[subset-plan] Simplify _glyphset_mathed allocation

src/hb-ot-math-table.hh

@@ -201,7 +201,7 @@ struct MathItalicsCorrectionInfo
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->_glyphset_mathed;
+    const hb_set_t &glyphset = c->plan->_glyphset_mathed;
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);
@@ -254,7 +254,7 @@ struct MathTopAccentAttachment
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->_glyphset_mathed;
+    const hb_set_t &glyphset = c->plan->_glyphset_mathed;
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);
@@ -486,7 +486,7 @@ struct MathKernInfo
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->_glyphset_mathed;
+    const hb_set_t &glyphset = c->plan->_glyphset_mathed;
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);
@@ -567,7 +567,7 @@ struct MathGlyphInfo
     out->mathItalicsCorrectionInfo.serialize_subset (c, mathItalicsCorrectionInfo, this);
     out->mathTopAccentAttachment.serialize_subset (c, mathTopAccentAttachment, this);
 
-    const hb_set_t &glyphset = *c->plan->_glyphset_mathed;
+    const hb_set_t &glyphset = c->plan->_glyphset_mathed;
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto it =
@@ -938,7 +938,7 @@ struct MathVariants
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->_glyphset_mathed;
+    const hb_set_t &glyphset = c->plan->_glyphset_mathed;
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);

src/hb-subset-plan.cc

@@ -647,14 +647,14 @@ _populate_gids_to_retain (hb_subset_plan_t* plan,
 #endif
   _remove_invalid_gids (&plan->_glyphset_gsub, plan->source->get_num_glyphs ());
 
-  hb_set_set (plan->_glyphset_mathed, &plan->_glyphset_gsub);
+  plan->_glyphset_mathed = plan->_glyphset_gsub;
   if (!drop_tables->has (HB_OT_TAG_MATH))
   {
-    _math_closure (plan, plan->_glyphset_mathed);
-    _remove_invalid_gids (plan->_glyphset_mathed, plan->source->get_num_glyphs ());
+    _math_closure (plan, &plan->_glyphset_mathed);
+    _remove_invalid_gids (&plan->_glyphset_mathed, plan->source->get_num_glyphs ());
   }
 
-  hb_set_t cur_glyphset = *plan->_glyphset_mathed;
+  hb_set_t cur_glyphset = plan->_glyphset_mathed;
   if (!drop_tables->has (HB_OT_TAG_COLR))
   {
     _colr_closure (plan->source, plan->colrv1_layers, plan->colr_palettes, &cur_glyphset);
@@ -852,7 +852,6 @@ hb_subset_plan_create_or_fail (hb_face_t	 *face,
   plan->source = hb_face_reference (face);
   plan->dest = hb_face_builder_create ();
 
-  plan->_glyphset_mathed = hb_set_create ();
   plan->_glyphset_colred = hb_set_create ();
   plan->codepoint_to_glyph = hb_map_create ();
   plan->glyph_map = hb_map_create ();

src/hb-subset-plan.hh

@@ -58,7 +58,6 @@ struct hb_subset_plan_t
     hb_map_destroy (glyph_map);
     hb_map_destroy (reverse_glyph_map);
     hb_map_destroy (glyph_map_gsub);
-    hb_set_destroy (_glyphset_mathed);
     hb_set_destroy (_glyphset_colred);
     hb_map_destroy (colrv1_layers);
     hb_map_destroy (colr_palettes);
@@ -143,7 +142,7 @@ struct hb_subset_plan_t
   unsigned int _num_output_glyphs;
   hb_set_t _glyphset;
   hb_set_t _glyphset_gsub;
-  hb_set_t *_glyphset_mathed;
+  hb_set_t _glyphset_mathed;
   hb_set_t *_glyphset_colred;
 
   //active lookups we'd like to retain