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31 lines
960 B
Swift
31 lines
960 B
Swift
//
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// CIImage+Split.swift
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// MyTransparentVideoExample
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//
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// Created by Quentin Fasquel on 27/03/2020.
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// Copyright © 2020 Quentin Fasquel. All rights reserved.
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//
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import CoreImage
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extension CIImage {
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typealias VerticalSplit = (topImage: CIImage, bottomImage: CIImage)
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func verticalSplit() -> VerticalSplit {
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let outputExtent = self.extent.applying(CGAffineTransform(scaleX: 1.0, y: 0.5))
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// Get the top region according to Core Image coordinate system, (0,0) being bottom left
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let translate = CGAffineTransform(translationX: 0, y: outputExtent.height)
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let topRegion = outputExtent.applying(translate)
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var topImage = self.cropped(to: topRegion)
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// Translate topImage back to origin
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topImage = topImage.transformed(by: translate.inverted())
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let bottomRegion = outputExtent
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let bottomImage = self.cropped(to: bottomRegion)
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return (topImage, bottomImage)
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}
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}
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