WinAPI: draw RGBA image

Question

I know there are a lot of answers related with this question, but I read them all and still don't understand.

My target is to draw RGBA image on the top of all windows using WinAPI.

For this I make TOPMOST LAYERED TRANSPARENT window:

    hWin = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TRANSPARENT,
                          "WindowClass1",
                          "Title",
                          WS_POPUP,
                          posX,
                          posY,
                          width,
                          height,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

To load image from file I use stb_image.h.

And to draw the image I tried different functions, right now it is:

    SetDIBitsToDevice(hdc,
                      0,
                      0,
                      width,
                      height,
                      0,
                      0,
                      0,
                      height,
                      pixels.data(),
                      &bmi,
                      DIB_RGB_COLORS);

Everything is draws, but without the alpha channel, I can only set the alpha for the whole window using:

    SetLayeredWindowAttributes(hWin, RGB(200, 200, 200), /*alpha=*/255, LWA_ALPHA);

And also I tried: UpdateLayeredWindow()

Is it possible at all?