[subset] Move OS/2 to subset2.

src/hb-ot-os2-table.hh

@@ -145,29 +145,20 @@ struct OS2
     }
   }
 
-  bool subset (hb_subset_plan_t *plan) const
+  bool subset (hb_subset_context_t *c) const
   {
-    hb_blob_t *os2_blob = hb_sanitize_context_t ().reference_table<OS2> (plan->source);
-    hb_blob_t *os2_prime_blob = hb_blob_create_sub_blob (os2_blob, 0, -1);
-    // TODO(grieger): move to hb_blob_copy_writable_or_fail
-    hb_blob_destroy (os2_blob);
-
-    OS2 *os2_prime = (OS2 *) hb_blob_get_data_writable (os2_prime_blob, nullptr);
-    if (unlikely (!os2_prime)) {
-      hb_blob_destroy (os2_prime_blob);
-      return false;
-    }
+    TRACE_SUBSET (this);
+    OS2 *os2_prime = c->serializer->embed (this);
+    if (unlikely (!os2_prime)) return_trace (false);
 
     uint16_t min_cp, max_cp;
-    find_min_and_max_codepoint (plan->unicodes, &min_cp, &max_cp);
+    find_min_and_max_codepoint (c->plan->unicodes, &min_cp, &max_cp);
     os2_prime->usFirstCharIndex = min_cp;
     os2_prime->usLastCharIndex = max_cp;
 
-    _update_unicode_ranges (plan->unicodes, os2_prime->ulUnicodeRange);
-    bool result = plan->add_table (HB_OT_TAG_OS2, os2_prime_blob);
+    _update_unicode_ranges (c->plan->unicodes, os2_prime->ulUnicodeRange);
 
-    hb_blob_destroy (os2_prime_blob);
-    return result;
+    return_trace (true);
   }
 
   void _update_unicode_ranges (const hb_set_t *codepoints,
@@ -218,6 +209,15 @@ struct OS2
   font_page_t get_font_page () const
   { return (font_page_t) (version == 0 ? fsSelection & 0xFF00 : 0); }
 
+  unsigned get_size () const
+  {
+    unsigned result = min_size;
+    if (version >= 1) result += v1X.get_size ();
+    if (version >= 2) result += v2X.get_size ();
+    if (version >= 5) result += v5X.get_size ();
+    return result;
+  }
+
   bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);

src/hb-subset.cc

@@ -190,7 +190,7 @@ _subset_table (hb_subset_plan_t *plan,
       result = _subset<const OT::cmap> (plan);
       break;
     case HB_OT_TAG_OS2:
-      result = _subset<const OT::OS2> (plan);
+      result = _subset2<const OT::OS2> (plan);
       break;
     case HB_OT_TAG_post:
       result = _subset2<const OT::post> (plan);