Introduce "underlying types" to abstract XFA differences.

fpdfsdk/include/fsdk_define.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 FPDFSDK_INCLUDE_FSDK_DEFINE_H_
 #define FPDFSDK_INCLUDE_FSDK_DEFINE_H_
 
 #include "../../xfa/include/fwl/adapter/fwl_adaptertimermgr.h"
 #include "../../xfa/include/fxbarcode/BC_BarCode.h"
 #include "../../xfa/include/fxfa/fxfa.h"
 #include "../../xfa/include/fxgraphics/fx_graphics.h"
 #include "../../xfa/include/fxjse/fxjse.h"
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_pageobj.h"
 #include "core/include/fpdfapi/fpdf_parser.h"
 #include "core/include/fpdfapi/fpdf_render.h"
 #include "core/include/fpdfapi/fpdf_serial.h"
 #include "core/include/fpdfapi/fpdfapi.h"
 #include "core/include/fpdfdoc/fpdf_doc.h"
 #include "core/include/fpdfdoc/fpdf_vt.h"
 #include "core/include/fxge/fx_ge.h"
 #include "core/include/fxge/fx_ge_win32.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_page.h"
 #include "public/fpdfview.h"
 
 #ifdef _WIN32
 #include <tchar.h>
 #include <math.h>
 #endif
 
 // Convert a #FX_ARGB to a #FX_COLORREF.
 #define FX_ARGBTOCOLORREF(argb)                                            \
   ((((FX_DWORD)argb & 0x00FF0000) >> 16) | ((FX_DWORD)argb & 0x0000FF00) | \
@@ skipping 45 matching lines @@
   virtual FX_BOOL WriteBlock(const void* buffer,
                              FX_FILESIZE offset,
                              size_t size);
   virtual FX_BOOL Flush();
 
  protected:
   FPDF_FILEHANDLER* m_pFS;
   FX_FILESIZE m_nCurPos;
 };
 
+// Object types for public FPDF_ types; these correspond to next layer down
+// from fpdfsdk. For master, these are CPDF_ types, but for XFA, these are
+// CPDFXFA_ types.
+using UnderlyingDocumentType = CPDFXFA_Document;
+using UnderlyingPageType = CPDFXFA_Page;
+
+// Conversions to/from underlying types.
+UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc);
+FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc);
+
+UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page);
+
 // Conversions to/from FPDF_ types.
 CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc);
 FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc);
 
 CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page);
 
 void DropContext(void* data);
 void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable);
 FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy);
 void FPDF_RenderPage_Retail(CRenderContext* pContext,
                             FPDF_PAGE page,
                             int start_x,
                             int start_y,
                             int size_x,
                             int size_y,
                             int rotate,
                             int flags,
                             FX_BOOL bNeedToRestore,
                             IFSDK_PAUSE_Adapter* pause);
 
 void CheckUnSupportError(CPDF_Document* pDoc, FX_DWORD err_code);
 void CheckUnSupportAnnot(CPDF_Document* pDoc, const CPDF_Annot* pPDFAnnot);
 void ProcessParseError(FX_DWORD err_code);
 
 #endif  // FPDFSDK_INCLUDE_FSDK_DEFINE_H_