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chore: darkenColor
util
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/*
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* Copyright (c) 2024 David Allison <davidallisongithub@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 3 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.ichi2.anki.utils.android
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import android.graphics.Color
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import androidx.annotation.ColorInt
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import com.ichi2.anki.common.utils.ext.clamp
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/**
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* Darkens the provided ARGB color by a provided [factor]
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*
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* @param argb The ARGB color to transform
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* @param factor Amount to darken, between 1.0f (no change) and 0.0f (black)
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* @return The darkened color in ARGB
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*/
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@ColorInt
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fun darkenColor(@ColorInt argb: Int, factor: Float): Int {
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val hsv = argb.toHSV()
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// https://en.wikipedia.org/wiki/HSL_and_HSV
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// The third component is the 'value', or 'lightness/darkness'
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hsv[2] = (hsv[2] * factor).clamp(0f, 1f)
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return Color.HSVToColor(hsv)
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}
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/**
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* Converts an ARGB color to an array of its HSV components
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*
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* [0] is Hue: `[0..360[`
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* [1] is Saturation: `[0...1]`
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* [2] is Value: `[0...1]`
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*/
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private fun Int.toHSV(): FloatArray = FloatArray(3).also { arr ->
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Color.colorToHSV(this, arr)
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}
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