d15f20b097
- 拆分 ContentDelegates/TextContentView 为独立协调器（InteractionCoordinator、LocationResolution、ExternalLinks、AttachmentTooltip） - 新增 RDEPUBAttachmentTooltipView/OverlayView 附件气泡提示 - 新增 RDEPUBDarkImageAdjuster 暗色模式图片亮度适配 - 新增 RDEPUBSelectionLoupeView 选区放大镜 - 新增 MetadataParseWorker/CancellationController 元数据解析取消机制 - 重构 PresentationRuntime/PaginationCoordinator 精简职责 - 优化 ChapterLoader/WarmupOrchestrator 异步章节加载 - CFI 模块微调与 NoteModels 更新 - 清理冗余文档，更新架构/UML/业务逻辑文档 Co-Authored-By: Claude <noreply@anthropic.com>
93 lines
3.8 KiB
Swift
93 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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enum RDEPUBDarkImageAdjuster {
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private static let imageCache = NSCache<NSString, UIImage>()
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#if canImport(DTCoreText)
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static func adjustIfNeeded(
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_ content: NSMutableAttributedString,
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configuration: RDEPUBReaderConfiguration
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) -> NSMutableAttributedString {
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guard configuration.darkImageAdjustmentEnabled,
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configuration.darkImageBlendRatio > 0,
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configuration.theme.contentBackgroundColor.rd_isDarkBackground else {
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return content
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}
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let fullRange = NSRange(location: 0, length: content.length)
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content.enumerateAttribute(.attachment, in: fullRange) { value, range, _ in
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guard let attachment = value as? DTImageTextAttachment,
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!isCoverAttachment(attachment),
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let image = attachment.image,
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shouldAdjust(image) else { return }
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let adjustedAttachment = DTImageTextAttachment()
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adjustedAttachment.image = adjustedImage(
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image,
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backgroundColor: configuration.theme.contentBackgroundColor,
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blendRatio: configuration.darkImageBlendRatio,
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cacheKey: cacheKey(for: attachment, image: image, configuration: configuration)
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)
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adjustedAttachment.originalSize = attachment.originalSize
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adjustedAttachment.displaySize = attachment.displaySize
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adjustedAttachment.verticalAlignment = attachment.verticalAlignment
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adjustedAttachment.contentURL = attachment.contentURL
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adjustedAttachment.hyperLinkURL = attachment.hyperLinkURL
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adjustedAttachment.hyperLinkGUID = attachment.hyperLinkGUID
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adjustedAttachment.attributes = attachment.attributes
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content.addAttribute(.attachment, value: adjustedAttachment, range: range)
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}
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return content
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}
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private static func isCoverAttachment(_ attachment: DTTextAttachment) -> Bool {
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let lowercasedClasses = ((attachment.attributes["class"] as? String) ?? "").lowercased()
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let lowercasedPath = attachment.contentURL?.lastPathComponent.lowercased()
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?? ((attachment.attributes["src"] as? String) ?? "").lowercased()
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return lowercasedClasses.contains("rd-front-cover-image") || lowercasedPath.contains("cover")
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}
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private static func shouldAdjust(_ image: UIImage) -> Bool {
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image.size.width >= 80 && image.size.height >= 80
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}
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private static func cacheKey(
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for attachment: DTImageTextAttachment,
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image: UIImage,
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configuration: RDEPUBReaderConfiguration
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) -> NSString {
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let source = attachment.contentURL?.absoluteString
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?? "\(Unmanaged.passUnretained(image).toOpaque())"
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return "\(source)|\(image.size.width)x\(image.size.height)|\(configuration.theme.contentBackgroundColor.rd_cssString)|\(configuration.darkImageBlendRatio)" as NSString
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}
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private static func adjustedImage(
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_ image: UIImage,
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backgroundColor: UIColor,
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blendRatio: CGFloat,
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cacheKey: NSString
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) -> UIImage {
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if let cached = imageCache.object(forKey: cacheKey) { return cached }
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let format = UIGraphicsImageRendererFormat()
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format.scale = image.scale
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format.opaque = false
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let renderer = UIGraphicsImageRenderer(size: image.size, format: format)
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let adjusted = renderer.image { context in
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image.draw(in: CGRect(origin: .zero, size: image.size))
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backgroundColor.withAlphaComponent(max(0, min(0.35, blendRatio))).setFill()
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context.cgContext.setBlendMode(.sourceAtop)
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context.fill(CGRect(origin: .zero, size: image.size))
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}
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imageCache.setObject(adjusted, forKey: cacheKey)
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return adjusted
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}
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#endif
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}
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