Take advantage of implicit std::unique_ptr<>(nulltpr_t) ctor.

fpdfsdk/fpdfview.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 "public/fpdfview.h"
 
 #include <memory>
 #include <utility>
@@ skipping 557 matching lines @@
       pDst->Create(size_x, size_y, FXDIB_Rgb32);
       FXSYS_memset(pDst->GetBuffer(), -1, pitch * size_y);
       pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap.get(), 0, 0,
                             FXDIB_BLEND_NORMAL, nullptr, FALSE, nullptr);
       WinDC.StretchDIBits(pDst.get(), 0, 0, size_x, size_y);
     } else {
       WinDC.SetDIBits(pBitmap.get(), 0, 0);
     }
   }
 
-  pPage->SetRenderContext(std::unique_ptr<CPDF_PageRenderContext>());
+  pPage->SetRenderContext(nullptr);
 }
 #endif  // defined(_WIN32)
 
 DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
                                              FPDF_PAGE page,
                                              int start_x,
                                              int start_y,
                                              int size_x,
                                              int size_y,
                                              int rotate,
                                              int flags) {
   if (!bitmap)
     return;
 
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
 
   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
   CFX_FxgeDevice* pDevice = new CFX_FxgeDevice;
   pContext->m_pDevice.reset(pDevice);
   CFX_DIBitmap* pBitmap = CFXBitmapFromFPDFBitmap(bitmap);
   pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
 
   FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
                          rotate, flags, TRUE, nullptr);
 
-  pPage->SetRenderContext(std::unique_ptr<CPDF_PageRenderContext>());
+  pPage->SetRenderContext(nullptr);
 }
 
 #ifdef _SKIA_SUPPORT_
 DLLEXPORT FPDF_RECORDER STDCALL FPDF_RenderPageSkp(FPDF_PAGE page,
                                                    int size_x,
                                                    int size_y) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return nullptr;
 
   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
   CFX_FxgeDevice* skDevice = new CFX_FxgeDevice;
   FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y);
   pContext->m_pDevice.reset(skDevice);
   FPDF_RenderPage_Retail(pContext, page, 0, 0, size_x, size_y, 0, 0, TRUE,
                          nullptr);
-  pPage->SetRenderContext(std::unique_ptr<CPDF_PageRenderContext>());
+  pPage->SetRenderContext(nullptr);
   return recorder;
 }
 #endif
 
 DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page) {
   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
   if (!page)
     return;
 #ifdef PDF_ENABLE_XFA
   pPage->Release();
@@ skipping 459 matching lines @@
   if (!buffer) {
     *buflen = len;
   } else if (*buflen >= len) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }