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split into switch/case

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A neater solution! In Python it should be something like:

merge = pyvips.Image.switch([tests]).case([cases])

and should be efficient
This commit is contained in:
John Cupitt 2019-08-17 14:51:55 +01:00
parent 45c847a96c
commit fc17a79767
8 changed files with 314 additions and 422 deletions
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2
libvips/conversion/Makefile.am
View File

@ -1,7 +1,7 @@
noinst_LTLIBRARIES = libconversion.la
libconversion_la_SOURCES = \
select.c \
switch.c \
transpose3d.c \
composite.cpp \
smartcrop.c \

2
libvips/conversion/conversion.c
View File

@ -383,6 +383,7 @@ vips_conversion_operation_init( void )
extern GType vips_rot45_get_type( void );
extern GType vips_autorot_get_type( void );
extern GType vips_ifthenelse_get_type( void );
extern GType vips_switch_get_type( void );
extern GType vips_recomb_get_type( void );
extern GType vips_bandmean_get_type( void );
extern GType vips_bandfold_get_type( void );
@ -434,6 +435,7 @@ vips_conversion_operation_init( void )
vips_rot45_get_type();
vips_autorot_get_type();
vips_ifthenelse_get_type();
vips_switch_get_type();
vips_recomb_get_type();
vips_bandmean_get_type();
vips_bandfold_get_type();

