+#if wxUSE_PALETTE
+ HPALETTE oldPal = 0;
+#endif // wxUSE_PALETTE
+
+ // do we have AlphaBlend() and company in the headers?
+#ifdef AC_SRC_OVER
+ if ( bmp.HasAlpha() )
+ {
+ // yes, now try to see if we have it during run-time
+
+ typedef BOOL (WINAPI *AlphaBlend_t)(HDC,int,int,int,int,
+ HDC,int,int,int,int,
+ BLENDFUNCTION);
+
+ // bitmaps can be drawn only from GUI thread so there is no need to
+ // protect this static variable from multiple threads
+ static bool s_triedToLoad = FALSE;
+ static AlphaBlend_t pfnAlphaBlend = NULL;
+ if ( !s_triedToLoad )
+ {
+ s_triedToLoad = TRUE;
+
+ // don't give errors about the DLL being unavailable, we're
+ // prepared to handle this
+ wxLogNull nolog;
+
+ wxDynamicLibrary dll(_T("msimg32.dll"));
+ if ( dll.IsLoaded() )
+ {
+ pfnAlphaBlend = (AlphaBlend_t)dll.GetSymbol(_T("AlphaBlend"));
+ if ( pfnAlphaBlend )
+ {
+ // we must keep the DLL loaded if we want to be able to
+ // call AlphaBlend() so just never unload it at all, not a
+ // big deal
+ dll.Detach();
+ }
+ }
+ }
+
+ if ( pfnAlphaBlend )
+ {
+ MemoryHDC hdcMem;
+ SelectInHDC select(hdcMem, GetHbitmapOf(bmp));
+
+ BLENDFUNCTION bf;
+ bf.BlendOp = AC_SRC_OVER;
+ bf.BlendFlags = 0;
+ bf.SourceConstantAlpha = 0xff;
+ bf.AlphaFormat = AC_SRC_ALPHA;
+
+ if ( pfnAlphaBlend(GetHdc(), x, y, width, height,
+ hdcMem, 0, 0, width, height,
+ bf) )
+ {
+ // skip wxAlphaBlend() call below
+ return;
+ }
+
+ wxLogLastError(_T("AlphaBlend"));
+ }
+
+ // use our own (probably much slower) implementation
+#ifdef wxHAVE_RAW_BITMAP
+ wxAlphaBlend(*this, x, y, width, height, bmp);
+#endif // wxHAVE_RAW_BITMAP
+
+ return;
+ }
+#endif // defined(AC_SRC_OVER)
+
projects / wxWidgets.git / blobdiff