Kill Func_Renderpage global function pointer, it never changes.

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_
 
-#ifdef _WIN32
-#include <tchar.h>
-#include <math.h>
-#endif
-
 #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_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 "../../public/fpdfview.h"
 
-
-#ifndef FX_GetAValue
-/** @brief It retrieves an intensity value for the alpha component of a #FX_ARGB value. */
-#define FX_GetAValue(argb)                      ((argb & 0xFF000000) >> 24)
-#endif
-
-#ifndef FX_GetRValue
-/** @brief It retrieves an intensity value for the red component of a #FX_ARGB value. */
-#define FX_GetRValue(argb)                      ((argb & 0x00FF0000) >> 16)
-#endif
-
-#ifndef FX_GetGValue
-/** @brief It retrieves an intensity value for the green component of a #FX_ARGB value. */
-#define FX_GetGValue(argb)                      ((argb & 0x0000FF00) >> 8)
-#endif
-
-#ifndef FX_GetBValue
-/** @brief It retrieves an intensity value for the blue component of a #FX_ARGB value. */
-#define FX_GetBValue(argb)                      (argb & 0x000000FF)
+#ifdef _WIN32
+#include <tchar.h>
+#include <math.h>
 #endif
 
 #ifndef FX_ARGBTOCOLORREF
 /** @brief Convert a #FX_ARGB to a #FX_COLORREF. */
 #define FX_ARGBTOCOLORREF(argb)         ((((FX_DWORD)argb & 0x00FF0000) >> 16)|((FX_DWORD)argb & 0x0000FF00)|(((FX_DWORD)argb & 0x000000FF) << 16))
 #endif
 
 #ifndef FX_COLORREFTOARGB
 /** @brief Convert a #FX_COLORREF to a #FX_ARGB. */
 #define FX_COLORREFTOARGB(rgb)          ((FX_DWORD)0xFF000000|(((FX_DWORD)rgb & 0x000000FF) << 16)|((FX_DWORD)rgb & 0x0000FF00)|(((FX_DWORD)rgb & 0x00FF0000) >> 16))
 #endif
 
 typedef unsigned int FX_UINT;
-
-#include "../../public/fpdfview.h"
+class CRenderContext;
+class IFSDK_PAUSE_Adapter;
 
 class CPDF_CustomAccess final : public IFX_FileRead
 {
 public:
         CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess);
         ~CPDF_CustomAccess() {}
 
         virtual FX_FILESIZE     GetSize() override { return m_FileAccess.m_FileLen; }
 
         virtual void            Release() override { delete this; }
 
         virtual FX_BOOL         ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
 
 private:
         FPDF_FILEACCESS         m_FileAccess;
 };
 
-void            FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable);
-FPDF_BOOL       FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy);
-
+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);
 
 #endif  // FPDFSDK_INCLUDE_FSDK_DEFINE_H_