Preallocate memory for glyphs.

include/mapnik/text/layout.hpp

@@ -68,6 +68,8 @@ public:
 
     unsigned get_first_char() const;
     unsigned get_last_char() const;
+
+    unsigned size() const;
 private:
     glyph_vector glyphs_;
     double line_height_; //Includes line spacing (returned by freetype)
@@ -100,6 +102,7 @@ public:
     unsigned size() const;
 
     double cluster_width(unsigned cluster) const;
+    unsigned glyphs_count() const;
 
 private:
     void break_line(text_line_ptr line, double wrap_width, unsigned text_ratio);
@@ -115,6 +118,7 @@ private:
     std::map<unsigned, double> width_map_;
     double width_;
     double height_;
+    unsigned glyphs_count_;
 
 
     //output

include/mapnik/text/placements_list.hpp

@@ -73,17 +73,20 @@ public:
     const_iterator end() const;
 
     void push_back(glyph_info const& glyph, pixel_position offset, rotation const& rot);
+    void reserve(unsigned count);
 
     pixel_position const& get_base_point() const;
     void set_base_point(pixel_position base_point);
     void set_marker(marker_info_ptr marker, pixel_position const& marker_pos);
     marker_info_ptr marker() const;
     pixel_position const& marker_pos() const;
+    box2d<double> const & bbox() const;
 private:
     std::vector<glyph_position> data_;
     pixel_position base_point_;
     marker_info_ptr marker_;
     pixel_position marker_pos_;
+    box2d<double> bbox_;
 };
 typedef boost::shared_ptr<glyph_positions> glyph_positions_ptr;
 

src/text/layout.cpp

@@ -38,7 +38,8 @@
 namespace mapnik
 {
 text_layout::text_layout(face_manager_freetype &font_manager)
-    : font_manager_(font_manager), itemizer_(), width_(0), height_(0), lines_()
+    : font_manager_(font_manager), itemizer_(), width_(0), height_(0), glyphs_count_(0),
+      lines_()
 {
 }
 
@@ -205,6 +206,7 @@ void text_layout::add_line(text_line_ptr line)
     lines_.push_back(line);
     width_ = std::max(width_, line->width());
     height_ += line->height();
+    glyphs_count_ += line->size();
 }
 
 void text_layout::clear()
@@ -248,6 +250,11 @@ double text_layout::cluster_width(unsigned cluster) const
     return 0;
 }
 
+unsigned text_layout::glyphs_count() const
+{
+    return glyphs_count_;
+}
+
 /*********************************************************************************************/
 
 text_line::text_line(unsigned first_char, unsigned last_char)
@@ -311,4 +318,9 @@ unsigned text_line::get_last_char() const
     return last_char_;
 }
 
+unsigned text_line::size() const
+{
+    glyphs_.size();
+}
+
 } //ns mapnik

src/text/placement_finder_ng.cpp

@@ -204,6 +204,7 @@ bool placement_finder_ng::find_point_placement(pixel_position pos)
     // set for upper left corner of text envelope for the first line, top left of first character
     y = layout_.height() / 2.0;
 
+    glyphs->reserve(layout_.glyphs_count());
     text_layout::const_iterator line_itr = layout_.begin(), line_end = layout_.end();
     for (; line_itr != line_end; line_itr++)
     {
@@ -316,6 +317,7 @@ bool placement_finder_ng::single_line_placement(vertex_cache &pp, text_upright_e
     double sign = (real_orientation == UPRIGHT_LEFT) ? -1 : 1;
     double offset = alignment_offset().y + info_->properties.displacement.y + sign * layout_.height()/2.;
 
+    glyphs->reserve(layout_.glyphs_count());
     text_layout::const_iterator line_itr = layout_.begin(), line_end = layout_.end();
     for (; line_itr != line_end; line_itr++)
     {
@@ -496,7 +498,7 @@ box2d<double> placement_finder_ng::get_bbox(glyph_info const& glyph, pixel_posit
 
 
 glyph_positions::glyph_positions()
-    : base_point_()
+    : data_(), base_point_(), marker_(), marker_pos_(), bbox_()
 {
 
 }
@@ -513,10 +515,14 @@ glyph_positions::const_iterator glyph_positions::end() const
 
 void glyph_positions::push_back(const glyph_info &glyph, pixel_position offset, rotation const& rot)
 {
-
     data_.push_back(glyph_position(glyph, offset, rot));
 }
 
+void glyph_positions::reserve(unsigned count)
+{
+    data_.reserve(count);
+}
+
 pixel_position const& glyph_positions::get_base_point() const
 {
     return base_point_;