
+                }
+
+                if (!text_placement.placements.size()) continue;
+                placement_found = true;
+
+                for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ii)
+                {
+                    double x = text_placement.placements[ii].starting_x;
+                    double y = text_placement.placements[ii].starting_y;
+                    ren.prepare_glyphs(&text_placement.placements[ii]);
+                    ren.render_id(feature.id(),x,y,2);
+                }
+            }
+        }
+    }
+    if (placement_found)
+        pixmap_.add_feature(feature);
+}
+
+template void grid_renderer<grid>::process(text_symbolizer const&,
+                                              Feature const&,
+                                              proj_transform const&);
+
+}
+