Behdad Esfahbod ha scritto:
> It shouldn't. Can you attach a simple test program showing this?
My program is written in Delphi (pascal) and uses a wrapper to
libcairo-2.dll (1.2.6 version)
Anyway I don't think the problem is in the wrapper cause it
works in many cases.
I've extracted the list of cairo calls that throw
an exception ("invalid floating point operation")
cairo_surface = cairo_win32_surface_create
(<handle to a windows bitmap surface>);
cr = cairo_create (cairo_surface);
cairo_scale (cr, 600, 600);
cairo_set_source_rgba (cr, 1, 1, 1, 1);
cairo_paint (cr);
// ELLIPSE n.1
cairo_save (cr);
cairo_translate (cr, 0.5, 0.31);
cairo_scale (cr, 1, 0.77);
cairo_arc (cr, 0, 0, 0.80, 0, M_PI*2);
cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 1, 0);
cairo_fill_preserve (cr); // <------- THIS LINE WORKS CORRECTLY
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 0.003);
cairo_set_dash (cr, NULL, 0, 0);
cairo_stroke (cr);
// ELLIPSE n.2
cairo_save (cr);
cairo_translate (cr, 0.5 , 0.31);
cairo_scale (cr, 1, 0.77);
cairo_arc (cr, 0, 0, 0.90, 0, M_PI*2);
cairo_restore (cr);
cairo_set_source_rgb (cr, 1, 1, 0);
cairo_fill_preserve (cr); // <------- THIS LINE THROWS AN EXCEPTION
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 0.003);
cairo_set_dash (cr, NULL, 0, 0);
cairo_stroke (cr);
cairo_destroy (cr);
As you can see the operations made in ELLIPSE n.1 and the ones made in
ELLIPSE n.2 differs only for the third parameter of cairo_arc function
(0.80 --> 0.90)
Can someone try it?
Thanks in advance,
Enzo.
--
Enzo Ferrari
Sviluppo Software Didattico
Coop. Anastasis - Bologna
http://www.anastasis.it