tweak GetBitmap methods in BitmapEx

so we return a const& for the normal case, just like other methods,
which reduces copying.

This revealed that CreateDisplayBitmap in Bitmap can be const.

Change-Id: I9f9b9ff0c52d7e95eaae62af152218be8847dd63
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/86836
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/vcl/bitmap.hxx b/include/vcl/bitmap.hxx
index 329a40ec6ef1..2b97bded06d1 100644
--- a/include/vcl/bitmap.hxx
+++ b/include/vcl/bitmap.hxx
@@ -145,7 +145,7 @@ public:
 
     BitmapChecksum          GetChecksum() const;
 
-    Bitmap                  CreateDisplayBitmap( OutputDevice* pDisplay );
+    Bitmap                  CreateDisplayBitmap( OutputDevice* pDisplay ) const;
 
     static const BitmapPalette&
                             GetGreyPalette( int nEntries );