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lottie: shapes support in text range selector

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@issue: #2178
This commit is contained in:
Mira Grudzinska 2024-11-12 14:17:39 +01:00 • committed by Hermet Park
parent 483b40c78e
commit b3c1c33285
1 changed files with 40 additions and 8 deletions
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48
src/loaders/lottie/tvgLottieModel.cpp
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@ -137,15 +137,47 @@ float LottieTextRange::factor(float frameNo, float totalLen, float idx)
auto f = 0.0f;
auto smoothness = this->smoothness(frameNo);
if (tvg::zero(smoothness)) f = idx >= nearbyintf(start) && idx < nearbyintf(end) ? 1.0f : 0.0f;
else {
if (idx >= std::floor(start)) {
auto diff = idx - start;
f = diff < 0.0f ? std::min(end, 1.0f) + diff : end - idx;
switch (this->shape) {
case Square: {
auto smoothness = this->smoothness(frameNo);
if (tvg::zero(smoothness)) f = idx >= nearbyintf(start) && idx < nearbyintf(end) ? 1.0f : 0.0f;
else {
if (idx >= std::floor(start)) {
auto diff = idx - start;
f = diff < 0.0f ? std::min(end, 1.0f) + diff : end - idx;
}
smoothness *= 0.01f;
f = (f - (1.0f - smoothness) * 0.5f) / smoothness;
}
break;
}
case RampUp: {
f = tvg::equal(start, end) ? (idx >= end ? 1.0f : 0.0f) : (0.5f + idx - start) / (end - start);
break;
}
case RampDown: {
f = tvg::equal(start, end) ? (idx >= end ? 0.0f : 1.0f) : 1.0f - (0.5f + idx - start) / (end - start);
break;
}
case Triangle: {
f = tvg::equal(start, end) ? 0.0f : 2.0f * (0.5f + idx - start) / (end - start);
f = f < 1.0f ? f : 2.0f - f;
break;
}
case Round: {
idx += 0.5f - start;
clamp(idx, 0.0f, end - start);
auto range = 0.5f * (end - start);
auto t = idx - range;
f = tvg::equal(start, end) ? 0.0f : sqrtf(1.0f - t * t / (range * range));
break;
}
case Smooth: {
idx += 0.5f - start;
clamp(idx, 0.0f, end - start);
f = tvg::equal(start, end) ? 0.0f : 0.5f * (1.0f + cosf(MATH_PI * (1.0f + 2.0f * idx / (end - start))));
break;
}
smoothness *= 0.01f;
f = (f - (1.0f - smoothness) * 0.5f) / smoothness;
}
clamp(f, 0.0f, 1.0f);