Move more code around

Buffer var allocation coming into shape

src/hb-buffer-private.hh

@@ -87,6 +87,7 @@ struct _hb_buffer_t {
 
   HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
   HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
+  HB_INTERNAL void deallocate_var_all (void);
 
   inline void allocate_var_8 (unsigned int var_num, unsigned int i, const char *owner)
   { assert (var_num < 2 && i < 4); allocate_var (var_num * 4 + i, 1, owner); }

src/hb-buffer.cc

@@ -34,6 +34,11 @@
 HB_BEGIN_DECLS
 
 
+#ifndef HB_DEBUG_BUFFER
+#define HB_DEBUG_BUFFER (HB_DEBUG+0)
+#endif
+
+
 static hb_buffer_t _hb_buffer_nil = {
   HB_OBJECT_HEADER_STATIC,
 
@@ -388,10 +393,28 @@ hb_buffer_t::reverse_clusters (void)
   reverse_range (start, i);
 }
 
+static inline void
+dump_var_allocation (const hb_buffer_t *buffer)
+{
+  char buf[80];
+  for (unsigned int i = 0; i < 8; i++)
+    buf[i] = '0' + buffer->allocated_var_bytes[i];
+  buf[8] = '\0';
+  DEBUG_MSG (BUFFER, buffer,
+	     "Current var allocation: %s",
+	     buf);
+}
 
 void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const char *owner)
 {
   assert (byte_i < 8 && byte_i + count < 8);
+
+  if (DEBUG (BUFFER))
+    dump_var_allocation (this);
+  DEBUG_MSG (BUFFER, this,
+	     "Allocating var bytes %d..%d for %s",
+	     byte_i, byte_i + count - 1, owner);
+
   for (unsigned int i = byte_i; i < byte_i + count; i++) {
     assert (!allocated_var_bytes[i]);
     allocated_var_bytes[i]++;
@@ -401,13 +424,25 @@ void hb_buffer_t::allocate_var (unsigned int byte_i, unsigned int count, const c
 
 void hb_buffer_t::deallocate_var (unsigned int byte_i, unsigned int count, const char *owner)
 {
+  DEBUG_MSG (BUFFER, this,
+	     "Deallocating var bytes %d..%d for %s",
+	     byte_i, byte_i + count - 1, owner);
+
   assert (byte_i < 8 && byte_i + count < 8);
   for (unsigned int i = byte_i; i < byte_i + count; i++) {
     assert (allocated_var_bytes[i] && allocated_var_owner[i] == owner);
     allocated_var_bytes[i]--;
   }
+
+  if (DEBUG (BUFFER))
+    dump_var_allocation (this);
 }
 
+void hb_buffer_t::deallocate_var_all (void)
+{
+  memset (allocated_var_bytes, 0, sizeof (allocated_var_bytes));
+  memset (allocated_var_owner, 0, sizeof (allocated_var_owner));
+}
 
 /* Public API */
 

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

@@ -1507,6 +1507,7 @@ struct GPOS : GSUBGPOS
 			       hb_mask_t     mask) const
   { return get_lookup (lookup_index).apply_string (font, buffer, mask); }
 
+  static inline void position_start (hb_buffer_t *buffer);
   static inline void position_finish (hb_buffer_t *buffer);
 
   inline bool sanitize (hb_sanitize_context_t *c) {
@@ -1564,6 +1565,12 @@ fix_mark_attachment (hb_glyph_position_t *pos, unsigned int i, hb_direction_t di
     }
 }
 
+void
+GPOS::position_start (hb_buffer_t *buffer)
+{
+  buffer->clear_positions ();
+}
+
 void
 GPOS::position_finish (hb_buffer_t *buffer)
 {

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

@@ -870,6 +870,9 @@ struct GSUB : GSUBGPOS
 				 hb_mask_t     mask) const
   { return get_lookup (lookup_index).apply_string (face, buffer, mask); }
 
+  static inline void substitute_start (hb_buffer_t *buffer);
+  static inline void substitute_finish (hb_buffer_t *buffer);
+
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE ();
     if (unlikely (!GSUBGPOS::sanitize (c))) return false;
@@ -881,6 +884,21 @@ struct GSUB : GSUBGPOS
 };
 
 
+void
+GSUB::substitute_start (hb_buffer_t *buffer)
+{
+  unsigned int count = buffer->len;
+  /* XXX */
+  for (unsigned int i = 0; i < count; i++)
+    buffer->info[i].var1.u32 = buffer->info[i].var2.u32 = 0;
+}
+
+void
+GSUB::substitute_finish (hb_buffer_t *buffer)
+{
+}
+
+
 /* Out-of-class implementation for methods recursing */
 
 inline bool ExtensionSubst::apply (hb_apply_context_t *c) const

src/hb-ot-layout.cc

@@ -443,10 +443,7 @@ hb_ot_layout_has_substitution (hb_face_t *face)
 void
 hb_ot_layout_substitute_start (hb_buffer_t  *buffer)
 {
-  unsigned int count = buffer->len;
-  /* XXX */
-  for (unsigned int i = 0; i < count; i++)
-    buffer->info[i].var1.u32 = buffer->info[i].var2.u32 = 0;
+  GSUB::substitute_start (buffer);
 }
 
 hb_bool_t
@@ -461,6 +458,7 @@ hb_ot_layout_substitute_lookup (hb_face_t    *face,
 void
 hb_ot_layout_substitute_finish (hb_buffer_t  *buffer HB_UNUSED)
 {
+  GSUB::substitute_finish (buffer);
 }
 
 
@@ -477,7 +475,7 @@ hb_ot_layout_has_positioning (hb_face_t *face)
 void
 hb_ot_layout_position_start (hb_buffer_t  *buffer)
 {
-  buffer->clear_positions ();
+  GPOS::position_start (buffer);
 }
 
 hb_bool_t