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// Definitions internal to Minikin
18#define LOG_TAG "Minikin"
19
20#include "MinikinInternal.h"
21#include "HbFontCache.h"
22
23#include <log/log.h>
24
25namespace minikin {
26
27android::Mutex gMinikinLock;
28
29void assertMinikinLocked() {
30#ifdef ENABLE_RACE_DETECTION
31    LOG_ALWAYS_FATAL_IF(gMinikinLock.tryLock() == 0);
32#endif
33}
34
35hb_blob_t* getFontTable(const MinikinFont* minikinFont, uint32_t tag) {
36    assertMinikinLocked();
37    hb_font_t* font = getHbFontLocked(minikinFont);
38    hb_face_t* face = hb_font_get_face(font);
39    hb_blob_t* blob = hb_face_reference_table(face, tag);
40    hb_font_destroy(font);
41    return blob;
42}
43
44inline static bool isBMPVariationSelector(uint32_t codePoint) {
45    return VS1 <= codePoint && codePoint <= VS16;
46}
47
48inline static bool isVariationSelectorSupplement(uint32_t codePoint) {
49    return VS17 <= codePoint && codePoint <= VS256;
50}
51
52uint16_t getVsIndex(uint32_t codePoint) {
53    if (isBMPVariationSelector(codePoint)) {
54        return codePoint - VS1;
55    } else if (isVariationSelectorSupplement(codePoint)) {
56        return codePoint - VS17 + 16;
57    } else {
58        return INVALID_VS_INDEX;
59    }
60}
61
62bool isVariationSelector(uint32_t codePoint) {
63    return isBMPVariationSelector(codePoint) || isVariationSelectorSupplement(codePoint);
64}
65
66}  // namespace minikin
67