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LibWeb: Support calc within linear() easing function

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Callum Law 2025-10-09 23:40:46 +13:00 • committed by Sam Atkins
commit 2f83356c0f
Notes: github-actions[bot] 2025-10-20 10:29:34 +00:00
6 changed files with 94 additions and 34 deletions
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35
Libraries/LibWeb/CSS/EasingFunction.cpp
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@ -7,6 +7,8 @@
#include "EasingFunction.h"
#include <AK/BinarySearch.h>
#include <LibWeb/CSS/StyleValues/EasingStyleValue.h>
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
namespace Web::CSS {
@ -267,13 +269,40 @@ static Vector<LinearEasingFunction::ControlPoint> canonicalize_linear_easing_fun
EasingFunction EasingFunction::from_style_value(StyleValue const& style_value)
{
auto const resolve_number = [](StyleValue const& style_value) {
if (style_value.is_number())
return style_value.as_number().number();
if (style_value.is_calculated())
return style_value.as_calculated().resolve_number({}).value();
VERIFY_NOT_REACHED();
};
auto const resolve_percentage = [](StyleValue const& style_value) {
if (style_value.is_percentage())
return style_value.as_percentage().percentage().as_fraction();
if (style_value.is_calculated())
return style_value.as_calculated().resolve_percentage({})->as_fraction();
VERIFY_NOT_REACHED();
};
if (style_value.is_easing()) {
return style_value.as_easing().function().visit(
[](EasingStyleValue::Linear const& linear) -> EasingFunction {
[&](EasingStyleValue::Linear const& linear) -> EasingFunction {
Vector<LinearEasingFunction::ControlPoint> resolved_control_points;
for (auto const& control_point : linear.stops)
resolved_control_points.append({ control_point.input, control_point.output });
for (auto const& control_point : linear.stops) {
double output = resolve_number(control_point.output);
Optional<double> input;
if (control_point.input)
input = resolve_percentage(*control_point.input);
resolved_control_points.append({ input, output });
}
// https://drafts.csswg.org/css-easing-2/#funcdef-linear
// If an argument lacks a <percentage>, its input progress value is initially empty. This is corrected