[directfb-dev] Re: The correct way of using fonts?

[Denis Oliver Kropp]

Quoting Henric Andersson ([EMAIL PROTECTED]):
> I've made a program that uses TrueType fonts quite extensively. What I've noticed is 
>that the program is leaking memory. ALOT of memory. I traced it to the font loading.
> 
> Correct me if I'm wrong, but isn't this how it is supposed to be used:
> 
>       DFBFontDescription font_dsc;
>       IDirectFBFont *font = NULL;                     // Our font
> 
>       font_dsc.flags = DFDESC_HEIGHT;
>       font_dsc.height = 30;
>       DFBCHECK (dfb->CreateFont (dfb, "arial.ttf", &font_dsc, &font));
>       DFBCHECK (primary->SetFont (primary, font));
> 
>       *** do something with the font, ie, draw stuff on screen :) ***
> 
>       font->Release(font);
> 
> If you run this in a loop, the program will eventually fail to load the font, and 
>before it does, it will eat alot of memory.
> 
> Any comments are welcomed...

I wrote a small test app and it works perfectly.

-- 
Best regards,
  Denis Oliver Kropp

.------------------------------------------.
| DirectFB - Hardware accelerated graphics |
| http://www.directfb.org/                 |
"------------------------------------------"

                            Convergence GmbH

#include <pthread.h>

#include <directfb.h>

#define CHECK(x) \
{                                            \
     DFBResult ret = x;                      \
                                             \
     if (ret)                                \
          DirectFBErrorFatal (#x, ret);      \
}

int
main (int argc, char *argv[])
{
  int                    i, n;
  DFBResult              ret;
  IDirectFB             *dfb;
  IDirectFBSurface      *primary;
  DFBSurfaceDescription  desc;

  CHECK( DirectFBInit (&argc, &argv) );
  CHECK( DirectFBCreate (&dfb) );

  dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN);

  desc.flags = DSDESC_CAPS;
  desc.caps  = DSCAPS_PRIMARY;

  CHECK( dfb->CreateSurface (dfb, &desc, &primary) );

  primary->Clear (primary, 0, 0, 0, 0);

  primary->GetSize (primary, NULL, &n);
  n /= 2;

  sleep (1);

  for (i=4; i < n; i++)
    {
      DFBFontDescription  desc;
      IDirectFBFont      *font;

      desc.flags  = DFDESC_HEIGHT;
      desc.height = i;

      CHECK( dfb->CreateFont (dfb, FONT, &desc, &font) );

      CHECK( primary->SetFont (primary, font) );

      primary->SetColor (primary, i*256/n, i*256/n, i*256/n, 0xff);
      primary->DrawString (primary, "Hello World", -1, 0, i, DSTF_TOPLEFT);

      font->Release (font);
    }

  sleep (2);

  primary->Release (primary);
  dfb->Release (dfb);
     
  return 0;
}