Tidy up shading patterns

core/src/fpdfapi/fpdf_page/fpdf_page_parser.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 "core/src/fpdfapi/fpdf_page/pageint.h"
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 1084 matching lines @@
                              CPDF_ColorSpace* pCS);
 
 void CPDF_StreamContentParser::Handle_ShadeFill() {
   if (m_Options.m_bTextOnly) {
     return;
   }
   CPDF_Pattern* pPattern = FindPattern(GetString(0), TRUE);
   if (!pPattern) {
     return;
   }
-  if (pPattern->m_PatternType != PATTERN_SHADING) {
+  if (pPattern->m_PatternType != CPDF_Pattern::SHADING) {
     return;
   }
-  CPDF_ShadingPattern* pShading = (CPDF_ShadingPattern*)pPattern;
+  CPDF_ShadingPattern* pShading = static_cast<CPDF_ShadingPattern*>(pPattern);
   if (!pShading->m_bShadingObj) {
     return;
   }
   if (!pShading->Load()) {
     return;
   }
   CPDF_ShadingObject* pObj = new CPDF_ShadingObject;
   pObj->m_pShading = pShading;
   SetGraphicStates(pObj, FALSE, FALSE, FALSE);
   pObj->m_Matrix = m_pCurStates->m_CTM;
@@ skipping 399 matching lines @@
     m_pObjectList->m_ObjectList.AddTail(pPathObj);
   }
   if (PathClipType) {
     if (!matrix.IsIdentity()) {
       Path.Transform(&matrix);
       matrix.SetIdentity();
     }
     m_pCurStates->m_ClipPath.AppendPath(Path, PathClipType, TRUE);
   }
 }