move ToolboxButtonColorUpdater bitmap update to VirtualDevice

to avoid doing a read-modify-write cycle on the item images on the
toolbar, add an overlay image member to Toolbox items.

part of the process of making Bitmap an internal detail of vcl/

Change-Id: Ie4a886c48484a06694fc4c066ee0845b39d27f0b
Reviewed-on: https://gerrit.libreoffice.org/49649
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/vcl/inc/toolbox.h b/vcl/inc/toolbox.h
index f908cc5bdf52..9d928ce6a1ba 100644
--- a/vcl/inc/toolbox.h
+++ b/vcl/inc/toolbox.h
@@ -37,6 +37,7 @@ struct ImplToolItem
     VclPtr<vcl::Window> mpWindow; //don't dispose mpWindow - we get copied around
     void*               mpUserData;
     Image               maImage;
+    Image               maOverlayImage;
     long                mnImageAngle;
     bool                mbMirrorMode;
     OUString            maText;