[cairo] Implementing cairo_read_func_t/cairo_write_func_t properly

Lawrence D'Oliveiro ldo at geek-central.gen.nz
Mon Jan 4 12:41:57 PST 2016

On Sun, 3 Jan 2016 18:37:25 +0100, Enrico Weigelt, metux IT consult

> Yeah, but I wonder, what's the benefit of streaming here at all.

I should have thought it would be blindingly obvious why callbacks are
such a wonderful idea for code reuse: because they minimize assumptions
about the caller’s data structures.

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