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LibWeb: Add class to represent "list of available images" from HTML spec

This commit is contained in:
Andreas Kling 2023-05-11 06:12:45 +02:00
parent 596eabe9e6
commit 9281bf7a01
6 changed files with 158 additions and 0 deletions

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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/HTML/DecodedImageData.h>
#include <LibWeb/HTML/ListOfAvailableImages.h>
namespace Web::HTML {
ListOfAvailableImages::ListOfAvailableImages() = default;
ListOfAvailableImages::~ListOfAvailableImages() = default;
bool ListOfAvailableImages::Key::operator==(Key const& other) const
{
return url == other.url && mode == other.mode && origin == other.origin;
}
u32 ListOfAvailableImages::Key::hash() const
{
if (!cached_hash.has_value()) {
u32 url_hash = Traits<AK::URL>::hash(url);
u32 mode_hash = static_cast<u32>(mode);
u32 origin_hash = 0;
if (origin.has_value())
origin_hash = Traits<HTML::Origin>::hash(origin.value());
cached_hash = pair_int_hash(url_hash, pair_int_hash(mode_hash, origin_hash));
}
return cached_hash.value();
}
ErrorOr<NonnullRefPtr<ListOfAvailableImages::Entry>> ListOfAvailableImages::Entry::create(NonnullRefPtr<DecodedImageData> image_data, bool ignore_higher_layer_caching)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) Entry(move(image_data), ignore_higher_layer_caching));
}
ListOfAvailableImages::Entry::Entry(NonnullRefPtr<DecodedImageData> data, bool ignore_higher_layer_caching)
: ignore_higher_layer_caching(ignore_higher_layer_caching)
, image_data(move(data))
{
}
ListOfAvailableImages::Entry::~Entry() = default;
ErrorOr<void> ListOfAvailableImages::add(Key const& key, NonnullRefPtr<DecodedImageData> image_data, bool ignore_higher_layer_caching)
{
auto entry = TRY(Entry::create(move(image_data), ignore_higher_layer_caching));
TRY(m_images.try_set(key, move(entry)));
return {};
}
void ListOfAvailableImages::remove(Key const& key)
{
m_images.remove(key);
}
RefPtr<ListOfAvailableImages::Entry> ListOfAvailableImages::get(Key const& key) const
{
auto it = m_images.find(key);
if (it == m_images.end())
return nullptr;
return it->value;
}
}

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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/URL.h>
#include <LibJS/Heap/Cell.h>
#include <LibWeb/Forward.h>
#include <LibWeb/HTML/CORSSettingAttribute.h>
#include <LibWeb/HTML/Origin.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/images.html#list-of-available-images
class ListOfAvailableImages {
public:
struct Key {
AK::URL url;
HTML::CORSSettingAttribute mode;
Optional<HTML::Origin> origin;
[[nodiscard]] bool operator==(Key const& other) const;
[[nodiscard]] u32 hash() const;
private:
mutable Optional<u32> cached_hash;
};
struct Entry final : public RefCounted<Entry> {
static ErrorOr<NonnullRefPtr<Entry>> create(NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
~Entry();
bool ignore_higher_layer_caching { false };
NonnullRefPtr<DecodedImageData> image_data;
private:
Entry(NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
};
ListOfAvailableImages();
~ListOfAvailableImages();
ErrorOr<void> add(Key const&, NonnullRefPtr<DecodedImageData>, bool ignore_higher_layer_caching);
void remove(Key const&);
[[nodiscard]] RefPtr<Entry> get(Key const&) const;
private:
HashMap<Key, NonnullRefPtr<Entry>> m_images;
};
}
namespace AK {
template<>
struct Traits<Web::HTML::ListOfAvailableImages::Key> : public GenericTraits<Web::HTML::ListOfAvailableImages::Key> {
static unsigned hash(Web::HTML::ListOfAvailableImages::Key const& key)
{
return key.hash();
}
static bool equals(Web::HTML::ListOfAvailableImages::Key const& a, Web::HTML::ListOfAvailableImages::Key const& b)
{
return a == b;
}
};
}