Add m-esr52 at 52.6.0

1 files changed, 744 insertions, 0 deletions

diff --git a/gfx/harfbuzz/src/hb-ft.cc b/gfx/harfbuzz/src/hb-ft.cc
new file mode 100644
index 000000000..f127066a6
--- /dev/null
+++ b/gfx/harfbuzz/src/hb-ft.cc
@@ -0,0 +1,744 @@
+/*
+ * 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
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-private.hh"
+
+#include "hb-ft.h"
+
+#include "hb-font-private.hh"
+
+#include "hb-cache-private.hh" // Maybe use in the future?
+
+#include FT_ADVANCES_H
+#include FT_MULTIPLE_MASTERS_H
+#include FT_TRUETYPE_TABLES_H
+
+
+
+#ifndef HB_DEBUG_FT
+#define HB_DEBUG_FT (HB_DEBUG+0)
+#endif
+
+
+/* TODO:
+ *
+ * In general, this file does a fine job of what it's supposed to do.
+ * There are, however, things that need more work:
+ *
+ *   - I remember seeing FT_Get_Advance() without the NO_HINTING flag to be buggy.
+ *     Have not investigated.
+ *
+ *   - FreeType works in 26.6 mode.  Clients can decide to use that mode, and everything
+ *     would work fine.  However, we also abuse this API for performing in font-space,
+ *     but don't pass the correct flags to FreeType.  We just abuse the no-hinting mode
+ *     for that, such that no rounding etc happens.  As such, we don't set ppem, and
+ *     pass NO_HINTING as load_flags.  Would be much better to use NO_SCALE, and scale
+ *     ourselves, like we do in uniscribe, etc.
+ *
+ *   - We don't handle / allow for emboldening / obliqueing.
+ *
+ *   - In the future, we should add constructors to create fonts in font space?
+ *
+ *   - FT_Load_Glyph() is exteremely costly.  Do something about it?
+ */
+
+
+struct hb_ft_font_t
+{
+  FT_Face ft_face;
+  int load_flags;
+  bool symbol; /* Whether selected cmap is symbol cmap. */
+  bool unref; /* Whether to destroy ft_face when done. */
+};
+
+static hb_ft_font_t *
+_hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref)
+{
+  hb_ft_font_t *ft_font = (hb_ft_font_t *) calloc (1, sizeof (hb_ft_font_t));
+
+  if (unlikely (!ft_font))
+    return NULL;
+
+  ft_font->ft_face = ft_face;
+  ft_font->symbol = symbol;
+  ft_font->unref = unref;
+
+  ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
+
+  return ft_font;
+}
+
+static void
+_hb_ft_face_destroy (FT_Face ft_face)
+{
+  FT_Done_Face (ft_face);
+}
+
+static void
+_hb_ft_font_destroy (hb_ft_font_t *ft_font)
+{
+  if (ft_font->unref)
+    _hb_ft_face_destroy (ft_font->ft_face);
+
+  free (ft_font);
+}
+
+/**
+ * hb_ft_font_set_load_flags:
+ * @font:
+ * @load_flags:
+ *
+ * 
+ *
+ * Since: 1.0.5
+ **/
+void
+hb_ft_font_set_load_flags (hb_font_t *font, int load_flags)
+{
+  if (font->immutable)
+    return;
+
+  if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)
+    return;
+
+  hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;
+
+  ft_font->load_flags = load_flags;
+}
+
+/**
+ * hb_ft_font_get_load_flags:
+ * @font:
+ *
+ * 
+ *
+ * Return value:
+ * Since: 1.0.5
+ **/
+int
+hb_ft_font_get_load_flags (hb_font_t *font)
+{
+  if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)
+    return 0;
+
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;
+
+  return ft_font->load_flags;
+}
+
+FT_Face
+hb_ft_font_get_face (hb_font_t *font)
+{
+  if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)
+    return NULL;
+
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;
+
+  return ft_font->ft_face;
+}
+
+
+
+static hb_bool_t
+hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED,
+			 void *font_data,
+			 hb_codepoint_t unicode,
+			 hb_codepoint_t *glyph,
+			 void *user_data HB_UNUSED)
+{
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+  unsigned int g = FT_Get_Char_Index (ft_font->ft_face, unicode);
+
+  if (unlikely (!g))
+  {
