/*

 * 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"

#define C0_9808 0.980785280

#define C0_9239 0.923879532

#define C0_8315 0.831469612

#define C0_7071 0.707106781

#define C0_5556 0.555570233

#define C0_3827 0.382683432

#define C0_1951 0.195090322

/**

 * oil_fdct8x8s_s16:

 * @d_8x8:

 * @ds:

 * @s_8x8:

 * @ss:

 *

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

 * the result in @d_8x8.

 *

 * This function uses an alternate scaling used by RTjpeg.

 */

OIL_DEFINE_CLASS(fdct8x8s_s16,

    "int16_t *d_8x8, int ds, int16_t *s_8x8, int ss");

#if defined(oil_fdct8x8_f64) && defined(oil_conv8x8_s16_f64)

static void

fdct8x8s_s16_ref (int16_t *dest, int dstr, const int16_t *src, int sstr)

{

	double s[64], d[64];

	double scale[8] = {

		4*C0_7071,

		4*C0_9808,

		4*C0_9239,

		4*C0_8315,

		4*C0_7071,

		4*C0_5556,

		4*C0_3827,

		4*C0_1951,

	};

	int i,j;

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

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

			s[8*i+j] = OIL_GET (src,sstr*i+j*sizeof(int16_t), int16_t);

		}

	}

	oil_fdct8x8_f64(d,8*sizeof(double),s,8*sizeof(double));

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

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

			d[8*i+j] *= scale[i] * scale[j];

		}

	}

	oil_conv8x8_s16_f64(dest,dstr,d,8*sizeof(double));

}

OIL_DEFINE_IMPL_REF (fdct8x8s_s16_ref, fdct8x8s_s16);

#endif

#ifdef	__SYMBIAN32__

OilFunctionClass* __oil_function_class_fdct8x8s_s16() {

		return &_oil_function_class_fdct8x8s_s16;

}

#endif

#ifdef	__SYMBIAN32__

OilFunctionImpl* __oil_function_impl_fdct8x8s_s16_ref() {

		return &_oil_function_impl_fdct8x8s_s16_ref;

}

#endif

#ifdef	__SYMBIAN32__

EXPORT_C void** _oil_function_class_ptr_fdct8x8s_s16 ()	{

	oil_function_class_ptr_fdct8x8s_s16 = __oil_function_class_fdct8x8s_s16();

	return &oil_function_class_ptr_fdct8x8s_s16->func;

	}

#endif