1 files changed, 69 insertions, 0 deletions
diff --git a/Source/WebCore/dom/DOMRectReadOnly.h b/Source/WebCore/dom/DOMRectReadOnly.h
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+++ b/Source/WebCore/dom/DOMRectReadOnly.h
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+/*
+ * Copyright (C) 2016 Apple Inc. 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#pragma once
+
+#include "DOMRectInit.h"
+#include "ScriptWrappable.h"
+#include <wtf/MathExtras.h>
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class DOMRectReadOnly : public ScriptWrappable, public RefCounted<DOMRectReadOnly> {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static Ref<DOMRectReadOnly> create(double x, double y, double width, double height) { return adoptRef(*new DOMRectReadOnly(x, y, width, height)); }
+    static Ref<DOMRectReadOnly> fromRect(const DOMRectInit& init) { return create(init.x, init.y, init.width, init.height); }
+
+    double x() const { return m_x; }
+    double y() const { return m_y; }
+    double width() const { return m_width; }
+    double height() const { return m_height; }
+
+    // Model NaN handling after Math.min, Math.max.
+    double top() const { return WTF::nanPropagatingMin(m_y, m_y + m_height); }
+    double right() const { return WTF::nanPropagatingMax(m_x, m_x + m_width); }
+    double bottom() const { return WTF::nanPropagatingMax(m_y, m_y + m_height); }
+    double left() const { return WTF::nanPropagatingMin(m_x, m_x + m_width); }
+
+protected:
+    DOMRectReadOnly(double x, double y, double width, double height)
+        : m_x(x)
+        , m_y(y)
+        , m_width(width)
+        , m_height(height)
+    {
+    }
+
+    // Any of these can be NaN or Inf.
+    double m_x;
+    double m_y;
+    double m_width; // Can be negative.
+    double m_height; // Can be negative.
+}; 
+
+}