1 files changed, 72 insertions, 0 deletions
diff --git a/MediaBrowser.Controller/Drawing/ImageHelper.cs b/MediaBrowser.Controller/Drawing/ImageHelper.cs
new file mode 100644
index 000000000..6fb9f256e
--- /dev/null
+++ b/MediaBrowser.Controller/Drawing/ImageHelper.cs
@@ -0,0 +1,72 @@
+using System;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Model.Drawing;
+using MediaBrowser.Model.Entities;
+
+namespace MediaBrowser.Controller.Drawing
+{
+    public static class ImageHelper
+    {
+        public static ImageSize GetNewImageSize(ImageProcessingOptions options, ImageSize? originalImageSize)
+        {
+            if (originalImageSize.HasValue)
+            {
+                // Determine the output size based on incoming parameters
+                var newSize = DrawingUtils.Resize(originalImageSize.Value, options.Width ?? 0, options.Height ?? 0, options.MaxWidth ?? 0, options.MaxHeight ?? 0);
+
+                return newSize;
+            }
+            return GetSizeEstimate(options);
+        }
+
+        public static IImageProcessor ImageProcessor { get; set; }
+
+        private static ImageSize GetSizeEstimate(ImageProcessingOptions options)
+        {
+            if (options.Width.HasValue && options.Height.HasValue)
+            {
+                return new ImageSize(options.Width.Value, options.Height.Value);
+            }
+
+            var aspect = GetEstimatedAspectRatio(options.Image.Type, options.Item);
+
+            var width = options.Width ?? options.MaxWidth;
+
+            if (width.HasValue)
+            {
+                var heightValue = width.Value / aspect;
+                return new ImageSize(width.Value, heightValue);
+            }
+
+            var height = options.Height ?? options.MaxHeight ?? 200;
+            var widthValue = aspect * height;
+            return new ImageSize(widthValue, height);
+        }
+
+        private static double GetEstimatedAspectRatio(ImageType type, BaseItem item)
+        {
+            switch (type)
+            {
+                case ImageType.Art:
+                case ImageType.Backdrop:
+                case ImageType.Chapter:
+                case ImageType.Screenshot:
+                case ImageType.Thumb:
+                    return 1.78;
+                case ImageType.Banner:
+                    return 5.4;
+                case ImageType.Box:
+                case ImageType.BoxRear:
+                case ImageType.Disc:
+                case ImageType.Menu:
+                    return 1;
+                case ImageType.Logo:
+                    return 2.58;
+                case ImageType.Primary:
+                    return item.GetDefaultPrimaryImageAspectRatio();
+                default:
+                    return 1;
+            }
+        }
+    }
+}