Roll HarfBuzz to 1.1.1

third_party/harfbuzz-ng/src/hb-ft.cc

 /*
  * Copyright © 2009  Red Hat, Inc.
  * Copyright © 2009  Keith Stribley
  * Copyright © 2015  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
@@ skipping 199 matching lines @@
 
   if (font->y_scale < 0)
     v = -v;
 
   /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
    * have a Y growing upward.  Hence the extra negation. */
   return (-v + (1<<9)) >> 10;
 }
 
 static hb_bool_t
-hb_ft_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
-                          void *font_data HB_UNUSED,
-                          hb_codepoint_t glyph HB_UNUSED,
-                          hb_position_t *x HB_UNUSED,
-                          hb_position_t *y HB_UNUSED,
-                          void *user_data HB_UNUSED)
-{
-  /* We always work in the horizontal coordinates. */
-  return true;
-}
-
-static hb_bool_t
 hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
                           void *font_data,
                           hb_codepoint_t glyph,
                           hb_position_t *x,
                           hb_position_t *y,
                           void *user_data HB_UNUSED)
 {
   const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
   FT_Face ft_face = ft_font->ft_face;
 
@@ skipping 23 matching lines @@
   const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
   FT_Vector kerningv;
 
   FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED;
   if (FT_Get_Kerning (ft_font->ft_face, left_glyph, right_glyph, mode, &kerningv))
     return 0;
 
   return kerningv.x;
 }
 
-static hb_position_t
-hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
-                           void *font_data HB_UNUSED,
-                           hb_codepoint_t top_glyph HB_UNUSED,
-                           hb_codepoint_t bottom_glyph HB_UNUSED,
-                           void *user_data HB_UNUSED)
-{
-  /* FreeType API doesn't support vertical kerning */
-  return 0;
-}
-
 static hb_bool_t
 hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
                          void *font_data,
                          hb_codepoint_t glyph,
                          hb_glyph_extents_t *extents,
                          void *user_data HB_UNUSED)
 {
   const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
   FT_Face ft_face = ft_font->ft_face;
 
   if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
     return false;
 
   extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
   extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
   extents->width = ft_face->glyph->metrics.width;
   extents->height = -ft_face->glyph->metrics.height;
+  if (font->x_scale < 0)
+  {
+    extents->x_bearing = -extents->x_bearing;
+    extents->width = -extents->width;
+  }
+  if (font->y_scale < 0)
+  {
+    extents->y_bearing = -extents->y_bearing;
+    extents->height = -extents->height;
+  }
   return true;
 }
 
 static hb_bool_t
 hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
                                void *font_data,
                                hb_codepoint_t glyph,
                                unsigned int point_index,
                                hb_position_t *x,
                                hb_position_t *y,
@@ skipping 60 matching lines @@
     char buf[128];
     if (!FT_Get_Glyph_Name(ft_face, 0, buf, sizeof (buf)) &&
         len < 0 ? !strcmp (buf, name) : !strncmp (buf, name, len))
       return true;
   }
 
   return *glyph != 0;
 }
 
 
+static hb_font_funcs_t *static_ft_funcs = NULL;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_ft_funcs (void)
+{
+  hb_font_funcs_destroy (static_ft_funcs);
+}
+#endif
+
 static void
 _hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref)
 {
-  static const hb_font_funcs_t ft_ffuncs = {
-    HB_OBJECT_HEADER_STATIC,
+retry:
+  hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ft_funcs);
 
-    true, /* immutable */
+  if (unlikely (!funcs))
+  {
+    funcs = hb_font_funcs_create ();
 
-    {
-#define HB_FONT_FUNC_IMPLEMENT(name) hb_ft_get_##name,
-      HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
-#undef HB_FONT_FUNC_IMPLEMENT
+    hb_font_funcs_set_glyph_func (funcs, hb_ft_get_glyph, NULL, NULL);
+    hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ft_get_glyph_h_advance, NULL, NULL);
+    hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, NULL, NULL);
+    //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ft_get_glyph_h_origin, NULL, NULL);
+    hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ft_get_glyph_v_origin, NULL, NULL);
+    hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ft_get_glyph_h_kerning, NULL, NULL);
+    //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ft_get_glyph_v_kerning, NULL, NULL);
+    hb_font_funcs_set_glyph_extents_func (funcs, hb_ft_get_glyph_extents, NULL, NULL);
+    hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ft_get_glyph_contour_point, NULL, NULL);
+    hb_font_funcs_set_glyph_name_func (funcs, hb_ft_get_glyph_name, NULL, NULL);
+    hb_font_funcs_set_glyph_from_name_func (funcs, hb_ft_get_glyph_from_name, NULL, NULL);
+
+    hb_font_funcs_make_immutable (funcs);
+
+    if (!hb_atomic_ptr_cmpexch (&static_ft_funcs, NULL, funcs)) {
+      hb_font_funcs_destroy (funcs);
+      goto retry;
     }
+
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_ft_funcs); /* First person registers atexit() callback. */
+#endif
   };
 
   hb_font_set_funcs (font,
-                     const_cast<hb_font_funcs_t *> (&ft_ffuncs),
+                     funcs,
                      _hb_ft_font_create (ft_face, unref),
                      (hb_destroy_func_t) _hb_ft_font_destroy);
 }
 
 
 static hb_blob_t *
 reference_table  (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
 {
   FT_Face ft_face = (FT_Face) user_data;
   FT_Byte *buffer;
@@ skipping 231 matching lines @@
                           0, font->y_scale < 0 ? -1 : +1};
     FT_Set_Transform (ft_face, &matrix, NULL);
   }
 
   ft_face->generic.data = blob;
   ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;
 
   _hb_ft_font_set_funcs (font, ft_face, true);
   hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
 }