core/include/fdpfapi cleanup Part I.

core/fpdfapi/fpdf_parser/ipdf_occontext.cpp

+// 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
+
+#include "core/fpdfapi/fpdf_parser/ipdf_occontext.h"
+
+#include "core/include/fpdfapi/fpdf_pageobj.h"
+
+IPDF_OCContext::~IPDF_OCContext() {}
+
+FX_BOOL IPDF_OCContext::CheckObjectVisible(const CPDF_PageObject* pObj) {
+  const CPDF_ContentMarkData* pData = pObj->m_ContentMark;
+  int nItems = pData->CountItems();
+  for (int i = 0; i < nItems; i++) {
+    const CPDF_ContentMarkItem& item = pData->GetItem(i);
+    if (item.GetName() == "OC" &&
+        item.GetParamType() == CPDF_ContentMarkItem::PropertiesDict &&
+        !CheckOCGVisible(item.GetParam())) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}