winapi - SetLayeredWindowAttributes to make CEF transparent not working on Windows XP -


i use setlayeredwindowattributes lwa_colorkey replace color (#ff00ff) transparency, in order achieve transparent background in cef1 example.

it works on 7/vista.
on windows xp, function succeeds, color remains opaque.

my code create main window:

bool initinstance(hinstance hinstance, int ncmdshow) {   hwnd hwnd;   hinst = hinstance;   hwnd = createwindowex(ws_ex_layered | ws_ex_topmost | ws_ex_composited, szwindowclass, sztitle,                  ws_overlappedwindow | ws_clipchildren | ws_visible, cw_usedefault, 0,                  cw_usedefault, 0, null, null, hinstance, null);

wndproc main window:

switch (message) { case wm_create: {   ...   info.settransparentpainting(true);   info.setaschild(hwnd, rect);    // create new child browser window   cefbrowser::createbrowser(info,       static_cast<cefrefptr<cefclient> >(g_handler),       url_to_pagewithmagentabackground, settings);    setlayeredwindowattributes(hwnd, rgb(0xff, 0x00, 0xff), 0xff, lwa_colorkey);

html displayed:

<style type="text/css">html { background: #ff00ff; }</style>

note these points:

  • it work on xp lwa_alpha (makes whole window semi-transparent), not lwa_colorkey

  • when connect xp through remote desktop, see transparency expected!

can explain please?


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