| /* 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> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /** |
| * 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 ); |
| } |