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https://github.com/LadybirdBrowser/ladybird.git
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66bd75f2b9
This is mostly a copy-paste of the algorithms already in StyleComputer with spec links and comments. The only thing that really changed is the handling of values outside of the range [0, 1] in the cubic bezier function. The implementation in StyleComputer will be removed in a later commit.
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/*
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* Copyright (c) 2023, Ali Mohammad Pur <mpfard@serenityos.org>
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* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/Vector.h>
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namespace Web::Animations {
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// https://www.w3.org/TR/css-easing-1/#the-linear-easing-function
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struct LinearTimingFunction {
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double operator()(double t, bool) const;
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};
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// https://www.w3.org/TR/css-easing-1/#cubic-bezier-easing-functions
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struct CubicBezierTimingFunction {
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double x1;
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double y1;
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double x2;
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double y2;
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struct CachedSample {
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double x;
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double y;
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double t;
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};
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mutable Vector<CachedSample, 64> m_cached_x_samples = {};
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double operator()(double input_progress, bool) const;
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};
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// https://www.w3.org/TR/css-easing-1/#step-easing-functions
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struct StepsTimingFunction {
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size_t number_of_steps;
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bool jump_at_start;
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bool jump_at_end;
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double operator()(double input_progress, bool before_flag) const;
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};
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struct TimingFunction {
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Variant<LinearTimingFunction, CubicBezierTimingFunction, StepsTimingFunction> function;
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double operator()(double input_progress, bool before_flag) const;
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};
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static TimingFunction linear_timing_function { LinearTimingFunction {} };
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// NOTE: Magic values from <https://www.w3.org/TR/css-easing-1/#valdef-cubic-bezier-easing-function-ease>
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static TimingFunction ease_timing_function { CubicBezierTimingFunction { 0.25, 0.1, 0.25, 1.0 } };
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static TimingFunction ease_in_timing_function { CubicBezierTimingFunction { 0.42, 0.0, 1.0, 1.0 } };
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static TimingFunction ease_out_timing_function { CubicBezierTimingFunction { 0.0, 0.0, 0.58, 1.0 } };
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static TimingFunction ease_in_out_timing_function { CubicBezierTimingFunction { 0.42, 0.0, 0.58, 1.0 } };
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}
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