Pango Warning: Error loading GDEF table 4097

[Rabia Sirhindi <rabia sirhindi nu edu pk>]

	  Hi,

I have been using Pango (version 1.19.* ) for a couple of
weeks for Arabic text rendering. Currently I am getting this warning
with a simple program and am unable to find its cause. 

(process:4826): Pango-WARNING **: Error loading GDEF table 4097

The font is Nafees Nastaleeq; I am just trying to write some Urdu text to a PNG file. Here's the code,


        #include <pango/pangocairo.h>

        #define FONT "Nafees Nastaleeq , Normal 32"
        //#define FONT "Sans, Normal 26"

        int main (int argc, char *argv[]){

        PangoFontMap *fontmap;
        PangoContext *context;

        PangoLayout *layout;
        PangoFontDescription *font_desc;

        const char * text = "Arabic: \330\247\331\204\330\263\331\204\330\271\331\204\331\212\331\203\331\205\n";

        const char * text3 = "Arabic:

نستعلیق\n";

        cairo_surface_t  *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,300,300);

        cairo_t *cr = cairo_create (surface);
        cairo_set_source_rgb (cr,0.0,0.0,0.0);

        font_desc = pango_font_description_from_string(FONT);

        //fontmap = pango_cairo_font_map_get_default();

        //context = pango_cairo_font_map_create_context((PangoCairoFontMap *)fontmap);

        layout = pango_cairo_create_layout(cr);

        pango_layout_set_text (layout, text3, -1);
        pango_layout_set_font_description (layout, font_desc);

        pango_font_description_free(font_desc);

        pango_cairo_show_layout(cr,layout);

        cairo_surface_write_to_png (surface, "Arabic_text_with_Nafees_Nastaleeq.png");

       
        return 0;

        }

Is this a font-config error? Also, the warning disappears when the font-description is
built with Sansas font-family; but then the output is a space-separated
sequence of characters. With Nafees Nastaleeq also, the output text
does not seem to be positioned correctly. PNG file for both are
attached. 

Another little query is regarding Harfbuzz. Does PangoLayout
automatically uses Harfbuzz library when compiled or do we need to do
some extra work? I was wondering if Pango uses Harfbuzz functions for
opentype fonts like the one I mentioned.

Please bear with this basic stuff, but I really need to work this out.

Any help would be much appreciated. 

Thanks

-- 

Rabia

-- 
Regards,
Rabia

Attachment: Arabic_text_with_Nafees_Nastaleeq.png
Description: PNG image

Attachment: Arabic_text_with_Sans.png
Description: PNG image