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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 <glib/gi18n-lib.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: (method)
* @in: input image
* @out: (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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