This renames the struct `Sequence` to `Strip`.
While the motivation for this partially comes from
the "Sequence Design" #131329, it seems like this
is a good refactor whether the design gets implemented
or not.
The `Sequence` represents what users see as strips in the
VSE. Many places in the code already refere to a `Sequence`
as "strip". It's the C-style "base class" of all strip types.
This also renames the python RNA type `bpy.types.Sequence`
to `bpy.types.Strip` which means that this technically breaks
the python API.
Pull Request: https://projects.blender.org/blender/blender/pulls/132179
Implementing part of design outlined in #126087.
- VSE thumbnail cache has a new implementation, hopefully simpler
and easier to understand.
- Instead of cache key being a VSE strip, frame index, plus
complicated logic for cache items linking etc.,
- The cache is keyed by media file path (if multiple strips
use the same input file, they will share cache entries), frame
index within media file, and any extra data (e.g. steam index
for multi-steam videos)
- Much reduced cache flickering and strange/weird thumbnail choices.
- Likewise, thumbnails no longer disappear-and-reload on operations
like Undo, dragging new video strip into timeline, or F12 render.
- Thumbnails now load faster.
- Images use dedicated/faster thumbnail loading routines when a
format can do that (e.g. JPG and EXR can).
- Movies reuse ffmpeg decoding context for neighboring strips
that use the same file (as often happens when cutting footage)
- Thumbnail requests are processed on several threads now too.
Images and more detail in PR.
Pull Request: https://projects.blender.org/blender/blender/pulls/126405
Match function and declaration names, picking names based on
consistency with related code & clarity.
Also changes for old conventions, missed in previous cleanups:
- name -> filepath
- tname -> newname
- maxlen -> maxncpy
