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diff --git a/Tools/TestWebKitAPI/Tests/WebCore/IntSize.cpp b/Tools/TestWebKitAPI/Tests/WebCore/IntSize.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WebCore/IntSize.cpp
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+/*
+ * Copyright (C) 2014-2016 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.
+ */
+
+#include "config.h"
+
+#include <WebCore/FloatSize.h>
+#include <WebCore/IntSize.h>
+
+#if USE(CG)
+#include <CoreGraphics/CoreGraphics.h>
+#endif
+
+#if PLATFORM(WIN)
+#include <d2d1.h>
+#endif
+
+namespace TestWebKitAPI {
+
+static void testGetAndSet(WebCore::IntSize rect)
+{
+    rect.setWidth(203);
+    EXPECT_EQ(203, rect.width());
+    rect.setHeight(73);
+    EXPECT_EQ(73, rect.height());
+}
+
+static void testEmptySize(const WebCore::IntSize& rect)
+{
+    EXPECT_EQ(0, rect.width());
+    EXPECT_EQ(0, rect.height());
+    EXPECT_TRUE(rect.isEmpty());
+    EXPECT_TRUE(rect.isZero());
+}
+
+TEST(IntSize, DefaultConstruction)
+{
+    WebCore::IntSize test;
+
+    testEmptySize(test);
+
+    testGetAndSet(test);
+}
+
+TEST(IntSize, ValueConstruction)
+{
+    WebCore::IntSize test(100, 200);
+
+    EXPECT_EQ(100, test.width());
+    EXPECT_EQ(200, test.height());
+    EXPECT_FALSE(test.isEmpty());
+    EXPECT_FALSE(test.isZero());
+
+    static const float epsilon = 0.0001f;
+    EXPECT_NEAR(0.5f, test.aspectRatio(), epsilon);
+}
+
+TEST(IntSize, FloatSizeConstruction)
+{
+    WebCore::FloatSize size(1024.2, 767.8);
+    WebCore::IntSize test(size);
+
+    EXPECT_EQ(1024, test.width());
+    EXPECT_EQ(767, test.height());
+
+    ASSERT_FALSE(test.isEmpty());
+    ASSERT_FALSE(test.isZero());
+
+    static const double epsilon = 0.001;
+    EXPECT_NEAR(1.335f, test.aspectRatio(), epsilon);
+
+    testGetAndSet(test);
+}
+
+TEST(IntSize, DiagonalLengthAndArea)
+{
+    WebCore::IntSize test(1024, 768);
+
+    EXPECT_EQ(1638400, test.diagonalLengthSquared());
+    EXPECT_EQ(786432U, test.area().unsafeGet());
+}
+
+TEST(IntSize, Scale)
+{
+    WebCore::IntSize test(1024, 768);
+
+    test.scale(2.0f);
+
+    EXPECT_EQ(2048, test.width());
+    EXPECT_EQ(1536, test.height());
+
+    test.scale(0.5f);
+
+    EXPECT_EQ(1024, test.width());
+    EXPECT_EQ(768, test.height());
+
+    test.scale(2.0f, 0.5f);
+
+    EXPECT_EQ(2048, test.width());
+    EXPECT_EQ(384, test.height());
+}
+
+TEST(IntSize, Expand)
+{
+    WebCore::IntSize test(1024, 768);
+
+    EXPECT_EQ(1024, test.width());
+    EXPECT_EQ(768, test.height());
+
+    test.expand(100, 50);
+
+    EXPECT_EQ(1124, test.width());
+    EXPECT_EQ(818, test.height());
+
+    WebCore::IntSize other(2048, 700);
+
+    auto expanded = test.expandedTo(other);
+
+    EXPECT_EQ(2048, expanded.width());
+    EXPECT_EQ(818, expanded.height());
+}
+
+TEST(IntSize, Shrink)
+{
+    WebCore::IntSize test(1024, 768);
+    WebCore::IntSize other(1000, 700);
+
+    auto shrunken = test.shrunkTo(other);
+
+    EXPECT_EQ(1000, shrunken.width());
+    EXPECT_EQ(700, shrunken.height());
+
+    WebCore::IntSize other2(2000.0f, 700.0f);
+
+    auto shrunken2 = test.shrunkTo(other2);
+
+    EXPECT_EQ(1024, shrunken2.width());
+    EXPECT_EQ(700, shrunken2.height());
+}
+
+TEST(IntSize, TransposedSize)
+{
+    WebCore::IntSize test(1024, 768);
+
+    auto transposedSize = test.transposedSize();
+
+    EXPECT_EQ(768, transposedSize.width());
+    EXPECT_EQ(1024, transposedSize.height());
