Add HB_NO_AAT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

src/hb-aat-layout.cc

@@ -135,6 +135,10 @@ static const hb_aat_feature_mapping_t feature_mappings[] =
 const hb_aat_feature_mapping_t *
 hb_aat_layout_find_feature_mapping (hb_tag_t tag)
 {
+#ifdef HB_NO_AAT
+  return nullptr;
+#endif
+
   return (const hb_aat_feature_mapping_t *) bsearch (&tag,
 						     feature_mappings,
 						     ARRAY_LENGTH (feature_mappings),
@@ -147,6 +151,8 @@ hb_aat_layout_find_feature_mapping (hb_tag_t tag)
  * hb_aat_apply_context_t
  */
 
+/* Note: This context is used for kerning, even without AAT. */
+
 AAT::hb_aat_apply_context_t::hb_aat_apply_context_t (const hb_ot_shape_plan_t *plan_,
 						     hb_font_t *font_,
 						     hb_buffer_t *buffer_,
@@ -183,6 +189,10 @@ void
 hb_aat_layout_compile_map (const hb_aat_map_builder_t *mapper,
 			   hb_aat_map_t *map)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   const AAT::morx& morx = *mapper->face->table.morx;
   if (morx.has_data ())
   {
@@ -209,6 +219,10 @@ hb_aat_layout_compile_map (const hb_aat_map_builder_t *mapper,
 hb_bool_t
 hb_aat_layout_has_substitution (hb_face_t *face)
 {
+#ifdef HB_NO_AAT
+  return false;
+#endif
+
   return face->table.morx->has_data () ||
 	 face->table.mort->has_data ();
 }
@@ -218,6 +232,10 @@ hb_aat_layout_substitute (const hb_ot_shape_plan_t *plan,
 			  hb_font_t *font,
 			  hb_buffer_t *buffer)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   hb_blob_t *morx_blob = font->face->table.morx.get_blob ();
   const AAT::morx& morx = *morx_blob->as<AAT::morx> ();
   if (morx.has_data ())
@@ -240,6 +258,10 @@ hb_aat_layout_substitute (const hb_ot_shape_plan_t *plan,
 void
 hb_aat_layout_zero_width_deleted_glyphs (hb_buffer_t *buffer)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   unsigned int count = buffer->len;
   hb_glyph_info_t *info = buffer->info;
   hb_glyph_position_t *pos = buffer->pos;
@@ -257,6 +279,10 @@ is_deleted_glyph (const hb_glyph_info_t *info)
 void
 hb_aat_layout_remove_deleted_glyphs (hb_buffer_t *buffer)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   hb_ot_layout_delete_glyphs_inplace (buffer, is_deleted_glyph);
 }
 
@@ -270,6 +296,10 @@ hb_aat_layout_remove_deleted_glyphs (hb_buffer_t *buffer)
 hb_bool_t
 hb_aat_layout_has_positioning (hb_face_t *face)
 {
+#ifdef HB_NO_AAT
+  return false;
+#endif
+
   return face->table.kerx->has_data ();
 }
 
@@ -278,6 +308,10 @@ hb_aat_layout_position (const hb_ot_shape_plan_t *plan,
 			hb_font_t *font,
 			hb_buffer_t *buffer)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   hb_blob_t *kerx_blob = font->face->table.kerx.get_blob ();
   const AAT::kerx& kerx = *kerx_blob->as<AAT::kerx> ();
 
@@ -297,6 +331,10 @@ hb_aat_layout_position (const hb_ot_shape_plan_t *plan,
 hb_bool_t
 hb_aat_layout_has_tracking (hb_face_t *face)
 {
+#ifdef HB_NO_AAT
+  return false;
+#endif
+
   return face->table.trak->has_data ();
 }
 
@@ -305,6 +343,10 @@ hb_aat_layout_track (const hb_ot_shape_plan_t *plan,
 		     hb_font_t *font,
 		     hb_buffer_t *buffer)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   const AAT::trak& trak = *font->face->table.trak;
 
   AAT::hb_aat_apply_context_t c (plan, font, buffer);
@@ -328,6 +370,12 @@ hb_aat_layout_get_feature_types (hb_face_t                    *face,
 				 unsigned int                 *feature_count, /* IN/OUT.  May be NULL. */
 				 hb_aat_layout_feature_type_t *features       /* OUT.     May be NULL. */)
 {
+#ifdef HB_NO_AAT
+  if (feature_count)
+    *feature_count = 0;
+  return 0;
+#endif
+
   return face->table.feat->get_feature_types (start_offset, feature_count, features);
 }
 
