Add fallback shaper

src/hb-fallback-shape.cc

@@ -37,7 +37,26 @@ hb_fallback_shape (hb_font_t          *font,
 {
   buffer->guess_properties ();
 
-  return TRUE;
-}
+  unsigned int count = buffer->len;
+
+  for (unsigned int i = 0; i < count; i++)
+    hb_font_get_glyph (font, buffer->info[i].codepoint, 0, &buffer->info[i].codepoint);
+
+  buffer->clear_positions ();
 
+  for (unsigned int i = 0; i < count; i++) {
+    hb_font_get_glyph_advance_for_direction (font, buffer->info[i].codepoint,
+					     buffer->props.direction,
+					     &buffer->pos[i].x_advance,
+					     &buffer->pos[i].y_advance);
+    hb_font_subtract_glyph_origin_for_direction (font, buffer->info[i].codepoint,
+						 buffer->props.direction,
+						 &buffer->pos[i].x_offset,
+						 &buffer->pos[i].y_offset);
+  }
 
+  if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
+    hb_buffer_reverse (buffer);
+
+  return TRUE;
+}