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
19#ifndef MINIKIN_INTERNAL_H
20#define MINIKIN_INTERNAL_H
21
22#include <hb.h>
23
24#include <utils/Mutex.h>
25
26#include <minikin/MinikinFont.h>
27
28namespace android {
29
30// All external Minikin interfaces are designed to be thread-safe.
31// Presently, that's implemented by through a global lock, and having
32// all external interfaces take that lock.
33
34extern Mutex gMinikinLock;
35
36// Aborts if gMinikinLock is not acquired. Do nothing on the release build.
37void assertMinikinLocked();
38
39// Returns true if c is emoji.
40bool isEmoji(uint32_t c);
41
42// Returns true if c is emoji modifier base.
43bool isEmojiBase(uint32_t c);
44
45// Returns true if c is emoji modifier.
46bool isEmojiModifier(uint32_t c);
47
48hb_blob_t* getFontTable(MinikinFont* minikinFont, uint32_t tag);
49
50// An RAII wrapper for hb_blob_t
51class HbBlob {
52public:
53    // Takes ownership of hb_blob_t object, caller is no longer
54    // responsible for calling hb_blob_destroy().
55    HbBlob(hb_blob_t* blob) : mBlob(blob) {
56    }
57
58    ~HbBlob() {
59        hb_blob_destroy(mBlob);
60    }
61
62    const uint8_t* get() const {
63        const char* data = hb_blob_get_data(mBlob, nullptr);
64        return reinterpret_cast<const uint8_t*>(data);
65    }
66
67    size_t size() const {
68        unsigned int length = 0;
69        hb_blob_get_data(mBlob, &length);
70        return (size_t)length;
71    }
72
73private:
74    hb_blob_t* mBlob;
75};
76
77}
78
79#endif  // MINIKIN_INTERNAL_H
80