oshi.hardware.platform.mac.MacDisplay Maven / Gradle / Ivy
/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.hardware.platform.mac;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.PointerByReference;
import oshi.hardware.Display;
import oshi.hardware.common.AbstractDisplay;
import oshi.jna.platform.mac.CoreFoundation;
import oshi.jna.platform.mac.CoreFoundation.CFStringRef;
import oshi.jna.platform.mac.CoreFoundation.CFTypeRef;
import oshi.jna.platform.mac.IOKit;
import oshi.util.platform.mac.CfUtil;
import oshi.util.platform.mac.IOKitUtil;
/**
* A Display
*
* @author widdis[at]gmail[dot]com
*/
public class MacDisplay extends AbstractDisplay {
private static final long serialVersionUID = 1L;
private static final Logger LOG = LoggerFactory.getLogger(MacDisplay.class);
private static final CFStringRef cfEdid = CFStringRef.toCFString("IODisplayEDID");
public MacDisplay(byte[] edid) {
super(edid);
LOG.debug("Initialized MacDisplay");
}
/**
* Gets Display Information
*
* @return An array of Display objects representing monitors, etc.
*/
public static Display[] getDisplays() {
List displays = new ArrayList();
// Iterate IO Registry IODisplayConnect
IntByReference serviceIterator = new IntByReference();
IOKitUtil.getMatchingServices("IODisplayConnect", serviceIterator);
int sdService = IOKit.INSTANCE.IOIteratorNext(serviceIterator.getValue());
while (sdService != 0) {
// Display properties are in a child entry
IntByReference properties = new IntByReference();
int ret = IOKit.INSTANCE.IORegistryEntryGetChildEntry(sdService, "IOService", properties);
if (ret == 0) {
// look up the edid by key
CFTypeRef edid = IOKit.INSTANCE.IORegistryEntryCreateCFProperty(properties.getValue(), cfEdid,
CfUtil.ALLOCATOR, 0);
if (edid != null) {
// Edid is a byte array of 128 bytes
int length = CoreFoundation.INSTANCE.CFDataGetLength(edid);
PointerByReference p = CoreFoundation.INSTANCE.CFDataGetBytePtr(edid);
displays.add(new MacDisplay(p.getPointer().getByteArray(0, length)));
CfUtil.release(edid);
}
}
// iterate
IOKit.INSTANCE.IOObjectRelease(sdService);
sdService = IOKit.INSTANCE.IOIteratorNext(serviceIterator.getValue());
}
IOKit.INSTANCE.IOObjectRelease(serviceIterator.getValue());
return displays.toArray(new Display[displays.size()]);
}
}