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_FONT_PRIVATE_HH
30 : #define HB_FONT_PRIVATE_HH
31 :
32 : #include "hb-private.hh"
33 :
34 : #include "hb-font.h"
35 : #include "hb-object-private.hh"
36 :
37 :
38 :
39 : /*
40 : * hb_font_funcs_t
41 : */
42 :
43 : #define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
44 : HB_FONT_FUNC_IMPLEMENT (glyph) \
45 : HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
46 : HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
47 : HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
48 : HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
49 : HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
50 : HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
51 : HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
52 : HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
53 : /* ^--- Add new callbacks here */
54 :
55 : struct _hb_font_funcs_t {
56 : hb_object_header_t header;
57 :
58 : hb_bool_t immutable;
59 :
60 : /* Don't access these directly. Call hb_font_get_*() instead. */
61 :
62 : struct {
63 : #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
64 : HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
65 : #undef HB_FONT_FUNC_IMPLEMENT
66 : } get;
67 :
68 : struct {
69 : #define HB_FONT_FUNC_IMPLEMENT(name) void *name;
70 : HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
71 : #undef HB_FONT_FUNC_IMPLEMENT
72 : } user_data;
73 :
74 : struct {
75 : #define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
76 : HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
77 : #undef HB_FONT_FUNC_IMPLEMENT
78 : } destroy;
79 : };
80 :
81 :
82 : /*
83 : * hb_face_t
84 : */
85 :
86 : struct _hb_face_t {
87 : hb_object_header_t header;
88 :
89 : hb_bool_t immutable;
90 :
91 : hb_reference_table_func_t reference_table;
92 : void *user_data;
93 : hb_destroy_func_t destroy;
94 :
95 : struct hb_ot_layout_t *ot_layout;
96 :
97 : unsigned int index;
98 : unsigned int upem;
99 : };
100 :
101 :
102 : /*
103 : * hb_font_t
104 : */
105 :
106 : struct _hb_font_t {
107 : hb_object_header_t header;
108 :
109 : hb_bool_t immutable;
110 :
111 : hb_font_t *parent;
112 : hb_face_t *face;
113 :
114 : int x_scale;
115 : int y_scale;
116 :
117 : unsigned int x_ppem;
118 : unsigned int y_ppem;
119 :
120 : hb_font_funcs_t *klass;
121 : void *user_data;
122 : hb_destroy_func_t destroy;
123 :
124 :
125 : /* Convert from font-space to user-space */
126 0 : inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
127 0 : inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }
128 :
129 : /* Convert from parent-font user-space to our user-space */
130 0 : inline hb_position_t parent_scale_x_distance (hb_position_t v) {
131 0 : if (unlikely (parent && parent->x_scale != x_scale))
132 0 : return v * (int64_t) this->x_scale / this->parent->x_scale;
133 0 : return v;
134 : }
135 0 : inline hb_position_t parent_scale_y_distance (hb_position_t v) {
136 0 : if (unlikely (parent && parent->y_scale != y_scale))
137 0 : return v * (int64_t) this->y_scale / this->parent->y_scale;
138 0 : return v;
139 : }
140 0 : inline hb_position_t parent_scale_x_position (hb_position_t v) {
141 0 : return parent_scale_x_distance (v);
142 : }
143 0 : inline hb_position_t parent_scale_y_position (hb_position_t v) {
144 0 : return parent_scale_y_distance (v);
145 : }
146 :
147 0 : inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) {
148 0 : *x = parent_scale_x_distance (*x);
149 0 : *y = parent_scale_y_distance (*y);
150 0 : }
151 0 : inline void parent_scale_position (hb_position_t *x, hb_position_t *y) {
152 0 : *x = parent_scale_x_position (*x);
153 0 : *y = parent_scale_y_position (*y);
154 0 : }
155 :
156 :
157 : private:
158 0 : inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / hb_face_get_upem (this->face); }
159 : };
160 :
161 :
162 :
163 : #endif /* HB_FONT_PRIVATE_HH */
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