diff options
author | Florin Malita <fmalita@chromium.org> | 2017-12-30 12:27:00 -0500 |
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committer | Skia Commit-Bot <skia-commit-bot@chromium.org> | 2017-12-30 22:55:39 +0000 |
commit | 094ccde2380bfbb615e25d0d80208148fcd47f17 (patch) | |
tree | d6233c61996a3f268938953608b0b3a2d4590e07 /experimental/skotty/SkottyAnimator.cpp | |
parent | 83b2b08afcf903a455cd0ea999d0c2936088fffd (diff) |
Initial Lottie loader impl (Skotty)
Coarse workflow:
* Construction
1) build a Json tree
2) collect asset IDs (for preComp/image layer resolution)
3) "attach" pass
- traverse the Json tree
- build an SkSG dom, one fragment at a time
- attach "animator" objects to the dom, for each animated prop
4) done, we can throw away the Json tree
* For each animation tick
1) iterate over active animators and poke their respective dom nodes/attributes
2) revalidate the SkSG dom
3) draw the SkSG dom
Note: post construction, things are super-simple - we just poke SkSG DOM attributes
with interpolated values, and everything else is handled by SkSG (invalidation,
revalidation, render).
Change-Id: I96a02be7eb4fb4cb3831f59bf2b3908ea190c0dd
Reviewed-on: https://skia-review.googlesource.com/89420
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Diffstat (limited to 'experimental/skotty/SkottyAnimator.cpp')
-rw-r--r-- | experimental/skotty/SkottyAnimator.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/experimental/skotty/SkottyAnimator.cpp b/experimental/skotty/SkottyAnimator.cpp new file mode 100644 index 0000000000..e08cf35995 --- /dev/null +++ b/experimental/skotty/SkottyAnimator.cpp @@ -0,0 +1,59 @@ +/* + * Copyright 2017 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "SkottyAnimator.h" + +namespace skotty { + +namespace { + +SkScalar lerp_scalar(SkScalar v0, SkScalar v1, float t) { + SkASSERT(t >= 0 && t <= 1); + return v0 * (1 - t) + v1 * t; +} + +SkPoint lerp_point(const SkPoint& v0, const SkPoint& v1, float t) { + SkASSERT(t >= 0 && t <= 1); + return SkPoint::Make(lerp_scalar(v0.x(), v1.x(), t), + lerp_scalar(v0.y(), v1.y(), t)); +} + +} // namespace + +template <> +void KeyframeInterval<ScalarValue>::lerp(float t, ScalarValue* v) const { + *v = lerp_scalar(fV0, fV1, t); +} + +template <> +void KeyframeInterval<VectorValue>::lerp(float t, VectorValue* v) const { + SkASSERT(fV0.cardinality() == fV1.cardinality()); + SkASSERT(v->cardinality() == 0); + + v->fVals.reserve(fV0.cardinality()); + for (int i = 0; i < fV0.fVals.count(); ++i) { + v->fVals.emplace_back(lerp_scalar(fV0.fVals[i], fV1.fVals[i], t)); + } +} + +template <> +void KeyframeInterval<ShapeValue>::lerp(float t, ShapeValue* v) const { + SkASSERT(fV0.cardinality() == fV1.cardinality()); + SkASSERT(v->cardinality() == 0); + + v->fVertices.reserve(fV0.cardinality()); + for (int i = 0; i < fV0.fVertices.count(); ++i) { + v->fVertices.push_back( + BezierVertex({ + lerp_point(fV0.fVertices[i].fInPoint , fV1.fVertices[i].fInPoint , t), + lerp_point(fV0.fVertices[i].fOutPoint, fV1.fVertices[i].fOutPoint, t), + lerp_point(fV0.fVertices[i].fVertex , fV1.fVertices[i].fVertex , t) + })); + } +} + +} // namespace skotty |