[OT] Add shape_plan to Arabic shaper
This commit is contained in:
parent
344cc56698
commit
e9f28a38f5
|
@ -1,5 +1,5 @@
|
|||
/*
|
||||
* Copyright © 2010 Google, Inc.
|
||||
* Copyright © 2010,2012 Google, Inc.
|
||||
*
|
||||
* This is part of HarfBuzz, a text shaping library.
|
||||
*
|
||||
|
@ -99,7 +99,7 @@ static uint16_t get_ligature (hb_codepoint_t first, hb_codepoint_t second)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static const hb_tag_t arabic_syriac_features[] =
|
||||
static const hb_tag_t arabic_features[] =
|
||||
{
|
||||
HB_TAG('i','n','i','t'),
|
||||
HB_TAG('m','e','d','i'),
|
||||
|
@ -127,9 +127,7 @@ enum {
|
|||
|
||||
NONE,
|
||||
|
||||
COMMON_NUM_FEATURES = 4,
|
||||
SYRIAC_NUM_FEATURES = 7,
|
||||
TOTAL_NUM_FEATURES = NONE
|
||||
ARABIC_NUM_FEATURES = NONE
|
||||
};
|
||||
|
||||
static const struct arabic_state_table_entry {
|
||||
|
@ -184,9 +182,8 @@ collect_features_arabic (hb_ot_shape_planner_t *plan)
|
|||
|
||||
map->add_gsub_pause (NULL);
|
||||
|
||||
unsigned int num_features = plan->props.script == HB_SCRIPT_SYRIAC ? SYRIAC_NUM_FEATURES : COMMON_NUM_FEATURES;
|
||||
for (unsigned int i = 0; i < num_features; i++)
|
||||
map->add_bool_feature (arabic_syriac_features[i], false);
|
||||
for (unsigned int i = 0; i < ARABIC_NUM_FEATURES; i++)
|
||||
map->add_bool_feature (arabic_features[i], false);
|
||||
|
||||
map->add_gsub_pause (NULL);
|
||||
|
||||
|
@ -200,10 +197,51 @@ collect_features_arabic (hb_ot_shape_planner_t *plan)
|
|||
map->add_bool_feature (HB_TAG('c','s','w','h'));
|
||||
}
|
||||
|
||||
struct arabic_shape_plan_t
|
||||
{
|
||||
ASSERT_POD ();
|
||||
|
||||
bool do_fallback;
|
||||
hb_mask_t mask_array[ARABIC_NUM_FEATURES];
|
||||
};
|
||||
|
||||
static void *
|
||||
data_create_arabic (const hb_ot_shape_plan_t *plan)
|
||||
{
|
||||
arabic_shape_plan_t *arabic_plan = (arabic_shape_plan_t *) calloc (1, sizeof (arabic_shape_plan_t));
|
||||
if (unlikely (!arabic_plan))
|
||||
return NULL;
|
||||
|
||||
hb_mask_t total_masks = 0;
|
||||
for (unsigned int i = 0; i < ARABIC_NUM_FEATURES; i++) {
|
||||
arabic_plan->mask_array[i] = plan->map.get_1_mask (arabic_features[i]);
|
||||
total_masks |= arabic_plan->mask_array[i];
|
||||
}
|
||||
|
||||
/* Pitfalls:
|
||||
* - This path fires if user force-set init/medi/fina/isol off,
|
||||
* - If font does not declare script 'arab', well, what to do?
|
||||
* Most probably it's safe to assume that init/medi/fina/isol
|
||||
* still mean Arabic shaping, although they do not have to.
|
||||
*/
|
||||
arabic_plan->do_fallback = 0 == total_masks;
|
||||
|
||||
return arabic_plan;
|
||||
}
|
||||
|
||||
static void
|
||||
data_destroy_arabic (void *data)
|
||||
{
|
||||
free (data);
|
||||
}
|
||||
|
||||
static void
|
||||
arabic_fallback_shape (hb_font_t *font, hb_buffer_t *buffer)
|
||||
{
|
||||
/* Only Arabic has presentation forms encoded in Unicode. */
|
||||
if (buffer->props.script != HB_SCRIPT_ARABIC)
|
||||
return;
|
||||
|
||||
unsigned int count = buffer->len;
|
||||
hb_codepoint_t glyph;
|
||||
|
||||
|
@ -240,6 +278,8 @@ setup_masks_arabic (const hb_ot_shape_plan_t *plan,
|
|||
hb_buffer_t *buffer,
|
||||
hb_font_t *font)
|
||||
{
|
||||
const arabic_shape_plan_t *arabic_plan = (const arabic_shape_plan_t *) plan->data;
|
||||
|
||||
unsigned int count = buffer->len;
|
||||
unsigned int prev = 0, state = 0;
|
||||
|
||||
|
@ -265,28 +305,12 @@ setup_masks_arabic (const hb_ot_shape_plan_t *plan,
|
|||
state = entry->next_state;
|
||||
}
|
||||
|
||||
hb_mask_t mask_array[TOTAL_NUM_FEATURES + 1] = {0};
|
||||
hb_mask_t total_masks = 0;
|
||||
unsigned int num_masks = buffer->props.script == HB_SCRIPT_SYRIAC ? SYRIAC_NUM_FEATURES : COMMON_NUM_FEATURES;
|
||||
for (unsigned int i = 0; i < num_masks; i++) {
|
||||
mask_array[i] = plan->map.get_1_mask (arabic_syriac_features[i]);
|
||||
total_masks |= mask_array[i];
|
||||
}
|
||||
|
||||
if (total_masks) {
|
||||
if (likely (!arabic_plan->do_fallback)) {
|
||||
/* Has OpenType tables */
|
||||
for (unsigned int i = 0; i < count; i++)
|
||||
buffer->info[i].mask |= mask_array[buffer->info[i].arabic_shaping_action()];
|
||||
} else if (buffer->props.script == HB_SCRIPT_ARABIC) {
|
||||
/* Fallback Arabic shaping to Presentation Forms */
|
||||
/* Pitfalls:
|
||||
* - This path fires if user force-set init/medi/fina/isol off,
|
||||
* - If font does not declare script 'arab', well, what to do?
|
||||
* Most probably it's safe to assume that init/medi/fina/isol
|
||||
* still mean Arabic shaping, although they do not have to.
|
||||
*/
|
||||
buffer->info[i].mask |= arabic_plan->mask_array[buffer->info[i].arabic_shaping_action()];
|
||||
} else
|
||||
arabic_fallback_shape (font, buffer);
|
||||
}
|
||||
|
||||
HB_BUFFER_DEALLOCATE_VAR (buffer, arabic_shaping_action);
|
||||
}
|
||||
|
@ -296,8 +320,8 @@ const hb_ot_complex_shaper_t _hb_ot_complex_shaper_arabic =
|
|||
"arabic",
|
||||
collect_features_arabic,
|
||||
NULL, /* override_features */
|
||||
NULL, /* data_create */
|
||||
NULL, /* data_destroy */
|
||||
data_create_arabic,
|
||||
data_destroy_arabic,
|
||||
NULL, /* normalization_preference */
|
||||
setup_masks_arabic,
|
||||
true, /* zero_width_attached_marks */
|
||||
|
|
Loading…
Reference in New Issue