/// <summary>
/// Returns true when the supplied stream is supported.
/// </summary>
/// <param name="stream">The stream to check.</param>
/// <returns>True when the supplied stream is supported.</returns>
public bool IsSupported(Stream stream)
{
Throw.IfNull(nameof(stream), stream);
if (!stream.CanRead || !stream.CanWrite || !stream.CanSeek)
{
return(false);
}
long startPosition = stream.Position;
IMagickImageInfo info = new MagickImageInfo(stream);
stream.Position = startPosition;
return(IsSupported(MagickFormatInfo.Create(info.Format)));
}
/// <summary>
/// Read basic information about an image with multiple frames/pages.
/// </summary>
/// <param name="data">The span of bytes to read the information from.</param>
/// <returns>A <see cref="IMagickImageInfo"/> iteration.</returns>
/// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
public static IReadOnlyCollection <IMagickImageInfo> ReadCollection(ReadOnlySpan <byte> data)
{
var result = new List <MagickImageInfo>();
using (var images = new MagickImageCollection())
{
images.Ping(data);
foreach (var image in images)
{
var info = new MagickImageInfo();
info.Initialize(image);
result.Add(info);
}
}
return(result);
}
private IImageOptimizer GetOptimizer(Stream stream)
{
long position = stream.Position;
MagickImageInfo imageInfo = new MagickImageInfo(stream);
stream.Position = position;
MagickFormatInfo info = MagickNET.GetFormatInformation(imageInfo.Format);
foreach (IImageOptimizer optimizer in _optimizers)
{
if (optimizer.Format.Module == info.Module)
{
return(optimizer);
}
}
throw new MagickCorruptImageErrorException("Invalid format, supported formats are: " + SupportedFormats);
}
public static MagickFormatInfo GetFormatInformation(Stream stream)
{
var startPosition = stream.Position;
try
{
var info = new MagickImageInfo(stream);
return(MagickNET.GetFormatInformation(info.Format));
}
catch
{
stream.Position = startPosition;
return(GetFormatInformationFromHeader(stream));
}
finally
{
stream.Position = startPosition;
}
}
