Re: What is the closure in stream output to file based surfaces for?
Bill Spitzak <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
Though it could be something more complicated, usually the closure is an
object in C++. This allows the same callback to be used for multiple
instances:
cairo_status_t write_func(void* closure, const unsigned char* data,
unsigned len)
{
((MyOutputClass*)closure)->write(data, len);
}
...
MyOutputClass x;
cairo_surface_write_to_png_stream (surface, write_func, (void*)(&x));
...
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