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989 lines
37 KiB
C#
989 lines
37 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Controller;
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using MediaBrowser.Controller.Drawing;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Model.Drawing;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.Drawing
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{
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/// <summary>
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/// Class ImageProcessor
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/// </summary>
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public class ImageProcessor : IImageProcessor, IDisposable
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{
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/// <summary>
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/// The us culture
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/// </summary>
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protected readonly CultureInfo UsCulture = new CultureInfo("en-US");
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/// <summary>
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/// The _cached imaged sizes
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/// </summary>
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private readonly ConcurrentDictionary<Guid, ImageSize> _cachedImagedSizes;
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/// <summary>
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/// Gets the list of currently registered image processors
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/// Image processors are specialized metadata providers that run after the normal ones
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/// </summary>
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/// <value>The image enhancers.</value>
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public IEnumerable<IImageEnhancer> ImageEnhancers { get; private set; }
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/// <summary>
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/// The _logger
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/// </summary>
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private readonly ILogger _logger;
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private readonly IFileSystem _fileSystem;
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private readonly IJsonSerializer _jsonSerializer;
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private readonly IServerApplicationPaths _appPaths;
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private readonly IMediaEncoder _mediaEncoder;
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public ImageProcessor(ILogger logger, IServerApplicationPaths appPaths, IFileSystem fileSystem, IJsonSerializer jsonSerializer, IMediaEncoder mediaEncoder)
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{
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_logger = logger;
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_fileSystem = fileSystem;
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_jsonSerializer = jsonSerializer;
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_mediaEncoder = mediaEncoder;
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_appPaths = appPaths;
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_saveImageSizeTimer = new Timer(SaveImageSizeCallback, null, Timeout.Infinite, Timeout.Infinite);
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Dictionary<Guid, ImageSize> sizeDictionary;
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try
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{
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sizeDictionary = jsonSerializer.DeserializeFromFile<Dictionary<Guid, ImageSize>>(ImageSizeFile) ??
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new Dictionary<Guid, ImageSize>();
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}
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catch (FileNotFoundException)
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{
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// No biggie
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sizeDictionary = new Dictionary<Guid, ImageSize>();
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}
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catch (Exception ex)
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{
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logger.ErrorException("Error parsing image size cache file", ex);
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sizeDictionary = new Dictionary<Guid, ImageSize>();
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}
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_cachedImagedSizes = new ConcurrentDictionary<Guid, ImageSize>(sizeDictionary);
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}
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private string ResizedImageCachePath
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{
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get
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{
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return Path.Combine(_appPaths.ImageCachePath, "resized-images");
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}
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}
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private string EnhancedImageCachePath
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{
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get
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{
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return Path.Combine(_appPaths.ImageCachePath, "enhanced-images");
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}
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}
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private string CroppedWhitespaceImageCachePath
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{
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get
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{
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return Path.Combine(_appPaths.ImageCachePath, "cropped-images");
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}
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}
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public void AddParts(IEnumerable<IImageEnhancer> enhancers)
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{
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ImageEnhancers = enhancers.ToArray();
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}
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public async Task ProcessImage(ImageProcessingOptions options, Stream toStream)
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{
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if (options == null)
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{
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throw new ArgumentNullException("options");
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}
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if (toStream == null)
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{
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throw new ArgumentNullException("toStream");
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}
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var originalImagePath = options.Image.Path;
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if (options.HasDefaultOptions() && options.Enhancers.Count == 0 && !options.CropWhiteSpace)
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{
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// Just spit out the original file if all the options are default
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using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
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return;
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}
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}
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var dateModified = options.Image.DateModified;
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if (options.CropWhiteSpace)
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{
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var tuple = await GetWhitespaceCroppedImage(originalImagePath, dateModified).ConfigureAwait(false);
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originalImagePath = tuple.Item1;
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dateModified = tuple.Item2;
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}
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if (options.Enhancers.Count > 0)
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{
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var tuple = await GetEnhancedImage(options.Image, options.Item, options.ImageIndex, options.Enhancers).ConfigureAwait(false);
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originalImagePath = tuple.Item1;
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dateModified = tuple.Item2;
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}
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var originalImageSize = GetImageSize(originalImagePath, dateModified);
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// Determine the output size based on incoming parameters
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var newSize = DrawingUtils.Resize(originalImageSize, options.Width, options.Height, options.MaxWidth, options.MaxHeight);
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if (options.HasDefaultOptionsWithoutSize() && newSize.Equals(originalImageSize) && options.Enhancers.Count == 0)
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{
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// Just spit out the original file if the new size equals the old
