diff --git a/core/fxge/cfx_renderdevice.cpp b/core/fxge/cfx_renderdevice.cpp
index 4009e98..e0025de 100644
--- a/core/fxge/cfx_renderdevice.cpp
+++ b/core/fxge/cfx_renderdevice.cpp
@@ -533,7 +533,11 @@
   return m_pDeviceDriver->GetDeviceCaps(caps_id);
 }
 
-RetainPtr<CFX_DIBitmap> CFX_RenderDevice::GetBitmap() const {
+RetainPtr<CFX_DIBitmap> CFX_RenderDevice::GetBitmap() {
+  return m_pBitmap;
+}
+
+RetainPtr<const CFX_DIBitmap> CFX_RenderDevice::GetBitmap() const {
   return m_pBitmap;
 }
 
diff --git a/core/fxge/cfx_renderdevice.h b/core/fxge/cfx_renderdevice.h
index 8295a06..fdc577d 100644
--- a/core/fxge/cfx_renderdevice.h
+++ b/core/fxge/cfx_renderdevice.h
@@ -62,7 +62,8 @@
   DeviceType GetDeviceType() const { return m_DeviceType; }
   int GetRenderCaps() const { return m_RenderCaps; }
   int GetDeviceCaps(int id) const;
-  RetainPtr<CFX_DIBitmap> GetBitmap() const;
+  RetainPtr<CFX_DIBitmap> GetBitmap();
+  RetainPtr<const CFX_DIBitmap> GetBitmap() const;
   [[nodiscard]] bool CreateCompatibleBitmap(const RetainPtr<CFX_DIBitmap>& pDIB,
                                             int width,
                                             int height) const;
diff --git a/xfa/fgas/graphics/cfgas_gegraphics.cpp b/xfa/fgas/graphics/cfgas_gegraphics.cpp
index 6f255d6..5b5da61 100644
--- a/xfa/fgas/graphics/cfgas_gegraphics.cpp
+++ b/xfa/fgas/graphics/cfgas_gegraphics.cpp
@@ -242,7 +242,7 @@
     const CFGAS_GEPath& path,
     const CFX_FillRenderOptions& fill_options,
     const CFX_Matrix& matrix) {
-  RetainPtr<CFX_DIBitmap> bitmap = m_renderDevice->GetBitmap();
+  RetainPtr<const CFX_DIBitmap> bitmap = m_renderDevice->GetBitmap();
   int32_t width = bitmap->GetWidth();
   int32_t height = bitmap->GetHeight();
   auto bmp = pdfium::MakeRetain<CFX_DIBitmap>();
@@ -281,7 +281,7 @@
     const CFGAS_GEPath& path,
     const CFX_FillRenderOptions& fill_options,
     const CFX_Matrix& matrix) {
-  RetainPtr<CFX_DIBitmap> bitmap = m_renderDevice->GetBitmap();
+  RetainPtr<const CFX_DIBitmap> bitmap = m_renderDevice->GetBitmap();
   int32_t width = bitmap->GetWidth();
   int32_t height = bitmap->GetHeight();
   float start_x = m_info.fillColor.GetShading()->GetBeginPoint().x;