Santo ShakilandCodex
a3a52a43ca
(cherry picked from commit ca25e8becc4bfb18d63ca7920d26a984eae0e16f)
34 lines
1.4 KiB
Swift
34 lines
1.4 KiB
Swift
import Accelerate
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import Foundation
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enum ImageProcessing {
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static let queue = {
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let q = OperationQueue()
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q.name = "thumbnail.processing"
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q.qualityOfService = .userInitiated
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q.maxConcurrentOperationCount = ProcessInfo.processInfo.activeProcessorCount * 2
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return q
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}()
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static let cancelledResult = Result<[String: Int64]?, any Error>.success(nil)
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// Impeller shrinks each side to the GPU texture limit on its own, which squishes long images.
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static let maxPixelSize = 16384
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static func rgbaBuffer(_ image: CGImage, format: vImage_CGImageFormat) throws -> vImage_Buffer {
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guard image.bitsPerComponent == 10 else {
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return try vImage_Buffer(cgImage: image, format: format)
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}
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// vImage can't convert packed 10-bit images.
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let buffer = try vImage_Buffer(width: image.width, height: image.height, bitsPerPixel: format.bitsPerPixel)
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guard let context = CGContext(data: buffer.data, width: image.width, height: image.height, bitsPerComponent: Int(format.bitsPerComponent), bytesPerRow: buffer.rowBytes, space: format.colorSpace.takeUnretainedValue(), bitmapInfo: format.bitmapInfo.rawValue) else {
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buffer.free()
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throw vImage.Error.invalidImageFormat
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}
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context.setRenderingIntent(format.renderingIntent)
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context.setBlendMode(.copy)
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context.draw(image, in: CGRect(x: 0, y: 0, width: image.width, height: image.height))
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return buffer
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}
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}
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