From cf11b6763bcc08c33d5bdd7d716c06cf7dd045a2 Mon Sep 17 00:00:00 2001
From: Jesper Cockx <jesper.cockx@cs.kuleuven.be>
Date: Tue, 26 Dec 2017 17:11:04 +0100
Subject: [PATCH] Preserve rotation from EXIF data if present

---
 dist/nano_photos_provider2.json.class.php | 31 ++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/dist/nano_photos_provider2.json.class.php b/dist/nano_photos_provider2.json.class.php
index f9b5fd3..2e1af4d 100644
--- a/dist/nano_photos_provider2.json.class.php
+++ b/dist/nano_photos_provider2.json.class.php
@@ -339,6 +339,28 @@ protected function Compare($a, $b)
       return ($b) ? +1 : -1;
     }
 
+    function image_fix_orientation(&$image, &$size, $filename) {
+        $exif = exif_read_data($filename);
+
+        if (!empty($exif['Orientation'])) {
+            switch ($exif['Orientation']) {
+                case 3:
+                    $image = imagerotate($image, 180, 0);
+                    break;
+
+                case 6:
+                    $image = imagerotate($image, -90, 0);
+                    list($size[0],$size[1]) = array($size[1],$size[0]);
+                    break;
+
+                case 8:
+                    $image = imagerotate($image, 90, 0);
+                    list($size[0],$size[1]) = array($size[1],$size[0]);
+                    break;
+            }
+        }
+    }
+
 
     /**
      * RETRIEVE ONE IMAGE'S DISPLAY URL
@@ -387,6 +409,8 @@ protected function GetImageDisplayURL( $baseFolder, $filename )
           break;
       }
 
+      $this->image_fix_orientation($orgImage, $size, $baseFolder . $filename);
+
       $width  = $size[0];
       $height = $size[1];
 
@@ -488,6 +512,9 @@ protected function GetDominantColorsGIF( $img )
           return '';
           break;
       }
+
+      $this->image_fix_orientation($orgImage, $size, $img);
+
       $width  = $size[0];
       $height = $size[1];
       $thumb = imagecreate(3, 3);
@@ -526,6 +553,7 @@ protected function GetDominantColor( $img )
           return '#000000';
           break;
       }
+      $this->image_fix_orientation($orgImage, $size, $img);
       $width  = $size[0];
       $height = $size[1];
       
@@ -591,6 +619,7 @@ protected function GenerateThumbnail2($baseFolder, $imagefilename, $thumbnailFil
             break;
         }
       }
+      $this->image_fix_orientation($orgImage, $size, $baseFolder . $imagefilename);
         
       $width  = $size[0];
       $height = $size[1];
@@ -959,4 +988,4 @@ protected function PrepareData($filename, $kind)
     }
 
 }
-?>
\ No newline at end of file
+?>