Load GUI from XML

FontProvider.hh

@@ -0,0 +1,42 @@
+#ifndef __OPENGLPLAYGROUND_FONTPROVIDER_HH__
+#define __OPENGLPLAYGROUND_FONTPROVIDER_HH__
+
+#include <memory>
+#include <unordered_map>
+#include <tuple>
+#include <string>
+
+#include "common.hh"
+#include "Singleton.hh"
+
+using FontProviderKeyType = std::tuple<std::string, unsigned>;
+
+namespace std
+{
+  template<>
+  struct hash<FontProviderKeyType> {
+    typedef FontProviderKeyType argument_type;
+    typedef std::size_t result_type;
+ 
+    result_type operator()(argument_type const& s) const {
+      const result_type h1{std::hash<std::string>()(std::get<0>(s))};
+      const result_type h2{std::hash<unsigned>()(std::get<1>(s))};
+      return h1 ^ h2;
+    }
+  };
+}
+
+class FontProvider : public Singleton<FontProvider> {
+private:
+  FontProvider();
+  friend class Singleton<FontProvider>;
+
+public:
+  TTF_Font *getFont(std::string const& name, unsigned ptsize);
+
+  void cleanup();
+  
+private:
+  std::unordered_map<std::tuple<std::string, unsigned>, TTFFontUPtr> fontCache_;
+};
+#endif