80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* 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
|
|
*/
|
|
|
|
/*
|
|
|
|
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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>
|
|
|
|
/**
|
|
* im_wrap:
|
|
* @in: input image
|
|
* @out: output image
|
|
* @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.
|
|
*
|
|
* See also: im_embed(), im_replicate(), im_rotquad().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
im_wrap( IMAGE *in, IMAGE *out, int x, int y )
|
|
{
|
|
IMAGE *t;
|
|
|
|
/* Clock arithmetic: we want negative x/y to wrap around
|
|
* nicely.
|
|
*/
|
|
x = x < 0 ? -x % in->Xsize : in->Xsize - x % in->Xsize;
|
|
y = y < 0 ? -y % in->Ysize : in->Ysize - y % in->Ysize;
|
|
|
|
if( !(t = im_open_local( out, "im_wrap", "p" )) ||
|
|
im_replicate( in, t, 2, 2 ) ||
|
|
im_extract_area( t, out, x, y, in->Xsize, in->Ysize ) )
|
|
return( -1 );
|
|
|
|
out->Xoffset = x;
|
|
out->Yoffset = y;
|
|
|
|
return( 0 );
|
|
}
|