Add type cast definitions for CPDF_Array.

core/src/fpdfapi/fpdf_page/fpdf_page_pattern.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_page.h"
 #include "pageint.h"
 
 CPDF_Pattern::CPDF_Pattern(const CFX_AffineMatrix* pParentMatrix)
@@ skipping 100 matching lines @@
   if (pShadingDict == NULL) {
     return FALSE;
   }
   if (m_nFuncs) {
     for (int i = 0; i < m_nFuncs; i++)
       delete m_pFunctions[i];
     m_nFuncs = 0;
   }
   CPDF_Object* pFunc = pShadingDict->GetElementValue(FX_BSTRC("Function"));
   if (pFunc) {
-    if (pFunc->GetType() == PDFOBJ_ARRAY) {
-      m_nFuncs = ((CPDF_Array*)pFunc)->GetCount();
-      if (m_nFuncs > 4) {
-        m_nFuncs = 4;
-      }
+    if (CPDF_Array* pArray = pFunc->AsArray()) {
+      m_nFuncs = std::min<int>(pArray->GetCount(), 4);
+
       for (int i = 0; i < m_nFuncs; i++) {
-        m_pFunctions[i] =
-            CPDF_Function::Load(((CPDF_Array*)pFunc)->GetElementValue(i));
+        m_pFunctions[i] = CPDF_Function::Load(pArray->GetElementValue(i));
       }
     } else {
       m_pFunctions[0] = CPDF_Function::Load(pFunc);
       m_nFuncs = 1;
     }
   }
   CPDF_Object* pCSObj = pShadingDict->GetElementValue(FX_BSTRC("ColorSpace"));
   if (pCSObj == NULL) {
     return FALSE;
   }
@@ skipping 152 matching lines @@
     }
     stream.m_BitStream.SkipBits(stream.m_nComps * stream.m_nCompBits *
                                 color_count);
     if (bGouraud) {
       stream.m_BitStream.ByteAlign();
     }
   }
   rect.Transform(pMatrix);
   return rect;
 }