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diff --git a/WebCore/platform/graphics/AffineTransform.cpp b/WebCore/platform/graphics/AffineTransform.cpp
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+++ b/WebCore/platform/graphics/AffineTransform.cpp
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+/*
+ * Copyright (C) 2005, 2006 Apple Computer, 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "config.h"
+#include "AffineTransform.h"
+
+#include "FloatRect.h"
+#include "IntRect.h"
+
+#include <wtf/MathExtras.h>
+
+namespace WebCore {
+
+static void affineTransformDecompose(const AffineTransform& matrix, double sr[9])
+{
+    AffineTransform m(matrix);
+
+    // Compute scaling factors
+    double sx = sqrt(m.a() * m.a() + m.b() * m.b());
+    double sy = sqrt(m.c() * m.c() + m.d() * m.d());
+
+    /* Compute cross product of transformed unit vectors. If negative,
+        one axis was flipped. */
+
+    if (m.a() * m.d() - m.c() * m.b() < 0.0) {
+        // Flip axis with minimum unit vector dot product
+
+        if (m.a() < m.d())
+            sx = -sx;
+        else
+            sy = -sy;
+    }
+
+    // Remove scale from matrix
+
+    m.scale(1.0 / sx, 1.0 / sy);
+
+    // Compute rotation
+
+    double angle = atan2(m.b(), m.a());
+
+    // Remove rotation from matrix
+
+    m.rotate(rad2deg(-angle));
+
+    // Return results
+
+    sr[0] = sx; sr[1] = sy; sr[2] = angle;
+    sr[3] = m.a(); sr[4] = m.b();
+    sr[5] = m.c(); sr[6] = m.d();
+    sr[7] = m.e(); sr[8] = m.f();
+}
+
+static void affineTransformCompose(AffineTransform& m, const double sr[9])
+{
+    m.setA(sr[3]);
+    m.setB(sr[4]);
+    m.setC(sr[5]);
+    m.setD(sr[6]);
+    m.setE(sr[7]);
+    m.setF(sr[8]);
+    m.rotate(rad2deg(sr[2]));
+    m.scale(sr[0], sr[1]);
+}
+
+bool AffineTransform::isInvertible() const
+{
+    return det() != 0.0;
+}
+
+AffineTransform& AffineTransform::multiply(const AffineTransform& other)
+{
+    return (*this) *= other;
+}
+
+AffineTransform& AffineTransform::scale(double s)
+{
+    return scale(s, s);
+}
+
+AffineTransform& AffineTransform::scaleNonUniform(double sx, double sy)
+{
+    return scale(sx, sy);
+}
+
+AffineTransform& AffineTransform::rotateFromVector(double x, double y)
+{
+    return rotate(rad2deg(atan2(y, x)));
+}
+
+AffineTransform& AffineTransform::flipX()
+{
+    return scale(-1.0f, 1.0f);
+}
+
+AffineTransform& AffineTransform::flipY()
+{
+    return scale(1.0f, -1.0f);
+}
+
+AffineTransform& AffineTransform::skew(double angleX, double angleY)
+{
+    return shear(tan(deg2rad(angleX)), tan(deg2rad(angleY)));
+}
+
+AffineTransform& AffineTransform::skewX(double angle)
+{
+    return shear(tan(deg2rad(angle)), 0.0f);
+}
+
+AffineTransform& AffineTransform::skewY(double angle)
+{
+    return shear(0.0f, tan(deg2rad(angle)));
+}
+
+AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest)
+{
+    AffineTransform transform;
+    transform.translate(dest.x() - source.x(), dest.y() - source.y());
+    transform.scale(dest.width() / source.width(), dest.height() / source.height());
+    return transform;
+}
+
+IntPoint AffineTransform::mapPoint(const IntPoint& point) const
+{
+    double x2, y2;
+    map(point.x(), point.y(), &x2, &y2);
+    
+    // Round the point.
+    return IntPoint(lround(x2), lround(y2));
+}
+
+FloatPoint AffineTransform::mapPoint(const FloatPoint& point) const
+{
+    double x2, y2;
+    map(point.x(), point.y(), &x2, &y2);
+
+    return FloatPoint(static_cast<float>(x2), static_cast<float>(y2));
+}
+
+void AffineTransform::blend(const AffineTransform& from, double progress)
+{
+    double srA[9], srB[9];
+
+    affineTransformDecompose(from, srA);
+    affineTransformDecompose(*this, srB);
+
+    // If x-axis of one is flipped, and y-axis of the other, convert to an unflipped rotation.
+    if ((srA[0] < 0.0 && srB[1] < 0.0) || (srA[1] < 0.0 &&  srB[0] < 0.0)) {
+        srA[0] = -srA[0];
+        srA[1] = -srA[1];
+        srA[2] += srA[2] < 0 ? piDouble : -piDouble;
+    }
+
+    // Don't rotate the long way around.
+    srA[2] = fmod(srA[2], 2.0 * piDouble);
+    srB[2] = fmod(srB[2], 2.0 * piDouble);
+
+    if (fabs(srA[2] - srB[2]) > piDouble) {
+        if (srA[2] > srB[2])
+            srA[2] -= piDouble * 2.0;
+        else
+            srB[2] -= piDouble * 2.0;
+    }
+
+    for (int i = 0; i < 9; i++)
+        srA[i] = srA[i] + progress * (srB[i] - srA[i]);
+
+    affineTransformCompose(*this, srA);
+}
+
+}