1 /*
2 * Copyright © 2023 Behdad Esfahbod
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
25 #ifndef HB_WASM_API_FONT_HH
26 #define HB_WASM_API_FONT_HH
27
28 #include "hb-wasm-api.hh"
29
30 #include "hb-outline.hh"
31
32 namespace hb {
33 namespace wasm {
34
35
HB_WASM_API(ptr_t (font_t),font_create)36 HB_WASM_API (ptr_t(font_t), font_create) (HB_WASM_EXEC_ENV
37 ptr_d(face_t, face))
38 {
39 HB_REF2OBJ (face);
40
41 hb_font_t *font = hb_font_create (face);
42
43 HB_OBJ2REF (font);
44 return fontref;
45 }
46
HB_WASM_API(ptr_t (face_t),font_get_face)47 HB_WASM_API (ptr_t(face_t), font_get_face) (HB_WASM_EXEC_ENV
48 ptr_d(font_t, font))
49 {
50 HB_REF2OBJ (font);
51
52 hb_face_t *face = hb_font_get_face (font);
53
54 HB_OBJ2REF (face);
55 return faceref;
56 }
57
HB_WASM_API(void,font_get_scale)58 HB_WASM_API (void, font_get_scale) (HB_WASM_EXEC_ENV
59 ptr_d(font_t, font),
60 ptr_d(int32_t, x_scale),
61 ptr_d(int32_t, y_scale))
62 {
63 HB_REF2OBJ (font);
64
65 HB_PTR_PARAM(int32_t, x_scale);
66 HB_PTR_PARAM(int32_t, y_scale);
67
68 hb_font_get_scale (font, x_scale, y_scale);
69 }
70
HB_WASM_API(codepoint_t,font_get_glyph)71 HB_WASM_API (codepoint_t, font_get_glyph) (HB_WASM_EXEC_ENV
72 ptr_d(font_t, font),
73 codepoint_t unicode,
74 codepoint_t variation_selector)
75 {
76 HB_REF2OBJ (font);
77 codepoint_t glyph;
78
79 hb_font_get_glyph (font, unicode, variation_selector, &glyph);
80 return glyph;
81 }
82
HB_WASM_API(position_t,font_get_glyph_h_advance)83 HB_WASM_API (position_t, font_get_glyph_h_advance) (HB_WASM_EXEC_ENV
84 ptr_d(font_t, font),
85 codepoint_t glyph)
86 {
87 HB_REF2OBJ (font);
88 return hb_font_get_glyph_h_advance (font, glyph);
89 }
90
HB_WASM_API(position_t,font_get_glyph_v_advance)91 HB_WASM_API (position_t, font_get_glyph_v_advance) (HB_WASM_EXEC_ENV
92 ptr_d(font_t, font),
93 codepoint_t glyph)
94 {
95 HB_REF2OBJ (font);
96 return hb_font_get_glyph_v_advance (font, glyph);
97 }
98
99 static_assert (sizeof (glyph_extents_t) == sizeof (hb_glyph_extents_t), "");
100
HB_WASM_API(bool_t,font_get_glyph_extents)101 HB_WASM_API (bool_t, font_get_glyph_extents) (HB_WASM_EXEC_ENV
102 ptr_d(font_t, font),
103 codepoint_t glyph,
104 ptr_d(glyph_extents_t, extents))
105 {
106 HB_REF2OBJ (font);
107 HB_PTR_PARAM (glyph_extents_t, extents);
108 if (unlikely (!extents))
109 return false;
110
111 return hb_font_get_glyph_extents (font, glyph,
112 (hb_glyph_extents_t *) extents);
113 }
114
HB_WASM_API(void,font_glyph_to_string)115 HB_WASM_API (void, font_glyph_to_string) (HB_WASM_EXEC_ENV
116 ptr_d(font_t, font),
117 codepoint_t glyph,
118 char *s, uint32_t size)
119 {
120 HB_REF2OBJ (font);
121
122 hb_font_glyph_to_string (font, glyph, s, size);
123 }
124
125 static_assert (sizeof (glyph_outline_point_t) == sizeof (hb_outline_point_t), "");
126 static_assert (sizeof (uint32_t) == sizeof (hb_outline_t::contours[0]), "");
127
HB_WASM_API(bool_t,font_copy_glyph_outline)128 HB_WASM_API (bool_t, font_copy_glyph_outline) (HB_WASM_EXEC_ENV
129 ptr_d(font_t, font),
130 codepoint_t glyph,
131 ptr_d(glyph_outline_t, outline))
132 {
133 HB_REF2OBJ (font);
134 HB_PTR_PARAM (glyph_outline_t, outline);
135 if (unlikely (!outline))
136 return false;
137
138 hb_outline_t hb_outline;
139 auto *funcs = hb_outline_recording_pen_get_funcs ();
140
141 hb_font_draw_glyph (font, glyph, funcs, &hb_outline);
142
143 if (unlikely (hb_outline.points.in_error () ||
144 hb_outline.contours.in_error ()))
145 {
146 outline->n_points = outline->n_contours = 0;
147 return false;
148 }
