203 lines
4.7 KiB
C
203 lines
4.7 KiB
C
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/* Copy an image.
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*
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* Copyright: 1990, N. Dessipris, based on im_powtra()
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* Author: Nicos Dessipris
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* Written on: 02/05/1990
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* Modified on:
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* 23/4/93 J.Cupitt
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* - adapted to work with partial images
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* 30/6/93 JC
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* - adapted for partial v2
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* - and ANSI C
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* 7/7/93 JC
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* - now does IM_CODING_LABQ too
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* 22/2/95 JC
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* - new use of im_region_region()
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* 25/6/02 JC
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* - added im_copy_set()
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* - hint is IM_ANY
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* 5/9/02 JC
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* - added xoff/yoff to copy_set
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* 14/4/04 JC
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* - im_copy() now zeros Xoffset/Yoffset (since origin is the same as
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* input)
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* 26/5/04 JC
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* - added im_copy_swap()
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* 1/6/05
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* - added im_copy_morph()
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* 13/6/05
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* - oop, im_copy_set() was messed up
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* 29/9/06
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* - added im_copy_set_meta(), handy wrapper for nip2 to set meta fields
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* 2/11/06
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* - moved im__convert_saveable() here so it's always defined (was part
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* of JPEG write code)
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* 15/2/08
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* - added im__saveable_t ... so we can have CMYK JPEG write
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* 24/3/09
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* - added IM_CODING_RAD support
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* 28/1/10
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* - gtk-doc
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* - cleanups
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* - removed im_copy_from() and associated stuff
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* - added im_copy_native()
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* 28/11/10
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* - im_copy_set() now sets xoff / yoff again hmmm
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* 29/9/11
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* - rewrite as a class
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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 <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include "conversion.h"
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/**
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* VipsCopy:
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* @in: input image
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* @out: output image
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*
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* Copy an image, optionally modifying the header. VIPS copies images by
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* copying pointers, so this operation is fast, even for very large images.
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*
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* Returns: 0 on success, -1 on error.
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*/
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/* Properties.
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*/
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enum {
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PROP_INPUT = 1,
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PROP_LAST
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};
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typedef struct _VipsCopy {
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VipsConversion parent_instance;
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/* The input image.
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*/
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VipsImage *input;
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} VipsCopy;
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typedef VipsConversionClass VipsCopyClass;
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G_DEFINE_TYPE( VipsCopy, vips_copy, VIPS_TYPE_CONVERSION );
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/* Copy a small area.
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*/
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static int
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vips_copy_gen( VipsRegion *or, void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsRect *r = &or->valid;
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/* Ask for input we need.
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*/
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if( vips_region_prepare( ir, r ) )
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return( -1 );
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/* Attach output region to that.
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*/
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if( vips_region_region( or, ir, r, r->left, r->top ) )
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return( -1 );
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return( 0 );
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}
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static int
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vips_copy_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsCopy *copy = (VipsCopy *) object;
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if( VIPS_OBJECT_CLASS( vips_copy_parent_class )->build( object ) )
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return( -1 );
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if( vips_image_pio_input( copy->input ) ||
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vips_image_pio_output( conversion->output ) )
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return( -1 );
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/* Use props to adjust header fields.
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*/
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vips_demand_hint( conversion->output,
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VIPS_DEMAND_STYLE_THINSTRIP, copy->input, NULL );
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if( vips_image_generate( conversion->output,
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vips_start_one, vips_copy_gen, vips_stop_one,
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copy->input, copy ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_copy_class_init( VipsCopyClass *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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GParamSpec *pspec;
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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 = "copy";
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vobject_class->description = _( "copy an image" );
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vobject_class->build = vips_copy_build;
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/* Create properties.
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*/
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pspec = g_param_spec_object( "input",
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"Input", "Input image argument",
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VIPS_TYPE_IMAGE,
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G_PARAM_READWRITE );
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g_object_class_install_property( gobject_class,
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PROP_INPUT, pspec );
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vips_object_class_install_argument( vobject_class, pspec,
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsCopy, input ) );
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}
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static void
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vips_copy_init( VipsCopy *copy )
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{
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/* Init our instance fields.
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*/
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}
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