369
libvips/conversion/select.c
View File

@ -1,369 +0,0 @@
/* use pixel values to select between an array of images
*
* 28/7/19
* - from maplut.c
*/
/*
This file is part of VIPS.
VIPS 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 of the License, or
(at your option) any later version.
This program 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 program; 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vips/vips.h>
#include <vips/internal.h>
typedef struct _VipsSelect {
VipsOperation parent_instance;
VipsArrayImage *tests;
VipsArrayImage *cases;
VipsImage *out;
int n;
} VipsSelect;
typedef VipsOperationClass VipsSelectClass;
G_DEFINE_TYPE( VipsSelect, vips_select, VIPS_TYPE_OPERATION );
/* Our sequence value.
*/
typedef struct _VipsSelectSeq {
VipsSelect *select;
/* Set of input regions.
*/
VipsRegion **tests;
VipsRegion **cases;
} VipsSelectSeq;
int
vips_select_stop( void *vseq, void *a, void *b )
{
VipsSelectSeq *seq = (VipsSelectSeq *) vseq;
if( seq->tests ) {
vips_stop_many( (void *) seq->tests, NULL, NULL );
seq->tests = NULL;
}
if( seq->cases ) {
vips_stop_many( (void *) seq->cases, NULL, NULL );
seq->cases = NULL;
}
VIPS_FREE( seq );
return( 0 ):
}
static void *
vips_select_start( VipsImage *out, void *a, void *b )
{
VipsImage **in = (VipsImage **) a;
VipsSelect *select = (VipsSelect *) b;
VipsSelectSeq *seq;
int i, n;
if( !(seq = VIPS_NEW( NULL, VipsSelectSeq )) )
return( NULL );
seq->select = select;
seq->tests = NULL;
seq->cases = NULL;
seq->tests = vips_start_many( NULL, (void *) select->tests, NULL );
seq->cases = vips_start_many( NULL, (void *) select->cases, NULL );
if( !seq->tests ||
!seq->cases ) {
vips_select_stop( (void *) seq, NULL, NULL );
return( NULL );
}
return( seq );
}
/* Do a map.
*/
static int
vips_select_gen( VipsRegion *or, void *vseq, void *a, void *b,
gboolean *stop )
{
VipsSelectSeq *seq = (VipsSelectSeq *) vseq;
VipsSelect *select = seq->select;
VipsRect *r = &or->valid;
int x, y, i, j;
VipsPel * restrict ip;
VipsPel * restrict q;
size_t ils;
size_t qls;
int hist[256];
VipsPel * restrict p[256];
size_t ls[256];
size_t ps;
if( vips_region_prepare( index, r ) )
return( -1 );
g_assert( index->im->BandFmt == VIPS_FORMAT_UCHAR );
g_assert( index->im->Bands == 1 );
/* Histogram of input region, so we know which of our inputs we will
* need to prepare.
*/
memset( hist, 0, 256 * sizeof( int ) );
ip = VIPS_REGION_ADDR( index, r->left, r->top );
ils = VIPS_REGION_LSKIP( index );
for( y = 0; y < r->height; y++ ) {
for( x = 0; x < r->width; x++ )
hist[ip[x]] += 1;
ip += ils;
}
for( i = 0; i < 256; i++ )
if( hist[i] ) {
if( vips_region_prepare( ar[i], r ) )
return( -1 );
p[i] = VIPS_REGION_ADDR( ar[i], r->left, r->top );
ls[i] = VIPS_REGION_LSKIP( ar[i] );
}
ip = VIPS_REGION_ADDR( index, r->left, r->top );
q = VIPS_REGION_ADDR( or, r->left, r->top );
qls = VIPS_REGION_LSKIP( or );
ps = VIPS_IMAGE_SIZEOF_PEL( or->im );
for( y = 0; y < r->height; y++ ) {
i = 0;
for( x = 0; x < r->width; x++ ) {
VipsPel * restrict pv = p[ip[x]];
for( j = 0; j < ps; j++ ) {
q[i] = pv[i];
i += 1;
}
}
ip += ils;
q += qls;
for( i = 0; i < 256; i++ )
if( hist[i] )
p[i] += ls[i];
}
return( 0 );
}
static int
vips_select_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsSelect *swit = (VipsSelect *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
VipsImage *in;
VipsImage **lut;
VipsImage **decode;
VipsImage **format;
VipsImage **band;
VipsImage **size;
int i;
g_object_set( object, "out", vips_image_new(), NULL );
if( VIPS_OBJECT_CLASS( vips_select_parent_class )->build( object ) )
return( -1 );
in = swit->in;
lut = vips_area_get_data( &swit->lut->area,
NULL, &swit->n, NULL, NULL );
if( swit->n > 256 ) {
vips_error( class->nickname, "%s", _( "LUT too large" ) );
return( -1 );
}
