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Code Issues Projects Releases Packages Wiki Activity Actions 5

loader/lottie: support hold interpolation.

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This commit is contained in:
Hermet Park 2023-09-02 15:52:52 +09:00
parent aa0ca8dc78
commit ac8f3b8be6
2 changed files with 15 additions and 1 deletions
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4
src/loaders/lottie/tvgLottieParser.cpp
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@ -384,7 +384,7 @@ void LottieParser::parseKeyFrame(T& prop)
Point inTangent, outTangent;
const char* interpolatorKey = nullptr;
auto& frame = prop.newFrame();
bool interpolator = false;
auto interpolator = false;
enterObject();
@ -415,6 +415,8 @@ void LottieParser::parseKeyFrame(T& prop)
getValue(frame2.value);
} else if (parseTangent(key, frame)) {
continue;
} else if (!strcmp(key, "h")) {
frame.hold = getInt();
} else skip(key);
}

12
src/loaders/lottie/tvgLottieProperty.h
View file

@ -94,11 +94,17 @@ struct LottieScalarFrame
T value; //keyframe value
int32_t no; //frame number
LottieInterpolator* interpolator;
bool hold = false; //do not interpolate.
T interpolate(LottieScalarFrame<T>* next, int32_t frameNo)
{
auto t = float(frameNo - no) / float(next->no - no);
if (interpolator) t = interpolator->progress(t);
if (hold) {
if (t < 1.0f) return value;
else return next->value;
}
return mathLerp(value, next->value, t);
}
};
@ -113,12 +119,18 @@ struct LottieVectorFrame
T outTangent, inTangent;
float length;
bool hasTangent = false;
bool hold = false;
T interpolate(LottieVectorFrame* next, int32_t frameNo)
{
auto t = float(frameNo - no) / float(next->no - no);
if (interpolator) t = interpolator->progress(t);
if (hold) {
if (t < 1.0f) return value;
else return next->value;
}
if (hasTangent) {
Bezier bz = {value, value + outTangent, next->value + inTangent, next->value};
t = bezAt(bz, t * length, length);