Cairo, Xlib, and the Shared Memory Extension › Eric Butler’s WeblogUpdate: As mentioned in a comment, XShm isn’t always available, for any number of reasons (most usually a remote X server). In this case the program would fall back to the normal method of images. This is why I choose to implement the XShm as a separate surface. The surface creation will fail if XShm isn’t available, so the application can fallback to a more suitable surface. (And yes, the fact t
