269 lines
7.0 KiB
C
269 lines
7.0 KiB
C
/* Subtract two images
|
|
*
|
|
* Copyright: 1990, N. Dessipris.
|
|
*
|
|
* Author: Nicos Dessipris
|
|
* Written on: 02/05/1990
|
|
* Modified on:
|
|
* 29/4/93 J.Cupitt
|
|
* - now works for partial images
|
|
* 1/7/93 JC
|
|
* - adapted for partial v2
|
|
* 9/5/95 JC
|
|
* - simplified: now just handles 10 cases (instead of 50), using
|
|
* im_clip2*() to help
|
|
* - now uses im_wrapmany() rather than im_generate()
|
|
* 12/6/95 JC
|
|
* - new im_add() adapted to make this
|
|
* 31/5/96 JC
|
|
* - what was this SWAP() stuff? failed for small - big!
|
|
* 22/8/03 JC
|
|
* - cast up more quickly to help accuracy
|
|
* 27/9/04
|
|
* - updated for 1 band $op n band image -> n band image case
|
|
* 8/12/06
|
|
* - add liboil support
|
|
* 18/8/08
|
|
* - revise upcasting system
|
|
* - add gtkdoc comments
|
|
* - remove separate complex case, just double size
|
|
* 31/7/10
|
|
* - remove liboil
|
|
* 23/8/11
|
|
* - rewrite as a class from add.c
|
|
*/
|
|
|
|
/*
|
|
|
|
Copyright (C) 1991-2005 The National Gallery
|
|
|
|
This library 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library 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 library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
|
|
|
|
*/
|
|
|
|
/*
|
|
#define DEBUG
|
|
*/
|
|
|
|
#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>
|
|
|
|
#include "binary.h"
|
|
|
|
typedef VipsBinary VipsSubtract;
|
|
typedef VipsBinaryClass VipsSubtractClass;
|
|
|
|
G_DEFINE_TYPE( VipsSubtract, vips_subtract, VIPS_TYPE_BINARY );
|
|
|
|
#define LOOP( IN, OUT ) { \
|
|
IN * restrict left = (IN *) in[0]; \
|
|
IN * restrict right = (IN *) in[1]; \
|
|
OUT * restrict q = (OUT *) out; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) \
|
|
q[x] = left[x] - right[x]; \
|
|
}
|
|
|
|
static void
|
|
vips_subtract_buffer( VipsArithmetic *arithmetic,
|
|
VipsPel *out, VipsPel **in, int width )
|
|
{
|
|
VipsImage *im = arithmetic->ready[0];
|
|
|
|
/* Complex just doubles the size.
|
|
*/
|
|
const int sz = width * vips_image_get_bands( im ) *
|
|
(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
|
|
2 : 1);
|
|
|
|
int x;
|
|
|
|
/* Keep types here in sync with bandfmt_subtract[]
|
|
* below.
|
|
*/
|
|
switch( vips_image_get_format( im ) ) {
|
|
case VIPS_FORMAT_CHAR: LOOP( signed char, signed short ); break;
|
|
case VIPS_FORMAT_UCHAR: LOOP( unsigned char, signed short ); break;
|
|
case VIPS_FORMAT_SHORT: LOOP( signed short, signed int ); break;
|
|
case VIPS_FORMAT_USHORT:LOOP( unsigned short, signed int ); break;
|
|
case VIPS_FORMAT_INT: LOOP( signed int, signed int ); break;
|
|
case VIPS_FORMAT_UINT: LOOP( unsigned int, signed int ); break;
|
|
|
|
case VIPS_FORMAT_FLOAT:
|
|
case VIPS_FORMAT_COMPLEX:
|
|
LOOP( float, float );
|
|
break;
|
|
|
|
case VIPS_FORMAT_DOUBLE:
|
|
case VIPS_FORMAT_DPCOMPLEX:
|
|
LOOP( double, double );
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
/* Save a bit of typing.
|
|
*/
|
|
#define UC VIPS_FORMAT_UCHAR
|
|
#define C VIPS_FORMAT_CHAR
|
|
#define US VIPS_FORMAT_USHORT
|
|
#define S VIPS_FORMAT_SHORT
|
|
#define UI VIPS_FORMAT_UINT
|
|
#define I VIPS_FORMAT_INT
|
|
#define F VIPS_FORMAT_FLOAT
|
|
#define X VIPS_FORMAT_COMPLEX
|
|
#define D VIPS_FORMAT_DOUBLE
|
|
#define DX VIPS_FORMAT_DPCOMPLEX
|
|
|
|
/* Type promotion for subtraction. Sign and value preserving. Make sure these
|
|
* match the case statement in vips_subtract_buffer() above.
|
|
*/
|
|
static const VipsBandFormat vips_subtract_format_table[10] = {
|
|
/* UC C US S UI I F X D DX */
|
|
S, S, I, I, I, I, F, X, D, DX
|
|
};
|
|
|
|
static void
|
|
vips_subtract_class_init( VipsSubtractClass *class )
|
|
{
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
|
|
|
|
object_class->nickname = "subtract";
|
|
object_class->description = _( "subtract two images" );
|
|
|
|
aclass->process_line = vips_subtract_buffer;
|
|
|
|
vips_arithmetic_set_format_table( aclass, vips_subtract_format_table );
|
|
}
|
|
|
|
static void
|
|
vips_subtract_init( VipsSubtract *subtract )
|
|
{
|
|
}
|
|
|
|
/**
|
|
* vips_subtract:
|
|
* @in1: input image
|
|
* @in2: input image
|
|
* @out: (out): output image
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* This operation calculates @in1 - @in2 and writes the result to @out.
|
|
*
|
|
* If the images differ in size, the smaller image is enlarged to match the
|
|
* larger by adding zero pixels along the bottom and right.
|
|
*
|
|
* If the number of bands differs, one of the images
|
|
* must have one band. In this case, an n-band image is formed from the
|
|
* one-band image by joining n copies of the one-band image together, and then
|
|
* the two n-band images are operated upon.
|
|
*
|
|
* The two input images are cast up to the smallest common format (see table
|
|
* Smallest common format in
|
|
* <link linkend="libvips-arithmetic">arithmetic</link>), then the
|
|
* following table is used to determine the output type:
|
|
*
|
|
* <table>
|
|
* <title>VipsSubtract type promotion</title>
|
|
* <tgroup cols='2' align='left' colsep='1' rowsep='1'>
|
|
* <thead>
|
|
* <row>
|
|
* <entry>input type</entry>
|
|
* <entry>output type</entry>
|
|
* </row>
|
|
* </thead>
|
|
* <tbody>
|
|
* <row>
|
|
* <entry>uchar</entry>
|
|
* <entry>short</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>char</entry>
|
|
* <entry>short</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>ushort</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>short</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>uint</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>int</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>float</entry>
|
|
* <entry>float</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>double</entry>
|
|
* <entry>double</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>complex</entry>
|
|
* <entry>complex</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>double complex</entry>
|
|
* <entry>double complex</entry>
|
|
* </row>
|
|
* </tbody>
|
|
* </tgroup>
|
|
* </table>
|
|
*
|
|
* In other words, the output type is just large enough to hold the whole
|
|
* range of possible values.
|
|
*
|
|
* See also: vips_add(), vips_linear().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_subtract( VipsImage *left, VipsImage *right, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "subtract", ap, left, right, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|