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using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
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return;
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}
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}
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var quality = options.Quality ?? 90;
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var cacheFilePath = GetCacheFilePath(originalImagePath, newSize, quality, dateModified, options.OutputFormat, options.AddPlayedIndicator, options.PercentPlayed, options.UnplayedCount, options.BackgroundColor);
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try
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{
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using (var fileStream = _fileSystem.GetFileStream(cacheFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
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return;
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}
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}
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catch (IOException)
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{
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// Cache file doesn't exist or is currently being written to
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}
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var semaphore = GetLock(cacheFilePath);
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await semaphore.WaitAsync().ConfigureAwait(false);
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// Check again in case of lock contention
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try
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{
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using (var fileStream = _fileSystem.GetFileStream(cacheFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
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semaphore.Release();
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return;
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}
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}
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catch (IOException)
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{
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// Cache file doesn't exist or is currently being written to
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}
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catch
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{
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semaphore.Release();
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throw;
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}
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try
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{
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var hasPostProcessing = !string.IsNullOrEmpty(options.BackgroundColor) || options.UnplayedCount.HasValue || options.AddPlayedIndicator || options.PercentPlayed.HasValue;
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//if (!hasPostProcessing)
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//{
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// using (var outputStream = await _mediaEncoder.EncodeImage(new ImageEncodingOptions
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// {
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// InputPath = originalImagePath,
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// MaxHeight = options.MaxHeight,
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// MaxWidth = options.MaxWidth,
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// Height = options.Height,
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// Width = options.Width,
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// Quality = options.Quality,
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// Format = options.OutputFormat == ImageOutputFormat.Original ? Path.GetExtension(originalImagePath).TrimStart('.') : options.OutputFormat.ToString().ToLower()
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// }, CancellationToken.None).ConfigureAwait(false))
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// {
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// using (var outputMemoryStream = new MemoryStream())
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// {
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// // Save to the memory stream
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// await outputStream.CopyToAsync(outputMemoryStream).ConfigureAwait(false);
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// var bytes = outputMemoryStream.ToArray();
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// await toStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
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// // kick off a task to cache the result
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// await CacheResizedImage(cacheFilePath, bytes).ConfigureAwait(false);
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// }
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// return;
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// }
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//}
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using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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// Copy to memory stream to avoid Image locking file
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using (var memoryStream = new MemoryStream())
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{
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await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
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using (var originalImage = Image.FromStream(memoryStream, true, false))
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{
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var newWidth = Convert.ToInt32(newSize.Width);
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var newHeight = Convert.ToInt32(newSize.Height);
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// Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
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using (var thumbnail = new Bitmap(newWidth, newHeight, PixelFormat.Format32bppPArgb))
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{
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// Mono throw an exeception if assign 0 to SetResolution
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if (originalImage.HorizontalResolution > 0 && originalImage.VerticalResolution > 0)
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{
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// Preserve the original resolution
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thumbnail.SetResolution(originalImage.HorizontalResolution, originalImage.VerticalResolution);
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}
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using (var thumbnailGraph = Graphics.FromImage(thumbnail))
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{
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thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
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thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
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thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
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thumbnailGraph.PixelOffsetMode = PixelOffsetMode.HighQuality;
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thumbnailGraph.CompositingMode = !hasPostProcessing ?
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CompositingMode.SourceCopy :
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CompositingMode.SourceOver;
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SetBackgroundColor(thumbnailGraph, options);
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thumbnailGraph.DrawImage(originalImage, 0, 0, newWidth, newHeight);
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DrawIndicator(thumbnailGraph, newWidth, newHeight, options);
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var outputFormat = GetOutputFormat(originalImage, options.OutputFormat);
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using (var outputMemoryStream = new MemoryStream())
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{
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// Save to the memory stream
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thumbnail.Save(outputFormat, outputMemoryStream, quality);
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var bytes = outputMemoryStream.ToArray();
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await toStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
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// kick off a task to cache the result
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await CacheResizedImage(cacheFilePath, bytes).ConfigureAwait(false);
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}
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}
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}
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}
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}
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}
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}
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finally
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{
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semaphore.Release();
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}
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}
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/// <summary>
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/// Caches the resized image.
