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[USE] Do Arabic-like shaping

This commit is contained in:
Behdad Esfahbod 2015-07-22 11:16:01 +01:00
parent 9daf2dfb6b
commit 8ba9e68968
1 changed files with 75 additions and 2 deletions
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77
src/hb-ot-shape-complex-use.cc
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@ -27,6 +27,7 @@
*/
#include "hb-ot-shape-complex-use-private.hh"
#include "hb-ot-shape-complex-arabic-private.hh"
/* buffer var allocations */
#define use_category() complex_var_u8_0()
@ -53,6 +54,19 @@ basic_features[] =
HB_TAG('c','j','c','t'),
};
static const hb_tag_t
arabic_features[] =
{
HB_TAG('i','s','o','l'),
HB_TAG('i','n','i','t'),
HB_TAG('m','e','d','i'),
HB_TAG('f','i','n','a'),
/* The spec doesn't specify these but we apply anyway, since our Arabic shaper
* does. These are only used in Syriac spec. */
HB_TAG('m','e','d','2'),
HB_TAG('f','i','n','2'),
HB_TAG('f','i','n','3'),
};
static const hb_tag_t
other_features[] =
{
/*
@ -120,7 +134,10 @@ collect_features_use (hb_ot_shape_planner_t *plan)
map->add_gsub_pause (reorder);
/* "Topographical features" */
// TODO isol/init/medi/fina
for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
map->add_feature (arabic_features[i], 1, F_NONE);
map->add_gsub_pause (NULL);
/* "Standard typographic presentation" and "Positional feature application" */
for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
@ -132,8 +149,41 @@ struct use_shape_plan_t
ASSERT_POD ();
hb_mask_t rphf_mask;
arabic_shape_plan_t *arabic_plan;
};
static bool
has_arabic_joining (hb_script_t script)
{
/* List of scripts that have data in arabic-table. */
switch ((int) script)
{
/* Unicode-1.1 additions */
case HB_SCRIPT_ARABIC:
/* Unicode-3.0 additions */
case HB_SCRIPT_MONGOLIAN:
case HB_SCRIPT_SYRIAC:
/* Unicode-5.0 additions */
case HB_SCRIPT_NKO:
case HB_SCRIPT_PHAGS_PA:
/* Unicode-6.0 additions */
case HB_SCRIPT_MANDAIC:
/* Unicode-7.0 additions */
case HB_SCRIPT_MANICHAEAN:
case HB_SCRIPT_PSALTER_PAHLAVI:
return true;
default:
return false;
}
}
static void *
data_create_use (const hb_ot_shape_plan_t *plan)
{
@ -143,12 +193,27 @@ data_create_use (const hb_ot_shape_plan_t *plan)
use_plan->rphf_mask = plan->map.get_1_mask (HB_TAG('r','p','h','f'));
if (has_arabic_joining (plan->props.script))
{
use_plan->arabic_plan = (arabic_shape_plan_t *) data_create_arabic (plan);
if (unlikely (!use_plan->arabic_plan))
{
free (use_plan);
return NULL;
}
}
return use_plan;
}
static void
data_destroy_use (void *data)
{
use_shape_plan_t *use_plan = (use_shape_plan_t *) data;
if (use_plan->arabic_plan)
data_destroy_arabic (use_plan->arabic_plan);
free (data);
}
@ -175,10 +240,18 @@ set_use_properties (hb_glyph_info_t &info)
static void
setup_masks_use (const hb_ot_shape_plan_t *plan HB_UNUSED,
setup_masks_use (const hb_ot_shape_plan_t *plan,
hb_buffer_t *buffer,
hb_font_t *font HB_UNUSED)
{
const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
/* Do this before allocating use_category(). */
if (use_plan->arabic_plan)
{
setup_masks_arabic_plan (use_plan->arabic_plan, buffer, plan->props.script);
}
HB_BUFFER_ALLOCATE_VAR (buffer, use_category);
/* We cannot setup masks here. We save information about characters