+    if (unlikely (ft_font->symbol) && unicode <= 0x00FFu)
+    {
+      /* For symbol-encoded OpenType fonts, we duplicate the
+       * U+F000..F0FF range at U+0000..U+00FF.  That's what
+       * Windows seems to do, and that's hinted about at:
+       * http://www.microsoft.com/typography/otspec/recom.htm
+       * under "Non-Standard (Symbol) Fonts". */
+      g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode);
+      if (!g)
+	return false;
+    }
+    else
+      return false;
+  }
+
+  *glyph = g;
+  return true;
+}
+
+static hb_bool_t
+hb_ft_get_variation_glyph (hb_font_t *font HB_UNUSED,
+			   void *font_data,
+			   hb_codepoint_t unicode,
+			   hb_codepoint_t variation_selector,
+			   hb_codepoint_t *glyph,
+			   void *user_data HB_UNUSED)
+{
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+  unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector);
+
+  if (unlikely (!g))
+    return false;
+
+  *glyph = g;
+  return true;
+}
+
+static hb_position_t
+hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
+			   void *font_data,
+			   hb_codepoint_t glyph,
+			   void *user_data HB_UNUSED)
+{
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+  FT_Fixed v;
+
+  if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags, &v)))
+    return 0;
+
+  if (font->x_scale < 0)
+    v = -v;
+
+  return (v + (1<<9)) >> 10;
+}
+
+static hb_position_t
+hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
+			   void *font_data,
+			   hb_codepoint_t glyph,
+			   void *user_data HB_UNUSED)
+{
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+  FT_Fixed v;
+
+  if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v)))
+    return 0;
+
+  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_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;
+
+  if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
+    return false;
+
+  /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
+   * have a Y growing upward.  Hence the extra negation. */
+  *x = ft_face->glyph->metrics.horiBearingX -   ft_face->glyph->metrics.vertBearingX;
+  *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY);
+
+  if (font->x_scale < 0)
+    *x = -*x;
+  if (font->y_scale < 0)
+    *y = -*y;
+
+  return true;
+}
+
+static hb_position_t
+hb_ft_get_glyph_h_kerning (hb_font_t *font,
+			   void *font_data,
+			   hb_codepoint_t left_glyph,
+			   hb_codepoint_t right_glyph,
+			   void *user_data HB_UNUSED)
+{
+  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_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,
+			       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;
+
+  if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
+      return false;
+
+  if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
+      return false;
+
+  *x = ft_face->glyph->outline.points[point_index].x;
+  *y = ft_face->glyph->outline.points[point_index].y;
+
+  return true;
+}
+
+static hb_bool_t
+hb_ft_get_glyph_name (hb_font_t *font HB_UNUSED,
+		      void *font_data,
+		      hb_codepoint_t glyph,
+		      char *name, unsigned int size,
+		      void *user_data HB_UNUSED)
+{
+  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
+
+  hb_bool_t ret = !FT_Get_Glyph_Name (ft_font->ft_face, glyph, name, size);
+  if (ret && (size && !*name))
+    ret = false;
+
+  return ret;
+}
+
+static hb_bool_t
+hb_ft_get_glyph_from_name (hb_font_t *font HB_UNUSED,
+			   void *font_data,
+			   const char *name, int len, /* -1 means nul-terminated */
+			   hb_codepoint_t *glyph,
+			   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 (len < 0)
+    *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name);
+  else {
+    /* Make a nul-terminated version. */
+    char buf[128];
+    len = MIN (len, (int) sizeof (buf) - 1);
