Re: [matplotlib-devel] [PATCH] gtkagg backend leaks gc's.

[Carl M. <mi...@ph...>]

Hello,

I noticed that a program I had that uses canvas.blit() to do animated graphs 
with the gtkagg backend was leaking memory.

I tracked this down to gtk gc's being allocated in agg_to_gtk_drawable with 
gdk_gc_new(), but never being destroyed.

The leak can be seen using the 'Animating selected plot elements' example 
from:

http://www.scipy.org/Cookbook/Matplotlib/Animations

(if it is modified to run forever, rather than just 50 plots and also 
changing numerix to numpy). After a few minutes, it is clear from ps that the 
memory usage is slowly but steadily climbing.

Patch below (against matplotlib-1.1.1.) fixes it.

Carl

--- _gtkagg.cpp~        2012-06-30 12:37:00.000000000 -0700
+++ _gtkagg.cpp 2012-11-08 14:30:23.000000000 -0800
@@ -121,6 +121,7 @@
                                  destbuffer,
                                  deststride);

+       gdk_gc_destroy(gc);
            if (needfree)
            {
                delete [] destbuffer;