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 :
37 :
38 :
39 : enum hb_ot_complex_shaper_t;
40 :
41 : struct hb_ot_shape_plan_t
42 : {
43 : friend struct hb_ot_shape_planner_t;
44 :
45 : hb_ot_map_t map;
46 : hb_ot_complex_shaper_t shaper;
47 :
48 0 : hb_ot_shape_plan_t (void) : map () {}
49 0 : ~hb_ot_shape_plan_t (void) { map.finish (); }
50 :
51 : private:
52 : NO_COPY (hb_ot_shape_plan_t);
53 : };
54 :
55 : struct hb_ot_shape_planner_t
56 : {
57 : hb_ot_map_builder_t map;
58 : hb_ot_complex_shaper_t shaper;
59 :
60 0 : hb_ot_shape_planner_t (void) : map () {}
61 0 : ~hb_ot_shape_planner_t (void) { map.finish (); }
62 :
63 0 : inline void compile (hb_face_t *face,
64 : const hb_segment_properties_t *props,
65 : struct hb_ot_shape_plan_t &plan)
66 : {
67 0 : plan.shaper = shaper;
68 0 : map.compile (face, props, plan.map);
69 0 : }
70 :
71 : private:
72 : NO_COPY (hb_ot_shape_planner_t);
73 : };
74 :
75 :
76 : struct hb_ot_shape_context_t
77 : {
78 : /* Input to hb_ot_shape_execute() */
79 : hb_ot_shape_plan_t *plan;
80 : hb_font_t *font;
81 : hb_face_t *face;
82 : hb_buffer_t *buffer;
83 : const hb_feature_t *user_features;
84 : unsigned int num_user_features;
85 :
86 : /* Transient stuff */
87 : hb_direction_t target_direction;
88 : hb_bool_t applied_substitute_complex;
89 : hb_bool_t applied_position_complex;
90 : };
91 :
92 :
93 : static inline hb_bool_t
94 0 : is_variation_selector (hb_codepoint_t unicode)
95 : {
96 0 : return unlikely ((unicode >= 0x180B && unicode <= 0x180D) || /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
97 : (unicode >= 0xFE00 && unicode <= 0xFE0F) || /* VARIATION SELECTOR-1..16 */
98 : (unicode >= 0xE0100 && unicode <= 0xE01EF)); /* VARIATION SELECTOR-17..256 */
99 : }
100 :
101 : static inline unsigned int
102 0 : _hb_unicode_modified_combining_class (hb_unicode_funcs_t *ufuncs,
103 : hb_codepoint_t unicode)
104 : {
105 0 : int c = hb_unicode_combining_class (ufuncs, unicode);
106 :
107 : /* For Hebrew, we permute the "fixed-position" classes 10-25 into the order
108 : * described in the SBL Hebrew manual http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
109 : * (as recommended by http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html)
110 : */
111 : static const int permuted_hebrew_classes[25 - 10 + 1] = {
112 : /* 10 sheva */ 22,
113 : /* 11 hataf segol */ 15,
114 : /* 12 hataf patah */ 16,
115 : /* 13 hataf qamats */ 17,
116 : /* 14 hiriq */ 23,
117 : /* 15 tsere */ 18,
118 : /* 16 segol */ 19,
119 : /* 17 patah */ 20,
120 : /* 18 qamats */ 21,
121 : /* 19 holam */ 14,
122 : /* 20 qubuts */ 24,
123 : /* 21 dagesh */ 12,
124 : /* 22 meteg */ 25,
125 : /* 23 rafe */ 13,
126 : /* 24 shin dot */ 10,
127 : /* 25 sin dot */ 11,
128 : };
129 :
130 : /* Modify the combining-class to suit Arabic better. See:
131 : * http://unicode.org/faq/normalization.html#8
132 : * http://unicode.org/faq/normalization.html#9
133 : */
134 0 : if (unlikely (hb_in_range<int> (c, 27, 33)))
135 0 : c = c == 33 ? 27 : c + 1;
136 : /* The equivalent fix for Hebrew is more complex,
137 : * see the SBL Hebrew manual.
138 : */
139 0 : else if (unlikely (hb_in_range<int> (c, 10, 25)))
140 0 : c = permuted_hebrew_classes[c - 10];
141 :
142 0 : return c;
143 : }
144 :
145 : static inline void
146 0 : hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
147 : {
148 0 : info->general_category() = hb_unicode_general_category (unicode, info->codepoint);
149 0 : info->combining_class() = _hb_unicode_modified_combining_class (unicode, info->codepoint);
150 0 : }
151 :
152 : HB_INTERNAL void _hb_set_unicode_props (hb_buffer_t *buffer);
153 :
154 : HB_INTERNAL void _hb_ot_shape_normalize (hb_ot_shape_context_t *c);
155 :
156 :
157 : #endif /* HB_OT_SHAPE_PRIVATE_HH */
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