Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

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

+/*
+ * Copyright © 2011  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.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-open-type-private.hh"
+
+#include "hb-ot-hhea-table.hh"
+#include "hb-ot-hmtx-table.hh"
+
+#include "hb-font-private.hh"
+#include "hb-blob.h"
+
+#include <string.h>
+
+
+
+#if 0
+struct hb_tt_font_t
+{
+  const struct hhea *hhea;
+  hb_blob_t *hhea_blob;
+};
+
+
+static hb_tt_font_t *
+_hb_tt_font_create (hb_font_t *font)
+{
+  /* TODO Remove this object altogether */
+  hb_tt_font_t *tt = (hb_tt_font_t *) calloc (1, sizeof (hb_tt_font_t));
+
+  tt->hhea_blob = Sanitizer<hhea>::sanitize (hb_face_reference_table (font->face, HB_OT_TAG_hhea));
+  tt->hhea = Sanitizer<hhea>::lock_instance (tt->hhea_blob);
+
+  return tt;
+}
+
+static void
+_hb_tt_font_destroy (hb_tt_font_t *tt)
+{
+  hb_blob_destroy (tt->hhea_blob);
+
+  free (tt);
+}
+
+static inline const hhea&
+_get_hhea (hb_face_t *face)
+{
+//  return likely (face->tt && face->tt->hhea) ? *face->tt->hhea : Null(hhea);
+}
+
+
+/*
+ * hb_tt_font_funcs_t
+ */
+
+static hb_bool_t
+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 hb_font_get_glyph (font->parent, unicode, variation_selector, glyph);
+
+  *glyph = 0;
+  return FALSE;
+}
+
+static hb_position_t
+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 (hb_font_get_glyph_h_advance (font->parent, glyph));
+
+  return font->x_scale;
+}
+
+static hb_position_t
+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 (hb_font_get_glyph_v_advance (font->parent, glyph));
+
+  return font->y_scale;
+}
+
+static hb_bool_t
+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 = hb_font_get_glyph_h_origin (font->parent,
+                                                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_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 = hb_font_get_glyph_v_origin (font->parent,
+                                                glyph,
+                                                x, y);
+    if (ret)
+      font->parent_scale_position (x, y);
+    return ret;
+  }
+
+  *x = *y = 0;
+  return FALSE;
+}
+
+static hb_position_t
+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 (hb_font_get_glyph_h_kerning (font->parent, left_glyph, right_glyph));
+
+  return 0;
+}
+
+static hb_position_t
+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 (hb_font_get_glyph_v_kerning (font->parent, top_glyph, bottom_glyph));
+
+  return 0;
+}
+
+static hb_bool_t
+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 = hb_font_get_glyph_extents (font->parent,
+                                               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_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 = hb_font_get_glyph_contour_point (font->parent,
+                                                     glyph, point_index,
+                                                     x, y);
+    if (ret)
+      font->parent_scale_position (x, y);
+    return ret;
+  }
+
+  *x = *y = 0;
+  return FALSE;
+}
+
+
+static 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,
+    HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+  }
+};
+#endif
+