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libvips/libvips/arithmetic/complex.c

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/* complex.c ... various complex operations
*
* Copyright: 1990, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 12/02/1990
* Modified on : 09/05/1990
* 15/6/93 JC
* - stupid stupid includes and externs fixed
* - I have been editing for 1 1/2 hours and I'm still drowning in
* rubbish extetrnshh
* 13/12/94 JC
* - modernised
* 9/7/02 JC
* - degree output, for consistency
* - slightly better behaviour in edge cases
* 27/1/10
* - modernised
* - gtk-doc
* 19/11/11
* - redo as a class
* 21/11/11
* - add vips_complexget()
* 29/9/15
* - return 0 for cross-product where one arg is zero
*/
/*
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 <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "unary.h"
#include "binary.h"
typedef struct _VipsComplex {
VipsUnary parent_instance;
VipsOperationComplex cmplx;
} VipsComplex;
typedef VipsUnaryClass VipsComplexClass;
G_DEFINE_TYPE( VipsComplex, vips_complex, VIPS_TYPE_UNARY );
#define LOOP( IN, OUT, OP ) { \
IN * restrict p = (IN *) in[0]; \
OUT * restrict q = (OUT *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q, p[x], 0.0 ); \
\
q += 2; \
} \
}
#define CLOOP( IN, OUT, OP ) { \
IN * restrict p = (IN *) in[0]; \
OUT * restrict q = (OUT *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q, p[0], p[1] ); \
\
p += 2; \
q += 2; \
} \
}
#define SWITCH( OP ) \
switch( vips_image_get_format( im ) ) { \
case VIPS_FORMAT_UCHAR: \
LOOP( unsigned char, float, OP ); break; \
case VIPS_FORMAT_CHAR: \
LOOP( signed char, float, OP ); break; \
case VIPS_FORMAT_USHORT: \
LOOP( unsigned short, float, OP ); break; \
case VIPS_FORMAT_SHORT: \
LOOP( signed short, float, OP ); break; \
case VIPS_FORMAT_UINT: \
LOOP( unsigned int, float, OP ); break; \
case VIPS_FORMAT_INT: \
LOOP( signed int, float, OP ); break; \
case VIPS_FORMAT_FLOAT: \
LOOP( float, float, OP ); break; \
case VIPS_FORMAT_DOUBLE: \
LOOP( double, double, OP ); break;\
case VIPS_FORMAT_COMPLEX: \
CLOOP( float, float, OP ); break; \
case VIPS_FORMAT_DPCOMPLEX: \
CLOOP( double, double, OP ); break;\
\
default: \
g_assert_not_reached(); \
}
static double
vips_complex_hypot( double a, double b )
{
double d;
/* hypot() is less sensitive to overflow. Use it if we can.
*/
#ifdef HAVE_HYPOT
d = hypot( a, b );
#else
d = sqrt( a * a + b * b );
#endif
return( d );
}
static double
vips_complex_atan2( double a, double b )
{
double h;
/* atan2() is very slow, but is better behaved when a is near 0. Use
* it in preference when we can.
