/* boolean.c --- various bit operations
 *
 * Modified: 
 * 15/12/94 JC
 * 	- ANSIfied
 * 	- adapted to partials with im_wrap...
 * 25/1/95 JC
 *	- added check1ary(), check2ary()
 * 8/2/95 JC
 *	- new im_wrapmany
 * 19/7/95 JC
 *	- added im_shiftleft() and im_shiftright()
 * 6/7/98 JC
 *	- added _vec forms
 * 	- removed *p++ stuff
 * 10/9/99 JC
 *	- and/or/eor now do all int types
 * 10/10/02 JC
 *	- renamed im_and() etc. as im_andimage() to remove breakage in the C++
 *	  layer if operator names are turned on
 * 30/6/04
 *	- now cast float/complex args to int
 * 11/9/09
 * 	- use new im__cast_and__call()
 * 	- therefore now supports 1-band $op n-band 
 * 17/9/09
 * 	- moved to im__arith_binary*()
 * 	- renamed im_eor_vec() as im_eorimage_vec() for C++ sanity
 * 21/11/10
 * 	- oop, constants are always (int) now, so (^-1) works for unsigned
 * 	  types
 * 12/11/11
 * 	- redo as a class
 */

/*

    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 <vips/vips.h>

#include "binary.h"
#include "unaryconst.h"

typedef struct _VipsBoolean {
	VipsBinary parent_instance;

	VipsOperationBoolean operation;

} VipsBoolean;

typedef VipsBinaryClass VipsBooleanClass;

G_DEFINE_TYPE( VipsBoolean, vips_boolean, VIPS_TYPE_BINARY );

static int
vips_boolean_build( VipsObject *object )
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
	VipsBinary *binary = (VipsBinary *) object;

	if( binary->left &&
		vips_check_noncomplex( class->nickname, binary->left ) )
		return( -1 );
	if( binary->right &&
		vips_check_noncomplex( class->nickname, binary->right ) )
		return( -1 );

	if( VIPS_OBJECT_CLASS( vips_boolean_parent_class )->build( object ) )
		return( -1 );

	return( 0 );
}

#define LOOP( TYPE, OP ) { \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	TYPE * restrict q = (TYPE *) out; \
	\
	for( x = 0; x < sz; x++ ) \
		q[x] = left[x] OP right[x]; \
}

#define FLOOP( TYPE, OP ) { \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	int * restrict q = (int *) out; \
	\
	for( x = 0; x < sz; x++ ) \
		q[x] = ((int) left[x]) OP ((int) right[x]); \
}

#define SWITCH( I, F, OP ) \
	switch( vips_image_get_format( im ) ) { \
	case VIPS_FORMAT_UCHAR:		I( unsigned char, OP ); break; \
	case VIPS_FORMAT_CHAR:		I( signed char, OP ); break; \
	case VIPS_FORMAT_USHORT: 	I( unsigned short, OP ); break; \
	case VIPS_FORMAT_SHORT: 	I( signed short, OP ); break; \
	case VIPS_FORMAT_UINT: 		I( unsigned int, OP ); break; \
	case VIPS_FORMAT_INT: 		I( signed int, OP ); break; \
	case VIPS_FORMAT_FLOAT: 	F( float, OP ); break; \
	case VIPS_FORMAT_DOUBLE: 	F( double, OP ); break;\
 	\
	default: \
		g_assert( 0 ); \
	} 

static void
vips_boolean_buffer( VipsArithmetic *arithmetic, 
	VipsPel *out, VipsPel **in, int width )
{
	VipsBoolean *boolean = (VipsBoolean *) arithmetic;
	VipsImage *im = arithmetic->ready[0];
	const int sz = width * vips_image_get_bands( im );

	int x;

	switch( boolean->operation ) {
	case VIPS_OPERATION_BOOLEAN_AND: 	
		SWITCH( LOOP, FLOOP, & ); 
		break;

	case VIPS_OPERATION_BOOLEAN_OR: 	
		SWITCH( LOOP, FLOOP, | ); 
		break;

