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LibWeb: Add class to represent "list of available images" from HTML spec
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66
Userland/Libraries/LibWeb/HTML/ListOfAvailableImages.cpp
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66
Userland/Libraries/LibWeb/HTML/ListOfAvailableImages.cpp
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/*
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* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/HTML/DecodedImageData.h>
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#include <LibWeb/HTML/ListOfAvailableImages.h>
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namespace Web::HTML {
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ListOfAvailableImages::ListOfAvailableImages() = default;
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ListOfAvailableImages::~ListOfAvailableImages() = default;
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bool ListOfAvailableImages::Key::operator==(Key const& other) const
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{
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return url == other.url && mode == other.mode && origin == other.origin;
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}
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u32 ListOfAvailableImages::Key::hash() const
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{
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if (!cached_hash.has_value()) {
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u32 url_hash = Traits<AK::URL>::hash(url);
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u32 mode_hash = static_cast<u32>(mode);
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u32 origin_hash = 0;
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if (origin.has_value())
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origin_hash = Traits<HTML::Origin>::hash(origin.value());
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cached_hash = pair_int_hash(url_hash, pair_int_hash(mode_hash, origin_hash));
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}
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return cached_hash.value();
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}
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ErrorOr<NonnullRefPtr<ListOfAvailableImages::Entry>> ListOfAvailableImages::Entry::create(NonnullRefPtr<DecodedImageData> image_data, bool ignore_higher_layer_caching)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) Entry(move(image_data), ignore_higher_layer_caching));
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}
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ListOfAvailableImages::Entry::Entry(NonnullRefPtr<DecodedImageData> data, bool ignore_higher_layer_caching)
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: ignore_higher_layer_caching(ignore_higher_layer_caching)
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, image_data(move(data))
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{
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}
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ListOfAvailableImages::Entry::~Entry() = default;
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ErrorOr<void> ListOfAvailableImages::add(Key const& key, NonnullRefPtr<DecodedImageData> image_data, bool ignore_higher_layer_caching)
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{
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auto entry = TRY(Entry::create(move(image_data), ignore_higher_layer_caching));
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TRY(m_images.try_set(key, move(entry)));
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return {};
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}
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void ListOfAvailableImages::remove(Key const& key)
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{
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m_images.remove(key);
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}
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RefPtr<ListOfAvailableImages::Entry> ListOfAvailableImages::get(Key const& key) const
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{
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auto it = m_images.find(key);
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if (it == m_images.end())
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return nullptr;
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return it->value;
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}
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}
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71
Userland/Libraries/LibWeb/HTML/ListOfAvailableImages.h
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Userland/Libraries/LibWeb/HTML/ListOfAvailableImages.h
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/*
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* Copyright (c) 2023, Andreas Kling <kling@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/HashMap.h>
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#include <AK/URL.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/HTML/CORSSettingAttribute.h>
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#include <LibWeb/HTML/Origin.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/images.html#list-of-available-images
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class ListOfAvailableImages {
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public:
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struct Key {
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AK::URL url;
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HTML::CORSSettingAttribute mode;
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Optional<HTML::Origin> origin;
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[[nodiscard]] bool operator==(Key const& other) const;
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[[nodiscard]] u32 hash() const;
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private:
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mutable Optional<u32> cached_hash;
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};
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struct Entry final : public RefCounted<Entry> {
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static ErrorOr<NonnullRefPtr<Entry>> create(NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
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~Entry();
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bool ignore_higher_layer_caching { false };
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NonnullRefPtr<DecodedImageData> image_data;
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private:
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Entry(NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
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};
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ListOfAvailableImages();
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~ListOfAvailableImages();
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ErrorOr<void> add(Key const&, NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
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void remove(Key const&);
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[[nodiscard]] RefPtr<Entry> get(Key const&) const;
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private:
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HashMap<Key, NonnullRefPtr<Entry>> m_images;
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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::HTML::ListOfAvailableImages::Key> : public GenericTraits<Web::HTML::ListOfAvailableImages::Key> {
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static unsigned hash(Web::HTML::ListOfAvailableImages::Key const& key)
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{
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return key.hash();
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}
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static bool equals(Web::HTML::ListOfAvailableImages::Key const& a, Web::HTML::ListOfAvailableImages::Key const& b)
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{
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return a == b;
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}
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};
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}
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