support image placeholders

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -1479,6 +1479,7 @@ namespace MediaBrowser.Controller.Entities
 
                 image.Path = file.FullName;
                 image.DateModified = imageInfo.DateModified;
+                image.IsPlaceholder = false;
             }
         }
 

MediaBrowser.Controller/Entities/ItemImageInfo.cs

@@ -24,6 +24,12 @@ namespace MediaBrowser.Controller.Entities
         /// <value>The date modified.</value>
         public DateTime DateModified { get; set; }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether this instance is placeholder.
+        /// </summary>
+        /// <value><c>true</c> if this instance is placeholder; otherwise, <c>false</c>.</value>
+        public bool IsPlaceholder { get; set; }
+
         [IgnoreDataMember]
         public bool IsLocalFile
         {

MediaBrowser.Providers/Manager/ItemImageProvider.cs

@@ -130,7 +130,7 @@ namespace MediaBrowser.Providers.Manager
                 {
                     if (!IsEnabled(savedOptions, imageType, item)) continue;
 
-                    if (!item.HasImage(imageType) || (refreshOptions.IsReplacingImage(imageType) && !downloadedImages.Contains(imageType)))
+                    if (!HasImage(item, imageType) || (refreshOptions.IsReplacingImage(imageType) && !downloadedImages.Contains(imageType)))
                     {
                         _logger.Debug("Running {0} for {1}", provider.GetType().Name, item.Path ?? item.Name);
 
@@ -199,6 +199,14 @@ namespace MediaBrowser.Providers.Manager
             ImageType.Thumb
         };
 
+        private bool HasImage(IHasImages item, ImageType type)
+        {
+            var image = item.GetImageInfo(type, 0);
+
+            // if it's a placeholder image then pretend like it's not there so that we can replace it
+            return image != null && !image.IsPlaceholder;
+        }
+
         /// <summary>
         /// Determines if an item already contains the given images
         /// </summary>
@@ -210,7 +218,7 @@ namespace MediaBrowser.Providers.Manager
         /// <returns><c>true</c> if the specified item contains images; otherwise, <c>false</c>.</returns>
         private bool ContainsImages(IHasImages item, List<ImageType> images, MetadataOptions savedOptions, int backdropLimit, int screenshotLimit)
         {
-            if (_singularImages.Any(i => images.Contains(i) && !item.HasImage(i) && savedOptions.GetLimit(i) > 0))
+            if (_singularImages.Any(i => images.Contains(i) && !HasImage(item, i) && savedOptions.GetLimit(i) > 0))
             {
                 return false;
             }
@@ -282,7 +290,7 @@ namespace MediaBrowser.Providers.Manager
                 {
                     if (!IsEnabled(savedOptions, imageType, item)) continue;
 
-                    if (!item.HasImage(imageType) || (refreshOptions.IsReplacingImage(imageType) && !downloadedImages.Contains(imageType)))
+                    if (!HasImage(item, imageType) || (refreshOptions.IsReplacingImage(imageType) && !downloadedImages.Contains(imageType)))
                     {
                         minWidth = savedOptions.GetMinWidth(imageType);
                         var downloaded = await DownloadImage(item, provider, result, list, minWidth, imageType, cancellationToken).ConfigureAwait(false);
@@ -613,4 +621,4 @@ namespace MediaBrowser.Providers.Manager
             }
         }
     }
-}
+}

MediaBrowser.Server.Implementations/LiveTv/LiveTvManager.cs

@@ -653,13 +653,26 @@ namespace MediaBrowser.Server.Implementations.LiveTv
             item.IndexNumber = info.EpisodeNumber;
             item.ParentIndexNumber = info.SeasonNumber;
 
-            if (!string.IsNullOrWhiteSpace(info.ImagePath))
-            {
-                item.SetImagePath(ImageType.Primary, info.ImagePath);
-            }
-            else if (!string.IsNullOrWhiteSpace(info.ImageUrl))
+            if (!item.HasImage(ImageType.Primary))
             {
-                item.SetImagePath(ImageType.Primary, info.ImageUrl);
+                if (!string.IsNullOrWhiteSpace(info.ImagePath))
+                {
+                    item.SetImage(new ItemImageInfo
+                    {
+                        Path = info.ImagePath,
+                        Type = ImageType.Primary,
+                        IsPlaceholder = true
+                    }, 0);
+                }
+                else if (!string.IsNullOrWhiteSpace(info.ImageUrl))
+                {
+                    item.SetImage(new ItemImageInfo
+                    {
+                        Path = info.ImageUrl,
+                        Type = ImageType.Primary,
+                        IsPlaceholder = true
+                    }, 0);
+                }
             }
             
             if (isNew)