148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
/* @(#) Flips image up-down.
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int im_flipver( 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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* 21/12/94 JC
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* - adapted from new im_fliphor().
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* 30/8/96 JC
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* - ooops! IM_REGION_SIZEOF_LINE() not valid until im_prepare() has been
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* called
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* 7/3/03 JC
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* - ahem, memcpy() line size calc was wrong, occasional segvs
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* 14/4/04
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* - sets Xoffset / Yoffset
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* 24/3/09
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* - added IM_CODING_RAD support
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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 <string.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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PEL *p, *q;
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int y;
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int le = r->left;
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int to = r->top;
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int bo = IM_RECT_BOTTOM( r );
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int ls;
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int psk, qsk;
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/* Transform to input coordinates.
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*/
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in = *r;
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in.top = ir->im->Ysize - bo;
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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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p = (PEL *) IM_REGION_ADDR( ir, le, in.top + in.height - 1 );
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q = (PEL *) IM_REGION_ADDR( or, le, to );
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psk = IM_REGION_LSKIP( ir );
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qsk = IM_REGION_LSKIP( or );
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ls = IM_REGION_SIZEOF_LINE( or );
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for( y = to; y < bo; y++ ) {
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memcpy( q, p, ls );
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p -= psk;
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q += qsk;
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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_flipver( 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 &&
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in->Coding != IM_CODING_LABQ &&
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in->Coding != IM_CODING_RAD ) {
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im_error( "im_flipver", "%s",
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_( "Coding must be NONE, LABQ or RAD" ) );
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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 = 0;
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out->Yoffset = in->Ysize;
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return( 0 );
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}
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