MaskedDrawable.kt
/*
* Copyright 2021 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.core.splashscreen
import android.graphics.Canvas
import android.graphics.ColorFilter
import android.graphics.Path
import android.graphics.Rect
import android.graphics.drawable.Drawable
/**
* A wrapper around a `drawable` that clip it to fit in a circle of diameter `maskDiameter`.
* @param drawable The drawable to clip
* @param maskDiameter The diameter of the mask used to clip the drawable.
*/
internal class MaskedDrawable(
private val drawable: Drawable,
private val maskDiameter: Float
) : Drawable() {
private val mask = Path().apply {
val radius = maskDiameter / 2f
addCircle(0f, 0f, radius, Path.Direction.CW)
}
override fun draw(canvas: Canvas) {
canvas.clipPath(mask)
drawable.draw(canvas)
}
override fun setAlpha(alpha: Int) {
drawable.alpha = alpha
}
override fun setColorFilter(colorFilter: ColorFilter?) {
drawable.colorFilter = colorFilter
}
@Suppress("DEPRECATION")
override fun getOpacity() = drawable.opacity
override fun onBoundsChange(bounds: Rect) {
super.onBoundsChange(bounds)
drawable.bounds = bounds
mask.offset(bounds.exactCenterX(), bounds.exactCenterY())
}
}