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increase image cache to 128 MiB and fix perf for calculating image cost

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Vegard Bieker Matthey
2025-08-03 18:38:56 +02:00
parent 6a9dbe2f0b
commit 1d1e2db9ce
1 changed files with 13 additions and 7 deletions
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20
ImageViewer/ViewController.swift
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@@ -1250,7 +1250,8 @@ class ImageLoader {
private var loadingTasks: [String: [((UIImage?) -> Void)]] = [:] private var loadingTasks: [String: [((UIImage?) -> Void)]] = [:]
init() { init() {
cache.totalCostLimit = 50 * 1024 * 1024 // 128 MiB
cache.totalCostLimit = 128 * 1024 * 1024
} }
func preloadImage(at path: URL) { func preloadImage(at path: URL) {
@@ -1277,13 +1278,13 @@ class ImageLoader {
let image = UIImage(contentsOfFile: path.path) let image = UIImage(contentsOfFile: path.path)
DispatchQueue.main.async { if let image = image, let cost = imageByteSize(image) {
if let image = image, let data = image.pngData() { self.cache.setObject(image, forKey: path.path as NSString, cost: cost)
self.cache.setObject(image, forKey: path.path as NSString, cost: data.count) } else {
} else { print("no image to cache found")
print("no image to cache found") }
}
DispatchQueue.main.async {
self.loadingTasks[path.path]?.forEach { $0(image) } self.loadingTasks[path.path]?.forEach { $0(image) }
self.loadingTasks.removeValue(forKey: path.path) self.loadingTasks.removeValue(forKey: path.path)
} }
@@ -1294,3 +1295,8 @@ class ImageLoader {
return cache.object(forKey: path as NSString) return cache.object(forKey: path as NSString)
} }
} }
func imageByteSize(_ image: UIImage) -> Int? {
guard let cgImage = image.cgImage else { return nil }
return cgImage.bytesPerRow * cgImage.height
}