Image to display with SubSamplingImage. Can be one of:
SubSamplingImageSource.file
SubSamplingImageSource.asset
SubSamplingImageSource.resource
SubSamplingImageSource.contentUri
SubSamplingImageSource.rawSource
A preview that can be displayed immediately while the bitmap tiles are loaded, which can be slightly slow depending on the file size.
Check whether an image source can be sub-sampled and decoded using AndroidImageRegionDecoder.
Called when the image is no longer visible.
Check whether an image source exists and has non-zero bytes.