Merge pull request #2676 from GranPC/public-pr/blurhash

Implement Blurhash generation for images

MediaBrowser.Controller/Drawing/IImageEncoder.cs

@@ -43,6 +43,15 @@ namespace MediaBrowser.Controller.Drawing
         /// <returns>The image dimensions.</returns>
         ImageDimensions GetImageSize(string path);
 
+        /// <summary>
+        /// Gets the blurhash of an image.
+        /// </summary>
+        /// <param name="xComp">Amount of X components of DCT to take.</param>
+        /// <param name="yComp">Amount of Y components of DCT to take.</param>
+        /// <param name="path">The filepath of the image.</param>
+        /// <returns>The blurhash.</returns>
+        string GetImageBlurHash(int xComp, int yComp, string path);
+
         /// <summary>
         /// Encode an image.
         /// </summary>

MediaBrowser.Controller/Drawing/IImageProcessor.cs

@@ -40,6 +40,13 @@ namespace MediaBrowser.Controller.Drawing
         /// <returns>ImageDimensions</returns>
         ImageDimensions GetImageDimensions(BaseItem item, ItemImageInfo info);
 
+        /// <summary>
+        /// Gets the blurhash of the image.
+        /// </summary>
+        /// <param name="path">Path to the image file.</param>
+        /// <returns>BlurHash</returns>
+        string GetImageBlurHash(string path);
+
         /// <summary>
         /// Gets the image cache tag.
         /// </summary>
@@ -47,6 +54,7 @@ namespace MediaBrowser.Controller.Drawing
         /// <param name="image">The image.</param>
         /// <returns>Guid.</returns>
         string GetImageCacheTag(BaseItem item, ItemImageInfo image);
+
         string GetImageCacheTag(BaseItem item, ChapterInfo info);
 
         /// <summary>

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -1374,6 +1374,7 @@ namespace MediaBrowser.Controller.Entities
                         new List<FileSystemMetadata>();
 
                     var ownedItemsChanged = await RefreshedOwnedItems(options, files, cancellationToken).ConfigureAwait(false);
+                    LibraryManager.UpdateImages(this); // ensure all image properties in DB are fresh
 
                     if (ownedItemsChanged)
                     {
@@ -2222,6 +2223,7 @@ namespace MediaBrowser.Controller.Entities
                 existingImage.DateModified = image.DateModified;
                 existingImage.Width = image.Width;
                 existingImage.Height = image.Height;
+                existingImage.BlurHash = image.BlurHash;
             }
             else
             {
@@ -2373,6 +2375,46 @@ namespace MediaBrowser.Controller.Entities
                 .ElementAtOrDefault(imageIndex);
         }
 
+        /// <summary>
+        /// Computes image index for given image or raises if no matching image found.
+        /// </summary>
+        /// <param name="image">Image to compute index for.</param>
+        /// <exception cref="ArgumentException">Image index cannot be computed as no matching image found.
+        /// </exception>
+        /// <returns>Image index.</returns>
+        public int GetImageIndex(ItemImageInfo image)
+        {
+            if (image == null)
+            {
+                throw new ArgumentNullException(nameof(image));
+            }
+
+            if (image.Type == ImageType.Chapter)
+            {
+                var chapters = ItemRepository.GetChapters(this);
+                for (var i = 0; i < chapters.Count; i++)
+                {
+                    if (chapters[i].ImagePath == image.Path)
+                    {
+                        return i;
+                    }
+                }
+
+                throw new ArgumentException("No chapter index found for image path", image.Path);
+            }
+
+            var images = GetImages(image.Type).ToArray();
+            for (var i = 0; i < images.Length; i++)
+            {
+                if (images[i].Path == image.Path)
+                {
+                    return i;
+                }
+            }
+
+            throw new ArgumentException("No image index found for image path", image.Path);
+        }
+
         public IEnumerable<ItemImageInfo> GetImages(ImageType imageType)
         {
             if (imageType == ImageType.Chapter)

MediaBrowser.Controller/Entities/Folder.cs

@@ -341,6 +341,11 @@ namespace MediaBrowser.Controller.Entities
                         {
                             currentChild.UpdateToRepository(ItemUpdateType.MetadataImport, cancellationToken);
                         }
+                        else
+                        {
+                            // metadata is up-to-date; make sure DB has correct images dimensions and hash
+                            LibraryManager.UpdateImages(currentChild);
+                        }
 
                         continue;
                     }

MediaBrowser.Controller/Entities/ItemImageInfo.cs

@@ -28,6 +28,12 @@ namespace MediaBrowser.Controller.Entities
 
         public int Height { get; set; }
 
+        /// <summary>
+        /// Gets or sets the blurhash.
+        /// </summary>
+        /// <value>The blurhash.</value>
+        public string BlurHash { get; set; }
+
         [JsonIgnore]
         public bool IsLocalFile => Path == null || !Path.StartsWith("http", StringComparison.OrdinalIgnoreCase);
     }

MediaBrowser.Controller/Library/ILibraryManager.cs

@@ -118,7 +118,7 @@ namespace MediaBrowser.Controller.Library
         /// </summary>
         void QueueLibraryScan();
 
-        void UpdateImages(BaseItem item);
+        void UpdateImages(BaseItem item, bool forceUpdate = false);
 
         /// <summary>
         /// Gets the default view.
@@ -195,6 +195,7 @@ namespace MediaBrowser.Controller.Library
         /// Updates the item.
         /// </summary>
         void UpdateItems(IEnumerable<BaseItem> items, BaseItem parent, ItemUpdateType updateReason, CancellationToken cancellationToken);
+
         void UpdateItem(BaseItem item, BaseItem parent, ItemUpdateType updateReason, CancellationToken cancellationToken);
 
         /// <summary>