From a953d535adf46da4cad6a8824de881ec248b8d88 Mon Sep 17 00:00:00 2001
From: Hermann Kraus <hermr2d2@gmail.com>
Date: Sat, 28 Jul 2012 16:34:44 +0200
Subject: [PATCH] Use pixel_position consistently everywhere.

---
 bindings/python/mapnik_shield_symbolizer.cpp | 10 +++---
 bindings/python/mapnik_text_placement.cpp    |  4 +--
 include/mapnik/box2d.hpp                     |  1 +
 include/mapnik/pixel_position.hpp            | 37 ++++++++++++++++++++
 include/mapnik/shield_symbolizer.hpp         |  4 +--
 include/mapnik/symbolizer_helpers.hpp        | 19 ++++------
 include/mapnik/text/placement_finder_ng.hpp  |  2 +-
 include/mapnik/text_properties.hpp           |  4 +--
 include/mapnik/text_symbolizer.hpp           |  4 +--
 src/save_map.cpp                             | 10 +++---
 src/shield_symbolizer.cpp                    |  4 +--
 src/symbolizer_helpers.cpp                   | 36 +++++++++----------
 src/text/placement_finder_ng.cpp             | 34 ++++++++++--------
 src/text_placements/simple.cpp               | 20 +++++------
 src/text_properties.cpp                      | 12 +++----
 src/text_symbolizer.cpp                      |  6 ++--
 16 files changed, 119 insertions(+), 88 deletions(-)

diff --git a/bindings/python/mapnik_shield_symbolizer.cpp b/bindings/python/mapnik_shield_symbolizer.cpp
index 28ae7083e..913fbedb2 100644
--- a/bindings/python/mapnik_shield_symbolizer.cpp
+++ b/bindings/python/mapnik_shield_symbolizer.cpp
@@ -39,7 +39,7 @@ using mapnik::path_expression_ptr;
 using mapnik::guess_type;
 using mapnik::expression_ptr;
 using mapnik::parse_path;
-using mapnik::position;
+using mapnik::pixel_position;
 
 
 namespace {
@@ -47,8 +47,8 @@ using namespace boost::python;
 
 tuple get_shield_displacement(const shield_symbolizer& s)
 {
-    position const& pos = s.get_shield_displacement();
-    return boost::python::make_tuple(pos.first, pos.second);
+    pixel_position const& pos = s.get_shield_displacement();
+    return boost::python::make_tuple(pos.x, pos.y);
 }
 
 void set_shield_displacement(shield_symbolizer & s, boost::python::tuple arg)
@@ -58,8 +58,8 @@ void set_shield_displacement(shield_symbolizer & s, boost::python::tuple arg)
 
 tuple get_text_displacement(const shield_symbolizer& t)
 {
-    position const& pos = t.get_displacement();
-    return boost::python::make_tuple(pos.first, pos.second);
+    pixel_position const& pos = t.get_displacement();
+    return boost::python::make_tuple(pos.x, pos.y);
 }
 
 void set_text_displacement(shield_symbolizer & t, boost::python::tuple arg)
diff --git a/bindings/python/mapnik_text_placement.cpp b/bindings/python/mapnik_text_placement.cpp
index f91a985f6..d4bcdb5bc 100644
--- a/bindings/python/mapnik_text_placement.cpp
+++ b/bindings/python/mapnik_text_placement.cpp
@@ -56,7 +56,7 @@ using namespace boost::python;
 
 boost::python::tuple get_displacement(text_symbolizer_properties const& t)
 {
-    return boost::python::make_tuple(t.displacement.first, t.displacement.second);
+    return boost::python::make_tuple(t.displacement.x, t.displacement.y);
 }
 
 void set_displacement(text_symbolizer_properties &t, boost::python::tuple arg)
@@ -72,7 +72,7 @@ void set_displacement(text_symbolizer_properties &t, boost::python::tuple arg)
 
     double x = extract<double>(arg[0]);
     double y = extract<double>(arg[1]);
-    t.displacement = std::make_pair(x, y);
+    t.displacement.set(x, y);
 }
 
 
diff --git a/include/mapnik/box2d.hpp b/include/mapnik/box2d.hpp
index fa52573fb..828106901 100644
--- a/include/mapnik/box2d.hpp
+++ b/include/mapnik/box2d.hpp
@@ -26,6 +26,7 @@
 // mapnik
 #include <mapnik/config.hpp>
 #include <mapnik/coord.hpp>
+#include <mapnik/pixel_position.hpp>
 
