1 files changed, 64 insertions, 0 deletions
diff --git a/Libraries/LibWeb/CSS/Length.cpp b/Libraries/LibWeb/CSS/Length.cpp
new file mode 100644
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+++ b/Libraries/LibWeb/CSS/Length.cpp
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+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibWeb/CSS/Length.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/DOM/HTMLHtmlElement.h>
+
+namespace Web {
+
+float Length::to_px(const LayoutNode& layout_node) const
+{
+    switch (m_type) {
+    case Type::Auto:
+        return 0;
+    case Type::Px:
+        return m_value;
+    case Type::Em:
+        return m_value * layout_node.font_size();
+    case Type::Rem:
+        return m_value * layout_node.document().document_element()->layout_node()->font_size();
+    default:
+        ASSERT_NOT_REACHED();
+    }
+}
+
+const char* Length::unit_name() const
+{
+    switch (m_type) {
+    case Type::Px:
+        return "px";
+    case Type::Em:
+        return "em";
+    case Type::Rem:
+        return "rem";
+    case Type::Auto:
+        return "auto";
+    }
+    ASSERT_NOT_REACHED();
+}
+
+}