/// <summary>
/// Associate the JPEG image of length <code>imageSize</code> bytes stored in <code>jpegImage</code> with this
/// decompressor instance. This image will be used as the source image for subsequent decompress operations.
/// </summary>
/// <param name="jpegImage"> JPEG image buffer</param>
public void SetJpegImage(byte[] jpegImage)
{
Contract.Requires(jpegImage != null);
this.jpegBuffer = jpegImage;
int width;
int height;
Subsampling chroma;
Colourspace colourspace;
if (NativeMethods.decompressHeader(this.Handle,
this.jpegBuffer,
this.jpegBuffer.Length,
out width,
out height,
out chroma,
out colourspace) != 0)
{
throw new Exception(Marshal.PtrToStringAnsi(NativeMethods.getErrorMessage()));
}
this.jpegWidth = width;
this.jpegHeight = height;
this.jpegSubsampling = chroma;
this.JpegColourspace = colourspace;
}
internal static extern int decompressHeader(IntPtr handle,
[In][MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.U1)]
byte[] sourceBuffer,
int size,
out int width,
out int height,
[MarshalAs(UnmanagedType.I4)] out Subsampling chroma,
[MarshalAs(UnmanagedType.I4)] out Colourspace colourspace);
/// <summary>
/// Associate the JPEG image of length <code>imageSize</code> bytes stored in <code>jpegImage</code> with this
/// decompressor instance. This image will be used as the source image for subsequent decompress operations.
/// </summary>
/// <param name="jpegImage"> JPEG image buffer</param>
public void SetJpegImage(byte[] jpegImage)
{
Contract.Requires(jpegImage != null);
this.jpegBuffer = jpegImage;
int width;
int height;
Subsampling chroma;
Colourspace colourspace;
if (NativeMethods.decompressHeader(this.Handle,
this.jpegBuffer,
this.jpegBuffer.Length,
out width,
out height,
out chroma,
out colourspace) != 0)
{
throw new Exception(Marshal.PtrToStringAnsi(NativeMethods.getErrorMessage()));
}
this.jpegWidth = width;
this.jpegHeight = height;
this.jpegSubsampling = chroma;
this.JpegColourspace = colourspace;
}
