git.r.bdr.sh - rbdr/captura/blob - Captura/Data/GifRenderer.swift

   1 import CoreGraphics
   2 import SwiftUI
   3 /*
   4  Copyright (C) 2024 Rubén Beltrán del Río
   5
   6  This program is free software: you can redistribute it and/or modify
   7  it under the terms of the GNU General Public License as published by
   8  the Free Software Foundation, either version 3 of the License, or
   9  (at your option) any later version.
  10
  11  This program is distributed in the hope that it will be useful,
  12  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  GNU General Public License for more details.
  15
  16  You should have received a copy of the GNU General Public License
  17  along with this program. If not, see https://captura.tranquil.systems.
  18  */
  19 import UniformTypeIdentifiers
  20
  21 struct GifRenderer {
  22   static func render(_ images: [CGImage], at fps: Int, to url: URL) async {
  23     let framedelay = String(format: "%.3f", 1.0 / Double(fps))
  24     let fileProperties = [
  25       kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: 0]
  26     ]
  27     let gifProperties = [
  28       kCGImagePropertyGIFDictionary as String: [
  29         kCGImagePropertyGIFUnclampedDelayTime as String: framedelay
  30       ]
  31     ]
  32     let cfURL = url as CFURL
  33     if let destination = CGImageDestinationCreateWithURL(
  34       cfURL, UTType.gif.identifier as CFString, images.count, nil)
  35     {
  36       CGImageDestinationSetProperties(destination, fileProperties as CFDictionary?)
  37       for image in images {
  38         CGImageDestinationAddImage(destination, image, gifProperties as CFDictionary?)
  39       }
  40       CGImageDestinationFinalize(destination)
  41     }
  42   }
  43 }