diff --git a/fpdfsdk/include/pdfwindow/PWL_Utils.h b/fpdfsdk/include/pdfwindow/PWL_Utils.h
index 56f7a27..ef87ea3 100644
--- a/fpdfsdk/include/pdfwindow/PWL_Utils.h
+++ b/fpdfsdk/include/pdfwindow/PWL_Utils.h
@@ -220,7 +220,6 @@
                          const CPWL_Color& crLeftTop,
                          const CPWL_Color& crRightBottom,
                          int32_t nStyle,
-                         const CPWL_Dash& dash,
                          int32_t nTransparancy);
   static void DrawFillArea(CFX_RenderDevice* pDevice,
                            CFX_Matrix* pUser2Device,
diff --git a/fpdfsdk/include/pdfwindow/PWL_Wnd.h b/fpdfsdk/include/pdfwindow/PWL_Wnd.h
index 0ea48b5..4f59fc3 100644
--- a/fpdfsdk/include/pdfwindow/PWL_Wnd.h
+++ b/fpdfsdk/include/pdfwindow/PWL_Wnd.h
@@ -294,7 +294,6 @@
   void Move(const CPDF_Rect& rcNew, FX_BOOL bReset, FX_BOOL bRefresh);
   virtual void InvalidateRect(CPDF_Rect* pRect = NULL);
 
-  void GetAppearanceStream(CFX_ByteString& sAppStream);
   void DrawAppearance(CFX_RenderDevice* pDevice, CFX_Matrix* pUser2Device);
 
   virtual FX_BOOL OnKeyDown(FX_WORD nChar, FX_DWORD nFlag);
@@ -341,27 +340,21 @@
   virtual void SetFontSize(FX_FLOAT fFontSize);
 
   void SetBackgroundColor(const CPWL_Color& color);
-  void SetBorderColor(const CPWL_Color& color);
-  void SetBorderWidth(int32_t nBorderWidth);
   void SetClipRect(const CPDF_Rect& rect);
   void SetBorderStyle(int32_t eBorderStyle);
-  void SetBorderDash(const CPWL_Dash& sDash);
 
-  CPDF_Rect GetOriginWindowRect() const;
   virtual CPDF_Rect GetWindowRect() const;
   virtual CPDF_Rect GetClientRect() const;
   CPDF_Point GetCenterPoint() const;
-  CPDF_Rect GetClientCenterSquare() const;
-  CPDF_Rect GetWindowCenterSquare() const;
   int32_t GetBorderWidth() const;
   FX_BOOL IsVisible() const { return m_bVisible; }
   FX_BOOL HasFlag(FX_DWORD dwFlags) const;
   void AddFlag(FX_DWORD dwFlags);
   void RemoveFlag(FX_DWORD dwFlags);
-  CPDF_Rect GetClipRect() const;
+  const CPDF_Rect& GetClipRect() const;
   CPWL_Wnd* GetParentWindow() const;
   int32_t GetBorderStyle() const;
-  CPWL_Dash GetBorderDash() const;
+  const CPWL_Dash& GetBorderDash() const;
   void* GetAttachedData() const;
 
   FX_BOOL WndHitTest(const CPDF_Point& point) const;
@@ -427,7 +420,7 @@
   void SetNotifyFlag(FX_BOOL bNotifying = TRUE) { m_bNotifying = bNotifying; }
 
   FX_BOOL IsValid() const;
-  PWL_CREATEPARAM GetCreationParam() const;
+  const PWL_CREATEPARAM& GetCreationParam() const;
   FX_BOOL IsNotifying() const { return m_bNotifying; }
 
   void InvalidateRectMove(const CPDF_Rect& rcOld, const CPDF_Rect& rcNew);
diff --git a/fpdfsdk/src/pdfwindow/PWL_Utils.cpp b/fpdfsdk/src/pdfwindow/PWL_Utils.cpp
index 2c9ec99..3b0f3be 100644
--- a/fpdfsdk/src/pdfwindow/PWL_Utils.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_Utils.cpp
@@ -1469,7 +1469,6 @@
                             const CPWL_Color& crLeftTop,
                             const CPWL_Color& crRightBottom,
                             int32_t nStyle,
-                            const CPWL_Dash& dash,
                             int32_t nTransparancy) {
   FX_FLOAT fLeft = rect.left;
   FX_FLOAT fRight = rect.right;
diff --git a/fpdfsdk/src/pdfwindow/PWL_Wnd.cpp b/fpdfsdk/src/pdfwindow/PWL_Wnd.cpp
index 5bedad1..d0aaa78 100644
--- a/fpdfsdk/src/pdfwindow/PWL_Wnd.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_Wnd.cpp
@@ -302,14 +302,6 @@
   InvalidateRect(&rcUnion);
 }
 
