#ifndef WARP_H
#define WARP_H

#include "tfxparam.h"
#include "trop.h"
#include "trasterfx.h"

//-----------------------------------------------------------------------

struct WarpParams {
	int m_shrink;
	double m_warperScale;
	double m_intensity;
	bool m_sharpen;
};

struct LPoint {
	TPointD s; // Warped lattice point
	TPointD d; // Original lattice point
};

struct Lattice {
	int m_width;	//Number of lattice columns
	int m_height;   //Number of lattice rows
	LPoint *coords; //Grid vertex coordinates

	Lattice() : coords(0) {}
	~Lattice()
	{
		if (coords)
			delete[] coords;
	}
};

namespace //Ugly...
{
inline int myCeil(double x)
{
	return ((x - (int)(x)) > TConsts::epsilon ? (int)(x) + 1 : (int)(x));
}

inline TRect convert(const TRectD &r, TPointD &dp)
{

	TRect ri(tfloor(r.x0), tfloor(r.y0), myCeil(r.x1), myCeil(r.y1));
	dp.x = r.x0 - ri.x0;
	dp.y = r.y0 - ri.y0;
	assert(dp.x >= 0 && dp.y >= 0);
	return ri;
}
}

//---------------------------------------------------------------------------

inline double getWarpRadius(const WarpParams &params)
{
	return 2.55 * 1.5 * 1.5 * fabs(params.m_intensity);
}

//---------------------------------------------------------------------------

inline double getWarperEnlargement(const WarpParams &params)
{
	//It accounts for:
	//  * Resample factor (1 - due to triangle filtering)
	//  * Eventual grid smoothening (6 - as the blur radius applied after resampling)
	//  * grid interpolation (2 - for the shepard interpolant radius)
	int enlargement = 3;
	if (!params.m_sharpen)
		enlargement += 6;
	return enlargement;
}

//---------------------------------------------------------------------------

void getWarpComputeRects(
	TRectD &outputComputeRect,
	TRectD &warpedComputeRect,
	const TRectD &warpedBox,
	const TRectD &requestedRect,
	const WarpParams &params);

//---------------------------------------------------------------------------

//!Deals with raster tiles and invokes warper functions
void warp(TRasterP &tileRas, const TRasterP &rasIn, TRasterP &warper,
		  TPointD rasInPos, TPointD warperPos, const WarpParams &params);

#endif