import AppKit
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import CoreGraphics
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import Darwin
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import Foundation
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import AlignerCore
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final class SkyLightSpaceEnumerator: SpaceEnumeratorProtocol {
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enum SkyLightError: Error, CustomStringConvertible {
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case frameworkUnavailable
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case symbolUnavailable(String)
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case managedDisplaySpacesUnavailable
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var description: String {
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switch self {
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case .frameworkUnavailable:
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return "SkyLight framework could not be opened."
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case .symbolUnavailable(let name):
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return "SkyLight symbol unavailable: \(name)."
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case .managedDisplaySpacesUnavailable:
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return "CGSCopyManagedDisplaySpaces returned no usable data."
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}
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}
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}
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private typealias CGSMainConnectionIDFunction = @convention(c) () -> UInt32
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private typealias CGSCopyManagedDisplaySpacesFunction = @convention(c) (UInt32) -> Unmanaged<CFArray>?
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private typealias CGSCopySpacesForWindowsFunction = @convention(c) (UInt32, UInt32, CFArray) -> Unmanaged<CFArray>?
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private let handle: UnsafeMutableRawPointer?
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private let mainConnectionID: CGSMainConnectionIDFunction
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private let copyManagedDisplaySpaces: CGSCopyManagedDisplaySpacesFunction
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private let copySpacesForWindows: CGSCopySpacesForWindowsFunction?
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init() throws {
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guard let handle = dlopen("/System/Library/PrivateFrameworks/SkyLight.framework/SkyLight", RTLD_LAZY) else {
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throw SkyLightError.frameworkUnavailable
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}
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self.handle = handle
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self.mainConnectionID = try Self.symbol("CGSMainConnectionID", in: handle)
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self.copyManagedDisplaySpaces = try Self.symbol("CGSCopyManagedDisplaySpaces", in: handle)
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self.copySpacesForWindows = try? Self.symbol("CGSCopySpacesForWindows", in: handle)
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}
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deinit {
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if let handle {
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dlclose(handle)
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}
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}
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func displays() throws -> [AlignerDisplay] {
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let displayRecords = try managedDisplaySpaceRecords()
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let physicalDisplayUUIDs = Self.physicalDisplayUUIDs()
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let records = displayRecords.flatMap { displayRecord -> [SpaceEnumerationRecord] in
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let displayUUID = stringValue(displayRecord["Display Identifier"])
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let spaceRecords = displayRecord["Spaces"] as? [[String: Any]] ?? []
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return spaceRecords.compactMap { spaceRecord in
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guard let id = uint64Value(spaceRecord["id64"] ?? spaceRecord["id"]) else {
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return nil
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}
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return SpaceEnumerationRecord(
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id: id,
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cgsType: intValue(spaceRecord["type"]) ?? -1,
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displayUUID: displayUUID
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)
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}
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}
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return SpaceEnumerationPolicy.normalizedDisplays(
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from: records,
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physicalDisplayUUIDs: physicalDisplayUUIDs
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)
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}
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func currentOverlayScreenSpaceStatesByDisplayUUID() throws -> [String: OverlayScreenSpaceState] {
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let displayRecords = try managedDisplaySpaceRecords()
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var result: [String: OverlayScreenSpaceState] = [:]
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for displayRecord in displayRecords {
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let displayUUID = stringValue(displayRecord["Display Identifier"])
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guard !displayUUID.isEmpty,
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let currentSpace = displayRecord["Current Space"] as? [String: Any]
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else {
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continue
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}
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let isFullscreen = SpaceEnumerationPolicy.spaceType(fromCGSType: intValue(currentSpace["type"]) ?? -1) == .fullscreen
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result[displayUUID] = OverlayScreenSpaceState(
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isFullscreenSpace: isFullscreen,
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isSplitViewSpace: Self.isSplitViewSpace(currentSpace)
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)
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}
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return result
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}
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func currentSpaceIDs() throws -> Set<UInt64> {
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let displayRecords = try managedDisplaySpaceRecords()
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var result = Set<UInt64>()
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for displayRecord in displayRecords {
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guard let currentSpace = displayRecord["Current Space"] as? [String: Any],
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let id = uint64Value(currentSpace["id64"] ?? currentSpace["id"])
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else {
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continue
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}
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result.insert(id)
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}
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return result
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}
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func spaceIDsByWindowID(windowIDs: [UInt32]) -> [UInt32: [UInt64]] {
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guard let copySpacesForWindows else { return [:] }
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let connectionID = mainConnectionID()
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var result: [UInt32: [UInt64]] = [:]
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for windowID in windowIDs {
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let windowIDArray = [NSNumber(value: windowID)] as CFArray
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guard let unmanagedSpaces = copySpacesForWindows(connectionID, 0x7, windowIDArray) else {
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continue
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}
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let spaces = (unmanagedSpaces.takeRetainedValue() as? [Any] ?? [])
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.compactMap { item -> UInt64? in
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uint64Value(item)
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}
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if !spaces.isEmpty {
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result[windowID] = spaces
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}
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}
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return result
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}
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private static func symbol<T>(_ name: String, in handle: UnsafeMutableRawPointer) throws -> T {
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guard let rawSymbol = dlsym(handle, name) else {
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throw SkyLightError.symbolUnavailable(name)
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}
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return unsafeBitCast(rawSymbol, to: T.self)
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}
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private func managedDisplaySpaceRecords() throws -> [[String: Any]] {
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let connectionID = mainConnectionID()
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guard
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let unmanagedDisplays = copyManagedDisplaySpaces(connectionID),
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let displayRecords = unmanagedDisplays.takeRetainedValue() as? [[String: Any]]
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else {
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throw SkyLightError.managedDisplaySpacesUnavailable
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}
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return displayRecords
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}
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private static func isSplitViewSpace(_ spaceRecord: [String: Any]) -> Bool {
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guard let tileLayoutManager = spaceRecord["TileLayoutManager"] as? [String: Any] else {
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return false
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}
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if let tileSpaces = tileLayoutManager["TileSpaces"] as? [Any] {
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return tileSpaces.count > 1
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}
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return true
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}
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private static func physicalDisplayUUIDs() -> Set<String> {
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Set(
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NSScreen.screens.compactMap { screen in
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guard
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let number = screen.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? NSNumber,
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let unmanagedUUID = CGDisplayCreateUUIDFromDisplayID(CGDirectDisplayID(number.uint32Value))
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else {
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return nil
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}
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let uuid = unmanagedUUID.takeRetainedValue()
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return CFUUIDCreateString(nil, uuid) as String?
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}
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)
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}
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}
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private func stringValue(_ value: Any?) -> String {
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value as? String ?? ""
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}
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private func intValue(_ value: Any?) -> Int? {
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switch value {
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case let number as NSNumber:
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return number.intValue
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case let int as Int:
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return int
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default:
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return nil
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}
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}
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private func uint64Value(_ value: Any?) -> UInt64? {
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switch value {
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case let number as NSNumber:
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return number.uint64Value
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case let uint64 as UInt64:
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return uint64
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case let uint as UInt:
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return UInt64(uint)
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case let int as Int where int >= 0:
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return UInt64(int)
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default:
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return nil
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}
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}
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