HB_TAG('f','i','n','2'),
HB_TAG('f','i','n','3'),
};
+/* Same order as arabic_features. Don't need Syriac stuff.*/
+enum joining_form_t {
+ ISOL,
+ INIT,
+ MEDI,
+ FINA,
+ _NONE
+};
static const hb_tag_t
other_features[] =
{
/* "Topographical features" */
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" */
}
static void
-setup_syllables (const hb_ot_shape_plan_t *plan,
- hb_font_t *font HB_UNUSED,
+setup_rphf_mask (const hb_ot_shape_plan_t *plan,
hb_buffer_t *buffer)
{
- find_syllables (buffer);
-
- /* Setup 'rphf' mask. */
-
const use_shape_plan_t *use_plan = (const use_shape_plan_t *) plan->data;
hb_mask_t mask = use_plan->rphf_mask;
}
static void
+setup_topographical_masks (const hb_ot_shape_plan_t *plan,
+ hb_buffer_t *buffer)
+{
+
+ ASSERT_STATIC (INIT < 4 && ISOL < 4 && MEDI < 4 && FINA < 4);
+ hb_mask_t masks[4], all_masks = 0;
+ for (unsigned int i = 0; i < 4; i++)
+ {
+ masks[i] = plan->map.get_1_mask (arabic_features[i]);
+ if (masks[i] == plan->map.get_global_mask ())
+ masks[i] = 0;
+ all_masks |= masks[i];
+ }
+ if (!all_masks)
+ return;
+ hb_mask_t other_masks = ~all_masks;
+
+ unsigned int last_start = 0;
+ joining_form_t last_form = _NONE;
+ hb_glyph_info_t *info = buffer->info;
+ foreach_syllable (buffer, start, end)
+ {
+ syllable_type_t syllable_type = (syllable_type_t) (info[start].syllable() & 0x0F);
+ switch (syllable_type)
+ {
+ case independent_cluster:
+ case symbol_cluster:
+ /* These don't join. Nothing to do. */
+ last_form = _NONE;
+ break;
+
+ case virama_terminated_cluster:
+ case consonant_cluster:
+ case vowel_cluster:
+ case number_joiner_terminated_cluster:
+ case numeral_cluster:
+ case broken_cluster:
+
+ bool join = last_form == FINA || last_form == ISOL;
+
+ if (join)
+ {
+ /* Fixup previous syllable's form. */
+ last_form = last_form == FINA ? MEDI : INIT;
+ for (unsigned int i = last_start; i < start; i++)
+ info[i].mask = (info[i].mask & other_masks) | masks[last_form];
+ }
+
+ /* Form for this syllable. */
+ last_form = join ? FINA : ISOL;
+ for (unsigned int i = start; i < end; i++)
+ info[i].mask = (info[i].mask & other_masks) | masks[last_form];
+
+ break;
+ }
+
+ last_start = start;
+ }
+}
+
+static void
+setup_syllables (const hb_ot_shape_plan_t *plan,
+ hb_font_t *font HB_UNUSED,
+ hb_buffer_t *buffer)
+{
+ find_syllables (buffer);
+ setup_rphf_mask (plan, buffer);
+ setup_topographical_masks (plan, buffer);
+}
+
+static void
clear_substitution_flags (const hb_ot_shape_plan_t *plan,
hb_font_t *font HB_UNUSED,
hb_buffer_t *buffer)