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

[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);
>
>
>
>
>
>
>
>         _______________________________________________
>         gtk-i18n-list mailing list
>         gtk-i18n-list gnome org <mailto:gtk-i18n-list gnome org>
>         http://mail.gnome.org/mailman/listinfo/gtk-i18n-list