Bugfix release

• Fix reading 'url' boxes
• Fix two compilation problems

Save thumbnails / Exif / XMP, reader interface

Can now generate HEIF files with

• thumbnails
• Exif data
• XMP data

Defines a reader interface to read input data directly from custom sources.

Gnome Thumbnailer / C++ API

• HEIF thumbnailer for Gnome
• support for XMP metadata
• C++ API
• Go API (experimental)
• compilation fixes for various systems

HEIF writer

First implementation of HEIF encoder based on x265.
Supports alpha channels and lossless compression

First still-image decoder release

HEIF still-image decoder with support for

• tiled images
• alpha channels
• thumbnails
• EXIF/XMP data
• depth channels
• multiple images in a HEIF file
• image transformations (crop, mirror, rotate)
• overlay images