DtGLFontManager.h

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/******************************************************************************
** Copyright (c) 2023 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvGraphics/vrvGraphics.h>

#include <vrvCore/DtFontManagerInterface.h>

#include <vector>
#include <unordered_map>

namespace makVrv
{
   class DtFont;

   class DT_DLL_VRVGRAPHICS DtGLFontManager : public DtFontManagerInterface
   {
   public:
      DtGLFontManager(DtDe& de, const std::string& fontPath);

      ~DtGLFontManager();

      DtGLFontManager() = delete;
      DtGLFontManager(const DtGLFontManager& rhs) = delete;
      DtGLFontManager& operator=(const DtGLFontManager& rhs) = delete;

   public:
      virtual DtFontInterface* getFont(const std::string& filename, float size) override;

      //Deletes all fonts in memory.
      virtual void clear() override;

      virtual void addTextureListForDeletion(const std::vector<unsigned int>& textures ) override;

      virtual void releaseResouces();

      virtual void flushTextureList();

   protected:
      virtual DtFontInterface* getDefaultFont(float size);

   protected:
      struct FontKey
      {
         std::string myFontFileName;
         float myFontSize = 0;

         bool operator==(const FontKey& rhs) const;
      };

      struct FontKeyHasher
      {
         std::size_t operator()(const FontKey& k) const;
      };

      std::unordered_map< FontKey, DtFont*, FontKeyHasher > myMap;

      std::vector<unsigned int> myTextures;

      DtDe& myDe;

      bool myDefaultFontExists = false;
      std::string myDefaultFontFile;
   };
}