/*
 * Copyright 2011, Blender Foundation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributor: 
 *		Jeroen Bakker 
 *		Monique Dewanchand
 */

#ifndef _COM_ScreenLensDistortionOperation_h
#define _COM_ScreenLensDistortionOperation_h
#include "COM_NodeOperation.h"
#include "DNA_node_types.h"

class ScreenLensDistortionOperation : public NodeOperation {
private:
	/**
	 * Cached reference to the inputProgram
	 */
	SocketReader *m_inputProgram;
	
	bool m_fit;
	bool m_jitter;
	
	float m_dispersion;
	float m_distortion;
	bool m_dispersion_const;
	bool m_distortion_const;
	bool m_variables_ready;
	float m_k[3];
	float m_k4[3];
	float m_dk4[3];
	float m_maxk;
	float m_sc, m_cx, m_cy;
public:
	ScreenLensDistortionOperation();
	
	/**
	 * the inner loop of this program
	 */
	void executePixel(float output[4], int x, int y, void *data);
	
	/**
	 * Initialize the execution
	 */
	void initExecution();
	
	void *initializeTileData(rcti *rect);
	/**
	 * Deinitialize the execution
	 */
	void deinitExecution();
	
	void setFit(bool fit) { m_fit = fit; }
	void setJitter(bool jitter) { m_jitter = jitter; }
	
	/** Set constant distortion value */
	void setDistortion(float distortion);
	/** Set constant dispersion value */
	void setDispersion(float dispersion);
	
	bool determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output);

private:
	void determineUV(float result[6], float x, float y) const;
	void updateVariables(float distortion, float dispersion);

	void get_uv(const float xy[2], float uv[2]) const;
	void distort_uv(const float uv[2], float t, float xy[2]) const;
	bool get_delta(float r_sq, float k4, const float uv[2], float delta[2]) const;
	void accumulate(MemoryBuffer *buffer, int a, int b,
	                float r_sq, const float uv[2], const float delta[3][2],
	                float sum[4], int count[3]) const;
};
#endif
