1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <minikin/Emoji.h>
18
19 namespace minikin {
20
isNewEmoji(uint32_t c)21 bool isNewEmoji(uint32_t c) {
22 // Emoji characters new in Unicode emoji 5.0.
23 // From http://www.unicode.org/Public/emoji/5.0/emoji-data.txt
24 // TODO: Remove once emoji-data.text 5.0 is in ICU or update to 6.0.
25 if (c < 0x1F6F7 || c > 0x1F9E6) {
26 // Optimization for characters outside the new emoji range.
27 return false;
28 }
29 return (0x1F6F7 <= c && c <= 0x1F6F8)
30 || c == 0x1F91F
31 || (0x1F928 <= c && c <= 0x1F92F)
32 || (0x1F931 <= c && c <= 0x1F932)
33 || c == 0x1F94C
34 || (0x1F95F <= c && c <= 0x1F96B)
35 || (0x1F992 <= c && c <= 0x1F997)
36 || (0x1F9D0 <= c && c <= 0x1F9E6);
37 }
38
isEmoji(uint32_t c)39 bool isEmoji(uint32_t c) {
40 return isNewEmoji(c) || u_hasBinaryProperty(c, UCHAR_EMOJI);
41 }
42
isEmojiModifier(uint32_t c)43 bool isEmojiModifier(uint32_t c) {
44 // Emoji modifier are not expected to change, so there's a small change we need to customize
45 // this.
46 return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER);
47 }
48
isEmojiBase(uint32_t c)49 bool isEmojiBase(uint32_t c) {
50 // These two characters were removed from Emoji_Modifier_Base in Emoji 4.0, but we need to keep
51 // them as emoji modifier bases since there are fonts and user-generated text out there that
52 // treats these as potential emoji bases.
53 if (c == 0x1F91D || c == 0x1F93C) {
54 return true;
55 }
56 // Emoji Modifier Base characters new in Unicode emoji 5.0.
57 // From http://www.unicode.org/Public/emoji/5.0/emoji-data.txt
58 // TODO: Remove once emoji-data.text 5.0 is in ICU or update to 6.0.
59 if (c == 0x1F91F
60 || (0x1F931 <= c && c <= 0x1F932)
61 || (0x1F9D1 <= c && c <= 0x1F9DD)) {
62 return true;
63 }
64 return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER_BASE);
65 }
66
emojiBidiOverride(const void *,UChar32 c)67 UCharDirection emojiBidiOverride(const void* /* context */, UChar32 c) {
68 if (isNewEmoji(c)) {
69 // All new emoji characters in Unicode 10.0 are of the bidi class ON.
70 return U_OTHER_NEUTRAL;
71 } else {
72 return u_charDirection(c);
73 }
74 }
75
76 } // namespace minikin
77
78