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/// </summary>
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/// <param name="cacheFilePath">The cache file path.</param>
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/// <param name="bytes">The bytes.</param>
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/// <returns>Task.</returns>
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private async Task CacheResizedImage(string cacheFilePath, byte[] bytes)
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{
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try
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{
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var parentPath = Path.GetDirectoryName(cacheFilePath);
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Directory.CreateDirectory(parentPath);
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// Save to the cache location
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using (var cacheFileStream = _fileSystem.GetFileStream(cacheFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, true))
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{
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// Save to the filestream
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await cacheFileStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
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}
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error writing to image cache file {0}", ex, cacheFilePath);
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}
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}
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/// <summary>
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/// Sets the color of the background.
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/// </summary>
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/// <param name="graphics">The graphics.</param>
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/// <param name="options">The options.</param>
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private void SetBackgroundColor(Graphics graphics, ImageProcessingOptions options)
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{
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var color = options.BackgroundColor;
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if (!string.IsNullOrEmpty(color))
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{
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Color drawingColor;
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try
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{
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drawingColor = ColorTranslator.FromHtml(color);
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}
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catch
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{
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drawingColor = ColorTranslator.FromHtml("#" + color);
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}
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graphics.Clear(drawingColor);
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}
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}
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/// <summary>
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/// Draws the indicator.
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/// </summary>
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/// <param name="graphics">The graphics.</param>
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/// <param name="imageWidth">Width of the image.</param>
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/// <param name="imageHeight">Height of the image.</param>
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/// <param name="options">The options.</param>
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private void DrawIndicator(Graphics graphics, int imageWidth, int imageHeight, ImageProcessingOptions options)
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{
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if (!options.AddPlayedIndicator && !options.UnplayedCount.HasValue && !options.PercentPlayed.HasValue)
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{
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return;
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}
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try
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{
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if (options.AddPlayedIndicator)
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{
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var currentImageSize = new Size(imageWidth, imageHeight);
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new PlayedIndicatorDrawer().DrawPlayedIndicator(graphics, currentImageSize);
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}
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else if (options.UnplayedCount.HasValue)
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{
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var currentImageSize = new Size(imageWidth, imageHeight);
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new UnplayedCountIndicator().DrawUnplayedCountIndicator(graphics, currentImageSize, options.UnplayedCount.Value);
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}
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if (options.PercentPlayed.HasValue)
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{
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var currentImageSize = new Size(imageWidth, imageHeight);
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new PercentPlayedDrawer().Process(graphics, currentImageSize, options.PercentPlayed.Value);
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}
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error drawing indicator overlay", ex);
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}
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}
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/// <summary>
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/// Gets the output format.
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/// </summary>
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/// <param name="image">The image.</param>
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/// <param name="outputFormat">The output format.</param>
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/// <returns>ImageFormat.</returns>
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private System.Drawing.Imaging.ImageFormat GetOutputFormat(Image image, ImageOutputFormat outputFormat)
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{
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switch (outputFormat)
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{
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case ImageOutputFormat.Bmp:
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return System.Drawing.Imaging.ImageFormat.Bmp;
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case ImageOutputFormat.Gif:
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return System.Drawing.Imaging.ImageFormat.Gif;
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case ImageOutputFormat.Jpg:
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return System.Drawing.Imaging.ImageFormat.Jpeg;
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case ImageOutputFormat.Png:
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return System.Drawing.Imaging.ImageFormat.Png;
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default:
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return image.RawFormat;
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}
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}
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/// <summary>
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/// Crops whitespace from an image, caches the result, and returns the cached path
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/// </summary>
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/// <param name="originalImagePath">The original image path.</param>
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/// <param name="dateModified">The date modified.</param>
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/// <returns>System.String.</returns>
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private async Task<Tuple<string, DateTime>> GetWhitespaceCroppedImage(string originalImagePath, DateTime dateModified)
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{
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var name = originalImagePath;
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name += "datemodified=" + dateModified.Ticks;
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var croppedImagePath = GetCachePath(CroppedWhitespaceImageCachePath, name, Path.GetExtension(originalImagePath));
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var semaphore = GetLock(croppedImagePath);
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await semaphore.WaitAsync().ConfigureAwait(false);
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// Check again in case of contention
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if (File.Exists(croppedImagePath))
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{
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semaphore.Release();
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return new Tuple<string, DateTime>(croppedImagePath, _fileSystem.GetLastWriteTimeUtc(croppedImagePath));
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}
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try
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{
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using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
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{
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// Copy to memory stream to avoid Image locking file
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using (var memoryStream = new MemoryStream())
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{
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await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
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using (var originalImage = (Bitmap)Image.FromStream(memoryStream, true, false))
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{
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var outputFormat = originalImage.RawFormat;
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using (var croppedImage = originalImage.CropWhitespace())
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{
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Directory.CreateDirectory(Path.GetDirectoryName(croppedImagePath));
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using (var outputStream = _fileSystem.GetFileStream(croppedImagePath, FileMode.Create, FileAccess.Write, FileShare.Read, false))
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{
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croppedImage.Save(outputFormat, outputStream, 100);
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}
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}
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}
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}
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}
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}
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catch (Exception ex)
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{
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// We have to have a catch-all here because some of the .net image methods throw a plain old Exception
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_logger.ErrorException("Error cropping image {0}", ex, originalImagePath);
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return new Tuple<string, DateTime>(originalImagePath, dateModified);
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}
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finally
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{
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semaphore.Release();
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}
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return new Tuple<string, DateTime>(croppedImagePath, _fileSystem.GetLastWriteTimeUtc(croppedImagePath));
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}
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/// <summary>
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/// Increment this when indicator drawings change
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/// </summary>
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private const string IndicatorVersion = "2";
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/// <summary>
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/// Gets the cache file path based on a set of parameters
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/// </summary>
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private string GetCacheFilePath(string originalPath, ImageSize outputSize, int quality, DateTime dateModified, ImageOutputFormat format, bool addPlayedIndicator, double? percentPlayed, int? unwatchedCount, string backgroundColor)
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{
