1 /*
2  * Copyright (C) 2023 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 #ifndef HEIF_CLEAN_APERTURE_H_
18 #define HEIF_CLEAN_APERTURE_H_
19 
20 #include <stdint.h>
21 
22 namespace android {
23 namespace heif {
24 
25 struct Fraction {
26     Fraction() = default;
27     Fraction(int32_t n, int32_t d);
28 
29     void simplify();
30     bool commonDenominator(Fraction* f);
31     bool add(Fraction f);
32     bool subtract(Fraction f);
isIntegerFraction33     bool isInteger() const { return n % d == 0; }
getInt32Fraction34     int32_t getInt32() const { return n / d; }
35     int32_t n;
36     int32_t d;
37 };
38 
39 struct CleanAperture {
40     Fraction width;
41     Fraction height;
42     Fraction horizOff;
43     Fraction vertOff;
44 };
45 
46 // Converts the CleanAperture value into a rectangle with bounds left, top, right and bottom.
47 // Returns true on success, false otherwise.
48 bool convertCleanApertureToRect(uint32_t imageW, uint32_t imageH, const CleanAperture& image,
49                                 int32_t* left, int32_t* top, int32_t* right, int32_t* bottom);
50 
51 }  // namespace heif
52 }  // namespace android
53 
54 #endif  // HEIF_CLEAN_APERTURE_H_
55