Merge "Add check for whether entire ellipse touch is within sensor"

import com.android.systemui.biometrics.EllipseOverlapDetectorParams

import com.android.systemui.dagger.SysUISingleton

import kotlin.math.cos

import kotlin.math.pow

import kotlin.math.sin

import kotlin.math.sqrt

private enum class SensorPixelPosition {

    OUTSIDE, // Pixel that falls outside of sensor circle

@SysUISingleton

class EllipseOverlapDetector(private val params: EllipseOverlapDetectorParams) : OverlapDetector {

    override fun isGoodOverlap(touchData: NormalizedTouchData, nativeSensorBounds: Rect): Boolean {

        // First, check if entire ellipse is within the sensor

        if (isEllipseWithinSensor(touchData, nativeSensorBounds)) {

            return true

        }

        var isTargetTouched = false

        var sensorPixels = 0

        var coveredPixels = 0

        return result <= 1

    }

    /** Returns whether the entire ellipse is contained within the sensor area */

    private fun isEllipseWithinSensor(

        touchData: NormalizedTouchData,

        nativeSensorBounds: Rect

    ): Boolean {

        val a2 = (touchData.minor / 2.0).pow(2.0)

        val b2 = (touchData.major / 2.0).pow(2.0)

        val sin2a = sin(touchData.orientation.toDouble()).pow(2.0)

        val cos2a = cos(touchData.orientation.toDouble()).pow(2.0)

        val cx = sqrt(a2 * cos2a + b2 * sin2a)

        val cy = sqrt(a2 * sin2a + b2 * cos2a)

        val ellipseRect =

            Rect(

                (-cx + touchData.x).toInt(),

                (-cy + touchData.y).toInt(),

                (cx + touchData.x).toInt(),

                (cy + touchData.y).toInt()

            )

        return nativeSensorBounds.contains(ellipseRect)

    }

}