oedipus <[EMAIL PROTECTED]> writes: > I am creating a pixelbuffer with Gdk::Pixbuf::create(...) an empty > pixelbuffer and put in the pixelvalues later in some loops and than load up > the created image in a Gtk::Image. So far it works fine, but when I want to > write new data into the very same pixelbuffer my program crashes with a > segmentation fault. I tried already the valgrind but couldn't realy get > anything helpfull out of it. I append in the end the debug messages.
I didn't look closely at your code, but have you double-checked that you are not writing outside the valid pixel data area? That could cause memory corruption, and memory corruption generally results in weird, illogical behaviour. BTW I have a couple of small helper classes for reading/writing pixels in a pixbuf to make this simpler. It's as fast as doing the stuff by hand. You can get it here: http://people.iola.dk/olau/misc/pixbuf-drawing.hpp With it you can write PixelPosition p = get_position(pixbuf, x, y); p.left(3); // move 3 pixels left p.up(); // move up 1 pixel p.pixel().red() = 132; // change pixel's red channel There is also an iterator class for stuff like // set red channel in entire pixbuf for (PixelIterator i = begin(pixbuf), end = end(pixbuf); i != end; ++i) i->red() = 132; -- Ole Laursen http://people.iola.dk/olau/ _______________________________________________ gtkmm-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gtkmm-list
