[rox-devel] Memory leak

[Thomas L. <ta...@ec...>]

I'm still trying to track down the memory leak when setting the pinboard
backdrop...

Can anyone see what's wrong with this code? It creates a new pixbuf image
and then, once a second, renders it as a pixmap and sets it as the
window's background image.

On my system (Debian/Unstable, XFree86 4.1) it will sit there not doing
much, but if you drag a window over it (to cause redrawing) then the X
server's memory starts to increase (about 1 Mb per second while dragging).
Stop dragging, and the memory stops increasing until you start again.

Quitting the program and starting it again, it continues eating memory
where it left off (ie, you don't get the memory back!).

Now:

- Have I missed something obvious?
- Does this happen for everyone, or is it just me?
- Why only when redrawing the window AND changing the backdrop (remove
  either and it works fine).
- Unreffing the pixmap after setting the style causes a segfault, so I
  take that as a hint that we shouldn't do that.


#include <gtk/gtk.h>

GdkPixbuf *pixbuf = NULL;

static gboolean set_background(GtkWidget *win)
{
	GtkStyle *style;
	GdkPixmap *pixmap;

	gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap, NULL, 0);

	style = gtk_style_new();
	style->bg_pixmap[GTK_STATE_NORMAL] = pixmap;
	gtk_widget_set_style(win, style);
	g_object_unref(style);

	return TRUE;
}

int main(int argc, char **argv)
{
	GtkWidget *win;

	gtk_init(&argc, &argv);

	pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, 800, 800);

	win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_widget_set_size_request(win,
				    gdk_pixbuf_get_width(pixbuf),
				    gdk_pixbuf_get_height(pixbuf));
	gtk_widget_show(win);

	g_timeout_add(1000, (GSourceFunc) set_background, win);

	gtk_main();

	return 0;
}


Puzzled, but possibly just need more sleep...


-- 
Thomas Leonard			http://rox.sourceforge.net
ta...@ec...		ta...@us...