if( in->Bands > 1 ) {
vips_error( class->nickname,
"%s", _( "index image not 1-band" ) );
return( -1 );
}
/* Cast @in to u8 to make the index image.
*/
if( vips_cast( in, &t[0], VIPS_FORMAT_UCHAR, NULL ) )
return( -1 );
in = t[0];
decode = (VipsImage **) vips_object_local_array( object, swit->n );
format = (VipsImage **) vips_object_local_array( object, swit->n );
band = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
size = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
/* Decode RAD/LABQ etc.
*/
for( i = 0; i < swit->n; i++ )
if( vips_image_decode( lut[i], &decode[i] ) )
return( -1 );
lut = decode;
/* LUT images must match in format, size and bands.
*
* We want everything sized up to the size of the index image, so add
* that to the end of the set of images for sizealike.
*/
band[swit->n] = in;
g_object_ref( in );
if( vips__formatalike_vec( lut, format, swit->n ) ||
vips__bandalike_vec( class->nickname,
format, band, swit->n, 1 ) ||
vips__sizealike_vec( band, size, swit->n + 1 ) )
return( -1 );
lut = size;
swit->out->BandFmt = lut[0]->BandFmt;
swit->out->Bands = lut[0]->Bands;
swit->out->Type = lut[0]->Type;
swit->out->Xsize = in->Xsize;
swit->out->Ysize = in->Ysize;
if( vips_image_pipeline_array( swit->out,
VIPS_DEMAND_STYLE_THINSTRIP, lut ) )
return( -1 );
if( vips_image_generate( swit->out,
vips_start_many, vips_select_gen, vips_stop_many,
lut, swit ) )
return( -1 );
return( 0 );
}
static void
vips_select_class_init( VipsSelectClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( class );
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "select";
object_class->description =
_( "test images pick pixels from a set of case images" );
object_class->build = vips_select_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_BOXED( class, "tests", 1,
_( "Tests" ),
_( "Table of images to test" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsSelect, tests ),
VIPS_TYPE_ARRAY_IMAGE );
VIPS_ARG_BOXED( class, "cases", 2,
_( "Cases" ),
_( "Table of image cases" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsSelect, cases ),
VIPS_TYPE_ARRAY_IMAGE );
VIPS_ARG_IMAGE( class, "out", 3,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsSelect, out ) );
}
static void
vips_select_init( VipsSelect *swit )
{
}
static int
vips_selectv( VipsImage **tests, VipsImage **cases, VipsImage **out, int n,
va_list ap )
{
VipsArrayImage *tests_array;
VipsArrayImage *cases_array;
int result;
tests_array = vips_array_image_new( tests n );
cases_array = vips_array_image_new( selects, n );
result = vips_call_split( "select", ap,
tests_array, cases_array, out );
vips_area_unref( VIPS_AREA( tests_array ) );
vips_area_unref( VIPS_AREA( cases_array ) );
return( result );
}
/**
* vips_select: (method)
* @tests: (array length=n): test these images
* @cases: (array length=n): to pick between these images
* @out: (out): output image
* @n: number of input images
* @...: %NULL-terminated list of optional named arguments
*
* The @tests images are evaluated and the index of the first non-zero value
* in @tests is used to pick a pixel from @cases. If all @tests are false, the
* pixel from the final image is @cases is used.
*
* Images in @tests images must have one uchar band. @cases and @tests can
* have up to 256 elements. The images in @tests and @cases
* must have either one band or the same number of bands. The output image is
* the same size as @tests. Images in @cases are expanded to the smallest
* common format and number of bands.
*
* See also: vips_maplut().
*
* Returns: 0 on success, -1 on error
*/
int
vips_select( VipsImage **tests, VipsImage **cases, VipsImage **out, int n, ... )
{
va_list ap;
int result;
va_start( ap, n );
result = vips_selectv( tests, cases, out, n, ap );
va_end( ap );
return( result );
}

