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 
28 namespace 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 
34 extern Mutex gMinikinLock;
35 
36 // Aborts if gMinikinLock is not acquired. Do nothing on the release build.
37 void assertMinikinLocked();
38 
39 // Returns true if c is emoji.
40 bool isEmoji(uint32_t c);
41 
42 // Returns true if c is emoji modifier base.
43 bool isEmojiBase(uint32_t c);
44 
45 // Returns true if c is emoji modifier.
46 bool isEmojiModifier(uint32_t c);
47 
48 hb_blob_t* getFontTable(MinikinFont* minikinFont, uint32_t tag);
49 
50 // An RAII wrapper for hb_blob_t
51 class HbBlob {
52 public:
53     // Takes ownership of hb_blob_t object, caller is no longer
54     // responsible for calling hb_blob_destroy().
HbBlob(hb_blob_t * blob)55     HbBlob(hb_blob_t* blob) : mBlob(blob) {
56     }
57 
~HbBlob()58     ~HbBlob() {
59         hb_blob_destroy(mBlob);
60     }
61 
get()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 
size()67     size_t size() const {
68         unsigned int length = 0;
69         hb_blob_get_data(mBlob, &length);
70         return (size_t)length;
71     }
72 
73 private:
74     hb_blob_t* mBlob;
75 };
76 
77 }
78 
79 #endif  // MINIKIN_INTERNAL_H
80