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Commit 19fdbc55 authored by Shan Huang's avatar Shan Huang
Browse files

Draw ripple effect in a circle to reduce overdraw 

Bug: 183382912
Test: Visual inspection. See attached video.
Change-Id: Ie60e4903a418bc23aa0e9281fe2f442ac77528e8
parent d87df180

packages/SystemUI/src/com/android/systemui/statusbar/charging/ChargingRippleView.kt

+14 −3
Original line number Diff line number Diff line
@@ -39,9 +39,15 @@ class ChargingRippleView(context: Context?, attrs: AttributeSet?) : View(context 


    var rippleInProgress: Boolean = false

    var radius: Float = 0.0f

        set(value) { rippleShader.radius = value }

        set(value) {

            rippleShader.radius = value

            field = value

        }

    var origin: PointF = PointF()

        set(value) { rippleShader.origin = value }

        set(value) {

            rippleShader.origin = value

            field = value

        }

    var duration: Long = 1750



    init {
@@ -94,6 +100,11 @@ class ChargingRippleView(context: Context?, attrs: AttributeSet?) : View(context 
    }



    override fun onDraw(canvas: Canvas?) {

        canvas?.drawRect(0f, 0f, width.toFloat(), height.toFloat(), ripplePaint)

        // To reduce overdraw, we mask the effect to a circle whose radius is big enough to cover

        // the active effect area. Values here should be kept in sync with the

        // animation implementation in the ripple shader.

        val maskRadius = (1 - (1 - rippleShader.progress) * (1 - rippleShader.progress) *

                (1 - rippleShader.progress)) * radius * 1.5f

        canvas?.drawCircle(origin.x, origin.y, maskRadius, ripplePaint)

    }

}