168 lines
4.0 KiB
C
168 lines
4.0 KiB
C
/* @(#) Find natural log of any non-complex image. Output
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* @(#) is always float for integer input and double for double input.
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* @(#)
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* @(#) int
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* @(#) im_logtra( in, out )
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* @(#) IMAGE *in, *out;
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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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 JC
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* - adapted from im_lintra to work with partial images
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* - incorrect implementation of complex logs removed
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* 1/7/93 JC
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* - adapted for partial v2
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* - ANSIfied
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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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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Define what we do for each band element type. Non-complex input, any
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* output.
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*/
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#define loop(IN, OUT)\
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for( y = to; y < bo; y++ ) {\
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IN *p = (IN *) IM_REGION_ADDR( ir, le, y );\
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OUT *q = (OUT *) IM_REGION_ADDR( or, le, y );\
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\
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for( x = 0; x < sz; x++ )\
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*q++ = log( *p++ );\
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}
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/* logtra a small area.
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*/
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static int
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logtra_gen( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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Rect *r = &or->valid;
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int le = r->left;
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int to = r->top;
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int bo = IM_RECT_BOTTOM(r);
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int sz = IM_REGION_N_ELEMENTS( or );
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int x, y;
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/* Ask for input we need.
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*/
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if( im_prepare( ir, r ) )
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return( -1 );
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/* logtra all input types.
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*/
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switch( ir->im->BandFmt ) {
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case IM_BANDFMT_UCHAR: loop(unsigned char, float); break;
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case IM_BANDFMT_CHAR: loop(signed char, float); break;
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case IM_BANDFMT_USHORT: loop(unsigned short, float); break;
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case IM_BANDFMT_SHORT: loop(signed short, float); break;
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case IM_BANDFMT_UINT: loop(unsigned int, float); break;
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case IM_BANDFMT_INT: loop(signed int, float); break;
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case IM_BANDFMT_FLOAT: loop(float, float); break;
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case IM_BANDFMT_DOUBLE: loop(double, double); break;
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default:
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assert( 0 );
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}
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return( 0 );
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}
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/* Log transform.
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*/
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int
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im_logtra( IMAGE *in, IMAGE *out )
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{
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/* Check args.
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*/
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if( im_piocheck( in, out ) )
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return( -1 );
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if( in->Coding != IM_CODING_NONE ) {
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im_error( "im_logtra", _( "not uncoded" ) );
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return( -1 );
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}
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if( im_iscomplex( in ) ) {
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im_error( "im_logtra", _( "not non-complex" ) );
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return( -1 );
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}
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/* Prepare output header.
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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_UCHAR:
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case IM_BANDFMT_CHAR:
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case IM_BANDFMT_USHORT:
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case IM_BANDFMT_SHORT:
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case IM_BANDFMT_UINT:
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case IM_BANDFMT_INT:
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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_FLOAT:
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case IM_BANDFMT_DOUBLE:
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break;
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default:
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assert( 0 );
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}
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/* Set demand hints.
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*/
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if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
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return( -1 );
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/* Generate!
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*/
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if( im_generate( out,
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im_start_one, logtra_gen, im_stop_one, in, NULL ) )
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return( -1 );
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return( 0 );
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}
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