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#pragma once
#include "render_policy.hpp"
#include "../graphics/overlay.hpp"
#include "../geometry/screenbase.hpp"
#include "../std/shared_ptr.hpp"
class TileRenderer;
class CoverageGenerator;
class QueuedRenderer;
/// This is a base class for a single-threaded and multi-threaded versions of render policies
/// which uses tiles to present a scene.
/// This policies use ScreenCoverage objects to hold all the information, need to render the model
/// at the specified ScreenBase(tiles, texts, symbols, e.t.c)
/// At any moment of time there are a currentCoverage that are drawn in DrawFrame method.
/// There are threads that are responsible for composing new ScreenCoverage from already drawn tiles,
/// and drawing tiles if needed.
/// Once the more recent ScreenCoverage are composed it became a currentCoverage.
class BasicTilingRenderPolicy : public RenderPolicy
{
private:
size_t CalculateTileSize(size_t screenWidth, size_t screenHeight);
protected:
shared_ptr<QueuedRenderer> m_QueuedRenderer;
shared_ptr<TileRenderer> m_TileRenderer;
shared_ptr<CoverageGenerator> m_CoverageGenerator;
ScreenBase m_CurrentScreen;
int m_DrawScale;
bool m_IsEmptyModel;
storage::TIndex m_countryIndex;
bool m_DoRecreateCoverage;
bool m_IsNavigating;
bool m_WasAnimatingLastFrame;
size_t m_TileSize;
protected:
TileRenderer & GetTileRenderer();
void StartNavigation();
void StopNavigation();
void PauseBackgroundRendering();
void ResumeBackgroundRendering();
void CheckAnimationTransition();
public:
BasicTilingRenderPolicy(Params const & p,
bool doUseQueuedRenderer);
void BeginFrame(shared_ptr<PaintEvent> const & ev, ScreenBase const & s);
void DrawFrame(shared_ptr<PaintEvent> const & ev, ScreenBase const & s);
void EndFrame(shared_ptr<PaintEvent> const & ev, ScreenBase const & s);
virtual void StartScale();
virtual void StopScale();
virtual void StartDrag();
virtual void StopDrag();
virtual void StartRotate(double a, double timeInSec);
virtual void StopRotate(double a, double timeInSec);
bool NeedRedraw() const;
bool IsTiling() const;
bool IsEmptyModel() const;
storage::TIndex GetCountryIndex() const;
int GetDrawScale(ScreenBase const & s) const;
size_t ScaleEtalonSize() const;
size_t TileSize() const;
/// benchmarking protocol
int InsertBenchmarkFence();
void JoinBenchmarkFence(int fenceID);
};
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