*/
#ifdef HAVE_ATAN2
h = VIPS_DEG( atan2( b, a ) );
if( h < 0.0 )
h += 360;
#else
h = vips_col_ab2h( a, b );
#endif
return( h );
}
#define POLAR( Q, X, Y ) { \
double re = (X); \
double im = (Y); \
double am, ph; \
\
am = vips_complex_hypot( re, im ); \
ph = vips_complex_atan2( re, im ); \
\
Q[0] = am; \
Q[1] = ph; \
}
#define RECT( Q, X, Y ) { \
double am = (X); \
double ph = (Y); \
double re, im; \
\
re = am * cos( VIPS_RAD( ph ) ); \
im = am * sin( VIPS_RAD( ph ) ); \
\
Q[0] = re; \
Q[1] = im; \
}
#define CONJ( Q, X, Y ) { \
double re = (X); \
double im = (Y); \
\
im *= -1; \
\
Q[0] = re; \
Q[1] = im; \
}
static void
vips_complex_buffer( VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width )
{
VipsComplex *cmplx = (VipsComplex *) arithmetic;
VipsImage *im = arithmetic->ready[0];
const int sz = width * vips_image_get_bands( im );
int x;
switch( cmplx->cmplx ) {
case VIPS_OPERATION_COMPLEX_POLAR: SWITCH( POLAR ); break;
case VIPS_OPERATION_COMPLEX_RECT: SWITCH( RECT ); break;
case VIPS_OPERATION_COMPLEX_CONJ: SWITCH( CONJ ); 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
static const VipsBandFormat vips_complex_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ X, X, X, X, X, X, X, X, DX, DX
};
static void
vips_complex_class_init( VipsComplexClass *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 = "complex";
object_class->description =
_( "perform a complex operation on an image" );
aclass->process_line = vips_complex_buffer;
vips_arithmetic_set_format_table( aclass, vips_complex_format_table );
VIPS_ARG_ENUM( class, "cmplx", 200,
_( "Operation" ),
_( "Complex to perform" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsComplex, cmplx ),
VIPS_TYPE_OPERATION_COMPLEX, VIPS_OPERATION_COMPLEX_POLAR );
}
static void
vips_complex_init( VipsComplex *cmplx )
{
}
static int
vips_complexv( VipsImage *in, VipsImage **out,
VipsOperationComplex cmplx, va_list ap )
{
return( vips_call_split( "complex", ap, in, out, cmplx ) );
}
/**
* vips_complex: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @cmplx: complex operation to perform
* @...: %NULL-terminated list of optional named arguments
*
* Perform various operations on complex images.
*
* Angles are expressed in degrees. The output type is complex unless the
* input is double or dpcomplex, in which case the output is dpcomplex.
*
* Returns: 0 on success, -1 on error
*/
int
vips_complex( VipsImage *in, VipsImage **out, VipsOperationComplex cmplx, ... )
{
va_list ap;
int result;
va_start( ap, cmplx );
result = vips_complexv( in, out, cmplx, ap );
va_end( ap );
return( result );
}
/**
* vips_polar: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEX_POLAR on an image. See vips_complex().
*
* Returns: 0 on success, -1 on error
*/
int
vips_polar( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complexv( in, out, VIPS_OPERATION_COMPLEX_POLAR, ap );
va_end( ap );
return( result );
}
/**
* vips_rect: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEX_RECT on an image. See vips_complex().
*
* Returns: 0 on success, -1 on error
*/
int
vips_rect( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complexv( in, out, VIPS_OPERATION_COMPLEX_RECT, ap );
va_end( ap );
return( result );
}
/**
* vips_conj: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEX_CONJ on an image. See vips_complex().
*
* Returns: 0 on success, -1 on error
*/
int
vips_conj( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complexv( in, out, VIPS_OPERATION_COMPLEX_CONJ, ap );
va_end( ap );
return( result );
}
typedef struct _VipsComplex2 {
VipsBinary parent_instance;
VipsOperationComplex2 cmplx;
} VipsComplex2;
typedef VipsBinaryClass VipsComplex2Class;
G_DEFINE_TYPE( VipsComplex2, vips_complex2, VIPS_TYPE_BINARY );
#define LOOP2( IN, OUT, OP ) { \
IN *p1 = (IN *) in[0]; \
IN *p2 = (IN *) in[1]; \
OUT *q = (OUT *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q, p1[x], 0.0, p2[x], 0.0 ); \
\
q += 2; \
} \
}
#define CLOOP2( IN, OUT, OP ) { \
IN *p1 = (IN *) in[0]; \
IN *p2 = (IN *) in[1]; \
OUT *q = (OUT *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q, p1[0], p1[1], p2[0], p2[1] ); \
\
p1 += 2; \
p2 += 2; \
q += 2; \
} \
}
#define SWITCH2( OP ) \
switch( vips_image_get_format( im ) ) { \
case VIPS_FORMAT_UCHAR: \
LOOP2( unsigned char, float, OP ); break; \
case VIPS_FORMAT_CHAR: \
LOOP2( signed char, float, OP ); break; \
case VIPS_FORMAT_USHORT: \
LOOP2( unsigned short, float, OP ); break; \
case VIPS_FORMAT_SHORT: \
LOOP2( signed short, float, OP ); break; \
case VIPS_FORMAT_UINT: \
LOOP2( unsigned int, float, OP ); break; \
case VIPS_FORMAT_INT: \
LOOP2( signed int, float, OP ); break; \
case VIPS_FORMAT_FLOAT: \
LOOP2( float, float, OP ); break; \
case VIPS_FORMAT_DOUBLE: \
LOOP2( double, double, OP ); break;\
case VIPS_FORMAT_COMPLEX: \
CLOOP2( float, float, OP ); break; \
case VIPS_FORMAT_DPCOMPLEX: \
CLOOP2( double, double, OP ); break;\
\
default: \
g_assert_not_reached(); \
}
/* There doesn't seem to be much difference in speed between these two methods
* (on an Athlon64), so I use the modulus argument version, since atan2() is
* in c89 but hypot() is c99.
