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