Maciej Rutkowski onfoot

Nomadic Works
Poznań, Poland
https://macbirdie.net
@[email protected]
@macbirdie

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onfoot / UIImage+Decompressed.swift

Last active June 20, 2018 16:52

Create a decompressed UIImage explicitly so we're able to do it on a non-UI thread. Typically UIImage loaded from a file is decompressed into an actual bitmap lazily upon use.

	extension UIImage {
	func decompressed() -> UIImage? {
	guard let image = self.cgImage else { return nil }
	let colorSpace = CGColorSpaceCreateDeviceRGB()

	guard let context = CGContext(data: nil, width: image.width, height: image.height, bitsPerComponent: 8, bytesPerRow: image.width * 4, space: colorSpace, bitmapInfo: UInt32(CGImageAlphaInfo.premultipliedFirst.rawValue \| CGBitmapInfo.byteOrder32Little.rawValue)) else { return nil }

	let rect = CGRect(origin: .zero, size: CGSize(width: image.width, height: image.height))
	context.draw(image, in: rect)
	let decompressedImage = UIImage(cgImage: image, scale: UIScreen.main.scale, orientation: .up)

onfoot / UIImage+Decompressed.m

Last active September 10, 2021 09:21

Fast image loading code that can be used in a background thread. Essentially forces the image to be decompressed right away, not on the fly. Uses ImageIO framework.

	@implementation UIImage (Decompressed)
	+ (UIImage )decompressedImageWithContentsOfFile:(NSString )path
	{
	NSDictionary *dict = @{(id)kCGImageSourceShouldCache : @(YES)};

	NSData * data = [NSData dataWithContentsOfFile:path];

	if (data == nil) {
	return nil;
	}