36 lines
1.1 KiB
Swift
36 lines
1.1 KiB
Swift
import Foundation
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#if os(iOS)
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import UIKit
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typealias ChatMediaPlatformImage = UIImage
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#elseif os(macOS)
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import AppKit
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typealias ChatMediaPlatformImage = NSImage
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#endif
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/// SwiftUI can evaluate every visible bubble repeatedly during scrolling.
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/// Keep decoded thumbnails in a bounded native-image cache so those passes do
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/// not repeatedly decompress JPEG/HEIC data on the main actor.
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@MainActor
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enum ChatMediaImageCache {
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private static let cache: NSCache<NSString, ChatMediaPlatformImage> = {
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let cache = NSCache<NSString, ChatMediaPlatformImage>()
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cache.countLimit = 160
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cache.totalCostLimit = 48 * 1_024 * 1_024
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return cache
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}()
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static func image(
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for message: ChatMessage,
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data: Data
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) -> ChatMediaPlatformImage? {
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let cacheKey = "\(message.conversationID)\u{1F}\(message.id)" as NSString
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if let cached = cache.object(forKey: cacheKey) {
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return cached
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}
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guard let image = ChatMediaPlatformImage(data: data) else { return nil }
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cache.setObject(image, forKey: cacheKey, cost: data.count)
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return image
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}
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}
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