268 lines
6.6 KiB
C
268 lines
6.6 KiB
C
/** Find the absolute value of an image.
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* Acts as a copy for UNSIGNED types, negate
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* for int types, fabs() for float types, and calculate modulus for
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* complex types.
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*\file im_abs.c
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*
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* Copyright: 1990, N. Dessipris, based on im_powtra()
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* Author: Nicos Dessipris
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* Written on: 02/05/1990
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* Modified on:
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* 5/5/93 J.Cupitt
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* - adapted from im_lintra to work with partial images
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* - complex and signed support added
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* 30/6/93 JC
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* - adapted for partial v2
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* - ANSI conversion
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* - spe29873r6k3h()**!@lling errors removed
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* 9/2/95 JC
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* - adapted for im_wrap...
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* 20/6/02 JC
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* - tiny speed up
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* 8/12/06
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* - add liboil support
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <assert.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#ifdef HAVE_LIBOIL
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#include <liboil/liboil.h>
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#endif /*HAVE_LIBOIL*/
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Integer abs operation: just test and negate.
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*/
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#define intabs(TYPE) \
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{ \
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TYPE *p = (TYPE *) in; \
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TYPE *q = (TYPE *) out; \
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int x; \
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\
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for( x = 0; x < sz; x++ ) { \
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TYPE v = p[x]; \
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\
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if( v < 0 ) \
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q[x] = 0 - v; \
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else \
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q[x] = v; \
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} \
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}
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/* Float abs operation: call fabs().
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*/
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#define floatabs(TYPE)\
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{\
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TYPE *p = (TYPE *) in;\
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TYPE *q = (TYPE *) out;\
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int x; \
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\
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for( x = 0; x < sz; x++ )\
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q[x] = fabs( p[x] );\
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}
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/* Complex abs operation: calculate modulus.
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*/
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#ifdef HAVE_HYPOT
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#define complexabs(TYPE) { \
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TYPE *p = (TYPE *) in; \
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TYPE *q = (TYPE *) out; \
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int i; \
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\
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for( i = 0; i < sz; i++ ) { \
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q[i] = hypot( p[0], p[1] ); \
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p += 2; \
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} \
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}
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#else /*HAVE_HYPOT*/
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#define complexabs(TYPE) { \
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TYPE *p = (TYPE *) in; \
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TYPE *q = (TYPE *) out; \
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TYPE *q_stop = q + sz; \
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\
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while( q < q_stop ){ \
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double rp = *p++; \
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double ip = *p++; \
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double abs_rp= fabs( rp ); \
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double abs_ip= fabs( ip ); \
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\
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if( abs_rp > abs_ip ){ \
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double temp= ip / rp; \
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*q++= abs_rp * sqrt( 1.0 + temp * temp ); \
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} \
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else { \
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double temp= rp / ip; \
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*q++= abs_ip * sqrt( 1.0 + temp * temp ); \
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} \
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} \
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}
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#endif /*HAVE_HYPOT*/
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/* Abs a buffer of PELs.
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*/
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static void
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abs_gen( PEL *in, PEL *out, int width, IMAGE *im )
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{
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int sz = width * im->Bands;
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/* Abs all input types.
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*/
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switch( im->BandFmt ) {
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case IM_BANDFMT_CHAR:
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#ifdef HAVE_LIBOIL
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oil_abs_u8_s8( (uint8_t *) out, sizeof( uint8_t ),
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(int8_t *) in, sizeof( int8_t ), sz );
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#else /*!HAVE_LIBOIL*/
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intabs( signed char );
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#endif /*HAVE_LIBOIL*/
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break;
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case IM_BANDFMT_SHORT:
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#ifdef HAVE_LIBOIL
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oil_abs_u16_s16( (uint16_t *) out, sizeof( uint16_t ),
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(int16_t *) in, sizeof( int16_t ), sz );
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#else /*!HAVE_LIBOIL*/
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intabs( signed short );
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#endif /*HAVE_LIBOIL*/
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break;
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case IM_BANDFMT_INT:
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#ifdef HAVE_LIBOIL
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oil_abs_u32_s32( (uint32_t *) out, sizeof( uint32_t ),
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(int32_t *) in, sizeof( int32_t ), sz );
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#else /*!HAVE_LIBOIL*/
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intabs( signed int );
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#endif /*HAVE_LIBOIL*/
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break;
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case IM_BANDFMT_FLOAT:
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#ifdef HAVE_LIBOIL
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oil_abs_f32_f32( (float *) out, sizeof( float ),
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(float *) in, sizeof( float ), sz );
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#else /*!HAVE_LIBOIL*/
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floatabs( float );
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#endif /*HAVE_LIBOIL*/
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break;
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case IM_BANDFMT_DOUBLE:
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#ifdef HAVE_LIBOIL
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oil_abs_f64_f64( (double *) out, sizeof( double ),
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(double *) in, sizeof( double ), sz );
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#else /*!HAVE_LIBOIL*/
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floatabs( float );
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#endif /*HAVE_LIBOIL*/
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break;
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case IM_BANDFMT_COMPLEX: complexabs( float ); break;
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case IM_BANDFMT_DPCOMPLEX: complexabs( double ); break;
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default:
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assert( 0 );
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}
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}
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/** Abs of image.
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*@param in is input IMAGE
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*@param out is output IMAGE
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*@return 0 on success, -1 on failure
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*@see IMAGE
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*/
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int
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im_abs( IMAGE *in, IMAGE *out )
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{
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/* Check args.
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*/
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if( in->Coding != IM_CODING_NONE ) {
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im_error( "im_abs", "%s", _( "not uncoded" ) );
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return( -1 );
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}
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/* Is this one of the unsigned types? Degenerate to im_copy() if it
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* is.
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*/
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if( im_isuint( in ) )
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return( im_copy( in, out ) );
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/* Prepare output header. Output type == input type, except for
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* complex.
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*/
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if( im_cp_desc( out, in ) )
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return( -1 );
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switch( in->BandFmt ) {
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case IM_BANDFMT_CHAR:
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case IM_BANDFMT_SHORT:
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case IM_BANDFMT_INT:
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case IM_BANDFMT_FLOAT:
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case IM_BANDFMT_DOUBLE:
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/* No action.
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*/
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break;
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case IM_BANDFMT_COMPLEX:
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out->Bbits = IM_BBITS_FLOAT;
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out->BandFmt = IM_BANDFMT_FLOAT;
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break;
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case IM_BANDFMT_DPCOMPLEX:
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out->Bbits = IM_BBITS_DOUBLE;
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out->BandFmt = IM_BANDFMT_DOUBLE;
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break;
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default:
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im_error( "im_abs", "%s", _( "unknown input type" ) );
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return( -1 );
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}
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/* Generate!
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*/
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if( im_wrapone( in, out,
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(im_wrapone_fn) abs_gen, in, NULL ) )
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return( -1 );
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return( 0 );
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}
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