152 lines
3.0 KiB
C
152 lines
3.0 KiB
C
/* @(#) Flips image left-right.
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int im_fliphor( IMAGE *in, IMAGE *out )
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* @(#)
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* @(#) Returns 0 on sucess and -1 on error
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* @(#)
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* Copyright: 1990, N. Dessipris
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* Written on: 28/10/91
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* Updated on:
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* 19/7/93 JC
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* - now allows IM_CODING_LABQ too
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* - yuk! needs rewriting
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* 21/12/94 JC
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* - rewritten
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* 14/4/04
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* - sets Xoffset / Yoffset
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Flip a small area.
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*/
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static int
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flip_gen( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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Rect *r = &or->valid;
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Rect in;
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char *p, *q;
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int x, y, z;
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int le = r->left;
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int ri = IM_RECT_RIGHT(r);
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int to = r->top;
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int bo = IM_RECT_BOTTOM(r);
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int ps = IM_IMAGE_SIZEOF_PEL( ir->im ); /* sizeof pel */
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int hgt = ir->im->Xsize - r->width;
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int lastx;
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/* Transform to input coordinates.
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*/
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in = *r;
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in.left = hgt - r->left;
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/* Find x of final pixel in input area.
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*/
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lastx = IM_RECT_RIGHT( &in ) - 1;
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/* Ask for input we need.
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*/
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if( im_prepare( ir, &in ) )
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return( -1 );
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/* Loop, copying and reversing lines.
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*/
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for( y = to; y < bo; y++ ) {
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p = IM_REGION_ADDR( ir, lastx, y );
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q = IM_REGION_ADDR( or, le, y );
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for( x = le; x < ri; x++ ) {
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/* Copy the pel.
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*/
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for( z = 0; z < ps; z++ )
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q[z] = p[z];
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/* Skip forwards in out, back in in.
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*/
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q += ps;
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p -= ps;
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}
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}
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return( 0 );
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}
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/* Copy image.
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*/
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int
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im_fliphor( IMAGE *in, IMAGE *out )
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{
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/* Check args.
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*/
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if( im_piocheck( in, out ) )
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return( -1 );
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if( in->Coding != IM_CODING_NONE && in->Coding != IM_CODING_LABQ ) {
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im_error( "im_fliphor", _( "in must be uncoded" ) );
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return( -1 );
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}
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/* Prepare output header.
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*/
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if( im_cp_desc( out, in ) )
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return( -1 );
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/* Set demand hints.
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*/
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if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
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return( -1 );
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/* Generate!
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*/
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if( im_generate( out, im_start_one, flip_gen, im_stop_one, in, NULL ) )
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return( -1 );
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out->Xoffset = in->Xsize;
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out->Yoffset = 0;
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return( 0 );
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}
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