1 /*
2  * Copyright (C) 2019 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 package com.android.keyguard.clock
18 
19 import android.graphics.Color
20 import android.util.MathUtils
21 
22 private const val PRIMARY_INDEX = 5
23 private const val SECONDARY_DARK_INDEX = 8
24 private const val SECONDARY_LIGHT_INDEX = 2
25 
26 /**
27  * A helper class to extract colors from a clock face.
28  */
29 class ClockPalette {
30 
31     private var darkAmount: Float = 0f
32     private var accentPrimary: Int = Color.WHITE
33     private var accentSecondaryLight: Int = Color.WHITE
34     private var accentSecondaryDark: Int = Color.BLACK
35     private val lightHSV: FloatArray = FloatArray(3)
36     private val darkHSV: FloatArray = FloatArray(3)
37     private val hsv: FloatArray = FloatArray(3)
38 
39     /** Returns a color from the palette as an RGB packed int. */
40     fun getPrimaryColor(): Int {
41         return accentPrimary
42     }
43 
44     /** Returns either a light or dark color from the palette as an RGB packed int. */
45     fun getSecondaryColor(): Int {
46         Color.colorToHSV(accentSecondaryLight, lightHSV)
47         Color.colorToHSV(accentSecondaryDark, darkHSV)
48         for (i in 0..2) {
49             hsv[i] = MathUtils.lerp(darkHSV[i], lightHSV[i], darkAmount)
50         }
51         return Color.HSVToColor(hsv)
52     }
53 
54     /** See {@link ClockPlugin#setColorPalette}. */
55     fun setColorPalette(supportsDarkText: Boolean, colorPalette: IntArray?) {
56         if (colorPalette == null || colorPalette.isEmpty()) {
57             accentPrimary = Color.WHITE
58             accentSecondaryLight = Color.WHITE
59             accentSecondaryDark = if (supportsDarkText) Color.BLACK else Color.WHITE
60             return
61         }
62         val length = colorPalette.size
63         accentPrimary = colorPalette[Math.max(0, length - PRIMARY_INDEX)]
64         accentSecondaryLight = colorPalette[Math.max(0, length - SECONDARY_LIGHT_INDEX)]
65         accentSecondaryDark = colorPalette[Math.max(0,
66                 length - if (supportsDarkText) SECONDARY_DARK_INDEX else SECONDARY_LIGHT_INDEX)]
67     }
68 
69     /** See {@link ClockPlugin#setDarkAmount}. */
70     fun setDarkAmount(darkAmount: Float) {
71         this.darkAmount = darkAmount
72     }
73 }
74