/*
 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2007, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "mct.h"
#include "fix.h"
#include "opj_malloc.h"

/* <summary> */
/* This table contains the norms of the basis function of the reversible MCT. */
/* </summary> */
static const OPJ_FLOAT64 mct_norms[3] = { 1.732, .8292, .8292 };

/* <summary> */
/* This table contains the norms of the basis function of the irreversible MCT. */
/* </summary> */
static const OPJ_FLOAT64 mct_norms_real[3] = { 1.732, 1.805, 1.573 };



const OPJ_FLOAT64 * get_mct_norms ()
{
	return mct_norms;
}

const OPJ_FLOAT64 * get_mct_norms_real ()
{
	return mct_norms_real;
}



/* <summary> */
/* Foward reversible MCT. */
/* </summary> */
void mct_encode(
		OPJ_INT32* restrict c0,
		OPJ_INT32* restrict c1,
		OPJ_INT32* restrict c2,
		OPJ_UINT32 n)
{
	OPJ_UINT32 i;
	for(i = 0; i < n; ++i) {
		OPJ_INT32 r = c0[i];
		OPJ_INT32 g = c1[i];
		OPJ_INT32 b = c2[i];
		OPJ_INT32 y = (r + (g * 2) + b) >> 2;
		OPJ_INT32 u = b - g;
		OPJ_INT32 v = r - g;
		c0[i] = y;
		c1[i] = u;
		c2[i] = v;
	}
}

/* <summary> */
/* Inverse reversible MCT. */
/* </summary> */
void mct_decode(
		OPJ_INT32* restrict c0,
		OPJ_INT32* restrict c1, 
		OPJ_INT32* restrict c2, 
		OPJ_UINT32 n)
{
	OPJ_UINT32 i;
	for (i = 0; i < n; ++i) {
		OPJ_INT32 y = c0[i];
		OPJ_INT32 u = c1[i];
		OPJ_INT32 v = c2[i];
		OPJ_INT32 g = y - ((u + v) >> 2);
		OPJ_INT32 r = v + g;
		OPJ_INT32 b = u + g;
		c0[i] = r;
		c1[i] = g;
		c2[i] = b;
	}
}

/* <summary> */
/* Get norm of basis function of reversible MCT. */
/* </summary> */
OPJ_FLOAT64 mct_getnorm(OPJ_UINT32 compno) {
	return mct_norms[compno];
}

/* <summary> */
/* Foward irreversible MCT. */
/* </summary> */
void mct_encode_real(
		OPJ_INT32* restrict c0,
		OPJ_INT32* restrict c1,
		OPJ_INT32* restrict c2,
		OPJ_UINT32 n)
{
	OPJ_UINT32 i;
	for(i = 0; i < n; ++i) {
		OPJ_INT32 r = c0[i];
		OPJ_INT32 g = c1[i];
		OPJ_INT32 b = c2[i];
		OPJ_INT32 y =  fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
		OPJ_INT32 u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
		OPJ_INT32 v =  fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
		c0[i] = y;
		c1[i] = u;
		c2[i] = v;
	}
}

/* <summary> */
/* Inverse irreversible MCT. */
/* </summary> */
void mct_decode_real(
		OPJ_FLOAT32* restrict c0,
		OPJ_FLOAT32* restrict c1,
		OPJ_FLOAT32* restrict c2,
		OPJ_UINT32 n)
{
	OPJ_UINT32 i;
	for(i = 0; i < n; ++i) {
		OPJ_FLOAT32 y = c0[i];
		OPJ_FLOAT32 u = c1[i];
		OPJ_FLOAT32 v = c2[i];
		OPJ_FLOAT32 r = y + (v * 1.402f);
		OPJ_FLOAT32 g = y - (u * 0.34413f) - (v * (0.71414f));
		OPJ_FLOAT32 b = y + (u * 1.772f);
		c0[i] = r;
		c1[i] = g;
		c2[i] = b;
	}
}

