/// <summary>
/// Forward application of the algorithm
/// </summary>
/// <param name="parOriginalImage">Original image stream</param>
/// <param name="parArguments">List of an arguments (long qualityLevel, ImageFormat interimFormat)</param>
/// <returns>Compressed image stream</returns>
public override Stream CompressImage(Stream parOriginalImage, List <object> parArguments)
{
Bitmap original = new Bitmap(parOriginalImage);
int originalWidth = original.Width;
int originalHeight = original.Height;
int moddedWidth = (originalWidth + 1) / 2;
int moddedHeight = originalHeight;
byte lastColumnIsOdd = (byte)(originalWidth % 2);
Bitmap modded = new Bitmap(moddedWidth, moddedHeight, original.PixelFormat);
BitmapData bdOriginal = original.LockBits(new Rectangle(0, 0, originalWidth, originalHeight),
ImageLockMode.ReadOnly,
PixelFormat.Format32bppArgb);
int[] bitsOriginal = new int[originalWidth * originalHeight];
Marshal.Copy(bdOriginal.Scan0, bitsOriginal, 0, bitsOriginal.Length);
// --/--
BitmapData bdModded = modded.LockBits(new Rectangle(0, 0, moddedWidth, moddedHeight),
ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
int[] bitsModded = new int[moddedWidth * moddedHeight];
Marshal.Copy(bdModded.Scan0, bitsModded, 0, bitsModded.Length);
for (int i = 0; i < moddedHeight; i += 2)
{
for (int j = 0; j < moddedWidth; j++)
{
bitsModded[i * moddedWidth + j] = bitsOriginal[i * moddedWidth * 2 + j * 2];
if ((j * 2 + 1) < originalWidth)
{
bitsModded[(i + 1) * moddedWidth + j] = bitsOriginal[(i + 1) * moddedWidth * 2 + j * 2 + 1];
}
}
}
Marshal.Copy(bitsModded, 0, bdModded.Scan0, bitsModded.Length);
original.UnlockBits(bdOriginal);
modded.UnlockBits(bdModded);
Stream interlacedImage = new MemoryStream();
ImageFormat format = (ImageFormat)parArguments[1];
modded.Save(interlacedImage, format);
interlacedImage.WriteByte(lastColumnIsOdd);
GZIP gzip = GZIP.GetInstance();
int compressionLevel = (int)parArguments[0];
Stream compressedImage = gzip.CompressImage(interlacedImage, new List <object>()
{
compressionLevel
});
return(compressedImage);
}
/// <summary>
/// Forward application of the algorithm
/// </summary>
/// <param name="parOriginalImage">Original image stream</param>
/// <param name="parArguments">List of an arguments (long qualityLevel, ImageFormat interimFormat)</param>
/// <returns>Compressed image stream</returns>
public override Stream CompressImage(Stream parOriginalImage, List <object> parArguments)
{
Bitmap original = new Bitmap(parOriginalImage);
int levels = (int)parArguments[0];
HaarWavelet.ApplyTransform(ref original, true, levels);
Stream waveletStream = new MemoryStream();
ImageFormat format = (ImageFormat)parArguments[2];
original.Save(waveletStream, format);
GZIP gzip = GZIP.GetInstance();
int compressionLevel = (int)parArguments[1];
Stream compressedImage = gzip.CompressImage(waveletStream, new List <object>()
{
compressionLevel
});
return(compressedImage);
}
