From d2320394cab526372926a07d6648ad08fe21377f Mon Sep 17 00:00:00 2001
From: "B. Petersen" <r10s@b44t.com>
Date: Mon, 15 Jun 2020 01:13:11 +0200
Subject: [PATCH] convert exif orientation to desired pixel rotation

---
 src/blob.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/blob.rs b/src/blob.rs
index 2946f882e..fbf83bae8 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -427,6 +427,18 @@ impl<'a> BlobObject<'a> {
     }
 
     pub fn get_exif_orientation(&self) -> Result<i32, Error> {
+        let file = std::fs::File::open(self.to_abs_path())?;
+        let mut bufreader = std::io::BufReader::new(&file);
+        let exifreader = exif::Reader::new();
+        let exif = exifreader.read_from_container(&mut bufreader)?;
+        if let Some(orientation) = exif.get_field(exif::Tag::Orientation, exif::In::PRIMARY) {
+            match orientation.value.get_uint(0) {
+                Some(3) => return Ok(180),
+                Some(6) => return Ok(90),
+                Some(8) => return Ok(270),
+                _ => {}
+            }
+        }
         Ok(0)
     }
 }