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LibWeb: Maintain easing keywords as KeywordStyleValue until use-time

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This excludes `step-end` and `step-start` which are expected to be
converted to the equivalent function at parse time.

We are expected to serialize these as the explicit keywords - previously
we would parse as `EasingStyleValue` and serialize equivalent functions
as the keywords. This caused issues as we would incorrectly serialize
even explicit functions as the keyword.

This also allows us to move the magic easing functions to
`EasingFunction` rather than `EasingStyleValue` which is a bit tidier
This commit is contained in:
Callum Law
2025-10-11 23:34:35 +13:00
committed by Sam Atkins
parent 755a576013
commit 03be70087d
Notes: github-actions[bot] 2025-10-20 10:29:02 +00:00 
Author: https://github.com/Calme1709
Commit: https://github.com/LadybirdBrowser/ladybird/commit/03be70087d4
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6459
Reviewed-by: https://github.com/AtkinsSJ ✅
15 changed files with 210 additions and 125 deletions
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7
Libraries/LibWeb/CSS/EasingFunction.h
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@@ -51,6 +51,13 @@ struct StepsEasingFunction {
struct EasingFunction : public Variant<LinearEasingFunction, CubicBezierEasingFunction, StepsEasingFunction> {
using Variant::Variant;
static EasingFunction linear();
static EasingFunction ease_in();
static EasingFunction ease_out();
static EasingFunction ease_in_out();
static EasingFunction ease();
static EasingFunction from_style_value(StyleValue const&);
double evaluate_at(double input_progress, bool before_flag) const;