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Add SwiftUI and MacOS support to BlurHashDecode #214

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Add SwiftUI and MacOS support to BlurHashDecode #214

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59 changes: 50 additions & 9 deletions Swift/BlurHashDecode.swift
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Original file line number Diff line number Diff line change
@@ -1,21 +1,63 @@
#if canImport(SwiftUI)
import SwiftUI

extension Image {

#if canImport(UIKit)
public init?(blurHash: String, size: CGSize, punch: Float = 1) {
guard let uiImage = UIImage(blurHash: blurHash, size: size, punch: punch) else { return nil }
self.init(uiImage: uiImage)
}
#elseif canImport(AppKit)
public init?(blurHash: String, size: CGSize, punch: Float = 1) {
guard let nsImage = NSImage(blurHash: blurHash, size: size, punch: punch) else { return nil }
self.init(nsImage: nsImage)
}
#endif

}

#endif

#if canImport(UIKit)
import UIKit

extension UIImage {
public convenience init?(blurHash: String, size: CGSize, punch: Float = 1) {

guard let cgImage = CGImage.from(blurHash: blurHash, size: size, punch: punch) else { return nil }

self.init(cgImage: cgImage)
}
}
#elseif canImport(AppKit)
import AppKit

extension NSImage {
public convenience init?(blurHash: String, size: CGSize, punch: Float = 1) {
guard let cgImage = CGImage.from(blurHash: blurHash, size: size, punch: punch) else { return nil }

self.init(cgImage: cgImage, size: .zero)
}
}
#endif

extension CGImage {
static func from(blurHash: String, size: CGSize, punch: Float = 1) -> CGImage? {
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guard blurHash.count >= 6 else { return nil }

let sizeFlag = String(blurHash[0]).decode83()
let numY = (sizeFlag / 9) + 1
let numX = (sizeFlag % 9) + 1
let sizeFlag = String(blurHash[0]).decode83()
let numY = (sizeFlag / 9) + 1
let numX = (sizeFlag % 9) + 1

let quantisedMaximumValue = String(blurHash[1]).decode83()
let quantisedMaximumValue = String(blurHash[1]).decode83()
let maximumValue = Float(quantisedMaximumValue + 1) / 166

guard blurHash.count == 4 + 2 * numX * numY else { return nil }

let colours: [(Float, Float, Float)] = (0 ..< numX * numY).map { i in
if i == 0 {
let value = String(blurHash[2 ..< 6]).decode83()
let value = String(blurHash[2 ..< 6]).decode83()
return decodeDC(value)
} else {
let value = String(blurHash[4 + i * 2 ..< 4 + i * 2 + 2]).decode83()
Expand Down Expand Up @@ -59,10 +101,9 @@ extension UIImage {
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.none.rawValue)

guard let provider = CGDataProvider(data: data) else { return nil }
guard let cgImage = CGImage(width: width, height: height, bitsPerComponent: 8, bitsPerPixel: 24, bytesPerRow: bytesPerRow,
space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: bitmapInfo, provider: provider, decode: nil, shouldInterpolate: true, intent: .defaultIntent) else { return nil }

self.init(cgImage: cgImage)

return CGImage(width: width, height: height, bitsPerComponent: 8, bitsPerPixel: 24, bytesPerRow: bytesPerRow,
space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: bitmapInfo, provider: provider, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
}
}

Expand Down