270 lines
7.0 KiB
C
270 lines
7.0 KiB
C
/* @(#) Subtract two images
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* @(#) Images must have the same no of bands and can be of any type
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* @(#) No check for overflow is carried out.
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* @(#)
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* @(#) int
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* @(#) im_subtract( in1, in2, out)
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* @(#) IMAGE *in1, *in2, *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.
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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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* 29/4/93 J.Cupitt
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* - now works for partial images
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* 1/7/93 JC
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* - adapted for partial v2
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* 9/5/95 JC
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* - simplified: now just handles 10 cases (instead of 50), using
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* im_clip2*() to help
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* - now uses im_wrapmany() rather than im_generate()
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* 12/6/95 JC
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* - new im_add() adapted to make this
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* 31/5/96 JC
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* - what was this SWAP() stuff? failed for small - big!
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* 22/8/03 JC
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* - cast up more quickly to help accuracy
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* 27/9/04
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* - updated for 1 band $op n band image -> n band image case
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* 8/12/06
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* - add liboil support
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* 18/8/08
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* - revise upcasting system
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* - add gtkdoc comments
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* - remove separate complex case, just double size
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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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#define LOOP( IN, OUT ) { \
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IN *p1 = (IN *) in[0]; \
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IN *p2 = (IN *) in[1]; \
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OUT *q = (OUT *) out; \
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\
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for( x = 0; x < sz; x++ ) \
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q[x] = p1[x] - p2[x]; \
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}
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static void
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subtract_buffer( PEL **in, PEL *out, int width, 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 sz = width * im->Bands * (im_iscomplex( im ) ? 2 : 1);
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int x;
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/* Add all input types. Keep types here in sync with bandfmt_subtract[]
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* below.
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*/
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switch( im->BandFmt ) {
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case IM_BANDFMT_CHAR: LOOP( signed char, signed short ); break;
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case IM_BANDFMT_UCHAR: LOOP( unsigned char, signed short ); break;
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case IM_BANDFMT_SHORT: LOOP( signed short, signed int ); break;
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case IM_BANDFMT_USHORT: LOOP( unsigned short, signed int ); break;
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case IM_BANDFMT_INT: LOOP( signed int, signed int ); break;
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case IM_BANDFMT_UINT: LOOP( unsigned int, signed int ); break;
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case IM_BANDFMT_FLOAT:
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case IM_BANDFMT_COMPLEX:
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#ifdef HAVE_LIBOIL
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oil_subtract_f32( (float *) out,
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(float *) in[0], (float *) in[1], sz );
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#else /*!HAVE_LIBOIL*/
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LOOP( float, 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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case IM_BANDFMT_DPCOMPLEX:
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LOOP( double, 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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}
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/* Save a bit of typing.
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*/
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#define UC IM_BANDFMT_UCHAR
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#define C IM_BANDFMT_CHAR
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#define US IM_BANDFMT_USHORT
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#define S IM_BANDFMT_SHORT
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#define UI IM_BANDFMT_UINT
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#define I IM_BANDFMT_INT
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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 promotion for subtraction. Sign and value preserving. Make sure these
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* match the case statement in subtract_buffer() above.
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*/
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static int bandfmt_subtract[10] = {
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/* UC C US S UI I F X D DX */
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S, S, I, I, I, I, F, X, D, DX
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};
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/**
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* im_subtract:
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* @in1: input image 1
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* @in2: input image 2
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* @out: output image
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*
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* This operation calculates @in1 - @in2 and writes the result to @out.
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* The images must be the same size. They may have any format.
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*
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* If the number of bands differs, one of the images
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* must have one band. In this case, an n-band image is formed from the
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* one-band image by joining n copies of the one-band image together, and then
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* the two n-band images are operated upon.
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*
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* The two input images are cast up to the smallest common type (see table
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* Smallest common format in
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* <link linkend="VIPS-arithmetic">arithmetic</link>), then the
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* following table is used to determine the output type:
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*
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* <table>
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* <title>im_subtract() type promotion</title>
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* <tgroup cols='2' align='left' colsep='1' rowsep='1'>
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* <thead>
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* <row>
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* <entry>input type</entry>
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* <entry>output type</entry>
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* </row>
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* </thead>
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* <tbody>
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* <row>
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* <entry>uchar</entry>
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* <entry>short</entry>
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* </row>
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* <row>
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* <entry>char</entry>
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* <entry>short</entry>
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* </row>
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* <row>
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* <entry>ushort</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>short</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>uint</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>int</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>float</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>double</entry>
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* <entry>double</entry>
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* </row>
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* <row>
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* <entry>complex</entry>
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* <entry>complex</entry>
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* </row>
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* <row>
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* <entry>double complex</entry>
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* <entry>double complex</entry>
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* </row>
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* </tbody>
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* </tgroup>
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* </table>
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*
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* In other words, the output type is just large enough to hold the whole
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* range of possible values.
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*
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* See also: im_add(), im_lintra().
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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_subtract( IMAGE *in1, IMAGE *in2, IMAGE *out )
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{
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if( im_piocheck( in1, out ) ||
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im_pincheck( in2 ) ||
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im_check_bands_1orn( "im_subtract", in1, in2 ) ||
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im_check_uncoded( "im_subtract", in1 ) ||
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im_check_uncoded( "im_subtract", in2 ) )
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return( -1 );
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if( im_cp_descv( out, in1, in2, NULL ) )
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return( -1 );
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/* What number of bands will we write?
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*/
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out->Bands = IM_MAX( in1->Bands, in2->Bands );
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/* What output type will we write? int, float or complex.
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*/
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out->BandFmt = bandfmt_subtract[im__format_common( in1, in2 )];
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out->Bbits = im_bits_of_fmt( out->BandFmt );
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/* And process!
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*/
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if( im__cast_and_call( in1, in2, out,
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(im_wrapmany_fn) subtract_buffer, NULL ) )
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return( -1 );
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/* Success!
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*/
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return( 0 );
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}
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