[Line Layout API] Add LineLayoutSVGInline and LineLayoutSVGTextPath

third_party/WebKit/Source/core/layout/api/LineLayoutSVGTextPath.h

+// Copyright 2015 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.
+
+#ifndef LineLayoutSVGTextPath_h
+#define LineLayoutSVGTextPath_h
+
+#include "core/layout/api/LineLayoutSVGInline.h"
+#include "core/layout/svg/LayoutSVGTextPath.h"
+
+namespace blink {
+
+class LineLayoutSVGTextPath : public LineLayoutSVGInline {
+public:
+    explicit LineLayoutSVGTextPath(LayoutSVGTextPath* layoutSVGTextPath)
+        : LineLayoutSVGInline(layoutSVGTextPath)
+    {
+    }
+
+    explicit LineLayoutSVGTextPath(const LineLayoutItem& item)
+        : LineLayoutSVGInline(item)
+    {
+        ASSERT(!item || item.isSVGTextPath());
+    }
+
+    explicit LineLayoutSVGTextPath(std::nullptr_t) : LineLayoutSVGInline(nullptr) { }
+
+    LineLayoutSVGTextPath() { }
+
+    Path layoutPath() const
+    {
+        return toSVGTextPath()->layoutPath();
+    }
+
+    float calculateStartOffset(float pathLength) const
+    {
+        return toSVGTextPath()->calculateStartOffset(pathLength);
+    }
+
+private:
+    LayoutSVGTextPath* toSVGTextPath()
+    {
+        return toLayoutSVGTextPath(layoutObject());
+    }
+
+    const LayoutSVGTextPath* toSVGTextPath() const
+    {
+        return toLayoutSVGTextPath(layoutObject());
+    }
+};
+
+} // namespace blink
+
+#endif // LineLayoutSVGTextPath_h