diff --git a/LEGO1/mxbitmap.cpp b/LEGO1/mxbitmap.cpp
index 6ad26f94..d7185c71 100644
--- a/LEGO1/mxbitmap.cpp
+++ b/LEGO1/mxbitmap.cpp
@@ -122,8 +122,14 @@ int MxBitmap::vtable3c(MxBool)
   return 0;
 }
 
-// OFFSET: LEGO1 0x100bd3e0 STUB
-int MxBitmap::vtable40(HDC p_hdc, int p_xSrc, int p_ySrc, int p_xDest, int p_yDest, int p_destWidth, int p_destHeight)
+// OFFSET: LEGO1 0x100bd3e0
+MxResult MxBitmap::CopyColorData(HDC p_hdc, int p_xSrc, int p_ySrc, int p_xDest, int p_yDest, int p_destWidth, int p_destHeight)
 {
-  return 0;
+  // Compression fix?
+  if ((this->m_bmiHeader->biCompression != 16) && (0 < this->m_bmiHeader->biHeight)) {
+    p_ySrc = (this->m_bmiHeader->biHeight - p_destHeight) - p_ySrc;
+  }
+  // TODO: 0xcc0020 is probably a common raster code variable
+  // see https://learn.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-bitblt#parameters
+  return StretchDIBits(p_hdc, p_xDest, p_yDest, p_destWidth, p_destHeight, p_xSrc, p_ySrc, p_destWidth, p_destHeight, this->m_data, this->m_info, this->m_unk18, 0xcc0020);
 }
\ No newline at end of file
diff --git a/LEGO1/mxbitmap.h b/LEGO1/mxbitmap.h
index 66550f7e..b6886d51 100644
--- a/LEGO1/mxbitmap.h
+++ b/LEGO1/mxbitmap.h
@@ -24,7 +24,7 @@ class MxBitmap : public MxCore
   __declspec(dllexport) virtual MxPalette *CreatePalette(); // vtable+34
   virtual void vtable38(void*);
   virtual int vtable3c(MxBool);
-  virtual int vtable40(HDC p_hdc, int p_xSrc, int p_ySrc, int p_xDest, int p_yDest, int p_destWidth, int p_destHeight);
+  virtual MxResult MxBitmap::CopyColorData(HDC p_hdc, int p_xSrc, int p_ySrc, int p_xDest, int p_yDest, int p_destWidth, int p_destHeight); // vtable+40
 
 private:
   BITMAPINFO *m_info;