| /* im_fliphor |
| * |
| * Copyright: 1990, N. Dessipris |
| * Written on: 28/10/91 |
| * Updated on: |
| * 19/7/93 JC |
| * - now allows IM_CODING_LABQ too |
| * - yuk! needs rewriting |
| * 21/12/94 JC |
| * - rewritten |
| * 14/4/04 |
| * - sets Xoffset / Yoffset |
| * 24/3/09 |
| * - added IM_CODING_RAD support |
| * 29/1/10 |
| * - 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 <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /* Flip a small area. |
| */ |
| static int |
| flip_gen( REGION *or, void *seq, void *a, void *b ) |
| { |
| REGION *ir = (REGION *) seq; |
| Rect *r = &or->valid; |
| Rect in; |
| char *p, *q; |
| int x, y, z; |
| |
| int le = r->left; |
| int ri = IM_RECT_RIGHT(r); |
| int to = r->top; |
| int bo = IM_RECT_BOTTOM(r); |
| |
| int ps = IM_IMAGE_SIZEOF_PEL( ir->im ); /* sizeof pel */ |
| |
| int hgt = ir->im->Xsize - r->width; |
| |
| int lastx; |
| |
| /* Transform to input coordinates. |
| */ |
| in = *r; |
| in.left = hgt - r->left; |
| |
| /* Find x of final pixel in input area. |
| */ |
| lastx = IM_RECT_RIGHT( &in ) - 1; |
| |
| /* Ask for input we need. |
| */ |
| if( im_prepare( ir, &in ) ) |
| return( -1 ); |
| |
| /* Loop, copying and reversing lines. |
| */ |
| for( y = to; y < bo; y++ ) { |
| p = IM_REGION_ADDR( ir, lastx, y ); |
| q = IM_REGION_ADDR( or, le, y ); |
| |
| for( x = le; x < ri; x++ ) { |
| /* Copy the pel. |
| */ |
| for( z = 0; z < ps; z++ ) |
| q[z] = p[z]; |
| |
| /* Skip forwards in out, back in in. |
| */ |
| q += ps; |
| p -= ps; |
| } |
| } |
| |
| return( 0 ); |
| } |
| |
| /** |
| * im_fliphor: |
| * @in: input image |
| * @out: output image |
| * |
| * Flips an image left-right. |
| * |
| * See also: im_flipver(), im_rot90(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_fliphor( IMAGE *in, IMAGE *out ) |
| { |
| if( im_piocheck( in, out ) || |
| im_check_coding_known( "im_fliphor", in ) || |
| im_cp_desc( out, in ) || |
| im_demand_hint( out, IM_THINSTRIP, in, NULL ) || |
| im_generate( out, |
| im_start_one, flip_gen, im_stop_one, in, NULL ) ) |
| return( -1 ); |
| |
| out->Xoffset = in->Xsize; |
| out->Yoffset = 0; |
| |
| return( 0 ); |
| } |