drape/viewport.hpp


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#pragma once

#include "drape/graphics_context.hpp"

#include "geometry/point2d.hpp"

namespace dp
{
// Pixel ratio independent viewport implementation.
// pixelRatio is ratio between physical pixels and device-independent pixels for the window.
class Viewport
{
public:
  // x0, y0, w, h is device-independent pixels
  Viewport(uint32_t x0, uint32_t y0, uint32_t w, uint32_t h);

  // On iOS we must multiply 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 point and size to physical pixels.
  void Apply(ref_ptr<dp::GraphicsContext> context) const;

private:
  m2::PointU m_zero;
  m2::PointU m_size;
};
}  // namespace dp