Fw: [cairo] Problem with fonts

[Baptiste Gaillard]

I'm using Cairo with The Glade/GTK+ for Windows Toolkit. It includes Cairo, 
do you know if Cairo is compiled with the freetype engine in this package ?

> ----- Original Message ----- 
> From: "Behdad Esfahbod" <behdad at behdad.org>
> To: "Baptiste Gaillard" <b_gaillard at hotmail.com>
> Cc: <cairo at cairographics.org>
> Sent: Monday, July 24, 2006 9:11 PM
> Subject: Re: Fw: [cairo] Problem with fonts
>
>
>>I assume your cairo is compiled without FreeType.  Then it's a problem
>> in the Win32 font backend.  I have no idea about that backend.
>>
>> behdad
>>
>> On Mon, 2006-07-24 at 09:47 +0200, Baptiste Gaillard wrote:
>>> Ok, the result is the same with the Vera font take from
>>> C:\Windows\fonts\Vera.ttf. I attach 2 files to this message, the first 
>>> show
>>> the result using AGG, the second using Cairo, the font size is the same. 
>>> But
>>> there is no anti-aliasing with Cairo !!
>>>
>>> Here is the code I used:
>>>
>>> int main(int argc, char** argv) {
>>>  cairo_surface_t *surface;
>>>   cairo_t *cr;
>>>
>>>  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, WIDTH, 
>>> HEIGHT);
>>>  cr = cairo_create (surface);
>>>
>>>
>>>  cairo_set_source_rgb(cr, 1,1,1);
>>>  cairo_set_line_width(cr, 1);
>>>  cairo_set_antialias (cr,CAIRO_ANTIALIAS_GRAY);
>>>
>>>  cairo_font_options_t* font_options =  cairo_font_options_create();
>>>  cairo_font_options_set_antialias(font_options, CAIRO_ANTIALIAS_GRAY);
>>>  cairo_set_font_options (cr, font_options);
>>>
>>>  cairo_select_font_face (cr, "Vera.ttf", CAIRO_FONT_SLANT_NORMAL,
>>> CAIRO_FONT_WEIGHT_NORMAL);
>>>  cairo_set_font_size (cr, 16);
>>>
>>>  cairo_glyph_t glyph;
>>>  glyph.index = 0x24;
>>>
>>>  for(unsigned j = 0; j < 10000; j += 50)
>>>   for(unsigned i = 0; i < 10000; i += 50) {
>>>    cairo_move_to (cr, i, j);
>>>    glyph.x = i;
>>>    glyph.y = j;
>>>    cairo_show_glyphs(cr, &glyph, 1);
>>>   }
>>>
>>> cairo_surface_write_to_png  (surface, "test.png");
>>> cairo_font_options_destroy(font_options);
>>> cairo_destroy (cr);
>>> cairo_surface_destroy (surface);
>>>
>>> return 0;
>>> }
>>>
>>> Thanks.
>>>
>>> Baptiste
>>>
>>> ----- Original Message ----- 
>>> From: "Behdad Esfahbod" <behdad at behdad.org>
>>> To: "Baptiste Gaillard" <b_gaillard at hotmail.com>
>>> Cc: <cairo at cairographics.org>
>>> Sent: Friday, July 21, 2006 9:36 PM
>>> Subject: Re: Fw: [cairo] Problem with fonts
>>>
>>>
>>> > On Thu, 2006-07-20 at 06:47 -0400, Baptiste Gaillard wrote:
>>> >> ----- Original Message ----- 
>>> >> From: "Baptiste Gaillard" <b_gaillard at hotmail.com>
>>> >> To: "Behdad Esfahbod" <behdad at behdad.org>
>>> >> Sent: Thursday, July 20, 2006 9:52 AM
>>> >> Subject: Re: [cairo] Problem with fonts
>>> >>
>>> >>
>>> >> > Ok, I've seen an exemple here that use a 0.35 font size
>>> >> > (http://cairographics.org/samples/text.html), so I think it is an
>>> >> > error.
>>> >> > With size like 12-14-16 it works.
>>> >
>>> > Ah, not good.  Carl?
>>> >
>>> >> > But I've also anti-aliasing problem with the other options, I've 
>>> >> > tested
>>> >> > with
>>> >> > CAIRO_ANTIALIAS_GRAY and CAIRO_ANTIALIAS_SUBPIXEL but anti-aliased
>>> >> > seems
>>> >> > again to be off. See the 2 files attached to this message, the 
>>> >> > first is
>>> >> > a
>>> >> > symbol rendere with CAIRO_ANTIALIAS_GRAY, the second is rendered 
>>> >> > with
>>> >> > CAIRO_ANTIALIAS_SUBPIXEL (is it normal that the contours are green 
>>> >> > ?).
>>> >
>>> > The green is kinda expected.  If it doesn't look good on your LCD, you
>>> > may have a different RGB order, or a poor FreeType version.
>>> >
>>> > As for GRAY not working, is it the case that you are using a bitmap
>>> > font?  Can you please try with a widely known font like Bitstream Vera
>>> > and report the results of that?
>>> >
>>> > behdad
>>> >
>>> >> >
>>> >> > Thanks.
>>> >> >
>>> >> > Baptiste.
>>> >> >
>>> >> _______________________________________________
>>> >> cairo mailing list
>>> >> cairo at cairographics.org
>>> >> http://cairographics.org/cgi-bin/mailman/listinfo/cairo
>>> > -- 
>>> > behdad
>>> > http://behdad.org/
>>> >
>>> > "Commandment Three says Do Not Kill, Amendment Two says Blood Will 
>>> > Spill"
>>> >        -- Dan Bern, "New American Language"
>>> >
>>> >
>> -- 
>> behdad
>> http://behdad.org/
>>
>> "Commandment Three says Do Not Kill, Amendment Two says Blood Will Spill"
>>        -- Dan Bern, "New American Language"
>>
>>
>