Refactor fx_ge part 2

core/fxge/ge/cfx_cliprgn.h

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXGE_GE_CFX_CLIPRGN_H_
+#define CORE_FXGE_GE_CFX_CLIPRGN_H_
+
+#include "core/fxge/include/fx_dib.h"
+
+class CFX_ClipRgn {
+ public:
+  enum ClipType { RectI, MaskF };
+
+  CFX_ClipRgn(int device_width, int device_height);
+  CFX_ClipRgn(const CFX_ClipRgn& src);
+  ~CFX_ClipRgn();
+
+  ClipType GetType() const { return m_Type; }
+  const FX_RECT& GetBox() const { return m_Box; }
+  CFX_DIBitmapRef GetMask() const { return m_Mask; }
+
+  void Reset(const FX_RECT& rect);
+  void IntersectRect(const FX_RECT& rect);
+  void IntersectMaskF(int left, int top, CFX_DIBitmapRef Mask);
+
+ private:
+  void IntersectMaskRect(FX_RECT rect, FX_RECT mask_box, CFX_DIBitmapRef Mask);
+
+  ClipType m_Type;
+  FX_RECT m_Box;
+  CFX_DIBitmapRef m_Mask;
+};
+
+#endif  // CORE_FXGE_GE_CFX_CLIPRGN_H_