Add optional auto-orient support for IM strategies

Author: zerocrates

application/config/config.ini.changeme

@@ -265,6 +265,7 @@ mail.transport.type = "Sendmail"
 ;
 ; fileDerivatives.strategyOptions.page = "0"
 ; fileDerivatives.strategyOptions.gravity = "center"
+; fileDerivatives.strategyOptions.autoOrient = false
 
 ; fileDerivatives.typeWhitelist[]
 ; If set, Omeka will only attempt to create derivatives for files with the

application/libraries/Omeka/File/Derivative/Strategy/ExternalImageMagick.php

@@ -96,7 +96,12 @@ protected function _getConvertArgs($type, $constraint)
         $version = $this->getOption('version', '0');
 
         if ($type != 'square_thumbnail') {
-            return '-background white +repage -flatten -thumbnail ' . escapeshellarg("{$constraint}x{$constraint}>");
+            $args = array(
+                '-background white',
+                '+repage',
+                '-flatten',
+                '-thumbnail ' . escapeshellarg("{$constraint}x{$constraint}>")
+            );
         } else {
             $gravity = $this->getOption('gravity', 'Center');
             // Native square thumbnail resize requires at least version 6.3.8-3.
@@ -123,8 +128,12 @@ protected function _getConvertArgs($type, $constraint)
                     '+repage'
                 );
             }
-            return join (' ', $args);
         }
+
+        if ($this->getOption('autoOrient', false)) {
+            array_unshift($args, '-auto-orient');
+        }
+        return join (' ', $args);
     }
 
     /**

application/libraries/Omeka/File/Derivative/Strategy/Imagick.php

@@ -41,6 +41,10 @@ public function createImage($sourcePath, $destPath, $type, $sizeConstraint, $mim
             return false;
         }
 
+        if ($this->getOption('autoOrient', false)) {
+            $this->_autoOrient($imagick);
+        }
+
         $origX = $imagick->getImageWidth();
         $origY = $imagick->getImageHeight();
 
@@ -137,4 +141,39 @@ protected function _getCropOffsetY($resizedY, $sizeConstraint)
                 return (int) (($resizedY - $sizeConstraint) / 2);
         }
     }
+
+    protected function _autoOrient($imagick)
+    {
+        $orientation = $imagick->getImageOrientation();
+        $white = new ImagickPixel('#fff');
+        switch ($orientation) {
+            case Imagick::ORIENTATION_RIGHTTOP:
+                $imagick->rotateImage($white, 90);
+                break;
+            case Imagick::ORIENTATION_BOTTOMRIGHT:
+                $imagick->rotateImage($white, 180);
+                break;
+            case Imagick::ORIENTATION_LEFTBOTTOM:
+                $imagick->rotateImage($white, 270);
+                break;
+            case Imagick::ORIENTATION_TOPRIGHT:
+                $imagick->flopImage();
+                break;
+            case Imagick::ORIENTATION_RIGHTBOTTOM:
+                $imagick->flopImage();
+                $imagick->rotateImage($white, 90);
+                break;
+            case Imagick::ORIENTATION_BOTTOMLEFT:
+                $imagick->flopImage();
+                $imagick->rotateImage($white, 180);
+                break;
+            case Imagick::ORIENTATION_LEFTTOP:
+                $imagick->flopImage();
+                $imagick->rotateImage($white, 270);
+                break;
+            case Imagick::ORIENTATION_TOPLEFT:
+            default:
+                break;
+        }
+    }
 }