308 lines
7.8 KiB
C
308 lines
7.8 KiB
C
/* power.c --- various power functions
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*
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* Copyright: 1990, N. Dessipris
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*
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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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* 10/12/93 JC
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* - now reports total number of x/0, rather than each one.
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* 1/2/95 JC
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* - rewritten for PIO with im_wrapone()
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* - incorrect complex code removed
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* - /0 reporting removed for ease of programming
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* 15/4/97 JC
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* - return( 0 ) missing, oops!
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* 6/7/98 JC
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* - _vec form added
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* 30/8/09
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* - gtkdoc
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* - tiny cleanups
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* 20/9/09
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* - im_powtra() adapated to make power.c
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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 <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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/* Operator with a single constant.
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*/
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#define CONST1( IN, OUT, FUN ) { \
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OUT *tq = (OUT *) q; \
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IN *tp = (IN *) p; \
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\
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for( i = 0; i < ne; i++ ) \
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FUN( tq[i], tp[i], c ); \
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}
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/* Operator with a single constant on a buffer.
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*/
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#define CONST1_BUFFER( FUN ) \
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static void \
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FUN ## 1_buffer( PEL *p, PEL *q, int n, double *tc, IMAGE *im ) \
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{ \
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/* Complex just doubles the size. \
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*/ \
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const int ne = n * im->Bands * \
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(vips_bandfmt_iscomplex( im->BandFmt ) ? 2 : 1); \
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const double c = tc[0]; \
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\
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int i; \
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\
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switch( im->BandFmt ) { \
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case IM_BANDFMT_CHAR: \
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CONST1( signed char, float, FUN ); break; \
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case IM_BANDFMT_UCHAR: \
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CONST1( unsigned char, float, FUN ); break; \
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case IM_BANDFMT_SHORT: \
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CONST1( signed short, float, FUN ); break; \
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case IM_BANDFMT_USHORT: \
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CONST1( unsigned short, float, FUN ); break; \
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case IM_BANDFMT_INT: \
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CONST1( signed int, float, FUN ); break; \
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case IM_BANDFMT_UINT: \
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CONST1( unsigned int, float, FUN ); break; \
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case IM_BANDFMT_FLOAT: \
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CONST1( float, float, FUN ); break; \
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case IM_BANDFMT_COMPLEX: \
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CONST1( float, float, FUN ); break; \
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case IM_BANDFMT_DOUBLE: \
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CONST1( double, double, FUN ); break; \
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case IM_BANDFMT_DPCOMPLEX: \
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CONST1( double, double, FUN ); break; \
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\
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default: \
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g_assert( 0 ); \
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} \
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}
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/* Operator with one constant per band.
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*/
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#define CONSTN( IN, OUT, FUN ) { \
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OUT *tq = (OUT *) q; \
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IN *tp = (IN *) p; \
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\
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for( i = 0, x = 0; x < n; x++ ) \
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for( b = 0; b < bands; b++, i++ ) \
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FUN( tq[i], tp[i], tc[b] ); \
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}
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/* Operator with one constant per band on a buffer.
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*/
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#define CONSTN_BUFFER( FUN ) \
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static void \
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FUN ## n_buffer( PEL *p, PEL *q, int n, double *tc, IMAGE *im ) \
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{ \
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const int bands = im->Bands; \
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\
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int i, x, b; \
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\
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switch( im->BandFmt ) { \
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case IM_BANDFMT_CHAR: \
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CONSTN( signed char, float, FUN ); break; \
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case IM_BANDFMT_UCHAR: \
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CONSTN( unsigned char, float, FUN ); break; \
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case IM_BANDFMT_SHORT: \
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CONSTN( signed short, float, FUN ); break; \
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case IM_BANDFMT_USHORT: \
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CONSTN( unsigned short, float, FUN ); break; \
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case IM_BANDFMT_INT: \
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CONSTN( signed int, float, FUN ); break; \
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case IM_BANDFMT_UINT: \
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CONSTN( unsigned int, float, FUN ); break; \
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case IM_BANDFMT_FLOAT: \
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CONSTN( float, float, FUN ); break; \
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case IM_BANDFMT_COMPLEX: \
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CONSTN( float, float, FUN ); break; \
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case IM_BANDFMT_DOUBLE: \
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CONSTN( double, double, FUN ); break; \
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case IM_BANDFMT_DPCOMPLEX: \
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CONSTN( double, double, FUN ); break; \
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\
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default: \
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g_assert( 0 ); \
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} \
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}
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#define POW( Y, X, E ) { \
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double x = (double) (X); \
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double e = (double) (E); \
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\
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if( x == 0.0 && e < 0.0 ) \
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/* Division by zero! Difficult to report tho' \
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*/ \
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(Y) = 0.0; \
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else \
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(Y) = pow( x, e ); \
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}
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CONST1_BUFFER( POW )
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CONSTN_BUFFER( POW )
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/* Save a bit of typing.
