reduce chapter db calls

MediaBrowser.Api/Images/ImageService.cs

@@ -679,7 +679,7 @@ namespace MediaBrowser.Api.Images
             }
 
             // See if we can avoid a file system lookup by looking for the file in ResolveArgs
-            var originalFileImageDateModified = kernel.ImageManager.GetImageDateModified(item, request.Type, index);
+            var originalFileImageDateModified = kernel.ImageManager.GetImageDateModified(item, imagePath);
 
             var supportedImageEnhancers = request.EnableImageEnhancers ? kernel.ImageManager.ImageEnhancers.Where(i =>
             {
@@ -723,7 +723,8 @@ namespace MediaBrowser.Api.Images
                 Item = currentItem,
                 Request = currentRequest,
                 OriginalImageDateModified = originalFileImageDateModified,
-                Enhancers = supportedImageEnhancers
+                Enhancers = supportedImageEnhancers,
+                OriginalImagePath = imagePath
 
             }, contentType);
         }

MediaBrowser.Api/Images/ImageWriter.cs

@@ -33,6 +33,8 @@ namespace MediaBrowser.Api.Images
         /// </summary>
         public DateTime OriginalImageDateModified;
 
+        public string OriginalImagePath;
+
         /// <summary>
         /// The _options
         /// </summary>
@@ -71,7 +73,7 @@ namespace MediaBrowser.Api.Images
                 cropwhitespace = Request.CropWhitespace.Value;
             }
 
-            return Kernel.Instance.ImageManager.ProcessImage(Item, Request.Type, Request.Index ?? 0, cropwhitespace,
+            return Kernel.Instance.ImageManager.ProcessImage(Item, Request.Type, Request.Index ?? 0, OriginalImagePath, cropwhitespace,
                                                     OriginalImageDateModified, responseStream, Request.Width, Request.Height, Request.MaxWidth,
                                                     Request.MaxHeight, Request.Quality, Enhancers);
         }

MediaBrowser.Controller/Drawing/ImageManager.cs

@@ -96,6 +96,7 @@ namespace MediaBrowser.Controller.Drawing
         /// <param name="entity">The entity that owns the image</param>
         /// <param name="imageType">The image type</param>
         /// <param name="imageIndex">The image index (currently only used with backdrops)</param>
+        /// <param name="originalImagePath">The original image path.</param>
         /// <param name="cropWhitespace">if set to <c>true</c> [crop whitespace].</param>
         /// <param name="dateModified">The last date modified of the original image file</param>
         /// <param name="toStream">The stream to save the new image to</param>
@@ -107,7 +108,7 @@ namespace MediaBrowser.Controller.Drawing
         /// <param name="enhancers">The enhancers.</param>
         /// <returns>Task.</returns>
         /// <exception cref="System.ArgumentNullException">entity</exception>
-        public async Task ProcessImage(BaseItem entity, ImageType imageType, int imageIndex, bool cropWhitespace, DateTime dateModified, Stream toStream, int? width, int? height, int? maxWidth, int? maxHeight, int? quality, List<IImageEnhancer> enhancers)
+        public async Task ProcessImage(BaseItem entity, ImageType imageType, int imageIndex, string originalImagePath, bool cropWhitespace, DateTime dateModified, Stream toStream, int? width, int? height, int? maxWidth, int? maxHeight, int? quality, List<IImageEnhancer> enhancers)
         {
             if (entity == null)
             {
@@ -119,8 +120,6 @@ namespace MediaBrowser.Controller.Drawing
                 throw new ArgumentNullException("toStream");
             }
 
-            var originalImagePath = GetImagePath(entity, imageType, imageIndex);
-
             if (cropWhitespace)
             {
                 originalImagePath = await GetCroppedImage(originalImagePath, dateModified).ConfigureAwait(false);