Re: FT_New_Face called many time for same font.

[Behdad Esfahbod <behdad behdad org>]

First, try with pango 1.26.0.  Second, which backend are you using?  I assume 
pangoft2.  That's not really supported.  We recommend using pangocairo only.

behdad

On 10/06/2009 05:12 AM, Jesper L. Nielsen wrote:
> 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
>
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