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authorGravatar Florin Malita <fmalita@chromium.org>2017-12-30 12:27:00 -0500
committerGravatar Skia Commit-Bot <skia-commit-bot@chromium.org>2017-12-30 22:55:39 +0000
commit094ccde2380bfbb615e25d0d80208148fcd47f17 (patch)
treed6233c61996a3f268938953608b0b3a2d4590e07 /experimental/skotty/SkottyAnimator.cpp
parent83b2b08afcf903a455cd0ea999d0c2936088fffd (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.cpp59
1 files changed, 59 insertions, 0 deletions
diff --git a/experimental/skotty/SkottyAnimator.cpp b/experimental/skotty/SkottyAnimator.cpp
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+++ b/experimental/skotty/SkottyAnimator.cpp
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+/*
+ * 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