-void CPWL_Wnd::GetAppearanceStream(CFX_ByteString& sAppStream) {
-  if (IsValid()) {
-    CFX_ByteTextBuf sTextBuf;
-    GetAppearanceStream(sTextBuf);
-    sAppStream += sTextBuf.GetByteString();
-  }
-}
-
 void CPWL_Wnd::GetAppearanceStream(CFX_ByteTextBuf& sAppStream) {
   if (IsValid() && IsVisible()) {
     GetThisAppearanceStream(sAppStream);
@@ -366,11 +358,11 @@
     }
 
     if (HasFlag(PWS_BORDER))
-      CPWL_Utils::DrawBorder(
-          pDevice, pUser2Device, rectWnd, (FX_FLOAT)GetBorderWidth(),
-          GetBorderColor(), GetBorderLeftTopColor(GetBorderStyle()),
-          GetBorderRightBottomColor(GetBorderStyle()), GetBorderStyle(),
-          GetBorderDash(), GetTransparency());
+      CPWL_Utils::DrawBorder(pDevice, pUser2Device, rectWnd,
+                             (FX_FLOAT)GetBorderWidth(), GetBorderColor(),
+                             GetBorderLeftTopColor(GetBorderStyle()),
+                             GetBorderRightBottomColor(GetBorderStyle()),
+                             GetBorderStyle(), GetTransparency());
   }
 }
 
@@ -528,7 +520,7 @@
   return m_bCreated;
 }
 
-PWL_CREATEPARAM CPWL_Wnd::GetCreationParam() const {
+const PWL_CREATEPARAM& CPWL_Wnd::GetCreationParam() const {
   return m_sPrivateParam;
 }
 
@@ -536,10 +528,6 @@
   return m_sPrivateParam.pParentWnd;
 }
 
-CPDF_Rect CPWL_Wnd::GetOriginWindowRect() const {
-  return m_sPrivateParam.rcRectWnd;
-}
-
 CPDF_Rect CPWL_Wnd::GetWindowRect() const {
   return m_rcWindow;
 }
@@ -561,15 +549,6 @@
                     (rcClient.top + rcClient.bottom) * 0.5f);
 }
 
-CPDF_Rect CPWL_Wnd::GetClientCenterSquare() const {
-  return CPWL_Utils::GetCenterSquare(GetClientRect());
-}
-
-CPDF_Rect CPWL_Wnd::GetWindowCenterSquare() const {
-  return CPWL_Utils::GetCenterSquare(
-      CPWL_Utils::DeflateRect(GetWindowRect(), 0.1f));
-}
-
 FX_BOOL CPWL_Wnd::HasFlag(FX_DWORD dwFlags) const {
   return (m_sPrivateParam.dwFlags & dwFlags) != 0;
 }
@@ -626,11 +605,6 @@
   return 0;
 }
 
-void CPWL_Wnd::SetBorderWidth(int32_t nBorderWidth) {
-  if (HasFlag(PWS_BORDER))
-    m_sPrivateParam.dwBorderWidth = nBorderWidth;
-}
-
 CPWL_Color CPWL_Wnd::GetBorderColor() const {
   if (HasFlag(PWS_BORDER))
     return m_sPrivateParam.sBorderColor;
@@ -638,12 +612,7 @@
   return CPWL_Color();
 }
 
-void CPWL_Wnd::SetBorderColor(const CPWL_Color& color) {
-  if (HasFlag(PWS_BORDER))
-    m_sPrivateParam.sBorderColor = color;
-}
-
-CPWL_Dash CPWL_Wnd::GetBorderDash() const {
+const CPWL_Dash& CPWL_Wnd::GetBorderDash() const {
   return m_sPrivateParam.sDash;
 }
 
@@ -651,11 +620,6 @@
   return m_sPrivateParam.pAttachedData;
 }
 
-void CPWL_Wnd::SetBorderDash(const CPWL_Dash& sDash) {
-  if (HasFlag(PWS_BORDER))
-    m_sPrivateParam.sDash = sDash;
-}
-
 CPWL_ScrollBar* CPWL_Wnd::GetVScrollBar() const {
   if (HasFlag(PWS_VSCROLL))
     return m_pVScrollBar;
@@ -754,7 +718,7 @@
   m_rcClip.Normalize();
 }
 
-CPDF_Rect CPWL_Wnd::GetClipRect() const {
+const CPDF_Rect& CPWL_Wnd::GetClipRect() const {
   return m_rcClip;
 }