/* <summary> */
/* Get norm of basis function of irreversible MCT. */
/* </summary> */
OPJ_FLOAT64 mct_getnorm_real(OPJ_UINT32 compno) {
	return mct_norms_real[compno];
}

bool mct_encode_custom(
					   // MCT data
					   OPJ_BYTE * pCodingdata, 
					   // size of components
					   OPJ_UINT32 n, 
					   // components
					   OPJ_BYTE ** pData, 
					   // nb of components (i.e. size of pData)
					   OPJ_UINT32 pNbComp, 
					   // tells if the data is signed
					   OPJ_UINT32 isSigned)
{
	OPJ_FLOAT32 * lMct = (OPJ_FLOAT32 *) pCodingdata;
	OPJ_UINT32 i;
	OPJ_UINT32 j;
	OPJ_UINT32 k;
	OPJ_UINT32 lNbMatCoeff = pNbComp * pNbComp;
	OPJ_INT32 * lCurrentData = 00;
	OPJ_INT32 * lCurrentMatrix = 00;
	OPJ_INT32 ** lData = (OPJ_INT32 **) pData;
	OPJ_UINT32 lMultiplicator = 1 << 13;
	OPJ_INT32 * lMctPtr;
	
	lCurrentData = (OPJ_INT32 *) opj_malloc((pNbComp + lNbMatCoeff) * sizeof(OPJ_INT32));
	if
		(! lCurrentData)
	{
		return false;
	}
	lCurrentMatrix = lCurrentData + pNbComp;
	for
		(i =0;i<lNbMatCoeff;++i)
	{
		lCurrentMatrix[i] = (OPJ_INT32) (*(lMct++) * lMultiplicator);
	}
	for
		(i = 0; i < n; ++i) 
	{
		lMctPtr = lCurrentMatrix;
		for
			(j=0;j<pNbComp;++j)
		{
			lCurrentData[j] = (*(lData[j]));
		}
		for
			(j=0;j<pNbComp;++j)
		{
			*(lData[j]) = 0;
			for
				(k=0;k<pNbComp;++k)
			{
				*(lData[j]) += fix_mul(*lMctPtr, lCurrentData[k]);
				++lMctPtr;
			}
			++lData[j];
		}
	}
	opj_free(lCurrentData);
	return true;
}

bool mct_decode_custom(
					   // MCT data
					   OPJ_BYTE * pDecodingData, 
					   // size of components
					   OPJ_UINT32 n,
					   // components
					   OPJ_BYTE ** pData, 
					   // nb of components (i.e. size of pData)
					   OPJ_UINT32 pNbComp, 
					   // tells if the data is signed
					   OPJ_UINT32 isSigned)
{
	OPJ_FLOAT32 * lMct;
	OPJ_UINT32 i;
	OPJ_UINT32 j;
	OPJ_UINT32 k;
	
	OPJ_FLOAT32 * lCurrentData = 00;
	OPJ_FLOAT32 * lCurrentResult = 00;
	OPJ_FLOAT32 ** lData = (OPJ_FLOAT32 **) pData;

	lCurrentData = (OPJ_FLOAT32 *) opj_malloc (2 * pNbComp * sizeof(OPJ_FLOAT32));
	if
		(! lCurrentData)
	{
		return false;
	}
	lCurrentResult = lCurrentData + pNbComp;

	for
		(i = 0; i < n; ++i) 
	{
		lMct = (OPJ_FLOAT32 *) pDecodingData;
		for
			(j=0;j<pNbComp;++j)
		{
			lCurrentData[j] = (OPJ_FLOAT32) (*(lData[j]));
		}
		for
			(j=0;j<pNbComp;++j)
		{
			lCurrentResult[j] = 0;
			for
				(k=0;k<pNbComp;++k)
			{
				lCurrentResult[j] += *(lMct++) * lCurrentData[k];
			}
			*(lData[j]++) = (OPJ_FLOAT32) (lCurrentResult[j]);
		}
	}
	opj_free(lCurrentData);
	return true;
}

void opj_calculate_norms(OPJ_FLOAT64 * pNorms,OPJ_UINT32 pNbComps,OPJ_FLOAT32 * pMatrix)
{
	OPJ_UINT32 i,j,lIndex;
	OPJ_FLOAT32 lCurrentValue;
	OPJ_FLOAT64 * lNorms = (OPJ_FLOAT64 *) pNorms;
	OPJ_FLOAT32 * lMatrix = (OPJ_FLOAT32 *) pMatrix;

	for
		(i=0;i<pNbComps;++i)
	{
		lNorms[i] = 0;
		lIndex = i;
		for
			(j=0;j<pNbComps;++j)
		{
			lCurrentValue = lMatrix[lIndex];
			lIndex += pNbComps;
			lNorms[i] += lCurrentValue * lCurrentValue;
		}
		lNorms[i] = sqrt(lNorms[i]);
	}
}