Add set add_coverage() to Coverage()

src/hb-ot-layout-common-private.hh

@@ -134,6 +134,10 @@ struct RangeRecord
     return glyphs->intersects (start, end);
   }
 
+  inline void add_coverage (hb_set_t *glyphs) const {
+    glyphs->add_range (start, end);
+  }
+
   GlyphID	start;		/* First GlyphID in the range */
   GlyphID	end;		/* Last GlyphID in the range */
   USHORT	value;		/* Value */
@@ -357,6 +361,12 @@ struct CoverageFormat1
     return glyphs->has (glyphArray[index]);
   }
 
+  inline void add_coverage (hb_set_t *glyphs) const {
+    unsigned int count = glyphArray.len;
+    for (unsigned int i = 0; i < count; i++)
+      glyphs->add (glyphArray[i]);
+  }
+
   struct Iter {
     inline void init (const struct CoverageFormat1 &c_) { c = &c_; i = 0; };
     inline bool more (void) { return i < c->glyphArray.len; }
@@ -412,6 +422,12 @@ struct CoverageFormat2
     return false;
   }
 
+  inline void add_coverage (hb_set_t *glyphs) const {
+    unsigned int count = rangeRecord.len;
+    for (unsigned int i = 0; i < count; i++)
+      rangeRecord[i].add_coverage (glyphs);
+  }
+
   struct Iter {
     inline void init (const CoverageFormat2 &c_) {
       c = &c_;
@@ -489,6 +505,14 @@ struct Coverage
     }
   }
 
+  inline void add_coverage (hb_set_t *glyphs) const {
+    switch (u.format) {
+    case 1: u.format1.add_coverage (glyphs); break;
+    case 2: u.format2.add_coverage (glyphs); break;
+    default:                                 break;
+    }
+  }
+
   struct Iter {
     Iter (void) : format (0) {};
     inline void init (const Coverage &c_) {

src/hb-set-private.hh

@@ -60,6 +60,11 @@ struct _hb_set_t
     if (unlikely (g > MAX_G)) return;
     elt (g) |= mask (g);
   }
+  inline void add_range (hb_codepoint_t a, hb_codepoint_t b)
+  {
+    for (unsigned int i = a; i < b + 1; i++)
+      add (i);
+  }
   inline void del (hb_codepoint_t g)
   {
     if (unlikely (g > MAX_G)) return;