make AlphaMask constructors explicit

to reduce surprises in some changes I'm planning

Change-Id: I61cb58d51ab77f57e55159017c7bece5bd99953f
Reviewed-on: https://gerrit.libreoffice.org/54161
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/vcl/alpha.hxx b/include/vcl/alpha.hxx
index 1f7876b23d58..a36e4b6b0bfd 100644
--- a/include/vcl/alpha.hxx
+++ b/include/vcl/alpha.hxx
@@ -34,10 +34,10 @@ class VCL_DLLPUBLIC AlphaMask : private Bitmap
 public:
 
                 AlphaMask();
-                AlphaMask( const Bitmap& rBitmap );
+    explicit    AlphaMask( const Bitmap& rBitmap );
                 AlphaMask( const AlphaMask& rAlphaMask );
                 AlphaMask( AlphaMask&& rAlphaMask );
-                AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency = nullptr );
+    explicit    AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency = nullptr );
     virtual     ~AlphaMask() override;
 
     AlphaMask&  operator=( const Bitmap& rBitmap );