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// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.ui.brightness;
/// A normalized relative brightness adjustment in the range
/// 0.0 (off/minimum) to 1.0 (maximum).
using brightness = float32;
/// Control provides an interface to manage the brightness component.
protocol Control {
/// Turns the auto-brightness mode on.
/// SetManualBrightness will turn it off.
/// Requests the current auto-brightness mode.
/// This call implements the Hanging Get protocol.
WatchAutoBrightness() -> (bool enabled);
/// Turns auto-brightness mode off.
/// Used by e.g. Settings to set manual brightness using a slider
/// Value is in the range 0.0 to 1.0 representing min to max and
/// will be clamped if out of range.
SetManualBrightness(brightness value);
/// Gets the current brightness in the range 0.0 to 1.0.
/// This result is valid for both manual and auto-brightness modes
/// and is typically used to show the current brightness on a slider.
/// This call implements the Hanging Get protocol.
WatchCurrentBrightness() -> (brightness value);
/// Sets the brightness adjustment.
/// This will change the brightness curve by the factor of the adjustment.
/// The adjustment is in the range of -1.0 to 1.0.
SetAutoBrightnessAdjustment(float32 adjustment);
/// Gets the current auto brightness adjustment.
/// This call implements the Hanging Get protocol.
WatchAutoBrightnessAdjustment() -> (float32 adjustment);
/// Sets the brightness curve as a set of points.
/// This will override the built-in brightness curve.
/// The default brightness curve will be used if the table is empty.
/// The connection will be closed if table errors are detected.
SetBrightnessTable(BrightnessTable table);
/// A tuple representing a point on the auto-brightness curve
/// Ambient_lux and nits must be positive values.
struct BrightnessPoint {
float32 ambient_lux;
float32 display_nits;
/// A set of points defining the auto-brightness curve.
/// The ambient_lux values must be monotonically increasing.
struct BrightnessTable {
vector<BrightnessPoint>:50 points;