MathUtils.h revision deeda3d337aed1eee218b89a7aba5992ced371f0 
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#ifndef MATHUTILS_H
17#define MATHUTILS_H
18
19namespace android {
20namespace uirenderer {
21
22class MathUtils {
23private:
24    static const float gNonZeroEpsilon = 0.001f;
25public:
26    /**
27     * Check for floats that are close enough to zero.
28     */
29    inline static bool isZero(float value) {
30        return (value >= -gNonZeroEpsilon) && (value <= gNonZeroEpsilon);
31    }
32
33    inline static bool isPositive(float value) {
34        return value >= gNonZeroEpsilon;
35    }
36
37    inline static bool areEqual(float valueA, float valueB) {
38        return isZero(valueA - valueB);
39    }
40
41    inline static int min(int a, int b) {
42        return a < b ? a : b;
43    }
44
45    inline static float lerp(float v1, float v2, float t) {
46        return v1 + ((v2 - v1) * t);
47    }
48}; // class MathUtils
49
50} /* namespace uirenderer */
51} /* namespace android */
52
53#endif /* MATHUTILS_H */
54