public static BitPix FromString(string bitpixString)
{
if (string.IsNullOrEmpty(bitpixString))
{
throw new ArgumentNullException(nameof(bitpixString));
}
// no reason to go above 8 layers as it wouldnt really be suitable as a bitpix
// 8 layers means 1 byte per pixel. (full grayscale)
const int maximumSuitableLayers = 8;
var widthHeight = (int)Math.Sqrt(bitpixString.Length);
var layers = 1;
var lowestValueNum = (byte)'0';
var highestValueNum = (byte)0;
// 1. find highest value to determine the layer count
// if the highest value is 0, then 1 layer is used.
for (var i = 0; i < bitpixString.Length; i++)
{
var value = (byte)bitpixString[i];
if (value > highestValueNum)
{
highestValueNum = value;
}
}
var highestValue = highestValueNum - lowestValueNum;
for (var layer = 1; layer <= maximumSuitableLayers; layer++)
{
var lastCount = BitPixUtilities.NumberOfBitCombinations(layer - 1);
var thisCount = BitPixUtilities.NumberOfBitCombinations(layer);
if (highestValue >= lastCount && highestValue < thisCount)
{
layers = layer;
break;
}
}
// 2. loop through each char of the string and convert it to the number it is.
var pix = BitPix.CreateEmpty(widthHeight, layers);
for (var y = 0; y < widthHeight; y++)
{
for (var x = 0; x < widthHeight; x++)
{
var charValue = (byte)bitpixString[y * widthHeight + x];
var value = (byte)(charValue - lowestValueNum);
pix.SetColorIndexAt(x, y, value);
}
}
return(pix);
}
public static BitPix CreateEmpty(int width, int height, int colorLayers)
{
if (width * height % 2 != 0)
{
throw new ArgumentException("The `width * height` MUST be divisble by 2.");
}
var numOfColors = BitPixUtilities.NumberOfBitCombinations(colorLayers);
var layers = new byte[colorLayers][];
for (var i = 0; i < layers.GetLength(0); i++)
{
// layers[i] = new byte[((width * height) / 8) * colorLayers];
layers[i] = new byte[(width * height) / 8];
}
return(new BitPix(width, height, numOfColors, layers));
}
public static BitPix CreateEmpty(int colorLayers)
{
return(new BitPix(8, 8, BitPixUtilities.NumberOfBitCombinations(colorLayers), new long[colorLayers]));
}
public static BitPix FromLongs(long[] l)
{
return(new BitPix(8, 8, BitPixUtilities.NumberOfBitCombinations(l.Length), l.Length));
}