[cairo] const-ness fixes for transform_distance and transform_point

[Keith Packard]

On Mon, 2005-05-09 at 13:06 -0400, Owen Taylor wrote:

> This does muddle the "plain structure returns are out-parameters"
> rule that I documented in the language binding appendix.

And what about the re-entrancy issues of returning a pointer to static
data?  The C library suffers greatly from this in a number of APIs.
Passing in a pointer to thread-specific data makes this all much
clearer.

> void
> cairo_get_matrix (cairo_t *cr, cairo_matrix_t *matrix);

I have a strange though here -- we could mark the cairo calls which do
not change the state of the library by annotating the cairo_t* with
'const'.  Would this be a good idea?  Or would it only clutter the
headers?  I'm not certain myself, but wanted to increase list traffic
with side discussions.

-keith

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