WIP: SVG import & rasterization

Updated AntiGrain (agg) library to 2.5
Added agg_svg library from AntiGrain 2.5
added src/slic3r/Utils/SVGImport.cpp/hpp

src/agg_svg/agg_svg_parser.h

@@ -0,0 +1,85 @@
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+//
+// SVG parser.
+//
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SVG_PARSER_INCLUDED
+#define AGG_SVG_PARSER_INCLUDED
+
+#include "agg_svg_path_tokenizer.h"
+#include "agg_svg_path_renderer.h"
+
+namespace agg
+{
+namespace svg
+{
+
+    class parser
+    {
+        enum buf_size_e { buf_size = BUFSIZ };
+    public:
+
+        ~parser();
+        parser(path_renderer& path);
+
+        void parse(const char* fname);
+        const char* title() const { return m_title; }
+
+    private:
+        // XML event handlers
+        static void start_element(void* data, const char* el, const char** attr);
+        static void end_element(void* data, const char* el);
+        static void content(void* data, const char* s, int len);
+
+        void parse_attr(const char** attr);
+        void parse_path(const char** attr);
+        void parse_poly(const char** attr, bool close_flag);
+        void parse_rect(const char** attr);
+        void parse_line(const char** attr);
+        void parse_style(const char* str);
+        void parse_transform(const char* str);
+
+        unsigned parse_matrix(const char* str);
+        unsigned parse_translate(const char* str);
+        unsigned parse_rotate(const char* str);
+        unsigned parse_scale(const char* str);
+        unsigned parse_skew_x(const char* str);
+        unsigned parse_skew_y(const char* str);
+        
+        bool parse_attr(const char* name, const char* value);
+        bool parse_name_value(const char* nv_start, const char* nv_end);
+        void copy_name(const char* start, const char* end);
+        void copy_value(const char* start, const char* end);
+        
+    private:
+        path_renderer& m_path;
+        path_tokenizer m_tokenizer;
+        char*          m_buf;
+        char*          m_title;
+        unsigned       m_title_len;
+        bool           m_title_flag;
+        bool           m_path_flag;
+        char*          m_attr_name;
+        char*          m_attr_value;
+        unsigned       m_attr_name_len;
+        unsigned       m_attr_value_len;
+    };
+
+}
+}
+
+#endif