Return unique_ptrs from CFX_DIBitmap::Clone().

core/fpdfapi/render/fpdf_render_loadimage.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/render/render_int.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 114 matching lines @@
   FX_Free(m_pMaskedLine);
   FX_Free(m_pLineBuf);
   m_pCachedBitmap.reset();
   FX_Free(m_pCompData);
   CPDF_ColorSpace* pCS = m_pColorSpace;
   if (pCS && m_pDocument) {
     m_pDocument->GetPageData()->ReleaseColorSpace(pCS->GetArray());
   }
 }
 
-CFX_DIBitmap* CPDF_DIBSource::GetBitmap() const {
-  return m_pCachedBitmap ? m_pCachedBitmap.get() : Clone();
-}
-
-void CPDF_DIBSource::ReleaseBitmap(CFX_DIBitmap* pBitmap) const {
-  if (pBitmap && pBitmap != m_pCachedBitmap.get()) {
-    delete pBitmap;
-  }
-}
-
 bool CPDF_DIBSource::Load(CPDF_Document* pDoc,
                           const CPDF_Stream* pStream,
                           CPDF_DIBSource** ppMask,
                           uint32_t* pMatteColor,
                           CPDF_Dictionary* pFormResources,
                           CPDF_Dictionary* pPageResources,
                           bool bStdCS,
                           uint32_t GroupFamily,
                           bool bLoadMask) {
   if (!pStream) {
@@ skipping 1341 matching lines @@
       *pDestPixel++ = FXARGB_G(argb);
       *pDestPixel = FXARGB_R(argb);
     }
   }
 }
 
 bool CPDF_DIBSource::TransMask() const {
   return m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK &&
          m_Family == PDFCS_DEVICECMYK;
 }