*
* If you think that it might be faster on your platform, uncomment the
* following:
*/
#define USE_MODARG_DIV
#ifdef USE_MODARG_DIV
#define CROSS( Q, X1, Y1, X2, Y2 ) { \
if( ((X1) == 0.0 && (Y1) == 0.0) || \
((X2) == 0.0 && (Y2) == 0.0) ) { \
Q[0] = 0.0; \
Q[1] = 0.0; \
} \
else { \
double arg = atan2( X2, X1 ) - atan2( Y2, Y1 ); \
\
Q[0] = cos( arg ); \
Q[1] = sin( arg ); \
} \
}
#else /* USE_MODARG_DIV */
#define CROSS( Q, X1, Y1, X2, Y2 ) { \
if( ((X1) == 0.0 && (Y1) == 0.0) || \
((X2) == 0.0 && (Y2) == 0.0) ) { \
Q[0] = 0.0; \
Q[1] = 0.0; \
} \
else if( ABS( Y1 ) > ABS( Y2 ) ) { \
double a = Y2 / Y1; \
double b = Y1 + Y2 * a; \
double re = (X1 + X2 * a) / b; \
double im = (X2 - X1 * a) / b; \
double mod = vips__hypot( re, im ); \
\
Q[0] = re / mod; \
Q[1] = im / mod; \
} \
else { \
double a = Y1 / Y2; \
double b = Y2 + Y1 * a; \
double re = (X1 * a + X2) / b; \
double im = (X2 * a - X1) / b; \
double mod = vips__hypot( re, im ); \
\
Q[0] = re / mod; \
Q[1] = im / mod; \
} \
}
#endif /* USE_MODARG_DIV */
static void
vips_complex2_buffer( VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width )
{
VipsComplex2 *cmplx = (VipsComplex2 *) arithmetic;
VipsImage *im = arithmetic->ready[0];
const int sz = width * vips_image_get_bands( im );
int x;
switch( cmplx->cmplx ) {
case VIPS_OPERATION_COMPLEX2_CROSS_PHASE:
SWITCH2( CROSS );
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
static const VipsBandFormat vips_complex2_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ X, X, X, X, X, X, X, X, DX, DX
};
static void
vips_complex2_class_init( VipsComplex2Class *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 = "complex2";
object_class->description =
_( "complex binary operations on two images" );
aclass->process_line = vips_complex2_buffer;
vips_arithmetic_set_format_table( aclass, vips_complex2_format_table );
VIPS_ARG_ENUM( class, "cmplx", 200,
_( "Operation" ),
_( "Binary complex operation to perform" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsComplex2, cmplx ),
VIPS_TYPE_OPERATION_COMPLEX2,
VIPS_OPERATION_COMPLEX2_CROSS_PHASE );
}
static void
vips_complex2_init( VipsComplex2 *cmplx )
{
}
static int
vips_complex2v( VipsImage *left, VipsImage *right, VipsImage **out,
VipsOperationComplex2 cmplx, va_list ap )
{
return( vips_call_split( "complex2", ap, left, right, out, cmplx ) );
}
/**
* vips_complex2:
* @left: input #VipsImage
* @right: input #VipsImage
* @out: (out): output #VipsImage
* @cmplx: complex2 operation to perform
* @...: %NULL-terminated list of optional named arguments
*
* Perform various binary operations on complex images.
*
* Angles are expressed in degrees. The output type is complex unless the
* input is double or dpcomplex, in which case the output is dpcomplex.
*
* Returns: 0 on success, -1 on error
*/
int
vips_complex2( VipsImage *left, VipsImage *right, VipsImage **out,
VipsOperationComplex2 cmplx, ... )
{
va_list ap;
int result;
va_start( ap, cmplx );
result = vips_complex2v( left, right, out, cmplx, ap );
va_end( ap );
return( result );
}
/**
* vips_cross_phase:
* @left: input #VipsImage
* @right: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEX2_CROSS_PHASE on an image.
