sl@0: /*
sl@0:  * LIBOIL - Library of Optimized Inner Loops
sl@0:  * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
sl@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
sl@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
sl@0:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
sl@0:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
sl@0:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sl@0:  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
sl@0:  * POSSIBILITY OF SUCH DAMAGE.
sl@0:  */
sl@0: //Portions Copyright (c)  2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 
sl@0: 
sl@0: #ifdef HAVE_CONFIG_H
sl@0: #include "config.h"
sl@0: #endif
sl@0: 
sl@0: #include <liboil/liboilfunction.h>
sl@0: #include "liboil/dct/dct.h"
sl@0: #include <math.h>
sl@0: 
sl@0: /**
sl@0:  * oil_idct8_f64:
sl@0:  * @d_8:
sl@0:  * @dstr:
sl@0:  * @s_8:
sl@0:  * @sstr:
sl@0:  *
sl@0:  * Performs a Inverse Discrete Cosine Transform on @s_8 and places
sl@0:  * the result in @d_8.
sl@0:  */
sl@0: OIL_DEFINE_CLASS (idct8_f64, "double *d_8, int dstr, double *s_8, int sstr");
sl@0: 
sl@0: #define C0_9808 0.980785280
sl@0: #define C0_9239 0.923879532
sl@0: #define C0_8315 0.831469612
sl@0: #define C0_7071 0.707106781
sl@0: #define C0_5556 0.555570233
sl@0: #define C0_3827 0.382683432
sl@0: #define C0_1951 0.195090322
sl@0: 
sl@0: static void idct8_f64_ref(double *dest, int dstr, const double *src, int sstr)
sl@0: {
sl@0: 	static double idct_coeff[8][8];
sl@0: 	static int idct_coeff_init = 0;
sl@0: 	int i,j;
sl@0: 	double x;
sl@0: 
sl@0: 	if(!idct_coeff_init){
sl@0: 		double scale;
sl@0: 
sl@0: 		for(i=0;i<8;i++){
sl@0: 			scale = (i==0) ? sqrt(0.125) : 0.5;
sl@0: 			for(j=0;j<8;j++){
sl@0: 				idct_coeff[j][i] = scale *
sl@0: 					cos((M_PI/8)*i*(j+0.5));
sl@0: 			}
sl@0: 		}
sl@0: 		idct_coeff_init = 1;
sl@0: 	}
sl@0: 
sl@0: 	for(i=0;i<8;i++){
sl@0: 		x = 0;
sl@0: 		for(j=0;j<8;j++){
sl@0: 			x += idct_coeff[i][j] * OIL_GET (src, sstr*j, double);
sl@0: 		}
sl@0: 		OIL_GET (dest, dstr*i, double) = x;
sl@0: 	}
sl@0: }
sl@0: 
sl@0: OIL_DEFINE_IMPL_REF (idct8_f64_ref, idct8_f64);
sl@0: 
sl@0: 
sl@0: static void idct8_f64_fastx(double *dest, int dstr, const double *src, int sstr)
sl@0: {
sl@0: 	double s07, s16, s25, s34;
sl@0: 	double d07, d16, d25, d34;
sl@0: 	double ss07s34, ss16s25;
sl@0: 	double ds07s34, ds16s25;
sl@0: 
sl@0: 	ss07s34 = C0_7071*(OIL_GET(src,sstr*0, double) + OIL_GET(src,sstr*4, double));
sl@0: 	ss16s25 = C0_7071*(OIL_GET(src,sstr*0, double) - OIL_GET(src,sstr*4, double));
sl@0: 
sl@0: 	ds07s34 = C0_9239* OIL_GET(src,sstr*2, double) + C0_3827* OIL_GET(src,sstr*6, double);
sl@0: 	ds16s25 = C0_3827* OIL_GET(src,sstr*2, double) - C0_9239* OIL_GET(src,sstr*6, double);
sl@0: 
sl@0: 	s07 = ss07s34 + ds07s34;
sl@0: 	s34 = ss07s34 - ds07s34;
sl@0: 
sl@0: 	s16 = ss16s25 + ds16s25;
sl@0: 	s25 = ss16s25 - ds16s25;
sl@0: 
sl@0: 	d07 = C0_9808* OIL_GET(src,sstr*1, double) + C0_8315* OIL_GET(src,sstr*3, double)
sl@0: 		+ C0_5556* OIL_GET(src,sstr*5, double) + C0_1951* OIL_GET(src,sstr*7, double);
sl@0: 	d16 = C0_8315* OIL_GET(src,sstr*1, double) - C0_1951* OIL_GET(src,sstr*3, double)
sl@0: 		- C0_9808* OIL_GET(src,sstr*5, double) - C0_5556* OIL_GET(src,sstr*7, double);
sl@0: 	d25 = C0_5556* OIL_GET(src,sstr*1, double) - C0_9808* OIL_GET(src,sstr*3, double)
sl@0: 		+ C0_1951* OIL_GET(src,sstr*5, double) + C0_8315* OIL_GET(src,sstr*7, double);
sl@0: 	d34 = C0_1951* OIL_GET(src,sstr*1, double) - C0_5556* OIL_GET(src,sstr*3, double)
sl@0: 		+ C0_8315* OIL_GET(src,sstr*5, double) - C0_9808* OIL_GET(src,sstr*7, double);
sl@0: 
sl@0: 	OIL_GET(dest,dstr*0, double) = 0.5 * (s07 + d07);
sl@0: 	OIL_GET(dest,dstr*1, double) = 0.5 * (s16 + d16);
sl@0: 	OIL_GET(dest,dstr*2, double) = 0.5 * (s25 + d25);
sl@0: 	OIL_GET(dest,dstr*3, double) = 0.5 * (s34 + d34);
sl@0: 	OIL_GET(dest,dstr*4, double) = 0.5 * (s34 - d34);
sl@0: 	OIL_GET(dest,dstr*5, double) = 0.5 * (s25 - d25);
sl@0: 	OIL_GET(dest,dstr*6, double) = 0.5 * (s16 - d16);
sl@0: 	OIL_GET(dest,dstr*7, double) = 0.5 * (s07 - d07);
sl@0: 
sl@0: }
sl@0: 
sl@0: OIL_DEFINE_IMPL (idct8_f64_fastx, idct8_f64);
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: OilFunctionClass* __oil_function_class_idct8_f64() {
sl@0: 		return &_oil_function_class_idct8_f64;
sl@0: }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: OilFunctionImpl* __oil_function_impl_idct8_f64_ref() {
sl@0: 		return &_oil_function_impl_idct8_f64_ref;
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: OilFunctionImpl* __oil_function_impl_idct8_f64_fastx() {
sl@0: 		return &_oil_function_impl_idct8_f64_fastx;
sl@0: }
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifdef	__SYMBIAN32__
sl@0:  
sl@0: EXPORT_C void** _oil_function_class_ptr_idct8_f64 ()	{
sl@0: 	oil_function_class_ptr_idct8_f64 = __oil_function_class_idct8_f64();
sl@0: 	return &oil_function_class_ptr_idct8_f64->func;
sl@0: 	}
sl@0: #endif
sl@0: