jellyfin/Emby.Drawing/ImageProcessor.cs

923 lines
32 KiB
C#
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Controller;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Drawing;
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using MediaBrowser.Model.Entities;
using Microsoft.Extensions.Logging;
using MediaBrowser.Model.Serialization;
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using System;
using System.Collections.Concurrent;
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using System.Collections.Generic;
using System.Globalization;
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using System.IO;
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using System.Linq;
using System.Threading;
using System.Threading.Tasks;
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using MediaBrowser.Model.IO;
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using Emby.Drawing.Common;
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using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Model.Net;
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using MediaBrowser.Model.Threading;
using MediaBrowser.Model.Extensions;
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namespace Emby.Drawing
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{
/// <summary>
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/// Class ImageProcessor
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/// </summary>
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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/// Gets the list of currently registered image processors
/// 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 IImageEnhancer[] ImageEnhancers { get; private set; }
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/// <summary>
/// The _logger
/// </summary>
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
private readonly IJsonSerializer _jsonSerializer;
private readonly IServerApplicationPaths _appPaths;
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private IImageEncoder _imageEncoder;
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private readonly Func<ILibraryManager> _libraryManager;
private readonly Func<IMediaEncoder> _mediaEncoder;
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public ImageProcessor(ILogger logger,
IServerApplicationPaths appPaths,
IFileSystem fileSystem,
IJsonSerializer jsonSerializer,
IImageEncoder imageEncoder,
Func<ILibraryManager> libraryManager, ITimerFactory timerFactory, Func<IMediaEncoder> mediaEncoder)
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{
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_logger = logger;
_fileSystem = fileSystem;
_jsonSerializer = jsonSerializer;
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_imageEncoder = imageEncoder;
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_libraryManager = libraryManager;
_mediaEncoder = mediaEncoder;
_appPaths = appPaths;
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ImageEnhancers = new IImageEnhancer[] { };
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ImageHelper.ImageProcessor = this;
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}
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public IImageEncoder ImageEncoder
{
get { return _imageEncoder; }
set
{
if (value == null)
{
throw new ArgumentNullException("value");
}
_imageEncoder = value;
}
}
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public string[] SupportedInputFormats
{
get
{
return new string[]
{
"tiff",
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"tif",
"jpeg",
"jpg",
"png",
"aiff",
"cr2",
"crw",
// Remove until supported
//"nef",
"orf",
"pef",
"arw",
"webp",
"gif",
"bmp",
"erf",
"raf",
"rw2",
"nrw",
"dng",
"ico",
"astc",
"ktx",
"pkm",
"wbmp"
};
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}
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}
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public bool SupportsImageCollageCreation
{
get
{
return _imageEncoder.SupportsImageCollageCreation;
}
}
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private string ResizedImageCachePath
{
get
{
return Path.Combine(_appPaths.ImageCachePath, "resized-images");
}
}
private string EnhancedImageCachePath
{
get
{
return Path.Combine(_appPaths.ImageCachePath, "enhanced-images");
}
}
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public void AddParts(IEnumerable<IImageEnhancer> enhancers)
{
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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var file = await ProcessImage(options).ConfigureAwait(false);
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using (var fileStream = _fileSystem.GetFileStream(file.Item1, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read, true))
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{
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await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
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}
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}
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public ImageFormat[] GetSupportedImageOutputFormats()
{
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return _imageEncoder.SupportedOutputFormats;
}
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private readonly string[] TransparentImageTypes = new string[] { ".png", ".webp", ".gif" };
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public bool SupportsTransparency(string path)
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{
return TransparentImageTypes.Contains(Path.GetExtension(path) ?? string.Empty);
}
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public async Task<Tuple<string, string, DateTime>> ProcessImage(ImageProcessingOptions options)
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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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var originalImage = options.Image;
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var item = options.Item;
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if (!originalImage.IsLocalFile)
{
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if (item == null)
{
item = _libraryManager().GetItemById(options.ItemId);
}
originalImage = await _libraryManager().ConvertImageToLocal(item, originalImage, options.ImageIndex).ConfigureAwait(false);
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}
var originalImagePath = originalImage.Path;
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var dateModified = originalImage.DateModified;
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var originalImageSize = originalImage.Width > 0 && originalImage.Height > 0 ? new ImageSize(originalImage.Width, originalImage.Height) : (ImageSize?)null;
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if (!_imageEncoder.SupportsImageEncoding)
{
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return new Tuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
}
var supportedImageInfo = await GetSupportedImage(originalImagePath, dateModified).ConfigureAwait(false);
