177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/* im_wrap
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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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* 2/2/10
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* - rewritten in terms of im_replicate()/im_extract_area()
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* - gtkdoc
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* - allows any x/y
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* 31/5/13
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* - redone as a class
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* - added rotquad behaviour if x/y not set
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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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#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 <vips/vips.h>
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#include "pconversion.h"
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typedef struct _VipsWrap {
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VipsConversion parent_instance;
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VipsImage *in;
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int x;
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int y;
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} VipsWrap;
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typedef VipsConversionClass VipsWrapClass;
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G_DEFINE_TYPE( VipsWrap, vips_wrap, VIPS_TYPE_CONVERSION );
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static int
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vips_wrap_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsWrap *wrap = (VipsWrap *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 7 );
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int x;
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int y;
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if( VIPS_OBJECT_CLASS( vips_wrap_parent_class )->build( object ) )
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return( -1 );
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if( !vips_object_argument_isset( object, "x" ) )
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wrap->x = wrap->in->Xsize / 2;
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if( !vips_object_argument_isset( object, "y" ) )
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wrap->y = wrap->in->Ysize / 2;
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/* Clock arithmetic: we want negative x/y to wrap around
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* nicely.
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*/
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x = wrap->x < 0 ?
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-wrap->x % wrap->in->Xsize :
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wrap->in->Xsize - wrap->x % wrap->in->Xsize;
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y = wrap->y < 0 ?
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-wrap->y % wrap->in->Ysize :
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wrap->in->Ysize - wrap->y % wrap->in->Ysize;
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if( vips_replicate( wrap->in, &t[0], 2, 2, NULL ) ||
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vips_extract_area( t[0], &t[1],
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x, y, wrap->in->Xsize, wrap->in->Ysize, NULL ) ||
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vips_image_write( t[1], conversion->out ) )
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return( -1 );
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conversion->out->Xoffset = x;
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conversion->out->Yoffset = y;
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return( 0 );
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}
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static void
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vips_wrap_class_init( VipsWrapClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "wrap";
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vobject_class->description = _( "wrap image origin" );
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vobject_class->build = vips_wrap_build;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsWrap, in ) );
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VIPS_ARG_INT( class, "x", 3,
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_( "x" ),
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_( "Left edge of input in output" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsWrap, x ),
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-VIPS_MAX_COORD, VIPS_MAX_COORD, 0 );
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VIPS_ARG_INT( class, "y", 4,
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_( "y" ),
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_( "Top edge of input in output" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsWrap, y ),
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-VIPS_MAX_COORD, VIPS_MAX_COORD, 0 );
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}
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static void
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vips_wrap_init( VipsWrap *wrap )
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{
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}
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/**
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* vips_wrap: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* * @x: horizontal displacement
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* * @y: vertical displacement
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*
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* Slice an image up and move the segments about so that the pixel that was
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* at 0, 0 is now at @x, @y. If @x and @y are not set, they default to the
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* centre of the image.
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*
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* See also: vips_embed(), vips_replicate().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_wrap( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "wrap", ap, in, out );
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va_end( ap );
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return( result );
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}
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