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[Arabic] Respect Arabic joining from neighboring context 

Now we respect Arabic joining across runs.
This commit is contained in:
Behdad Esfahbod 2012-09-25 21:32:35 -04:00
parent 05207a79e0
commit bdc2fc8294
1 changed files with 29 additions and 2 deletions
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31
src/hb-ot-shape-complex-arabic.cc
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@ -229,10 +229,23 @@ static void
arabic_joining (hb_buffer_t *buffer)
{
unsigned int count = buffer->len;
unsigned int prev = 0, state = 0;
unsigned int prev = (unsigned int) -1, state = 0;
HB_BUFFER_ALLOCATE_VAR (buffer, arabic_shaping_action);
/* Check pre-context */
for (unsigned int i = 0; i < buffer->context_len[0]; i++)
{
unsigned int this_type = get_joining_type (buffer->context[0][i], buffer->unicode->general_category (buffer->context[0][i]));
if (unlikely (this_type == JOINING_TYPE_T))
continue;
const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
state = entry->next_state;
break;
}
for (unsigned int i = 0; i < count; i++)
{
unsigned int this_type = get_joining_type (buffer->info[i].codepoint, _hb_glyph_info_get_general_category (&buffer->info[i]));
@ -244,7 +257,7 @@ arabic_joining (hb_buffer_t *buffer)
const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
if (entry->prev_action != NONE)
if (entry->prev_action != NONE && prev != (unsigned int) -1)
buffer->info[prev].arabic_shaping_action() = entry->prev_action;
buffer->info[i].arabic_shaping_action() = entry->curr_action;
@ -253,6 +266,20 @@ arabic_joining (hb_buffer_t *buffer)
state = entry->next_state;
}
for (unsigned int i = 0; i < buffer->context_len[1]; i++)
{
unsigned int this_type = get_joining_type (buffer->context[1][i], buffer->unicode->general_category (buffer->context[0][i]));
if (unlikely (this_type == JOINING_TYPE_T))
continue;
const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
if (entry->prev_action != NONE && prev != (unsigned int) -1)
buffer->info[prev].arabic_shaping_action() = entry->prev_action;
break;
}
HB_BUFFER_DEALLOCATE_VAR (buffer, arabic_shaping_action);
}