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var filename = originalPath;
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filename += "width=" + outputSize.Width;
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filename += "height=" + outputSize.Height;
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filename += "quality=" + quality;
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filename += "datemodified=" + dateModified.Ticks;
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if (format != ImageOutputFormat.Original)
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{
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filename += "f=" + format;
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}
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var hasIndicator = false;
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if (addPlayedIndicator)
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{
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filename += "pl=true";
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hasIndicator = true;
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}
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if (percentPlayed.HasValue)
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{
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filename += "p=" + percentPlayed.Value;
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hasIndicator = true;
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}
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if (unwatchedCount.HasValue)
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{
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filename += "p=" + unwatchedCount.Value;
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hasIndicator = true;
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}
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if (hasIndicator)
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{
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filename += "iv=" + IndicatorVersion;
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}
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if (!string.IsNullOrEmpty(backgroundColor))
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{
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filename += "b=" + backgroundColor;
|
|
}
|
|
|
|
return GetCachePath(ResizedImageCachePath, filename, Path.GetExtension(originalPath));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the size of the image.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <returns>ImageSize.</returns>
|
|
public ImageSize GetImageSize(string path)
|
|
{
|
|
return GetImageSize(path, File.GetLastWriteTimeUtc(path));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the size of the image.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <param name="imageDateModified">The image date modified.</param>
|
|
/// <returns>ImageSize.</returns>
|
|
/// <exception cref="System.ArgumentNullException">path</exception>
|
|
public ImageSize GetImageSize(string path, DateTime imageDateModified)
|
|
{
|
|
if (string.IsNullOrEmpty(path))
|
|
{
|
|
throw new ArgumentNullException("path");
|
|
}
|
|
|
|
var name = path + "datemodified=" + imageDateModified.Ticks;
|
|
|
|
ImageSize size;
|
|
|
|
var cacheHash = name.GetMD5();
|
|
|
|
if (!_cachedImagedSizes.TryGetValue(cacheHash, out size))
|
|
{
|
|
size = GetImageSizeInternal(path);
|
|
|
|
_cachedImagedSizes.AddOrUpdate(cacheHash, size, (keyName, oldValue) => size);
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the image size internal.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <returns>ImageSize.</returns>
|
|
private ImageSize GetImageSizeInternal(string path)
|
|
{
|
|
var size = ImageHeader.GetDimensions(path, _logger, _fileSystem);
|
|
|
|
StartSaveImageSizeTimer();
|
|
|
|
return new ImageSize { Width = size.Width, Height = size.Height };
|
|
}
|
|
|
|
private readonly Timer _saveImageSizeTimer;
|
|
private const int SaveImageSizeTimeout = 5000;
|
|
private readonly object _saveImageSizeLock = new object();
|
|
private void StartSaveImageSizeTimer()
|
|
{
|
|
_saveImageSizeTimer.Change(SaveImageSizeTimeout, Timeout.Infinite);
|
|
}
|
|
|
|
private void SaveImageSizeCallback(object state)
|
|
{
|
|
lock (_saveImageSizeLock)
|
|
{
|
|
try
|
|
{
|
|
var path = ImageSizeFile;
|
|
Directory.CreateDirectory(Path.GetDirectoryName(path));
|
|
_jsonSerializer.SerializeToFile(_cachedImagedSizes, path);
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.ErrorException("Error saving image size file", ex);
|
|
}
|
|
}
|
|
}
|
|
|
|
private string ImageSizeFile
|
|
{
|
|
get
|
|
{
|
|
return Path.Combine(_appPaths.DataPath, "imagesizes.json");
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the image cache tag.
|
|
/// </summary>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="image">The image.</param>
|
|
/// <returns>Guid.</returns>
|
|
/// <exception cref="System.ArgumentNullException">item</exception>
|
|
public string GetImageCacheTag(IHasImages item, ItemImageInfo image)
|
|
{
|
|
if (item == null)
|
|
{
|
|
throw new ArgumentNullException("item");
|
|
}
|
|
|
|
if (image == null)
|
|
{
|
|
throw new ArgumentNullException("image");
|
|
}
|
|
|
|
var supportedEnhancers = GetSupportedEnhancers(item, image.Type);
|
|
|
|
return GetImageCacheTag(item, image, supportedEnhancers.ToList());
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the image cache tag.
|
|
/// </summary>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="image">The image.</param>
|
|
/// <param name="imageEnhancers">The image enhancers.</param>
|
|
/// <returns>Guid.</returns>
|
|
/// <exception cref="System.ArgumentNullException">item</exception>
|
|
public string GetImageCacheTag(IHasImages item, ItemImageInfo image, List<IImageEnhancer> imageEnhancers)
|
|
{
|
|
if (item == null)
|
|
{
|
|
throw new ArgumentNullException("item");
|
|
}
|
|
|
|
if (imageEnhancers == null)
|
|
{
|
|
throw new ArgumentNullException("imageEnhancers");
|
|
}
|
|
|
|
if (image == null)
|
|
{
|
|
throw new ArgumentNullException("image");
|
|
}
|
|
|
|
var originalImagePath = image.Path;
|
|
var dateModified = image.DateModified;
|
|
var imageType = image.Type;
|
|
|
|
// Optimization
|
|
if (imageEnhancers.Count == 0)
|
|
{
|
|
return (originalImagePath + dateModified.Ticks).GetMD5().ToString("N");
|
|
}
|
|
|
|
// Cache name is created with supported enhancers combined with the last config change so we pick up new config changes
|
|
var cacheKeys = imageEnhancers.Select(i => i.GetConfigurationCacheKey(item, imageType)).ToList();
|
|
cacheKeys.Add(originalImagePath + dateModified.Ticks);
|
|
|
|
return string.Join("|", cacheKeys.ToArray()).GetMD5().ToString("N");
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the enhanced image.
