//Compress aBitmap into byte array
public static byte[] Compress(AccessibleBitmapBytewise source, int byteLayer)
{
//Initialize
List <int> distances = new List <int>(); //A list containing all the lenghts of same pixels
List <int> pixels = new List <int>(); //A list containing all the pixels that correspond to the lengths in 'distances' list
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
byte lastPixel = source.GetPixelByte(0, 0, byteLayer); //The pixel 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
byte currentPixel = source.GetPixelByte(x, y, byteLayer);
//If the value of the bit of this pixel matches the value of the bit of the previous pixel
if (currentPixel == lastPixel)
{
//Values are the same, so increase current run
tempDistance++;
}
else
{
//Values are not the same, so save the run
distances.Add(tempDistance);
pixels.Add(lastPixel);
//Set the bit value for the next comparison to the bit value of this pixel
lastPixel = currentPixel;
//Reset the run length for the new run
tempDistance = 0;
}
}
}
//Save the last run becouse this never happens in the loop
distances.Add(tempDistance);
pixels.Add(lastPixel);
//Compress the array of run lengths using different techniques
BitStreamFIFO pixelStream = VaryingIntArrayCompressor.Compress(pixels.ToArray());
//Compress the array of run lengths using different techniques
BitStreamFIFO lengthStream = VaryingIntArrayCompressor.Compress(distances.ToArray());
//Combine the compressed data of the runs with the compressed data of the pixel values, then return the BitStream
return(BitStreamFIFO.Merge(pixelStream, lengthStream).ToByteArray());
}
//Compress aBitmap into byte array
public static byte[] Compress(AccessibleBitmapBytewise source, int byteLayer)
{
//Create byte array with a size equal to the amount of pixels in the image
byte[] output = new byte[source.width * source.height];
//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 byte of this channel from the current pixel to the correct position in the output array
output[y * source.width + x] = source.GetPixelByte(x, y, byteLayer);
}
}
//Return all bytes of this channel
return(output);
}
//Compress aBitmap into byte array
public static byte[] Compress(AccessibleBitmapBytewise source, int byteLayer)
{
//Create int array with a size equal to the amount of pixels in the image
int[] layerByteArray = new int[source.width * source.height];
//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 byte of this channel from the current pixel to the correct position in the output array
layerByteArray[y * source.width + x] = source.GetPixelByte(x, y, byteLayer);
}
}
//Compress the obtained array of integers using different techniques
byte[] outputArray = VaryingIntArrayCompressor.Compress(layerByteArray).ToByteArray();
//Return the output array
return(outputArray);
}