156 lines
3.4 KiB
C
156 lines
3.4 KiB
C
/* Functions to create offsets for rotating square masks.
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*
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* Author: N. Dessipris (Copyright, N. Dessipris 1991)
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* Written on: 08/05/1991
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* Modified on: 28/05/1991
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* 12/10/95 JC
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* - small revisions, needs rewriting really
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* 7/8/96 JC
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* - absolutely foul desp code revised
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* - many bugs and mem leaks fixed
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* 1/3/99 JC
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* - oops, fns were not preserving scale and offset
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* 1/12/10
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* - allow any size mask for the 90 degree rotates by using im_rot90().
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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/*
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#define PIM_RINT 1
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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 <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/vips7compat.h>
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/* The type of the vips operations we support.
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*/
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typedef int (*vips_fn)( IMAGE *in, IMAGE *out );
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/* Pass a mask through a vips operation, eg. im_rot90().
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*/
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static INTMASK *
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vapplyimask( INTMASK *in, const char *name, vips_fn fn )
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{
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IMAGE *x;
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IMAGE *t[2];
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DOUBLEMASK *d[2];
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INTMASK *out;
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if( !(x = im_open( name, "p" )) )
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return( NULL );
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if( !(d[0] = im_local_dmask( x, im_imask2dmask( in, name ) )) ||
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im_open_local_array( x, t, 2, name, "p" ) ||
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im_mask2vips( d[0], t[0] ) ||
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fn( t[0], t[1] ) ||
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!(d[1] = im_local_dmask( x, im_vips2mask( t[1], name ) )) ||
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!(out = im_dmask2imask( d[1], name )) ) {
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im_close( x );
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return( NULL );
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}
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im_close( x );
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out->scale = in->scale;
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out->offset = in->offset;
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return( out );
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}
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static DOUBLEMASK *
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vapplydmask( DOUBLEMASK *in, const char *name, vips_fn fn )
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{
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IMAGE *x;
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IMAGE *t[2];
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DOUBLEMASK *out;
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if( !(x = im_open( name, "p" )) )
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return( NULL );
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if( im_open_local_array( x, t, 2, name, "p" ) ||
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im_mask2vips( in, t[0] ) ||
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fn( t[0], t[1] ) ||
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!(out = im_vips2mask( t[1], name )) ) {
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im_close( x );
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return( NULL );
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}
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im_close( x );
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out->scale = in->scale;
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out->offset = in->offset;
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return( out );
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}
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INTMASK *
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im_rotate_imask90( INTMASK *in, const char *filename )
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{
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return( vapplyimask( in, filename, im_rot90 ) );
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}
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DOUBLEMASK *
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im_rotate_dmask90( DOUBLEMASK *in, const char *filename )
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{
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return( vapplydmask( in, filename, im_rot90 ) );
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}
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static int
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im_rot45( IMAGE *in, IMAGE *out )
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{
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VipsImage *t;
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if( vips_rot45( in, &t, NULL ) )
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return( -1 );
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if( vips_image_write( t, out ) ) {
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g_object_unref( t );
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return( -1 );
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}
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g_object_unref( t );
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return( 0 );
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}
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INTMASK *
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im_rotate_imask45( INTMASK *in, const char *filename )
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{
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return( vapplyimask( in, filename, im_rot45 ) );
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}
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DOUBLEMASK *
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im_rotate_dmask45( DOUBLEMASK *in, const char *filename )
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{
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return( vapplydmask( in, filename, im_rot45 ) );
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}
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