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LibWeb: Add a class to represent the "source set" concept from HTML

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Also comes with a little extra CSS parser helper for parsing "sizes"
attributes in images.
This commit is contained in:
Andreas Kling 2023-05-11 16:56:01 +02:00
parent 9281bf7a01
commit 6fe4fcb74b
5 changed files with 500 additions and 0 deletions
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55
Userland/Libraries/LibWeb/HTML/SourceSet.h Normal file
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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/URL.h>
#include <AK/Variant.h>
#include <LibWeb/CSS/Length.h>
namespace Web::HTML {
// https://html.spec.whatwg.org/multipage/images.html#image-source
struct ImageSource {
struct PixelDensityDescriptorValue {
float value { 0 };
};
struct WidthDescriptorValue {
CSSPixels value { 0 };
};
String url;
Variant<Empty, PixelDensityDescriptorValue, WidthDescriptorValue> descriptor;
};
struct ImageSourceAndPixelDensity {
ImageSource source;
float pixel_density { 1.0f };
};
// https://html.spec.whatwg.org/multipage/images.html#source-set
struct SourceSet {
static SourceSet create(DOM::Document const&, String default_source, String srcset, String sizes);
[[nodiscard]] bool is_empty() const;
// https://html.spec.whatwg.org/multipage/images.html#select-an-image-source-from-a-source-set
[[nodiscard]] ImageSourceAndPixelDensity select_an_image_source();
// https://html.spec.whatwg.org/multipage/images.html#normalise-the-source-densities
void normalize_source_densities();
SourceSet();
Vector<ImageSource> m_sources;
CSS::Length m_source_size;
};
SourceSet parse_a_srcset_attribute(StringView);
CSS::Length parse_a_sizes_attribute(DOM::Document const&, StringView);
}