private void setSecondPixel(Color pixelColor, byte[] imageWithHeader)
{
if (this.EncryptionType == EncryptionType.Encrypted)
{
pixelColor.R |= 1;
}
else
{
pixelColor.R &= 0xfe;
}
if (this.FileType == FileType.Text)
{
pixelColor.B |= 1;
}
else
{
pixelColor.B &= 0xfe;
}
pixelColor.G = (byte)this.Bpcc;
PixelUtilities.SetPixelBgra8(imageWithHeader, ImageConstants.FirstX, ImageConstants.SecondX,
pixelColor, this.sourcePicture.Width,
this.sourcePicture.Height);
}
private void setPixelWhite(int j, int i)
{
var sourcePixelColor =
Color.FromArgb(this.maxRgbValue, this.maxRgbValue, this.maxRgbValue, this.maxRgbValue);
PixelUtilities.SetPixelBgra8(this.sourcePicture.Pixels, j, i, sourcePixelColor,
this.sourcePicture.Width, this.sourcePicture.Height);
}
private void setPixelBlack(byte[] pixels, int i, int j)
{
var sourcePixelColor =
Color.FromArgb(this.maxRgbValue, this.minRgbValue, this.minRgbValue, this.minRgbValue);
PixelUtilities.SetPixelBgra8(pixels, i, j, sourcePixelColor,
this.sourcePicture.Width,
this.sourcePicture.Height);
}
private void setFirstPixel(Color pixelColor, byte[] imageWithHeader)
{
pixelColor.R = (byte)ImageConstants.HiddenMessageValue;
pixelColor.G = (byte)ImageConstants.HiddenMessageValue;
pixelColor.B = (byte)ImageConstants.HiddenMessageValue;
PixelUtilities.SetPixelBgra8(imageWithHeader, ImageConstants.FirstX, ImageConstants.FirstX,
pixelColor, this.sourcePicture.Width,
this.sourcePicture.Height);
}
private int updatePixel(IReadOnlyList <byte> bytes, int i, int j, int index)
{
var sourcePixelColor = PixelUtilities.GetPixelBgra8(this.sourcePicture.Pixels, i, j,
this.sourcePicture.Width, this.sourcePicture.Height);
sourcePixelColor.R = bytes[index];
index++;
sourcePixelColor.G = bytes[index];
index++;
sourcePixelColor.B = bytes[index];
index++;
PixelUtilities.SetPixelBgra8(this.sourcePicture.Pixels, i, j, sourcePixelColor,
this.sourcePicture.Width, this.sourcePicture.Height);
return(index);
}
/// <summary>
/// Decrypts the picture.
/// </summary>
/// <param name="extractedImage">The extracted image.</param>
public static void DecryptPicture(Picture extractedImage)
{
for (var i = 0; i < extractedImage.Height / 2; i++)
{
for (var j = 0; j < extractedImage.Width; j++)
{
var currentIndex = i;
var oppositeYValue = (int)(currentIndex + extractedImage.VerticalCenter);
var oppositePixelColor = PixelUtilities.GetPixelBgra8(extractedImage.Pixels, oppositeYValue, j,
extractedImage.Width, extractedImage.Height);
var pixelColor = PixelUtilities.GetPixelBgra8(extractedImage.Pixels, i, j, extractedImage.Width,
extractedImage.Height);
PixelUtilities.SetPixelBgra8(extractedImage.Pixels, i, j, oppositePixelColor, extractedImage.Width,
extractedImage.Height);
PixelUtilities.SetPixelBgra8(extractedImage.Pixels, oppositeYValue, j, pixelColor,
extractedImage.Width, extractedImage.Height);
}
}
}
private void setPixelToClosestQuantizedColor(List <QuantizedColor> colors, Color sourcePixelColor,
double distance, int j, int i)
{
foreach (var quantizedColor in colors)
{
var color = quantizedColor.Color;
var curDist = Math.Pow(color.R - sourcePixelColor.R, 2) +
Math.Pow(color.G - sourcePixelColor.G, 2) +
Math.Pow(color.B - sourcePixelColor.B, 2);
if (curDist < distance)
{
distance = curDist;
var newPixelColor = Color.FromArgb(255, color.R, color.G, color.B);
PixelUtilities.SetPixelBgra8(this.sourcePicture.Pixels, j, i, newPixelColor,
this.sourcePicture.Width,
this.sourcePicture.Height);
}
}
}
/// <summary>
/// Applies the grayscale filter.
/// </summary>
public void applyGrayscaleFilter()
{
for (var i = 0; i < this.sourcePicture.Width - 1; i++)
{
for (var j = 0; j < this.sourcePicture.Height - 1; j++)
{
var sourcePixelColor = PixelUtilities.GetPixelBgra8(this.sourcePicture.Pixels, j, i,
this.sourcePicture.Width,
this.sourcePicture.Height);
var averageColor = (sourcePixelColor.R + sourcePixelColor.G + sourcePixelColor.B) /
ImageConstants.ColorChannelCount;
var averageColorByte = Convert.ToByte(averageColor);
var newPixelColor = Color.FromArgb(this.maxRgbValue, averageColorByte, averageColorByte,
averageColorByte);
PixelUtilities.SetPixelBgra8(this.sourcePicture.Pixels, j, i, newPixelColor,
this.sourcePicture.Width,
this.sourcePicture.Height);
}
}
this.sourcePicture.ModifiedImage =
new WriteableBitmap((int)this.sourcePicture.Width, (int)this.sourcePicture.Height);
}
private static void embedBlackPixel(byte[] pixels, Color sourcePixelColor, int i, int j, Picture sourcePicture)
{
sourcePixelColor.B = (byte)(sourcePixelColor.B & ~1);
PixelUtilities.SetPixelBgra8(pixels, i, j, sourcePixelColor,
sourcePicture.Width, sourcePicture.Height);
}
private static void embedWhitePixel(byte[] pixels, Color sourcePixelColor, int i, int j, Picture sourcePicture)
{
sourcePixelColor.B |= 1;
PixelUtilities.SetPixelBgra8(pixels, i, j, sourcePixelColor, sourcePicture.Width, sourcePicture.Height);
}