	case VIPS_OPERATION_BOOLEAN_EOR: 	
		SWITCH( LOOP, FLOOP, ^ ); 
		break;

	case VIPS_OPERATION_BOOLEAN_LSHIFT: 	
		SWITCH( LOOP, FLOOP, << ); 
		break;

	case VIPS_OPERATION_BOOLEAN_RSHIFT: 	
		SWITCH( LOOP, FLOOP, >> ); 
		break;

	default:
		g_assert( 0 );
	}
}

/* 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 conversions for boolean. 
 */
static const VipsBandFormat vips_boolean_format_table[10] = {
/* UC  C   US  S   UI  I   F   X   D   DX */
   UC, C,  US, S,  UI, I,  I,  I,  I,  I,
};

static void
vips_boolean_class_init( VipsBooleanClass *class )
{
	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "boolean";
	object_class->description = _( "boolean operation on two images" );
	object_class->build = vips_boolean_build;

	aclass->process_line = vips_boolean_buffer;

	vips_arithmetic_set_format_table( aclass, vips_boolean_format_table ); 

	VIPS_ARG_ENUM( class, "boolean", 200, 
		_( "Operation" ), 
		_( "boolean to perform" ),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET( VipsBoolean, operation ),
		VIPS_TYPE_OPERATION_BOOLEAN, 
			VIPS_OPERATION_BOOLEAN_AND ); 
}

static void
vips_boolean_init( VipsBoolean *boolean )
{
}

static int
vips_booleanv( VipsImage *left, VipsImage *right, VipsImage **out, 
	VipsOperationBoolean operation, va_list ap )
{
	return( vips_call_split( "boolean", ap, left, right, out, 
		operation ) );
}

/**
 * vips_boolean:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @boolean: boolean operation to perform
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform various boolean operations on pairs of images. 
 *
 * The output image is the same format as the upcast input images for integer
 * types. Float types are cast to int before processing. Complex types are not
 * supported.
 *
 * 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>).
 *
 * See also: vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_boolean( VipsImage *left, VipsImage *right, VipsImage **out, 
	VipsOperationBoolean boolean, ... )
{
	va_list ap;
	int result;

	va_start( ap, boolean );
	result = vips_booleanv( left, right, out, boolean, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_andimage:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_AND on a pair of images. See
 * vips_boolean().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_andimage( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
	va_list ap;
	int result;

	va_start( ap, out );
	result = vips_booleanv( left, right, out, 
		VIPS_OPERATION_BOOLEAN_AND, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_orimage:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_OR on a pair of images. See
 * vips_boolean().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_orimage( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
	va_list ap;
	int result;

	va_start( ap, out );
	result = vips_booleanv( left, right, out, 
		VIPS_OPERATION_BOOLEAN_OR, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_eorimage:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_EOR on a pair of images. See
 * vips_boolean().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_eorimage( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
	va_list ap;
	int result;

	va_start( ap, out );
	result = vips_booleanv( left, right, out, 
		VIPS_OPERATION_BOOLEAN_EOR, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_lshift:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_LSHIFT on a pair of images. See
 * vips_boolean().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_lshift( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
	va_list ap;
	int result;

	va_start( ap, out );
	result = vips_booleanv( left, right, out, 
		VIPS_OPERATION_BOOLEAN_LSHIFT, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_rshift:
 * @left: left-hand input #VipsImage
 * @right: right-hand input #VipsImage
 * @out: output #VipsImage
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_RSHIFT on a pair of images. See
 * vips_boolean().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_rshift( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
	va_list ap;
	int result;

	va_start( ap, out );
	result = vips_booleanv( left, right, out, 
		VIPS_OPERATION_BOOLEAN_RSHIFT, ap );
	va_end( ap );

	return( result );
}

typedef struct _VipsBooleanConst {
	VipsUnaryConst parent_instance;

	VipsOperationBoolean operation;
} VipsBooleanConst;

typedef VipsUnaryConstClass VipsBooleanConstClass;

