[arabic] Use manual-zwj instead of flipping joiners
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@ -68,8 +68,7 @@ enum hb_buffer_scratch_flags_t {
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HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK = 0x00000004u,
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HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK = 0x00000004u,
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HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000008u,
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HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000008u,
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HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK = 0x00000010u,
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HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK = 0x00000010u,
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HB_BUFFER_SCRATCH_FLAG_HAS_JOINERS = 0x00000020u,
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HB_BUFFER_SCRATCH_FLAG_HAS_CGJ = 0x00000020u,
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HB_BUFFER_SCRATCH_FLAG_HAS_CGJ = 0x00000040u,
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/* Reserved for complex shapers' internal use. */
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/* Reserved for complex shapers' internal use. */
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HB_BUFFER_SCRATCH_FLAG_COMPLEX0 = 0x01000000u,
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HB_BUFFER_SCRATCH_FLAG_COMPLEX0 = 0x01000000u,
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@ -224,16 +224,8 @@ _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer)
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{
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{
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES;
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES;
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props |= UPROPS_MASK_IGNORABLE;
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props |= UPROPS_MASK_IGNORABLE;
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if (u == 0x200Cu)
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if (u == 0x200Cu) props |= UPROPS_MASK_Cf_ZWNJ;
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{
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else if (u == 0x200Du) props |= UPROPS_MASK_Cf_ZWJ;
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props |= UPROPS_MASK_Cf_ZWNJ;
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_JOINERS;
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}
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else if (u == 0x200Du)
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{
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props |= UPROPS_MASK_Cf_ZWJ;
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buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_JOINERS;
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}
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/* Mongolian Free Variation Selectors need to be remembered
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/* Mongolian Free Variation Selectors need to be remembered
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* because although we need to hide them like default-ignorables,
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* because although we need to hide them like default-ignorables,
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* they need to non-ignorable during shaping. This is similar to
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* they need to non-ignorable during shaping. This is similar to
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@ -158,11 +158,6 @@ static const struct arabic_state_table_entry {
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};
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};
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static void
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flip_joiners (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_buffer_t *buffer);
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static void
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static void
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arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
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arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_font_t *font,
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@ -217,28 +212,20 @@ collect_features_arabic (hb_ot_shape_planner_t *plan)
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}
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}
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/* Normally, Unicode says a ZWNJ means "don't ligate". In Arabic script
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/* Normally, Unicode says a ZWNJ means "don't ligate". In Arabic script
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* however, it says a ZWJ should also mean "don't ligate". So we convert
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* however, it says a ZWJ should also mean "don't ligate". So we run
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* a ZWJ to a ZWNJ for GSUB. We want to revert it back to ZWJ before
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* the main ligating features as MANUAL_ZWJ. */
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* GPOS processing though. So we just flip their roles, and flip back
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* later. Note that this makes a ZWNJ into ZWJ for GSUB stage, which
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* means it would *not* break ligatures. But since ligatures around
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* ZWNJ are rare, we don't care.
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*
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* Since we don't currently have a way to apply a pause before GPOS
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* starts, let's just do this dance around a few required GUSB features. */
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map->add_gsub_pause (flip_joiners);
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map->add_feature (HB_TAG('r','l','i','g'), F_GLOBAL | F_HAS_FALLBACK);
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map->add_feature (HB_TAG('r','l','i','g'), F_GLOBAL | F_MANUAL_ZWJ | F_HAS_FALLBACK);
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if (plan->props.script == HB_SCRIPT_ARABIC)
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if (plan->props.script == HB_SCRIPT_ARABIC)
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map->add_gsub_pause (arabic_fallback_shape);
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map->add_gsub_pause (arabic_fallback_shape);
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/* No pause after rclt. See 98460779bae19e4d64d29461ff154b3527bf8420. */
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/* No pause after rclt. See 98460779bae19e4d64d29461ff154b3527bf8420. */
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map->enable_feature (HB_TAG('r','c','l','t'));
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map->add_feature (HB_TAG('r','c','l','t'), F_GLOBAL | F_MANUAL_ZWJ);
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map->enable_feature (HB_TAG('c','a','l','t'));
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map->add_feature (HB_TAG('c','a','l','t'), F_GLOBAL | F_MANUAL_ZWJ);
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map->add_gsub_pause (nullptr);
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/* And undo here. */
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/* And undo here. */
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map->add_gsub_pause (flip_joiners);
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/* The spec includes 'cswh'. Earlier versions of Windows
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/* The spec includes 'cswh'. Earlier versions of Windows
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* used to enable this by default, but testing suggests
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* used to enable this by default, but testing suggests
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@ -393,22 +380,6 @@ setup_masks_arabic (const hb_ot_shape_plan_t *plan,
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setup_masks_arabic_plan (arabic_plan, buffer, plan->props.script);
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setup_masks_arabic_plan (arabic_plan, buffer, plan->props.script);
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}
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}
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static void
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flip_joiners (const hb_ot_shape_plan_t *plan HB_UNUSED,
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hb_font_t *font HB_UNUSED,
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hb_buffer_t *buffer)
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{
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if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_JOINERS))
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return;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++)
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if (_hb_glyph_info_is_joiner (&info[i]))
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_hb_glyph_info_flip_joiners (&info[i]);
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}
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static void
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static void
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arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
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arabic_fallback_shape (const hb_ot_shape_plan_t *plan,
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hb_font_t *font,
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hb_font_t *font,
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