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/*
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* LIBOIL - Library of Optimized Inner Loops
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* Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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//Portions Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <liboil/liboilfunction.h>
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#include <liboil/liboilfuncs.h>
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#include "liboil/dct/dct.h"
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#define C0_9808 0.980785280
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#define C0_9239 0.923879532
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#define C0_8315 0.831469612
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#define C0_7071 0.707106781
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#define C0_5556 0.555570233
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#define C0_3827 0.382683432
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#define C0_1951 0.195090322
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/**
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* oil_fdct8x8s_s16:
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* @d_8x8:
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* @ds:
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* @s_8x8:
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* @ss:
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*
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* Performs a 2-D Forward Discrete Cosine Transform on @s_8x8 and places
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* the result in @d_8x8.
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*
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* This function uses an alternate scaling used by RTjpeg.
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*/
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OIL_DEFINE_CLASS(fdct8x8s_s16,
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"int16_t *d_8x8, int ds, int16_t *s_8x8, int ss");
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#if defined(oil_fdct8x8_f64) && defined(oil_conv8x8_s16_f64)
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static void
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fdct8x8s_s16_ref (int16_t *dest, int dstr, const int16_t *src, int sstr)
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{
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double s[64], d[64];
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double scale[8] = {
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4*C0_7071,
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4*C0_9808,
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4*C0_9239,
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4*C0_8315,
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4*C0_7071,
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4*C0_5556,
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4*C0_3827,
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4*C0_1951,
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};
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int i,j;
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for(i=0;i<8;i++){
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for(j=0;j<8;j++){
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s[8*i+j] = OIL_GET (src,sstr*i+j*sizeof(int16_t), int16_t);
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}
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}
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oil_fdct8x8_f64(d,8*sizeof(double),s,8*sizeof(double));
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for(i=0;i<8;i++){
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for(j=0;j<8;j++){
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d[8*i+j] *= scale[i] * scale[j];
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}
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}
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oil_conv8x8_s16_f64(dest,dstr,d,8*sizeof(double));
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}
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OIL_DEFINE_IMPL_REF (fdct8x8s_s16_ref, fdct8x8s_s16);
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#endif
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#ifdef __SYMBIAN32__
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OilFunctionClass* __oil_function_class_fdct8x8s_s16() {
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return &_oil_function_class_fdct8x8s_s16;
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}
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#endif
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#ifdef __SYMBIAN32__
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OilFunctionImpl* __oil_function_impl_fdct8x8s_s16_ref() {
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return &_oil_function_impl_fdct8x8s_s16_ref;
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}
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#endif
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#ifdef __SYMBIAN32__
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EXPORT_C void** _oil_function_class_ptr_fdct8x8s_s16 () {
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oil_function_class_ptr_fdct8x8s_s16 = __oil_function_class_fdct8x8s_s16();
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return &oil_function_class_ptr_fdct8x8s_s16->func;
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}
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#endif
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