Return unique_ptr<>s from fxcodec/

core/fxcodec/codec/ccodec_jpegmodule.h

 // Copyright 2016 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
 
 #ifndef CORE_FXCODEC_CODEC_CCODEC_JPEGMODULE_H_
 #define CORE_FXCODEC_CODEC_CCODEC_JPEGMODULE_H_
 
+#include <memory>
+
 #include "core/fxcrt/fx_system.h"
 
 class CCodec_ScanlineDecoder;
 class CFX_DIBSource;
 struct FXJPEG_Context;
 
 #ifdef PDF_ENABLE_XFA
 class CFX_DIBAttribute;
 #endif  // PDF_ENABLE_XFA
 
 class CCodec_JpegModule {
  public:
   CCodec_JpegModule() {}
 
-  CCodec_ScanlineDecoder* CreateDecoder(const uint8_t* src_buf,
-                                        uint32_t src_size,
-                                        int width,
-                                        int height,
-                                        int nComps,
-                                        bool ColorTransform);
+  std::unique_ptr<CCodec_ScanlineDecoder> CreateDecoder(const uint8_t* src_buf,
+                                                        uint32_t src_size,
+                                                        int width,
+                                                        int height,
+                                                        int nComps,
+                                                        bool ColorTransform);
   bool LoadInfo(const uint8_t* src_buf,
                 uint32_t src_size,
                 int* width,
                 int* height,
                 int* num_components,
                 int* bits_per_components,
                 bool* color_transform);
   FXJPEG_Context* Start();
   void Finish(FXJPEG_Context* pContext);
   void Input(FXJPEG_Context* pContext,
@@ skipping 12 matching lines @@
                  int* nComps,
                  CFX_DIBAttribute* pAttribute);
 #endif  // PDF_ENABLE_XFA
 
   bool StartScanline(FXJPEG_Context* pContext, int down_scale);
   bool ReadScanline(FXJPEG_Context* pContext, uint8_t* dest_buf);
   uint32_t GetAvailInput(FXJPEG_Context* pContext, uint8_t** avail_buf_ptr);
 };
 
 #endif  // CORE_FXCODEC_CODEC_CCODEC_JPEGMODULE_H_