257
libvips/conversion/switch.c Normal file
View File

@ -0,0 +1,257 @@
/* switch between an array of images
*
* 28/7/19
* - from maplut.c
*/
/*
This file is part of VIPS.
VIPS 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 of the License, or
(at your option) any later version.
This program 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 program; 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vips/vips.h>
#include <vips/internal.h>
typedef struct _VipsSwitch {
VipsOperation parent_instance;
VipsArrayImage *tests;
VipsImage *out;
int n;
} VipsSwitch;
typedef VipsOperationClass VipsSwitchClass;
G_DEFINE_TYPE( VipsSwitch, vips_switch, VIPS_TYPE_OPERATION );
static int
vips_switch_gen( VipsRegion *or, void *seq, void *a, void *b,
gboolean *stop )
{
VipsRegion **ar = (VipsRegion **) seq;
VipsSwitch *swit = (VipsSwitch *) b;
VipsRect *r = &or->valid;
int x, y, i;
VipsPel * restrict q;
size_t qls;
VipsPel * restrict p[256];
size_t ls[256];
if( vips_reorder_prepare_many( or->im, ar, r ) )
return( -1 );
g_assert( ar->im->BandFmt == VIPS_FORMAT_UCHAR );
g_assert( ar->im->Bands == 1 );
for( i = 0; i < swit->n; i++ ) {
p[i] = VIPS_REGION_ADDR( ar[i], r->left, r->top );
ls[i] = VIPS_REGION_LSKIP( ar[i] );
}
q = VIPS_REGION_ADDR( or, r->left, r->top );
qls = VIPS_REGION_LSKIP( or );
for( y = 0; y < r->height; y++ ) {
for( x = 0; x < r->width; x++ ) {
for( i = 0; i < swit->n; i++ )
if( p[i][x] )
break;
q[x] = i;
}
q += qls;
for( i = 0; i < swit->n; i++ )
p[i] += ls[i];
}
return( 0 );
}
static int
vips_switch_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsSwitch *swit = (VipsSwitch *) object;
VipsImage **tests;
VipsImage **decode;
VipsImage **format;
VipsImage **band;
VipsImage **size;
int i;
g_object_set( object, "out", vips_image_new(), NULL );
if( VIPS_OBJECT_CLASS( vips_switch_parent_class )->build( object ) )
return( -1 );
tests = vips_area_get_data( &swit->tests->area,
NULL, &swit->n, NULL, NULL );
if( swit->n > 255 ||
swit->n < 1 ) {
vips_error( class->nickname, "%s", _( "bad number of tests" ) );
return( -1 );
}
decode = (VipsImage **) vips_object_local_array( object, swit->n );
format = (VipsImage **) vips_object_local_array( object, swit->n );
band = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
size = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
/* Decode RAD/LABQ etc.
*/
for( i = 0; i < swit->n; i++ )
if( vips_image_decode( tests[i], &decode[i] ) )
return( -1 );
tests = decode;
/* Must be uchar.
*/
for( i = 0; i < swit->n; i++ )
if( vips_cast_uchar( tests[i], &format[i], NULL ) )
return( -1 );
tests = format;
/* Images must match in size and bands.
*/
if( vips__bandalike_vec( class->nickname, tests, band, swit->n, 1 ) ||
vips__sizealike_vec( band, size, swit->n + 1 ) )
return( -1 );
tests = size;
if( tests[0]->Bands > 1 ) {
vips_error( class->nickname,
"%s", _( "test images not 1-band" ) );
return( -1 );
}
if( vips_image_pipeline_array( swit->out,
VIPS_DEMAND_STYLE_THINSTRIP, tests ) )
return( -1 );
if( vips_image_generate( swit->out,
vips_start_many, vips_switch_gen, vips_stop_many,
tests, swit ) )
return( -1 );
return( 0 );
}
static void
vips_switch_class_init( VipsSwitchClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( class );
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "switch";
object_class->description =
_( "find the index of the first non-zero pixel in tests" );
object_class->build = vips_switch_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_BOXED( class, "tests", 1,
_( "Tests" ),
_( "Table of images to test" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsSwitch, tests ),
VIPS_TYPE_ARRAY_IMAGE );
VIPS_ARG_IMAGE( class, "out", 2,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsSwitch, out ) );
}
static void
vips_switch_init( VipsSwitch *swit )
{
}
static int
vips_switchv( VipsImage **tests, VipsImage **out, int n, va_list ap )
{
VipsArrayImage *tests_array;
int result;
tests_array = vips_array_image_new( tests, n );
result = vips_call_split( "switch", ap, tests_array, out );
vips_area_unref( VIPS_AREA( tests_array ) );
return( result );
}
/**
* vips_switch: (method)
* @tests: (array length=n): test these images
* @out: (out): output index image
* @n: number of input images
* @...: %NULL-terminated list of optional named arguments
*
* The @tests images are evaluated and at each point the index of the first
* non-zero value is written to @out. If all @tests are false, the value
* (@n + 1) is written.
*
* Images in @tests must have one band. They are expanded to the
* bounding box of the set of images in @tests, and that size is used for
* @out. @tests can have up to 255 elements.
*
* Combine with vips_case() to make an efficient multi-way vips_ifthenelse().
*
* See also: vips_maplut(), vips_case(), vips_ifthenelse().
*
* Returns: 0 on success, -1 on error
*/
int
vips_switch( VipsImage **tests, VipsImage **out, int n, ... )
{
va_list ap;
int result;
va_start( ap, n );
result = vips_switchv( tests, out, n, ap );
va_end( ap );
return( result );
}

2
libvips/histogram/Makefile.am
View File

@ -4,7 +4,7 @@ libhistogram_la_SOURCES = \
histogram.c \
phistogram.h \
maplut.c \
switch.c \
case.c \
hist_unary.c \
hist_unary.h \
hist_cum.c \

