TextureAtlas.h

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#pragma once
 
#include <string>
#include <cstdint>
#include <optional>
#include <unordered_map>
#include <SFML/Graphics/Rect.hpp>
 
namespace sgui
{
struct Frames {
  Frames () = default;
  uint32_t count = 1;
  sf::IntRect texture = {};
};

class TextureAtlas
{
public:
  TextureAtlas () = default;
  TextureAtlas (const std::string& filename);
  bool loadFromFile (const std::string& filename);
  void add (const std::string& entry, sf::IntRect&& textureRect, const uint32_t framesCount = 1);
  void remove (const std::string& entry);
  void clear ();
  uint32_t texturesCount () const { return mTexturesCount; }
  std::optional <sf::IntRect> textureRect (const std::string& entry, const uint32_t frame = 0) const;
  auto begin () { return std::begin (mAtlas); }
  auto end ()   { return std::end (mAtlas); }
  auto begin () const { return std::cbegin (mAtlas); }
  auto end ()   const { return std::cend (mAtlas); }
private:
  uint32_t mTexturesCount = { 0 };
  sf::Vector2u mTextureDimension = {};
  std::unordered_map <std::string, Frames> mAtlas;
};
 
} // namespace sgui