Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/HTML/SourceSet.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Variant.h>
+#include <LibURL/URL.h>
+#include <LibWeb/CSS/CalculatedOr.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/images.html#image-source
+struct ImageSource {
+    struct PixelDensityDescriptorValue {
+        double value { 0 };
+    };
+
+    struct WidthDescriptorValue {
+        CSSPixels value { 0 };
+    };
+
+    String url;
+    Variant<Empty, PixelDensityDescriptorValue, WidthDescriptorValue> descriptor;
+};
+
+struct ImageSourceAndPixelDensity {
+    ImageSource source;
+    double pixel_density { 1.0f };
+};
+
+// https://html.spec.whatwg.org/multipage/images.html#source-set
+struct SourceSet {
+    static SourceSet create(DOM::Element const& element, String const& default_source, String const& srcset, String const& sizes, HTML::HTMLImageElement const* img = nullptr);
+
+    [[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(DOM::Element const&);
+
+    SourceSet();
+
+    Vector<ImageSource> m_sources;
+    CSS::LengthOrCalculated m_source_size;
+};
+
+SourceSet parse_a_srcset_attribute(StringView);
+[[nodiscard]] CSS::LengthOrCalculated parse_a_sizes_attribute(DOM::Element const& element, StringView sizes, HTML::HTMLImageElement const* img = nullptr);
+
+}