`XBuf`-related segfaults

[GoogleCodeExporter]

Functions like `gui_getpixel` index into `XBuf`, but `XBuf` is never assigned. 
I don't see how it could work.

To get screenshots to work, I used `machine->video().save_snapshot(...)`. 
Specifics in attached file.

Original issue reported on code.google.com by [email protected] on 21 Aug 2014 at 7:59

Attachments:

• screenshot.txt