support plex/xbmc conventions for primary images and backdrops

MediaBrowser.Controller/Providers/ImageFromMediaLocationProvider.cs

@@ -146,7 +146,8 @@ namespace MediaBrowser.Controller.Providers
         /// <returns>FileSystemInfo.</returns>
         protected virtual FileSystemInfo GetImage(BaseItem item, string filenameWithoutExtension)
         {
-            return item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.ResolveArgs.Path, filenameWithoutExtension + ".png")) ?? item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.ResolveArgs.Path, filenameWithoutExtension + ".jpg"));
+            return item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.ResolveArgs.Path, filenameWithoutExtension + ".png")) 
+                ?? item.ResolveArgs.GetMetaFileByPath(Path.Combine(item.ResolveArgs.Path, filenameWithoutExtension + ".jpg"));
         }
 
         /// <summary>
@@ -155,11 +156,13 @@ namespace MediaBrowser.Controller.Providers
         /// <param name="item">The item.</param>
         private void PopulateBaseItemImages(BaseItem item)
         {
-            var backdropFiles = new List<string>();
             var screenshotFiles = new List<string>();
 
             // Primary Image
-            var image = GetImage(item, "folder");
+            var image = GetImage(item, "folder") ??
+                GetImage(item, "poster") ??
+                GetImage(item, "cover") ?? 
+                GetImage(item, "default");
 
             if (image != null)
             {
@@ -223,22 +226,25 @@ namespace MediaBrowser.Controller.Providers
             }
 
             // Backdrop Image
-            image = GetImage(item, "backdrop");
+            PopulateBackdrops(item);
+
+            // Screenshot Image
+            image = GetImage(item, "screenshot");
 
             if (image != null)
             {
-                backdropFiles.Add(image.FullName);
+                screenshotFiles.Add(image.FullName);
             }
 
             var unfound = 0;
             for (var i = 1; i <= 20; i++)
             {
-                // Backdrop Image
-                image = GetImage(item, "backdrop" + i);
+                // Screenshot Image
+                image = GetImage(item, "screenshot" + i);
 
                 if (image != null)
                 {
-                    backdropFiles.Add(image.FullName);
+                    screenshotFiles.Add(image.FullName);
                 }
                 else
                 {
@@ -251,28 +257,57 @@ namespace MediaBrowser.Controller.Providers
                 }
             }
 
+            if (screenshotFiles.Count > 0)
+            {
+                item.ScreenshotImagePaths = screenshotFiles;
+            }
+        }
+
+        /// <summary>
+        /// Populates the backdrops.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        private void PopulateBackdrops(BaseItem item)
+        {
+            var backdropFiles = new List<string>();
+
+            PopulateBackdrops(item, backdropFiles, "backdrop", "backdrop");
+
+            // Support plex/xbmc conventions
+            PopulateBackdrops(item, backdropFiles, "fanart", "fanart-");
+            PopulateBackdrops(item, backdropFiles, "background", "background-");
+
             if (backdropFiles.Count > 0)
             {
                 item.BackdropImagePaths = backdropFiles;
             }
+        }
 
-            // Screenshot Image
-            image = GetImage(item, "screenshot");
+        /// <summary>
+        /// Populates the backdrops.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="backdropFiles">The backdrop files.</param>
+        /// <param name="filename">The filename.</param>
+        /// <param name="numberedSuffix">The numbered suffix.</param>
+        private void PopulateBackdrops(BaseItem item, List<string> backdropFiles, string filename, string numberedSuffix)
+        {
+            var image = GetImage(item, filename);
 
             if (image != null)
             {
-                screenshotFiles.Add(image.FullName);
+                backdropFiles.Add(image.FullName);
             }
 
-            unfound = 0;
+            var unfound = 0;
             for (var i = 1; i <= 20; i++)
             {
-                // Screenshot Image
-                image = GetImage(item, "screenshot" + i);
+                // Backdrop Image
+                image = GetImage(item, numberedSuffix + i);
 
                 if (image != null)
                 {
-                    screenshotFiles.Add(image.FullName);
+                    backdropFiles.Add(image.FullName);
                 }
                 else
                 {
@@ -284,11 +319,6 @@ namespace MediaBrowser.Controller.Providers
                     }
                 }
             }
-
-            if (screenshotFiles.Count > 0)
-            {
-                item.ScreenshotImagePaths = screenshotFiles;
-            }
         }
     }
 }