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pixel format for overlay using alpha

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Hi to everyone, I need to build a foreground overlay with directdraw using a pixel format managing alpha channel in order to have different alpha value around the screen (I need to do a blending). I am newbie with directdraw and I'm using some example code managing overlay but I cannot understand what is the right pixel format I need and how can I force its use. For example I tried (whithout success) those statements: DDPIXELFORMAT formats = {sizeof(DDPIXELFORMAT), DDPF_ALPHA, 0, 8, 0xF800, 0x07e0, 0x001F, 0}; DDSURFACEDESC2 ddsdOverlay; memset(&ddsdOverlay, 0, sizeof(ddsdOverlay)); ddsdOverlay.dwSize = sizeof(ddsdOverlay); ddsdOverlay.ddsCaps.dwCaps = DDSCAPS_OVERLAY | DDSCAPS_FLIP | DSCAPS_COMPLEX | DDSCAPS_VIDEOMEMORY; ddsdOverlay.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_BACKBUFFERCOUNT | DDSD_PIXELFORMAT; ddsdOverlay.dwWidth = IMG_W; ddsdOverlay.dwHeight = IMG_H; ddsdOverlay.dwBackBufferCount = 1; HRESULT hr; ddsdOverlay.ddpfPixelFormat = formats[n]; hr = ddraw->CreateSurface(&ddsdOverlay, &overlay, 0); Can you help me? Thank you in advance. dp

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