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

[Nicolas Lacombe <n lacombe gmail com>]

Of course, sorry about that.

I'm running pango on windows (with MSVC), using the binaries provided by GTK+ (http://www.gtk.org/download-windows.html).

For the pango viewer, I just created a small visual studio project to see how it work, link it statically with the GTK+ binaries and run it. Pangocairo work as intended whereas pangoft2 does not interpret results.

2009/12/1 Behdad Esfahbod <behdad behdad org>

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.

Nico.

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

   Hi,

   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.

   behdad


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

       Hi,

       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?


       PANGO & CAIRO RENDERING (WORKING AS INTENDED)

       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);
       cairo_paint(cr);

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


       PangoContext *context;

       PangoFontMap* PFM = pango_ft2_font_map_new();
       pango_ft2_font_map_set_resolution(PANGO_FT2_FONT_MAP(PFM),
       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_font_description_free(desc);

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

       pango_layout_context_changed(layout);
       pango_ft2_render_layout(bm, layout, 0, 0);







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