resolution.hpp

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#ifndef ESP32CAM_RESOLUTION_HPP
#define ESP32CAM_RESOLUTION_HPP
 
#include <Printable.h>
#include <iterator>
 
namespace esp32cam {
 
class ResolutionList;
 
class Resolution : public Printable {
public:
  static ResolutionList list();
 
  static Resolution find(int minWidth, int minHeight);
 
  explicit Resolution(int frameSize = -1);
 
  bool isValid() const;
 
  int getWidth() const;
 
  int getHeight() const;
 
  size_t printTo(Print& p) const override;
 
  template<typename T>
  T as() const {
    return static_cast<T>(m_frameSize);
  }
 
private:
  int m_frameSize; 
 
  friend bool operator==(const Resolution& lhs, const Resolution& rhs) {
    return (!lhs.isValid() && !rhs.isValid()) || (lhs.m_frameSize == rhs.m_frameSize);
  }
 
  friend bool operator!=(const Resolution& lhs, const Resolution& rhs) {
    return !(lhs == rhs);
  }
 
  friend bool operator<(const Resolution& lhs, const Resolution& rhs) {
    return lhs.m_frameSize < rhs.m_frameSize;
  }
 
  friend bool operator>(const Resolution& lhs, const Resolution& rhs) {
    return lhs.m_frameSize > rhs.m_frameSize;
  }
};
 
class ResolutionList {
public:
  class Iterator {
  public:
    using iterator_catagory = std::forward_iterator_tag;
    using value_type = const Resolution;
    using difference_type = std::ptrdiff_t;
    using pointer = void;
    using reference = value_type;
 
    explicit Iterator(int value = -1)
      : m_frameSize(value) {}
 
    Iterator& operator++() {
      ++m_frameSize;
      return *this;
    }
 
    Iterator operator++(int) {
      Iterator copy(*this);
      ++*this;
      return copy;
    }
 
    reference operator*() {
      return Resolution(m_frameSize);
    }
 
  private:
    int m_frameSize; 
 
    friend bool operator==(const Iterator& lhs, const Iterator& rhs) {
      return lhs.m_frameSize == rhs.m_frameSize;
    }
 
    friend bool operator!=(const Iterator& lhs, const Iterator& rhs) {
      return !(lhs == rhs);
    }
  };
 
  explicit ResolutionList(int max = 0);
 
  Iterator begin() const;
 
  Iterator end() const;
 
  Resolution find(int minWidth, int minHeight) const;
 
private:
  int m_max;
};
 
} // namespace esp32cam
 
#endif // ESP32CAM_RESOLUTION_HPP