Use virtual function to retrieve interface pointer

xfa/fwl/lightwidget/cfwl_picturebox.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 "xfa/fwl/lightwidget/cfwl_picturebox.h"
 
 #include <memory>
 
+IFWL_PictureBox* CFWL_PictureBox::GetWidget() {
+  return static_cast<IFWL_PictureBox*>(m_pIface.get());
+}
+
+const IFWL_PictureBox* CFWL_PictureBox::GetWidget() const {
+  return static_cast<IFWL_PictureBox*>(m_pIface.get());
+}
+
 CFWL_PictureBox* CFWL_PictureBox::Create() {
   return new CFWL_PictureBox;
 }
 
 FWL_Error CFWL_PictureBox::Initialize(
     const CFWL_WidgetProperties* pProperties) {
   if (m_pIface)
     return FWL_Error::Indefinite;
   if (pProperties) {
     *m_pProperties = *pProperties;
   }
   std::unique_ptr<IFWL_PictureBox> pPictureBox(IFWL_PictureBox::Create(
       m_pProperties->MakeWidgetImpProperties(&m_PictureBoxDP), nullptr));
   FWL_Error ret = pPictureBox->Initialize();
   if (ret != FWL_Error::Succeeded) {
     return ret;
   }
-  m_pIface = pPictureBox.release();
+  m_pIface = std::move(pPictureBox);
   CFWL_Widget::Initialize();
   return FWL_Error::Succeeded;
 }
 
 CFX_DIBitmap* CFWL_PictureBox::GetPicture() {
   return m_PictureBoxDP.m_pBitmap;
 }
 
 FWL_Error CFWL_PictureBox::SetPicture(CFX_DIBitmap* pBitmap) {
   m_PictureBoxDP.m_pBitmap = pBitmap;
   return FWL_Error::Succeeded;
 }
 
 FX_FLOAT CFWL_PictureBox::GetRotation() {
   return m_PictureBoxDP.m_fRotation;
 }
 
 FWL_Error CFWL_PictureBox::SetRotation(FX_FLOAT fRotation) {
   m_PictureBoxDP.m_fRotation = fRotation;
   return FWL_Error::Succeeded;
 }
 
 int32_t CFWL_PictureBox::GetFlipMode() {
-  return m_PictureBoxDP.GetFlipMode(m_pIface);
+  return m_PictureBoxDP.GetFlipMode(m_pIface.get());
 }
 
 FWL_Error CFWL_PictureBox::SetFlipMode(int32_t iFlipMode) {
   m_PictureBoxDP.m_iFlipMode = iFlipMode;
   return FWL_Error::Succeeded;
 }
 
 int32_t CFWL_PictureBox::GetOpacity() {
-  return m_PictureBoxDP.GetOpacity(m_pIface);
+  return m_PictureBoxDP.GetOpacity(m_pIface.get());
 }
 
 FWL_Error CFWL_PictureBox::SetOpacity(int32_t iOpacity) {
   m_PictureBoxDP.m_iOpacity = iOpacity;
   return FWL_Error::Succeeded;
 }
 
 FWL_Error CFWL_PictureBox::GetScale(FX_FLOAT& fScaleX, FX_FLOAT& fScaleY) {
   CFX_Matrix matrix;
-  m_PictureBoxDP.GetMatrix(m_pIface, matrix);
+  m_PictureBoxDP.GetMatrix(m_pIface.get(), matrix);
   matrix.Scale(fScaleX, fScaleY);
   return FWL_Error::Succeeded;
 }
 
 FWL_Error CFWL_PictureBox::SetScale(FX_FLOAT fScaleX, FX_FLOAT fScaleY) {
   m_PictureBoxDP.m_fScaleX = fScaleX;
   m_PictureBoxDP.m_fScaleY = fScaleY;
   return FWL_Error::Succeeded;
 }
 
 FWL_Error CFWL_PictureBox::GetOffset(FX_FLOAT& fx, FX_FLOAT& fy) {
   CFX_Matrix matrix;
-  m_PictureBoxDP.GetMatrix(m_pIface, matrix);
+  m_PictureBoxDP.GetMatrix(m_pIface.get(), matrix);
   fx = matrix.e;
   fy = matrix.f;
   return FWL_Error::Succeeded;
 }
 
 FWL_Error CFWL_PictureBox::SetOffset(FX_FLOAT fx, FX_FLOAT fy) {
   m_PictureBoxDP.m_fOffSetX = fx;
   m_PictureBoxDP.m_fOffSetY = fy;
   return FWL_Error::Succeeded;
 }
@@ skipping 48 matching lines @@
   matrix.Rotate(m_fRotation);
   matrix.Translate(fLen, fWid);
   matrix.Scale(m_fScaleX, m_fScaleY);
   matrix.Translate(m_fOffSetX, m_fOffSetY);
   return FWL_Error::Succeeded;
 }
 
 int32_t CFWL_PictureBox::CFWL_PictureBoxDP::GetFlipMode(IFWL_Widget* pWidget) {
   return m_iFlipMode;
 }