Lazily create the Path in StylePath

third_party/WebKit/Source/core/style/StylePath.cpp

 // Copyright 2016 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/style/StylePath.h"
 
 #include "core/css/CSSPathValue.h"
 #include "core/svg/SVGPathByteStream.h"
 #include "core/svg/SVGPathUtilities.h"
+#include "platform/graphics/Path.h"
 
 namespace blink {
 
 StylePath::StylePath(PassRefPtr<SVGPathByteStream> pathByteStream)
     : m_byteStream(pathByteStream)
 {
     ASSERT(m_byteStream);
-    buildPathFromByteStream(*m_byteStream, m_path);
 }
 
 StylePath::~StylePath()
 {
 }
 
 PassRefPtr<StylePath> StylePath::create(PassRefPtr<SVGPathByteStream> pathByteStream)
 {
     return adoptRef(new StylePath(pathByteStream));
 }
 
 StylePath* StylePath::emptyPath()
 {
     DEFINE_STATIC_REF(StylePath, emptyPath, StylePath::create(SVGPathByteStream::create()));
     return emptyPath;
 }
 
+const Path& StylePath::path() const
+{
+    if (!m_path) {
+        m_path = adoptPtr(new Path);
+        buildPathFromByteStream(*m_byteStream, *m_path);
+    }
+    return *m_path;
+}
+
 const SVGPathByteStream& StylePath::byteStream() const
 {
     return *m_byteStream;
 }
 
 PassRefPtrWillBeRawPtr<CSSValue> StylePath::computedCSSValue() const
 {
     return CSSPathValue::create(m_byteStream, const_cast<StylePath*>(this));
 }
 
 bool StylePath::equals(const StylePath& other) const
 {
     return *m_byteStream == *other.m_byteStream;
 }
 
 } // namespace blink