|
|
/// </summary>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="imageType">Type of the image.</param>
|
|
/// <param name="imageIndex">Index of the image.</param>
|
|
/// <returns>Task{System.String}.</returns>
|
|
public async Task<string> GetEnhancedImage(IHasImages item, ImageType imageType, int imageIndex)
|
|
{
|
|
var enhancers = GetSupportedEnhancers(item, imageType).ToList();
|
|
|
|
var imageInfo = item.GetImageInfo(imageType, imageIndex);
|
|
|
|
var result = await GetEnhancedImage(imageInfo, item, imageIndex, enhancers);
|
|
|
|
return result.Item1;
|
|
}
|
|
|
|
private async Task<Tuple<string, DateTime>> GetEnhancedImage(ItemImageInfo image,
|
|
IHasImages item,
|
|
int imageIndex,
|
|
List<IImageEnhancer> enhancers)
|
|
{
|
|
var originalImagePath = image.Path;
|
|
var dateModified = image.DateModified;
|
|
var imageType = image.Type;
|
|
|
|
try
|
|
{
|
|
var cacheGuid = GetImageCacheTag(item, image, enhancers);
|
|
|
|
// Enhance if we have enhancers
|
|
var ehnancedImagePath = await GetEnhancedImageInternal(originalImagePath, item, imageType, imageIndex, enhancers, cacheGuid).ConfigureAwait(false);
|
|
|
|
// If the path changed update dateModified
|
|
if (!ehnancedImagePath.Equals(originalImagePath, StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
dateModified = _fileSystem.GetLastWriteTimeUtc(ehnancedImagePath);
|
|
|
|
return new Tuple<string, DateTime>(ehnancedImagePath, dateModified);
|
|
}
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.Error("Error enhancing image", ex);
|
|
}
|
|
|
|
return new Tuple<string, DateTime>(originalImagePath, dateModified);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Runs an image through the image enhancers, caches the result, and returns the cached path
|
|
/// </summary>
|
|
/// <param name="originalImagePath">The original image path.</param>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="imageType">Type of the image.</param>
|
|
/// <param name="imageIndex">Index of the image.</param>
|
|
/// <param name="supportedEnhancers">The supported enhancers.</param>
|
|
/// <param name="cacheGuid">The cache unique identifier.</param>
|
|
/// <returns>System.String.</returns>
|
|
/// <exception cref="System.ArgumentNullException">originalImagePath</exception>
|
|
private async Task<string> GetEnhancedImageInternal(string originalImagePath,
|
|
IHasImages item,
|
|
ImageType imageType,
|
|
int imageIndex,
|
|
IEnumerable<IImageEnhancer> supportedEnhancers,
|
|
string cacheGuid)
|
|
{
|
|
if (string.IsNullOrEmpty(originalImagePath))
|
|
{
|
|
throw new ArgumentNullException("originalImagePath");
|
|
}
|
|
|
|
if (item == null)
|
|
{
|
|
throw new ArgumentNullException("item");
|
|
}
|
|
|
|
// All enhanced images are saved as png to allow transparency
|
|
var enhancedImagePath = GetCachePath(EnhancedImageCachePath, cacheGuid + ".png");
|
|
|
|
var semaphore = GetLock(enhancedImagePath);
|
|
|
|
await semaphore.WaitAsync().ConfigureAwait(false);
|
|
|
|
// Check again in case of contention
|
|
if (File.Exists(enhancedImagePath))
|
|
{
|
|
semaphore.Release();
|
|
return enhancedImagePath;
|
|
}
|
|
|
|
try
|
|
{
|
|
using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
|
|
{
|
|
// Copy to memory stream to avoid Image locking file
|
|
using (var memoryStream = new MemoryStream())
|
|
{
|
|
await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
|
|
|
|
using (var originalImage = Image.FromStream(memoryStream, true, false))
|
|
{
|
|
//Pass the image through registered enhancers
|
|
using (var newImage = await ExecuteImageEnhancers(supportedEnhancers, originalImage, item, imageType, imageIndex).ConfigureAwait(false))
|
|
{
|
|
var parentDirectory = Path.GetDirectoryName(enhancedImagePath);
|
|
|
|
Directory.CreateDirectory(parentDirectory);
|
|
|
|
//And then save it in the cache
|
|
using (var outputStream = _fileSystem.GetFileStream(enhancedImagePath, FileMode.Create, FileAccess.Write, FileShare.Read, false))
|
|
{
|
|
newImage.Save(System.Drawing.Imaging.ImageFormat.Png, outputStream, 100);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
semaphore.Release();
|
|
}
|
|
|
|
return enhancedImagePath;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Executes the image enhancers.
