1 files changed, 55 insertions, 0 deletions
diff --git a/Userland/Libraries/LibWeb/HTML/SourceSet.h b/Userland/Libraries/LibWeb/HTML/SourceSet.h
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+++ b/Userland/Libraries/LibWeb/HTML/SourceSet.h
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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);
+
+}