GLFW.m

/**
 * DisableMonitor, Disable Monitors on Mac
 *
 * Copyright (C) 2014 Tobias Salzmann
 *
 * DisableMonitor is free software: you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 *
 * DisableMonitor is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU General Public License for more details. You should have received a copy of the GNU
 * General Public License along with DisableMonitor. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Tobias Salzmann
 */

#import <IOKit/graphics/IOGraphicsLib.h>

// GLFW 3.0 START
//========================================================================
// GLFW 3.0 OS X - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================
io_service_t IOServicePortFromCGDisplayID(CGDirectDisplayID displayID)
{
    io_iterator_t iter;
    io_service_t serv, servicePort = 0;
    
    CFMutableDictionaryRef matching = IOServiceMatching("IODisplayConnect");
    
    // releases matching for us
    kern_return_t err = IOServiceGetMatchingServices(kIOMasterPortDefault,
                                                     matching,
                                                     &iter);
    if (err)
    {
        return 0;
    }
    
    while ((serv = IOIteratorNext(iter)) != 0)
    {
        CFDictionaryRef info;
        CFIndex vendorID, productID;
        CFNumberRef vendorIDRef, productIDRef;
        Boolean success;
        
        info = IODisplayCreateInfoDictionary(serv,
                                             kIODisplayOnlyPreferredName);
        
        vendorIDRef = CFDictionaryGetValue(info,
                                           CFSTR(kDisplayVendorID));
        productIDRef = CFDictionaryGetValue(info,
                                            CFSTR(kDisplayProductID));
        
        success = CFNumberGetValue(vendorIDRef, kCFNumberCFIndexType,
                                   &vendorID);
        success &= CFNumberGetValue(productIDRef, kCFNumberCFIndexType,
                                    &productID);
        
        if (!success)
        {
            CFRelease(info);
            continue;
        }
        
        if (CGDisplayVendorNumber(displayID) != vendorID ||
            CGDisplayModelNumber(displayID) != productID)
        {
            CFRelease(info);
            continue;
        }
        
        // we're a match
        servicePort = serv;
        CFRelease(info);
        break;
    }
    
    IOObjectRelease(iter);
    return servicePort;
}
// GLFW 3.0 END