G_DEFINE_TYPE( VipsBooleanConst, 
	vips_boolean_const, VIPS_TYPE_UNARY_CONST );

static int
vips_boolean_const_build( VipsObject *object )
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
	VipsUnary *unary = (VipsUnary *) object;
	VipsUnaryConst *uconst = (VipsUnaryConst *) object;

	if( unary->in &&
		vips_check_noncomplex( class->nickname, unary->in ) )
		return( -1 );

	uconst->const_format = VIPS_FORMAT_INT;

	if( VIPS_OBJECT_CLASS( vips_boolean_const_parent_class )->
		build( object ) )
		return( -1 );

	return( 0 );
}

#define LOOPC( TYPE, OP ) { \
	TYPE *p = (TYPE *) in[0]; \
	TYPE *q = (TYPE *) out; \
	int *c = (int *) uconst->c_ready; \
 	\
	for( i = 0, x = 0; x < width; x++ ) \
		for( b = 0; b < bands; b++, i++ ) \
			q[i] = p[i] OP c[b]; \
}

#define FLOOPC( TYPE, OP ) { \
	TYPE *p = (TYPE *) in[0]; \
	int *q = (int *) out; \
	int *c = (int *) uconst->c_ready; \
 	\
	for( i = 0, x = 0; x < width; x++ ) \
		for( b = 0; b < bands; b++, i++ ) \
			q[i] = ((int) p[i]) OP ((int) c[b]); \
}

static void
vips_boolean_const_buffer( VipsArithmetic *arithmetic, 
	VipsPel *out, VipsPel **in, int width )
{
	VipsUnaryConst *uconst = (VipsUnaryConst *) arithmetic;
	VipsBooleanConst *bconst = (VipsBooleanConst *) arithmetic;
	VipsImage *im = arithmetic->ready[0];
	int bands = im->Bands;

	int i, x, b;

	switch( bconst->operation ) {
	case VIPS_OPERATION_BOOLEAN_AND: 	
		SWITCH( LOOPC, FLOOPC, & ); 
		break;

	case VIPS_OPERATION_BOOLEAN_OR: 	
		SWITCH( LOOPC, FLOOPC, | ); 
		break;

	case VIPS_OPERATION_BOOLEAN_EOR: 	
		SWITCH( LOOPC, FLOOPC, ^ ); 
		break;

	case VIPS_OPERATION_BOOLEAN_LSHIFT: 	
		SWITCH( LOOPC, FLOOPC, << ); 
		break;

	case VIPS_OPERATION_BOOLEAN_RSHIFT: 	
		SWITCH( LOOPC, FLOOPC, >> ); 
		break;

	default:
		g_assert( 0 );
	}
}

static void
vips_boolean_const_class_init( VipsBooleanConstClass *class )
{
	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "boolean_const";
	object_class->description = 
		_( "boolean operations against a constant" );
	object_class->build = vips_boolean_const_build;

	aclass->process_line = vips_boolean_const_buffer;

	vips_arithmetic_set_format_table( aclass, vips_boolean_format_table ); 

	VIPS_ARG_ENUM( class, "boolean", 200, 
		_( "Operation" ), 
		_( "boolean to perform" ),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET( VipsBooleanConst, operation ),
		VIPS_TYPE_OPERATION_BOOLEAN, 
			VIPS_OPERATION_BOOLEAN_AND ); 
}

static void
vips_boolean_const_init( VipsBooleanConst *boolean_const )
{
}

static int
vips_boolean_constv( VipsImage *in, VipsImage **out, 
	VipsOperationBoolean operation, double *c, int n, va_list ap )
{
	VipsArea *area_c;
	double *array; 
	int result;
	int i;

	area_c = vips_area_new_array( G_TYPE_DOUBLE, sizeof( double ), n ); 
	array = (double *) area_c->data;
	for( i = 0; i < n; i++ ) 
		array[i] = c[i];

	result = vips_call_split( "boolean_const", ap, 
		in, out, operation, area_c );

