Roll HarfBuzz to 1.1.1

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

 /*
  * Copyright © 2009  Red Hat, Inc.
  * Copyright © 2012  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
  * above copyright notice and the following two paragraphs appear in
@@ skipping 27 matching lines @@
 #include "hb-cache-private.hh"
 
 #include <string.h>
 
 
 /*
  * hb_font_funcs_t
  */
 
 static hb_bool_t
-hb_font_get_glyph_nil (hb_font_t *font,
+hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
                        void *font_data HB_UNUSED,
                        hb_codepoint_t unicode,
                        hb_codepoint_t variation_selector,
                        hb_codepoint_t *glyph,
                        void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent->get_glyph (unicode, variation_selector, glyph);
-
   *glyph = 0;
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_parent (hb_font_t *font,
+                          void *font_data HB_UNUSED,
+                          hb_codepoint_t unicode,
+                          hb_codepoint_t variation_selector,
+                          hb_codepoint_t *glyph,
+                          void *user_data HB_UNUSED)
+{
+  return font->parent->get_glyph (unicode, variation_selector, glyph);
+}
 
 static hb_position_t
-hb_font_get_glyph_h_advance_nil (hb_font_t *font,
+hb_font_get_glyph_h_advance_nil (hb_font_t *font HB_UNUSED,
                                  void *font_data HB_UNUSED,
                                  hb_codepoint_t glyph,
                                  void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
-
   return font->x_scale;
 }
+static hb_position_t
+hb_font_get_glyph_h_advance_parent (hb_font_t *font,
+                                    void *font_data HB_UNUSED,
+                                    hb_codepoint_t glyph,
+                                    void *user_data HB_UNUSED)
+{
+  return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
+}
 
 static hb_position_t
-hb_font_get_glyph_v_advance_nil (hb_font_t *font,
+hb_font_get_glyph_v_advance_nil (hb_font_t *font HB_UNUSED,
                                  void *font_data HB_UNUSED,
                                  hb_codepoint_t glyph,
                                  void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
-
   return font->y_scale;
 }
+static hb_position_t
+hb_font_get_glyph_v_advance_parent (hb_font_t *font,
+                                    void *font_data HB_UNUSED,
+                                    hb_codepoint_t glyph,
+                                    void *user_data HB_UNUSED)
+{
+  return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
+}
 
 static hb_bool_t
-hb_font_get_glyph_h_origin_nil (hb_font_t *font,
+hb_font_get_glyph_h_origin_nil (hb_font_t *font HB_UNUSED,
                                 void *font_data HB_UNUSED,
                                 hb_codepoint_t glyph,
                                 hb_position_t *x,
                                 hb_position_t *y,
                                 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
-    if (ret)
-      font->parent_scale_position (x, y);
-    return ret;
-  }
-
   *x = *y = 0;
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_h_origin_parent (hb_font_t *font,
+                                   void *font_data HB_UNUSED,
+                                   hb_codepoint_t glyph,
+                                   hb_position_t *x,
+                                   hb_position_t *y,
+                                   void *user_data HB_UNUSED)
+{
+  hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
+  if (ret)
+    font->parent_scale_position (x, y);
+  return ret;
+}
 
 static hb_bool_t
-hb_font_get_glyph_v_origin_nil (hb_font_t *font,
+hb_font_get_glyph_v_origin_nil (hb_font_t *font HB_UNUSED,
                                 void *font_data HB_UNUSED,
                                 hb_codepoint_t glyph,
                                 hb_position_t *x,
                                 hb_position_t *y,
                                 void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
-    if (ret)
-      font->parent_scale_position (x, y);
-    return ret;
-  }
-
   *x = *y = 0;
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_v_origin_parent (hb_font_t *font,
+                                   void *font_data HB_UNUSED,
+                                   hb_codepoint_t glyph,
+                                   hb_position_t *x,
+                                   hb_position_t *y,
+                                   void *user_data HB_UNUSED)
+{
+  hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
+  if (ret)
+    font->parent_scale_position (x, y);
+  return ret;
+}
 
 static hb_position_t
-hb_font_get_glyph_h_kerning_nil (hb_font_t *font,
+hb_font_get_glyph_h_kerning_nil (hb_font_t *font HB_UNUSED,
                                  void *font_data HB_UNUSED,
                                  hb_codepoint_t left_glyph,
                                  hb_codepoint_t right_glyph,
                                  void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
-
   return 0;
 }
+static hb_position_t
+hb_font_get_glyph_h_kerning_parent (hb_font_t *font,
+                                    void *font_data HB_UNUSED,
+                                    hb_codepoint_t left_glyph,
+                                    hb_codepoint_t right_glyph,
+                                    void *user_data HB_UNUSED)
+{
+  return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
+}
 