originalImagePath = supportedImageInfo.Item1;
dateModified = supportedImageInfo.Item2;
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var requiresTransparency = TransparentImageTypes.Contains(Path.GetExtension(originalImagePath) ?? string.Empty);
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if (options.Enhancers.Length > 0)
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{
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if (item == null)
{
item = _libraryManager().GetItemById(options.ItemId);
}
var tuple = await GetEnhancedImage(new ItemImageInfo
{
DateModified = dateModified,
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Type = originalImage.Type,
Path = originalImagePath
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}, requiresTransparency, item, options.ImageIndex, options.Enhancers, CancellationToken.None).ConfigureAwait(false);
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originalImagePath = tuple.Item1;
dateModified = tuple.Item2;
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requiresTransparency = tuple.Item3;
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// TODO: Get this info
originalImageSize = null;
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}
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var photo = item as Photo;
var autoOrient = false;
ImageOrientation? orientation = null;
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if (photo != null)
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{
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if (photo.Orientation.HasValue)
{
if (photo.Orientation.Value != ImageOrientation.TopLeft)
{
autoOrient = true;
orientation = photo.Orientation;
}
}
else
{
// Orientation unknown, so do it
autoOrient = true;
orientation = photo.Orientation;
}
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}
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if (options.HasDefaultOptions(originalImagePath, originalImageSize) && (!autoOrient || !options.RequiresAutoOrientation))
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{
// Just spit out the original file if all the options are default
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return new Tuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
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}
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//ImageSize? originalImageSize = GetSavedImageSize(originalImagePath, dateModified);
//if (originalImageSize.HasValue && options.HasDefaultOptions(originalImagePath, originalImageSize.Value) && !autoOrient)
//{
// // Just spit out the original file if all the options are default
// _logger.LogInformation("Returning original image {0}", originalImagePath);
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// return new ValueTuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
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//}
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var newSize = ImageHelper.GetNewImageSize(options, null);
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var quality = options.Quality;
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var outputFormat = GetOutputFormat(options.SupportedOutputFormats, requiresTransparency);
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var cacheFilePath = GetCacheFilePath(originalImagePath, newSize, quality, dateModified, outputFormat, options.AddPlayedIndicator, options.PercentPlayed, options.UnplayedCount, options.Blur, options.BackgroundColor, options.ForegroundLayer);
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CheckDisposed();
var lockInfo = GetLock(cacheFilePath);
await lockInfo.Lock.WaitAsync().ConfigureAwait(false);
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try
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{
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if (!_fileSystem.FileExists(cacheFilePath))
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{
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if (options.CropWhiteSpace && !SupportsTransparency(originalImagePath))
{
options.CropWhiteSpace = false;
}
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var resultPath = _imageEncoder.EncodeImage(originalImagePath, dateModified, cacheFilePath, autoOrient, orientation, quality, options, outputFormat);
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if (string.Equals(resultPath, originalImagePath, StringComparison.OrdinalIgnoreCase))
{
return new Tuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
}
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return new Tuple<string, string, DateTime>(cacheFilePath, GetMimeType(outputFormat, cacheFilePath), _fileSystem.GetLastWriteTimeUtc(cacheFilePath));
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}
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return new Tuple<string, string, DateTime>(cacheFilePath, GetMimeType(outputFormat, cacheFilePath), _fileSystem.GetLastWriteTimeUtc(cacheFilePath));
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}
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catch (ArgumentOutOfRangeException ex)
{
// Decoder failed to decode it
#if DEBUG
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_logger.LogError(ex, "Error encoding image");
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#endif
// Just spit out the original file if all the options are default
return new Tuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
}
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catch (Exception ex)
{
// If it fails for whatever reason, return the original image
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_logger.LogError(ex, "Error encoding image");
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// Just spit out the original file if all the options are default
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return new Tuple<string, string, DateTime>(originalImagePath, MimeTypes.GetMimeType(originalImagePath), dateModified);
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}
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finally
{
ReleaseLock(cacheFilePath, lockInfo);
}
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}
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private ImageFormat GetOutputFormat(ImageFormat[] clientSupportedFormats, bool requiresTransparency)
{
var serverFormats = GetSupportedImageOutputFormats();
// Client doesn't care about format, so start with webp if supported
if (serverFormats.Contains(ImageFormat.Webp) && clientSupportedFormats.Contains(ImageFormat.Webp))
{
return ImageFormat.Webp;
}
// If transparency is needed and webp isn't supported, than png is the only option
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if (requiresTransparency && clientSupportedFormats.Contains(ImageFormat.Png))
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{
return ImageFormat.Png;
}
foreach (var format in clientSupportedFormats)
{
if (serverFormats.Contains(format))
{
return format;
}
}
// We should never actually get here
return ImageFormat.Jpg;
}
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private void CopyFile(string src, string destination)
