[cairo] [PATCH] fix a crash caused by finished SVG surface

[Kouhei Sutou]

Hi,

I attach a patch that fix a crash that is caused by finished
SVG surface. "cairo_create (finished_svg_surface)" is invalid
usage but it will be better that reporting an error instead
of crash.

Here is a program that reproduces this case:

#include <cairo.h>
#include <cairo-svg.h>

int
main(int argc, char **argv)
{
  cairo_t *cr;
  cairo_surface_t *finished_surface;

  finished_surface = cairo_svg_surface_create ("/tmp/xxx.svg", 1.0, 1.0);
  cairo_surface_finish (finished_surface);

  cr = cairo_create (finished_surface);
  cairo_destroy (cr);

  cairo_surface_destroy (finished_surface);

  return 0;
}

We can use other paginated surface such as PDF surface for
finished surface.


This case is reported at rcairo's issue:
https://github.com/rcairo/rcairo/issues/15


Thanks,
--
kou
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