Transparent windows

Vincent Povirk madewokherd at
Mon Nov 1 19:12:38 CDT 2010

It is probably a layered window, in which case the following functions
in user32 are relevant: SetLayeredWindowAttributes,
GetLayeredWindowAttributes, UpdateLayeredWindowIndirect, and

Most of user32 is implemented based on gdi32, wineserver, and
winex11.drv. When you see USER_Driver in user32, that indicates a
function in winex11.drv. So USER_Driver->pSetLayeredWindowAttributes
is really X11DRV_SetLayeredWindowAttributes.

Wine requires a compositing window manager to implement layered
windows properly. It does not matter whether the window manager
provides any 3D effects or uses opengl.

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