//Compress aBitmap into byte array
public static BitStreamFIFO Compress(AccessibleBitmapBitwise source, int bitLayer)
{
//Initialize
List <int> distances = new List <int>(); //A list containing all the lenghts of same bits
int tempDistance = -1; //The length of one run of bits with the same value, while it is not saved yet: -1 becouse it will be increased before the first check
bool lastVal = source.GetPixelBit(0, 0, bitLayer); //The bit value of the last checked pixel, to compare with the current pixel: set value to the value of the first pixel so the first check will succeed
//Loop trough all lines of pixels
for (int y = 0; y < source.height; y++)
{
//Loop trough all pixels in this line
for (int x = 0; x < source.width; x++)
{
//Take value of the current pixel
bool currentBool = source.GetPixelBit(x, y, bitLayer);
//If the value of the bit of this pixel matches the value of the bit of the previous pixel
if (currentBool == lastVal)
{
//Values are the same, so increase current run
tempDistance++;
}
else
{
//Values are not the same, so save the run
distances.Add(tempDistance);
//Set the bit value for the next comparison to the bit value of this pixel
lastVal = currentBool;
//Reset the run length for the new run
tempDistance = 0;
}
}
}
//Save the last run becouse this never happens in the loop
distances.Add(tempDistance);
//Save the bit value of the first pixel, because the decompressor needs to know this
bool initialVal = source.GetPixelBit(0, 0, bitLayer);
//Compress the array of run lengths using different techniques
BitStreamFIFO bitStream = VaryingIntArrayCompressor.Compress(distances.ToArray());
//Combine the inititial bit value with the compressed data of the runs, then return the BitStream
return(BitStreamFIFO.Merge(new BitStreamFIFO(new bool[] { initialVal }), bitStream));
}
//Compress aBitmap into byte array
public static BitStreamFIFO Compress(AccessibleBitmapBitwise source, int bitLayer)
{
//Initialize vars
BitStreamFIFO bitStream = new BitStreamFIFO();
List <int> distances = new List <int>();
int tempDistance = -1;
bool lastVal = source.GetPixelBit(0, 0, bitLayer);
//Iterate trough pixels
for (int y = 0; y < source.height; y++)
{
for (int x = 0; x < source.width; x++)
{
//Take value of pixel & compare with previous value
bool currentBool = source.GetPixelBit(x, y, bitLayer);
if (currentBool == lastVal)
{
//Values are the same, so increase current run
tempDistance++;
}
else
{
//Values are not the same, so save the run and create a new one
distances.Add(tempDistance);
lastVal = currentBool;
tempDistance = 0;
}
}
}
//Save the last run becouse this never happens in the loop
distances.Add(tempDistance);
bool initialVal = source.GetPixelBit(0, 0, bitLayer);
bitStream.Write(initialVal);
BitStreamFIFO output = BitStreamFIFO.Merge(bitStream, VaryingIntArrayCompressor.Compress(distances.ToArray()));
return(output);
}
//Compress aBitmap into byte array
public static BitStreamFIFO Compress(AccessibleBitmapBitwise source, int bitLayer)
{
//Initialize
List <int> ints = new List <int>(); //List of all integers generated from the bits of this channel
bool[] tmpBools = new bool[8]; //The collection of bits that will be converted to an interger
int index = 0; //The index in tmpBools where a new bit should be inserted
//Loop trough all lines of pixels
for (int y = 0; y < source.height; y++)
{
//Loop trough all pixels in this line
for (int x = 0; x < source.width; x++)
{
//Write bit of current pixel to the correct position in tmpBools
tmpBools[index] = source.GetPixelBit(x, y, bitLayer);
//Increase index for next bit
index++;
//If index is 8, tmpBools is full
if (index == 8)
{
//Set index to 0, so the next bit will be written to the start
index = 0;
//Convert tmpBools to an integer & add the result to the list of integers
ints.Add(new BitStreamFIFO().BoolArrayToInt(tmpBools));
}
}
}
//If index is not 0, it has not been reset at last, so tmpBools should be saved for the last bits it contains
if (index > 0)
{
//Convert tmpBools to an integer & add the result to the list of integers
ints.Add(new BitStreamFIFO().BoolArrayToInt(tmpBools));
}
//Compress the obtained array of integers using different techniques
BitStreamFIFO bitStream = VaryingIntArrayCompressor.Compress(ints.ToArray());
//Return the output array
return(bitStream);
}
//Compress aBitmap into byte array
public static BitStreamFIFO Compress(AccessibleBitmapBitwise source, int bitLayer)
{
//Creates a new BitStreamFIFO object where all bits will be written to
BitStreamFIFO bitStream = new BitStreamFIFO();
//Loop trough all lines of pixels
for (int y = 0; y < source.height; y++)
{
//Loop trough all pixels in this line
for (int x = 0; x < source.width; x++)
{
//Write the bit of this channel from the current pixel to the output BitStream
bitStream.Write(source.GetPixelBit(x, y, bitLayer));
}
}
//Return the BitStream
return(bitStream);
}
