[ft] Cache manager/glyph copy memory leak problem

[Ric Flinn]

Hello,



Can somebody help me with a memory leak issue that I'm having when I use 
FTC_ImageCache_Lookup() and FT_Glyph_Copy()?



I'm using FT_Glyph caching, which by itself is working fine for me. In certain 
cases I need to perform a transform operation on a glyph, so I'm using 
FT_Glyph_Copy() to get a copy of the glyph to transform. In these cases, I see 
memory leaks; I have enabled FT2_DEBUG_MEMORY and it confirms that I'm leaking 
memory.



Here's the relevant parts of the code:





    font_type.face_id = (FTC_FaceID)face_id;

    font_type.width   = (short) typeface->scale.width;

    font_type.height  = (short) typeface->scale.height;

    font_type.flags   = FT_LOAD_DEFAULT;



    ft_error = FTC_ImageCache_Lookup(

                                      imagecache,

                                      &font_type,

                                      glyph_index,

                                      &ftc_glyph,

                                      NULL

                                    );



    glyph_ptr = &ftc_glyph;



    if (transform)

    {

        FT_Glyph        tmp_glyph;



        ft_error = FT_Glyph_Copy(ftc_glyph, &tmp_glyph);



        (void)FT_Glyph_Transform(tmp_glyph, &ft_matrix, NULL);



        glyph_ptr = &tmp_glyph;

    }





    /* Convert the glyph to a bitmap */



    ft_error = FT_Glyph_To_Bitmap(glyph_ptr, FT_RENDER_MODE_NORMAL, NULL, 0);



    /* Draw the bitmap, etc.

       ...

     */





    /* Release the bitmap */



    FT_Done_Glyph(*glyph_ptr);





If "transform" is false, no memory problem occurs, but if it is true, the code 
loses some memory. I'm using version 2.3.5, and I've tried this on both Linux 
and Windows. Here's the leak info from the memory debugger, from drawing a 
single transformed glyph:



leaked memory block at address 02AE0818, size        4 in 
(c:\freetype-2.3.5\src\base\ftoutln.c:271)

leaked memory block at address 02ADCB78, size       40 in 
(..\..\..\src\base\ftglyph.c:355)

leaked memory block at address 02ADAED0, size      160 in 
(c:\freetype-2.3.5\src\base\ftoutln.c:269)

leaked memory block at address 02ADAFE8, size       10 in 
(c:\freetype-2.3.5\src\base\ftoutln.c:270)

FreeType: total memory allocations = 1559203

FreeType: maximum memory footprint = 308981

FreeType.Debug: FreeType: 214 bytes of memory leaked in 4 blocks



Any help would be much appreciated.

- Ric











      
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