integration/quicklook/GeneratePreviewForURL.m

0001 /*
0002  * This file is part of Krita
0003  *
0004  * Copyright (c) 2015 Algorithmus <angelus.tenebrae@gmail.com>
0005  * Copyright (c) 2015 beelzy <alvina.lee@innoactive.de>
0006  * Copyright (c) 2020 L. E. Segovia <amy@amyspark.me>
0007  *
0008  *  This program is free software; you can redistribute it and/or modify
0009  *  it under the terms of the GNU General Public License as published by
0010  *  the Free Software Foundation; either version 2 of the License, or
0011  *  (at your option) any later version.
0012  *
0013  *  This program is distributed in the hope that it will be useful,
0014  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
0015  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0016  *  GNU General Public License for more details.
0017  *
0018  *  You should have received a copy of the GNU General Public License
0019  *  along with this program; if not, write to the Free Software
0020  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
0021  * USA.
0022  */
0023
0024 #include "UnzipTask.h"
0025 #import <Cocoa/Cocoa.h>
0026 #include <CoreFoundation/CoreFoundation.h>
0027 #include <CoreServices/CoreServices.h>
0028 #include <QuickLook/QuickLook.h>
0029
0030 OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview,
0031                                CFURLRef url, CFStringRef contentTypeUTI,
0032                                CFDictionaryRef options);
0033 void CancelPreviewGeneration(void *thisInterface, QLPreviewRequestRef preview);
0034
0035 /* -----------------------------------------------------------------------------
0036    Generate a preview for file
0037
0038    This function's job is to create preview for designated file
0039    -----------------------------------------------------------------------------
0040  */
0041
0042 OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview,
0043                                CFURLRef url, CFStringRef contentTypeUTI,
0044                                CFDictionaryRef options) {
0045   @autoreleasepool {
0046     NSData *appPlist =
0047         UnzipTask([(__bridge NSURL *)url path], @"mergedimage.png");
0048
0049     if (QLPreviewRequestIsCancelled(preview)) {
0050       return noErr;
0051     }
0052
0053     if ([appPlist length]) {
0054       NSImage *appIcon = [[NSImage alloc] initWithData:appPlist];
0055
0056       NSImageRep *rep = [[appIcon representations] objectAtIndex:0];
0057
0058       NSSize canvasSize = NSMakeSize(rep.pixelsWide, rep.pixelsHigh);
0059       NSRect renderRect = NSMakeRect(0.0, 0.0, rep.pixelsWide, rep.pixelsHigh);
0060
0061       CGContextRef _context =
0062           QLPreviewRequestCreateContext(preview, canvasSize, true, NULL);
0063
0064       if (_context) {
0065         NSGraphicsContext *_graphicsContext =
0066             [NSGraphicsContext graphicsContextWithGraphicsPort:_context
0067                                                        flipped:NO];
0068
0069         [NSGraphicsContext setCurrentContext:_graphicsContext];
0070         [appIcon drawInRect:renderRect];
0071
0072         QLPreviewRequestFlushContext(preview, _context);
0073         CFRelease(_context);
0074       }
0075
0076       return noErr;
0077     }
0078
0079     return NSFileNoSuchFileError;
0080   }
0081 }
0082
0083 void CancelPreviewGeneration(void *thisInterface, QLPreviewRequestRef preview) {
0084   // Implement only if supported
0085 }