/// <summary>
/// Embeds the text message in image.
/// </summary>
/// @Precondition none
/// @Postcondition the message is embedded into the image
/// <param name="messageData">The message data.</param>
/// <param name="messageLength">Length of the message.</param>
/// <param name="messageImageHeight">Height of the message image.</param>
/// <param name="sourceImageWidth">Width of the source image.</param>
/// <param name="sourceImageHeight">Height of the source image.</param>
/// <param name="encryptionIsChecked">if set to <c>true</c> [encryption is selected].</param>
/// <param name="bpcc">The BPCC.</param>
/// <returns>Task</returns>
/// <exception cref="NotImplementedException"></exception>
public override async Task EmbedMessageInImage(byte[] messageData, uint messageLength, uint messageImageHeight,
uint sourceImageWidth, uint sourceImageHeight, bool encryptionIsChecked, int bpcc)
{
var totalAvailableSourcePixels = sourceImageWidth * sourceImageHeight - 2;
this.currentByteIndex = 0;
var numberOfBits = messageData.Length * this.numberOfBitsInByte;
if (numberOfBits / bpcc > totalAvailableSourcePixels * PixelConstants.NumberOfColorChannels)
{
var requiredBpcc = this.calculateBpccRequiredToEmbedText(numberOfBits, totalAvailableSourcePixels);
if (requiredBpcc > this.numberOfBitsInByte)
{
await Dialogs.ShowNotPossibleToEmbedTextDialog();
}
else
{
await Dialogs.ShowRequiredBpccToEmbedTextDialog(requiredBpcc);
}
MessageTooLarge = true;
return;
}
var currentIndex = 0;
for (var currY = 0; currY < sourceImageHeight; currY++)
{
for (var currX = 0; currX < sourceImageWidth; currX++)
{
var sourcePixelColor =
PixelColorInfo.GetPixelBgra8(SourceImagePixels, currY, currX, sourceImageWidth);
if (IsFirstPixel(currX, currY))
{
sourcePixelColor = HeaderPixelFormatter.FormatFirstHeaderPixel(sourcePixelColor);
}
else if (IsSecondPixel(currX, currY))
{
sourcePixelColor = HeaderPixelFormatter.FormatSecondHeaderPixel(FileTypes.Text,
sourcePixelColor, encryptionIsChecked, bpcc);
}
else
{
sourcePixelColor = this.embedTextMessage(messageData, sourcePixelColor, currentIndex, bpcc);
currentIndex += PixelConstants.NumberOfColorChannels * bpcc;
}
PixelColorInfo.SetPixelBgra8(SourceImagePixels, currY, currX, sourcePixelColor, sourceImageWidth);
}
}
await SetEmbeddedImage(sourceImageHeight, sourceImageWidth);
}
/// <summary>
/// Embeds the message in image.
/// </summary>
/// @Precondition none
/// @Postcondition the message is embedded into the image
/// <param name="messagePixels">The message pixels.</param>
/// <param name="messageImageWidth">Width of the message image.</param>
/// <param name="messageImageHeight">Height of the message image.</param>
/// <param name="sourceImageWidth">Width of the source image.</param>
/// <param name="sourceImageHeight">Height of the source image.</param>
/// <param name="encryptionIsChecked">if set to <c>true</c> [encryption is checked].</param>
/// <param name="bpcc">The BPCC.</param>
public override async Task EmbedMessageInImage(byte[] messagePixels, uint messageImageWidth,
uint messageImageHeight, uint sourceImageWidth, uint sourceImageHeight, bool encryptionIsChecked, int bpcc)
{
this.isEncrypted = encryptionIsChecked;
if (messageImageWidth > sourceImageWidth || messageImageHeight > sourceImageHeight)
{
await Dialogs.ShowMessageFileTooLargeDialog();
MessageTooLarge = true;
return;
}
for (var currY = 0; currY < sourceImageHeight; currY++)
{
for (var currX = 0; currX < sourceImageWidth; currX++)
{
var sourcePixelColor =
PixelColorInfo.GetPixelBgra8(SourceImagePixels, currY, currX, sourceImageWidth);
if (IsFirstPixel(currX, currY))
{
sourcePixelColor = HeaderPixelFormatter.FormatFirstHeaderPixel(sourcePixelColor);
}
else if (IsSecondPixel(currX, currY))
{
sourcePixelColor = HeaderPixelFormatter.FormatSecondHeaderPixel(FileTypes.Bitmap,
sourcePixelColor, encryptionIsChecked, bpcc);
}
else
{
sourcePixelColor = this.embedMonochromeImage(currX, messageImageWidth, currY,
messageImageHeight, messagePixels, sourcePixelColor);
}
PixelColorInfo.SetPixelBgra8(SourceImagePixels, currY, currX, sourcePixelColor, sourceImageWidth);
}
}
await SetEmbeddedImage(sourceImageHeight, sourceImageWidth);
}