+}
+
+TEST(IntSize, Casting)
+{
+    WebCore::IntSize test(1024, 768);
+
+#if USE(CG)
+    CGSize cgSize = test;
+
+    EXPECT_FLOAT_EQ(1024.0f, cgSize.width);
+    EXPECT_FLOAT_EQ(768.0f, cgSize.height);
+
+    CGSize cgSize2 = CGSizeMake(-22.3f, 14.6f);
+
+    WebCore::IntSize testCG(cgSize2);
+
+    EXPECT_EQ(-22, testCG.width());
+    EXPECT_EQ(14, testCG.height());
+#endif
+
+#if PLATFORM(WIN)
+    D2D1_SIZE_U d2dSizeU = test;
+    EXPECT_EQ(1024, d2dSizeU.width);
+    EXPECT_EQ(768, d2dSizeU.height);
+
+    D2D1_SIZE_F d2dSizeF = test;
+    EXPECT_FLOAT_EQ(1024.0f, d2dSizeF.width);
+    EXPECT_FLOAT_EQ(768.0f, d2dSizeF.height);
+
+    D2D1_SIZE_F d2dSizeF2 = D2D1::SizeF(-22.3f, 14.6f);
+
+    WebCore::IntSize testD2D(d2dSizeF2);
+
+    EXPECT_EQ(-22, testD2D.width());
+    EXPECT_EQ(14, testD2D.height());
+
+    D2D1_SIZE_F d2dSizeU2 = D2D1::SizeF(-23, 16);
+
+    WebCore::IntSize testD2D2(d2dSizeU2);
+
+    EXPECT_EQ(-23, testD2D2.width());
+    EXPECT_EQ(16, testD2D2.height());
+#endif
+}
+
+TEST(IntSize, AddSubtract)
+{
+    WebCore::IntSize a(512, 384);
+    WebCore::IntSize b(100, 100);
+
+    WebCore::IntSize c = a + b;
+
+    EXPECT_EQ(612, c.width());
+    EXPECT_EQ(484, c.height());
+
+    a += b;
+
+    EXPECT_EQ(612, a.width());
+    EXPECT_EQ(484, a.height());
+
+    WebCore::IntSize a2(512, 384);
+
+    WebCore::IntSize d = a2 - b;
+
+    EXPECT_EQ(412, d.width());
+    EXPECT_EQ(284, d.height());
+
+    a2 -= b;
+
+    EXPECT_EQ(412, a2.width());
+    EXPECT_EQ(284, a2.height());
+}
+
+TEST(IntSize, Negation)
+{
+    WebCore::IntSize a(512, 384);
+
+    WebCore::IntSize negated = -a;
+
+    EXPECT_EQ(-512, negated.width());
+    EXPECT_EQ(-384, negated.height());
+}
+
+TEST(IntSize, Equality)
+{
+    WebCore::IntSize a(1024, 768);
+    WebCore::IntSize b(1024, 768);
+    WebCore::IntSize c(768, 534);
+
+    ASSERT_TRUE(a == b);
+    ASSERT_FALSE(a != b);
+    ASSERT_FALSE(a == c);
+    ASSERT_TRUE(a != c);
+}
+
+TEST(IntSize, Contract)
+{
+    WebCore::IntSize a(1024, 768);
+
+    a.contract(100, 50);
+
+    EXPECT_EQ(924, a.width());
+    EXPECT_EQ(718, a.height());
+}
+
+TEST(IntSize, Clamp)
+{
+    WebCore::IntSize a(1024, 768);
+
+    a.clampNegativeToZero();
+
+    EXPECT_EQ(1024, a.width());
+    EXPECT_EQ(768, a.height());
+
+    WebCore::IntSize b(-1024, -768);
+
+    b.clampNegativeToZero();
+
+    EXPECT_EQ(0, b.width());
+    EXPECT_EQ(0, b.height());
+
+    WebCore::IntSize minimumSize(1024, 1000);
+
+    a.clampToMinimumSize(minimumSize);
+
+    EXPECT_EQ(1024, a.width());
+    EXPECT_EQ(1000, a.height());
+}
+
+TEST(IntSize, ConstrainedBetween)
+{
+    WebCore::IntSize minimumSize(384, 256);
+    WebCore::IntSize maximumSize(2048, 1536);
+
+    WebCore::IntSize a(1024, 768);
+
+    auto constrained1 = a.constrainedBetween(minimumSize, maximumSize);
+
+    EXPECT_EQ(1024, constrained1.width());
+    EXPECT_EQ(768, constrained1.height());
+
+    WebCore::IntSize b(200, 100);
+
+    auto constrained2 = b.constrainedBetween(minimumSize, maximumSize);
+
+    EXPECT_EQ(384, constrained2.width());
+    EXPECT_EQ(256, constrained2.height());
+
+    WebCore::IntSize c(5000, 2000);
+
+    auto constrained3 = c.constrainedBetween(minimumSize, maximumSize);
+
+    EXPECT_EQ(2048, constrained3.width());
+    EXPECT_EQ(1536, constrained3.height());
+}
+
+/*
+
+IntSize constrainedBetween(const IntSize& min, const IntSize& max) const;
+
+*/
+
+}