use the std library tolower over boost::algorithm::to_lower for both better runtime and compile speed - closes #1677

include/mapnik/boolean.hpp

@@ -24,9 +24,8 @@
 
 // std
 #include <istream>
-
-// boost
-#include <boost/algorithm/string.hpp>
+#include <algorithm>
+#include <string>
 
 namespace mapnik
 {
@@ -65,7 +64,7 @@ operator >> ( std::basic_istream<charT, traits> & s, boolean & b )
 {
     std::string word;
     s >> word;
-    boost::algorithm::to_lower(word);
+    std::transform(word.begin(), word.end(), word.begin(), ::tolower);
     if ( s )
     {
         if ( word == "true" || word == "yes" || word == "on" ||

plugins/input/csv/csv_datasource.cpp

@@ -30,6 +30,7 @@
 
 // mapnik
 #include <mapnik/debug.hpp>
+#include <mapnik/unicode.hpp>
 #include <mapnik/feature_layer_desc.hpp>
 #include <mapnik/feature_factory.hpp>
 #include <mapnik/geometry.hpp>
@@ -47,6 +48,7 @@
 #include <iostream>
 #include <vector>
 #include <string>
+#include <algorithm>
 
 using mapnik::datasource;
 using mapnik::parameters;
@@ -267,7 +269,8 @@ void csv_datasource::parse_csv(T & stream,
         for (; beg != tok.end(); ++beg)
         {
             std::string val = mapnik::util::trim_copy(*beg);
-            std::string lower_val = boost::algorithm::to_lower_copy(val);
+            std::string lower_val = val;
+            std::transform(lower_val.begin(), lower_val.end(), lower_val.begin(), ::tolower);
             if (lower_val == "wkt"
                 || (lower_val.find("geom") != std::string::npos))
             {
@@ -345,7 +348,8 @@ void csv_datasource::parse_csv(T & stream,
                         }
                         else
                         {
-                            std::string lower_val = boost::algorithm::to_lower_copy(val);
+                            std::string lower_val = val;
+                            std::transform(lower_val.begin(), lower_val.end(), lower_val.begin(), ::tolower);
                             if (lower_val == "wkt"
                                 || (lower_val.find("geom") != std::string::npos))
                             {

plugins/input/sqlite/sqlite_utils.hpp

@@ -26,6 +26,7 @@
 // stl
 #include <string>
 #include <vector>
+#include <algorithm>
 
 // mapnik
 #include <mapnik/datasource.hpp>
@@ -642,7 +643,7 @@ public:
             const char* fld_name = rs->column_text(1);
             std::string fld_type(rs->column_text(2));
             sqlite_int64 fld_pk = rs->column_integer64(5);
-            boost::algorithm::to_lower(fld_type);
+            std::transform(fld_type.begin(), fld_type.end(), fld_type.begin(), ::tolower);
 
             // TODO - how to handle primary keys on multiple columns ?
             if (key_field.empty() && ! found_pk && fld_pk != 0)

src/font_engine_freetype.cpp

@@ -32,7 +32,10 @@
 #include <boost/algorithm/string.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/make_shared.hpp>
+
+// stl
 #include <sstream>
+#include <algorithm>
 
 // icu
 #include <unicode/ubidi.h>
@@ -59,7 +62,8 @@ freetype_engine::~freetype_engine()
 bool freetype_engine::is_font_file(std::string const& file_name)
 {
     /** only accept files that will be matched by freetype2's `figurefiletype()` */
-    std::string const& fn = boost::algorithm::to_lower_copy(file_name);
+    std::string fn = file_name;
+    std::transform(fn.begin(), fn.end(), fn.begin(), ::tolower);
     return boost::algorithm::ends_with(fn,std::string(".ttf")) ||
         boost::algorithm::ends_with(fn,std::string(".otf")) ||
         boost::algorithm::ends_with(fn,std::string(".ttc")) ||

src/image_util.cpp

@@ -55,6 +55,7 @@ extern "C"
 #include <iostream>
 #include <fstream>
 #include <sstream>
+#include <algorithm>
 
 namespace mapnik
 {
@@ -225,8 +226,8 @@ void save_to_stream(T const& image,
 {
     if (stream && image.width() > 0 && image.height() > 0)
     {
-        //all this should go into image_writer factory
-        std::string t = boost::algorithm::to_lower_copy(type);
+        std::string t = type;
+        std::transform(t.begin(), t.end(), t.begin(), ::tolower);
         if (t == "png" || boost::algorithm::starts_with(t, "png"))
         {
             int colors  = 256;
@@ -286,8 +287,8 @@ void save_to_stream(T const& image,
 {
     if (stream && image.width() > 0 && image.height() > 0)
     {
-        //all this should go into image_writer factory
-        std::string t = boost::algorithm::to_lower_copy(type);
+        std::string t = type;
+        std::transform(t.begin(), t.end(), t.begin(), ::tolower);
         if (t == "png" || boost::algorithm::starts_with(t, "png"))
         {
             int colors  = 256;