Fix partial information printed with blank window covering the center

core/include/fpdfapi/fpdf_page.h

 // Copyright 2014 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_INCLUDE_FPDFAPI_FPDF_PAGE_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_PAGE_H_
 
 #include "core/include/fxge/fx_dib.h"
@@ skipping 49 matching lines @@
 
   CPDF_PageObject* GetObjectByIndex(int index) const;
 
   FX_POSITION InsertObject(FX_POSITION posInsertAfter,
                            CPDF_PageObject* pNewObject);
 
   void Transform(const CFX_Matrix& matrix);
 
   FX_BOOL BackgroundAlphaNeeded() const { return m_bBackgroundAlphaNeeded; }
 
+  FX_BOOL HasImageMask() const { return m_bHasImageMask; }
+
   CFX_FloatRect CalcBoundingBox() const;
 
   CPDF_Dictionary* m_pFormDict;
   CPDF_Stream* m_pFormStream;
   CPDF_Document* m_pDocument;
   CPDF_Dictionary* m_pPageResources;
   CPDF_Dictionary* m_pResources;
   CFX_FloatRect m_BBox;
   int m_Transparency;
 
  protected:
   friend class CPDF_ContentParser;
   friend class CPDF_StreamContentParser;
   friend class CPDF_AllStates;
 
   enum ParseState { CONTENT_NOT_PARSED, CONTENT_PARSING, CONTENT_PARSED };
 
   void LoadTransInfo();
   void ClearCacheObjects();
 
   CFX_PtrList m_ObjectList;
   FX_BOOL m_bBackgroundAlphaNeeded;
+  FX_BOOL m_bHasImageMask;
   FX_BOOL m_bReleaseMembers;
   CPDF_ContentParser* m_pParser;
   ParseState m_ParseState;
 };
 
 class CPDF_Page : public CPDF_PageObjects, public CFX_PrivateData {
  public:
   CPDF_Page();
   ~CPDF_Page();
 
@@ skipping 78 matching lines @@
   CFX_ByteString RealizeResource(CPDF_Object* pResourceObj,
                                  const FX_CHAR* szType);
 
  private:
   CPDF_Page* m_pPage;
   CPDF_Document* m_pDocument;
   CFX_ArrayTemplate<CPDF_PageObject*> m_pageObjects;
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_PAGE_H_