v0.2.1

Added

• (Windows) Build script by default assumes that libheif installed in C:\vcpkg\installed\x64-windows, if VCPKG_PREFIX environment is missing.
• (Heif) reader_add_thumbnail and reader_remove_image examples.
• (Heif) to_pillow method and adjusted examples to use it.

Changed

• (Heif) Removed HeifSaveMask, get_img_thumb_mask_for_save that was previously introduced, instead added __delitem__ to HeifFile.
• All thumbnails encoding features reworked, to simplify api. See add_thumbnails methods in HeifFile and HeifImage classes.

Fixed

• (HeifImagePlugin) Fixed palette images with bytes transparency conversion. #21 (@Jarikf)
• (Heif) Raises ValueError when trying to save empty(no images) file.
• (HeifImagePlugin) Skips images with sizes = 0 during save, if there is no images, raise ValueError.
• (HeifImagePlugin) Memory optimizations, when there is only one image in file.
• Added licenses for libraries in binary wheels.
• (Windows) Fix docs for building and developing.
• (Heif) add_from_pillow method, now adds thumbnails from Pillow if it is HeifImageFile(ImageFile.ImageFile) class.