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LibWeb: Discard inaccuracies when interpolating rotate

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Callum Law 2025-08-12 23:35:43 +12:00 • committed by Tim Ledbetter
commit ed6cac89b9
Notes: github-actions[bot] 2025-08-12 13:36:13 +00:00
1 changed files with 8 additions and 1 deletions
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9
Libraries/LibWeb/CSS/Interpolation.cpp
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@ -360,8 +360,15 @@ static FloatVector4 slerp(FloatVector4 const& from, FloatVector4 const& to, floa
auto theta = acosf(product); auto theta = acosf(product);
auto w = sinf(delta * theta) / sqrtf(1 - (product * product)); auto w = sinf(delta * theta) / sqrtf(1 - (product * product));
auto from_multiplier = cosf(delta * theta) - (product * w);
return from * (cosf(delta * theta) - (product * w)) + to * w; if (abs(w) < AK::NumericLimits<float>::epsilon())
return from * from_multiplier;
if (abs(from_multiplier) < AK::NumericLimits<float>::epsilon())
return to * w;
return from * from_multiplier + to * w;
} }
static RefPtr<StyleValue const> interpolate_rotate(DOM::Element& element, CalculationContext calculation_context, StyleValue const& a_from, StyleValue const& a_to, float delta, AllowDiscrete allow_discrete) static RefPtr<StyleValue const> interpolate_rotate(DOM::Element& element, CalculationContext calculation_context, StyleValue const& a_from, StyleValue const& a_to, float delta, AllowDiscrete allow_discrete)