Tidy up shading patterns

core/src/fpdfapi/fpdf_render/fpdf_render_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 "render_int.h"
 
 #include "core/include/fpdfapi/fpdf_pageobj.h"
 #include "core/include/fpdfapi/fpdf_render.h"
@@ skipping 1169 matching lines @@
   delete pPatternBitmap;
 }
 void CPDF_RenderStatus::DrawPathWithPattern(CPDF_PathObject* pPathObj,
                                             const CFX_Matrix* pObj2Device,
                                             CPDF_Color* pColor,
                                             FX_BOOL bStroke) {
   CPDF_Pattern* pattern = pColor->GetPattern();
   if (!pattern) {
     return;
   }
-  if (pattern->m_PatternType == PATTERN_TILING) {
-    DrawTilingPattern((CPDF_TilingPattern*)pattern, pPathObj, pObj2Device,
-                      bStroke);
+  if (pattern->m_PatternType == CPDF_Pattern::TILING) {
+    DrawTilingPattern(static_cast<CPDF_TilingPattern*>(pattern), pPathObj,
+                      pObj2Device, bStroke);
   } else {
-    DrawShadingPattern((CPDF_ShadingPattern*)pattern, pPathObj, pObj2Device,
-                       bStroke);
+    DrawShadingPattern(static_cast<CPDF_ShadingPattern*>(pattern), pPathObj,
+                       pObj2Device, bStroke);
   }
 }
 void CPDF_RenderStatus::ProcessPathPattern(CPDF_PathObject* pPathObj,
                                            const CFX_Matrix* pObj2Device,
                                            int& filltype,
                                            FX_BOOL& bStroke) {
   if (filltype) {
     CPDF_Color& FillColor = *pPathObj->m_ColorState.GetFillColor();
     if (FillColor.m_pCS && FillColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
       DrawPathWithPattern(pPathObj, pObj2Device, &FillColor, FALSE);
       filltype = 0;
     }
   }
   if (bStroke) {
     CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
     if (StrokeColor.m_pCS && StrokeColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
       DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, TRUE);
       bStroke = FALSE;
     }
   }
 }