@@ -344,6 +392,10 @@ hb_ot_name_id_t
 hb_aat_layout_feature_type_get_name_id (hb_face_t                    *face,
 					hb_aat_layout_feature_type_t  feature_type)
 {
+#ifdef HB_NO_AAT
+  return HB_OT_NAME_ID_INVALID;
+#endif
+
   return face->table.feat->get_feature_name_id (feature_type);
 }
 
@@ -372,5 +424,11 @@ hb_aat_layout_feature_type_get_selector_infos (hb_face_t
 					       hb_aat_layout_feature_selector_info_t *selectors,      /* OUT.     May be NULL. */
 					       unsigned int                          *default_index   /* OUT.     May be NULL. */)
 {
+#ifdef HB_NO_AAT
+  if (selector_count)
+    *selector_count = 0;
+  return 0;
+#endif
+
   return face->table.feat->get_selector_infos (feature_type, start_offset, selector_count, selectors, default_index);
 }

src/hb-aat-map.cc

@@ -34,6 +34,10 @@
 void hb_aat_map_builder_t::add_feature (hb_tag_t tag,
 					unsigned int value)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   if (tag == HB_TAG ('a','a','l','t'))
   {
     feature_info_t *info = features.push();
@@ -53,6 +57,10 @@ void hb_aat_map_builder_t::add_feature (hb_tag_t tag,
 void
 hb_aat_map_builder_t::compile (hb_aat_map_t  &m)
 {
+#ifdef HB_NO_AAT
+  return;
+#endif
+
   /* Sort features and merge duplicates */
   if (features.length)
   {

src/hb-ot-kern-table.hh

@@ -128,9 +128,13 @@ struct KernSubTable
     TRACE_DISPATCH (this, subtable_type);
     switch (subtable_type) {
     case 0:	return_trace (c->dispatch (u.format0));
+#ifndef HB_NO_AAT
     case 1:	return_trace (u.header.apple ? c->dispatch (u.format1, hb_forward<Ts> (ds)...) : c->default_return_value ());
+#endif
     case 2:	return_trace (c->dispatch (u.format2));
+#ifndef HB_NO_AAT
     case 3:	return_trace (u.header.apple ? c->dispatch (u.format3, hb_forward<Ts> (ds)...) : c->default_return_value ());
+#endif
     default:	return_trace (c->default_return_value ());
     }
   }
@@ -278,7 +282,9 @@ struct kern
   {
     switch (get_type ()) {
     case 0: return u.ot.has_state_machine ();
+#ifndef HB_NO_AAT
     case 1: return u.aat.has_state_machine ();
+#endif
     default:return false;
     }
   }
@@ -287,7 +293,9 @@ struct kern
   {
     switch (get_type ()) {
     case 0: return u.ot.has_cross_stream ();
+#ifndef HB_NO_AAT
     case 1: return u.aat.has_cross_stream ();
+#endif
     default:return false;
     }
   }
@@ -296,7 +304,9 @@ struct kern
   {
     switch (get_type ()) {
     case 0: return u.ot.get_h_kerning (left, right);
+#ifndef HB_NO_AAT
     case 1: return u.aat.get_h_kerning (left, right);
+#endif
     default:return 0;
     }
   }
@@ -311,7 +321,9 @@ struct kern
     TRACE_DISPATCH (this, subtable_type);
     switch (subtable_type) {
     case 0:	return_trace (c->dispatch (u.ot, hb_forward<Ts> (ds)...));
+#ifndef HB_NO_AAT
     case 1:	return_trace (c->dispatch (u.aat, hb_forward<Ts> (ds)...));
+#endif
     default:	return_trace (c->default_return_value ());
     }
   }
@@ -328,7 +340,9 @@ struct kern
   HBUINT32		version32;
   HBUINT16		major;
   KernOT		ot;
+#ifndef HB_NO_AAT
   KernAAT		aat;
+#endif
   } u;
   public:
   DEFINE_SIZE_UNION (4, version32);

src/hb-ot-shape.cc

@@ -58,6 +58,10 @@ hb_ot_shape_collect_features (hb_ot_shape_planner_t          *planner,
 static bool
 _hb_apply_morx (hb_face_t *face)
 {
+#ifdef HB_NO_AAT
+  return false;
+#endif
+
   if (hb_options ().aat &&
       hb_aat_layout_has_substitution (face))
     return true;
@@ -83,8 +87,10 @@ hb_ot_shape_planner_t::hb_ot_shape_planner_t (hb_face_t                     *fac
   script_zero_marks = shaper->zero_width_marks != HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE;
   script_fallback_mark_positioning = shaper->fallback_position;
 
