Use smart pointers for various Jbig2 decoding contexts

core/fxge/dib/fx_dib_composite.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/fxcodec/include/fx_codec.h"
 #include "core/fxge/dib/dib_int.h"
 #include "core/fxge/include/fx_ge.h"
 
@@ skipping 4675 matching lines @@
     return TRUE;
   }
   if (m_bpp == 1) {
     ASSERT(!IsCmykImage() && (uint8_t)(alpha_flag >> 8) == 0);
     int left_shift = rect.left % 8;
     int right_shift = rect.right % 8;
     int new_width = rect.right / 8 - rect.left / 8;
     int index = 0;
     if (m_pPalette) {
       for (int i = 0; i < 2; i++) {
-        if (m_pPalette[i] == color) {
+        if (m_pPalette.get()[i] == color) {
           index = i;
         }
       }
     } else {
       index = ((uint8_t)color == 0xff) ? 1 : 0;
     }
     for (int row = rect.top; row < rect.bottom; row++) {
       uint8_t* dest_scan_top = (uint8_t*)GetScanline(row) + rect.left / 8;
       uint8_t* dest_scan_top_r = (uint8_t*)GetScanline(row) + rect.right / 8;
       uint8_t left_flag = *dest_scan_top & (255 << (8 - left_shift));
@@ skipping 322 matching lines @@
   }
   src_alpha_scan = m_pScanlineAlphaV;
   dest_alpha_scan = dest_alpha_buf;
   if (dest_alpha_scan) {
     for (i = 0; i < m_DestHeight; i++) {
       *dest_alpha_scan = *src_alpha_scan++;
       dest_alpha_scan += y_alpha_step;
     }
   }
 }