text extension problem

["Ricchetti, Andrea" <Andrea Ricchetti snapon com>]

Hi o all,

 

I’m a very new user in the “pango cairo world”

I’ve got a problem trying to get  the extension of a text usig Pango - Cairo.

I’ve made this function but the text of dimension returned is not correct, is small than the right (pixel) size.

 

void CPangoCairoWrapper::GetTextExtension(int *width, int *height)

{

            PangoAttribute *pa;

            PangoAttrList *pal;

 

            pal = pango_layout_get_attributes(m_pa_pLayout);

 

            if(!pal)

            {

                        pal = pango_attr_list_new();

                        pango_layout_set_attributes(m_pa_pLayout,pal);

                        pango_attr_list_unref(pal);

            };

 

            pa = pango_attr_size_new(m_sFontSize * PANGO_SCALE);

            pa = pango_attr_weight_new(m_pangoWeight);  

            pango_attr_list_change(pal, pa);

            pango_layout_set_attributes(m_pa_pLayout, pal);

 

            pango_layout_get_pixel_size(m_pa_pLayout, width, height);

};

 

where m_ … are member variable appropriately set.

I mean

 

PangoFontDescription   *m_pa_pFontDescr;

PangoLayout                 *m_pa_pLayout;

short                             m_sFontSize;

PangoWeight                m_pangoWeight;

 

Where

 

m_pa_pLayout  = pango_cairo_create_layout(m_ca_pCairo);

m_pa_pFontDescr = pango_font_description_new ();

 

m_strFont = "Sans"

m_sFontSize = 15;

m_pangoWeight = PANGO_WEIGHT_BOLD;

 

I’ve got also set font description and other things

 

pango_layout_set_text(m_pa_pLayout, “TEST”, -1);

pango_font_description_set_weight(m_pa_pFontDescr, PANGO_WEIGHT_BOLD);

pango_font_description_set_family(m_pa_pFontDescr,”Sans”);

pango_font_description_set_size(m_pa_pFontDescr, m_sFontSize*PANGO_SCALE);     

 

 

Could you tell me where is the error or if is a other, correct way, to get the text extension using pango –cairo.

 

Thanks in advance

Best regards

Andrea Ricchetti