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 12
23 // From https://www.unicode.org/Public/emoji/12.0/emoji-data.txt
24 // TODO: Remove once emoji-data.text 12 is in ICU or update to 12.
25 if (c < 0x1F6D5 || c > 0x1FA95) {
26 // Optimization for characters outside the new emoji range.
27 return false;
28 }
29 return c == 0x1F6D5 || c == 0x1F6FA || c == 0x1F93F || c == 0x1F971 || c == 0x1F97B ||
30 (0x1F7E0 <= c && c <= 0x1F7EB) || (0x1F90D <= c && c <= 0x1F90F) ||
31 (0x1F9A5 <= c && c <= 0x1F9AA) || (0x1F9AE <= c && c <= 0x1F9AF) ||
32 (0x1F9BA <= c && c <= 0x1F9BF) || (0x1F9C3 <= c && c <= 0x1F9CA) ||
33 (0x1F9CD <= c && c <= 0x1F9CF) || (0x1FA70 <= c && c <= 0x1FA73) ||
34 (0x1FA78 <= c && c <= 0x1FA7A) || (0x1FA80 <= c && c <= 0x1FA82) ||
35 (0x1FA90 <= c && c <= 0x1FA95);
36 }
37
isEmoji(uint32_t c)38 bool isEmoji(uint32_t c) {
39 return isNewEmoji(c) || u_hasBinaryProperty(c, UCHAR_EMOJI);
40 }
41
isEmojiModifier(uint32_t c)42 bool isEmojiModifier(uint32_t c) {
43 // Emoji modifier are not expected to change, so there's a small change we need to customize
44 // this.
45 return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER);
46 }
47
isEmojiBase(uint32_t c)48 bool isEmojiBase(uint32_t c) {
49 // These two characters were removed from Emoji_Modifier_Base in Emoji 4.0, but we need to keep
50 // them as emoji modifier bases since there are fonts and user-generated text out there that
51 // treats these as potential emoji bases.
52 if (c == 0x1F91D || c == 0x1F93C) {
53 return true;
54 }
55 // Emoji Modifier Base characters new in Unicode emoji 11
56 // From https://www.unicode.org/Public/emoji/11.0/emoji-data.txt
57 // TODO: Remove once emoji-data.text 11 is in ICU or update to 11.
58 if ((0x1F9B5 <= c && c <= 0x1F9B6) || (0x1F9B8 <= c && c <= 0x1F9B9)) {
59 return true;
60 }
61 return u_hasBinaryProperty(c, UCHAR_EMOJI_MODIFIER_BASE);
62 }
63
emojiBidiOverride(const void *,UChar32 c)64 UCharDirection emojiBidiOverride(const void* /* context */, UChar32 c) {
65 if (isNewEmoji(c)) {
66 // All new emoji characters in Unicode 10.0 are of the bidi class ON.
67 return U_OTHER_NEUTRAL;
68 } else {
69 return u_charDirection(c);
70 }
71 }
72
73 } // namespace minikin
74