{
try
{
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_fileSystem.CopyFile(src, destination, true);
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}
catch
{
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}
}
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private string GetMimeType(ImageFormat format, string path)
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{
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if (format == ImageFormat.Bmp)
{
return MimeTypes.GetMimeType("i.bmp");
}
if (format == ImageFormat.Gif)
{
return MimeTypes.GetMimeType("i.gif");
}
if (format == ImageFormat.Jpg)
{
return MimeTypes.GetMimeType("i.jpg");
}
if (format == ImageFormat.Png)
{
return MimeTypes.GetMimeType("i.png");
}
if (format == ImageFormat.Webp)
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{
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return MimeTypes.GetMimeType("i.webp");
}
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return MimeTypes.GetMimeType(path);
}
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/// <summary>
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/// Increment this when there's a change requiring caches to be invalidated
/// </summary>
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private const string Version = "3";
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/// <summary>
/// Gets the cache file path based on a set of parameters
/// </summary>
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private string GetCacheFilePath(string originalPath, ImageSize outputSize, int quality, DateTime dateModified, ImageFormat format, bool addPlayedIndicator, double percentPlayed, int? unwatchedCount, int? blur, string backgroundColor, string foregroundLayer)
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{
var filename = originalPath;
filename += "width=" + outputSize.Width;
filename += "height=" + outputSize.Height;
filename += "quality=" + quality;
filename += "datemodified=" + dateModified.Ticks;
filename += "f=" + format;
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if (addPlayedIndicator)
{
filename += "pl=true";
}
if (percentPlayed > 0)
{
filename += "p=" + percentPlayed;
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}
if (unwatchedCount.HasValue)
{
filename += "p=" + unwatchedCount.Value;
}
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if (blur.HasValue)
{
filename += "blur=" + blur.Value;
}
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if (!string.IsNullOrEmpty(backgroundColor))
{
filename += "b=" + backgroundColor;
}
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if (!string.IsNullOrEmpty(foregroundLayer))
{
filename += "fl=" + foregroundLayer;
}
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filename += "v=" + Version;
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return GetCachePath(ResizedImageCachePath, filename, "." + format.ToString().ToLower());
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}
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public ImageSize GetImageSize(BaseItem item, ItemImageInfo info)
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{
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return GetImageSize(item, info, false, true);
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}
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public ImageSize GetImageSize(BaseItem item, ItemImageInfo info, bool allowSlowMethods, bool updateItem)
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{
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var width = info.Width;
var height = info.Height;
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if (height > 0 && width > 0)
{
return new ImageSize
{
Width = width,
Height = height
};
}
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var path = info.Path;
_logger.LogInformation("Getting image size for item {0} {1}", item.GetType().Name, path);
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var size = GetImageSize(path, allowSlowMethods);
info.Height = Convert.ToInt32(size.Height);
info.Width = Convert.ToInt32(size.Width);
if (updateItem)
{
_libraryManager().UpdateImages(item);
}
return size;
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}
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public ImageSize GetImageSize(string path)
{
return GetImageSize(path, true);
}
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/// <summary>
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/// Gets the size of the image.
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/// </summary>
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private ImageSize GetImageSize(string path, bool allowSlowMethod)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException("path");
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}
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try
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{
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return ImageHeader.GetDimensions(path, _logger, _fileSystem);
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}
catch
{
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if (!allowSlowMethod)
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{
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throw;
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}
}
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return _imageEncoder.GetImageSize(path);
}
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/// <summary>
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/// Gets the image cache tag.
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/// </summary>
/// <param name="item">The item.</param>
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/// <param name="image">The image.</param>
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/// <returns>Guid.</returns>
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/// <exception cref="System.ArgumentNullException">item</exception>
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public string GetImageCacheTag(BaseItem item, ItemImageInfo image)
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{
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var supportedEnhancers = GetSupportedEnhancers(item, image.Type);
return GetImageCacheTag(item, image, supportedEnhancers);
}
public string GetImageCacheTag(BaseItem item, ChapterInfo chapter)
{
try
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{
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return GetImageCacheTag(item, new ItemImageInfo
{
Path = chapter.ImagePath,
Type = ImageType.Chapter,
DateModified = chapter.ImageDateModified
});
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}
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catch
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{
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return null;
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}
}
/// <summary>
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/// Gets the image cache tag.
