We are newers in HB and have problems with using HB on Windows in our project
for rendering Arabic/Indic and etc. languages. MAIN our goal while using
harfbuzz is to get appropriate ligatures/replacement glyph indexes and etc. We
build HB on msvc9, use FT-2.4.2 and ICU-4c-4_8_1. Our implementation of buffer
shaping example is next:
/* Get our harfbuzz font/face structs */
hb_font_t *hb_ft_font = hb_ft_font_create(Font_Mgr::Font_Face, NULL);
hb_face_t *hb_ft_face = hb_ft_face_create(Font_Mgr::Font_Face, NULL);
hb_ft_font_set_funcs (hb_ft_font); // IS IT AS A MUST or could be
ommited??
wchar_t *w_cut_text = L"عر بي"; // x0639, 0x0631, 0x0020, 0x0628,
0x064a
// INPUT string is wchar_t - NOT SURE that further conversion works
well!!
uint16_t *cur_text_16 = (uint16_t*)w_cut_text;
const char *cur_lang = "ar"; // OK
/* Create a buffer for harfbuzz to use */
hb_buffer_t *buffer = hb_buffer_create(); //OK
hb_buffer_set_unicode_funcs(buffer, hb_icu_get_unicode_funcs());
// WHAT IS THE PURPOSE OF USING hb_icu_get_unicode_funcs() or what own
implemtation should provide??
hb_buffer_set_direction(buffer, HB_DIRECTION_RTL); //OK
hb_buffer_set_script(buffer, HB_SCRIPT_ARABIC); //OK
hb_buffer_set_language(buffer, hb_language_from_string(cur_lang)); //OK
/* Layout the text */
hb_buffer_add_utf16 (buffer, cur_text_16, 5, 0, 5); // WHAT is the
semantic
usage of 3 last parameters??
hb_shape (hb_ft_font, buffer, NULL, 0);
/* Hand the layout to render */
unsigned int glyph_count = hb_buffer_get_length (buffer);
hb_glyph_info_t *glyph_infos = hb_buffer_get_glyph_infos (buffer, NULL);
hb_glyph_position_t *glyph_positions = hb_buffer_get_glyph_positions
(buffer,
NULL);
for (unsigned int i = 0; i < glyph_count; i++)
{
hb_glyph_info_t *info = &glyph_infos[i];
hb_glyph_position_t *pos = &glyph_positions[i];
printf ("cluster %d glyph 0x%x at (%d,%d)+(%d,%d)\n",
info->cluster,
info->codepoint,
pos->x_offset,
pos->x_offset,
pos->x_advance,
pos->y_advance);
}
hb_buffer_destroy (buffer);
hb_font_destroy (hb_ft_font);
hb_face_destroy (hb_ft_face);
AS AN OUTPUT we got array of glyphs indexes in info->codepoint, but this array
is the same as array of glyphs indexes, that backs FT for text
{'ع','ر',' ','ب','ي'}.
- > BUT DID NOT GET EXPECTED ligatures/replaced glyphs and etc. So, only string
revers is worked good.
What are we donig wrong??
Could you please give any ideas or provide a sample code for a such task!
THANK YOU VERY MUCH IN ADVANCED!
WE ARE LOOKING FORWARD RECEIVING FEEDBACK FROM YOU!
REGARDS,
Sergey.
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