9e1c58cb6a
TBR= Change-Id: I2849c1438a8b245f04a01977919b653f0a16492b Reviewed-on: https://skia-review.googlesource.com/92380 Reviewed-by: Florin Malita <fmalita@chromium.org> Commit-Queue: Florin Malita <fmalita@chromium.org>
95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkottyAnimator.h"
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namespace skotty {
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namespace {
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SkScalar lerp_scalar(float v0, float v1, float t) {
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SkASSERT(t >= 0 && t <= 1);
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return v0 * (1 - t) + v1 * t;
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}
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} // namespace
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bool KeyframeIntervalBase::parse(const Json::Value& k, KeyframeIntervalBase* prev) {
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SkASSERT(k.isObject());
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fT0 = fT1 = ParseScalar(k["t"], SK_ScalarMin);
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if (fT0 == SK_ScalarMin) {
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return false;
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}
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if (prev) {
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if (prev->fT1 >= fT0) {
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LOG("!! Dropping out-of-order key frame (t: %f < t: %f)\n", fT0, prev->fT1);
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return false;
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}
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// Back-fill t1 in prev interval. Note: we do this even if we end up discarding
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// the current interval (to support "t"-only final frames).
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prev->fT1 = fT0;
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}
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// default is linear lerp
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static constexpr SkPoint kDefaultC0 = { 0, 0 },
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kDefaultC1 = { 1, 1 };
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const auto c0 = ParsePoint(k["i"], kDefaultC0),
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c1 = ParsePoint(k["o"], kDefaultC1);
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if (c0 != kDefaultC0 || c1 != kDefaultC1) {
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fCubicMap = skstd::make_unique<SkCubicMap>();
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// TODO: why do we have to plug these inverted?
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fCubicMap->setPts(c1, c0);
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}
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return true;
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}
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float KeyframeIntervalBase::localT(float t) const {
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SkASSERT(this->isValid());
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auto lt = (t - fT0) / (fT1 - fT0);
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if (fCubicMap) {
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lt = fCubicMap->computeYFromX(lt);
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}
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return SkTPin<float>(lt, 0, 1);
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}
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template <>
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void KeyframeInterval<ScalarValue>::lerp(float t, ScalarValue* v) const {
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const auto lt = this->localT(t);
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*v = lerp_scalar(fV0, fV1, lt);
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}
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template <>
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void KeyframeInterval<VectorValue>::lerp(float t, VectorValue* v) const {
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SkASSERT(fV0.size() == fV1.size());
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SkASSERT(v->size() == 0);
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const auto lt = this->localT(t);
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v->reserve(fV0.size());
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for (size_t i = 0; i < fV0.size(); ++i) {
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v->push_back(lerp_scalar(fV0[i], fV1[i], lt));
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}
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}
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template <>
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void KeyframeInterval<ShapeValue>::lerp(float t, ShapeValue* v) const {
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SkASSERT(fV0.countVerbs() == fV1.countVerbs());
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SkASSERT(v->isEmpty());
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const auto lt = this->localT(t);
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SkAssertResult(fV1.interpolate(fV0, lt, v));
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v->setIsVolatile(true);
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}
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} // namespace skotty
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