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*/
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#define F IM_BANDFMT_FLOAT
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#define X IM_BANDFMT_COMPLEX
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#define D IM_BANDFMT_DOUBLE
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#define DX IM_BANDFMT_DPCOMPLEX
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/* Type conversions for boolean.
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*/
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static int bandfmt_power[10] = {
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/* UC C US S UI I F X D DX */
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F, F, F, F, F, F, F, X, D, DX,
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};
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/**
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* im_powtra_vec:
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* @in: input #IMAGE
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* @out: output #IMAGE
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* @n: number of elements in array
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* @e: array of constants
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*
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* im_powtra_vec() transforms element x of input to
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* <function>pow</function>(x, @b) in output.
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* It detects division by zero, setting those pixels to zero in the output.
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* Beware: it does this silently!
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*
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* If the array of constants has one element, that constant is used for each
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* image band. If the array has more than one element, it must have the same
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* number of elements as there are bands in the image, and one array element
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* is used for each band.
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*
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* See also: im_logtra(), im_expntra_vec()
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_powtra_vec( IMAGE *in, IMAGE *out, int n, double *c )
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{
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if( im_check_noncomplex( "im_powtra_vec", in ) )
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return( -1 );
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return( im__arith_binary_const( "im_powtra_vec",
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in, out, n, c, IM_BANDFMT_DOUBLE,
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bandfmt_power,
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(im_wrapone_fn) POW1_buffer,
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(im_wrapone_fn) POWn_buffer ) );
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}
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/**
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* im_powtra:
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* @in: input #IMAGE
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* @out: output #IMAGE
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* @e: exponent
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*
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* im_powtra() transforms element x of input to
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* <function>pow</function>(x, @e) in output.
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* It detects division by zero, setting those pixels to zero in the output.
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* Beware: it does this silently!
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*
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* See also: im_logtra(), im_powntra_vec()
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_powtra( IMAGE *in, IMAGE *out, double e )
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{
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return( im_powtra_vec( in, out, 1, &e ) );
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}
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/* Converse of POW() above.
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*/
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#define POWC( Y, X, E ) POW( Y, E, X )
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CONST1_BUFFER( POWC )
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CONSTN_BUFFER( POWC )
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/**
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* im_expntra_vec:
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* @in: input #IMAGE
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* @out: output #IMAGE
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* @n: number of elements in array
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* @e: array of constants
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*
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* im_expntra_vec() transforms element x of input to
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* <function>pow</function>(@b, x) in output.
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* It detects division by zero, setting those pixels to zero in the output.
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* Beware: it does this silently!
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*
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* If the array of constants has one element, that constant is used for each
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* image band. If the array has more than one element, it must have the same
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* number of elements as there are bands in the image, and one array element
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* is used for each band.
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*
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* See also: im_logtra(), im_powtra()
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_expntra_vec( IMAGE *in, IMAGE *out, int n, double *c )
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{
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if( im_check_noncomplex( "im_expntra_vec", in ) )
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return( -1 );
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return( im__arith_binary_const( "im_expntra_vec",
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in, out, n, c, IM_BANDFMT_DOUBLE,
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bandfmt_power,
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(im_wrapone_fn) POWC1_buffer,
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(im_wrapone_fn) POWCn_buffer ) );
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}
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/**
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* im_expntra:
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* @in: input #IMAGE
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* @out: output #IMAGE
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* @e: base
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*
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* im_expntra() transforms element x of input to
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* <function>pow</function>(@e, x) in output.
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* It detects division by zero, setting those pixels to zero in the output.
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* Beware: it does this silently!
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*
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* See also: im_logtra(), im_powtra()
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_expntra( IMAGE *in, IMAGE *out, double e )
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{
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return( im_expntra_vec( in, out, 1, &e ) );
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}
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