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#include "hb-draw.hh"
34
35using namespace CFF;
36
37struct cff2_extents_param_t
38{
39 cff2_extents_param_t ()
40 {
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 = false;
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<number_t>, cff2_extents_param_t>
67{
68 static void moveto (cff2_cs_interp_env_t<number_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<number_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<number_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, number_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 const hb_ubytes_t str = (*charStrings)[glyph];
115 cff2_cs_interp_env_t<number_t> env (str, *this, fd, font->coords, font->num_coords);
116 cff2_cs_interpreter_t<cff2_cs_opset_extents_t, cff2_extents_param_t, number_t> interp (env);
117 cff2_extents_param_t param;
118 if (unlikely (!interp.interpret (param))) return false;
119
120 if (param.min_x >= param.max_x)
121 {
122 extents->width = 0;
123 extents->x_bearing = 0;
124 }
125 else
126 {
127 extents->x_bearing = roundf (param.min_x.to_real ());
128 extents->width = roundf (param.max_x.to_real () - extents->x_bearing);
129 }
130 if (param.min_y >= param.max_y)
131 {
132 extents->height = 0;
133 extents->y_bearing = 0;
134 }
135 else
136 {
137 extents->y_bearing = roundf (param.max_y.to_real ());
138 extents->height = roundf (param.min_y.to_real () - extents->y_bearing);
139 }
140
141 font->scale_glyph_extents (extents);
142
143 return true;
144}
145
146bool OT::cff2::accelerator_t::paint_glyph (hb_font_t *font, hb_codepoint_t glyph, hb_paint_funcs_t *funcs, void *data, hb_color_t foreground) const
147{
148 funcs->push_clip_glyph (data, glyph, font);
149 funcs->color (data, true, foreground);
150 funcs->pop_clip (data);
151
152 return true;
153}
154
155struct cff2_path_param_t
156{
157 cff2_path_param_t (hb_font_t *font_, hb_draw_session_t &draw_session_)
158 {
159 draw_session = &draw_session_;
160 font = font_;
161 }
162
163 void move_to (const point_t &p)
164 { draw_session->move_to (font->em_fscalef_x (p.x.to_real ()), font->em_fscalef_y (p.y.to_real ())); }
165
166 void line_to (const point_t &p)
167 { draw_session->line_to (font->em_fscalef_x (p.x.to_real ()), font->em_fscalef_y (p.y.to_real ())); }
168
169 void cubic_to (const point_t &p1, const point_t &p2, const point_t &p3)
170 {
171 draw_session->cubic_to (font->em_fscalef_x (p1.x.to_real ()), font->em_fscalef_y (p1.y.to_real ()),
172 font->em_fscalef_x (p2.x.to_real ()), font->em_fscalef_y (p2.y.to_real ()),
173 font->em_fscalef_x (p3.x.to_real ()), font->em_fscalef_y (p3.y.to_real ()));
174 }
175
176 protected:
177 hb_draw_session_t *draw_session;
178 hb_font_t *font;
179};
180
181struct cff2_path_procs_path_t : path_procs_t<cff2_path_procs_path_t, cff2_cs_interp_env_t<number_t>, cff2_path_param_t>
182{
183 static void moveto (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt)
184 {
185 param.move_to (pt);
186 env.moveto (pt);
187 }
188
189 static void line (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt1)
190 {
191 param.line_to (pt1);
192 env.moveto (pt1);
193 }
194
195 static void curve (cff2_cs_interp_env_t<number_t> &env, cff2_path_param_t& param, const point_t &pt1, const point_t &pt2, const point_t &pt3)
196 {
197 param.cubic_to (pt1, pt2, pt3);
198 env.moveto (pt3);
199 }
200};
201
202struct cff2_cs_opset_path_t : cff2_cs_opset_t<cff2_cs_opset_path_t, cff2_path_param_t, number_t, cff2_path_procs_path_t> {};
203
204bool OT::cff2::accelerator_t::get_path (hb_font_t *font, hb_codepoint_t glyph, hb_draw_session_t &draw_session) const
205{
206#ifdef HB_NO_OT_FONT_CFF
207 /* XXX Remove check when this code moves to .hh file. */
208 return true;
209#endif
210
211 if (unlikely (!is_valid () || (glyph >= num_glyphs))) return false;
212
213 unsigned int fd = fdSelect->get_fd (glyph);
214 const hb_ubytes_t str = (*charStrings)[glyph];
215 cff2_cs_interp_env_t<number_t> env (str, *this, fd, font->coords, font->num_coords);
216 cff2_cs_interpreter_t<cff2_cs_opset_path_t, cff2_path_param_t, number_t> interp (env);
217 cff2_path_param_t param (font, draw_session);
218 if (unlikely (!interp.interpret (param))) return false;
219 return true;
220}
221
222#endif
223