- /* GRG: black out the transparent area to preserve background
- * colour, because Windows blits the original bitmap using
- * SRCINVERT (XOR) after applying the mask to the dest rect.
- */
- HDC dcSrc = ::CreateCompatibleDC(NULL);
- HDC dcDst = ::CreateCompatibleDC(NULL);
- SelectObject(dcSrc, (HBITMAP)mask->GetMaskBitmap());
- SelectObject(dcDst, iconInfo.hbmColor);
-
- BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(), dcSrc, 0, 0, SRCAND);
-
- SelectObject(dcDst, NULL);
- SelectObject(dcSrc, NULL);
- DeleteDC(dcDst);
- DeleteDC(dcSrc);
+ // black out the transparent area to preserve background colour, because
+ // Windows blits the original bitmap using SRCINVERT (XOR) after applying
+ // the mask to the dest rect.
+ {
+ MemoryHDC dcSrc, dcDst;
+ SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
+ selectBitmap(dcDst, iconInfo.hbmColor);
+
+ if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
+ dcSrc, 0, 0, SRCAND) )
+ {
+ wxLogLastError(_T("BitBlt"));
+ }
+ }