d7fcda345d
- Rename source module from RDReaderView to RDEpubReaderView - Move all source files from Sources/RDReaderView/ to Sources/RDEpubReaderView/ - Update podspec: RDReaderView.podspec -> RDEpubReaderView.podspec - Update Podfile, demo project, and CocoaPods config for new pod name - Delete old RDReaderView pod support files from ReadViewDemo/Pods - Add new RDEpubReaderView pod support files - Update documentation (API ref, architecture, UML, conventions, etc.) - Add FixedLayoutRotationTests - Update .gitignore: exclude .DS_Store, manual unpack backups, _ssoft-output
115 lines
3.8 KiB
Swift
115 lines
3.8 KiB
Swift
import UIKit
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#if canImport(DTCoreText)
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import DTCoreText
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#endif
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/// Chapter-level shared display content and layouter
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/// (LONG_CHAPTER_MEMORY_OPTIMIZATION_PLAN.md P1-1 / P1-3).
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///
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/// One entry holds the chapter-length display string (theme text color and
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/// dark-image adjustment injected once over the full chapter at build time)
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/// plus the DTCoreTextLayouter wrapping its framesetter. Page views reference
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/// the shared string and request per-page layout frames; they must never
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/// mutate the shared string — the framesetter and any live layout frame hold
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/// it. Page-level decoration (highlights, search, selection) is drawn by the
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/// overlay views instead.
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///
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/// Main-thread only.
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final class RDEPUBChapterDisplayContentCache {
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#if canImport(DTCoreText)
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struct Entry {
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let content: NSAttributedString
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let layouter: DTCoreTextLayouter?
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fileprivate let signature: Signature
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}
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fileprivate struct Signature: Equatable {
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let chapterContentID: ObjectIdentifier
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let contentLength: Int
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let textColor: UIColor
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let backgroundColor: UIColor
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let darkImageAdjustmentEnabled: Bool
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let darkImageBlendRatio: CGFloat
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init(page: RDEPUBTextPage, configuration: RDEPUBReaderConfiguration) {
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chapterContentID = ObjectIdentifier(page.chapterContent)
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contentLength = page.chapterContent.length
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textColor = configuration.theme.contentTextColor
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backgroundColor = configuration.theme.contentBackgroundColor
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darkImageAdjustmentEnabled = configuration.darkImageAdjustmentEnabled
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darkImageBlendRatio = configuration.darkImageBlendRatio
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}
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}
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/// Current chapter plus one adjacent chapter during page-curl/scroll
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/// transitions across a chapter boundary.
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private static let capacity = 2
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private var entries: [String: Entry] = [:]
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private var accessOrder: [String] = []
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func entry(for page: RDEPUBTextPage, configuration: RDEPUBReaderConfiguration) -> Entry {
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dispatchPrecondition(condition: .onQueue(.main))
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let signature = Signature(page: page, configuration: configuration)
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if let cached = entries[page.href], cached.signature == signature {
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touch(page.href)
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return cached
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}
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let entry = Self.buildEntry(page: page, configuration: configuration, signature: signature)
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entries[page.href] = entry
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touch(page.href)
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evictIfNeeded()
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RDEPUBMemoryProbe.log("displayContentBuilt href=\(page.href) length=\(entry.content.length)")
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return entry
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}
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func removeAll() {
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entries.removeAll()
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accessOrder.removeAll()
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}
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private func touch(_ href: String) {
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accessOrder.removeAll { $0 == href }
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accessOrder.append(href)
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}
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private func evictIfNeeded() {
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while accessOrder.count > Self.capacity {
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let evicted = accessOrder.removeFirst()
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entries.removeValue(forKey: evicted)
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}
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}
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private static func buildEntry(
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page: RDEPUBTextPage,
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configuration: RDEPUBReaderConfiguration,
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signature: Signature
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) -> Entry {
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let content = NSMutableAttributedString(attributedString: page.chapterContent)
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let fullRange = NSRange(location: 0, length: content.length)
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_ = RDEPUBDarkImageAdjuster.adjustIfNeeded(
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content,
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in: fullRange,
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configuration: configuration
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)
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content.addAttribute(
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.foregroundColor,
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value: configuration.theme.contentTextColor,
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range: fullRange
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)
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let layouter = DTCoreTextLayouter(attributedString: content)
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layouter?.shouldCacheLayoutFrames = false
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return Entry(content: content, layouter: layouter, signature: signature)
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}
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#else
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func removeAll() {}
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#endif
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}
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