[cairo] Assertion failed in sample code

Nis Martensen nis.martensen at web.de
Thu Mar 17 15:15:07 PDT 2011

Am 26.02.2011 09:57, schrieb Nis Martensen:
> The code used to generate the samples on the operator page,
> http://cgit.freedesktop.org/cairo-www/tree/src/operators/ops.c
> does not work any more, but hits an assertion.

Reduced to this sample program:
#include <cairo.h>
#include <cairo-svg.h>

int main (int argc, char *argv[])
        cairo_surface_t *surface;
        cairo_t *cr;

        surface = cairo_svg_surface_create ("foo.svg", 160, 120);
        cr = cairo_create (surface);

        cairo_rectangle (cr, 0, 0, 120, 90);
        cairo_fill (cr);

        cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);

        cairo_rectangle (cr, 40, 30, 120, 90);
        cairo_fill (cr);

        cairo_destroy (cr);
        cairo_surface_write_to_png (surface, "foo.png");
        cairo_surface_destroy (surface);

        return 0;

The result is:
cairo-surface.c:178: _cairo_surface_set_error: Assertion `status <

The status value that makes it fail is CAIRO_INT_STATUS_IMAGE_FALLBACK.

The png file is successfully created, but the svg file es empty (zero

While https://bugs.freedesktop.org/show_bug.cgi?id=34810 was closed, it
looks like the basic problem is still there and Benjamin's comment still


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