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/* im_wrap
*
* Copyright: 2008, Nottingham Trent University
* Author: Tom Vajzovic
* Written on: 2008-01-15
* 2/2/10
* - rewritten in terms of im_replicate()/im_extract_area()
* - gtkdoc
* - allows any x/y
* 31/5/13
* - redone as a class
* - added rotquad behaviour if x/y not set
*/
/*
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 <vips/vips.h>
#include "pconversion.h"
typedef struct _VipsWrap {
VipsConversion parent_instance;
VipsImage *in;
int x;
int y;
} VipsWrap;
typedef VipsConversionClass VipsWrapClass;
G_DEFINE_TYPE( VipsWrap, vips_wrap, VIPS_TYPE_CONVERSION );
static int
vips_wrap_build( VipsObject *object )
{
VipsConversion *conversion = VIPS_CONVERSION( object );
VipsWrap *wrap = (VipsWrap *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 7 );
int x;
int y;
if( VIPS_OBJECT_CLASS( vips_wrap_parent_class )->build( object ) )
return( -1 );
if( !vips_object_argument_isset( object, "x" ) )
wrap->x = wrap->in->Xsize / 2;
if( !vips_object_argument_isset( object, "y" ) )
wrap->y = wrap->in->Ysize / 2;
/* Clock arithmetic: we want negative x/y to wrap around
* nicely.
*/
x = wrap->x < 0 ?
-wrap->x % wrap->in->Xsize :
wrap->in->Xsize - wrap->x % wrap->in->Xsize;
y = wrap->y < 0 ?
-wrap->y % wrap->in->Ysize :
wrap->in->Ysize - wrap->y % wrap->in->Ysize;
if( vips_replicate( wrap->in, &t[0], 2, 2, NULL ) ||
vips_extract_area( t[0], &t[1],
x, y, wrap->in->Xsize, wrap->in->Ysize, NULL ) ||
vips_image_write( t[1], conversion->out ) )
return( -1 );
conversion->out->Xoffset = x;
conversion->out->Yoffset = y;
return( 0 );
}
static void
vips_wrap_class_init( VipsWrapClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "wrap";
vobject_class->description = _( "wrap image origin" );
vobject_class->build = vips_wrap_build;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsWrap, in ) );
VIPS_ARG_INT( class, "x", 3,
_( "x" ),
_( "Left edge of input in output" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsWrap, x ),
-VIPS_MAX_COORD, VIPS_MAX_COORD, 0 );
VIPS_ARG_INT( class, "y", 4,
_( "y" ),
_( "Top edge of input in output" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsWrap, y ),
-VIPS_MAX_COORD, VIPS_MAX_COORD, 0 );
}
static void
vips_wrap_init( VipsWrap *wrap )
{
}
/**
* vips_wrap:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @x: horizontal displacement
* * @y: vertical displacement
*
* Slice an image up and move the segments about so that the pixel that was
* at 0, 0 is now at @x, @y. If @x and @y are not set, they default to the
* centre of the image.
*
* See also: vips_embed(), vips_replicate().
*
* Returns: 0 on success, -1 on error
*/
int
vips_wrap( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "wrap", ap, in, out );
va_end( ap );
return( result );
}
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