public async Task <Stream> PickImage(ImageLocation location = ImageLocation.All, int maxSize = int.MaxValue)
{
var raw = await PickImageRaw(location);
if (raw == null)
{
return(null);
}
using (var stream = await raw.OpenReadAsync())
{
var decoder = await BitmapDecoder.CreateAsync(stream);
var size = MediaHelper.Crop((int)decoder.PixelWidth, (int)decoder.PixelHeight, maxSize);
if (size.Item1 != decoder.PixelWidth || size.Item2 != decoder.PixelHeight)
{
var ms = new InMemoryRandomAccessStream();
var encoder = await BitmapEncoder.CreateForTranscodingAsync(ms, decoder);
encoder.BitmapTransform.ScaledWidth = (uint)size.Item1;
encoder.BitmapTransform.ScaledHeight = (uint)size.Item2;
await encoder.FlushAsync();
return(ms.AsStreamForRead());
}
}
return(await raw.OpenStreamForReadAsync());
}
private static UIImage ResizeImage(UIImage image, int maxSize)
{
var newSize = MediaHelper.Crop((int)image.Size.Width, (int)image.Size.Height, maxSize);
var rect = new CGRect(0, 0, newSize.Item1, newSize.Item2);
rect = rect.Integral();
UIGraphics.BeginImageContextWithOptions(new CGSize(rect.Width, rect.Height), false, image.CurrentScale);
image.Draw(rect);
var resizedImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(resizedImage);
}