Utility elements for image uploads.

File pickers, image preview, and exif parsing implemented. Upload is left as an exercise for the reader.

image upload consists of 3 steps:

1. file pickers:

   • drag'n'drop mixin
   • file picker button

2. display files and metadata

   • parse metadata on worker thread
   • display image from thumbnail, or scaled original image
   • rotate images
   • optional: throttle thumbnail creation to prevent memory overflow

3. upload file

   • ajax calls over the network

image-upload-icon: fit is wrong on IE, does not support object-fit tag