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+// 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_FPDFDOC_CPDF_OCCONTEXT_H_
+#define CORE_FPDFDOC_CPDF_OCCONTEXT_H_
+
+#include <unordered_map>
+
+#include "core/fxcrt/include/fx_string.h"
+
+class CPDF_Array;
+class CPDF_Dictionary;
+class CPDF_Document;
+class CPDF_PageObject;
+
+class CPDF_OCContext {
+ public:
+ enum UsageType { View = 0, Design, Print, Export };
+
+ CPDF_OCContext(CPDF_Document* pDoc, UsageType eUsageType);
+ ~CPDF_OCContext();
+
+ bool CheckOCGVisible(const CPDF_Dictionary* pOCGDict);
+ bool CheckObjectVisible(const CPDF_PageObject* pObj);
+
+ private:
+ bool LoadOCGStateFromConfig(const CFX_ByteString& csConfig,
+ const CPDF_Dictionary* pOCGDict) const;
+ bool LoadOCGState(const CPDF_Dictionary* pOCGDict) const;
+ bool GetOCGVisible(const CPDF_Dictionary* pOCGDict);
+ bool GetOCGVE(CPDF_Array* pExpression, int nLevel);
+ bool LoadOCMDState(const CPDF_Dictionary* pOCMDDict);
+
+ CPDF_Document* const m_pDocument;
+ const UsageType m_eUsageType;
+ std::unordered_map<const CPDF_Dictionary*, bool> m_OCGStates;
+};
+
+#endif // CORE_FPDFDOC_CPDF_OCCONTEXT_H_