/* @(#) Flips image left-right. * @(#) * @(#) Usage: * @(#) * @(#) int im_fliphor( IMAGE *in, IMAGE *out ) * @(#) * @(#) Returns 0 on sucess and -1 on error * @(#) * 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 */ /* 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 #endif /*HAVE_CONFIG_H*/ #include #include #include #ifdef WITH_DMALLOC #include #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 ); } /* Copy image. */ int im_fliphor( IMAGE *in, IMAGE *out ) { /* Check args. */ if( im_piocheck( in, out ) ) return( -1 ); if( in->Coding != IM_CODING_NONE && in->Coding != IM_CODING_LABQ ) { im_error( "im_fliphor", "%s", _( "in must be uncoded" ) ); return( -1 ); } /* Prepare output header. */ if( im_cp_desc( out, in ) ) return( -1 ); /* Set demand hints. */ if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) ) return( -1 ); /* Generate! */ if( im_generate( out, im_start_one, flip_gen, im_stop_one, in, NULL ) ) return( -1 ); out->Xoffset = in->Xsize; out->Yoffset = 0; return( 0 ); }