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LibWeb: Extract SLERP algorithm into its own method

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No functional changes.
This commit is contained in:
Tim Ledbetter 2025-07-21 23:42:53 +01:00 • committed by Sam Atkins
commit cf33dec6d6
Notes: github-actions[bot] 2025-07-22 10:11:25 +00:00
1 changed files with 16 additions and 15 deletions
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31
Libraries/LibWeb/CSS/Interpolation.cpp
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@ -162,6 +162,21 @@ static RefPtr<CSSStyleValue const> interpolate_translate(DOM::Element& element,
move(new_values));
}
// https://drafts.csswg.org/css-transforms-2/#interpolation-of-decomposed-3d-matrix-values
static FloatVector4 slerp(FloatVector4 const& from, FloatVector4 const& to, float delta)
{
auto product = from.dot(to);
product = clamp(product, -1.0f, 1.0f);
if (fabsf(product) >= 1.0f)
return from;
auto theta = acosf(product);
auto w = sinf(delta * theta) / sqrtf(1 - (product * product));
return from * (cosf(delta * theta) - (product * w)) + to * w;
}
ValueComparingRefPtr<CSSStyleValue const> interpolate_property(DOM::Element& element, PropertyID property_id, CSSStyleValue const& a_from, CSSStyleValue const& a_to, float delta, AllowDiscrete allow_discrete)
{
auto from = with_keyword_values_resolved(element, property_id, a_from);
@ -555,21 +570,7 @@ RefPtr<CSSStyleValue const> interpolate_transform(DOM::Element& element, CSSStyl
// https://drafts.csswg.org/css-transforms-2/#interpolation-of-decomposed-3d-matrix-values
static constexpr auto interpolate = [](DecomposedValues& from, DecomposedValues& to, float delta) -> DecomposedValues {
auto product = clamp(from.rotation.dot(to.rotation), -1.0f, 1.0f);
FloatVector4 interpolated_rotation;
if (fabsf(product) == 1.0f) {
interpolated_rotation = from.rotation;
} else {
auto theta = acos(product);
auto w = sin(delta * theta) / sqrtf(1.0f - product * product);
for (int i = 0; i < 4; i++) {
from.rotation[i] *= cos(delta * theta) - product * w;
to.rotation[i] *= w;
interpolated_rotation[i] = from.rotation[i] + to.rotation[i];
}
}
auto interpolated_rotation = slerp(from.rotation, to.rotation, delta);
return {
interpolate_raw(from.translation, to.translation, delta),
interpolate_raw(from.scale, to.scale, delta),