FreeCAD

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#include <CoreFoundation/CoreFoundation.h>
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#include <CoreServices/CoreServices.h>
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#include <QuickLook/QuickLook.h>
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#include <Foundation/Foundation.h>
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#include <AppKit/AppKit.h>
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/* -----------------------------------------------------------------------------
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    Generate a thumbnail for file
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   This function's job is to create thumbnail for designated file as fast as possible
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   ----------------------------------------------------------------------------- */
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OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize)
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{
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  OSStatus ret = coreFoundationUnknownErr;
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  @autoreleasepool {
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    // unzip -qq -o -j -d /tmp ~/test.FCStd thumbnails/Thumbnail.png
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    //  -qq : be really quiet
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    //  -o : overwrite without prompt
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    //  -j : don't create archive paths
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    //  -d : destination path (create this path)
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    // extracts thumbnails/Thumbnail.png to /tmp/Thumbnail.png .
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    // We add a UUID and use a system temp directory here.
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    NSUUID *uuid = [NSUUID UUID];
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    NSString *uuidPath = [uuid UUIDString];
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    NSString *unzipDstPath = [NSString stringWithFormat:@"%@/%@/", NSTemporaryDirectory(), uuidPath];
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    NSString *unzipDstFile = [NSString stringWithFormat:@"%@%@", unzipDstPath, @"Thumbnail.png"];
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    NSURL *zipFile = (__bridge NSURL *)url;
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    NSTask *task = [NSTask launchedTaskWithLaunchPath:@"/usr/bin/unzip"
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                                            arguments:@[@"-qq", @"-o", @"-j", @"-d", unzipDstPath, [zipFile path], @"thumbnails/Thumbnail.png"]];
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    [task waitUntilExit];
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    //        NSLog(@"%@", unzipDstPath);
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    //        NSLog(@"%@", unzipDstFile);
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    if ( [[NSFileManager defaultManager] fileExistsAtPath:unzipDstFile] )
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    {
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      CGSize canvasSize = CGSizeMake(128, 128);
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      CGContextRef cgContext = QLThumbnailRequestCreateContext(thumbnail, /*maxSize*/canvasSize, true, NULL);
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      if(cgContext)
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      {
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        CGDataProviderRef pngDP = CGDataProviderCreateWithFilename([unzipDstFile fileSystemRepresentation]);
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        CGImageRef image = CGImageCreateWithPNGDataProvider(pngDP, NULL, true, kCGRenderingIntentDefault);
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        CGDataProviderRelease(pngDP);
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        CGContextDrawImage(cgContext,CGRectMake(0, 0, 128, 128), image);
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        QLThumbnailRequestFlushContext(thumbnail, cgContext);
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        ret = noErr;
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        CFRelease(cgContext);
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        CFRelease(image);
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      }
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    }
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    if ( [[NSFileManager defaultManager] isDeletableFileAtPath:unzipDstFile] )
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      [[NSFileManager defaultManager] removeItemAtPath:unzipDstFile error:nil];
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    if ( [[NSFileManager defaultManager] isDeletableFileAtPath:unzipDstPath] )
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      [[NSFileManager defaultManager] removeItemAtPath:unzipDstPath error:nil];
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  }
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  return ret;
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}
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void CancelThumbnailGeneration(void* thisInterface, QLThumbnailRequestRef thumbnail)
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{
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    // implement only if supported
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}
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