From a2b760c5230b1cea05fb82339627db0f92ecdb0c Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Mon, 10 Mar 2014 13:25:02 +0000
Subject: [PATCH] handle other exif orientation tag values

though not the mirroring ones
---
 tools/vipsthumbnail.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/vipsthumbnail.c b/tools/vipsthumbnail.c
index 016e3902..dc130765 100644
--- a/tools/vipsthumbnail.c
+++ b/tools/vipsthumbnail.c
@@ -146,6 +146,18 @@ get_angle( VipsImage *im )
 		!vips_image_get_string( im, ORIENTATION, &orientation ) ) {
 		if( vips_isprefix( "6", orientation ) )
 			angle = VIPS_ANGLE_90;
+		else if( vips_isprefix( "8", orientation ) )
+			angle = VIPS_ANGLE_270;
+		else if( vips_isprefix( "3", orientation ) )
+			angle = VIPS_ANGLE_180;
+
+		/* Other values do rotate + mirror, don't bother handling them
+		 * though, how common can mirroring be. 
+		 *
+		 * See:
+		 *
+		 * http://www.80sidea.com/archives/2316
+		 */
 	}
 
 	return( angle );