|
|
/// </summary>
|
|
/// <param name="imageEnhancers">The image enhancers.</param>
|
|
/// <param name="originalImage">The original image.</param>
|
|
/// <param name="item">The item.</param>
|
|
/// <param name="imageType">Type of the image.</param>
|
|
/// <param name="imageIndex">Index of the image.</param>
|
|
/// <returns>Task{EnhancedImage}.</returns>
|
|
private async Task<Image> ExecuteImageEnhancers(IEnumerable<IImageEnhancer> imageEnhancers, Image originalImage, IHasImages item, ImageType imageType, int imageIndex)
|
|
{
|
|
var result = originalImage;
|
|
|
|
// Run the enhancers sequentially in order of priority
|
|
foreach (var enhancer in imageEnhancers)
|
|
{
|
|
var typeName = enhancer.GetType().Name;
|
|
|
|
try
|
|
{
|
|
result = await enhancer.EnhanceImageAsync(item, result, imageType, imageIndex).ConfigureAwait(false);
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.ErrorException("{0} failed enhancing {1}", ex, typeName, item.Name);
|
|
|
|
throw;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/// <summary>
|
|
/// The _semaphoreLocks
|
|
/// </summary>
|
|
private readonly ConcurrentDictionary<string, object> _locks = new ConcurrentDictionary<string, object>();
|
|
|
|
/// <summary>
|
|
/// Gets the lock.
|
|
/// </summary>
|
|
/// <param name="filename">The filename.</param>
|
|
/// <returns>System.Object.</returns>
|
|
private object GetObjectLock(string filename)
|
|
{
|
|
return _locks.GetOrAdd(filename, key => new object());
|
|
}
|
|
|
|
/// <summary>
|
|
/// The _semaphoreLocks
|
|
/// </summary>
|
|
private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks = new ConcurrentDictionary<string, SemaphoreSlim>();
|
|
|
|
/// <summary>
|
|
/// Gets the lock.
|
|
/// </summary>
|
|
/// <param name="filename">The filename.</param>
|
|
/// <returns>System.Object.</returns>
|
|
private SemaphoreSlim GetLock(string filename)
|
|
{
|
|
return _semaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the cache path.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <param name="uniqueName">Name of the unique.</param>
|
|
/// <param name="fileExtension">The file extension.</param>
|
|
/// <returns>System.String.</returns>
|
|
/// <exception cref="System.ArgumentNullException">
|
|
/// path
|
|
/// or
|
|
/// uniqueName
|
|
/// or
|
|
/// fileExtension
|
|
/// </exception>
|
|
public string GetCachePath(string path, string uniqueName, string fileExtension)
|
|
{
|
|
if (string.IsNullOrEmpty(path))
|
|
{
|
|
throw new ArgumentNullException("path");
|
|
}
|
|
if (string.IsNullOrEmpty(uniqueName))
|
|
{
|
|
throw new ArgumentNullException("uniqueName");
|
|
}
|
|
|
|
if (string.IsNullOrEmpty(fileExtension))
|
|
{
|
|
throw new ArgumentNullException("fileExtension");
|
|
}
|
|
|
|
var filename = uniqueName.GetMD5() + fileExtension;
|
|
|
|
return GetCachePath(path, filename);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the cache path.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <param name="filename">The filename.</param>
|
|
/// <returns>System.String.</returns>
|
|
/// <exception cref="System.ArgumentNullException">
|
|
/// path
|
|
/// or
|
|
/// filename
|
|
/// </exception>
|
|
public string GetCachePath(string path, string filename)
|
|
{
|
|
if (string.IsNullOrEmpty(path))
|
|
{
|
|
throw new ArgumentNullException("path");
|
|
}
|
|
if (string.IsNullOrEmpty(filename))
|
|
{
|
|
throw new ArgumentNullException("filename");
|
|
}
|
|
|
|
var prefix = filename.Substring(0, 1);
|
|
|
|
path = Path.Combine(path, prefix);
|
|
|
|
return Path.Combine(path, filename);
|
|
}
|
|
|
|
public IEnumerable<IImageEnhancer> GetSupportedEnhancers(IHasImages item, ImageType imageType)
|
|
{
|
|
return ImageEnhancers.Where(i =>
|
|
{
|
|
try
|
|
{
|
|
return i.Supports(item, imageType);
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
_logger.ErrorException("Error in image enhancer: {0}", ex, i.GetType().Name);
|
|
|
|
return false;
|
|
}
|
|
|
|
});
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
_saveImageSizeTimer.Dispose();
|
|
}
|
|
}
|
|
}
|