269 lines
7.0 KiB
C
269 lines
7.0 KiB
C
/* Subtract two images
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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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* 31/7/10
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* - remove liboil
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* 23/8/11
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* - rewrite as a class from add.c
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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/*
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#define DEBUG
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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 <glib/gi18n-lib.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 <vips/vips.h>
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#include "binary.h"
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typedef VipsBinary VipsSubtract;
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typedef VipsBinaryClass VipsSubtractClass;
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G_DEFINE_TYPE( VipsSubtract, vips_subtract, VIPS_TYPE_BINARY );
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#define LOOP( IN, OUT ) { \
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IN * restrict left = (IN *) in[0]; \
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IN * restrict right = (IN *) in[1]; \
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OUT * restrict q = (OUT *) out; \
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\
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for( x = 0; x < sz; x++ ) \
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q[x] = left[x] - right[x]; \
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}
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static void
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vips_subtract_buffer( VipsArithmetic *arithmetic,
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VipsPel *out, VipsPel **in, int width )
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{
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VipsImage *im = arithmetic->ready[0];
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/* Complex just doubles the size.
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*/
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const int sz = width * vips_image_get_bands( im ) *
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(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
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2 : 1);
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int x;
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/* Keep types here in sync with bandfmt_subtract[]
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* below.
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*/
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switch( vips_image_get_format( im ) ) {
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case VIPS_FORMAT_CHAR: LOOP( signed char, signed short ); break;
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case VIPS_FORMAT_UCHAR: LOOP( unsigned char, signed short ); break;
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case VIPS_FORMAT_SHORT: LOOP( signed short, signed int ); break;
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case VIPS_FORMAT_USHORT:LOOP( unsigned short, signed int ); break;
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case VIPS_FORMAT_INT: LOOP( signed int, signed int ); break;
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case VIPS_FORMAT_UINT: LOOP( unsigned int, signed int ); break;
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case VIPS_FORMAT_FLOAT:
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case VIPS_FORMAT_COMPLEX:
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LOOP( float, float );
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break;
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case VIPS_FORMAT_DOUBLE:
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case VIPS_FORMAT_DPCOMPLEX:
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LOOP( double, double );
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break;
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default:
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g_assert_not_reached();
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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 VIPS_FORMAT_UCHAR
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#define C VIPS_FORMAT_CHAR
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#define US VIPS_FORMAT_USHORT
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#define S VIPS_FORMAT_SHORT
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#define UI VIPS_FORMAT_UINT
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#define I VIPS_FORMAT_INT
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#define F VIPS_FORMAT_FLOAT
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#define X VIPS_FORMAT_COMPLEX
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#define D VIPS_FORMAT_DOUBLE
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#define DX VIPS_FORMAT_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 vips_subtract_buffer() above.
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*/
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static const VipsBandFormat vips_subtract_format_table[10] = {
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/* Band format: UC C US S UI I F X D DX */
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/* Promotion: */ S, S, I, I, I, I, F, X, D, DX
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};
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static void
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vips_subtract_class_init( VipsSubtractClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
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object_class->nickname = "subtract";
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object_class->description = _( "subtract two images" );
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aclass->process_line = vips_subtract_buffer;
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vips_arithmetic_set_format_table( aclass, vips_subtract_format_table );
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}
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static void
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vips_subtract_init( VipsSubtract *subtract )
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{
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}
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/**
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* vips_subtract:
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* @in1: input image
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* @in2: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* This operation calculates @in1 - @in2 and writes the result to @out.
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*
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* If the images differ in size, the smaller image is enlarged to match the
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* larger by adding zero pixels along the bottom and right.
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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 format (see table
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* Smallest common format in
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* <link linkend="libvips-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>VipsSubtract 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: vips_add(), vips_linear().
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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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vips_subtract( VipsImage *left, VipsImage *right, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "subtract", ap, left, right, out );
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va_end( ap );
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return( result );
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}
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