52 lines
1.3 KiB
Swift
52 lines
1.3 KiB
Swift
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//
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// SkiaPreviewDisplayLink.swift
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// VisionCamera
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//
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// Created by Marc Rousavy on 19.07.23.
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// Copyright © 2023 mrousavy. All rights reserved.
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//
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import Foundation
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class SkiaPreviewDisplayLink {
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private var displayLink: CADisplayLink?
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private let callback: (_ timestamp: Double) -> Void
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init(callback: @escaping (_ timestamp: Double) -> Void) {
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self.callback = callback
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}
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deinit {
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stop()
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}
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@objc
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func update(_ displayLink: CADisplayLink) {
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callback(displayLink.timestamp)
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}
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func start() {
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if displayLink == nil {
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let displayLink = CADisplayLink(target: self, selector: #selector(update))
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let queue = DispatchQueue(label: "mrousavy/VisionCamera.preview",
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qos: .userInteractive,
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attributes: [],
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autoreleaseFrequency: .inherit,
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target: nil)
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queue.async {
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displayLink.add(to: .current, forMode: .common)
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self.displayLink = displayLink
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ReactLogger.log(level: .info, message: "Starting Skia Preview Display Link...")
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RunLoop.current.run()
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ReactLogger.log(level: .info, message: "Skia Preview Display Link stopped.")
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}
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}
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}
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func stop() {
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displayLink?.invalidate()
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displayLink = nil
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}
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}
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