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 Test()
{
var bmp1 = (Bitmap)Image.FromFile(@"C:\Users\FessEmpty\Downloads\parallelprogramming-shpora2016-56f562c98bbf\parallelprogramming-shpora2016-56f562c98bbf\JPEG\sample.bmp");
var bitmapData1 = bmp1.LockBits(new Rectangle(0, 0, bmp1.Width, bmp1.Height), ImageLockMode.ReadOnly, bmp1.PixelFormat);
const int rgpPixelSize = 3;
var additional = bitmapData1.Stride - bitmapData1.Width * rgpPixelSize;
var result = new RgbPixel[bmp1.Height, bmp1.Width];
unsafe
{
var imagePointer = (byte *)bitmapData1.Scan0;
for (var j = 0; j < bitmapData1.Height; j++, imagePointer += additional)
{
for (var i = 0; i < bitmapData1.Width; i++, imagePointer += rgpPixelSize)
{
result[j, i] = new RgbPixel(imagePointer[0], imagePointer[1], imagePointer[2]);
}
}
}
bmp1.UnlockBits(bitmapData1);
var convert = MatrixRgbToYCbCrConveter.Convert(result);
var back = MatrixYCbCrToRgbConverter.Convert(convert);
var bmp2 = new Bitmap(bmp1.Width, bmp1.Height, bmp1.PixelFormat);
var bitmapData2 = bmp2.LockBits(new Rectangle(0, 0, bmp2.Width, bmp2.Height), ImageLockMode.ReadOnly, bmp2.PixelFormat);
unsafe
{
var imagePointer = (byte *)bitmapData2.Scan0;
for (var j = 0; j < bitmapData2.Height; j++, imagePointer += additional)
{
for (var i = 0; i < bitmapData2.Width; i++, imagePointer += rgpPixelSize)
{
imagePointer[0] = back[j, i].R;
imagePointer[1] = back[j, i].G;
imagePointer[2] = back[j, i].B;
}
}
}
bmp2.UnlockBits(bitmapData2);
bmp2.Save(@"C:\Users\FessEmpty\Downloads\parallelprogramming-shpora2016-56f562c98bbf\parallelprogramming-shpora2016-56f562c98bbf\JPEG\sampleTest.bmp", ImageFormat.Bmp);
}