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/// </summary>
/// <param name="item">The item.</param>
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/// <param name="image">The image.</param>
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/// <param name="imageEnhancers">The image enhancers.</param>
/// <returns>Guid.</returns>
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/// <exception cref="System.ArgumentNullException">item</exception>
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public string GetImageCacheTag(BaseItem item, ItemImageInfo image, IImageEnhancer[] imageEnhancers)
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{
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var originalImagePath = image.Path;
var dateModified = image.DateModified;
var imageType = image.Type;
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// Optimization
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if (imageEnhancers.Length == 0)
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{
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return (originalImagePath + dateModified.Ticks).GetMD5().ToString("N");
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}
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// 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();
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cacheKeys.Add(originalImagePath + dateModified.Ticks);
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return string.Join("|", cacheKeys.ToArray()).GetMD5().ToString("N");
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}
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private async Task<ValueTuple<string, DateTime>> GetSupportedImage(string originalImagePath, DateTime dateModified)
{
var inputFormat = (Path.GetExtension(originalImagePath) ?? string.Empty)
.TrimStart('.')
.Replace("jpeg", "jpg", StringComparison.OrdinalIgnoreCase);
// These are just jpg files renamed as tbn
if (string.Equals(inputFormat, "tbn", StringComparison.OrdinalIgnoreCase))
{
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return new ValueTuple<string, DateTime>(originalImagePath, dateModified);
}
if (!_imageEncoder.SupportedInputFormats.Contains(inputFormat, StringComparer.OrdinalIgnoreCase))
{
try
{
var filename = (originalImagePath + dateModified.Ticks.ToString(UsCulture)).GetMD5().ToString("N");
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var cacheExtension = _mediaEncoder().SupportsEncoder("libwebp") ? ".webp" : ".png";
var outputPath = Path.Combine(_appPaths.ImageCachePath, "converted-images", filename + cacheExtension);
var file = _fileSystem.GetFileInfo(outputPath);
if (!file.Exists)
{
await _mediaEncoder().ConvertImage(originalImagePath, outputPath).ConfigureAwait(false);
dateModified = _fileSystem.GetLastWriteTimeUtc(outputPath);
}
else
{
dateModified = file.LastWriteTimeUtc;
}
originalImagePath = outputPath;
}
catch (Exception ex)
{
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_logger.LogError(ex, "Image conversion failed for {originalImagePath}", originalImagePath);
}
}
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return new ValueTuple<string, DateTime>(originalImagePath, dateModified);
}
/// <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>
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public async Task<string> GetEnhancedImage(BaseItem item, ImageType imageType, int imageIndex)
{
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var enhancers = GetSupportedEnhancers(item, imageType);
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var imageInfo = item.GetImageInfo(imageType, imageIndex);
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var inputImageSupportsTransparency = SupportsTransparency(imageInfo.Path);
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var result = await GetEnhancedImage(imageInfo, inputImageSupportsTransparency, item, imageIndex, enhancers, CancellationToken.None);
return result.Item1;
}
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private async Task<ValueTuple<string, DateTime, bool>> GetEnhancedImage(ItemImageInfo image,
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bool inputImageSupportsTransparency,
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BaseItem item,
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int imageIndex,
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IImageEnhancer[] enhancers,
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CancellationToken cancellationToken)
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{
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var originalImagePath = image.Path;
var dateModified = image.DateModified;
var imageType = image.Type;
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try
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{
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var cacheGuid = GetImageCacheTag(item, image, enhancers);
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// Enhance if we have enhancers
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var enhancedImageInfo = await GetEnhancedImageInternal(originalImagePath, item, imageType, imageIndex, enhancers, cacheGuid, cancellationToken).ConfigureAwait(false);
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var enhancedImagePath = enhancedImageInfo.Item1;
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// If the path changed update dateModified
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if (!string.Equals(enhancedImagePath, originalImagePath, StringComparison.OrdinalIgnoreCase))
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{
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var treatmentRequiresTransparency = enhancedImageInfo.Item2;
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return new ValueTuple<string, DateTime, bool>(enhancedImagePath, _fileSystem.GetLastWriteTimeUtc(enhancedImagePath), treatmentRequiresTransparency);
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}
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error enhancing image");
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}
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return new ValueTuple<string, DateTime, bool>(originalImagePath, dateModified, inputImageSupportsTransparency);
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}
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/// <summary>
/// Gets the enhanced image internal.