 // boost
 #include <boost/operators.hpp>
diff --git a/include/mapnik/pixel_position.hpp b/include/mapnik/pixel_position.hpp
index db75d7fb8..ee599c498 100644
--- a/include/mapnik/pixel_position.hpp
+++ b/include/mapnik/pixel_position.hpp
@@ -22,6 +22,9 @@
 #ifndef MAPNIK_PIXEL_POSITION_HPP
 #define MAPNIK_PIXEL_POSITION_HPP
 
+namespace mapnik
+{
+
 /** Store a pixel position. */
 struct pixel_position
 {
@@ -29,6 +32,40 @@ struct pixel_position
     double y;
     pixel_position(double x, double y) : x(x), y(y) { }
     pixel_position() : x(0), y(0) { }
+    pixel_position operator+ (pixel_position const& other)
+    {
+        return pixel_position(x + other.x, y + other.y);
+    }
+
+    pixel_position operator- (pixel_position const& other)
+    {
+        return pixel_position(x - other.x, y - other.y);
+    }
+
+    pixel_position operator* (double other)
+    {
+        return pixel_position(x * other, y * other);
+    }
+
+    void set(double x_, double y_)
+    {
+        x = x_;
+        y = y_;
+    }
+
+    void clear()
+    {
+        x = 0;
+        y = 0;
+    }
 };
 
+inline pixel_position operator* (double factor, pixel_position const& pos)
+{
+    return pixel_position(factor * pos.x, factor * pos.y);
+}
+
+}
+
+
 #endif // MAPNIK_PIXEL_POSITION_HPP
diff --git a/include/mapnik/shield_symbolizer.hpp b/include/mapnik/shield_symbolizer.hpp
index 85322f48e..15f1124e5 100644
--- a/include/mapnik/shield_symbolizer.hpp
+++ b/include/mapnik/shield_symbolizer.hpp
@@ -52,11 +52,11 @@ struct MAPNIK_DECL shield_symbolizer : public text_symbolizer,
     bool get_unlock_image() const;              // image is not locked to the text placement
     void set_unlock_image(bool unlock_image);
     void set_shield_displacement(double shield_dx, double shield_dy);
-    position const& get_shield_displacement() const;
+    pixel_position const& get_shield_displacement() const;
 
 private:
     bool unlock_image_;
-    position shield_displacement_;
+    pixel_position shield_displacement_;
 };
 }
 
diff --git a/include/mapnik/symbolizer_helpers.hpp b/include/mapnik/symbolizer_helpers.hpp
index 801025f4b..32183f832 100644
--- a/include/mapnik/symbolizer_helpers.hpp
+++ b/include/mapnik/symbolizer_helpers.hpp
@@ -84,9 +84,9 @@ protected:
     /** Geometry currently being processed. */
     std::list<geometry_type*>::iterator geo_itr_;
     /** Remaining points to be processed. */
-    std::list<position> points_;
+    std::list<pixel_position> points_;
     /** Point currently being processed. */
-    std::list<position>::iterator point_itr_;
+    std::list<pixel_position>::iterator point_itr_;
     /** Use point placement. Otherwise line placement is used. */
     bool point_placement_;
     /** Place text at points on a line instead of following the line (used for ShieldSymbolizer) .*/
@@ -116,14 +116,9 @@ public:
         return marker_ext_;
     }
 
-    double get_marker_height() const
+    pixel_position get_marker_size() const
     {
-        return marker_h_;
-    }
-
-    double get_marker_width() const
-    {
-        return marker_w_;
+        return marker_size_;
     }
 
     bool next();
@@ -138,10 +133,8 @@ protected:
     box2d<double> marker_ext_;
     boost::optional<marker_ptr> marker_;
     agg::trans_affine image_transform_;
-    double marker_w_;
-    double marker_h_;
-    double marker_x_;
-    double marker_y_;
+    pixel_position marker_size_;
+    pixel_position marker_pos_;
     
     using text_symbolizer_helper<FaceManagerT, DetectorT>::geometries_to_process_;
     using text_symbolizer_helper<FaceManagerT, DetectorT>::placement_;
diff --git a/include/mapnik/text/placement_finder_ng.hpp b/include/mapnik/text/placement_finder_ng.hpp
index f25d685b1..c0a56f31f 100644
--- a/include/mapnik/text/placement_finder_ng.hpp
+++ b/include/mapnik/text/placement_finder_ng.hpp
@@ -97,7 +97,7 @@ public:
                         face_manager_freetype & font_manager);
 
