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POIs there a better way for tiling Images in iphone
 

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  1. POIs there a better way for tiling Images in iphone
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    <p>Currently, trying to download the images through URLs and tiling those images in the way of how PhotoScroller app has been done by Apple store. The largest image size is 4000 * 4000 and is in RGB format. I am tiling those images with tilesize 256 * 256. It takes a very long time to tile the image and write the files on the disk. Was looking for a better approach if its possible to tile the files and load on iphone. Total of 4 URL calls and each URL call fetches an image and passes through tiling process and calls PhotoScroller app to launch those images on iphone.</p> <p>If anyone has come across such issues and know more about it, can you share some ideas.</p> <pre><code>-(void) startImageDownloading { if (!isImageRequested) { isImageRequested = YES; self.responseData = [NSMutableData data]; URL1 = @"http://www.abc.com/image_id=1&amp;size=1"; NSURLRequest *request1 = [NSURLRequest requestWithURL:[NSURL URLWithString:URL1]]; self.connection1= [[[NSURLConnection alloc] initWithRequest:request1 delegate:self] autorelease]; URL2 = @"http://www.abc.com/image_id=2&amp;size=2"; NSURLRequest *request2 = [NSURLRequest requestWithURL:[NSURL URLWithString:URL2]]; self.connection2= [[[NSURLConnection alloc] initWithRequest:request2 delegate:self] autorelease]; URL3 = @"http://www.abc.com/image_id=3&amp;size=3"; NSURLRequest *request3 = [NSURLRequest requestWithURL:[NSURL URLWithString:URL3]]; self.connection3= [[[NSURLConnection alloc] initWithRequest:request3 delegate:self] autorelease]; URL4 = @"http://www.abc.com/image_id=4&amp;size=4"; NSURLRequest *request4 = [NSURLRequest requestWithURL:[NSURL URLWithString:URL4]]; self.connection4= [[[NSURLConnection alloc] initWithRequest:request4 delegate:self] autorelease]; } } - (void)saveTilesOfSize:(CGSize)size forImage:(UIImage*)image toDirectory:(NSString*)directoryPath usingPrefix:(NSString*)prefix { CGFloat cols = [image size].width / size.width; CGFloat rows = [image size].height / size.height; int fullColumns = floorf(cols); int fullRows = floorf(rows); CGFloat remainderWidth = [image size].width - (fullColumns * size.width); CGFloat remainderHeight = [image size].height - (fullRows * size.height); if (cols &gt; fullColumns) fullColumns++; if (rows &gt; fullRows) fullRows++; CGImageRef fullImage = [image CGImage]; for (int y = 0; y &lt; fullRows; ++y) { for (int x = 0; x &lt; fullColumns; ++x) { CGSize tileSize = size; if (x + 1 == fullColumns &amp;&amp; remainderWidth &gt; 0) { // Last column tileSize.width = remainderWidth; } if (y + 1 == fullRows &amp;&amp; remainderHeight &gt; 0) { // Last row tileSize.height = remainderHeight; } CGImageRef tileImage = CGImageCreateWithImageInRect(fullImage,(CGRect){{x*size.width, y*size.height},tileSize}); NSData *imageData = UIImagePNGRepresentation([UIImage imageWithCGImage:tileImage]); CGImageRelease(tileImage); NSString *path = [NSString stringWithFormat:@"%@/%@%d_%d.png",directoryPath, prefix, x, y]; [imageData writeToFile:path atomically:NO]; } } } </code></pre>
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