//Decompress byte array into aBitmap with help of width, length and bitdepth
public static AccessibleBitmap Decompress(byte[] source, int width, int height, int pixelBytes)
{
//Create a empty AccessibleBitmapBytewise class with the correct dimensions and color channels
AccessibleBitmapBytewise outputBitmap = new AccessibleBitmapBytewise(new AccessibleBitmap(width, height, pixelBytes));
//Initialize
byte[] inBytes; //Stores the bytes to feed to the decompressor
byte[] outBytes = source; //Stores the bytes which are left by the previous decompressed channel: starts with all the input data
//Loop trough all color channels
for (int i = 0; i < pixelBytes; i++)
{
//Read compression type from outBytes & copy the rest of them to inBytes so they can be used for the next channel
int compressionType = outBytes[0];
inBytes = new byte[outBytes.Length - 1];
Array.Copy(outBytes, 1, inBytes, 0, inBytes.Length);
//Decompress using the correct compression type
switch (compressionType)
{
//Uncompressed
case 0:
outputBitmap = UncompressedBitmapCompressorBytewise.Decompress(inBytes, outputBitmap, out outBytes, i);
break;
//Individual compressed bit channels added together
case 1:
outputBitmap = BitLayerVaryingCompressor.Decompress(inBytes, outputBitmap, out outBytes, i);
break;
//Color channel compressed as integers
case 2:
outputBitmap = ByteArrayCompressorBytewise.Decompress(inBytes, outputBitmap, out outBytes, i);
break;
//Run length compression
case 3:
outputBitmap = RunLengthEncodingCompressorBytewise.Decompress(inBytes, outputBitmap, out outBytes, i);
break;
//Run length encoding vertical
case 4:
outputBitmap = RunLengthEncodingCompressorVerticalBytewise.Decompress(inBytes, outputBitmap, out outBytes, 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");
}
}
return(outputBitmap.GetAccessibleBitmap());
}
