async Task<IBitmap> Download(Uri uri, DesiredImageSize desiredSize) {
return await _downloader.GetImage(uri, _defaultCacheTime, desiredSize);
}
async Task<BitmapSource> BmiFromUrlAsync(Uri uri, DesiredImageSize desiredSize) {
using (var bitMap = await Download(uri, desiredSize).ConfigureAwait(false))
return GetBitMapFromMemoryStream(bitMap);
}
public IObservable<IBitmap> GetImage(Uri uri, TimeSpan offset, DesiredImageSize desiredDimensions) {
var url = uri.ToString();
return _cache.LoadImageFromUrl(GetDimensionKey(uri, desiredDimensions), url, false, desiredDimensions.Width,
desiredDimensions.Height,
GetAbsoluteUtc(offset));
}
static string GetDimensionKey(Uri uri, DesiredImageSize desiredDimensions) {
return uri + "??dimensions=" + desiredDimensions;
}
public IObservable<IBitmap> GetImage(Uri uri, DesiredImageSize desiredDimensions) {
return _cache.LoadImageFromUrl(GetDimensionKey(uri, desiredDimensions), uri.ToString(), false,
desiredDimensions.Width, desiredDimensions.Height);
}