<commit_before>/* Divide two images
 *
 * Copyright: 1990, <NAME>.
 *
 * Author: <NAME>
 * Written on: 02/05/1990
 * Modified on: 
 * 29/4/93 JC
 *	- now works for partial images
 * 1/7/93 JC
 *	- adapted for partial v2
 *	- ANSIfied
 * 19/10/93 JC
 *	- coredump-inducing bug in complex*complex fixed
 * 13/12/93
 *	- char*short bug fixed
 * 12/6/95 JC
 *	- new im_multiply adapted to make new im_divide
 * 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
 * 31/7/10
 * 	- remove liboil support
 * 	- avoid /0 
 * 6/11/11
 * 	- rewrite as a class 
 * 22/2/12
 * 	- avoid /0 for complex as well
 * 6/4/12
 * 	- fixed switch cases
 *	- fixed int operands with <1 result
 */

/*

    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 VipsDivide;
typedef VipsBinaryClass VipsDivideClass;

G_DEFINE_TYPE( VipsDivide, vips_divide, VIPS_TYPE_BINARY );

/* Complex divide.
 */
#ifdef USE_MODARG_DIV

/* This is going to be much slower */
#define CLOOP( TYPE ) { \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	TYPE * restrict q = (TYPE *) out; \
	int i; \
        \
	for( i = 0; i < sz; i++ ) { \
		if( right[0] == 0.0 && \
			right[1] == 0.0 ) { \
			q[0] = 0.0; \
			q[1] = 0.0; \
		} \
		else { \
			double arg = atan2( left[1], left[0] ) - \
				atan2( right[1], right[0] ); \
			double mod = hypot( left[1], left[0] ) / \
				hypot( right[1], right[0] ); \
			\
			q[0] = mod * cos( arg ); \
			q[1] = mod * sin( arg ); \
		} \
		\
		left += 2; \
		right += 2; \
		q += 2; \
	} \
}

#else /* USE_MODARG_DIV */

#define CLOOP( TYPE ) {                                     \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	TYPE * restrict q = (TYPE *) out; \
	int i; \
        \
	for( i = 0; i < sz; i++ ) { \
		if( right[0] == 0.0 && \
			right[1] == 0.0 ) { \
			q[0] = 0.0; \
			q[1] = 0.0; \
		} \
		else if( fabs( right[0] ) > fabs( right[1] ) ) { \
			double a = right[1] / right[0]; \
			double b = right[0] + right[1] * a; \
			\
			q[0] = (left[0] + left[1] * a) / b; \
			q[1] = (left[1] - left[0] * a) / b; \
		} \
		else { \
			double a = right[0] / right[1]; \
			double b = right[1] + right[0] * a; \
			\
			q[0] = (left[0] * a + left[1]) / b; \
			q[1] = (left[1] * a - left[0]) / b; \
		} \
		\
		left += 2; \
		right += 2; \
		q += 2; \
	} \
}

#endif /* USE_MODARG_DIV */

/* Real divide. Cast in to OUT before divide so we work for float output.
 */
#define RLOOP( 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] = right[x] == 0 ? q[x] : (OUT) left[x] / (OUT) right[x]; \
}

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

	int x;

	/* Keep types here in sync with bandfmt_divide[] 
	 * below.
         */
        switch( vips_image_get_format( im ) ) {
        case VIPS_FORMAT_CHAR: 	RLOOP( signed char, float ); break; <commit_msg>fix /0 bug<commit_after>/* Divide two images
 *
 * Copyright: 1990, <NAME>.
 *
 * Author: <NAME>
 * Written on: 02/05/1990
 * Modified on: 
 * 29/4/93 JC
 *	- now works for partial images
 * 1/7/93 JC
 *	- adapted for partial v2
 *	- ANSIfied
 * 19/10/93 JC
 *	- coredump-inducing bug in complex*complex fixed
 * 13/12/93
 *	- char*short bug fixed
 * 12/6/95 JC
 *	- new im_multiply adapted to make new im_divide
 * 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
 * 31/7/10
 * 	- remove liboil support
 * 	- avoid /0 
 * 6/11/11
 * 	- rewrite as a class 
 * 22/2/12
 * 	- avoid /0 for complex as well
 * 6/4/12
 * 	- fixed switch cases
 *	- fixed int operands with <1 result
 */

/*

    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 VipsDivide;
typedef VipsBinaryClass VipsDivideClass;

G_DEFINE_TYPE( VipsDivide, vips_divide, VIPS_TYPE_BINARY );

/* Complex divide.
 */
#ifdef USE_MODARG_DIV

/* This is going to be much slower */
#define CLOOP( TYPE ) { \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	TYPE * restrict q = (TYPE *) out; \
	int i; \
        \
	for( i = 0; i < sz; i++ ) { \
		if( right[0] == 0.0 && \
			right[1] == 0.0 ) { \
			q[0] = 0.0; \
			q[1] = 0.0; \
		} \
		else { \
			double arg = atan2( left[1], left[0] ) - \
				atan2( right[1], right[0] ); \
			double mod = hypot( left[1], left[0] ) / \
				hypot( right[1], right[0] ); \
			\
			q[0] = mod * cos( arg ); \
			q[1] = mod * sin( arg ); \
		} \
		\
		left += 2; \
		right += 2; \
		q += 2; \
	} \
}

#else /* USE_MODARG_DIV */

#define CLOOP( TYPE ) {                                     \
	TYPE * restrict left = (TYPE *) in[0]; \
	TYPE * restrict right = (TYPE *) in[1]; \
	TYPE * restrict q = (TYPE *) out; \
	int i; \
        \
	for( i = 0; i < sz; i++ ) { \
		if( right[0] == 0.0 && \
			right[1] == 0.0 ) { \
			q[0] = 0.0; \
			q[1] = 0.0; \
		} \
		else if( fabs( right[0] ) > fabs( right[1] ) ) { \
			double a = right[1] / right[0]; \
			double b = right[0] + right[1] * a; \
			\
			q[0] = (left[0] + left[1] * a) / b; \
			q[1] = (left[1] - left[0] * a) / b; \
		} \
		else { \
			double a = right[0] / right[1]; \
			double b = right[1] + right[0] * a; \
			\
			q[0] = (left[0] * a + left[1]) / b; \
			q[1] = (left[1] * a - left[0]) / b; \
		} \
		\
		left += 2; \
		right += 2; \
		q += 2; \
	} \
}

#endif /* USE_MODARG_DIV */

/* Real divide. Cast in to OUT before divide so we work for float output.
 */
#define RLOOP( 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] = right[x] == 0 ? 0 : (OUT) left[x] / (OUT) right[x]; \
}

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

	int x;

	/* Keep types here in sync with bandfmt_divide[] 
	 * below.
         */
        switch( vips_image_get_format( im ) ) {
        case VIPS_FORMAT_CHAR: 	RLOOP( signed char, float ); break; 
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