| /* im_rot180 |
| * |
| * Copyright: 1991, N. Dessipris |
| * Written on: 28/10/91 |
| * Updated on: 2/4/92, J.Cupitt |
| * bugs in im_la90rot fixed, now works for any type. |
| * 19/7/93 JC |
| * - IM_CODING_LABQ allowed now |
| * 15/11/94 JC |
| * - name changed |
| * - memory leaks fixed |
| * 8/2/95 JC |
| * - oops! memory allocation problem fixed |
| * 18/5/95 JC |
| * - IM_MAXLINES increased |
| * 13/8/96 JC |
| * - rewritten for partials |
| * - adapted from im_rot90 |
| * 14/4/04 |
| * - sets Xoffset / Yoffset |
| * 24/3/09 |
| * - added IM_CODING_RAD support |
| * 1/2/10 |
| * - cleanups |
| * - gtkdoc |
| */ |
| |
| /* |
| |
| 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 <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| static int |
| rot180_gen( REGION *or, void *seq, void *a, void *b ) |
| { |
| REGION *ir = (REGION *) seq; |
| IMAGE *in = (IMAGE *) a; |
| |
| /* Output area. |
| */ |
| Rect *r = &or->valid; |
| int le = r->left; |
| int ri = IM_RECT_RIGHT(r); |
| int to = r->top; |
| int bo = IM_RECT_BOTTOM(r); |
| |
| int x, y; |
| |
| /* Pixel geometry. |
| */ |
| int ps; |
| |
| /* Find the area of the input image we need. |
| */ |
| Rect need; |
| |
| need.left = in->Xsize - ri; |
| need.top = in->Ysize - bo; |
| need.width = r->width; |
| need.height = r->height; |
| if( im_prepare( ir, &need ) ) |
| return( -1 ); |
| |
| /* Find PEL size and line skip for ir. |
| */ |
| ps = IM_IMAGE_SIZEOF_PEL( in ); |
| |
| /* Rotate the bit we now have. |
| */ |
| for( y = to; y < bo; y++ ) { |
| /* Start of this output line. |
| */ |
| PEL *q = (PEL *) IM_REGION_ADDR( or, le, y ); |
| |
| /* Corresponding position in ir. |
| */ |
| PEL *p = (PEL *) IM_REGION_ADDR( ir, |
| need.left + need.width - 1, |
| need.top + need.height - (y - to) - 1 ); |
| |
| /* Blap across! |
| */ |
| for( x = le; x < ri; x++ ) { |
| memcpy( q, p, ps ); |
| q += ps; |
| p -= ps; |
| } |
| } |
| |
| return( 0 ); |
| } |
| |
| /** |
| * im_rot180: |
| * @in: input image |
| * @out: output image |
| * |
| * Rotate an image 180 degrees. |
| * |
| * See also: im_rot90(), im_rot270(), im_affinei_all(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_rot180( IMAGE *in, IMAGE *out ) |
| { |
| if( im_piocheck( in, out ) || |
| im_check_coding_known( "im_rot180", in ) ) |
| return( -1 ); |
| |
| if( im_cp_desc( out, in ) || |
| im_demand_hint( out, IM_THINSTRIP, in, NULL ) ) |
| return( -1 ); |
| |
| if( im_generate( out, |
| im_start_one, rot180_gen, im_stop_one, in, NULL ) ) |
| return( -1 ); |
| |
| out->Xoffset = in->Xsize; |
| out->Yoffset = in->Ysize; |
| |
| return( 0 ); |
| } |
| |