public void RleEncodeDecodeLongSequence()
{
byte[] bytes = new byte[] {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
255, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
};
byte[] encoded = Rle.Encode(bytes);
byte[] decoded = Rle.Decode(encoded);
Assert.Less(encoded.Length, bytes.Length);
Assert.AreEqual(bytes, decoded);
}
public CompressedImage Compress(Bitmap bmp)
{
if (bmp.PixelFormat != PixelFormat.Format24bppRgb)
{
throw new Exception($"{bmp.PixelFormat} pixel format is not supported, supported rgb24");
}
var pixelsMatrix = _pixelsExtractor.Extract(bmp);
var converterPixelsMatrix = MatrixRgbToYCbCrConveter.Convert(pixelsMatrix);
var residueYPiece = bmp.Height % (_thinIndex * _dctSize);
var residueXPiece = bmp.Width % (_thinIndex * _dctSize);
var countAddYPiece = residueYPiece == 0 ? 0 : _thinIndex * _dctSize - residueYPiece;
var countAddXPiece = residueXPiece == 0 ? 0 : _thinIndex * _dctSize - residueXPiece;
var extendedPixelsMatrix = _matrixExtender.Extend(converterPixelsMatrix, countAddYPiece, countAddXPiece);
var yCbCrchannels = _channelExtractor.Extract(extendedPixelsMatrix);
var thinnedCbChannel = _matrixThinner.Thin(yCbCrchannels.CbChannel, _thinIndex);
var thinnedCrChannel = _matrixThinner.Thin(yCbCrchannels.CrChannel, _thinIndex);
var dctYPieces = _dctCompressor.Compress(yCbCrchannels.YChannel, _dctSize, _compressionLevel, _lumiaMatrixProvider.GetMatrix());
var dctCbPieces = _dctCompressor.Compress(thinnedCbChannel, _dctSize, _compressionLevel, _colorMatrixProvider.GetMatrix());
var dctCrPieces = _dctCompressor.Compress(thinnedCrChannel, _dctSize, _compressionLevel, _colorMatrixProvider.GetMatrix());
var result = new List <byte>();
var countYBlocksPerColorBlock = _thinIndex * _thinIndex;
for (int i = 0, thinI = 0; i < dctYPieces.Length; thinI++)
{
for (var j = 0; j < countYBlocksPerColorBlock; j++)
{
result.AddRange(dctYPieces[i++]);
}
result.AddRange(dctCbPieces[thinI]);
result.AddRange(dctCrPieces[thinI]);
}
var rle = Rle <byte> .Encode(result).ToArray();
Dictionary <BitsWithLength, byte> decodeTable;
long bitsCount;
var huf = HuffmanCodec.Encode(rle, out decodeTable, out bitsCount);
var compressedImage = new CompressedImage
{
ThinIndex = _thinIndex,
CompressionLevel = _compressionLevel,
DataBytes = huf,
Height = extendedPixelsMatrix.GetLength(0),
Width = extendedPixelsMatrix.GetLength(1),
DecodeTable = decodeTable,
BitsCount = bitsCount
};
return(compressedImage);
}
public void RleEncodeDecode()
{
byte[] bytes = new byte[] {
0, 0, 0, 0, 0, 0, 4, 2, 0, 4, 4, 4, 4, 4, 4, 4,
80, 80, 80, 80, 0, 2, 2, 2, 2, 255, 255, 255, 255, 255, 0, 0
};
byte[] encoded = Rle.Encode(bytes);
byte[] decoded = Rle.Decode(encoded);
Assert.Less(encoded.Length, bytes.Length);
Assert.AreEqual(bytes, decoded);
}
