| /* im_c2real.c ... get real part of complex image |
| * |
| * Copyright: 1990, N. Dessipris. |
| * |
| * Author: Nicos Dessipris |
| * Written on: 12/02/1990 |
| * Modified on : 09/05/1990 |
| * 15/6/93 JC |
| * - stupid stupid includes and externs fixed |
| * - I have been editing for 1 1/2 hours and I'm still drowning in |
| * rubbish extetrnshh |
| * 13/12/94 JC |
| * - modernised |
| * 21/12/94 JC |
| * - im_c2amph() adapted to make im_c2real() and im_c2imag() |
| * 27/1/10 |
| * - modernised |
| * - gtk-doc |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| VIPS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| #define loop(TYPE) { \ |
| TYPE *p = (TYPE *) in; \ |
| TYPE *q = (TYPE *) out; \ |
| int x; \ |
| \ |
| for( x = 0; x < n; x++ ) { \ |
| q[x] = *p; \ |
| p += 2; \ |
| }\ |
| } |
| |
| /* c2real buffer processor. |
| */ |
| static void |
| buffer_c2real( void *in, void *out, int w, IMAGE *im ) |
| { |
| int n = w * im->Bands; |
| |
| switch( im->BandFmt ) { |
| case IM_BANDFMT_DPCOMPLEX: loop(double); break; |
| case IM_BANDFMT_COMPLEX: loop(float); break; |
| default: |
| g_assert( 0 ); |
| } |
| } |
| |
| /** |
| * im_c2real: |
| * @in: input image |
| * @out: output image |
| * |
| * Extract the real part of a complex image. |
| * |
| * See also: im_c2imag(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_c2real( IMAGE *in, IMAGE *out ) |
| { |
| if( im_check_uncoded( "im_c2real", in ) || |
| im_check_complex( "im_c2real", in ) || |
| im_cp_desc( out, in ) ) |
| return( -1 ); |
| |
| /* Output will be float or double. |
| */ |
| if( in->BandFmt == IM_BANDFMT_DPCOMPLEX ) |
| out->BandFmt = IM_BANDFMT_DOUBLE; |
| else |
| out->BandFmt = IM_BANDFMT_FLOAT; |
| |
| if( im_wrapone( in, out, |
| (im_wrapone_fn) buffer_c2real, in, NULL ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |