Split ClipTransformRecorder into {Clip,Transform}Recorder.

ui/compositor/clip_recorder.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 UI_COMPOSITOR_CLIP_RECORDER_H_
+#define UI_COMPOSITOR_CLIP_RECORDER_H_
+
+#include "base/macros.h"
+#include "ui/compositor/compositor_export.h"
+
+namespace cc {
+class DisplayItem;
+class DisplayItemList;
+}
+
+namespace gfx {
+class Path;
+class Rect;
+}
+
+namespace ui {
+class PaintContext;
+
+// A class to provide scoped clips of painting to a DisplayItemList. The clip
+// provided will be applied to any DisplayItems added to the DisplayItemList
+// while this object is alive. In other words, any nested PaintRecorders or
+// other ClipRecorders will be clipped.
+class COMPOSITOR_EXPORT ClipRecorder {
+ public:
+  explicit ClipRecorder(const PaintContext& context);
+  ~ClipRecorder();
+
+  void ClipRect(const gfx::Rect& clip_rect);
+  void ClipPath(const gfx::Path& clip_path);
+  void ClipPathWithAntiAliasing(const gfx::Path& clip_path);
+
+ private:
+  enum Closer {
+    CLIP_RECT,
+    CLIP_PATH,
+  };
+  const PaintContext& context_;
+  // If someone needs to do more than this many operations with a single
+  // ClipRecorder then increase the size of the closers_ array.
+  Closer closers_[4];
+  size_t num_closers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipRecorder);
+};
+
+}  // namespace ui
+
+#endif  // UI_COMPOSITOR_CLIP_RECORDER_H_