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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 "SkottieAnimator.h"
namespace skottie {
namespace {
SkScalar lerp_scalar(float v0, float v1, float t) {
SkASSERT(t >= 0 && t <= 1);
return v0 * (1 - t) + v1 * t;
}
} // namespace
bool KeyframeIntervalBase::parse(const Json::Value& k, KeyframeIntervalBase* prev) {
SkASSERT(k.isObject());
fT0 = fT1 = ParseDefault(k["t"], SK_ScalarMin);
if (fT0 == SK_ScalarMin) {
return false;
}
if (prev) {
if (prev->fT1 >= fT0) {
SkDebugf("!! Dropping out-of-order key frame (t: %f < t: %f)\n", fT0, prev->fT1);
return false;
}
// Back-fill t1 in prev interval. Note: we do this even if we end up discarding
// the current interval (to support "t"-only final frames).
prev->fT1 = fT0;
}
fHold = ParseDefault(k["h"], false);
if (!fHold) {
// default is linear lerp
static constexpr SkPoint kDefaultC0 = { 0, 0 },
kDefaultC1 = { 1, 1 };
const auto c0 = ParseDefault(k["i"], kDefaultC0),
c1 = ParseDefault(k["o"], kDefaultC1);
if (c0 != kDefaultC0 || c1 != kDefaultC1) {
fCubicMap = skstd::make_unique<SkCubicMap>();
// TODO: why do we have to plug these inverted?
fCubicMap->setPts(c1, c0);
}
}
return true;
}
float KeyframeIntervalBase::localT(float t) const {
SkASSERT(this->isValid());
SkASSERT(!this->isHold());
SkASSERT(t > fT0 && t < fT1);
auto lt = (t - fT0) / (fT1 - fT0);
return fCubicMap ? fCubicMap->computeYFromX(lt) : lt;
}
template <>
void KeyframeInterval<ScalarValue>::lerp(float t, ScalarValue* v) const {
const auto lt = this->localT(t);
*v = lerp_scalar(fV0, fV1, lt);
}
template <>
void KeyframeInterval<VectorValue>::lerp(float t, VectorValue* v) const {
SkASSERT(fV0.size() == fV1.size());
SkASSERT(v->size() == 0);
const auto lt = this->localT(t);
v->reserve(fV0.size());
for (size_t i = 0; i < fV0.size(); ++i) {
v->push_back(lerp_scalar(fV0[i], fV1[i], lt));
}
}
template <>
void KeyframeInterval<ShapeValue>::lerp(float t, ShapeValue* v) const {
SkASSERT(fV0.countVerbs() == fV1.countVerbs());
SkASSERT(v->isEmpty());
const auto lt = this->localT(t);
SkAssertResult(fV1.interpolate(fV0, lt, v));
v->setIsVolatile(true);
}
} // namespace skottie
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