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/// </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>
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/// <param name="supportedEnhancers">The supported enhancers.</param>
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/// <param name="cacheGuid">The cache unique identifier.</param>
/// <returns>Task&lt;System.String&gt;.</returns>
/// <exception cref="ArgumentNullException">
/// originalImagePath
/// or
/// item
/// </exception>
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private async Task<ValueTuple<string, bool>> GetEnhancedImageInternal(string originalImagePath,
BaseItem item,
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ImageType imageType,
int imageIndex,
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IImageEnhancer[] supportedEnhancers,
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string cacheGuid,
CancellationToken cancellationToken)
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{
if (string.IsNullOrEmpty(originalImagePath))
{
throw new ArgumentNullException("originalImagePath");
}
if (item == null)
{
throw new ArgumentNullException("item");
}
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var treatmentRequiresTransparency = false;
foreach (var enhancer in supportedEnhancers)
{
if (!treatmentRequiresTransparency)
{
treatmentRequiresTransparency = enhancer.GetEnhancedImageInfo(item, originalImagePath, imageType, imageIndex).RequiresTransparency;
}
}
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// All enhanced images are saved as png to allow transparency
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var cacheExtension = _imageEncoder.SupportedOutputFormats.Contains(ImageFormat.Webp) ?
".webp" :
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(treatmentRequiresTransparency ? ".png" : ".jpg");
var enhancedImagePath = GetCachePath(EnhancedImageCachePath, cacheGuid + cacheExtension);
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var lockInfo = GetLock(enhancedImagePath);
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await lockInfo.Lock.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
{
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// Check again in case of contention
if (_fileSystem.FileExists(enhancedImagePath))
{
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return new ValueTuple<string, bool>(enhancedImagePath, treatmentRequiresTransparency);
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}
_fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(enhancedImagePath));
await ExecuteImageEnhancers(supportedEnhancers, originalImagePath, enhancedImagePath, item, imageType, imageIndex).ConfigureAwait(false);
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return new ValueTuple<string, bool>(enhancedImagePath, treatmentRequiresTransparency);
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}
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finally
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{
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ReleaseLock(enhancedImagePath, lockInfo);
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}
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}
/// <summary>
/// Executes the image enhancers.
/// </summary>
/// <param name="imageEnhancers">The image enhancers.</param>
/// <param name="inputPath">The input path.</param>
/// <param name="outputPath">The output path.</param>
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/// <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>
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private async Task ExecuteImageEnhancers(IEnumerable<IImageEnhancer> imageEnhancers, string inputPath, string outputPath, BaseItem item, ImageType imageType, int imageIndex)
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{
// Run the enhancers sequentially in order of priority
foreach (var enhancer in imageEnhancers)
{
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await enhancer.EnhanceImageAsync(item, inputPath, outputPath, imageType, imageIndex).ConfigureAwait(false);
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// Feed the output into the next enhancer as input
inputPath = outputPath;
}
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}
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/// <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);
}
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public void CreateImageCollage(ImageCollageOptions options)
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{
_logger.LogInformation("Creating image collage and saving to {0}", options.OutputPath);
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_imageEncoder.CreateImageCollage(options);
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_logger.LogInformation("Completed creation of image collage and saved to {0}", options.OutputPath);
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}
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public IImageEnhancer[] GetSupportedEnhancers(BaseItem item, ImageType imageType)
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{
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List<IImageEnhancer> list = null;
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foreach (var i in ImageEnhancers)
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{
try
{
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if (i.Supports(item, imageType))
{
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if (list == null)
{
list = new List<IImageEnhancer>();
}
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list.Add(i);
}
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error in image enhancer: {0}", i.GetType().Name);
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}
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}
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return list == null ? Array.Empty<IImageEnhancer>() : list.ToArray();
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}
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private Dictionary<string, LockInfo> _locks = new Dictionary<string, LockInfo>();
private class LockInfo
{
public SemaphoreSlim Lock = new SemaphoreSlim(1, 1);
public int Count = 1;
}
private LockInfo GetLock(string key)
{
lock (_locks)
{
LockInfo info;
if (_locks.TryGetValue(key, out info))
{
info.Count++;
}
else
{
info = new LockInfo();
_locks[key] = info;
}
return info;
}
}
private void ReleaseLock(string key, LockInfo info)
{
info.Lock.Release();
lock (_locks)
{
info.Count--;
if (info.Count <= 0)
{
_locks.Remove(key);
info.Lock.Dispose();
}
}
}
private bool _disposed;
public void Dispose()
{
_disposed = true;
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var disposable = _imageEncoder as IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
private void CheckDisposed()
{
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
}
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}
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}