// NSImageExtensions.swift - Copyright 2024 SwifterSwift
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#if canImport(AppKit) && !targetEnvironment(macCatalyst)
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import AppKit
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// MARK: - Methods
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public extension NSImage {
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/// SwifterSwift: NSImage scaled to maximum size with respect to aspect ratio.
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///
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/// - Parameter maxSize: maximum size
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/// - Returns: scaled NSImage
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func scaled(toMaxSize maxSize: NSSize) -> NSImage {
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let imageWidth = size.width
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let imageHeight = size.height
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guard imageHeight > 0 else { return self }
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// Get ratio (landscape or portrait)
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let ratio: CGFloat = if imageWidth > imageHeight {
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// Landscape
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maxSize.width / imageWidth
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} else {
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// Portrait
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maxSize.height / imageHeight
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}
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// Calculate new size based on the ratio
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let newWidth = imageWidth * ratio
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let newHeight = imageHeight * ratio
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// Create a new NSSize object with the newly calculated size
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let newSize = NSSize(width: newWidth.rounded(.down), height: newHeight.rounded(.down))
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// Cast the NSImage to a CGImage
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var imageRect = CGRect(origin: .zero, size: size)
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guard let imageRef = cgImage(forProposedRect: &imageRect, context: nil, hints: nil) else { return self }
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return NSImage(cgImage: imageRef, size: newSize)
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}
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/// SwifterSwift: Write NSImage to url.
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///
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/// - Parameters:
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/// - url: Desired file URL.
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/// - type: Type of image (default is .jpeg).
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/// - compressionFactor: used only for JPEG files. The value is a float between 0.0 and 1.0, with 1.0 resulting in
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/// no compression and 0.0 resulting in the maximum compression possible.
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func write(to url: URL, fileType type: NSBitmapImageRep.FileType = .jpeg, compressionFactor: NSNumber = 1.0) {
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// https://stackoverflow.com/a/45042611/3882644
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guard let data = tiffRepresentation else { return }
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guard let imageRep = NSBitmapImageRep(data: data) else { return }
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guard let imageData = imageRep.representation(using: type, properties: [.compressionFactor: compressionFactor]) else { return }
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try? imageData.write(to: url)
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}
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}
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#endif
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