     /** Try to place a single label at the given point. */
-    glyph_positions_ptr find_point_placement(double pos_x, double pos_y);
+    glyph_positions_ptr find_point_placement(pixel_position pos);
 
     bool next_position();
 private:
diff --git a/include/mapnik/text_properties.hpp b/include/mapnik/text_properties.hpp
index c155ceffa..b5f4433f8 100644
--- a/include/mapnik/text_properties.hpp
+++ b/include/mapnik/text_properties.hpp
@@ -29,6 +29,7 @@
 #include <mapnik/enumeration.hpp>
 #include <mapnik/expression.hpp>
 #include <mapnik/formatting/base.hpp>
+#include <mapnik/pixel_position.hpp>
 
 // stl
 #include <map>
@@ -118,7 +119,6 @@ enum justify_alignment
 
 DEFINE_ENUM(justify_alignment_e, justify_alignment);
 
-typedef std::pair<double, double> position;
 class text_layout;
 
 
@@ -147,7 +147,7 @@ struct text_symbolizer_properties
 
     //Per symbolizer options
     expression_ptr orientation;
-    position displacement;
+    pixel_position displacement;
     label_placement_e label_placement;
     horizontal_alignment_e halign;
     justify_alignment_e jalign;
diff --git a/include/mapnik/text_symbolizer.hpp b/include/mapnik/text_symbolizer.hpp
index 05a9c2a39..125591ab3 100644
--- a/include/mapnik/text_symbolizer.hpp
+++ b/include/mapnik/text_symbolizer.hpp
@@ -105,8 +105,8 @@ struct MAPNIK_DECL text_symbolizer : public symbolizer_base
     void set_vertical_alignment(vertical_alignment_e valign);
     vertical_alignment_e get_vertical_alignment() const func_deprecated;
     void set_displacement(double x, double y);
-    void set_displacement(position const& p);
-    position const& get_displacement() const func_deprecated;
+    void set_displacement(pixel_position const& p);
+    pixel_position const& get_displacement() const func_deprecated;
     void set_avoid_edges(bool avoid);
     bool get_avoid_edges() const func_deprecated;
     void set_minimum_distance(double distance);
diff --git a/src/save_map.cpp b/src/save_map.cpp
index 0151ff2a7..6dae344db 100644
--- a/src/save_map.cpp
+++ b/src/save_map.cpp
@@ -205,14 +205,14 @@ public:
         {
             set_attr(sym_node, "text-opacity", sym.get_text_opacity());
         }
-        position displacement = sym.get_shield_displacement();
-        if (displacement.first != dfl.get_shield_displacement().first || explicit_defaults_)
+        pixel_position displacement = sym.get_shield_displacement();
+        if (displacement.x != dfl.get_shield_displacement().x || explicit_defaults_)
         {
-            set_attr(sym_node, "shield-dx", displacement.first);
+            set_attr(sym_node, "shield-dx", displacement.x);
         }
-        if (displacement.second != dfl.get_shield_displacement().second || explicit_defaults_)
+        if (displacement.y != dfl.get_shield_displacement().y || explicit_defaults_)
         {
-            set_attr(sym_node, "shield-dy", displacement.second);
+            set_attr(sym_node, "shield-dy", displacement.y);
         }
         serialize_symbolizer_base(sym_node, sym);
     }
diff --git a/src/shield_symbolizer.cpp b/src/shield_symbolizer.cpp
index 17238953b..5a60eefa9 100644
--- a/src/shield_symbolizer.cpp
+++ b/src/shield_symbolizer.cpp
@@ -79,10 +79,10 @@ bool shield_symbolizer::get_unlock_image() const
 
 void shield_symbolizer::set_shield_displacement(double shield_dx,double shield_dy)
 {
-    shield_displacement_ = std::make_pair(shield_dx, shield_dy);
+    shield_displacement_.set(shield_dx, shield_dy);
 }
 
