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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_PAGE_H_
      8 #define CORE_FPDFAPI_PAGE_CPDF_PAGE_H_
      9 
     10 #include <map>
     11 #include <memory>
     12 
     13 #include "core/fpdfapi/page/cpdf_pageobjectholder.h"
     14 #include "core/fxcrt/fx_basic.h"
     15 #include "core/fxcrt/fx_coordinates.h"
     16 #include "core/fxcrt/fx_system.h"
     17 
     18 class CPDF_Dictionary;
     19 class CPDF_Document;
     20 class CPDF_Object;
     21 class CPDF_PageRenderCache;
     22 class CPDF_PageRenderContext;
     23 
     24 // These structs are used to keep track of resources that have already been
     25 // generated in the page.
     26 struct GraphicsData {
     27   FX_FLOAT fillAlpha;
     28   FX_FLOAT strokeAlpha;
     29   bool operator<(const GraphicsData& other) const;
     30 };
     31 
     32 struct FontData {
     33   CFX_ByteString baseFont;
     34   bool operator<(const FontData& other) const;
     35 };
     36 
     37 class CPDF_Page : public CPDF_PageObjectHolder {
     38  public:
     39   class View {};  // Caller implements as desired, empty here due to layering.
     40 
     41   CPDF_Page(CPDF_Document* pDocument,
     42             CPDF_Dictionary* pPageDict,
     43             bool bPageCache);
     44   ~CPDF_Page() override;
     45 
     46   void ParseContent();
     47 
     48   CFX_Matrix GetDisplayMatrix(int xPos,
     49                               int yPos,
     50                               int xSize,
     51                               int ySize,
     52                               int iRotate) const;
     53 
     54   FX_FLOAT GetPageWidth() const { return m_PageWidth; }
     55   FX_FLOAT GetPageHeight() const { return m_PageHeight; }
     56   CFX_FloatRect GetPageBBox() const { return m_BBox; }
     57   const CFX_Matrix& GetPageMatrix() const { return m_PageMatrix; }
     58   CPDF_Object* GetPageAttr(const CFX_ByteString& name) const;
     59   CPDF_PageRenderCache* GetRenderCache() const { return m_pPageRender.get(); }
     60 
     61   CPDF_PageRenderContext* GetRenderContext() const {
     62     return m_pRenderContext.get();
     63   }
     64   void SetRenderContext(std::unique_ptr<CPDF_PageRenderContext> pContext);
     65 
     66   View* GetView() const { return m_pView; }
     67   void SetView(View* pView) { m_pView = pView; }
     68 
     69   std::map<GraphicsData, CFX_ByteString> m_GraphicsMap;
     70   std::map<FontData, CFX_ByteString> m_FontsMap;
     71 
     72  protected:
     73   void StartParse();
     74 
     75   FX_FLOAT m_PageWidth;
     76   FX_FLOAT m_PageHeight;
     77   CFX_Matrix m_PageMatrix;
     78   View* m_pView;
     79   std::unique_ptr<CPDF_PageRenderCache> m_pPageRender;
     80   std::unique_ptr<CPDF_PageRenderContext> m_pRenderContext;
     81 };
     82 
     83 #endif  // CORE_FPDFAPI_PAGE_CPDF_PAGE_H_
     84