/// <summary>
/// Encodes a message into the loaded image.
/// </summary>
/// <param name="message"></param>
public void EncodeMessage(string message, Stream outStream)
{
if (!IsImageLoaded)
{
throw new InvalidOperationException("No source image has been loaded.");
}
byte[] messageBytes = CharacterEncoding.GetBytes(message);
if (messageBytes.Length > AvailableMessageBytes)
{
throw new InvalidOperationException(
string.Format("Unable to fit message. Message is {0} bytes, and only {1} bytes are available.",
messageBytes.Length,
AvailableMessageBytes)
);
}
MessagePosition = 0;
EndOfMessageReached = false;
using (FastBitmap bitmap = new FastBitmap(SourceImage.Image))
{
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
WriteBytesToPixel(bitmap, messageBytes, x, y);
if (EndOfMessageReached)
{
break;
}
}
if (EndOfMessageReached)
{
break;
}
}
}
SourceImage.Save(outStream);
}