149
150 // TODO Check two buffers separately
151 if (hb_outline.points.length <= outline->n_points &&
152 hb_outline.contours.length <= outline->n_contours)
153 {
154 glyph_outline_point_t *points = HB_ARRAY_APP2NATIVE (glyph_outline_point_t, outline->points, hb_outline.points.length);
155 uint32_t *contours = HB_ARRAY_APP2NATIVE (uint32_t, outline->contours, hb_outline.contours.length);
156
157 if (unlikely (!points || !contours))
158 {
159 outline->n_points = outline->n_contours = 0;
160 return false;
161 }
162
163 hb_memcpy (points, hb_outline.points.arrayZ, hb_outline.points.get_size ());
164 hb_memcpy (contours, hb_outline.contours.arrayZ, hb_outline.contours.get_size ());
165
166 return true;
167 }
168
169 outline->n_points = hb_outline.points.length;
170 outline->points = wasm_runtime_module_dup_data (module_inst,
171 (const char *) hb_outline.points.arrayZ,
172 hb_outline.points.get_size ());
173 outline->n_contours = hb_outline.contours.length;
174 outline->contours = wasm_runtime_module_dup_data (module_inst,
175 (const char *) hb_outline.contours.arrayZ,
176 hb_outline.contours.get_size ());
177
178 if ((outline->n_points && !outline->points) ||
179 (!outline->n_contours && !outline->contours))
180 {
181 outline->n_points = outline->n_contours = 0;
182 return false;
183 }
184
185 return true;
186 }
187
HB_WASM_API(void,glyph_outline_free)188 HB_WASM_API (void, glyph_outline_free) (HB_WASM_EXEC_ENV
189 ptr_d(glyph_outline_t, outline))
190 {
191 HB_PTR_PARAM (glyph_outline_t, outline);
192 if (unlikely (!outline))
193 return;
194
195 module_free (outline->points);
196 module_free (outline->contours);
197
198 outline->n_points = 0;
199 outline->points = nullref;
200 outline->n_contours = 0;
201 outline->contours = nullref;
202 }
203
HB_WASM_API(bool_t,font_copy_coords)204 HB_WASM_API (bool_t, font_copy_coords) (HB_WASM_EXEC_ENV
205 ptr_d(font_t, font),
206 ptr_d(coords_t, coords))
207 {
208 HB_REF2OBJ (font);
209 HB_PTR_PARAM (coords_t, coords);
210 if (unlikely (!coords))
211 return false;
212
213 unsigned our_length;
214 const int* our_coords = hb_font_get_var_coords_normalized(font, &our_length);
215
216 if (our_length <= coords->length) {
217 int *their_coords = HB_ARRAY_APP2NATIVE (int, coords->coords, our_length);
218 if (unlikely(!their_coords)) {
219 coords->length = 0;
220 return false;
221 }
222 unsigned bytes = our_length * sizeof (int);
223 hb_memcpy (their_coords, our_coords, bytes);
224
225 return true;
226 }
227
228 module_free (coords->coords);
229 coords->length = our_length;
230 unsigned bytes = our_length * sizeof (int);
231 coords->coords = wasm_runtime_module_dup_data (module_inst, (const char *) our_coords, bytes);
232 if (our_length && !coords->coords)
233 {
234 coords->length = 0;
235 return false;
236 }
237
238 return true;
239 }
240
HB_WASM_API(bool_t,font_set_coords)241 HB_WASM_API (bool_t, font_set_coords) (HB_WASM_EXEC_ENV
242 ptr_d(font_t, font),
243 ptr_d(coords_t, coords))
244 {
245 HB_REF2OBJ (font);
246 HB_PTR_PARAM (coords_t, coords);
247 if (unlikely (!coords))
248 return false;
249
250 unsigned length = coords->length;
251 unsigned bytes;
252 if (unlikely (hb_unsigned_mul_overflows (length, sizeof (int), &bytes)))
253 return false;
254
255 const int *our_coords = (const int *) (validate_app_addr (coords->coords, bytes) ? addr_app_to_native (coords->coords) : nullptr);
256 hb_font_set_var_coords_normalized(font, our_coords, length);
257 return true;
258 }
259
260
261 }}
262
263 #endif /* HB_WASM_API_FONT_HH */
264