 static hb_position_t
-hb_font_get_glyph_v_kerning_nil (hb_font_t *font,
+hb_font_get_glyph_v_kerning_nil (hb_font_t *font HB_UNUSED,
                                  void *font_data HB_UNUSED,
                                  hb_codepoint_t top_glyph,
                                  hb_codepoint_t bottom_glyph,
                                  void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
-
   return 0;
 }
+static hb_position_t
+hb_font_get_glyph_v_kerning_parent (hb_font_t *font,
+                                    void *font_data HB_UNUSED,
+                                    hb_codepoint_t top_glyph,
+                                    hb_codepoint_t bottom_glyph,
+                                    void *user_data HB_UNUSED)
+{
+  return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
+}
 
 static hb_bool_t
-hb_font_get_glyph_extents_nil (hb_font_t *font,
+hb_font_get_glyph_extents_nil (hb_font_t *font HB_UNUSED,
                                void *font_data HB_UNUSED,
                                hb_codepoint_t glyph,
                                hb_glyph_extents_t *extents,
                                void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
-    if (ret) {
-      font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
-      font->parent_scale_distance (&extents->width, &extents->height);
-    }
-    return ret;
-  }
-
   memset (extents, 0, sizeof (*extents));
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_extents_parent (hb_font_t *font,
+                                  void *font_data HB_UNUSED,
+                                  hb_codepoint_t glyph,
+                                  hb_glyph_extents_t *extents,
+                                  void *user_data HB_UNUSED)
+{
+  hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
+  if (ret) {
+    font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
+    font->parent_scale_distance (&extents->width, &extents->height);
+  }
+  return ret;
+}
 
 static hb_bool_t
-hb_font_get_glyph_contour_point_nil (hb_font_t *font,
+hb_font_get_glyph_contour_point_nil (hb_font_t *font HB_UNUSED,
                                      void *font_data HB_UNUSED,
                                      hb_codepoint_t glyph,
                                      unsigned int point_index,
                                      hb_position_t *x,
                                      hb_position_t *y,
                                      void *user_data HB_UNUSED)
 {
-  if (font->parent) {
-    hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
-    if (ret)
-      font->parent_scale_position (x, y);
-    return ret;
-  }
-
   *x = *y = 0;
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_contour_point_parent (hb_font_t *font,
+                                        void *font_data HB_UNUSED,
+                                        hb_codepoint_t glyph,
+                                        unsigned int point_index,
+                                        hb_position_t *x,
+                                        hb_position_t *y,
+                                        void *user_data HB_UNUSED)
+{
+  hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
+  if (ret)
+    font->parent_scale_position (x, y);
+  return ret;
+}
 
 static hb_bool_t
-hb_font_get_glyph_name_nil (hb_font_t *font,
+hb_font_get_glyph_name_nil (hb_font_t *font HB_UNUSED,
                             void *font_data HB_UNUSED,
                             hb_codepoint_t glyph,
                             char *name, unsigned int size,
                             void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent->get_glyph_name (glyph, name, size);
-
   if (size) *name = '\0';
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_name_parent (hb_font_t *font,
+                               void *font_data HB_UNUSED,
+                               hb_codepoint_t glyph,
+                               char *name, unsigned int size,
+                               void *user_data HB_UNUSED)
+{
+  return font->parent->get_glyph_name (glyph, name, size);
+}
 
 static hb_bool_t
-hb_font_get_glyph_from_name_nil (hb_font_t *font,
+hb_font_get_glyph_from_name_nil (hb_font_t *font HB_UNUSED,
                                  void *font_data HB_UNUSED,
                                  const char *name, int len, /* -1 means nul-terminated */
                                  hb_codepoint_t *glyph,
                                  void *user_data HB_UNUSED)
 {
-  if (font->parent)
-    return font->parent->get_glyph_from_name (name, len, glyph);
-
   *glyph = 0;
   return false;
 }
+static hb_bool_t
+hb_font_get_glyph_from_name_parent (hb_font_t *font,
+                                    void *font_data HB_UNUSED,
+                                    const char *name, int len, /* -1 means nul-terminated */
+                                    hb_codepoint_t *glyph,
+                                    void *user_data HB_UNUSED)
+{
+  return font->parent->get_glyph_from_name (name, len, glyph);
+}
 
 
 static const hb_font_funcs_t _hb_font_funcs_nil = {
   HB_OBJECT_HEADER_STATIC,
 
   true, /* immutable */
 
   {
-#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_nil,
+#define HB_FONT_FUNC_IMPLEMENT(name) NULL,
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
+  },
+  {
+#define HB_FONT_FUNC_IMPLEMENT(name) NULL,
+    HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+  },
+  {
+    {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_nil,
+      HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+    }
+  }
+};
+static const hb_font_funcs_t _hb_font_funcs_parent = {
+  HB_OBJECT_HEADER_STATIC,
+
+  true, /* immutable */
+
+  {
+#define HB_FONT_FUNC_IMPLEMENT(name) NULL,
+    HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+  },
+  {
+#define HB_FONT_FUNC_IMPLEMENT(name) NULL,
+    HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+  },
+  {
+    {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_parent,
+      HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+    }
   }
 };
 
