mirror of
https://github.com/twonlyapp/twonly-app.git
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38 lines
1.4 KiB
Swift
38 lines
1.4 KiB
Swift
import Foundation
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import ImageIO
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import UniformTypeIdentifiers
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/// C ABI called directly by Rust for the container formats Rust has no decoder
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/// for — HEIC/HEIF from the camera above all. ImageIO decodes every format the
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/// OS knows; Rust re-encodes the result to WebP itself. Flutter is not involved.
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@_cdecl("twonly_decode_image_to_png")
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func twonlyDecodeImageToPng(
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_ input: UnsafePointer<CChar>?,
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_ output: UnsafePointer<CChar>?
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) -> Bool {
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guard let input, let output else { return false }
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let inputURL = URL(fileURLWithPath: String(cString: input))
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let outputURL = URL(fileURLWithPath: String(cString: output))
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guard
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let source = CGImageSourceCreateWithURL(inputURL as CFURL, nil),
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let image = CGImageSourceCreateImageAtIndex(source, 0, nil)
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else { return false }
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try? FileManager.default.createDirectory(
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at: outputURL.deletingLastPathComponent(),
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withIntermediateDirectories: true
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)
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// PNG is lossless, so the quality decision stays with Rust's WebP encode.
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let type: CFString
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if #available(iOS 14.0, *) {
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type = UTType.png.identifier as CFString
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} else {
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type = "public.png" as CFString
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}
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guard
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let destination = CGImageDestinationCreateWithURL(outputURL as CFURL, type, 1, nil)
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else { return false }
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CGImageDestinationAddImage(destination, image, nil)
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return CGImageDestinationFinalize(destination)
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}
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