/// <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;
}
public static void Encode(string inPath, string outPath, int q, Subsampling subsampling, bool printSubsampling = true)
{
try
{
Bitmap bmp = (Bitmap)IOUtils.GetImage(inPath);
var compressor = new TJCompressor();
byte[] compressed;
TJSubsamplingOption subSample = TJSubsamplingOption.Chrominance420;
if (subsampling == Subsampling.Chroma422)
{
subSample = TJSubsamplingOption.Chrominance422;
}
if (subsampling == Subsampling.Chroma444)
{
subSample = TJSubsamplingOption.Chrominance444;
}
if (printSubsampling)
{
Program.Print("-> Chroma Subsampling: " + subSample.ToString().Replace("Chrominance", ""));
}
compressed = compressor.Compress(bmp, subSample, q, TJFlags.None);
File.WriteAllBytes(outPath, compressed);
//Program.Print("[MozJpeg] Written image to " + outPath);
}
catch (Exception e)
{
Program.Print("MozJpeg Error: " + e.Message);
}
}
/// <summary>Returns the MCU block height for the specified chroma subsampling.</summary>
/// <param name="subsampling">The chroma subsampling.</param>
/// <returns>The MCU block height.</returns>
public static int GetMcuHeight(this Subsampling subsampling)
{
Contract.Requires(Enum.IsDefined(typeof(Subsampling), subsampling));
Contract.Assume((int)subsampling < LibJpegTurbo.Net.TurboJpegUtilities.mcuHeight.Length);
return(TurboJpegUtilities.mcuHeight[(int)subsampling]);
}
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);
internal static extern int encodeYUV(IntPtr handle,
byte[] sourceBuffer,
int width,
int pitch,
int height,
[MarshalAs(UnmanagedType.I4)] PixelFormat pixelFormat,
byte[] destinationBuffer,
[MarshalAs(UnmanagedType.I4)] Subsampling subsamp,
[MarshalAs(UnmanagedType.I4)] TurboJpegFlags flags);
internal static extern int compress(IntPtr handle,
byte[] sourceBuffer,
int width,
int pitch,
int height,
[MarshalAs(UnmanagedType.I4)] PixelFormat pixelFormat,
ref IntPtr destinationBuffer,
ref ulong bufferSize,
[MarshalAs(UnmanagedType.I4)] Subsampling jpegSubsamp,
int jpegQual,
[MarshalAs(UnmanagedType.I4)] TurboJpegFlags flags);
internal static extern int bufSizeYUV(int width,
int pad,
int height,
[MarshalAs(UnmanagedType.I4)] Subsampling subsamp);
internal static extern int bufSize(int width, int height, [MarshalAs(UnmanagedType.I4)] Subsampling jpegSubsamp);
/// <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;
}
