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Use image cached provider to reuse asset when creating RootAnimationL…
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47 changes: 47 additions & 0 deletions
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Sources/Private/MainThread/LayerContainers/Utility/CachedImageProvider.swift
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| @@ -0,0 +1,47 @@ | ||
| // Created by Jianjun Wu on 2022/5/12. | ||
| // Copyright © 2022 Airbnb Inc. All rights reserved. | ||
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| import CoreGraphics | ||
| import Foundation | ||
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| // MARK: - CachedImageProvider | ||
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| private final class CachedImageProvider: AnimationImageProvider { | ||
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| // MARK: Lifecycle | ||
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| /// Initializes an image provider with an image provider | ||
| /// | ||
| /// - Parameter imageProvider: The provider to load image from asset | ||
| /// | ||
| public init(imageProvider: AnimationImageProvider) { | ||
| self.imageProvider = imageProvider | ||
| } | ||
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| // MARK: Public | ||
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| public func imageForAsset(asset: ImageAsset) -> CGImage? { | ||
| if let image = imageCache.object(forKey: asset.id as NSString) { | ||
| return image | ||
| } | ||
| if let image = imageProvider.imageForAsset(asset: asset) { | ||
| imageCache.setObject(image, forKey: asset.id as NSString) | ||
| return image | ||
| } | ||
| return nil | ||
| } | ||
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| // MARK: Internal | ||
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| let imageCache: NSCache<NSString, CGImage> = .init() | ||
| let imageProvider: AnimationImageProvider | ||
| } | ||
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| extension AnimationImageProvider { | ||
| /// Create a cache enabled image provider which will reuse the asset image with the same asset id | ||
| /// It wraps the current provider as image loader, and uses `NSCache` to cache the images for resue. | ||
| /// The cache will be reset when the `animation` is reset. | ||
| var cachedImageProvider: AnimationImageProvider { | ||
| CachedImageProvider(imageProvider: self) | ||
| } | ||
| } |
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