move transparency adjust code to BitmapEx

part of making Bitmap an internal implementation detail of vcl/

Change-Id: I6978d84c86c3d55b3ebbeacda60fd94b160daa29
Reviewed-on: https://gerrit.libreoffice.org/49667
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/vcl/bitmapex.hxx b/include/vcl/bitmapex.hxx
index 9faf3c8eb41c..ce45c0a6891f 100644
--- a/include/vcl/bitmapex.hxx
+++ b/include/vcl/bitmapex.hxx
@@ -441,6 +441,9 @@ public:
                             const Size &rSize );
 
     void                setAlphaFrom( sal_uInt8 cIndexFrom, sal_Int8 nAlphaTo );
+
+    void                AdjustTransparency( sal_uInt8 cTrans );
+
 public:
 
     SAL_DLLPRIVATE std::shared_ptr<ImpBitmap> const & ImplGetBitmapImpBitmap() const { return aBitmap.ImplGetImpBitmap(); }