[Merge to XFA] Revert "Revert "Add type cast definitions for CPDF_Dictionary.""

core/src/fpdfapi/fpdf_page/fpdf_page_func.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 <limits.h>
 
 #include "../../../../third_party/base/numerics/safe_conversions_impl.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
@@ skipping 800 matching lines @@
 CPDF_Function* CPDF_Function::Load(CPDF_Object* pFuncObj) {
   if (pFuncObj == NULL) {
     return NULL;
   }
   CPDF_Function* pFunc = NULL;
   int type;
   if (pFuncObj->GetType() == PDFOBJ_STREAM) {
     type = ((CPDF_Stream*)pFuncObj)
                ->GetDict()
                ->GetInteger(FX_BSTRC("FunctionType"));
-  } else if (pFuncObj->GetType() == PDFOBJ_DICTIONARY) {
-    type = ((CPDF_Dictionary*)pFuncObj)->GetInteger(FX_BSTRC("FunctionType"));
+  } else if (CPDF_Dictionary* pDict = pFuncObj->AsDictionary()) {
+    type = pDict->GetInteger(FX_BSTRC("FunctionType"));
   } else {
     return NULL;
   }
   if (type == 0) {
     pFunc = new CPDF_SampledFunc;
   } else if (type == 2) {
     pFunc = new CPDF_ExpIntFunc;
   } else if (type == 3) {
     pFunc = new CPDF_StitchFunc;
   } else if (type == 4) {
@@ skipping 13 matching lines @@
 }
 CPDF_Function::~CPDF_Function() {
   FX_Free(m_pDomains);
   FX_Free(m_pRanges);
 }
 FX_BOOL CPDF_Function::Init(CPDF_Object* pObj) {
   CPDF_Dictionary* pDict;
   if (pObj->GetType() == PDFOBJ_STREAM) {
     pDict = ((CPDF_Stream*)pObj)->GetDict();
   } else {
-    pDict = (CPDF_Dictionary*)pObj;
+    pDict = pObj->AsDictionary();
   }
   CPDF_Array* pDomains = pDict->GetArray(FX_BSTRC("Domain"));
   if (pDomains == NULL) {
     return FALSE;
   }
   m_nInputs = pDomains->GetCount() / 2;
   if (m_nInputs == 0) {
     return FALSE;
   }
   m_pDomains = FX_Alloc2D(FX_FLOAT, m_nInputs, 2);
@@ skipping 42 matching lines @@
     for (int i = 0; i < m_nOutputs; i++) {
       if (results[i] < m_pRanges[i * 2]) {
         results[i] = m_pRanges[i * 2];
       } else if (results[i] > m_pRanges[i * 2 + 1]) {
         results[i] = m_pRanges[i * 2 + 1];
       }
     }
   }
   return TRUE;
 }