#ifndef _PERSPECTIVEWARP_HPP_
#define _PERSPECTIVEWARP_HPP_
#include <mdiwin/main.hpp>

class PerspectiveWarp
{
public:
	enum Type{Incremental,None};
	enum Operation{Add,Subtract,Multiply,Divide};
	PerspectiveWarp(WORD width,WORD height,UHUGE *hpImageInvert,
		double wRow,double wCol);
	PerspectiveWarp(WORD width,WORD height,
		double wRow,double wCol,
		Operation colOp,double colIncr,
		Operation rowOp,double rowIncr,UHUGE *hpImageInvert);
	~PerspectiveWarp();
	HGLOBAL performPerspectiveWarp(void);
	void cancelThread(void);
	WORD isCancelled(void)const;
private:
	HGLOBAL incrementalWarp(void);
	HGLOBAL nonIncrementalWarp(void);
	WORD yieldTask(void)const;
	WORD emergencyCleanup(HGLOBAL hGlobalSource,HGLOBAL hGlobal)const;

  double mwRow, mwCol;
	double mRowIncr, mColIncr;
	Operation mRowOp, mColOp;
	WORD mWidth, mHeight;
	WORD mIsInThread;
	Type mWarpType;
	UHUGE *mhpImageInvert;
};

inline
void PerspectiveWarp::cancelThread(void)
{
	mIsInThread=FALSE;
}

inline
WORD PerspectiveWarp::isCancelled(void)const
{
	return !mIsInThread;
}
#endif