FT_New_Face called many time for same font.

["Jesper L. Nielsen" <jln locatel dk>]

Hi

I've been using Pango to render markup language, and one day when  
rendering a Chinese text (with a 8Mb font), I discovered that Pango  
seems to open the same font many times.

Upon startup of my application the font is opened 5 times, and later 4  
more times. The final output from the process' smap file is:

      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF
      8184 kb      620 kb        0 kb   /home/jln/git/eclipse/src/ 
juno/fonts/CODE2000.TTF

The font is acquired by calling pango_fc_font_lock_face, which then  
calls FT_New_Face. I assume the font in turn should be free by calling  
pango_fc_font_unlock_face, however this function doesn't do anything.

The proper call for unloading fonts "FT_Done_Face" is called by  
pango_ft2_font_finalize. However atleast my program doesn't seem to  
trigger this at any point.

The goal of course is to use as little memory as possible, so what is  
supposed to call pango_ft2_font_finalize?
Would other programs using Pango also open multiple instances of the  
same font?

I will keep on digging, but any pointers greatly appreciated.

I'm using Pango 1.20.5.

--
Jesper L. Nielsen
Senior Software Engineer @ 2M-Locatel