Do not rotate pictures if the browser already handled it

public/scripts/movim_utils.js

@@ -173,37 +173,58 @@ var MovimUtils = {
         return bytes.toFixed(1)+' '+units[u];
     },
     getOrientation : function(file, callback) {
-        var reader = new FileReader();
-
-        reader.onload = function(e) {
-            var view = new DataView(e.target.result);
-            if (view.getUint16(0, false) != 0xFFD8) return callback(-2);
-            var length = view.byteLength, offset = 2;
-
-            while (offset < length) {
-                var marker = view.getUint16(offset, false);
-                offset += 2;
-                if (marker == 0xFFE1) {
-                    if (view.getUint32(offset += 2, false) != 0x45786966) return callback(-1);
-
-                    var little = view.getUint16(offset += 6, false) == 0x4949;
-                    offset += view.getUint32(offset + 4, little);
-
-                    var tags = view.getUint16(offset, little);
-                    offset += 2;
-
-                    for (var i = 0; i < tags; i++)
-                        if (view.getUint16(offset + (i * 12), little) == 0x0112)
-
-                    return callback(view.getUint16(offset + (i * 12) + 8, little));
-                }
-                else if ((marker & 0xFF00) != 0xFF00) break;
-                else offset += view.getUint16(offset, false);
+        var testImageURL =
+        'data:image/jpeg;base64,/9j/4QAiRXhpZgAATU0AKgAAAAgAAQESAAMAAAABAAYAAAA' +
+        'AAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA' +
+        'QEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE' +
+        'BAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/AABEIAAIAAwMBEQACEQEDEQH/x' +
+        'ABRAAEAAAAAAAAAAAAAAAAAAAAKEAEBAQADAQEAAAAAAAAAAAAGBQQDCAkCBwEBAAAAAAA' +
+        'AAAAAAAAAAAAAABEBAAAAAAAAAAAAAAAAAAAAAP/aAAwDAQACEQMRAD8AG8T9NfSMEVMhQ' +
+        'voP3fFiRZ+MTHDifa/95OFSZU5OzRzxkyejv8ciEfhSceSXGjS8eSdLnZc2HDm4M3BxcXw' +
+        'H/9k='
+
+        var img = document.createElement('img');
+        img.onload = function () {
+            // Check if the browser supports automatic image orientation:
+            let orientation = img.width === 2 && img.height === 3;
+
+            if (orientation) {
+                return callback(-1);
+            } else {
+                var reader = new FileReader();
+
+                reader.onload = function(e) {
+                    var view = new DataView(e.target.result);
+                    if (view.getUint16(0, false) != 0xFFD8) return callback(-2);
+                    var length = view.byteLength, offset = 2;
+
+                    while (offset < length) {
+                        var marker = view.getUint16(offset, false);
+                        offset += 2;
+                        if (marker == 0xFFE1) {
+                            if (view.getUint32(offset += 2, false) != 0x45786966) return callback(-1);
+
+                            var little = view.getUint16(offset += 6, false) == 0x4949;
+                            offset += view.getUint32(offset + 4, little);
+
+                            var tags = view.getUint16(offset, little);
+                            offset += 2;
+
+                            for (var i = 0; i < tags; i++)
+                                if (view.getUint16(offset + (i * 12), little) == 0x0112)
+
+                            return callback(view.getUint16(offset + (i * 12) + 8, little));
+                        }
+                        else if ((marker & 0xFF00) != 0xFF00) break;
+                        else offset += view.getUint16(offset, false);
+                    }
+
+                    return callback(-1);
+                };
+
+                reader.readAsArrayBuffer(file);
             }
-
-            return callback(-1);
-        };
-
-        reader.readAsArrayBuffer(file);
+        }
+        img.src = testImageURL
     }
 };