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

[Behdad Esfahbod <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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