Blender Git Commit Log

Multi-previews: basics (not yet usable from end-user code).

This commits adds data and basic API needed to handle multi-previews in
a single PreviewImage struct.

Data model is designed to be fully compatible (backward and forward)
with previous one, while keeping a 'flat array' design to store
previews. It also adds an extra integer per frame, that may be used to
store various meta-data.

This commit also updates write/read code, and adds basic BKE API to handle
multiple frames.

TODO: UI code (only very minimal stuff done so far, probably want to add
some template options too...). Access between icon ID and preview frames
is not yet fully designed, but think will rather go with an extra
integer rather that generating an icon ID/icon struct for every frame.