From f0bc1064c6c0ba6da1e9f5f4495126ad59fed4fa Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Wed, 14 Mar 2012 17:38:27 +0000
Subject: [PATCH] + supprt polygon smoothing in cairo backend

---
 src/cairo_renderer.cpp | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/src/cairo_renderer.cpp b/src/cairo_renderer.cpp
index c900491a6..7f10d8cba 100644
--- a/src/cairo_renderer.cpp
+++ b/src/cairo_renderer.cpp
@@ -53,6 +53,7 @@
 // agg
 #include "agg_conv_clip_polyline.h"
 #include "agg_conv_clip_polygon.h"
+#include "agg_conv_smooth_poly1.h"
 
 // stl
 #ifdef MAPNIK_DEBUG
@@ -725,23 +726,37 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                                       proj_transform const& prj_trans)
     {
 
-        typedef agg::conv_clip_polygon<geometry_type> clipped_geometry_type;
-        typedef coord_transform2<CoordTransform,clipped_geometry_type> path_type;
-
         cairo_context context(context_);
-
         context.set_color(sym.get_fill(), sym.get_opacity());
-
+        box2d<double> inflated_extent = query_extent_ * 1.1;
         for (unsigned i = 0; i < feature->num_geometries(); ++i)
         {
             geometry_type & geom = feature->get_geometry(i);
             if (geom.num_points() > 2)
             {
-                clipped_geometry_type clipped(geom);
-                clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
-                path_type path(t_,clipped,prj_trans);
-                context.add_path(path);
-                context.fill();
+                if (sym.smooth() > 0.0)
+                {
+                    typedef agg::conv_clip_polygon<geometry_type> clipped_geometry_type;
+                    typedef coord_transform2<CoordTransform,clipped_geometry_type> path_type;
+                    typedef agg::conv_smooth_poly1_curve<path_type> smooth_type;
+                    clipped_geometry_type clipped(geom);
+                    clipped.clip_box(inflated_extent.minx(),inflated_extent.miny(),inflated_extent.maxx(),inflated_extent.maxy());
+                    path_type path(t_,clipped,prj_trans);
+                    smooth_type smooth(path);
+                    smooth.smooth_value(sym.smooth());
+                    context.add_agg_path(smooth);
+                    context.fill();
+                }
+                else
+                {
+                    typedef agg::conv_clip_polygon<geometry_type> clipped_geometry_type;
+                    typedef coord_transform2<CoordTransform,clipped_geometry_type> path_type;
+                    clipped_geometry_type clipped(geom);
+                    clipped.clip_box(query_extent_.minx(),query_extent_.miny(),query_extent_.maxx(),query_extent_.maxy());
+                    path_type path(t_,clipped,prj_trans);
+                    context.add_path(path);
+                    context.fill();
+                }
             }
         }
     }