Repo created

libs/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