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

[Behdad Esfahbod <behdad behdad org>]

Seems to me like your fontconfig can't find any decent Arabic fonts.  Try 
running fc-match ':lang=ar' and see what you get...


behdad

On 12/01/2009 03:29 AM, Nicolas Lacombe wrote:
> 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 <mailto: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> <mailto: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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