* See vips_complex2().
*
* Returns: 0 on success, -1 on error
*/
int
vips_cross_phase( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complex2v( left, right, out,
VIPS_OPERATION_COMPLEX2_CROSS_PHASE, ap );
va_end( ap );
return( result );
}
typedef struct _VipsComplexget {
VipsUnary parent_instance;
VipsOperationComplexget get;
} VipsComplexget;
typedef VipsUnaryClass VipsComplexgetClass;
G_DEFINE_TYPE( VipsComplexget, vips_complexget, VIPS_TYPE_UNARY );
static int
vips_complexget_build( VipsObject *object )
{
VipsUnary *unary = (VipsUnary *) object;
VipsComplexget *complexget = (VipsComplexget *) object;
if( unary->in &&
!vips_band_format_iscomplex( unary->in->BandFmt ) &&
complexget->get == VIPS_OPERATION_COMPLEXGET_REAL )
return( vips_unary_copy( unary ) );
if( VIPS_OBJECT_CLASS( vips_complexget_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
#define GETLOOP( TYPE, OP ) { \
TYPE *p G_GNUC_UNUSED = (TYPE *) in[0]; \
TYPE *q = (TYPE *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q[x], p[x], 0.0 ); \
} \
}
#define CGETLOOP( TYPE, OP ) { \
TYPE *p G_GNUC_UNUSED = (TYPE *) in[0]; \
TYPE *q = (TYPE *) out; \
\
for( x = 0; x < sz; x++ ) { \
OP( q[x], p[0], p[1] ); \
\
p += 2; \
} \
}
#define GETSWITCH( OP ) \
switch( vips_image_get_format( im ) ) { \
case VIPS_FORMAT_UCHAR: \
GETLOOP( unsigned char, OP ); break; \
case VIPS_FORMAT_CHAR: \
GETLOOP( signed char, OP ); break; \
case VIPS_FORMAT_USHORT: \
GETLOOP( unsigned short, OP ); break; \
case VIPS_FORMAT_SHORT: \
GETLOOP( signed short, OP ); break; \
case VIPS_FORMAT_UINT: \
GETLOOP( unsigned int, OP ); break; \
case VIPS_FORMAT_INT: \
GETLOOP( signed int, OP ); break; \
case VIPS_FORMAT_FLOAT: \
GETLOOP( float, OP ); break; \
case VIPS_FORMAT_DOUBLE: \
GETLOOP( double, OP ); break;\
case VIPS_FORMAT_COMPLEX: \
CGETLOOP( float, OP ); break; \
case VIPS_FORMAT_DPCOMPLEX: \
CGETLOOP( double, OP ); break;\
\
default: \
g_assert_not_reached(); \
}
#define REAL( Q, X, Y ) { \
Q = X; \
}
#define IMAG( Q, X, Y ) { \
Q = Y; \
}
static void
vips_complexget_buffer( VipsArithmetic *arithmetic,
VipsPel *out, VipsPel **in, int width )
{
VipsComplexget *complexget = (VipsComplexget *) arithmetic;
VipsImage *im = arithmetic->ready[0];
const int sz = width * vips_image_get_bands( im );
int x;
switch( complexget->get ) {
case VIPS_OPERATION_COMPLEXGET_REAL: GETSWITCH( REAL ); break;
case VIPS_OPERATION_COMPLEXGET_IMAG: GETSWITCH( IMAG ); 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
static const VipsBandFormat vips_complexget_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ UC, C, US, S, UI, I, F, F, D, D
};
static void
vips_complexget_class_init( VipsComplexgetClass *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 = "complexget";
object_class->description = _( "get a component from a complex image" );
object_class->build = vips_complexget_build;
aclass->process_line = vips_complexget_buffer;
vips_arithmetic_set_format_table( aclass,
vips_complexget_format_table );
VIPS_ARG_ENUM( class, "get", 200,
_( "Operation" ),
_( "Complex to perform" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsComplexget, get ),
VIPS_TYPE_OPERATION_COMPLEXGET,
VIPS_OPERATION_COMPLEXGET_REAL );
}
static void
vips_complexget_init( VipsComplexget *complexget )
{
}
static int
vips_complexgetv( VipsImage *in, VipsImage **out,
VipsOperationComplexget get, va_list ap )
{
return( vips_call_split( "complexget", ap, in, out, get ) );
}
/**
* vips_complexget: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @get: complex operation to perform
* @...: %NULL-terminated list of optional named arguments
*
* Get components of complex images.
