Implement inverse & invertSelf function in DOMMatrix & DOMMatrixReadOnly.

third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/DOMMatrix.h"
 
 namespace blink {
 
 DOMMatrixReadOnly* DOMMatrixReadOnly::create(Vector<double> sequence, ExceptionState& exceptionState)
 {
@@ skipping 86 matching lines @@
 DOMMatrix* DOMMatrixReadOnly::flipY()
 {
     DOMMatrix* flipY = DOMMatrix::create(this);
     flipY->setM21(-this->m21());
     flipY->setM22(-this->m22());
     flipY->setM23(-this->m23());
     flipY->setM24(-this->m24());
     return flipY;
 }
 
+DOMMatrix* DOMMatrixReadOnly::inverse()
+{
+    return DOMMatrix::create(this)->invertSelf();
+}
+
 DOMFloat32Array* DOMMatrixReadOnly::toFloat32Array() const
 {
     float array[] = {
         static_cast<float>(m_matrix->m11()), static_cast<float>(m_matrix->m12()), static_cast<float>(m_matrix->m13()), static_cast<float>(m_matrix->m14()),
         static_cast<float>(m_matrix->m21()), static_cast<float>(m_matrix->m22()), static_cast<float>(m_matrix->m23()), static_cast<float>(m_matrix->m24()),
         static_cast<float>(m_matrix->m31()), static_cast<float>(m_matrix->m32()), static_cast<float>(m_matrix->m33()), static_cast<float>(m_matrix->m34()),
         static_cast<float>(m_matrix->m41()), static_cast<float>(m_matrix->m42()), static_cast<float>(m_matrix->m43()), static_cast<float>(m_matrix->m44())
     };
 
     return DOMFloat32Array::create(array, 16);
@@ skipping 24 matching lines @@
         << m21() << ", " << m22() << ", " << m23() << ", " << m24() << ", "
         << m31() << ", " << m32() << ", " << m33() << ", " << m34() << ", "
         << m41() << ", " << m42() << ", " << m43() << ", " << m44();
     }
     stream << ")";
 
     return String(stream.str().c_str());
 }
 
 } // namespace blink