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using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.RemoteDesktop.Encoders
{
/// <summary>
/// Represents an <see cref="IFrame"/> JPEG encoder.
/// </summary>
/// <seealso cref="Tango.RemoteDesktop.FrameEncoder" />
public class JpegEncoder : FrameEncoder
{
/// <summary>
/// Initializes a new instance of the <see cref="JpegEncoder"/> class.
/// </summary>
/// <param name="frame">The frame.</param>
public JpegEncoder(IFrame frame) : base(frame)
{
}
/// <summary>
/// Returns a stream containing the encoded frame.
/// </summary>
/// <returns></returns>
public override MemoryStream ToStream()
{
return ToStream(100);
}
/// <summary>
/// Returns a stream containing the encoded frame with the specified quality.
/// </summary>
/// <param name="quality">The quality.</param>
/// <returns></returns>
public virtual MemoryStream ToStream(long quality)
{
var encoderParameters = new EncoderParameters(1);
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
MemoryStream ms = new MemoryStream();
Frame.ToBitmap().Save(ms, GetEncoder(ImageFormat.Jpeg), encoderParameters);
ms.Position = 0;
return ms;
}
/// <summary>
/// Returns a byte array containing the encoded frame with the specified quality.
/// </summary>
/// <param name="quality">The quality.</param>
/// <returns></returns>
public byte[] ToArray(long quality)
{
using (MemoryStream ms = ToStream(quality))
{
return ms.ToArray();
}
}
private ImageCodecInfo GetEncoder(ImageFormat format)
{
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
return codecs.Single(codec => codec.FormatID == format.Guid);
}
}
}
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