Re: Rendering Arabic text with Pango & Cairo VS Pango & FreeType

You can at least tell us about your build environment?!!

On 12/01/2009 02:09 AM, Nicolas Lacombe wrote:
Thx for your answear.

I don't know wich fonts are using the pagocairo backend... how can I
know this informations?

I tested the pango viewer included in the source under windows
yesterday, and the pangoft2 test gave me wrong results again, so it
looks like I'm not doing anything wrong in my code.

Problem is I really need to use freetype, so I guess I'll have to write
the arabic module myself.


2009/11/30 Behdad Esfahbod <behdad behdad org <mailto:behdad behdad org>>


    I'm not sure why it doesn't work for you.  Is the pangocairo backend
    using FreeType fonts or win32?  At any rate, the pangoft2 backend
    has been deprecated for years.  I suggest you use pangocairo instead.


    On 11/30/2009 09:48 AM, Nicolas Lacombe wrote:


        I want to use Pango high level functionnality to render arabic
        tex in a
        FreeType environnement.

        Using Pango with Cairo, it works perfectly, the text is correctly
        rendered with ligatures typographic ligature.

        However, in a freetype environnement, ligature disapear! I can
        still see
        the text, but only the original form of each glyph, thus without any
        contextual interpretation.

        Am I doing anything wrong?


        cairo_surface_t *surface;
        cairo_t *cr;

        PangoLayout *layout;

        surface = cairo_image_surface_create(CAIRO_FORMAT_A8, 512, 512);
        cr = cairo_create(surface);
        cairo_set_source_rgba(cr, 1., 1., 1., 0.0);

        layout = pango_cairo_create_layout(cr);
        PangoFontDescription *desc;
        desc = pango_font_description_from_string("Arial, 20");
        pango_layout_set_font_description  (layout, desc);

        pango_layout_set_text(layout, txt, -1);
        cairo_set_line_width(cr, 0.5);
        cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);

        pango_cairo_update_layout(cr, layout);
        pango_cairo_show_layout(cr, layout);

        PANGO & FREETYPE RENDERING (no contextual analysis of the arabic

        PangoContext *context;

        PangoFontMap* PFM = pango_ft2_font_map_new();
        width, height);
        context = pango_font_map_create_context(PANGO_FONT_MAP(PFM));

        FT_Bitmap* bm;
        bm = g_slice_new(FT_Bitmap);
        bm->rows = height;
        bm->width = width;
        bm->pitch = width;
        bm->num_grays = 256;
        bm->pixel_mode = FT_PIXEL_MODE_GRAY;

        bm->buffer = (unsigned char*)g_malloc (bm->pitch * bm->rows);
        memset(bm->buffer, 0x00, bm->pitch * bm->rows);

        layout = pango_layout_new(context);
        static PangoFontDescription *desc;

        desc = pango_font_description_from_string("Arial, 20");
        pango_layout_set_font_description(layout, desc);

        pango_layout_set_auto_dir (layout, 1);
        pango_layout_set_text(layout, txt, -1);

        pango_ft2_render_layout(bm, layout, 0, 0);

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