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Currently the switchSurface method takes a DisplaySurface. We want to change our DisplayChangeListener's dpy_gfx_switch callback to do this work asynchronously on a different thread. The caller of the switch callback will free the old DisplaySurface immediately the callback returns, so to ensure that the other thread doesn't access freed data we need to switch to using the underlying pixman image instead. The pixman image is reference counted, so we will be able to take a reference to it to avoid it vanishing too early. In this commit we only change the switchSurface method to take a pixman image, and keep the flow of control synchronous for now. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu> Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com> Tested-by: Roman Bolshakov <r.bolshakov@yadro.com> Message-id: 20190225102433.22401-3-peter.maydell@linaro.org Message-id: 20190214102816.3393-3-peter.maydell@linaro.org