Maciej Rutkowski onfoot
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.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| @implementation UIImage (Decompressed) | |
| + (UIImage *)decompressedImageWithContentsOfFile:(NSString *)path | |
| { | |
| NSDictionary *dict = @{(id)kCGImageSourceShouldCache : @(YES)}; | |
| NSData * data = [NSData dataWithContentsOfFile:path]; | |
| if (data == nil) { | |
| return nil; | |
| } |
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.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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) |