-position const& shield_symbolizer::get_shield_displacement() const
+pixel_position const& shield_symbolizer::get_shield_displacement() const
 {
     return shield_displacement_;
 }
diff --git a/src/symbolizer_helpers.cpp b/src/symbolizer_helpers.cpp
index 56e604d98..f1a6b4513 100644
--- a/src/symbolizer_helpers.cpp
+++ b/src/symbolizer_helpers.cpp
@@ -117,7 +117,7 @@ glyph_positions_ptr text_symbolizer_helper<FaceManagerT, DetectorT>::next_point_
             point_itr_ = points_.begin();
             continue; //Reexecute size check
         }
-        glyph_positions_ptr glyphs = finder_.find_point_placement(point_itr_->first, point_itr_->second);
+        glyph_positions_ptr glyphs = finder_.find_point_placement(*point_itr_);
         if (glyphs)
         {
             //Found a placement
@@ -215,7 +215,7 @@ void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_points()
                 geom.vertex(&label_x, &label_y);
                 prj_trans_.backward(label_x, label_y, z);
                 t_.forward(&label_x, &label_y);
-                points_.push_back(std::make_pair(label_x, label_y));
+                points_.push_back(pixel_position(label_x, label_y));
             }
         }
         else
@@ -234,7 +234,7 @@ void text_symbolizer_helper<FaceManagerT, DetectorT>::initialize_points()
             }
             prj_trans_.backward(label_x, label_y, z);
             t_.forward(&label_x, &label_y);
-            points_.push_back(std::make_pair(label_x, label_y));
+            points_.push_back(pixel_position(label_x, label_y));
         }
     }
     point_itr_ = points_.begin();
@@ -275,7 +275,7 @@ bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next()
 template <typename FaceManagerT, typename DetectorT>
 bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
 {
-    position const& shield_pos = sym_.get_shield_displacement();
+    pixel_position const& shield_pos = sym_.get_shield_displacement();
     while (!points_.empty())
     {
         if (point_itr_ == points_.end())
@@ -286,11 +286,10 @@ bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
             point_itr_ = points_.begin();
             continue; //Reexecute size check
         }
-        position const& text_disp = placement_->properties.displacement;
-        double label_x = point_itr_->first + shield_pos.first;
-        double label_y = point_itr_->second + shield_pos.second;
+        pixel_position const& text_disp = placement_->properties.displacement;
+        pixel_position label_pos = *point_itr_ + shield_pos;
 
-        glyph_positions_ptr glyphs = finder_.find_point_placement(label_x, label_y);
+        glyph_positions_ptr glyphs = finder_.find_point_placement(label_pos);
         if (!glyphs)
         {
             //No placement for this point. Keep it in points_ for next try.
@@ -314,9 +313,8 @@ bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
         }
         else
         {  // center image at reference location
-            marker_x_ = label_x - 0.5 * marker_w_;
-            marker_y_ = label_y - 0.5 * marker_h_;
-            marker_ext_.re_center(label_x, label_y);
+            marker_pos_ = label_pos - 0.5 * marker_size_;
+            marker_ext_.re_center(label_pos.x, label_pos.y);
         }
 
