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/*
* Copyright (C) 2013 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 org.cyanogenmod.hardware.util.FileUtils;
import java.io.File;
public class DisplayGammaCalibration {
private static final String[] GAMMA_FILE = new String[] {
"/sys/class/misc/samoled_color/red_v1_offset",
"/sys/class/misc/samoled_color/green_v1_offset",
"/sys/class/misc/samoled_color/blue_v1_offset"
};
private static final String GAMMA_FILE_V2 = "/sys/class/misc/colorcontrol/v1_offset";
public static boolean isSupported() {
if (new File(GAMMA_FILE_V2).exists()) {
return true;
}
for (String filePath : GAMMA_FILE) {
if (!new File(filePath).exists()) {
return false;
}
}
return true;
}
public static int getNumberOfControls() {
return 1;
}
public static int getMaxValue(int control) {
return 20;
}
public static int getMinValue(int control) {
return -20;
}
public static String getCurGamma(int control) {
if (new File(GAMMA_FILE_V2).exists()) {
return FileUtils.readOneLine(GAMMA_FILE_V2);
} else {
StringBuilder values = new StringBuilder();
for (String filePath : GAMMA_FILE) {
values.append(FileUtils.readOneLine(filePath)).append(" ");
}
return values.toString();
}
}
public static boolean setGamma(int control, String gamma) {
if (new File(GAMMA_FILE_V2).exists()) {
return FileUtils.writeLine(GAMMA_FILE_V2, gamma);
} else {
String[] valuesSplit = gamma.split(" ");
boolean result = true;
for (int i = 0; i < valuesSplit.length; i++) {
String targetFile = GAMMA_FILE[i];
result &= FileUtils.writeLine(targetFile, valuesSplit[i]);
}
return result;
}
}
}
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