267 lines
5.7 KiB
C
267 lines
5.7 KiB
C
/* autorot
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*
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* 19/10/14
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* - from jpegload
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* 12/4/16
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* - test and remove orientation from every ifd
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* 6/10/18
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* - don't remove orientation if it's one of the cases we don't handle
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* 10/5/20
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* - handle mirrored images
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* - deprecate vips_autorot_get_angle()
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* 24/10/20
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* - only remove main image orientation, since we don't rotate the
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* embedded thumbnail
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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 DEBUG
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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 <string.h>
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#include <vips/vips.h>
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#include "pconversion.h"
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typedef struct _VipsAutorot {
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VipsConversion parent_instance;
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VipsImage *in;
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VipsAngle angle;
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gboolean flip;
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} VipsAutorot;
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typedef VipsConversionClass VipsAutorotClass;
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G_DEFINE_TYPE( VipsAutorot, vips_autorot, VIPS_TYPE_CONVERSION );
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static void *
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vips_autorot_remove_angle_sub( VipsImage *image,
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const char *field, GValue *value, void *my_data )
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{
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if( strcmp( field, "exif-ifd0-Orientation" ) == 0 ) {
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#ifdef DEBUG
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printf( "vips_autorot_remove_angle: %s\n", field );
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#endif /*DEBUG*/
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(void) vips_image_remove( image, field );
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}
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return( NULL );
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}
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/**
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* vips_autorot_remove_angle: (method)
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* @image: image to remove orientation from
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*
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* Remove the orientation tag on @image. Also remove any exif orientation tags.
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* You must vips_copy() the image before calling this function since it
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* modifies metadata.
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*/
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void
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vips_autorot_remove_angle( VipsImage *image )
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{
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(void) vips_image_remove( image, VIPS_META_ORIENTATION );
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(void) vips_image_map( image, vips_autorot_remove_angle_sub, NULL );
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}
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static int
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vips_autorot_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsAutorot *autorot = (VipsAutorot *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 3 );
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if( VIPS_OBJECT_CLASS( vips_autorot_parent_class )->build( object ) )
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return( -1 );
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VipsAngle angle;
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gboolean flip;
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VipsImage *in;
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in = autorot->in;
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switch( vips_image_get_orientation( in ) ) {
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case 2:
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angle = VIPS_ANGLE_D0;
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flip = TRUE;
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break;
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case 3:
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angle = VIPS_ANGLE_D180;
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flip = FALSE;
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break;
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case 4:
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angle = VIPS_ANGLE_D180;
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flip = TRUE;
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break;
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case 5:
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angle = VIPS_ANGLE_D90;
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flip = TRUE;
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break;
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case 6:
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angle = VIPS_ANGLE_D90;
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flip = FALSE;
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break;
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case 7:
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angle = VIPS_ANGLE_D270;
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flip = TRUE;
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break;
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case 8:
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angle = VIPS_ANGLE_D270;
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flip = FALSE;
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break;
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case 1:
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default:
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angle = VIPS_ANGLE_D0;
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flip = FALSE;
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break;
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}
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g_object_set( object,
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"angle", angle,
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"flip", flip,
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NULL );
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if( angle != VIPS_ANGLE_D0 ) {
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if( vips_rot( in, &t[0], angle, NULL ) )
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return( -1 );
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in = t[0];
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}
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if( flip ) {
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if( vips_flip( in, &t[1], VIPS_DIRECTION_HORIZONTAL, NULL ) )
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return( -1 );
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in = t[1];
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}
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/* We must copy before modifying metadata.
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*/
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if( vips_copy( in, &t[2], NULL ) )
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return( -1 );
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in = t[2];
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vips_autorot_remove_angle( in );
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if( vips_image_write( in, conversion->out ) )
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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_autorot_class_init( VipsAutorotClass *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 = "autorot";
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vobject_class->description = _( "autorotate image by exif tag" );
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vobject_class->build = vips_autorot_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( VipsAutorot, in ) );
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VIPS_ARG_ENUM( class, "angle", 6,
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_( "Angle" ),
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_( "Angle image was rotated by" ),
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VIPS_ARGUMENT_OPTIONAL_OUTPUT,
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G_STRUCT_OFFSET( VipsAutorot, angle ),
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VIPS_TYPE_ANGLE, VIPS_ANGLE_D0 );
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VIPS_ARG_BOOL( class, "flip", 7,
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_( "Flip" ),
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_( "Whether the image was flipped or not" ),
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VIPS_ARGUMENT_OPTIONAL_OUTPUT,
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G_STRUCT_OFFSET( VipsAutorot, flip ),
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FALSE );
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}
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static void
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vips_autorot_init( VipsAutorot *autorot )
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{
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autorot->angle = VIPS_ANGLE_D0;
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autorot->flip = FALSE;
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}
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/**
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* vips_autorot: (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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* * @angle: output #VipsAngle the image was rotated by
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* * @flip: output %gboolean whether the image was flipped
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*
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* Look at the image metadata and rotate and flip the image to make it
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* upright. The #VIPS_META_ORIENTATION tag is removed from @out to prevent
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* accidental double rotation.
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*
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* Read @angle to find the amount the image was rotated by. Read @flip to
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* see if the image was also flipped.
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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_autorot( 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( "autorot", ap, in, out );
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va_end( ap );
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return( result );
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}
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