Xyz.kt
/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.ui.graphics.colorspace
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.util.packFloats
/**
* Implementation of the CIE XYZ color space. Assumes the white point is D50.
*/
internal class Xyz(
name: String,
id: Int
) : ColorSpace(
name,
ColorModel.Xyz, id
) {
override val isWideGamut: Boolean
get() = true
override fun getMinValue(component: Int): Float {
return -2.0f
}
override fun getMaxValue(component: Int): Float {
return 2.0f
}
override fun toXyz(v: FloatArray): FloatArray {
v[0] = clamp(v[0])
v[1] = clamp(v[1])
v[2] = clamp(v[2])
return v
}
override fun toXy(v0: Float, v1: Float, v2: Float): Long {
return packFloats(clamp(v0), clamp(v1))
}
override fun toZ(v0: Float, v1: Float, v2: Float): Float {
return clamp(v2)
}
override fun xyzaToColor(
x: Float,
y: Float,
z: Float,
a: Float,
colorSpace: ColorSpace
): Color {
return Color(clamp(x), clamp(y), clamp(z), a, colorSpace)
}
override fun fromXyz(v: FloatArray): FloatArray {
v[0] = clamp(v[0])
v[1] = clamp(v[1])
v[2] = clamp(v[2])
return v
}
private fun clamp(x: Float): Float {
return x.coerceIn(-2f, 2f)
}
}