create "disabled" image (icon) only if the original changes

Currently we create a "disabled" version of  bitmaps in "Image"
class (used for toolbar icons for example) in every draw call.
This is not really optimal. The solution is to calculate the
checksum of the original and create a "disabled" version only if
the checksum changes.

Change-Id: I6ed2d08c64fee028b479fedb35e4384f112e98e2

1 files changed, 2 insertions, 0 deletions

diff --git a/vcl/inc/image.h b/vcl/inc/image.h
index 5b8e92d6bee2..00861670abba 100644
--- a/vcl/inc/image.h
+++ b/vcl/inc/image.h
@@ -39,6 +39,8 @@ public:
 private:
 
     BitmapEx    maBmpEx;
+    BitmapChecksum maBitmapChecksum;
+
     BitmapEx    maDisabledBmpEx;
     BitmapEx*   mpDisplayBmp;
     Size        maSize;