private async void OnSourceImageFileChanged()
{
if (_isTemplateLoaded && SourceImageFile != null)
{
// Ensure the stream is disposed once the image is loaded
using (IRandomAccessStream fileStream = await SourceImageFile.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);
this.sourceImagePixelHeight = decoder.PixelHeight;
this.sourceImagePixelWidth = decoder.PixelWidth;
}
if (this.sourceImagePixelHeight < 2 * 30 ||
this.sourceImagePixelWidth < 2 * 30)
{
}
else
{
double sourceImageScale = 1;
if (this.sourceImagePixelHeight < this.ActualHeight &&
this.sourceImagePixelWidth < this.ActualWidth)
{
this.sourceImage.Stretch = Windows.UI.Xaml.Media.Stretch.None;
}
else
{
sourceImageScale = Math.Min(this.ActualWidth / this.sourceImagePixelWidth,
this.ActualHeight / this.sourceImagePixelHeight);
this.sourceImage.Stretch = Windows.UI.Xaml.Media.Stretch.Uniform;
}
this.sourceImage.Source = await BitmapHelper.GetCroppedBitmapAsync(
this.SourceImageFile,
new Point(0, 0),
new Size(this.sourceImagePixelWidth, this.sourceImagePixelHeight),
sourceImageScale);
}
}
}