*
* The output type is the same as the input type, except #VIPS_FORMAT_COMPLEX
* becomes #VIPS_FORMAT_FLOAT and #VIPS_FORMAT_DPCOMPLEX becomes
* #VIPS_FORMAT_DOUBLE.
*
* Returns: 0 on success, -1 on error
*/
int
vips_complexget( VipsImage *in, VipsImage **out,
VipsOperationComplexget get, ... )
{
va_list ap;
int result;
va_start( ap, get );
result = vips_complexgetv( in, out, get, ap );
va_end( ap );
return( result );
}
/**
* vips_real: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEXGET_REAL on an image. See vips_complexget().
*
* Returns: 0 on success, -1 on error
*/
int
vips_real( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complexgetv( in, out,
VIPS_OPERATION_COMPLEXGET_REAL, ap );
va_end( ap );
return( result );
}
/**
* vips_imag: (method)
* @in: input #VipsImage
* @out: (out): output #VipsImage
* @...: %NULL-terminated list of optional named arguments
*
* Perform #VIPS_OPERATION_COMPLEXGET_IMAG on an image. See vips_complexget().
*
* Returns: 0 on success, -1 on error
*/
int
vips_imag( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_complexgetv( in, out,
VIPS_OPERATION_COMPLEXGET_IMAG, ap );
va_end( ap );
return( result );
}
typedef VipsBinary VipsComplexform;
typedef VipsBinaryClass VipsComplexformClass;
G_DEFINE_TYPE( VipsComplexform, vips_complexform, VIPS_TYPE_BINARY );
static int
vips_complexform_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_complexform_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
#define CFORM( IN, OUT ) { \
IN *left = (IN *) in[0]; \
IN *right = (IN *) in[1]; \
OUT *q = (OUT *) out; \
\
for( x = 0; x < sz; x++ ) { \
q[0] = left[x]; \
q[1] = right[x]; \
\
q += 2; \
} \
}
static void
vips_complexform_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_complexform[]
* below.
*/
switch( vips_image_get_format( im ) ) {
case VIPS_FORMAT_UCHAR:
CFORM( unsigned char, float ); break;
case VIPS_FORMAT_CHAR:
CFORM( signed char, float ); break;
case VIPS_FORMAT_USHORT:
CFORM( unsigned short, float ); break;
case VIPS_FORMAT_SHORT:
CFORM( signed short, float ); break;
case VIPS_FORMAT_UINT:
CFORM( unsigned int, float ); break;
case VIPS_FORMAT_INT:
CFORM( signed int, float ); break;
case VIPS_FORMAT_FLOAT:
CFORM( float, float ); break;
case VIPS_FORMAT_DOUBLE:
CFORM( 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 form complex. Sign and value preserving. Make sure
* these match the case statement in complexform_buffer() above.
*/
static VipsBandFormat vips_complexform_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ X, X, X, X, X, X, X, X, DX, DX
};
static void
vips_complexform_class_init( VipsComplexformClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
object_class->nickname = "complexform";
object_class->description =
_( "form a complex image from two real images" );
object_class->build = vips_complexform_build;
aclass->process_line = vips_complexform_buffer;
vips_arithmetic_set_format_table( aclass,
vips_complexform_format_table );
}
static void
vips_complexform_init( VipsComplexform *complexform )
{
}
/**
* vips_complexform:
* @left: input image
* @right: input image
* @out: (out): output image
* @...: %NULL-terminated list of optional named arguments
*
* Compose two real images to make a complex image. If either @left or @right
* are #VIPS_FORMAT_DOUBLE, @out is #VIPS_FORMAT_DPCOMPLEX. Otherwise @out
* is #VIPS_FORMAT_COMPLEX. @left becomes the real component of @out and
* @right the imaginary.
*
* 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.
*
* See also: vips_complexget().
*
* Returns: 0 on success, -1 on error
*/
int
vips_complexform( VipsImage *left, VipsImage *right, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "complexform", ap, left, right, out );
va_end( ap );
return( result );
}
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