public async Task <bool> Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
await _fileService.ReadFileStream(fileInfo.FileHandle, videoStream =>
{
using var formatContext = new FormatContext(videoStream);
var attachedPicStream = formatContext.FindAttachedPicStream();
if (attachedPicStream != null)
{
DrawAttachedPicture(ctx, attachedPicStream);
}
else
{
var audioStream = formatContext.FindBestAudioStream();
if (audioStream == null)
{
throw new InvalidDataException("No audio stream found");
}
DrawWaves(ctx, audioStream);
}
return(ValueTask.FromResult(true));
});
return(true);
}
protected override Task <bool> Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
Assert.AreEqual(MimeType.image_png, fileInfo.MimeType);
return(Task.FromResult(true));
}
public virtual bool IsSupported(ThumbnailsRenderFileInfo fileInfo)
{
if (fileInfo.Type.HasFlag(FileType.File) && fileInfo.MimeType != null &&
fileInfo.MimeType.Mime.StartsWith("audio/", StringComparison.Ordinal))
{
return(true);
}
return(false);
}
public async Task <bool> Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
await _fileService.ReadFileStream(
fileInfo.FileHandle,
videoStream => ValueTask.FromResult(DrawVideo(videoStream, ctx)));
return(true);
}
async Task <bool> IThumbnailsRenderer.Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
if (!IsSupported(fileInfo))
{
return(false);
}
return(await Render(ctx, fileInfo, option));
}
/// <inheritdoc />
protected override async Task <bool> Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
// use the following code maybe faster. https://github.com/kleisauke/net-vips/issues/128
// > sourceVipsImage = Image.Thumbnail(localPath, loadImageSize, loadImageSize, noRotate: false);
return(await _fileService.ReadFileStream(
fileInfo.FileHandle,
stream =>
{
var sourceVipsImage = Image.ThumbnailStream(
stream,
(int)(ThumbnailUtils.DefaultMaxWidth * ctx.Density),
height: (int)(ThumbnailUtils.DefaultMaxHeight * ctx.Density),
noRotate: false);
sourceVipsImage = sourceVipsImage.Colourspace(Enums.Interpretation.Srgb).Cast(Enums.BandFormat.Uchar);
if (!sourceVipsImage.HasAlpha())
{
sourceVipsImage = sourceVipsImage.Bandjoin(255);
}
var imageWidth = sourceVipsImage.Width;
var imageHeight = sourceVipsImage.Height;
var sourceImageDataPtr = sourceVipsImage.WriteToMemory(out _);
sourceVipsImage.Close();
try
{
using var colorspace = SKColorSpace.CreateSrgb();
var sourceImageInfo = new SKImageInfo(
imageWidth,
imageHeight,
SKColorType.Rgba8888,
SKAlphaType.Unpremul,
colorspace);
using var image =
SKImage.FromPixels(sourceImageInfo, sourceImageDataPtr, sourceImageInfo.RowBytes);
ThumbnailUtils.DrawShadowView(ctx, new SkImageView(image));
}
finally
{
NetVips.NetVips.Free(sourceImageDataPtr);
}
return ValueTask.FromResult(true);
}));
}
public virtual bool IsSupported(ThumbnailsRenderFileInfo fileInfo)
{
if (_cacheSupportMimeTypes == null)
{
_cacheSupportMimeTypes = SupportMimeTypes;
}
var fileMimeType = fileInfo.MimeType;
if (fileInfo.Type.HasFlag(FileType.File) &&
fileMimeType != null &&
_cacheSupportMimeTypes.Value.Contains(fileMimeType) &&
fileInfo.Size <= MaxFileSize)
{
return(true);
}
return(false);
}
public bool IsSupported(ThumbnailsRenderFileInfo fileInfo)
{
return(_wrappedThumbnailsRenderer.IsSupported(fileInfo));
}
public Task <bool> Render(ThumbnailsRenderContext ctx, ThumbnailsRenderFileInfo fileInfo, ThumbnailsRenderOption option)
{
RenderCount++;
return(_wrappedThumbnailsRenderer.Render(ctx, fileInfo, option));
}
protected abstract Task <bool> Render(ThumbnailsRenderContext ctx, ThumbnailsRenderFileInfo fileInfo, ThumbnailsRenderOption option);