Fixed inverse masking on MSW imagelist

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4331 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/msw/imaglist.cpp b/src/msw/imaglist.cpp
index 540c176058af316a8a13c4a4bd0f7fb3c1a6a159..6c80416dd82f9162f1a21edffcfc5b906ba2eb58 100644 (file)
--- a/src/msw/imaglist.cpp
+++ b/src/msw/imaglist.cpp
@@ -91,13 +91,36 @@ int wxImageList::Add(const wxBitmap& bitmap, const wxBitmap& mask)
        HBITMAP hBitmap2 = 0;
        if ( mask.Ok() )
            hBitmap2 = (HBITMAP) mask.GetHBITMAP();
+    else if (bitmap.GetMask())
+        hBitmap2 = (HBITMAP) bitmap.GetMask()->GetMaskBitmap();
+
+    HBITMAP hBitmapI=0;
+    if(hBitmap2!=0) {
+        // Microsoft imagelist masks are inverted from wxWindows mask standard (white is mask color)
+        BITMAP bm;
+        ::GetObject(hBitmap2,sizeof(BITMAP),(LPVOID)&bm);
+        int w=bm.bmWidth;
+        int h=bm.bmHeight;
+        HDC hdc = ::CreateCompatibleDC(NULL);   
+        HDC hdci = ::CreateCompatibleDC(NULL);  
+        hBitmapI = ::CreateCompatibleBitmap(hdci, w, h);
+        ::SelectObject(hdc, hBitmap2);
+        ::SelectObject(hdci, hBitmapI);
+        ::BitBlt(hdci, 0, 0, w, h, hdc, 0, 0, NOTSRCCOPY);
+        ::DeleteDC(hdc);
+        ::DeleteDC(hdci);
+    }
 
-    int index = ImageList_Add((HIMAGELIST) GetHIMAGELIST(), hBitmap1, hBitmap2);
+    int index = ImageList_Add((HIMAGELIST) GetHIMAGELIST(), hBitmap1, hBitmapI);
        if ( index == -1 )
     {
         wxLogError(_("Couldn't add an image to the image list."));
     }
 
+    // Clean up inverted mask
+    if(hBitmapI!=0)
+        ::DeleteObject(hBitmapI);
+
     return index;
 }