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/*
* Copyright (C) 2015-2016 The CyanogenMod 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 org.cyanogenmod.hardware;
import cyanogenmod.hardware.DisplayMode;
import org.cyanogenmod.internal.util.FileUtils;
import java.util.Arrays;
/*
* Display Modes API
*
* A device may implement a list of preset display modes for different
* viewing intents, such as movies, photos, or extra vibrance. These
* modes may have multiple components such as gamma correction, white
* point adjustment, etc, but are activated by a single control point.
*
* This API provides support for enumerating and selecting the
* modes supported by the hardware.
*/
public class DisplayModeControl {
private static final String MODE_PATH = "/sys/class/mdnie/mdnie/mode";
private static final String MAX_PATH = "/sys/class/mdnie/mdnie/mode_max";
private static final String DEFAULT_PATH = "/data/misc/.displaymodedefault";
private static final DisplayMode[] DISPLAY_MODES = {
new DisplayMode(0, "Dynamic"),
new DisplayMode(1, "Standard"),
new DisplayMode(2, "Natural"),
new DisplayMode(3, "Cinema"),
new DisplayMode(4, "Adaptive"),
};
static {
if (FileUtils.isFileReadable(DEFAULT_PATH)) {
setMode(getDefaultMode(), false);
} else if (FileUtils.isFileReadable(MODE_PATH)) {
/* If default mode is not set yet, set current mode as default */
setMode(getCurrentMode(), true);
}
}
/*
* All HAF classes should export this boolean.
* Real implementations must, of course, return true
*/
public static boolean isSupported() {
return FileUtils.isFileWritable(MODE_PATH) &&
FileUtils.isFileReadable(MODE_PATH) &&
FileUtils.isFileWritable(DEFAULT_PATH) &&
FileUtils.isFileReadable(DEFAULT_PATH);
}
/*
* Get the list of available modes. A mode has an integer
* identifier and a string name.
*
* It is the responsibility of the upper layers to
* map the name to a human-readable format or perform translation.
*/
public static DisplayMode[] getAvailableModes() {
/* node is unreadable */
if (!FileUtils.isFileReadable(MAX_PATH)) {
return DISPLAY_MODES;
}
int max;
try {
max = Integer.parseInt(FileUtils.readOneLine(MAX_PATH));
} catch (NumberFormatException e) {
/* max is not an integer */
return DISPLAY_MODES;
}
/* max is invalid */
return Arrays.copyOfRange(DISPLAY_MODES, 0,
max >= 0 ? max : DISPLAY_MODES.length);
}
/*
* Get the name of the currently selected mode. This can return
* null if no mode is selected.
*/
public static DisplayMode getCurrentMode() {
try {
int mode = Integer.parseInt(FileUtils.readOneLine(MODE_PATH));
return DISPLAY_MODES[mode];
} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
return null;
}
}
/*
* Selects a mode from the list of available modes by it's
* string identifier. Returns true on success, false for
* failure. It is up to the implementation to determine
* if this mode is valid.
*/
public static boolean setMode(DisplayMode mode, boolean makeDefault) {
if (mode == null) {
return false;
}
boolean success = FileUtils.writeLine(MODE_PATH, String.valueOf(mode.id));
if (success && makeDefault) {
return FileUtils.writeLine(DEFAULT_PATH, String.valueOf(mode.id));
}
return success;
}
/*
* Gets the preferred default mode for this device by it's
* string identifier. Can return null if there is no default.
*/
public static DisplayMode getDefaultMode() {
try {
int mode = Integer.parseInt(FileUtils.readOneLine(DEFAULT_PATH));
return DISPLAY_MODES[mode];
} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
return null;
}
}
}
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