+    strncpy (buf, name, len);
+    buf[len] = '\0';
+    *glyph = FT_Get_Name_Index (ft_face, buf);
+  }
+
+  if (*glyph == 0)
+  {
+    /* Check whether the given name was actually the name of glyph 0. */
+    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_bool_t
+hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
+			  void *font_data,
+			  hb_font_extents_t *metrics,
+			  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;
+  metrics->ascender = ft_face->size->metrics.ascender;
+  metrics->descender = ft_face->size->metrics.descender;
+  metrics->line_gap = ft_face->size->metrics.height - (ft_face->size->metrics.ascender - ft_face->size->metrics.descender);
+  if (font->y_scale < 0)
+  {
+    metrics->ascender = -metrics->ascender;
+    metrics->descender = -metrics->descender;
+    metrics->line_gap = -metrics->line_gap;
+  }
+  return true;
+}
+
+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)
+{
+retry:
+  hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ft_funcs);
+
+  if (unlikely (!funcs))
+  {
+    funcs = hb_font_funcs_create ();
+
+    hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, NULL, NULL);
+    //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, NULL, NULL);
+    hb_font_funcs_set_nominal_glyph_func (funcs, hb_ft_get_nominal_glyph, NULL, NULL);
+    hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_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
+  };
+
+  bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL;
+
+  hb_font_set_funcs (font,
+		     funcs,
+		     _hb_ft_font_create (ft_face, symbol, 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;
+  FT_ULong  length = 0;
+  FT_Error error;
+
+  /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */
+
+  error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
+  if (error)
+    return NULL;
+
+  buffer = (FT_Byte *) malloc (length);
+  if (buffer == NULL)
+    return NULL;
+
+  error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
+  if (error)
+    return NULL;
+
+  return hb_blob_create ((const char *) buffer, length,
+			 HB_MEMORY_MODE_WRITABLE,
+			 buffer, free);
+}
+
+/**
+ * hb_ft_face_create:
+ * @ft_face: (destroy destroy) (scope notified): 
+ * @destroy:
+ *
+ * 
+ *
+ * Return value: (transfer full): 
+ * Since: 0.9.2
+ **/
+hb_face_t *
+hb_ft_face_create (FT_Face           ft_face,
+		   hb_destroy_func_t destroy)
+{
+  hb_face_t *face;
+
+  if (ft_face->stream->read == NULL) {
+    hb_blob_t *blob;
+
+    blob = hb_blob_create ((const char *) ft_face->stream->base,
+			   (unsigned int) ft_face->stream->size,
+			   HB_MEMORY_MODE_READONLY,
+			   ft_face, destroy);
+    face = hb_face_create (blob, ft_face->face_index);
+    hb_blob_destroy (blob);
+  } else {
+    face = hb_face_create_for_tables (reference_table, ft_face, destroy);
+  }
+
+  hb_face_set_index (face, ft_face->face_index);
+  hb_face_set_upem (face, ft_face->units_per_EM);
+
+  return face;
+}
+
+/**
+ * hb_ft_face_create_referenced:
+ * @ft_face:
+ *
+ * 
+ *
+ * Return value: (transfer full): 
+ * Since: 0.9.38
+ **/
+hb_face_t *
+hb_ft_face_create_referenced (FT_Face ft_face)
+{
+  FT_Reference_Face (ft_face);
+  return hb_ft_face_create (ft_face, (hb_destroy_func_t) _hb_ft_face_destroy);
+}
+
+static void
+hb_ft_face_finalize (FT_Face ft_face)
+{
+  hb_face_destroy ((hb_face_t *) ft_face->generic.data);
+}
+
+/**
+ * hb_ft_face_create_cached:
+ * @ft_face: 
+ *
+ * 
+ *
+ * Return value: (transfer full): 
+ * Since: 0.9.2
+ **/
+hb_face_t *
+hb_ft_face_create_cached (FT_Face ft_face)
+{
+  if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
+  {
+    if (ft_face->generic.finalizer)
+      ft_face->generic.finalizer (ft_face);
+