99
libvips/histogram/switch.c → libvips/histogram/case.c
View File

@ -1,4 +1,4 @@
/* use pixel values to switch between an array of images
/* use pixel values to pick cases from an array of images
*
* 28/7/19
* - from maplut.c
@ -43,7 +43,7 @@
#include <vips/vips.h>
#include <vips/internal.h>
typedef struct _VipsSwitch {
typedef struct _VipsCase {
VipsOperation parent_instance;
VipsImage *in;
@ -51,22 +51,22 @@ typedef struct _VipsSwitch {
VipsArrayImage *lut;
int n;
} VipsSwitch;
} VipsCase;
typedef VipsOperationClass VipsSwitchClass;
typedef VipsOperationClass VipsCaseClass;
G_DEFINE_TYPE( VipsSwitch, vips_switch, VIPS_TYPE_OPERATION );
G_DEFINE_TYPE( VipsCase, vips_case, VIPS_TYPE_OPERATION );
/* Do a map.
*/
static int
vips_switch_gen( VipsRegion *or, void *seq, void *a, void *b,
vips_case_gen( VipsRegion *or, void *seq, void *a, void *b,
gboolean *stop )
{
VipsRegion **ar = (VipsRegion **) seq;
VipsSwitch *swit = (VipsSwitch *) b;
VipsCase *cas = (VipsCase *) b;
VipsRect *r = &or->valid;
VipsRegion *index = ar[swit->n];
VipsRegion *index = ar[cas->n];
int x, y, i, j;
VipsPel * restrict ip;
@ -131,10 +131,10 @@ vips_switch_gen( VipsRegion *or, void *seq, void *a, void *b,
}
static int
vips_switch_build( VipsObject *object )
vips_case_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsSwitch *swit = (VipsSwitch *) object;
VipsCase *cas = (VipsCase *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
VipsImage *in;
@ -147,13 +147,13 @@ vips_switch_build( VipsObject *object )
g_object_set( object, "out", vips_image_new(), NULL );
if( VIPS_OBJECT_CLASS( vips_switch_parent_class )->build( object ) )
if( VIPS_OBJECT_CLASS( vips_case_parent_class )->build( object ) )
return( -1 );
in = swit->in;
lut = vips_area_get_data( &swit->lut->area,
NULL, &swit->n, NULL, NULL );
if( swit->n > 256 ) {
in = cas->in;
lut = vips_area_get_data( &cas->lut->area,
NULL, &cas->n, NULL, NULL );
if( cas->n > 256 ) {
vips_error( class->nickname, "%s", _( "LUT too large" ) );
return( -1 );
}
@ -169,14 +169,14 @@ vips_switch_build( VipsObject *object )
return( -1 );
in = t[0];
decode = (VipsImage **) vips_object_local_array( object, swit->n );
format = (VipsImage **) vips_object_local_array( object, swit->n );
band = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
size = (VipsImage **) vips_object_local_array( object, swit->n + 1 );
decode = (VipsImage **) vips_object_local_array( object, cas->n );
format = (VipsImage **) vips_object_local_array( object, cas->n );
band = (VipsImage **) vips_object_local_array( object, cas->n + 1 );
size = (VipsImage **) vips_object_local_array( object, cas->n + 1 );
/* Decode RAD/LABQ etc.
*/
for( i = 0; i < swit->n; i++ )
for( i = 0; i < cas->n; i++ )
if( vips_image_decode( lut[i], &decode[i] ) )
return( -1 );
lut = decode;
@ -186,35 +186,35 @@ vips_switch_build( VipsObject *object )
* We want everything sized up to the size of the index image, so add
* that to the end of the set of images for sizealike.
*/
band[swit->n] = in;
band[cas->n] = in;
g_object_ref( in );
if( vips__formatalike_vec( lut, format, swit->n ) ||
if( vips__formatalike_vec( lut, format, cas->n ) ||
vips__bandalike_vec( class->nickname,
format, band, swit->n, 1 ) ||
vips__sizealike_vec( band, size, swit->n + 1 ) )
format, band, cas->n, 1 ) ||
vips__sizealike_vec( band, size, cas->n + 1 ) )
return( -1 );
lut = size;
swit->out->BandFmt = lut[0]->BandFmt;
swit->out->Bands = lut[0]->Bands;
swit->out->Type = lut[0]->Type;
swit->out->Xsize = in->Xsize;
swit->out->Ysize = in->Ysize;
cas->out->BandFmt = lut[0]->BandFmt;
cas->out->Bands = lut[0]->Bands;
cas->out->Type = lut[0]->Type;
cas->out->Xsize = in->Xsize;
cas->out->Ysize = in->Ysize;
if( vips_image_pipeline_array( swit->out,
if( vips_image_pipeline_array( cas->out,
VIPS_DEMAND_STYLE_THINSTRIP, lut ) )
return( -1 );
if( vips_image_generate( swit->out,
vips_start_many, vips_switch_gen, vips_stop_many,
