92ec801a2b
AE discriminates [1] between basic 2-dimensional properties
(PropertyValueType.TwoD - e.g. scale), and spatial 2D properties
(PropertyValueType.TwoD_SPATIAL - e.g. position).
For the latter it provides additional keyframe controls (tangent in &
tangent out) to describe a non-linear interpolation path ("spatial
interpolation"). This composes on top of the usual temporal
interpolation (with its own optional cubic mapping).
To support spatial interpolation:
- introduce a new Skottie value type (Vec2Value), to represent
TwoD and TwoD_SPATIAL properties
- introduce a KeyframeAnimator specialization for Vec2Value, which
tracks per-keyframe tangent information
- for spatial keyframes, instantiate/store an SkContourMeasure, and
use instead of straight Vec2 LERP
- switch interesting 2D properties to the new value type (transform
position, anchor point, scale)
(we could look into separating TwoD/TwoD_SPATIAL if needed, but the new
specialization is already more efficient than the old
opaque-vector-with-late-binding approach)
[1] http://docs.aenhancers.com/properties/property/#property-propertyvaluetype
Change-Id: I0863fd970cec4c5ff15cf01b2fb5c6602a468179
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274283
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
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