Revert "Revert "Add type cast definitions for CPDF_Dictionary.""

core/src/fpdfapi/fpdf_render/fpdf_render.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 "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_render.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "../fpdf_page/pageint.h"
@@ skipping 720 matching lines @@
 FX_BOOL CPDF_RenderStatus::ProcessTransparency(
     const CPDF_PageObject* pPageObj,
     const CFX_AffineMatrix* pObj2Device) {
   const CPDF_GeneralStateData* pGeneralState = pPageObj->m_GeneralState;
   int blend_type =
       pGeneralState ? pGeneralState->m_BlendType : FXDIB_BLEND_NORMAL;
   if (blend_type == FXDIB_BLEND_UNSUPPORTED) {
     return TRUE;
   }
   CPDF_Dictionary* pSMaskDict =
-      pGeneralState ? (CPDF_Dictionary*)pGeneralState->m_pSoftMask : NULL;
+      pGeneralState ? ToDictionary(pGeneralState->m_pSoftMask) : NULL;
   if (pSMaskDict) {
     if (pPageObj->m_Type == PDFPAGE_IMAGE &&
         ((CPDF_ImageObject*)pPageObj)
             ->m_pImage->GetDict()
             ->KeyExist(FX_BSTRC("SMask"))) {
       pSMaskDict = NULL;
     }
   }
   CPDF_Dictionary* pFormResource = NULL;
   FX_FLOAT group_alpha = 1.0f;
@@ skipping 678 matching lines @@
                              m_Rect.top, m_Rect.Width(), m_Rect.Height());
   }
 }
 FX_BOOL IPDF_OCContext::CheckObjectVisible(const CPDF_PageObject* pObj) {
   const CPDF_ContentMarkData* pData = pObj->m_ContentMark;
   int nItems = pData->CountItems();
   for (int i = 0; i < nItems; i++) {
     CPDF_ContentMarkItem& item = pData->GetItem(i);
     if (item.GetName() == FX_BSTRC("OC") &&
         item.GetParamType() == CPDF_ContentMarkItem::PropertiesDict) {
-      CPDF_Dictionary* pOCG = (CPDF_Dictionary*)item.GetParam();
+      CPDF_Dictionary* pOCG =
+          ToDictionary(static_cast<CPDF_Object*>(item.GetParam()));
       if (!CheckOCGVisible(pOCG)) {
         return FALSE;
       }
     }
   }
   return TRUE;
 }