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LibWeb: Add interpolation for ratio values

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Matthew Olsson 2024-03-02 20:09:33 -07:00 • committed by Alexander Kalenik
parent f02cd4d0b0
commit 4d9f2bf5f1
1 changed files with 15 additions and 0 deletions
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15
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -52,6 +52,7 @@
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
#include <LibWeb/CSS/StyleValues/PositionStyleValue.h>
#include <LibWeb/CSS/StyleValues/RatioStyleValue.h>
#include <LibWeb/CSS/StyleValues/RectStyleValue.h>
#include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/StringStyleValue.h>
@ -1104,6 +1105,20 @@ static ErrorOr<NonnullRefPtr<StyleValue const>> interpolate_value(DOM::Element&
TRY(interpolate_value(element, from_position.edge_x(), to_position.edge_x(), delta))->as_edge(),
TRY(interpolate_value(element, from_position.edge_y(), to_position.edge_y(), delta))->as_edge());
}
case StyleValue::Type::Ratio: {
auto from_ratio = from.as_ratio().ratio();
auto to_ratio = to.as_ratio().ratio();
// The interpolation of a <ratio> is defined by converting each <ratio> to a number by dividing the first value
// by the second (so a ratio of 3 / 2 would become 1.5), taking the logarithm of that result (so the 1.5 would
// become approximately 0.176), then interpolating those values. The result during the interpolation is
// converted back to a <ratio> by inverting the logarithm, then interpreting the result as a <ratio> with the
// result as the first value and 1 as the second value.
auto from_number = log(from_ratio.value());
auto to_number = log(to_ratio.value());
auto interp_number = interpolate_raw(from_number, to_number, delta);
return RatioStyleValue::create(Ratio(pow(M_E, interp_number)));
}
case StyleValue::Type::Rect: {
auto from_rect = from.as_rect().rect();
auto to_rect = to.as_rect().rect();