Get rid of NULLs in core/

core/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 "core/fpdfapi/fpdf_render/render_int.h"
 
 #include <algorithm>
 
@@ skipping 659 matching lines @@
       FX_PATHPOINT* pPoints = path.GetPoints();
       C1.GetPoints(pPoints);
       D2.GetPoints(pPoints + 3);
       C2.GetPointsReverse(pPoints + 6);
       D1.GetPointsReverse(pPoints + 9);
       int fillFlags = FXFILL_WINDING | FXFILL_FULLCOVER;
       if (fill_mode & RENDER_NOPATHSMOOTH) {
         fillFlags |= FXFILL_NOPATHSMOOTH;
       }
       pDevice->DrawPath(
-          &path, NULL, NULL,
+          &path, nullptr, nullptr,
           FXARGB_MAKE(alpha, div_colors[0].comp[0], div_colors[0].comp[1],
                       div_colors[0].comp[2]),
           0, fillFlags);
     } else {
       if (d_bottom < COONCOLOR_THRESHOLD && d_top < COONCOLOR_THRESHOLD) {
         Coon_Bezier m1;
         m1.BezierInterpol(D1, D2, C1, C2);
         y_scale *= 2;
         bottom *= 2;
         Draw(x_scale, y_scale, left, bottom, C1, m1, D1.first_half(),
@@ skipping 346 matching lines @@
                             pPattern->x_step());
   max_col = (int)FXSYS_floor((clip_box_p.right - pPattern->bbox().left) /
                              pPattern->x_step());
   min_row = (int)FXSYS_ceil((clip_box_p.bottom - pPattern->bbox().top) /
                             pPattern->y_step());
   max_row = (int)FXSYS_floor((clip_box_p.top - pPattern->bbox().bottom) /
                              pPattern->y_step());
 
   if (width > clip_box.Width() || height > clip_box.Height() ||
       width * height > clip_box.Width() * clip_box.Height()) {
-    CPDF_GraphicStates* pStates = NULL;
+    CPDF_GraphicStates* pStates = nullptr;
     if (!pPattern->colored())
       pStates = CloneObjStates(pPageObj, bStroke);
 
     CPDF_Dictionary* pFormResource = nullptr;
     if (pPattern->form()->m_pFormDict)
       pFormResource = pPattern->form()->m_pFormDict->GetDictBy("Resources");
 
     for (int col = min_col; col <= max_col; col++)
       for (int row = min_row; row <= max_row; row++) {
         FX_FLOAT orig_x, orig_y;
@@ skipping 132 matching lines @@
     }
   }
   if (bStroke) {
     CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
     if (StrokeColor.IsPattern()) {
       DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, TRUE);
       bStroke = FALSE;
     }
   }
 }