hb-ot-shape-private.hh revision 45412523dc295cb5ee12e096bfacb282cc925843 
1/*
2 * Copyright © 2010  Google, Inc.
3 *
4 *  This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#ifndef HB_OT_SHAPE_PRIVATE_HH
28#define HB_OT_SHAPE_PRIVATE_HH
29
30#include "hb-private.hh"
31
32#include "hb-ot-shape.h"
33
34#include "hb-ot-map-private.hh"
35#include "hb-ot-shape-complex-private.hh"
36
37HB_BEGIN_DECLS
38
39
40enum hb_ot_complex_shaper_t;
41
42struct hb_ot_shape_plan_t
43{
44  friend struct hb_ot_shape_planner_t;
45
46  hb_ot_map_t map;
47  hb_ot_complex_shaper_t shaper;
48
49  hb_ot_shape_plan_t (void) : map () {}
50  ~hb_ot_shape_plan_t (void) { map.finish (); }
51
52  private:
53  NO_COPY (hb_ot_shape_plan_t);
54};
55
56struct hb_ot_shape_planner_t
57{
58  hb_ot_map_builder_t map;
59  hb_ot_complex_shaper_t shaper;
60
61  hb_ot_shape_planner_t (void) : map () {}
62  ~hb_ot_shape_planner_t (void) { map.finish (); }
63
64  inline void compile (hb_face_t *face,
65		       const hb_segment_properties_t *props,
66		       struct hb_ot_shape_plan_t &plan)
67  {
68    plan.shaper = shaper;
69    map.compile (face, props, plan.map);
70  }
71
72  private:
73  NO_COPY (hb_ot_shape_planner_t);
74};
75
76
77struct hb_ot_shape_context_t
78{
79  /* Input to hb_ot_shape_execute() */
80  hb_ot_shape_plan_t *plan;
81  hb_font_t *font;
82  hb_face_t *face;
83  hb_buffer_t  *buffer;
84  const hb_feature_t *user_features;
85  unsigned int        num_user_features;
86
87  /* Transient stuff */
88  hb_direction_t target_direction;
89  hb_bool_t applied_substitute_complex;
90  hb_bool_t applied_position_complex;
91};
92
93
94static inline hb_bool_t
95is_variation_selector (hb_codepoint_t unicode)
96{
97  return unlikely ((unicode >=  0x180B && unicode <=  0x180D) || /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
98		   (unicode >=  0xFE00 && unicode <=  0xFE0F) || /* VARIATION SELECTOR-1..16 */
99		   (unicode >= 0xE0100 && unicode <= 0xE01EF));  /* VARIATION SELECTOR-17..256 */
100}
101
102static inline void
103hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
104{
105  info->general_category() = hb_unicode_general_category (unicode, info->codepoint);
106  info->combining_class() = hb_unicode_combining_class (unicode, info->codepoint);
107}
108
109HB_INTERNAL void _hb_ot_shape_normalize (hb_ot_shape_context_t *c);
110
111HB_END_DECLS
112
113#endif /* HB_OT_SHAPE_PRIVATE_HH */
114