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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FPDFAPI_PAGE_CPDF_PAGEOBJECTHOLDER_H_
      8 #define CORE_FPDFAPI_PAGE_CPDF_PAGEOBJECTHOLDER_H_
      9 
     10 #include <map>
     11 #include <memory>
     12 #include <vector>
     13 
     14 #include "core/fpdfapi/page/cpdf_pageobjectlist.h"
     15 #include "core/fxcrt/fx_coordinates.h"
     16 #include "core/fxcrt/fx_string.h"
     17 #include "core/fxcrt/fx_system.h"
     18 #include "core/fxcrt/unowned_ptr.h"
     19 
     20 class IFX_PauseIndicator;
     21 class CPDF_Dictionary;
     22 class CPDF_Stream;
     23 class CPDF_Document;
     24 class CPDF_ContentParser;
     25 
     26 #define PDFTRANS_GROUP 0x0100
     27 #define PDFTRANS_ISOLATED 0x0200
     28 #define PDFTRANS_KNOCKOUT 0x0400
     29 
     30 // These structs are used to keep track of resources that have already been
     31 // generated in the page object holder.
     32 struct GraphicsData {
     33   float fillAlpha;
     34   float strokeAlpha;
     35   int blendType;
     36   bool operator<(const GraphicsData& other) const;
     37 };
     38 
     39 struct FontData {
     40   ByteString baseFont;
     41   ByteString type;
     42   bool operator<(const FontData& other) const;
     43 };
     44 
     45 class CPDF_PageObjectHolder {
     46  public:
     47   CPDF_PageObjectHolder(CPDF_Document* pDoc, CPDF_Dictionary* pFormDict);
     48   virtual ~CPDF_PageObjectHolder();
     49 
     50   virtual bool IsPage() const;
     51 
     52   void ContinueParse(IFX_PauseIndicator* pPause);
     53   bool IsParsed() const { return m_ParseState == CONTENT_PARSED; }
     54 
     55   CPDF_PageObjectList* GetPageObjectList() { return &m_PageObjectList; }
     56   const CPDF_PageObjectList* GetPageObjectList() const {
     57     return &m_PageObjectList;
     58   }
     59   const CFX_Matrix& GetLastCTM() const { return m_LastCTM; }
     60 
     61   bool BackgroundAlphaNeeded() const { return m_bBackgroundAlphaNeeded; }
     62   void SetBackgroundAlphaNeeded(bool needed) {
     63     m_bBackgroundAlphaNeeded = needed;
     64   }
     65 
     66   bool HasImageMask() const { return !m_MaskBoundingBoxes.empty(); }
     67   const std::vector<CFX_FloatRect>& GetMaskBoundingBoxes() const {
     68     return m_MaskBoundingBoxes;
     69   }
     70   void AddImageMaskBoundingBox(const CFX_FloatRect& box);
     71   void Transform(const CFX_Matrix& matrix);
     72   CFX_FloatRect CalcBoundingBox() const;
     73 
     74   const UnownedPtr<CPDF_Dictionary> m_pFormDict;
     75   UnownedPtr<CPDF_Stream> m_pFormStream;
     76   UnownedPtr<CPDF_Document> m_pDocument;
     77   UnownedPtr<CPDF_Dictionary> m_pPageResources;
     78   UnownedPtr<CPDF_Dictionary> m_pResources;
     79   std::map<GraphicsData, ByteString> m_GraphicsMap;
     80   std::map<FontData, ByteString> m_FontsMap;
     81   CFX_FloatRect m_BBox;
     82   int m_iTransparency;
     83 
     84  protected:
     85   enum ParseState { CONTENT_NOT_PARSED, CONTENT_PARSING, CONTENT_PARSED };
     86 
     87   void LoadTransInfo();
     88 
     89   bool m_bBackgroundAlphaNeeded;
     90   std::vector<CFX_FloatRect> m_MaskBoundingBoxes;
     91   ParseState m_ParseState;
     92   std::unique_ptr<CPDF_ContentParser> m_pParser;
     93   CPDF_PageObjectList m_PageObjectList;
     94   CFX_Matrix m_LastCTM;
     95 };
     96 
     97 #endif  // CORE_FPDFAPI_PAGE_CPDF_PAGEOBJECTHOLDER_H_
     98