Remove PageObject's m_Type and add As<Type> functions

fpdfsdk/src/fpdfeditpage.cpp

 // 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
 
 #include "public/fpdf_edit.h"
 
 #include "fpdfsdk/include/fsdk_define.h"
 #include "public/fpdf_formfill.h"
@@ skipping 122 matching lines @@
           "Page")) {
     return;
   }
   CPDF_PageObject* pPageObj = (CPDF_PageObject*)page_obj;
   if (!pPageObj)
     return;
 
   pPage->GetPageObjectList()->push_back(
       std::unique_ptr<CPDF_PageObject>(pPageObj));
 
-  switch (pPageObj->m_Type) {
+  switch (pPageObj->GetType()) {
     case FPDF_PAGEOBJ_PATH: {
-      CPDF_PathObject* pPathObj = (CPDF_PathObject*)pPageObj;
+      CPDF_PathObject* pPathObj = pPageObj->AsPath();
       pPathObj->CalcBoundingBox();
       break;
     }
     case FPDF_PAGEOBJ_TEXT: {
       break;
     }
     case FPDF_PAGEOBJ_IMAGE: {
-      CPDF_ImageObject* pImageObj = (CPDF_ImageObject*)pPageObj;
+      CPDF_ImageObject* pImageObj = pPageObj->AsImage();
       pImageObj->CalcBoundingBox();
       break;
     }
     case FPDF_PAGEOBJ_SHADING: {
-      CPDF_ShadingObject* pShadingObj = (CPDF_ShadingObject*)pPageObj;
+      CPDF_ShadingObject* pShadingObj = pPageObj->AsShading();
       pShadingObj->CalcBoundingBox();
       break;
     }
     case FPDF_PAGEOBJ_FORM: {
-      CPDF_FormObject* pFormObj = (CPDF_FormObject*)pPageObj;
+      CPDF_FormObject* pFormObj = pPageObj->AsForm();
       pFormObj->CalcBoundingBox();
       break;
     }
     default:
       break;
   }
 }
 
 DLLEXPORT int STDCALL FPDFPage_CountObject(FPDF_PAGE page) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
@@ skipping 35 matching lines @@
     return TRUE;
 
   CPDF_Dictionary* pSMaskDict =
       pGeneralState ? ToDictionary(pGeneralState->m_pSoftMask) : NULL;
   if (pSMaskDict)
     return TRUE;
 
   if (pGeneralState && pGeneralState->m_FillAlpha != 1.0f)
     return TRUE;
 
-  if (pPageObj->m_Type == CPDF_PageObject::PATH) {
+  if (pPageObj->IsPath()) {
     if (pGeneralState && pGeneralState->m_StrokeAlpha != 1.0f)
       return TRUE;
   }
 
-  if (pPageObj->m_Type == CPDF_PageObject::FORM) {
-    CPDF_FormObject* pFormObj = (CPDF_FormObject*)pPageObj;
+  if (pPageObj->IsForm()) {
+    CPDF_FormObject* pFormObj = pPageObj->AsForm();
     if (pFormObj->m_pForm &&
         (pFormObj->m_pForm->m_Transparency & PDFTRANS_ISOLATED))
       return TRUE;
     if (pFormObj->m_pForm &&
         (!(pFormObj->m_pForm->m_Transparency & PDFTRANS_ISOLATED) &&
          (pFormObj->m_pForm->m_Transparency & PDFTRANS_GROUP)))
       return TRUE;
   }
   return FALSE;
 }
@@ skipping 67 matching lines @@
       !pPage->m_pFormDict->GetElement("Type")->GetDirect() ||
       pPage->m_pFormDict->GetElement("Type")->GetDirect()->GetString().Compare(
           "Page")) {
     return;
   }
   CPDF_Dictionary* pDict = pPage->m_pFormDict;
   rotate %= 4;
 
   pDict->SetAt("Rotate", new CPDF_Number(rotate * 90));
 }