[cairo] make return buffers more obvious

Enrico Weigelt, metux IT consult enrico.weigelt at gr13.net
Thu Dec 17 16:44:53 PST 2015

Hi folks,

when reading the code, it's not entirely obvious, which variables
passed structs are touched (or filled) by some function.

Is there anyhing we could do to make it easier to recognize ?
Maybe some naming convention ?


Enrico Weigelt,
metux IT consulting

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