lut, swit ) )
if( vips_image_generate( cas->out,
vips_start_many, vips_case_gen, vips_stop_many,
lut, cas ) )
return( -1 );
return( 0 );
}
static void
vips_switch_class_init( VipsSwitchClass *class )
vips_case_class_init( VipsCaseClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( class );
@ -223,10 +223,10 @@ vips_switch_class_init( VipsSwitchClass *class )
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "switch";
object_class->nickname = "case";
object_class->description =
_( "use pixel values to switch between a set of images" );
object_class->build = vips_switch_build;
_( "use pixel values to case between a set of images" );
object_class->build = vips_case_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
@ -234,51 +234,51 @@ vips_switch_class_init( VipsSwitchClass *class )
_( "Input" ),
_( "Input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsSwitch, in ) );
G_STRUCT_OFFSET( VipsCase, in ) );
VIPS_ARG_IMAGE( class, "out", 2,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsSwitch, out ) );
G_STRUCT_OFFSET( VipsCase, out ) );
VIPS_ARG_BOXED( class, "lut", 3,
_( "LUT" ),
_( "Look-up table of images" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsSwitch, lut ),
G_STRUCT_OFFSET( VipsCase, lut ),
VIPS_TYPE_ARRAY_IMAGE );
}
static void
vips_switch_init( VipsSwitch *swit )
vips_case_init( VipsCase *cas )
{
}
static int
vips_switchv( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
vips_casev( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
va_list ap )
{
VipsArrayImage *array;
int result;
array = vips_array_image_new( lut, n );
result = vips_call_split( "switch", ap, in, out, array );
result = vips_call_split( "case", ap, in, out, array );
vips_area_unref( VIPS_AREA( array ) );
return( result );
}
/**
* vips_switch: (method)
* vips_case: (method)
* @in: input image
* @out: (out): output image
* @lut: (array length=n): LUT of input images
* @n: number of input images
* @...: %NULL-terminated list of optional named arguments
*
* Use pixel values to switch between an array of images.
* Use pixel values to pick cases from an array of images.
*
* Each value in @in is used to select an image from @lut, and the
* corresponding pixel is copied to the output.
@ -289,18 +289,21 @@ vips_switchv( VipsImage *in, VipsImage **out, VipsImage **lut, int n,
* the same size as @in. Images in @lut are expanded to the smallest common
* format and number of bands.
*
* See also: vips_maplut().
* Combine this with vips_switch() to make something like a case statement, or
* a multi-way vips_ifthenelse().
*
* See also: vips_maplut(), vips_switch(), vips_ifthenelse().
*
* Returns: 0 on success, -1 on error
*/
int
vips_switch( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
vips_case( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
{
va_list ap;
int result;
va_start( ap, n );
result = vips_switchv( in, out, lut, n, ap );
result = vips_casev( in, out, lut, n, ap );
va_end( ap );
return( result );

3
libvips/include/vips/conversion.h
View File

@ -262,8 +262,7 @@ int vips_recomb( VipsImage *in, VipsImage **out, VipsImage *m, ... )
int vips_ifthenelse( VipsImage *cond, VipsImage *in1, VipsImage *in2,
VipsImage **out, ... )
__attribute__((sentinel));
int vips_select( VipsImage **tests, VipsImage **cases,
VipsImage **out, int n, ... )
int vips_switch( VipsImage **tests, VipsImage **out, int n, ... )
__attribute__((sentinel));
int vips_flatten( VipsImage *in, VipsImage **out, ... )

2
libvips/include/vips/histogram.h
View File

@ -64,7 +64,7 @@ int vips_hist_ismonotonic( VipsImage *in, gboolean *out, ... )
int vips_hist_entropy( VipsImage *in, double *out, ... )
__attribute__((sentinel));
int vips_switch( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
int vips_case( VipsImage *in, VipsImage **out, VipsImage **lut, int n, ... )
__attribute__((sentinel));
#ifdef __cplusplus