	vips_area_unref( area_c );

	return( result );
}

/**
 * vips_boolean_const:
 * @in: input image
 * @out: output image
 * @boolean: boolean operation to perform
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform various boolean operations on an image against an array of
 * constants.
 *
 * The output type is always uchar, with 0 for FALSE and 255 for TRUE. 
 *
 * If the array of constants has just one element, that constant is used for 
 * all image bands. If the array has more than one element and they have 
 * the same number of elements as there are bands in the image, then 
 * one array element is used for each band. If the arrays have more than one
 * element and the image only has a single band, the result is a many-band
 * image where each band corresponds to one array element.
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_boolean_const( VipsImage *in, VipsImage **out, 
	VipsOperationBoolean boolean, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, boolean, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_andimage_const:
 * @in: input image
 * @out: output image
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_AND on an image and an array of constants.
 * See vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_andimage_const( VipsImage *in, VipsImage **out, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_AND, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_orimage_const:
 * @in: input image
 * @out: output image
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_OR on an image and an array of constants.
 * See vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_orimage_const( VipsImage *in, VipsImage **out, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_OR, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_eorimage_const:
 * @in: input image
 * @out: output image
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_EOR on an image and an array of constants.
 * See vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_eorimage_const( VipsImage *in, VipsImage **out, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_EOR, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_lshift_const:
 * @in: input image
 * @out: output image
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_LSHIFT on an image and an array of constants.
 * See vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_lshift_const( VipsImage *in, VipsImage **out, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_LSHIFT, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_rshift_const:
 * @in: input image
 * @out: output image
 * @c: array of constants 
 * @n: number of constants in @c
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_LSHIFT on an image and an array of constants.
 * See vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const1().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_rshift_const( VipsImage *in, VipsImage **out, double *c, int n, ... )
{
	va_list ap;
	int result;

	va_start( ap, n );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_RSHIFT, c, n, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_boolean_const1:
 * @in: input image
 * @out: output image
 * @boolean: boolean operation to perform
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform various boolean operations on an image with a single constant. See
 * vips_boolean_const().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_boolean_const1( VipsImage *in, VipsImage **out, 
	VipsOperationBoolean boolean, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, boolean, &c, 1, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_andimage_const1:
 * @in: input image
 * @out: output image
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_AND on an image and a constant.
 * See vips_boolean_const1().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_andimage_const1( VipsImage *in, VipsImage **out, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_AND, &c, 1, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_orimage_const1:
 * @in: input image
 * @out: output image
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_OR on an image and a constant.
 * See vips_boolean_const1().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_orimage_const1( VipsImage *in, VipsImage **out, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_OR, &c, 1, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_eorimage_const1:
 * @in: input image
 * @out: output image
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_EOR on an image and a constant.
 * See vips_boolean_const1().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_eorimage_const1( VipsImage *in, VipsImage **out, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_EOR, &c, 1, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_lshift_const1:
 * @in: input image
 * @out: output image
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_LSHIFT on an image and a constant.
 * See vips_boolean_const1().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_lshift_const1( VipsImage *in, VipsImage **out, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_LSHIFT, &c, 1, ap );
	va_end( ap );

	return( result );
}

/**
 * vips_rshift_const1:
 * @in: input image
 * @out: output image
 * @c: constant 
 * @...: %NULL-terminated list of optional named arguments
 *
 * Perform #VIPS_OPERATION_BOOLEAN_RSHIFT on an image and a constant.
 * See vips_boolean_const1().
 *
 * See also: vips_boolean(), vips_boolean_const().
 *
 * Returns: 0 on success, -1 on error
 */
int
vips_rshift_const1( VipsImage *in, VipsImage **out, double c, ... )
{
	va_list ap;
	int result;

	va_start( ap, c );
	result = vips_boolean_constv( in, out, 
		VIPS_OPERATION_BOOLEAN_RSHIFT, &c, 1, ap );
	va_end( ap );

	return( result );
}
