oshi.driver.unix.Xrandr Maven / Gradle / Ivy
/**
* MIT License
*
* Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package oshi.driver.unix;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.ExecutingCommand;
import oshi.util.ParseUtil;
/**
* Utility to query xrandr
*/
@ThreadSafe
public final class Xrandr {
private Xrandr() {
}
public static List getEdidArrays() {
List xrandr = ExecutingCommand.runNative("xrandr --verbose");
// xrandr reports edid in multiple lines. After seeing a line containing
// EDID, read subsequent lines of hex until 256 characters are reached
if (xrandr.isEmpty()) {
return Collections.emptyList();
}
List displays = new ArrayList<>();
StringBuilder sb = null;
for (String s : xrandr) {
if (s.contains("EDID")) {
sb = new StringBuilder();
} else if (sb != null) {
sb.append(s.trim());
if (sb.length() < 256) {
continue;
}
String edidStr = sb.toString();
byte[] edid = ParseUtil.hexStringToByteArray(edidStr);
if (edid.length >= 128) {
displays.add(edid);
}
sb = null;
}
}
return displays;
}
}