• Jon Turney's avatar
    hw/xwin: Add an option to use alpha channel in multiwindow mode · 2afee831
    Jon Turney authored
    Add an option to turn on the use of the X window's alpha channel in
    multiwindow mode, i.e. this uses the X window's alpha channel for
    compositing into the native desktop.
    
    This works on W7/Vista (using DwmEnableBlurBehindWindow()), and Windows
    10 (using the undocumented SetWindowCompositionAttribute()), but not on
    Windows 8/8.1
    
    -compositewm must be enabled for this to be useful, as we only have a
    pixmap with an alpha channel for the X window in that case.  The
    framebuffer/root window doesn't have one (unless perhaps you are using
    the rootless extension, maybe...).
    
    v2:
    Update meson.build
    
    Future work:
    
    A window property to control use of alpha?
    Option to turn off blur on W7/Vista
    Implement _NET_WM_WINDOW_OPACITY
    2afee831
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