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12e8f503aa
This works by generating random values using XorShift128PlusRNG at compute time and then caching them on the document using the relevant random-caching-key
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* Copyright (c) 2025, Callum Law <callumlaw1709@outlook.com>
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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 <LibWeb/CSS/Enums.h>
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#include <LibWeb/CSS/StyleValues/StyleValue.h>
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namespace Web::CSS {
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struct RandomCachingKey {
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FlyString name;
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Optional<Web::UniqueNodeID> element_id;
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};
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class RandomValueSharingStyleValue : public StyleValueWithDefaultOperators<RandomValueSharingStyleValue> {
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public:
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static ValueComparingNonnullRefPtr<RandomValueSharingStyleValue const> create_fixed(NonnullRefPtr<StyleValue const> const& fixed_value)
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{
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return adopt_ref(*new (nothrow) RandomValueSharingStyleValue(fixed_value, false, {}, false));
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}
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static ValueComparingNonnullRefPtr<RandomValueSharingStyleValue const> create_auto(FlyString name, bool element_shared)
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{
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return adopt_ref(*new (nothrow) RandomValueSharingStyleValue({}, true, move(name), element_shared));
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}
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static ValueComparingNonnullRefPtr<RandomValueSharingStyleValue const> create_dashed_ident(FlyString name, bool element_shared)
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{
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return adopt_ref(*new (nothrow) RandomValueSharingStyleValue({}, false, move(name), element_shared));
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}
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virtual ~RandomValueSharingStyleValue() override = default;
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virtual ValueComparingNonnullRefPtr<StyleValue const> absolutized(ComputationContext const&) const override;
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double random_base_value() const;
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virtual String to_string(SerializationMode serialization_mode) const override;
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bool properties_equal(RandomValueSharingStyleValue const& other) const
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{
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return m_fixed_value == other.m_fixed_value
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&& m_is_auto == other.m_is_auto
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&& m_name == other.m_name
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&& m_element_shared == other.m_element_shared;
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}
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private:
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explicit RandomValueSharingStyleValue(RefPtr<StyleValue const> fixed_value, bool is_auto, Optional<FlyString> name, bool element_shared)
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: StyleValueWithDefaultOperators(Type::RandomValueSharing)
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, m_fixed_value(move(fixed_value))
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, m_is_auto(is_auto)
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, m_name(move(name))
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, m_element_shared(element_shared)
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{
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}
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ValueComparingRefPtr<StyleValue const> m_fixed_value;
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bool m_is_auto;
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Optional<FlyString> m_name;
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bool m_element_shared;
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};
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}
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namespace AK {
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template<>
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struct Traits<Web::CSS::RandomCachingKey> : public DefaultTraits<Web::CSS::RandomCachingKey> {
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static unsigned hash(Web::CSS::RandomCachingKey const& key)
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{
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if (!key.element_id.has_value())
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return key.name.hash();
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return pair_int_hash(key.name.hash(), Traits<i64>::hash(key.element_id->value()));
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}
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static bool equals(Web::CSS::RandomCachingKey const& a, Web::CSS::RandomCachingKey const& b)
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{
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return a.element_id == b.element_id && a.name == b.name;
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}
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};
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}
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