/*

 * LIBOIL - Library of Optimized Inner Loops

 * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>

 * 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 AUTHOR ``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 AUTHOR 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.

 */

//Portions Copyright (c)  2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <liboil/liboilfunction.h>

#include <liboil/liboilfuncs.h>

#include "liboil/dct/dct.h"

#include <math.h>

/**

 * oil_fdct8x8_f64:

 * @d_8x8:

 * @dstr:

 * @s_8x8:

 * @sstr:

 *

 * Performs a 2-D Forward Discrete Cosine Transform on @s_8x8 and places

 * the result in @d_8x8.

 */

OIL_DEFINE_CLASS(fdct8x8_f64,

    "double *d_8x8, int dstr, double *s_8x8, int sstr");

static void

fdct8x8_f64_ref(double *dest, int dstr, const double *src, int sstr)

{

	static double fdct_coeff[8][8];

	static int fdct_coeff_init = 0;

	int i,j,k,l;

	double tmp1,tmp2;

	if(!fdct_coeff_init){

		double scale;

		for(i=0;i<8;i++){

			scale = (i==0) ? sqrt(0.125) : 0.5;

			for(j=0;j<8;j++){

				fdct_coeff[j][i] = scale *

					cos((M_PI/8)*i*(j+0.5));

			}

		}

		fdct_coeff_init = 1;

	}

	for(i=0;i<8;i++){

		for(j=0;j<8;j++){

			tmp1 = 0;

			for(k=0;k<8;k++){

				tmp2 = 0;

				for(l=0;l<8;l++){

					tmp2 += fdct_coeff[l][j] *

					  OIL_GET (src, sstr*k + l * sizeof(double),

                                              double);

				}

				tmp1 += fdct_coeff[k][i] * tmp2;

			}

			OIL_GET (dest, dstr*i + j*sizeof(double), double) =

                          tmp1;

		}

	}

}

OIL_DEFINE_IMPL_REF (fdct8x8_f64_ref, fdct8x8_f64);

static void

fdct8x8_f64_ref2(double *dest, int dstr, const double *src, int sstr)

{

	static double fdct_coeff[8][8];

	static int fdct_coeff_init = 0;

	int i,j,k;

	double x;

	double tmp[64];

	if(!fdct_coeff_init){

		double scale;

		for(i=0;i<8;i++){

			scale = (i==0) ? sqrt(0.125) : 0.5;

			for(j=0;j<8;j++){

				fdct_coeff[j][i] = scale *

					cos((M_PI/8)*i*(j+0.5));

			}

		}

		fdct_coeff_init = 1;

	}

	for(i=0;i<8;i++){

		for(j=0;j<8;j++){

			x = 0;

			for(k=0;k<8;k++){

				x += fdct_coeff[k][j] *

				  OIL_GET (src, sstr*i + k * sizeof(double), double);

			}

			tmp[8*i+j] = x;

		}

	}

	for(j=0;j<8;j++){

		for(i=0;i<8;i++){

			x = 0;

			for(k=0;k<8;k++){

				x += fdct_coeff[k][i] * tmp[8*k + j];

			}

			OIL_GET (dest,dstr*i+j*sizeof(double), double) = x;

		}

	}

}

OIL_DEFINE_IMPL (fdct8x8_f64_ref2, fdct8x8_f64);

#ifdef oil_fdct8_f64

static void

fdct8x8_f64_1d (double *dest, int dstr, const double *src, int sstr)

{

	int i;

	double tmp[64];

	for(i=0;i<8;i++){

		oil_fdct8_f64(tmp + i*8, OIL_OFFSET(src,sstr*i),

                    sizeof (double), sizeof(double));

	}

	for(i=0;i<8;i++){

		oil_fdct8_f64(dest + i, tmp + i,

                    dstr, 8*sizeof(double));

	}

}

OIL_DEFINE_IMPL (fdct8x8_f64_1d, fdct8x8_f64);

#endif

#ifdef	__SYMBIAN32__

OilFunctionClass* __oil_function_class_fdct8x8_f64() {

		return &_oil_function_class_fdct8x8_f64;

}

#endif

#ifdef	__SYMBIAN32__

OilFunctionImpl* __oil_function_impl_fdct8x8_f64_ref() {

		return &_oil_function_impl_fdct8x8_f64_ref;

}

#endif

#ifdef	__SYMBIAN32__

OilFunctionImpl* __oil_function_impl_fdct8x8_f64_ref2() {

		return &_oil_function_impl_fdct8x8_f64_ref2;

}

#endif

#ifdef	__SYMBIAN32__

OilFunctionImpl* __oil_function_impl_fdct8x8_f64_1d() {

		return &_oil_function_impl_fdct8x8_f64_1d;

}

#endif

#ifdef	__SYMBIAN32__

EXPORT_C void** _oil_function_class_ptr_fdct8x8_f64 ()	{

	oil_function_class_ptr_fdct8x8_f64 = __oil_function_class_fdct8x8_f64();

	return &oil_function_class_ptr_fdct8x8_f64->func;

	}

#endif