string GetUri(object imageSource)
{
if (imageSource == null)
{
return(null);
}
string uri = imageSource as string;
if (uri != null)
{
return(uri);
}
ImageSource convertedSource;
if (!ImageSourceFactory.TryCreateImageSource(imageSource, 0, 0, out convertedSource))
{
return(null);
}
AbstractProperty uriProperty;
if (TryGetUriProperty(convertedSource, out uriProperty))
{
return(uriProperty.GetValue() as string);
}
ServiceRegistration.Get <ILogger>().Warn("ImageSourceWrapper: Unsupported ImageSource type '{0}'", imageSource.GetType());
return(null);
}
/// <summary>
/// Loads an ImageSource and allows control of thumbnail use.
/// Morpheus_xx, 2011-12-13: For fallback sources no thumbnails should be used, because ALL thumbs are created as JPG. This currenly causes an issue:
/// Source -> no thumbnail created -> FallbackSource (PNG) -> creates a JPG thumbnail, so Alpha-Channel of FallbackSource is lost.
/// TODO: Image class and thumbnail handling should be refactored to allow more control about image formats and thumbs usage.
/// </summary>
/// <param name="source">Source</param>
/// <param name="allowThumbs">True to allow building a thumbnail of given source</param>
/// <returns>ImageSource or null</returns>
protected ImageSource LoadImageSource(object source, bool allowThumbs)
{
if (source == null)
{
return(null);
}
bool thumbnail = allowThumbs && Thumbnail;
ImageSource imageSource;
if (ImageSourceFactory.TryCreateImageSource(source, (int)Width, (int)Height, out imageSource))
{
return(imageSource);
}
string uriSource = source as string;
if (!string.IsNullOrEmpty(uriSource))
{
// Remember to adapt list of supported extensions for image player plugin...
if (IsValidSource(uriSource))
{
BitmapImageSource bmi = new BitmapImageSource {
UriSource = uriSource, Thumbnail = thumbnail
};
if (thumbnail)
{
// Set the requested thumbnail dimension, to use the best matching format.
// Note: Math.Max returns NaN if one argument is NaN (which casts to int.MinValue), so the additional Max with 0 catches this
bmi.ThumbnailDimension = Math.Max((int)Math.Max(Width, Height), 0);
}
return(bmi);
}
// TODO: More image types
}
string warnSource = source.ToString();
if (_formerWarnURI != warnSource)
{
if (!string.IsNullOrEmpty(warnSource))
{
ServiceRegistration.Get <ILogger>().Warn("Image: Image source '{0}' is not supported", warnSource);
}
// Remember if we already wrote a warning to the log to avoid log flooding
_formerWarnURI = warnSource;
}
return(null);
}