public bool TryGetImage
(string path, ImageQuality quality, out ImageSourceContainer image)
{
if (this.TryGetImageData(path, quality, out var result))
{
if (result != null)
{
count++;
image = result.GetImage(count);
return(true);
}
}
image = null;
return(false);
}
public ImageBufferItem(ImageSourceContainer source, ulong initialCount)
{
this.image = source;
this.LastLoadedCount = initialCount;
}
/// <summary>
/// 画像読み込みメイン処理
/// 同じスケジューラの上でシーケンシャルに動作
/// </summary>
/// <param name="command"></param>
/// <returns></returns>
private async Task LoadImageAsync(CommandPacket command)
{
var key = command.Path;
if (this.TryGetImage(key, command.Option.Quality, out var result))
{
if (result != null)
{
command.Observer.OnNext(result);
command.Observer.OnCompleted();
return;
}
}
var token = command.CancellationToken;
if (token.IsCancellationRequested)
{
command.Observer.OnCompleted();
return;
}
var image = new ImageSourceContainer();
bool failedFlag = false;
var option = command.Option;
var file = command.File;
Size?frameSize = null;
switch (option.Quality)
{
case ImageQuality.ThumbNail:
case ImageQuality.Resized:
//リサイズ
if (option.FrameWidth > 1 && option.FrameHeight > 1)
{
frameSize = new Size(option.FrameWidth, option.FrameHeight);
}
else if (option.Quality == ImageQuality.ThumbNail)
{
frameSize = this.lowQualitySize;
}
break;
case ImageQuality.LowQuality:
//低画質読み込み
frameSize = this.lowQualitySize;
break;
case ImageQuality.OriginalSize:
//オリジナルサイズで読み込み
frameSize = null;
break;
default:
break;
}
var asThumbnail = option.Quality <= ImageQuality.LowQuality;
try
{
if (file != null)
{
await image.LoadImageAsync
(file, frameSize, asThumbnail, option.IsFill, option.CmsEnable);
}
else
{
await image.LoadImageAsync
(key, frameSize, asThumbnail, option.IsFill, option.CmsEnable);
}
}
catch (OutOfMemoryException e)
{
if (option.Quality == ImageQuality.ThumbNail)
{
ClearBuffer();
command.Observer.OnError(e);
return;
}
else
{
failedFlag = true;
}
}
catch (Exception e)
{
command.Observer.OnError(e);
return;
}
if (failedFlag)
{
if (token.IsCancellationRequested)
{
command.Observer.OnCompleted();
return;
}
this.ClearBuffer();
GC.Collect();
GC.WaitForPendingFinalizers();
await Task.Delay(300);
image = new ImageSourceContainer();
if (!frameSize.HasValue ||
frameSize.Value.Width > failedLoadingLength ||
frameSize.Value.Height > failedLoadingLength)
{
//サイズ小さめ
frameSize = failedLoadingSize;
}
var reloadOption = command.Option.Clone();
try
{
if (file != null)
{
await image.LoadImageAsync
(file, frameSize, asThumbnail, option.IsFill, option.CmsEnable);
}
else
{
await image.LoadImageAsync
(key, frameSize, asThumbnail, option.IsFill, option.CmsEnable);
}
}
catch (Exception e)
{
command.Observer.OnError(e);
return;
}
}
if (image.HasImage())
{
if (option.Quality == ImageQuality.ThumbNail || image.Quality <= ImageQuality.LowQuality)
{
thumbNailImages.AddOrExtrude
(key, new ImageBufferItem(image, ++this.count), thumbNailbufferSize);
}
else
{
images.AddOrExtrude
(key, new ImageBufferItem(image, ++this.count), bufferSize);
}
this.UpdatedSubject.OnNext(key);
command.Observer.OnNext(image);
}
command.Observer.OnCompleted();
}
