//Decompress byte array into aBitmap with help of width, length and bitdepth
public static AccessibleBitmapBytewise Decompress(byte[] inBytes, AccessibleBitmapBytewise inBitmap, out byte[] restBytes, int byteLayer)
{
//Create a AccessibleBitmapbitwise class from the incoming AccessibleBitmapbytewise class, for better access to individual bits
AccessibleBitmapBitwise outputBitmap = new AccessibleBitmapBitwise(inBitmap);
//Create a BitStreamFIFO class from the incoming bytes, to feed into the decompression algorithms
BitStreamFIFO bitStream = new BitStreamFIFO(inBytes);
//Loop trough all bit layers of current byte layer
for (int i = byteLayer * 8; i < byteLayer * 8 + 8; i++)
{
//Read compression type as a 3-bit integer
int compressionType = bitStream.ReadInt(3);
//Decompress using the correct compression type
switch (compressionType)
{
//Uncompressed
case 0:
outputBitmap = UncompressedBitmapCompressorBitwise.Decompress(bitStream, outputBitmap, out bitStream, i);
break;
//Bit channel compressed as 8-bit integers
case 1:
outputBitmap = ByteArrayCompressorBitwise.Decompress(bitStream, outputBitmap, out bitStream, i);
break;
//Run length encoding
case 2:
outputBitmap = RunLengthEncodingCompressorBitwise.Decompress(bitStream, outputBitmap, out bitStream, i);
break;
//Run length encoding vertical
case 3:
outputBitmap = RunLengthEncodingCompressorVerticalBitwise.Decompress(bitStream, outputBitmap, out bitStream, i);
break;
//To add a decompression type add a new case like the existing ones
//Unknown compression type: error
default:
throw new Exception("Unexisting compression type");
}
}
//Remove the bytes used for this channel from the incoming byte array and pass the rest of them to the next channel
restBytes = new byte[bitStream.Length / 8];
Array.Copy(inBytes, inBytes.Length - (bitStream.Length / 8), restBytes, 0, restBytes.Length);
//Return the modified bitmap as AccessibleBitmapbytewise so the rest of the channels can be added to complete it
return(new AccessibleBitmapBytewise(outputBitmap.GetAccessibleBitmap()));
}
