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#include <utils/Log.h>
24#include <utils/Mutex.h>
25
26#include "minikin/HbUtils.h"
27#include "minikin/MinikinFont.h"
28
29namespace minikin {
30
31#ifdef ENABLE_ASSERTION
32#define MINIKIN_ASSERT(cond, ...) LOG_ALWAYS_FATAL_IF(!(cond), __VA_ARGS__)
33#else
34#define MINIKIN_ASSERT(cond, ...) ((void)0)
35#endif
36
37#define MINIKIN_NOT_REACHED(...) MINIKIN_ASSERT(false, __VA_ARGS__);
38
39constexpr uint32_t MAX_UNICODE_CODE_POINT = 0x10FFFF;
40
41constexpr uint32_t VS1 = 0xFE00;
42constexpr uint32_t VS16 = 0xFE0F;
43constexpr uint32_t VS17 = 0xE0100;
44constexpr uint32_t VS256 = 0xE01EF;
45
46// Returns variation selector index. This is one unit less than the variation selector number. For
47// example, VARIATION SELECTOR-25 maps to 24.
48// [0x00-0x0F] for U+FE00..U+FE0F
49// [0x10-0xFF] for U+E0100..U+E01EF
50// INVALID_VS_INDEX for other input.
51constexpr uint16_t INVALID_VS_INDEX = 0xFFFF;
52uint16_t getVsIndex(uint32_t codePoint);
53
54// Returns true if the code point is a variation selector.
55// Note that this function returns false for Mongolian free variation selectors.
56bool isVariationSelector(uint32_t codePoint);
57
58// An RAII accessor for hb_blob_t
59class HbBlob {
60public:
61    HbBlob(const HbFaceUniquePtr& face, uint32_t tag)
62            : mBlob(hb_face_reference_table(face.get(), tag)) {}
63    HbBlob(const HbFontUniquePtr& font, uint32_t tag)
64            : mBlob(hb_face_reference_table(hb_font_get_face(font.get()), tag)) {}
65
66    inline const uint8_t* get() const {
67        return reinterpret_cast<const uint8_t*>(hb_blob_get_data(mBlob.get(), nullptr));
68    }
69
70    inline size_t size() const { return (size_t)hb_blob_get_length(mBlob.get()); }
71
72    inline operator bool() const { return size() > 0; }
73
74private:
75    HbBlobUniquePtr mBlob;
76};
77
78}  // namespace minikin
79
80#endif  // MINIKIN_INTERNAL_H
81