Warning, /graphics/krita/krita/integration/quicklookng/ThumbnailProvider.swift is written in an unsupported language. File is not indexed.

 /*
  * This file is part of Krita
  *
  * Copyright (c) 2020 L. E. Segovia <amy@amyspark.me>
  *
  *  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 2 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, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  * USA.
  */
 
 import AppKit
 import QuickLookThumbnailing
 
 class ThumbnailProvider: QLThumbnailProvider {
 
     override func provideThumbnail(for request: QLFileThumbnailRequest, _ handler: @escaping (QLThumbnailReply?, Error?) -> Void) {
 
         // There are three ways to provide a thumbnail through a QLThumbnailReply. Only one of them should be used.
 
         // First way: Draw the thumbnail into the current context, set up with UIKit's coordinate system.
         /* handler(QLThumbnailReply(contextSize: request.maximumSize, currentContextDrawing: { () -> Bool in
             // Draw the thumbnail here.
 
             // Return true if the thumbnail was successfully drawn inside this block.
             return true
         }), nil) */
 
 
 
         // Second way: Draw the thumbnail into a context passed to your block, set up with Core Graphics's coordinate system.
         handler(QLThumbnailReply(contextSize: request.maximumSize, drawing: { (context: CGContext) -> Bool in
             // Draw the thumbnail here.
 
             var appPlist = UnzipTask(request.fileURL.path, "preview.png")
 
             // Not made with Krita. Find ORA thumbnail instead.
             if (appPlist == nil || appPlist!.isEmpty) {
               appPlist =
                 UnzipTask(request.fileURL.path, "Thumbnails/thumbnail.png");
             }
 
             if (appPlist != nil && !appPlist!.isEmpty) {
               let appIcon = NSImage.init(data: appPlist!);
 
               let rep = appIcon!.representations.first!;
 
               var renderRect = NSMakeRect(0.0, 0.0, CGFloat(rep.pixelsWide), CGFloat(rep.pixelsHigh));
 
               let cgImage = appIcon?.cgImage(forProposedRect: &renderRect, context: nil, hints: nil);
 
               context.draw(cgImage!, in: renderRect);
             } else {
               return false;
             }
 
             // Return true if the thumbnail was successfully drawn inside this block.
             return true
         }), nil)
 
         // Third way: Set an image file URL.
         /* handler(QLThumbnailReply(imageFileURL: Bundle.main.url(forResource: "fileThumbnail", withExtension: "jpg")!), nil) */
     }
 }