#pragma once

#include "geometry/point2d.hpp"

namespace df
{

// Pixel ratio independent viewport implementation
// pixelRatio is ratio between physical pixels and device-independent
// pixels for the window. On retina displays pixelRation equal 2.0, In common equal 1.0
class Viewport
{
public:
  // x0, y0, w, h is device-independent pixels
  Viewport(uint32_t x0, uint32_t y0,
           uint32_t w, uint32_t h);

  ///@{ in surface pixels
  /// on iOS we must mul this on scaleFactor
  /// on android we get true size from surface
  void SetViewport(uint32_t x0, uint32_t y0, uint32_t w, uint32_t h);

  uint32_t GetX0() const;
  uint32_t GetY0() const;
  uint32_t GetWidth() const;
  uint32_t GetHeight() const;
  ///@}
  // Apply viewport to graphics pipeline
  // with convert start poin and size to physical pixels
  void Apply() const;

private:
  m2::PointU m_zero;
  m2::PointU m_size;
};

} // namespace df