 
 /**
  * hb_font_funcs_create: (Xconstructor)
  *
  * 
  *
  * Return value: (transfer full): 
  *
  * Since: 0.9.2
  **/
 hb_font_funcs_t *
 hb_font_funcs_create (void)
 {
   hb_font_funcs_t *ffuncs;
 
   if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
     return hb_font_funcs_get_empty ();
 
-  ffuncs->get = _hb_font_funcs_nil.get;
+  ffuncs->get = _hb_font_funcs_parent.get;
 
   return ffuncs;
 }
 
 /**
  * hb_font_funcs_get_empty:
  *
  * 
  *
  * Return value: (transfer full): 
  *
  * Since: 0.9.2
  **/
 hb_font_funcs_t *
 hb_font_funcs_get_empty (void)
 {
-  return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil);
+  return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_parent);
 }
 
 /**
  * hb_font_funcs_reference: (skip)
  * @ffuncs: font functions.
  *
  * 
  *
  * Return value: 
  *
@@ skipping 114 matching lines @@
   if (ffuncs->immutable) {                                               \
     if (destroy)                                                         \
       destroy (user_data);                                               \
     return;                                                              \
   }                                                                      \
                                                                          \
   if (ffuncs->destroy.name)                                              \
     ffuncs->destroy.name (ffuncs->user_data.name);                       \
                                                                          \
   if (func) {                                                            \
-    ffuncs->get.name = func;                                             \
+    ffuncs->get.f.name = func;                                           \
     ffuncs->user_data.name = user_data;                                  \
     ffuncs->destroy.name = destroy;                                      \
   } else {                                                               \
-    ffuncs->get.name = hb_font_get_##name##_nil;                         \
+    ffuncs->get.f.name = hb_font_get_##name##_parent;                    \
     ffuncs->user_data.name = NULL;                                       \
     ffuncs->destroy.name = NULL;                                         \
   }                                                                      \
 }
 
 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
 
+bool
+hb_font_t::has_func (unsigned int i)
+{
+  if (parent && parent != hb_font_get_empty () && parent->has_func (i))
+    return true;
+  return this->klass->get.array[i] != _hb_font_funcs_parent.get.array[i];
+}
 
 /* Public getters */
 
 /**
  * hb_font_get_glyph:
  * @font: a font.
  * @unicode: 
  * @variation_selector: 
  * @glyph: (out): 
  *
@@ skipping 427 matching lines @@
 hb_font_create (hb_face_t *face)
 {
   hb_font_t *font;
 
   if (unlikely (!face))
     face = hb_face_get_empty ();
   if (!(font = hb_object_create<hb_font_t> ()))
     return hb_font_get_empty ();
 
   hb_face_make_immutable (face);
+  font->parent = hb_font_get_empty ();
   font->face = hb_face_reference (face);
   font->klass = hb_font_funcs_get_empty ();
 
   font->x_scale = font->y_scale = hb_face_get_upem (face);
 
   return font;
 }
 
 /**
  * hb_font_create_sub_font:
@@ skipping 39 matching lines @@
 hb_font_get_empty (void)
 {
   static const hb_font_t _hb_font_nil = {
     HB_OBJECT_HEADER_STATIC,
 
     true, /* immutable */
 
     NULL, /* parent */
     const_cast<hb_face_t *> (&_hb_face_nil),
 
-    0, /* x_scale */
-    0, /* y_scale */
+    1000, /* x_scale */
+    1000, /* y_scale */
 
     0, /* x_ppem */
     0, /* y_ppem */
 
     const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil), /* klass */
     NULL, /* user_data */
     NULL, /* destroy */
 
     {
 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INVALID,
@@ skipping 325 matching lines @@
  * Since: 0.9.2
  **/
 void
 hb_font_get_ppem (hb_font_t *font,
                   unsigned int *x_ppem,
                   unsigned int *y_ppem)
 {
   if (x_ppem) *x_ppem = font->x_ppem;
   if (y_ppem) *y_ppem = font->y_ppem;
 }