Revert "UdfpsHelper: Avoid hardcoding 4095 for maximum panel brightness"

    <!-- Whether to enable framework dimming for UDFPS -->

    <bool name="config_udfpsFrameworkDimming">false</bool>

    <!-- Brightness-to-alpha lookup table (LUT) for UDFPS framework dimming.

         Each entry is in the format <brightness>,<alpha> where:

           - brightness = panel backlight level

           - alpha = dim layer transparency applied at that brightness

         Rules:

           • The entries should be strictly ascending by brightness.

           • First entry = <minBrightness,maxAlpha>.

           • Last entry  = <maxBrightness,minAlpha>.

    -->

    <!-- Array of brightness-alpha LUT for framework dimming -->

    <string-array name="config_udfpsDimmingBrightnessAlphaArray" translatable="false">

          <item>0,255</item>

          <item>1,248</item>

          <item>2,242</item>

          <item>3,238</item>

          <item>4,236</item>

          <item>6,236</item>

            val (brightness, alpha) = it.split(",").map { value -> value.trim().toInt() }

            brightness to alpha

        }

    val maxPanelBrightness: Int = brightnessAlphaMap.keys.max()

    private val dimLayoutParams = WindowManager.LayoutParams(

        WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,

    // brightness_alpha_lut array from the kernel. This provides a comparable array.

    private fun brightnessToAlpha() {

        val adjustedBrightness =

            (currentBrightness.coerceIn(minBrightness, maxBrightness) * maxPanelBrightness).toInt()

            (currentBrightness.coerceIn(minBrightness, maxBrightness) * 4095).toInt()

        val targetAlpha = brightnessAlphaMap[adjustedBrightness]?.div(255.0f)

            ?: interpolateAlpha(adjustedBrightness)