Swiftgram/TelegramUI/ImageCompression.swift

import Foundation
import AVFoundation
import UIKit

func compressImageToJPEG(_ image: UIImage, quality: Float) -> Data? {
    let data = NSMutableData()
    guard let destination = CGImageDestinationCreateWithData(data as CFMutableData, "public.jpeg" as CFString, 1, nil) else {
        return nil
    }
    
    let options = NSMutableDictionary()
    options.setObject(quality as NSNumber, forKey: kCGImageDestinationLossyCompressionQuality as NSString)
    
    guard let cgImage = image.cgImage else {
        return nil
    }
    CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
    CGImageDestinationFinalize(destination)
    
    if data.length == 0 {
        return nil
    }
    
    return data as Data
}

@available(iOSApplicationExtension 11.0, *)
func compressImage(_ image: UIImage, quality: Float) -> Data? {
    let data = NSMutableData()
    guard let destination = CGImageDestinationCreateWithData(data as CFMutableData, AVFileType.heic as CFString, 1, nil) else {
        return nil
    }
    
    let options = NSMutableDictionary()
    options.setObject(quality as NSNumber, forKey: kCGImageDestinationLossyCompressionQuality as NSString)
    
    guard let cgImage = image.cgImage else {
        return nil
    }
    CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
    CGImageDestinationFinalize(destination)
    
    if data.length == 0 {
        return nil
    }
    
    return data as Data
}