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1 /*
2  * Copyright © 2009  Red Hat, Inc.
3  * Copyright © 2011  Google, Inc.
4  *
5  *  This is part of HarfBuzz, a text shaping library.
6  *
7  * Permission is hereby granted, without written agreement and without
8  * license or royalty fees, to use, copy, modify, and distribute this
9  * software and its documentation for any purpose, provided that the
10  * above copyright notice and the following two paragraphs appear in
11  * all copies of this software.
12  *
13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17  * DAMAGE.
18  *
19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24  *
25  * Red Hat Author(s): Behdad Esfahbod
26  * Google Author(s): Behdad Esfahbod
27  */
28 
29 #ifndef HB_FACE_PRIVATE_HH
30 #define HB_FACE_PRIVATE_HH
31 
32 #include "hb-private.hh"
33 
34 #include "hb-object-private.hh"
35 #include "hb-shaper-private.hh"
36 #include "hb-shape-plan-private.hh"
37 
38 
39 /*
40  * hb_face_t
41  */
42 
43 struct hb_face_t {
44   hb_object_header_t header;
45   ASSERT_POD ();
46 
47   hb_bool_t immutable;
48 
49   hb_reference_table_func_t  reference_table_func;
50   void                      *user_data;
51   hb_destroy_func_t          destroy;
52 
53   unsigned int index;			/* Face index in a collection, zero-based. */
54   mutable unsigned int upem;		/* Units-per-EM. */
55   mutable unsigned int num_glyphs;	/* Number of glyphs. */
56 
57   struct hb_shaper_data_t shaper_data;	/* Various shaper data. */
58 
59   /* Various non-shaping data. */
60   /* ... */
61 
62   /* Cache */
63   struct plan_node_t {
64     hb_shape_plan_t *shape_plan;
65     plan_node_t *next;
66   } *shape_plans;
67 
68 
reference_tablehb_face_t69   inline hb_blob_t *reference_table (hb_tag_t tag) const
70   {
71     hb_blob_t *blob;
72 
73     if (unlikely (!reference_table_func))
74       return hb_blob_get_empty ();
75 
76     blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
77     if (unlikely (!blob))
78       return hb_blob_get_empty ();
79 
80     return blob;
81   }
82 
get_upemhb_face_t83   inline HB_PURE_FUNC unsigned int get_upem (void) const
84   {
85     if (unlikely (!upem))
86       load_upem ();
87     return upem;
88   }
89 
get_num_glyphshb_face_t90   inline unsigned int get_num_glyphs (void) const
91   {
92     if (unlikely (num_glyphs == (unsigned int) -1))
93       load_num_glyphs ();
94     return num_glyphs;
95   }
96 
97   private:
98   HB_INTERNAL void load_upem (void) const;
99   HB_INTERNAL void load_num_glyphs (void) const;
100 };
101 
102 extern HB_INTERNAL const hb_face_t _hb_face_nil;
103 
104 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
105 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);
106 #include "hb-shaper-list.hh"
107 #undef HB_SHAPER_IMPLEMENT
108 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
109 
110 
111 #endif /* HB_FACE_PRIVATE_HH */
112