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 // Definitions internal to Minikin
17 
18 #define LOG_TAG "Minikin"
19 
20 #include "MinikinInternal.h"
21 
22 #include <log/log.h>
23 
24 #include "FeatureFlags.h"
25 #include "minikin/MinikinPaint.h"
26 
27 namespace minikin {
28 
isBMPVariationSelector(uint32_t codePoint)29 inline static bool isBMPVariationSelector(uint32_t codePoint) {
30     return VS1 <= codePoint && codePoint <= VS16;
31 }
32 
isVariationSelectorSupplement(uint32_t codePoint)33 inline static bool isVariationSelectorSupplement(uint32_t codePoint) {
34     return VS17 <= codePoint && codePoint <= VS256;
35 }
36 
getVsIndex(uint32_t codePoint)37 uint16_t getVsIndex(uint32_t codePoint) {
38     if (isBMPVariationSelector(codePoint)) {
39         return codePoint - VS1;
40     } else if (isVariationSelectorSupplement(codePoint)) {
41         return codePoint - VS17 + 16;
42     } else {
43         return INVALID_VS_INDEX;
44     }
45 }
46 
isVariationSelector(uint32_t codePoint)47 bool isVariationSelector(uint32_t codePoint) {
48     return isBMPVariationSelector(codePoint) || isVariationSelectorSupplement(codePoint);
49 }
50 
skipCache() const51 bool MinikinPaint::skipCache() const {
52     if (features::letter_spacing_justification()) {
53         return false;  // if the flag is on, do not skip the cache.
54     } else {
55         return !fontFeatureSettings.empty();
56     }
57 }
58 
59 }  // namespace minikin
60