/// <summary>
/// Loads the message.
/// @Precondition none
/// @Postcondition message file is loaded into the program
/// </summary>
public async Task LoadMessage()
{
this.messageFile = await this.fileReader.SelectMessageFile();
if (this.messageFile == null)
{
return;
}
if (this.MessageFileType.Equals(FileTypeConstants.TextFileType))
{
this.messageEmbedder = new TextMessageEmbedder();
this.TextFromFile = await this.fileReader.ReadTextFromFile(this.messageFile);
}
else
{
this.messageEmbedder = new MonochromeImageEmbedder();
this.MessageImage = await FileBitmapConverter.ConvertFileToBitmap(this.messageFile);
}
if (this.SourceImage != null)
{
var sourceImagePixels = await PixelExtracter.ExtractPixelDataFromFile(this.sourceImageFile);
this.messageEmbedder.SourceImagePixels = sourceImagePixels;
}
}
/// <summary>
/// Loads the embedded image
/// </summary>
/// @Precondition none
/// @Postcondition embedded image is loaded
public async Task LoadEmbeddedImage()
{
this.EmbeddedImageFile = await this.fileReader.SelectSourceImageFile();
if (this.EmbeddedImageFile == null)
{
return;
}
this.EmbeddedImage = await FileBitmapConverter.ConvertFileToBitmap(this.EmbeddedImageFile);
}
/// <summary>
/// Loads the source image.
/// @Precondition none
/// @Postcondition source image is loaded into the program
/// </summary>
public async Task LoadSourceImage()
{
this.sourceImageFile = await this.fileReader.SelectSourceImageFile();
if (this.sourceImageFile == null)
{
return;
}
var sourceImage = await FileBitmapConverter.ConvertFileToBitmap(this.sourceImageFile);
this.SourceImage = sourceImage;
var sourceImagePixels = await PixelExtracter.ExtractPixelDataFromFile(this.sourceImageFile);
this.messageEmbedder.SourceImagePixels = sourceImagePixels;
await this.setSourceImageSizeValues();
}
/// <summary>
/// Extracts the pixel data from file.
/// </summary>
/// <param name="file">The file.</param>
/// <returns>The byte array of pixel information from the file</returns>
public static async Task <byte[]> ExtractPixelDataFromFile(StorageFile file)
{
var copyBitmapImage = await FileBitmapConverter.ConvertFileToBitmap(file);
using (var fileStream = await file.OpenAsync(FileAccessMode.Read))
{
var decoder = await BitmapDecoder.CreateAsync(fileStream);
var transform = new BitmapTransform {
ScaledWidth = Convert.ToUInt32(copyBitmapImage.PixelWidth),
ScaledHeight = Convert.ToUInt32(copyBitmapImage.PixelHeight)
};
var pixelData = await decoder.GetPixelDataAsync(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Straight,
transform,
ExifOrientationMode.IgnoreExifOrientation,
ColorManagementMode.DoNotColorManage
);
return(pixelData.DetachPixelData());
}
}
