1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/**
* Modified version of hb-subset bindings from "subset-font" package https://github.com/papandreou/subset-font/blob/3f711c8aa29a426c7f22655861abfb976950f527/index.js
*
* CHANGELOG:
* - removed dependency on node APIs to work inside the browser
* - removed dependency on font fontverter for brotli compression
* - removed dependencies on lodash and p-limit
* - removed options for preserveNameIds, variationAxes, noLayoutClosure (not needed for now)
* - replaced text input with codepoints
* - rewritten in typescript and with esm modules
Copyright (c) 2012, Andreas Lind Petersen
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of the author nor the names of contributors may
be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// function HB_TAG(str) {
// return str.split("").reduce((a, ch) => {
// return (a << 8) + ch.charCodeAt(0);
// }, 0);
// }
function subset(
hbSubsetWasm: any,
heapu8: Uint8Array,
font: ArrayBuffer,
codePoints: ReadonlySet<number>,
) {
const input = hbSubsetWasm.hb_subset_input_create_or_fail();
if (input === 0) {
throw new Error(
"hb_subset_input_create_or_fail (harfbuzz) returned zero, indicating failure",
);
}
const fontBuffer = hbSubsetWasm.malloc(font.byteLength);
heapu8.set(new Uint8Array(font), fontBuffer);
// Create the face
const blob = hbSubsetWasm.hb_blob_create(
fontBuffer,
font.byteLength,
2, // HB_MEMORY_MODE_WRITABLE
0,
0,
);
const face = hbSubsetWasm.hb_face_create(blob, 0);
hbSubsetWasm.hb_blob_destroy(blob);
// Do the equivalent of --font-features=*
const layoutFeatures = hbSubsetWasm.hb_subset_input_set(
input,
6, // HB_SUBSET_SETS_LAYOUT_FEATURE_TAG
);
hbSubsetWasm.hb_set_clear(layoutFeatures);
hbSubsetWasm.hb_set_invert(layoutFeatures);
// if (preserveNameIds) {
// const inputNameIds = harfbuzzJsWasm.hb_subset_input_set(
// input,
// 4, // HB_SUBSET_SETS_NAME_ID
// );
// for (const nameId of preserveNameIds) {
// harfbuzzJsWasm.hb_set_add(inputNameIds, nameId);
// }
// }
// if (noLayoutClosure) {
// harfbuzzJsWasm.hb_subset_input_set_flags(
// input,
// harfbuzzJsWasm.hb_subset_input_get_flags(input) | 0x00000200, // HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE
// );
// }
// Add unicodes indices
const inputUnicodes = hbSubsetWasm.hb_subset_input_unicode_set(input);
for (const c of codePoints) {
hbSubsetWasm.hb_set_add(inputUnicodes, c);
}
// if (variationAxes) {
// for (const [axisName, value] of Object.entries(variationAxes)) {
// if (typeof value === "number") {
// // Simple case: Pin/instance the variation axis to a single value
// if (
// !harfbuzzJsWasm.hb_subset_input_pin_axis_location(
// input,
// face,
// HB_TAG(axisName),
// value,
// )
// ) {
// harfbuzzJsWasm.hb_face_destroy(face);
// harfbuzzJsWasm.free(fontBuffer);
// throw new Error(
// `hb_subset_input_pin_axis_location (harfbuzz) returned zero when pinning ${axisName} to ${value}, indicating failure. Maybe the axis does not exist in the font?`,
// );
// }
// } else if (value && typeof value === "object") {
// // Complex case: Reduce the variation space of the axis
// if (
// typeof value.min === "undefined" ||
// typeof value.max === "undefined"
// ) {
// harfbuzzJsWasm.hb_face_destroy(face);
// harfbuzzJsWasm.free(fontBuffer);
// throw new Error(
// `${axisName}: You must provide both a min and a max value when setting the axis range`,
// );
// }
// if (
// !harfbuzzJsWasm.hb_subset_input_set_axis_range(
// input,
// face,
// HB_TAG(axisName),
// value.min,
// value.max,
// // An explicit NaN makes harfbuzz use the existing default value, clamping to the new range if necessary
// value.default ?? NaN,
// )
// ) {
// harfbuzzJsWasm.hb_face_destroy(face);
// harfbuzzJsWasm.free(fontBuffer);
// throw new Error(
// `hb_subset_input_set_axis_range (harfbuzz) returned zero when setting the range of ${axisName} to [${value.min}; ${value.max}] and a default value of ${value.default}, indicating failure. Maybe the axis does not exist in the font?`,
// );
// }
// }
// }
// }
let subset;
try {
subset = hbSubsetWasm.hb_subset_or_fail(face, input);
if (subset === 0) {
hbSubsetWasm.hb_face_destroy(face);
hbSubsetWasm.free(fontBuffer);
throw new Error(
"hb_subset_or_fail (harfbuzz) returned zero, indicating failure. Maybe the input file is corrupted?",
);
}
} finally {
// Clean up
hbSubsetWasm.hb_subset_input_destroy(input);
}
// Get result blob
const result = hbSubsetWasm.hb_face_reference_blob(subset);
const offset = hbSubsetWasm.hb_blob_get_data(result, 0);
const subsetByteLength = hbSubsetWasm.hb_blob_get_length(result);
if (subsetByteLength === 0) {
hbSubsetWasm.hb_blob_destroy(result);
hbSubsetWasm.hb_face_destroy(subset);
hbSubsetWasm.hb_face_destroy(face);
hbSubsetWasm.free(fontBuffer);
throw new Error(
"Failed to create subset font, maybe the input file is corrupted?",
);
}
const subsetFont = new Uint8Array(
heapu8.subarray(offset, offset + subsetByteLength),
);
// Clean up
hbSubsetWasm.hb_blob_destroy(result);
hbSubsetWasm.hb_face_destroy(subset);
hbSubsetWasm.hb_face_destroy(face);
hbSubsetWasm.free(fontBuffer);
return subsetFont;
}
export default {
subset,
};
|
