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QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs

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+using System.IO;
+using System.Windows;
+using System.Windows.Media.Imaging;
+
+namespace QuickLook.Plugin.ImageViewer
+{
+    internal static class ImageFileHelper
+    {
+        internal static Size GetImageSize(string path)
+        {
+            var ori = GetOrientationFromExif(path);
+
+            using (var stream = File.OpenRead(path))
+            {
+                var decoder = BitmapDecoder.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.None);
+                var frame = decoder.Frames[0];
+
+                if (ori == ExifOrientation.Rotate90CW || ori == ExifOrientation.Rotate270CW)
+                    return new Size {Width = frame.PixelHeight, Height = frame.PixelWidth};
+
+                return new Size {Width = frame.PixelWidth, Height = frame.PixelHeight};
+            }
+        }
+
+        internal static ExifOrientation GetOrientationFromExif(string path)
+        {
+            using (var stream = File.OpenRead(path))
+            {
+                var decoder = BitmapDecoder.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.None);
+                var frame = decoder.Frames[0];
+
+                var orientation = ((BitmapMetadata) frame.Metadata).GetQuery(@"/app1/{ushort=0}/{ushort=274}");
+
+                if (orientation == null)
+                    return ExifOrientation.Horizontal;
+
+                return (ExifOrientation) (ushort) orientation;
+            }
+        }
+
+        internal enum ExifOrientation
+        {
+            Horizontal = 1,
+            MirrorHorizontal = 2,
+            Rotate180 = 3,
+            MirrorVertical = 4,
+            MirrorHorizontal270CW = 5,
+            Rotate90CW = 6,
+            MirrorHorizontal90CW = 7,
+            Rotate270CW = 8
+        }
+    }
+}