/// <summary>
/// Combines the images to one big image.
/// </summary>
/// <param name="infos">Tuple containing the image
/// and text to stitch together.</param>
/// <returns>Task.</returns>
private async Task <PngBitmapEncoder> StitchImagesTogether(List <Tuple <Uri, string> > infos)
{
BitmapFrame[] frames = new BitmapFrame[infos.Count];
for (int i = 0; i < frames.Length; i++)
{
frames[i] = BitmapDecoder.Create(infos[i].Item1 ?? (SelectedCollageType == CollageType.Albums ? new Uri("pack://application:,,,/Resources/noalbumimage.png") : new Uri("pack://application:,,,/Resources/noartistimage.png")), BitmapCreateOptions.None, BitmapCacheOption.OnDemand).Frames.First();
}
OnStatusUpdated("Downloading images...");
while (frames.Any(f => f.IsDownloading))
{
await Task.Delay(100);
}
int imageWidth = frames[0].PixelWidth;
int imageHeight = frames[0].PixelHeight;
int col = (int)SelectedCollageSize;
DrawingVisual dv = new DrawingVisual();
using (DrawingContext dc = dv.RenderOpen())
{
int cnt = 0;
for (int y = 0; y < col; y++)
{
for (int x = 0; x < col; x++)
{
dc.DrawImage(frames[cnt], new Rect(x * imageWidth, y * imageHeight, imageWidth, imageHeight));
if (!string.IsNullOrEmpty(infos[cnt].Item2))
{
// create text
FormattedText extraText = new FormattedText(infos[cnt].Item2, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, new Typeface("Verdana"), 14, Brushes.Black)
{
MaxTextWidth = imageWidth,
MaxTextHeight = imageHeight
};
dc.DrawText(extraText, new Point(x * imageWidth + 1, y * imageHeight + 1));
extraText.SetForegroundBrush(Brushes.White);
dc.DrawText(extraText, new Point(x * imageWidth, y * imageHeight));
}
cnt++;
}
}
}
// Converts the Visual (DrawingVisual) into a BitmapSource
RenderTargetBitmap bmp = new RenderTargetBitmap(imageWidth * col, imageHeight * col, 96, 96, PixelFormats.Pbgra32);
bmp.Render(dv);
// Creates a PngBitmapEncoder and adds the BitmapSource to the frames of the encoder
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmp));
return(encoder);
}