harfbuzz: check in harfbuzz-ng, add gyp define to use it

third_party/harfbuzz-ng/src/hb-ot-map-private.hh

+/*
+ * Copyright (C) 2009,2010  Red Hat, Inc.
+ * Copyright (C) 2010  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
+ */
+
+#ifndef HB_OT_MAP_PRIVATE_HH
+#define HB_OT_MAP_PRIVATE_HH
+
+#include "hb-buffer-private.hh"
+
+#include "hb-ot-layout.h"
+
+HB_BEGIN_DECLS
+
+
+#define MAX_FEATURES 100 /* FIXME */
+#define MAX_LOOKUPS 1000 /* FIXME */
+
+static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
+
+struct hb_ot_map_t {
+
+  private:
+
+  struct feature_info_t {
+    hb_tag_t tag;
+    unsigned int seq; /* sequence#, used for stable sorting only */
+    unsigned int max_value;
+    bool global; /* whether the feature applies value to every glyph in the buffer */
+    unsigned int default_value; /* for non-global features, what should the unset glyphs take */
+
+    static int cmp (const feature_info_t *a, const feature_info_t *b)
+    { return (a->tag != b->tag) ?  (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
+  };
+
+  struct feature_map_t {
+    hb_tag_t tag; /* should be first for our bsearch to work */
+    unsigned int index[2]; /* GSUB, GPOS */
+    unsigned int shift;
+    hb_mask_t mask;
+    hb_mask_t _1_mask; /* mask for value=1, for quick access */
+
+    static int cmp (const feature_map_t *a, const feature_map_t *b)
+    { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
+  };
+
+  struct lookup_map_t {
+    unsigned int index;
+    hb_mask_t mask;
+
+    static int cmp (const lookup_map_t *a, const lookup_map_t *b)
+    { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
+  };
+
+  HB_INTERNAL void add_lookups (hb_face_t    *face,
+                                unsigned int  table_index,
+                                unsigned int  feature_index,
+                                hb_mask_t     mask);
+
+
+  public:
+
+  hb_ot_map_t (void) : feature_count (0) {}
+
+  void add_feature (hb_tag_t tag, unsigned int value, bool global)
+  {
+    feature_info_t *info = &feature_infos[feature_count++];
+    info->tag = tag;
+    info->seq = feature_count;
+    info->max_value = value;
+    info->global = global;
+    info->default_value = global ? value : 0;
+  }
+
+  inline void add_bool_feature (hb_tag_t tag, bool global = true)
+  { add_feature (tag, 1, global); }
+
+  HB_INTERNAL void compile (hb_face_t *face,
+                            const hb_segment_properties_t *props);
+
+  inline hb_mask_t get_global_mask (void) const { return global_mask; }
+
+  inline hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const {
+    const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), (hb_compare_func_t) feature_map_t::cmp);
+    if (shift) *shift = map ? map->shift : 0;
+    return map ? map->mask : 0;
+  }
+
+  inline hb_mask_t get_1_mask (hb_tag_t tag) const {
+    const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), (hb_compare_func_t) feature_map_t::cmp);
+    return map ? map->_1_mask : 0;
+  }
+
+  inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const {
+    for (unsigned int i = 0; i < lookup_count[0]; i++)
+      hb_ot_layout_substitute_lookup (face, buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
+  }
+
+  inline void position (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer) const {
+    for (unsigned int i = 0; i < lookup_count[1]; i++)
+      hb_ot_layout_position_lookup (font, face, buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
+  }
+
+  private:
+
+  hb_mask_t global_mask;
+
+  unsigned int feature_count;
+  feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */
+  feature_map_t feature_maps[MAX_FEATURES];
+
+  lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */
+  unsigned int lookup_count[2];
+};
+
+
+
+HB_END_DECLS
+
+#endif /* HB_OT_MAP_PRIVATE_HH */