         if (placement_->properties.allow_overlap || detector_.has_placement(marker_ext_))
@@ -343,7 +341,7 @@ bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
 template <typename FaceManagerT, typename DetectorT>
 bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
 {
-    position const& pos = placement_->properties.displacement;
+    pixel_position const& pos = placement_->properties.displacement;
 #if 0
     finder_->additional_boxes.clear();
     //Markers are automatically centered
@@ -368,17 +366,15 @@ void shield_symbolizer_helper<FaceManagerT, DetectorT>::init_marker()
         marker_ = marker_cache::instance()->find(filename, true);
     }
     if (!marker_) {
-        marker_w_ = 0;
-        marker_h_ = 0;
+        marker_size_.clear();
         marker_ext_.init(0, 0, 0, 0);
         return;
     }
-    marker_w_ = (*marker_)->width();
-    marker_h_ = (*marker_)->height();
-    double px0 = - 0.5 * marker_w_;
-    double py0 = - 0.5 * marker_h_;
-    double px1 = 0.5 * marker_w_;
-    double py1 = 0.5 * marker_h_;
+    marker_size_.set((*marker_)->width(), (*marker_)->height());
+    double px0 = - 0.5 * marker_size_.x;
+    double py0 = - 0.5 * marker_size_.y;
+    double px1 = 0.5 * marker_size_.x;
+    double py1 = 0.5 * marker_size_.y;
     double px2 = px1;
     double py2 = py0;
     double px3 = px0;
diff --git a/src/text/placement_finder_ng.cpp b/src/text/placement_finder_ng.cpp
index 183e82f85..be4e98a05 100644
--- a/src/text/placement_finder_ng.cpp
+++ b/src/text/placement_finder_ng.cpp
@@ -36,15 +36,6 @@ placement_finder_ng::placement_finder_ng(Feature const& feature, DetectorType &d
 {
 }
 
-glyph_positions_ptr placement_finder_ng::find_point_placement(double pos_x, double pos_y)
-{
-    glyph_positions_ptr glyphs = boost::make_shared<glyph_positions>();
-//    glyphs->point_placement(pixel_position(pos_x, pos_y));
-    //TODO: angle
-    //TODO: Check for placement
-    return glyphs;
-}
-
 bool placement_finder_ng::next_position()
 {
     if (!valid_)
@@ -79,10 +70,10 @@ void placement_finder_ng::init_alignment()
     valign_ = p.valign;
     if (valign_ == V_AUTO)
     {
-        if (p.displacement.second > 0.0)
+        if (p.displacement.y > 0.0)
         {
             valign_ = V_BOTTOM;
-        } else if (p.displacement.second < 0.0)
+        } else if (p.displacement.y < 0.0)
         {
             valign_ = V_TOP;
         } else
@@ -94,10 +85,10 @@ void placement_finder_ng::init_alignment()
     halign_ = p.halign;
     if (halign_ == H_AUTO)
     {
-        if (p.displacement.first > 0.0)
+        if (p.displacement.x > 0.0)
         {
             halign_ = H_RIGHT;
-        } else if (p.displacement.first < 0.0)
+        } else if (p.displacement.x < 0.0)
         {
             halign_ = H_LEFT;
         } else
@@ -109,10 +100,10 @@ void placement_finder_ng::init_alignment()
     jalign_ = p.jalign;
     if (jalign_ == J_AUTO)
     {
-        if (p.displacement.first > 0.0)
+        if (p.displacement.x > 0.0)
         {
             jalign_ = J_LEFT;
-        } else if (p.displacement.first < 0.0)
+        } else if (p.displacement.x < 0.0)
         {
             jalign_ = J_RIGHT;
         } else {
@@ -121,6 +112,19 @@ void placement_finder_ng::init_alignment()
     }
 }
 
+glyph_positions_ptr placement_finder_ng::find_point_placement(pixel_position pos)
+{
+    glyph_positions_ptr glyphs = boost::make_shared<glyph_positions>();
+    glyphs->set_base_point(pos + info_->properties.displacement);
+//    glyphs->point_placement(pixel_position(pos_x, pos_y));
+    //TODO: angle
+    //TODO: Check for placement
+    return glyphs;
+}
+
+
+/*********************************************************************************************/
+
 
 glyph_positions::glyph_positions()
     : base_point_(), const_angle_(true)
diff --git a/src/text_placements/simple.cpp b/src/text_placements/simple.cpp
index 36a996580..fe28dedee 100644
--- a/src/text_placements/simple.cpp
+++ b/src/text_placements/simple.cpp
@@ -62,8 +62,8 @@ bool text_placement_info_simple::next()
 
