FloatColor.h revision 8762e332e3797fb41929a1c6069207f4906ca329 
1/*
2 * Copyright (C) 2015 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 FLOATCOLOR_H
17#define FLOATCOLOR_H
18
19#include "utils/Color.h"
20#include "utils/Macros.h"
21#include "utils/MathUtils.h"
22
23#include <stdint.h>
24
25namespace android {
26namespace uirenderer {
27
28struct FloatColor {
29    // "color" is a gamma-encoded sRGB color
30    // After calling this method, the color is stored as a pre-multiplied linear color
31    // if linear blending is enabled. Otherwise, the color is stored as a pre-multiplied
32    // gamma-encoded sRGB color
33    void set(uint32_t color) {
34        a = ((color >> 24) & 0xff) / 255.0f;
35        r = a * EOCF(((color >> 16) & 0xff) / 255.0f);
36        g = a * EOCF(((color >>  8) & 0xff) / 255.0f);
37        b = a * EOCF(((color      ) & 0xff) / 255.0f);
38    }
39
40    // "color" is a gamma-encoded sRGB color
41    // After calling this method, the color is stored as a pre-multiplied linear color
42    // if linear blending is enabled.
43    void setSRGB(uint32_t color) {
44        a = ((color >> 24) & 0xff) / 255.0f;
45        r = a * EOCF_sRGB(((color >> 16) & 0xff) / 255.0f);
46        g = a * EOCF_sRGB(((color >>  8) & 0xff) / 255.0f);
47        b = a * EOCF_sRGB(((color      ) & 0xff) / 255.0f);
48    }
49
50    bool isNotBlack() {
51        return a < 1.0f
52                || r > 0.0f
53                || g > 0.0f
54                || b > 0.0f;
55    }
56
57    bool operator==(const FloatColor& other) const {
58        return MathUtils::areEqual(r, other.r)
59                && MathUtils::areEqual(g, other.g)
60                && MathUtils::areEqual(b, other.b)
61                && MathUtils::areEqual(a, other.a);
62    }
63
64    bool operator!=(const FloatColor& other) const {
65        return !(*this == other);
66    }
67
68    float r;
69    float g;
70    float b;
71    float a;
72};
73
74REQUIRE_COMPATIBLE_LAYOUT(FloatColor);
75
76} /* namespace uirenderer */
77} /* namespace android */
78
79#endif /* FLOATCOLOR_H */
80