Implement scale*() methods in DOMMatrix.

Source/core/dom/DOMMatrix.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 "config.h"
 #include "core/dom/DOMMatrix.h"
 
 namespace blink {
 
 DOMMatrix* DOMMatrix::create()
@@ skipping 34 matching lines @@
     m_matrix[3][3] = m44;
     m_is2D = is2D;
 }
 
 void DOMMatrix::setIs2D(bool value)
 {
     if (m_is2D)
         m_is2D = value;
 }
 
+DOMMatrix* DOMMatrix::scaleSelf(double scale, double ox, double oy)
+{
+    return scaleNonUniformSelf(scale, scale, 1, ox, oy);
+}
+
+DOMMatrix* DOMMatrix::scale3dSelf(double scale, double ox, double oy, double oz)
+{
+    return scaleNonUniformSelf(scale, scale, scale, ox, oy, oz);
+}
+
+DOMMatrix* DOMMatrix::scaleNonUniformSelf(double sx, double sy, double sz,
+    double ox, double oy, double oz)
+{
+    if (sz != 1 || oz)
+        m_is2D = false;
+
+    if (sx == 1 && sy == 1 && sz == 1)
+        return this;
+
+    bool hasTranslation = (ox || oy || oz);
+
+    if (hasTranslation)
+        translateSelf(ox, oy, oz);
+
+    if (isIdentity()) {

[krit, 2014/08/08 05:47:34]

Why not implement this in TransformationMatrix?

[zino, 2014/08/17 11:35:25]

Done.

+        m_matrix[0][0] = sx;
+        m_matrix[1][1] = sy;
+        m_matrix[2][2] = sz;
+    } else {
+        if (sx != 1) {
+            m_matrix[0][0] *= sx;
+            m_matrix[0][1] *= sx;
+            m_matrix[0][2] *= sx;
+            m_matrix[0][3] *= sx;
+        }
+        if (sy != 1) {
+            m_matrix[1][0] *= sy;
+            m_matrix[1][1] *= sy;
+            m_matrix[1][2] *= sy;
+            m_matrix[1][3] *= sy;
+        }
+        if (sz != 1) {
+            m_matrix[2][0] *= sz;
+            m_matrix[2][1] *= sz;
+            m_matrix[2][2] *= sz;
+            m_matrix[2][3] *= sz;
+        }
+    }
+
+    if (hasTranslation)
+        translateSelf(-ox, -oy, -oz);
+
+    return this;
+}
+
 } // namespace blink