1/*
2 * Copyright © 2018 Adobe 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 * Adobe Author(s): Michiharu Ariza
25 */
26
27#include "hb.hh"
28
29#ifndef HB_NO_OT_FONT_CFF
30
31#include "hb-ot-cff2-table.hh"
32#include "hb-cff2-interp-cs.hh"
33
34using namespace CFF;
35
36struct cff2_extents_param_t
37{
38 void init ()
39 {
40 path_open = false;
41 min_x.set_int (INT_MAX);
42 min_y.set_int (INT_MAX);
43 max_x.set_int (INT_MIN);
44 max_y.set_int (INT_MIN);
45 }
46
47 void start_path () { path_open = true; }
48 void end_path () { path_open = false; }
49 bool is_path_open () const { return path_open; }
50
51 void update_bounds (const point_t &pt)
52 {
53 if (pt.x < min_x) min_x = pt.x;
54 if (pt.x > max_x) max_x = pt.x;
55 if (pt.y < min_y) min_y = pt.y;
56 if (pt.y > max_y) max_y = pt.y;
57 }
58
59 bool path_open;
60 number_t min_x;
61 number_t min_y;
62 number_t max_x;
63 number_t max_y;
64};
65
66struct cff2_path_procs_extents_t : path_procs_t<cff2_path_procs_extents_t, cff2_cs_interp_env_t, cff2_extents_param_t>
67{
68 static void moveto (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt)
69 {
70 param.end_path ();
71 env.moveto (pt);
72 }
73
74 static void line (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1)
75 {
76 if (!param.is_path_open ())
77 {
78 param.start_path ();
79 param.update_bounds (env.get_pt ());
80 }
81 env.moveto (pt1);
82 param.update_bounds (env.get_pt ());
83 }
84
85 static void curve (cff2_cs_interp_env_t &env, cff2_extents_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
86 {
87 if (!param.is_path_open ())
88 {
89 param.start_path ();
90 param.update_bounds (env.get_pt ());
91 }
92 /* include control points */
93 param.update_bounds (pt1);
94 param.update_bounds (pt2);
95 env.moveto (pt3);
96 param.update_bounds (env.get_pt ());
97 }
98};
99
100struct cff2_cs_opset_extents_t : cff2_cs_opset_t<cff2_cs_opset_extents_t, cff2_extents_param_t, cff2_path_procs_extents_t> {};
101
102bool OT::cff2::accelerator_t::get_extents (hb_font_t *font,
103 hb_codepoint_t glyph,
104 hb_glyph_extents_t *extents) const
105{
106#ifdef HB_NO_OT_FONT_CFF
107 /* XXX Remove check when this code moves to .hh file. */
108 return true;
109#endif
110
111 if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
112
113 unsigned int fd = fdSelect->get_fd (glyph);
114 cff2_cs_interpreter_t<cff2_cs_opset_extents_t, cff2_extents_param_t> interp;
115 const byte_str_t str = (*charStrings)[glyph];
116 interp.env.init (str, *this, fd, font->coords, font->num_coords);
117 cff2_extents_param_t param;
118 param.init ();
119 if (unlikely (!interp.interpret (param))) return false;
120
121 if (param.min_x >= param.max_x)
122 {
123 extents->width = 0;
124 extents->x_bearing = 0;
125 }
126 else
127 {
128 extents->x_bearing = font->em_scalef_x (param.min_x.to_real ());
129 extents->width = font->em_scalef_x (param.max_x.to_real () - param.min_x.to_real ());
130 }
131 if (param.min_y >= param.max_y)
132 {
133 extents->height = 0;
134 extents->y_bearing = 0;
135 }
136 else
137 {
138 extents->y_bearing = font->em_scalef_y (param.max_y.to_real ());
139 extents->height = font->em_scalef_y (param.min_y.to_real () - param.max_y.to_real ());
140 }
141
142 return true;
143}
144
145
146#endif
147