+    ft_face->generic.data = hb_ft_face_create (ft_face, NULL);
+    ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
+  }
+
+  return hb_face_reference ((hb_face_t *) ft_face->generic.data);
+}
+
+
+/**
+ * hb_ft_font_create:
+ * @ft_face: (destroy destroy) (scope notified): 
+ * @destroy:
+ *
+ * 
+ *
+ * Return value: (transfer full): 
+ * Since: 0.9.2
+ **/
+hb_font_t *
+hb_ft_font_create (FT_Face           ft_face,
+		   hb_destroy_func_t destroy)
+{
+  hb_font_t *font;
+  hb_face_t *face;
+
+  face = hb_ft_face_create (ft_face, destroy);
+  font = hb_font_create (face);
+  hb_face_destroy (face);
+  _hb_ft_font_set_funcs (font, ft_face, false);
+  hb_font_set_scale (font,
+		     (int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16),
+		     (int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16));
+#if 0 /* hb-ft works in no-hinting model */
+  hb_font_set_ppem (font,
+		    ft_face->size->metrics.x_ppem,
+		    ft_face->size->metrics.y_ppem);
+#endif
+
+#ifdef HAVE_FT_GET_VAR_BLEND_COORDINATES
+  FT_MM_Var *mm_var = NULL;
+  if (!FT_Get_MM_Var (ft_face, &mm_var))
+  {
+    FT_Fixed coords[mm_var->num_axis];
+    int hbCoords[mm_var->num_axis];
+    if (!FT_Get_Var_Blend_Coordinates (ft_face, mm_var->num_axis, coords))
+    {
+      for (int i = 0; i < mm_var->num_axis; ++i)
+	hbCoords[i] = coords[i] >> 2;
+
+      hb_font_set_var_coords_normalized (font, hbCoords, mm_var->num_axis);
+    }
+  }
+  free (mm_var);
+#endif
+
+  return font;
+}
+
+/**
+ * hb_ft_font_create_referenced:
+ * @ft_face:
+ *
+ * 
+ *
+ * Return value: (transfer full): 
+ * Since: 0.9.38
+ **/
+hb_font_t *
+hb_ft_font_create_referenced (FT_Face ft_face)
+{
+  FT_Reference_Face (ft_face);
+  return hb_ft_font_create (ft_face, (hb_destroy_func_t) _hb_ft_face_destroy);
+}
+
+
+/* Thread-safe, lock-free, FT_Library */
+
+static FT_Library ft_library;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_ft_library (void)
+{
+  FT_Done_FreeType (ft_library);
+}
+#endif
+
+static FT_Library
+get_ft_library (void)
+{
+retry:
+  FT_Library library = (FT_Library) hb_atomic_ptr_get (&ft_library);
+
+  if (unlikely (!library))
+  {
+    /* Not found; allocate one. */
+    if (FT_Init_FreeType (&library))
+      return NULL;
+
+    if (!hb_atomic_ptr_cmpexch (&ft_library, NULL, library)) {
+      FT_Done_FreeType (library);
+      goto retry;
+    }
+
+#ifdef HB_USE_ATEXIT
+    atexit (free_ft_library); /* First person registers atexit() callback. */
+#endif
+  }
+
+  return library;
+}
+
+static void
+_release_blob (FT_Face ft_face)
+{
+  hb_blob_destroy ((hb_blob_t *) ft_face->generic.data);
+}
+
+void
+hb_ft_font_set_funcs (hb_font_t *font)
+{
+  hb_blob_t *blob = hb_face_reference_blob (font->face);
+  unsigned int blob_length;
+  const char *blob_data = hb_blob_get_data (blob, &blob_length);
+  if (unlikely (!blob_length))
+    DEBUG_MSG (FT, font, "Font face has empty blob");
+
+  FT_Face ft_face = NULL;
+  FT_Error err = FT_New_Memory_Face (get_ft_library (),
+				     (const FT_Byte *) blob_data,
+				     blob_length,
+				     hb_face_get_index (font->face),
+				     &ft_face);
+
+  if (unlikely (err)) {
+    hb_blob_destroy (blob);
+    DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed");
+    return;
+  }
+
+  if (FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE))
+    FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL);
+
+  FT_Set_Char_Size (ft_face,
+		    abs (font->x_scale), abs (font->y_scale),
+		    0, 0);
+#if 0
+		    font->x_ppem * 72 * 64 / font->x_scale,
+		    font->y_ppem * 72 * 64 / font->y_scale);
+#endif
+  if (font->x_scale < 0 || font->y_scale < 0)
+  {
+    FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0,
+			  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);
+}