+#ifndef HB_NO_AAT
   if (apply_morx)
     shaper = &_hb_ot_complex_shaper_default;
+#endif
 }
 
 void
@@ -94,8 +100,10 @@ hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t           &plan,
   plan.props = props;
   plan.shaper = shaper;
   map.compile (plan.map, key);
+#ifndef HB_NO_AAT
   if (apply_morx)
     aat_map.compile (plan.aat_map);
+#endif
 
   plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));
   plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));
@@ -130,12 +138,18 @@ hb_ot_shape_planner_t::compile (hb_ot_shape_plan_t           &plan,
    * Decide who does positioning. GPOS, kerx, kern, or fallback.
    */
 
-  if (hb_options ().aat && hb_aat_layout_has_positioning (face))
+  if (0)
+    ;
+#ifndef HB_NO_AAT
+  else if (hb_options ().aat && hb_aat_layout_has_positioning (face))
     plan.apply_kerx = true;
+#endif
   else if (!apply_morx && !disable_gpos && hb_ot_layout_has_positioning (face))
     plan.apply_gpos = true;
+#ifndef HB_NO_AAT
   else if (hb_aat_layout_has_positioning (face))
     plan.apply_kerx = true;
+#endif
 
   if (!plan.apply_kerx && !has_gpos_kern)
   {
@@ -202,9 +216,11 @@ void
 hb_ot_shape_plan_t::substitute (hb_font_t   *font,
 				hb_buffer_t *buffer) const
 {
+#ifndef HB_NO_AAT
   if (unlikely (apply_morx))
     hb_aat_layout_substitute (this, font, buffer);
   else
+#endif
     map.substitute (this, font, buffer);
 }
 
@@ -214,15 +230,19 @@ hb_ot_shape_plan_t::position (hb_font_t   *font,
 {
   if (this->apply_gpos)
     map.position (this, font, buffer);
+#ifndef HB_NO_AAT
   else if (this->apply_kerx)
     hb_aat_layout_position (this, font, buffer);
+#endif
   else if (this->apply_kern)
     hb_ot_layout_kern (this, font, buffer);
   else
     _hb_ot_shape_fallback_kern (this, font, buffer);
 
+#ifndef HB_NO_AAT
   if (this->apply_trak)
     hb_aat_layout_track (this, font, buffer);
+#endif
 }
 
 
@@ -318,6 +338,7 @@ hb_ot_shape_collect_features (hb_ot_shape_planner_t          *planner,
 		      feature->value);
   }
 
+#ifndef HB_NO_AAT
   if (planner->apply_morx)
   {
     hb_aat_map_builder_t *aat_map = &planner->aat_map;
@@ -327,6 +348,7 @@ hb_ot_shape_collect_features (hb_ot_shape_planner_t          *planner,
       aat_map->add_feature (feature->tag, feature->value);
     }
   }
+#endif
 
   if (planner->shaper->override_features)
     planner->shaper->override_features (planner);
@@ -761,8 +783,10 @@ static inline void
 hb_ot_substitute_post (const hb_ot_shape_context_t *c)
 {
   hb_ot_hide_default_ignorables (c->buffer, c->font);
+#ifndef HB_NO_AAT
   if (c->plan->apply_morx)
     hb_aat_layout_remove_deleted_glyphs (c->buffer);
+#endif
 
   if (c->plan->shaper->postprocess_glyphs)
     c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font);
@@ -896,8 +920,10 @@ hb_ot_position_complex (const hb_ot_shape_context_t *c)
   /* Finish off.  Has to follow a certain order. */
   hb_ot_layout_position_finish_advances (c->font, c->buffer);
   hb_ot_zero_width_default_ignorables (c->buffer);
+#ifndef HB_NO_AAT
   if (c->plan->apply_morx)
     hb_aat_layout_zero_width_deleted_glyphs (c->buffer);
+#endif
   hb_ot_layout_position_finish_offsets (c->font, c->buffer);
 
   /* The nil glyph_h_origin() func returns 0, so no need to apply it. */