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Implement normalization mode HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL 

In this mode we try composing CCC=0 with CCC=0 characters.  Useful for
Hangul.
This commit is contained in:
Behdad Esfahbod 2012-04-07 14:57:21 -04:00
parent bec2ac4fde
commit 9683184553
1 changed files with 13 additions and 8 deletions
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21
src/hb-ot-shape-normalize.cc
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@ -198,7 +198,7 @@ _hb_ot_shape_normalize (hb_font_t *font, hb_buffer_t *buffer,
buffer->swap_buffers ();
if (!has_multichar_clusters)
if (mode != HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL && !has_multichar_clusters)
return; /* Done! */
@ -243,19 +243,21 @@ _hb_ot_shape_normalize (hb_font_t *font, hb_buffer_t *buffer,
buffer->next_glyph ();
while (buffer->idx < count)
{
if (buffer->info[buffer->idx].combining_class() == 0) {
starter = buffer->out_len;
buffer->next_glyph ();
continue;
}
hb_codepoint_t composed, glyph;
if ((starter == buffer->out_len - 1 ||
if (/* If mode is NOT COMPOSED_FULL (ie. it's COMPOSED_DIACRITICS), we don't try to
* compose a CCC=0 character with it's preceding starter. */
(mode == HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL ||
buffer->info[buffer->idx].combining_class() != 0) &&
/* If there's anything between the starter and this char, they should have CCC
* smaller than this character's. */
(starter == buffer->out_len - 1 ||
buffer->out_info[buffer->out_len - 1].combining_class() < buffer->info[buffer->idx].combining_class()) &&
/* And compose. */
hb_unicode_compose (buffer->unicode,
buffer->out_info[starter].codepoint,
buffer->info[buffer->idx].codepoint,
&composed) &&
/* And the font has glyph for the composite. */
hb_font_get_glyph (font, composed, 0, &glyph))
{
/* Composes. Modify starter and carry on. */
@ -268,6 +270,9 @@ _hb_ot_shape_normalize (hb_font_t *font, hb_buffer_t *buffer,
/* Blocked, or doesn't compose. */
buffer->next_glyph ();
if (buffer->out_info[buffer->out_len - 1].combining_class() == 0)
starter = buffer->out_len - 1;
}
buffer->swap_buffers ();