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[rbdr/captura] / Captura / Core Extensions / CVImageBuffer+cgImage.swift

/*
 Copyright (C) 2024 Rubén Beltrán del Río

 This program 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 3 of the License, or
 (at your option) any later version.

 This program 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 this program. If not, see https://captura.tranquil.systems.
 */
import Foundation
import ReplayKit

extension CVImageBuffer {

  private static let contextQueue = DispatchQueue(label: "com.example.contextQueue")
  static let sharedContext: CIContext = {
    return CIContext()
  }()

  var cgImage: CGImage? {
    var result: CGImage?
    CVImageBuffer.contextQueue.sync {
      let ciImage = CIImage(cvImageBuffer: self)
      let width = CVPixelBufferGetWidth(self)
      let height = CVPixelBufferGetHeight(self)
      result = CVImageBuffer.sharedContext.createCGImage(
        ciImage, from: CGRect(x: 0, y: 0, width: width, height: height))
    }
    return result
  }
}