https://github.com/juniperphoton/hdrmemoryissuedemo

https://github.com/juniperphoton/hdrmemoryissuedemo

Last synced: 26 days ago
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• Host: GitHub
• URL: https://github.com/juniperphoton/hdrmemoryissuedemo
• Owner: JuniperPhoton
• Created: 2024-01-27T16:14:07.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2024-08-11T14:15:08.000Z (5 months ago)
• Last Synced: 2024-08-11T15:32:15.851Z (5 months ago)
• Language: Swift
• Size: 19.5 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# HDR Memory issue demo

> NOTE: It seems like iOS 18 Beta 5 has resolved this issue.

This demo illustrates a memory leak issue when loading HDR images. After building the demo and installing the app, you can recreate this issue by:

- Clicking the button above to select images.

- Once the image is loaded, tap to load the full-size image.

- By switching between different images, you'll notice the app's memory usage continually increasing.

- Tapping the "Remove all" button won't reduce memory usage as expected.

- A memory graph debug will show that no memory is leaked by this app. Turning off HDR also prevents this issue.

Please note the issue was replicated in the following environments:

- Xcode 15.2

- iPhone 15 Pro with iOS 17.2

**Still no workaround for this issue**

This repo contains minimum code to reproduce this issue. If you are interested in some key parts of this repo, please keep reading.

## Load UIImage from PHAsset with HDR enabled

```swift

func fetchUIImage(phAsset: PHAsset, showsHDR: Bool) async -> UIImage? {

    return await withCheckedContinuation { continuation in

        let cacheManager = PHCachingImageManager.default()

        

        cacheManager.requestImageDataAndOrientation(for: phAsset, options: nil) { data, _, orientation, _ in

            guard let data = data else {

                return continuation.resume(returning: nil)

            }

            

            var configuration = UIImageReader.Configuration()

            configuration.prefersHighDynamicRange = showsHDR

            let reader = UIImageReader(configuration: configuration)

            let image = reader.image(data: data)

            continuation.resume(returning: image)

        }

    }

}

```

## Display UIImage with HDR enabled using SwiftUI's Image view

```swift

Image(uiImage: uiImage)

    .resizable()

    .scaledToFit()

    .allowedDynamicRange(.high)

    .clipped()

```

## Display UIImage with HDR enabled using UIImageView

```swift

private struct ImageViewBridge: UIViewRepresentable {

    static func dismantleUIView(_ uiView: UIImageView, coordinator: ()) {

        uiView.image = nil

    }

    

    let uiImage: UIImage

    

    func makeUIView(context: Context) -> UIImageView {

        let view = UIImageView(image: uiImage)

        view.contentMode = .scaleAspectFit

        view.preferredImageDynamicRange = .high

        view.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)

        view.setContentCompressionResistancePriority(.defaultLow, for: .vertical)

        view.setContentHuggingPriority(.required, for: .horizontal)

        view.setContentHuggingPriority(.required, for: .vertical)

        return view

    }

    

    func updateUIView(_ uiView: UIImageView, context: Context) {

        uiView.image = uiImage

    }

}

```