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Add Foundation Models 27 prompt attachments #310
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| import Foundation | ||
|
|
||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| import CoreGraphics | ||
| import ImageIO | ||
| #endif | ||
|
|
||
| /// A typed prompt attachment, following Foundation Models 27's image surface. | ||
| /// | ||
| /// AnyLanguageModel lowers image attachments into its existing compatibility | ||
| /// transcript image segments on deployment targets before OS 27. | ||
| public struct Attachment<Content> { | ||
| let content: Content | ||
| } | ||
|
|
||
| /// Image content retained until a prompt is lowered into the compatibility transcript. | ||
| public struct ImageAttachmentContent: Sendable, Equatable { | ||
| enum Source: Sendable { | ||
| case url(URL, orientation: UInt32?) | ||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| case image(CGImage, orientation: CGImagePropertyOrientation?) | ||
| #endif | ||
| } | ||
|
|
||
| let source: Source | ||
|
|
||
| public static func == (lhs: Self, rhs: Self) -> Bool { | ||
| switch (lhs.source, rhs.source) { | ||
| case (.url(let a, let ao), .url(let b, let bo)): | ||
| return a == b && ao == bo | ||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| case (.image(let a, let ao), .image(let b, let bo)): | ||
| return a === b && ao == bo | ||
| #endif | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| func makeSegment(id: String) throws -> Transcript.ImageSegment { | ||
| switch source { | ||
| case .url(let url, let orientation): | ||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| if let orientation { | ||
| guard let source = CGImageSourceCreateWithURL(url as CFURL, nil), | ||
| let image = CGImageSourceCreateImageAtIndex(source, 0, nil) | ||
| else { | ||
| throw Transcript.ImageEncodingError.imageConversionFailed | ||
| } | ||
| return try Self( | ||
| source: .image( | ||
| image, | ||
| orientation: CGImagePropertyOrientation(rawValue: orientation) | ||
| ) | ||
| ).makeSegment(id: id) | ||
| } | ||
| #endif | ||
| return .init(id: id, url: url) | ||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| case .image(let image, let orientation): | ||
| let bytes = NSMutableData() | ||
| guard | ||
| let destination = CGImageDestinationCreateWithData( | ||
| bytes, | ||
| "public.png" as CFString, | ||
| 1, | ||
| nil | ||
| ) | ||
| else { | ||
| throw Transcript.ImageEncodingError.imageConversionFailed | ||
| } | ||
| var properties: [CFString: Any] = [:] | ||
| if let orientation { | ||
| properties[kCGImagePropertyOrientation] = orientation.rawValue | ||
| } | ||
| CGImageDestinationAddImage(destination, image, properties as CFDictionary) | ||
| guard CGImageDestinationFinalize(destination) else { | ||
| throw Transcript.ImageEncodingError.imageConversionFailed | ||
| } | ||
| return .init(id: id, data: bytes as Data, mimeType: "image/png") | ||
| #endif | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension Attachment where Content == ImageAttachmentContent { | ||
| #if canImport(CoreGraphics) && canImport(ImageIO) | ||
| public init(_ image: CGImage, orientation: CGImagePropertyOrientation? = nil) { | ||
| content = .init(source: .image(image, orientation: orientation)) | ||
| } | ||
|
|
||
| public init(imageURL: URL, orientation: CGImagePropertyOrientation? = nil) { | ||
| // Preserve the URL itself; its bytes are not read merely by constructing a prompt. | ||
| content = .init(source: .url(imageURL, orientation: orientation?.rawValue)) | ||
| } | ||
| #else | ||
| public init(imageURL: URL) { | ||
| content = .init(source: .url(imageURL, orientation: nil)) | ||
| } | ||
| #endif | ||
| } | ||
|
|
||
| extension Attachment: PromptRepresentable where Content == ImageAttachmentContent { | ||
| public var promptRepresentation: Prompt { | ||
| Prompt(components: [.image(id: UUID().uuidString, content: content)]) | ||
| } | ||
| } | ||
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