2 files changed, 219 insertions, 0 deletions
diff --git a/MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj b/MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj
index 58c8ef995b..af9c7563be 100644
--- a/MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj
+++ b/MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj
@@ -226,6 +226,7 @@
     <Compile Include="Persistence\SqliteShrinkMemoryTimer.cs" />
     <Compile Include="Persistence\TypeMapper.cs" />
     <Compile Include="Playlists\ManualPlaylistsFolder.cs" />
+    <Compile Include="Playlists\PlaylistImageEnhancer.cs" />
     <Compile Include="Playlists\PlaylistManager.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ScheduledTasks\PeopleValidationTask.cs" />
diff --git a/MediaBrowser.Server.Implementations/Playlists/PlaylistImageEnhancer.cs b/MediaBrowser.Server.Implementations/Playlists/PlaylistImageEnhancer.cs
new file mode 100644
index 0000000000..768d372647
--- /dev/null
+++ b/MediaBrowser.Server.Implementations/Playlists/PlaylistImageEnhancer.cs
@@ -0,0 +1,218 @@
+using MediaBrowser.Common.IO;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Controller.Entities.TV;
+using MediaBrowser.Controller.Playlists;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Drawing;
+using MediaBrowser.Model.Entities;
+using MoreLinq;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Server.Implementations.Playlists
+{
+    public class PlaylistImageEnhancer : IImageEnhancer
+    {
+        private readonly IFileSystem _fileSystem;
+
+        public PlaylistImageEnhancer(IFileSystem fileSystem)
+        {
+            _fileSystem = fileSystem;
+        }
+
+        public bool Supports(IHasImages item, ImageType imageType)
+        {
+            return imageType == ImageType.Primary && item is Playlist;
+        }
+
+        public MetadataProviderPriority Priority
+        {
+            get { return MetadataProviderPriority.First; }
+        }
+
+        private List<BaseItem> GetItemsWithImages(IHasImages item)
+        {
+            var playlist = (Playlist)item;
+
+            var items = playlist.GetManageableItems()
+                .Select(i =>
+                {
+                    var subItem = i.Item2;
+
+                    var episode = subItem as Episode;
+
+                    if (episode != null)
+                    {
+                        var series = episode.Series;
+                        if (series != null && series.HasImage(ImageType.Primary))
+                        {
+                            return series;
+                        }
+                    }
+
+                    if (subItem.HasImage(ImageType.Primary))
+                    {
+                        return subItem;
+                    }
+
+                    var parent = subItem.Parent;
+
+                    if (parent != null && parent.HasImage(ImageType.Primary))
+                    {
+                        if (parent is MusicAlbum)
+                        {
+                            return parent;
+                        }
+                    }
+
+                    return null;
+                })
+                .Where(i => i != null)
+                .DistinctBy(i => i.Id)
+                .OrderBy(i => Guid.NewGuid())
+                .Take(4)
+                .OrderBy(i => i.Name)
+                .ToList();
+
+            if (items.Count == 0)
+            {
+                return new List<BaseItem>();
+            }
+
+            return items;
+        }
+
+        private const string Version = "3";
+
+        public string GetConfigurationCacheKey(List<BaseItem> items)
+        {
+            return Version + "_" + string.Join(",", items.Select(i => i.Id.ToString("N")).ToArray());
+        }
+
+        public string GetConfigurationCacheKey(IHasImages item, ImageType imageType)
+        {
+            var items = GetItemsWithImages(item);
+
+            return GetConfigurationCacheKey(items);
+        }
+
+        private const int ImageSize = 800;
+
+        public ImageSize GetEnhancedImageSize(IHasImages item, ImageType imageType, int imageIndex, ImageSize originalImageSize)
+        {
+            var items = GetItemsWithImages(item);
+
+            if (items.Count == 0)
+            {
+                return originalImageSize;
+            }
+
+            return new ImageSize
+            {
+                Height = ImageSize,
+                Width = ImageSize
+            };
+        }
+
+        public async Task<Image> EnhanceImageAsync(IHasImages item, Image originalImage, ImageType imageType, int imageIndex)
+        {
+            var items = GetItemsWithImages(item);
+
+            if (items.Count == 0)
+            {
+                return originalImage;
+            }
+
+            var img = await GetCollage(items).ConfigureAwait(false);
+
+            using (originalImage)
+            {
+                return img;
+            }
+        }
+
+        private Task<Image> GetCollage(List<BaseItem> items)
+        {
+            return GetCollage(items.Select(i => i.GetImagePath(ImageType.Primary)).ToList());
+        }
+
+        private async Task<Image> GetCollage(List<string> files)
+        {
+            if (files.Count < 4)
+            {
+                return await GetSingleImage(files).ConfigureAwait(false);
+            }
+
+            const int rows = 2;
+            const int cols = 2;
+
+            const int singleSize = ImageSize / 2;
+            var index = 0;
+
+            var img = new Bitmap(ImageSize, ImageSize, PixelFormat.Format32bppPArgb);
+
+            using (var graphics = Graphics.FromImage(img))
+            {
+                graphics.CompositingQuality = CompositingQuality.HighQuality;
+                graphics.SmoothingMode = SmoothingMode.HighQuality;
+                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
+                graphics.CompositingMode = CompositingMode.SourceCopy;
+
+                for (var row = 0; row < rows; row++)
+                {
+                    for (var col = 0; col < cols; col++)
+                    {
+                        var x = col * singleSize;
+                        var y = row * singleSize;
+
+                        using (var fileStream = _fileSystem.GetFileStream(files[index], FileMode.Open, FileAccess.Read, FileShare.Read, true))
+                        {
+                            using (var memoryStream = new MemoryStream())
+                            {
+                                await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
+
+                                memoryStream.Position = 0;
+
+                                using (var imgtemp = Image.FromStream(memoryStream, true, false))
+                                {
+                                    graphics.DrawImage(imgtemp, x, y, singleSize, singleSize);
+                                }
+                            }
+                        }
+
+                        index++;
+                    }
+                }
+            }
+
+            return img;
+        }
+
+        private Task<Image> GetSingleImage(List<string> files)
+        {
+            return GetImage(files[0]);
+        }
+
+        private async Task<Image> GetImage(string file)
+        {
+            using (var fileStream = _fileSystem.GetFileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read, true))
+            {
+                var memoryStream = new MemoryStream();
+
+                await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
+
+                memoryStream.Position = 0;
+
+                return Image.FromStream(memoryStream, true, false);
+            }
+        }
+    }
+}