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John Cupitt
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229
libvips/arithmetic/ifthenelse.c
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229
libvips/arithmetic/ifthenelse.c
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/* im_ifthenelse.c --- use a condition image to join two images together
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*
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* Modified:
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* 9/2/95 JC
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* - partialed and ANSIfied
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* 11/9/95 JC
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* - return( 0 ) missing! oops
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* 15/4/05
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* - now just evals left/right if all zero/all one
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* 7/10/06
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* - set THINSTRIP
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* 23/9/09
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* - gtkdoc comment
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* 23/9/09
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* - use im_check*()
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* - allow many-band conditional and single-band a/b
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* - allow a/b to differ in format and bands
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* 25/6/10
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* - let the conditional image be any format by adding a (!=0) if
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* necessary
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* 17/5/11
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* - added sizealike
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* 14/11/11
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* - redone as a class
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU 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 General Public License for more details.
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You should have received a copy of the GNU 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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/*
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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 <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include "binary.h"
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#include "unaryconst.h"
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/**
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* VipsIfthenelse:
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* @left: left-hand input #VipsImage
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* @right: right-hand input #VipsImage
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* @out: output #VipsImage
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* @ifthenelse: ifthenelse operation to perform
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*
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* Perform various ifthenelse operations on pairs of images.
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*
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* The output type is always uchar, with 0 for FALSE and 255 for TRUE.
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*
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* Less-than and greater-than for complex images compare the modulus.
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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 type (see table
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* Smallest common format in
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* <link linkend="VIPS-arithmetic">arithmetic</link>).
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*
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* See also: #VipsBoolean, #VipsIfthenelseConst.
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*/
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typedef struct _VipsIfthenelse {
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VipsBinary parent_instance;
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/* The condition image is always uchar.
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*/
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VipsImage *condition;
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} VipsIfthenelse;
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typedef VipsBinaryClass VipsIfthenelseClass;
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G_DEFINE_TYPE( VipsIfthenelse, vips_ifthenelse, VIPS_TYPE_BINARY );
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static int
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vips_ifthenelse_build( VipsObject *object )
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{
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VipsIfthenelse *ifthenelse = (VipsIfthenelse *) object;
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VipsArithmetic *arithmetic = (VipsArithmetic *) object;
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if( VIPS_OBJECT_CLASS( vips_ifthenelse_parent_class )->build( object ) )
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return( -1 );
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return( 0 );
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}
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#define RLOOP( TYPE, ROP ) { \
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TYPE *left = (TYPE *) in[0]; \
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TYPE *right = (TYPE *) in[1]; \
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PEL *q = (PEL *) out; \
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\
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for( x = 0; x < sz; x++ ) \
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q[x] = (left[x] ROP right[x]) ? 255 : 0; \
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}
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#define CLOOP( TYPE, COP ) { \
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TYPE *left = (TYPE *) in[0]; \
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TYPE *right = (TYPE *) in[1]; \
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PEL *q = (PEL *) out; \
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\
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for( x = 0; x < sz; x++ ) { \
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q[x] = COP( left[0], left[1], right[0], right[1]) ? 255 : 0; \
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\
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left += 2; \
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right += 2; \
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} \
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}
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static void
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vips_ifthenelse_buffer( VipsArithmetic *arithmetic,
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PEL *out, PEL **in, int width )
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{
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VipsIfthenelse *ifthenelse = (VipsIfthenelse *) arithmetic;
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VipsImage *im = arithmetic->ready[0];
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const int sz = width * vips_image_get_bands( im );
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int x;
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switch( vips_image_get_format( im ) ) {
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case VIPS_FORMAT_UCHAR: R( unsigned char, ROP ); break;
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case VIPS_FORMAT_CHAR: R( signed char, ROP ); break;
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case VIPS_FORMAT_USHORT: R( unsigned short, ROP ); break;
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case VIPS_FORMAT_SHORT: R( signed short, ROP ); break;
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case VIPS_FORMAT_UINT: R( unsigned int, ROP ); break;
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case VIPS_FORMAT_INT: R( signed int, ROP ); break;
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case VIPS_FORMAT_FLOAT: R( float, ROP ); break;
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case VIPS_FORMAT_DOUBLE: R( double, ROP ); break;
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case VIPS_FORMAT_COMPLEX: C( float, COP ); break;
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case VIPS_FORMAT_DPCOMPLEX: C( double, COP ); break;
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default:
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g_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 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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static const VipsBandFormat vips_bandfmt_ifthenelse[10] = {
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/* UC C US S UI I F X D DX */
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UC, C, US, S, UI, I, F, X, D, DX
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};
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static void
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vips_ifthenelse_class_init( VipsIfthenelseClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "ifthenelse";
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object_class->description =
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_( "a ifthenelse operation on a pair of images" );
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object_class->build = vips_ifthenelse_build;
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vips_arithmetic_set_format_table( aclass, vips_bandfmt_ifthenelse );
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aclass->process_line = vips_ifthenelse_buffer;
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}
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static void
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vips_ifthenelse_init( VipsIfthenelse *ifthenelse )
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{
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}
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int
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vips_ifthenelse( VipsImage *left, VipsImage *right, VipsImage **out,
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VipsOperationIfthenelse ifthenelse, ... )
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{
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va_list ap;
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int result;
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va_start( ap, ifthenelse );
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result = vips_call_split( "ifthenelse", ap, left, right, out,
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ifthenelse );
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va_end( ap );
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return( result );
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}
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