Implement Font constructor from TTF_Font*

Author: AMDmi3

SDL2pp/Font.cc

@@ -1,6 +1,6 @@
 /*
   libSDL2pp - C++11 bindings/wrapper for SDL2
-  Copyright (C) 2014 Dmitry Marakasov <amdmi3@amdmi3.ru>
+  Copyright (C) 2014-2015 Dmitry Marakasov <amdmi3@amdmi3.ru>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -27,6 +27,10 @@
 
 namespace SDL2pp {
 
+Font::Font(TTF_Font* font) {
+	font_ = font;
+}
+
 Font::Font(const std::string& file, int ptsize, long index) {
 	if ((font_ = TTF_OpenFontIndex(file.c_str(), ptsize, index)) == nullptr)
 		throw Exception("TTF_OpenFontIndex failed");

SDL2pp/Font.hh

@@ -49,6 +49,14 @@ private:
 	TTF_Font* font_; ///< Managed TTF_Font object
 
 public:
+	////////////////////////////////////////////////////////////
+	/// \brief Construct from existing TTF_Font structure
+	///
+	/// \param font Existing TTF_Font to manage
+	///
+	////////////////////////////////////////////////////////////
+	Font(TTF_Font* font);
+
 	////////////////////////////////////////////////////////////
 	/// \brief Loads font from .ttf or .fon file
 	///