implement save request on OSX, add Quick Look extentions

PanoThumb/ThumbnailProvider.m

@@ -0,0 +1,63 @@
+//
+//  ThumbnailProvider.m
+//  PanoThumb
+//
+//  Created by Omar Mohamed Ali Mudhir on 15/06/18.
+//  Copyright © 2018 OmixLab ltd. All rights reserved.
+//
+
+#import "ThumbnailProvider.h"
+
+@implementation ThumbnailProvider
+
+- (void)provideThumbnailForFileRequest:(QLFileThumbnailRequest *)request completionHandler:(void (^)(QLThumbnailReply * _Nullable, NSError * _Nullable))handler {
+    
+    // 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 replyWithContextSize:request.maximumSize currentContextDrawingBlock:^BOOL {
+        // Draw the thumbnail here.
+        // Return YES if the thumbnail was successfully drawn inside this block.
+        return YES;
+    }], nil);
+*/
+    
+    // Second way: Draw the thumbnail into a context passed to your block, set up with Core Graphics' coordinate system.
+    
+    CGRect r = CGRectMake(0, 0, 128, 128);
+    
+    handler([QLThumbnailReply replyWithContextSize:r.size drawingBlock:^BOOL(CGContextRef  _Nonnull context) {
+        // Draw the thumbnail here.
+
+        NSLog(@"thumbnail generated");
+        NSURL* u = [request fileURL];
+        FILE* fp = fopen([u fileSystemRepresentation], "rb");
+        if (fp)
+        {
+            int h[3];
+            fread(h, sizeof(int), 3, fp);
+
+            //uint8_t* data = (uint8_t*)malloc(h[0]*h[1]*h[2]);
+            CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+            CGContextRef bmp = CGBitmapContextCreate(NULL, h[0], h[1], 8, h[0]*h[2], colorSpace, kCGImageAlphaPremultipliedLast);
+            uint8_t* data = CGBitmapContextGetData(bmp);
+            fread(data, h[0]*h[1]*h[2], 1, fp);
+            fclose(fp);
+     
+            CGImageRef img = CGBitmapContextCreateImage(bmp);
+            CGRect r2 = CGRectMake(0, 0, 128*request.scale, 128*request.scale);
+            CGContextDrawImage(context, r2, img);
+        }
+
+        // Return YES if the thumbnail was successfully drawn inside this block.
+        return YES;
+    }], nil);
+  /*
+    // Third way: Set an image file URL.
+    handler([QLThumbnailReply replyWithImageFileURL:[NSBundle.mainBundle URLForResource:@"fileThumbnail" withExtension:@"jpg"]], nil);
+    
+    */
+}
+
+@end