128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/* Wrap an image so that what was the origin is at (x,y).
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*
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* int im_wrap( IMAGE *in, IMAGE *out, int x, int y );
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*
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* All functions return 0 on success and -1 on error
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*
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* Copyright: 2008, Nottingham Trent University
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* Author: Tom Vajzovic
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* Written on: 2008-01-15
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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 <stdlib.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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static int wrap( REGION *out, void *seq, void *a, void *b ){
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#define IM ((IMAGE*)a)
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#define X (((int*)b)[0])
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#define Y (((int*)b)[1])
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int left= out-> valid. left - X;
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int top= out-> valid. top - Y;
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int right= left + out-> valid. width;
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int bot= top + out-> valid. height;
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Rect source_a= {
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left: IM-> Xsize + left,
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top: IM-> Ysize + top,
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width: 0 < right ? -left : out-> valid. width,
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height: 0 < bot ? -top : out-> valid. height
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};
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Rect source_b= {
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left: source_a. left,
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top: 0 > top ? 0 : top,
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width: source_a. width,
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height: 0 > top ? bot : out-> valid. height
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};
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Rect source_c= {
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left: 0 > left ? 0 : left,
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top: source_a. top,
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width: 0 > left ? right : out-> valid. width,
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height: source_a. height
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};
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Rect source_d= {
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left: source_c. left,
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top: source_b. top,
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width: source_c. width,
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height: source_b. height
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};
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if( 0 > left ){
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if( 0 > top && im_prepare_to( (REGION*)seq, out, & source_a,
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out-> valid. left, out-> valid. top ))
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return -1;
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if( 0 < bot && im_prepare_to( (REGION*)seq, out, & source_b,
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out-> valid. left, 0 > top ? Y : out-> valid. top ))
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return -1;
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}
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if( 0 < right ){
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if( 0 > top && im_prepare_to( (REGION*)seq, out, & source_c,
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0 > left ? X : out-> valid. left, out-> valid. top ))
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return -1;
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if( 0 < bot && im_prepare_to( (REGION*)seq, out, & source_d,
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0 > left ? X : out-> valid. left, 0 > top ? Y : out-> valid. top ))
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return -1;
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}
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return 0;
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#undef IM
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#undef X
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#undef Y
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}
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int im_wrap( IMAGE *in, IMAGE *out, int x, int y ){
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if( im_piocheck( in, out ))
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return -1;
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{
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int *params= IM_ARRAY( out, 2, int );
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if( ! params )
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return -1;
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params[ 0 ]= x % in-> Xsize;
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params[ 1 ]= y % in-> Ysize;
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if( 0 > x )
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params[ 0 ]+= in-> Xsize;
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if( 0 > y )
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params[ 1 ]+= in-> Ysize;
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return im_cp_desc( out, in )
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|| im_demand_hint( out, IM_THINSTRIP, in, NULL )
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|| im_generate( out, im_start_one, wrap, im_stop_one, (void*)in, (void*)params );
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}
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}
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