Make CPDF_Function::Load() return an unique_ptr.

core/fpdfapi/fpdf_render/fpdf_render_image.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 <utility>
 #include <vector>
@@ skipping 854 matching lines @@
 }
 
 CCodec_ScanlineDecoder* FPDFAPI_CreateFlateDecoder(
     const uint8_t* src_buf,
     uint32_t src_size,
     int width,
     int height,
     int nComps,
     int bpc,
     const CPDF_Dictionary* pParams);
+
 CFX_DIBitmap* CPDF_RenderStatus::LoadSMask(CPDF_Dictionary* pSMaskDict,
                                            FX_RECT* pClipRect,
                                            const CFX_Matrix* pMatrix) {
-  if (!pSMaskDict) {
-    return NULL;
-  }
+  if (!pSMaskDict)
+    return nullptr;
+
   CPDF_Stream* pGroup = pSMaskDict->GetStreamBy("G");
-  if (!pGroup) {
-    return NULL;
-  }
+  if (!pGroup)
+    return nullptr;
+
   std::unique_ptr<CPDF_Function> pFunc;
   CPDF_Object* pFuncObj = pSMaskDict->GetDirectObjectBy("TR");
   if (pFuncObj && (pFuncObj->IsDictionary() || pFuncObj->IsStream()))
-    pFunc.reset(CPDF_Function::Load(pFuncObj));
+    pFunc = CPDF_Function::Load(pFuncObj);
 
   CFX_Matrix matrix = *pMatrix;
   matrix.TranslateI(-pClipRect->left, -pClipRect->top);
 
   CPDF_Form form(m_pContext->GetDocument(), m_pContext->GetPageResources(),
                  pGroup);
   form.ParseContent(nullptr, nullptr, nullptr);
 
   CFX_FxgeDevice bitmap_device;
   FX_BOOL bLuminosity = pSMaskDict->GetStringBy("S") != "Alpha";
@@ skipping 97 matching lines @@
   } else if (pFunc) {
     int size = dest_pitch * height;
     for (int i = 0; i < size; i++) {
       dest_buf[i] = transfers[src_buf[i]];
     }
   } else {
     FXSYS_memcpy(dest_buf, src_buf, dest_pitch * height);
   }
   return pMask.release();
 }