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better handling of flip in autorot

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if the orientation is one of the ones we don't handle (ie. there's a
flip as well as a rot), don't wipe the header tag

thanks gertcuykens for the suggestion

see https://github.com/libvips/libvips/issues/1028
This commit is contained in:
John Cupitt 2018-10-06 13:44:22 +01:00
parent 301a08bf3c
commit 883facb1c0
1 changed files with 43 additions and 4 deletions
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47
libvips/conversion/autorot.c
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@ -4,6 +4,8 @@
* - from jpegload
* 12/4/16
* - test and remove orientation from every ifd
* 6/10/18
* - don't remove orientation if it's one of the cases we don't handle
*/
/*
@ -108,6 +110,34 @@ vips_autorot_get_angle( VipsImage *im )
return( angle );
}
/* TRUE if this is one of the cases we handle.
*/
static gboolean
vips_autorot_handled( VipsImage *im )
{
int orientation;
gboolean handled;
if( !vips_image_get_typeof( im, VIPS_META_ORIENTATION ) ||
vips_image_get_int( im, VIPS_META_ORIENTATION, &orientation ) )
orientation = 1;
switch( orientation ) {
case 1:
case 3:
case 6:
case 8:
handled = TRUE;
break;
default:
handled = FALSE;
break;
}
return( handled );
}
static void *
vips_autorot_remove_angle_sub( VipsImage *image,
const char *field, GValue *value, void *my_data )
@ -152,9 +182,17 @@ vips_autorot_build( VipsObject *object )
g_object_set( object,
"angle", vips_autorot_get_angle( autorot->in ),
NULL );
if( vips_rot( autorot->in, &t[0], autorot->angle, NULL ) )
return( -1 );
vips_autorot_remove_angle( t[0] );
if( vips_autorot_handled( autorot->in ) ) {
if( vips_rot( autorot->in, &t[0], autorot->angle, NULL ) )
return( -1 );
vips_autorot_remove_angle( t[0] );
}
else {
if( vips_copy( autorot->in, &t[0], NULL ) )
return( -1 );
}
if( vips_image_write( t[0], conversion->out ) )
return( -1 );
@ -211,7 +249,8 @@ vips_autorot_init( VipsAutorot *autorot )
* Read @angle to find the amount the image was rotated by.
*
* vips only supports the four simple rotations, it does not support the
* various mirror modes.
* various mirror modes. If the image is using one of these mirror modes, the
* image is not rotated and the #VIPS_META_ORIENTATION tag is not removed.
*
* See also: vips_autorot_get_angle(), vips_autorot_remove_angle(), vips_rot().
*