[HarfBuzz] Problem with shaping Serif fonts

[Rolf Langenhuijzen]

Why wouldn't you tun off the liga feature in that case?

Rolf 

Eduardo Castiñeyra schreef op 2013-10-09 10:32: 

> Is there any way to avoid that? Despite ff being a single glyph, it represents two clusters, imagine I want to animate the tracking of a word, it would look like this
> 
> e ff i c i e n t 
> 
> Although glyph-wise it would be correct, it would be very hard to convince any customer about that.
> 
> In some cases it would be nice to force the shaper to output at least one glyph per cluster. 
> 
> Does it also depend on the language? If one script have one ligature it doesn't mean every language makes use of it.
> 
> Regards!
> 
> Sent from a mobile device
> 
> On 09/10/2013, at 06:23, Khaled Hosny <khaledhosny at eglug.org> wrote:
> On Wed, Oct 09, 2013 at 01:39:17AM +0200, Oliver Meier wrote: Hello I recently started playing with harfbuzz and encountered a strange problem. I don't know what I'm doing wrong, but somehow multiple f's shaped for serif fonts like DejaVuSerif or FreeSerif get grouped in pairs or so.. hb_buffer_set_direction( hb_buffer, HB_DIRECTION_LTR ); hb_buffer_set_script( hb_buffer, HB_SCRIPT_LATIN ); hb_buffer_set_language( hb_buffer, hb_language_from_string("en", strlen("en")) ); hb_buffer_add_utf8( hb_buffer, "ffff", strlen("ffff"), 0, strlen("ffff") ); hb_shape( hb_ft_font, hb_buffer, NULL, 0 ); hb_glyph_info_t *glyph_info = hb_buffer_get_glyph_infos(hb_buffer, &glyph_count); At this point glyph_count=2 instead of 4. In the kerning i see that f's are indeed "grouped". Can someone point me in the right direction, or is this a bug? https://en.wikipedia.org/wiki/Typographic_ligature#Latin_alphabet [1] BTW, if you have any code that assumes the number of output glyphs will be equal t!
 o the
number of input characters, it is wrong. Regards, Khaled _______________________________________________ HarfBuzz mailing list HarfBuzz at lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/harfbuzz [2]

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Links:
------
[1] https://en.wikipedia.org/wiki/Typographic_ligature#Latin_alphabet
[2] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
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