 bool text_placement_info_simple::next_position_only()
 {
-    const position &pdisp = parent_->defaults.displacement;
-    position &displacement = properties.displacement;
+    pixel_position const& pdisp = parent_->defaults.displacement;
+    pixel_position &displacement = properties.displacement;
     if (position_state >= parent_->direction_.size()) return false;
     directions_t dir = parent_->direction_[position_state];
     switch (dir) {
@@ -71,28 +71,28 @@ bool text_placement_info_simple::next_position_only()
         displacement = pdisp;
         break;
     case NORTH:
-        displacement = std::make_pair(0, -abs(pdisp.second));
+        displacement.set(0, -abs(pdisp.y));
         break;
     case EAST:
-        displacement = std::make_pair(abs(pdisp.first), 0);
+        displacement.set(abs(pdisp.x), 0);
         break;
     case SOUTH:
-        displacement = std::make_pair(0, abs(pdisp.second));
+        displacement.set(0, abs(pdisp.y));
         break;
     case WEST:
-        displacement = std::make_pair(-abs(pdisp.first), 0);
+        displacement.set(-abs(pdisp.x), 0);
         break;
     case NORTHEAST:
-        displacement = std::make_pair(abs(pdisp.first), -abs(pdisp.second));
+        displacement.set(abs(pdisp.x), -abs(pdisp.y));
         break;
     case SOUTHEAST:
-        displacement = std::make_pair(abs(pdisp.first), abs(pdisp.second));
+        displacement.set(abs(pdisp.x), abs(pdisp.y));
         break;
     case NORTHWEST:
-        displacement = std::make_pair(-abs(pdisp.first), -abs(pdisp.second));
+        displacement.set(-abs(pdisp.x), -abs(pdisp.y));
         break;
     case SOUTHWEST:
-        displacement = std::make_pair(-abs(pdisp.first), abs(pdisp.second));
+        displacement.set(-abs(pdisp.x), abs(pdisp.y));
         break;
     default:
         MAPNIK_LOG_WARN(text_placements) << "Unknown placement";
diff --git a/src/text_properties.cpp b/src/text_properties.cpp
index 3bacae053..194700048 100644
--- a/src/text_properties.cpp
+++ b/src/text_properties.cpp
@@ -113,9 +113,9 @@ void text_symbolizer_properties::from_xml(xml_node const &sym, fontset_map const
     optional<expression_ptr> orientation_ = sym.get_opt_attr<expression_ptr>("orientation");
     if (orientation_) orientation = *orientation_;
     optional<double> dx = sym.get_opt_attr<double>("dx");
-    if (dx) displacement.first = *dx;
+    if (dx) displacement.x = *dx;
     optional<double> dy = sym.get_opt_attr<double>("dy");
-    if (dy) displacement.second = *dy;
+    if (dy) displacement.y = *dy;
     optional<double> max_char_angle_delta_ = sym.get_opt_attr<double>("max-char-angle-delta");
     if (max_char_angle_delta_) max_char_angle_delta=(*max_char_angle_delta_)*(M_PI/180);
 
@@ -144,13 +144,13 @@ void text_symbolizer_properties::to_xml(boost::property_tree::ptree &node,
         }
     }
 
-    if (displacement.first != dfl.displacement.first || explicit_defaults)
+    if (displacement.x != dfl.displacement.x || explicit_defaults)
     {
-        set_attr(node, "dx", displacement.first);
+        set_attr(node, "dx", displacement.x);
     }
-    if (displacement.second != dfl.displacement.second || explicit_defaults)
+    if (displacement.y != dfl.displacement.y || explicit_defaults)
     {
-        set_attr(node, "dy", displacement.second);
+        set_attr(node, "dy", displacement.y);
     }
     if (label_placement != dfl.label_placement || explicit_defaults)
     {
diff --git a/src/text_symbolizer.cpp b/src/text_symbolizer.cpp
index 0c6a41fd1..ff7982ade 100644
--- a/src/text_symbolizer.cpp
+++ b/src/text_symbolizer.cpp
@@ -350,15 +350,15 @@ label_placement_e  text_symbolizer::get_label_placement() const
 
 void  text_symbolizer::set_displacement(double x, double y)
 {
-    placement_options_->defaults.displacement = std::make_pair(x,y);
+    placement_options_->defaults.displacement.set(x, y);
 }
 
-void text_symbolizer::set_displacement(position const& p)
+void text_symbolizer::set_displacement(const pixel_position &p)
 {
     placement_options_->defaults.displacement = p;
 }
 
-position const& text_symbolizer::get_displacement() const
+pixel_position const& text_symbolizer::get_displacement() const
 {
     return placement_options_->defaults.displacement;
 }