ctrl.natt = NATIVE_ATTACHMENT_BACK_LEFT;
ctrl.preserve = (gsurf->base.SwapBehavior == EGL_BUFFER_PRESERVED);
ctrl.swap_interval = gsurf->base.SwapInterval;
+ ctrl.premultiplied_alpha = (gsurf->base.VGAlphaFormat == EGL_VG_ALPHA_FORMAT_PRE);
return gsurf->native->present(gsurf->native, &ctrl);
}