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libvips/libvips/conversion/join.c

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/* join left-right and up-down
*
* Copyright 1990, 1991: Kirk Martinez, N. Dessipris
* Author: Kirk Martinez, N. Dessipris
* Written on: 9/6/90
* Modified on: 17/04/1991
* 31/8/93 JC
* - args to memcpy() were reversed
* 14/11/94 JC
* - tided up and ANSIfied
* - now accepts IM_CODING_LABQ
* - memory leaks removed
* - bug in calculation of output Xsize removed (thanks Thomson!)
* - bug in checking of image compatibility fixed
* 23/10/95 JC
* - rewritten in terms of im_insert()
* 14/4/04
* - sets Xoffset / Yoffset
* 1/2/10
* - gtkdoc
* - cleanups
* 19/10/11
* - redone as a class
* 25/8/17
* - tag as sequential
*/
/*
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
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#include "pconversion.h"
typedef struct _VipsJoin {
VipsConversion parent_instance;
/* Params.
*/
VipsImage *in1;
VipsImage *in2;
VipsDirection direction;
gboolean expand;
int shim;
VipsArea *background;
VipsAlign align;
} VipsJoin;
typedef VipsConversionClass VipsJoinClass;
G_DEFINE_TYPE( VipsJoin, vips_join, VIPS_TYPE_CONVERSION );
static int
vips_join_build( VipsObject *object )
{
VipsConversion *conversion = VIPS_CONVERSION( object );
VipsJoin *join = (VipsJoin *) object;
int x, y;
VipsImage *t;
if( VIPS_OBJECT_CLASS( vips_join_parent_class )->build( object ) )
return( -1 );
/* Stop compiler warnings.
*/
x = 0;
y = 0;
switch( join->direction ) {
case VIPS_DIRECTION_HORIZONTAL:
x = join->in1->Xsize + join->shim;
switch( join->align ) {
case VIPS_ALIGN_LOW:
y = 0;
break;
case VIPS_ALIGN_CENTRE:
y = join->in1->Ysize / 2 - join->in2->Ysize / 2;
break;
case VIPS_ALIGN_HIGH:
y = join->in1->Ysize - join->in2->Ysize;
break;
default:
g_assert_not_reached();
}
break;
case VIPS_DIRECTION_VERTICAL:
y = join->in1->Ysize + join->shim;
switch( join->align ) {
case VIPS_ALIGN_LOW:
x = 0;
break;
case VIPS_ALIGN_CENTRE:
x = join->in1->Xsize / 2 - join->in2->Xsize / 2;
break;
case VIPS_ALIGN_HIGH:
x = join->in1->Xsize - join->in2->Xsize;
break;
default:
g_assert_not_reached();
}
break;
default:
g_assert_not_reached();
}
if( vips_insert( join->in1, join->in2, &t, x, y,
"expand", TRUE,
"background", join->background,
NULL ) )
return( -1 );
if( !join->expand ) {
VipsImage *t2;
int left, top, width, height;
switch( join->direction ) {
case VIPS_DIRECTION_HORIZONTAL:
left = 0;
top = VIPS_MAX( 0, y ) - y;
width = t->Xsize;
height = VIPS_MIN( join->in1->Ysize, join->in2->Ysize );
break;
case VIPS_DIRECTION_VERTICAL:
left = VIPS_MAX( 0, x ) - x;
top = 0;
width = VIPS_MIN( join->in1->Xsize, join->in2->Xsize );
height = t->Ysize;
break;
default:
g_assert_not_reached();
/* Stop compiler warnings.
*/
left = 0;
top = 0;
width = 0;
height = 0;
}
if( left != 0 ||
top != 0 ||
width != t->Xsize ||
height != t->Ysize ) {
if( vips_extract_area( t, &t2,
left, top, width, height, NULL ) ) {
g_object_unref( t );
return( -1 );
}
g_object_unref( t );
t = t2;
}
}
if( vips_image_write( t, conversion->out ) ) {
g_object_unref( t );
return( -1 );
}
g_object_unref( t );
return( 0 );
}
static void
vips_join_class_init( VipsJoinClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
VIPS_DEBUG_MSG( "vips_join_class_init\n" );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "join";
vobject_class->description = _( "join a pair of images" );
vobject_class->build = vips_join_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_IMAGE( class, "in1", 0,
_( "in1" ),
_( "First input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsJoin, in1 ) );
VIPS_ARG_IMAGE( class, "in2", 1,
_( "in2" ),
_( "Second input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsJoin, in2 ) );
VIPS_ARG_ENUM( class, "direction", 3,
_( "Direction" ),
_( "Join left-right or up-down" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsJoin, direction ),
VIPS_TYPE_DIRECTION, VIPS_DIRECTION_HORIZONTAL );
VIPS_ARG_BOOL( class, "expand", 4,
_( "Expand" ),
_( "Expand output to hold all of both inputs" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsJoin, expand ),
FALSE );
VIPS_ARG_INT( class, "shim", 5,
_( "Shim" ),
_( "Pixels between images" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsJoin, shim ),
0, 1000000, 0 );
VIPS_ARG_BOXED( class, "background", 6,
_( "Background" ),
_( "Colour for new pixels" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsJoin, background ),
VIPS_TYPE_ARRAY_DOUBLE );
VIPS_ARG_ENUM( class, "align", 7,
_( "Align" ),
_( "Align on the low, centre or high coordinate edge" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsJoin, align ),
VIPS_TYPE_ALIGN, VIPS_ALIGN_LOW );
}
static void
vips_join_init( VipsJoin *join )
{
/* Init our instance fields.
*/
join->background =
vips_area_new_array( G_TYPE_DOUBLE, sizeof( double ), 1 );
((double *) (join->background->data))[0] = 0.0;
}
/**
* vips_join:
* @in1: first input image
* @in2: second input image
* @out: (out): output image
* @direction: join horizontally or vertically
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @expand: %TRUE to expand the output image to hold all of the input pixels
* * @shim: space between images, in pixels
* * @background: background ink colour
* * @align: low, centre or high alignment
*
* Join @in1 and @in2 together, left-right or up-down depending on the value
* of @direction.
*
* If one is taller or wider than the
* other, @out will be has high as the smaller. If @expand is %TRUE, then
* the output will be expanded to contain all of the input pixels.
*
* Use @align to set the edge that the images align on. By default, they align
* on the edge with the lower value coordinate.
*
* Use @background to set the colour of any pixels in @out which are not
* present in either @in1 or @in2.
*
* Use @shim to set the spacing between the images. By default this is 0.
*
* 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 type (see table
* Smallest common format in
* <link linkend="libvips-arithmetic">arithmetic</link>).
*
* If you are going to be joining many thousands of images in a regular
* grid, vips_arrayjoin() is a better choice.
*
* See also: vips_arrayjoin(), vips_insert().
*
* Returns: 0 on success, -1 on error
*/
int
vips_join( VipsImage *in1, VipsImage *in2, VipsImage **out,
VipsDirection direction, ... )
{
va_list ap;
int result;
va_start( ap, direction );
result = vips_call_split( "join", ap, in1, in2, out, direction );
va_end( ap );
return( result );
}
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