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Add macOS support for BlurHashEncode #258

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Add macOS support for BlurHashEncode #258

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102 changes: 73 additions & 29 deletions Swift/BlurHashEncode.swift
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Original file line number Diff line number Diff line change
@@ -1,34 +1,27 @@
#if os(iOS)
import UIKit
#elseif os(macOS)
import AppKit
#endif

protocol BlurHashEncodable {
var cgImage: CGImage? { get }

func blurHash(numberOfComponents components: (Int, Int)) -> String?
}

extension UIImage {
public func blurHash(numberOfComponents components: (Int, Int)) -> String? {
let pixelWidth = Int(round(size.width * scale))
let pixelHeight = Int(round(size.height * scale))

let context = CGContext(
data: nil,
width: pixelWidth,
height: pixelHeight,
bitsPerComponent: 8,
bytesPerRow: pixelWidth * 4,
space: CGColorSpace(name: CGColorSpace.sRGB)!,
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
)!
context.scaleBy(x: scale, y: -scale)
context.translateBy(x: 0, y: -size.height)

UIGraphicsPushContext(context)
draw(at: .zero)
UIGraphicsPopContext()

guard let cgImage = context.makeImage(),
let dataProvider = cgImage.dataProvider,
let data = dataProvider.data,
let pixels = CFDataGetBytePtr(data) else {
assertionFailure("Unexpected error!")
return nil
}

extension BlurHashEncodable {
func blurHash(numberOfComponents components: (Int, Int)) -> String? {
guard
let cgImage,
let dataProvider = cgImage.dataProvider,
let data = dataProvider.data,
let pixels = CFDataGetBytePtr(data)
else {
assertionFailure("Unexpected error!")
return nil
}

let width = cgImage.width
let height = cgImage.height
let bytesPerRow = cgImage.bytesPerRow
Expand Down Expand Up @@ -94,6 +87,57 @@ extension UIImage {
}
}

#if os(iOS)
extension UIImage: BlurHashEncodable {
var cgImage: CGImage? {
let pixelWidth = Int(round(size.width * scale))
let pixelHeight = Int(round(size.height * scale))

let context = CGContext(
data: nil,
width: pixelWidth,
height: pixelHeight,
bitsPerComponent: 8,
bytesPerRow: pixelWidth * 4,
space: CGColorSpace(name: CGColorSpace.sRGB)!,
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
)!
context.scaleBy(x: scale, y: -scale)
context.translateBy(x: 0, y: -size.height)

UIGraphicsPushContext(context)
draw(at: .zero)
UIGraphicsPopContext()
return context.makeImage()
}
}

#elseif os(macOS)
extension NSImage: BlurHashEncodable {
var cgImage: CGImage? {
let pixelWidth = Int(round(size.width))
let pixelHeight = Int(round(size.height))

let context = CGContext(
data: nil,
width: pixelWidth,
height: pixelHeight,
bitsPerComponent: 8,
bytesPerRow: pixelWidth * 4,
space: CGColorSpace(name: CGColorSpace.sRGB)!,
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
)!

let graphicsContext = NSGraphicsContext(cgContext: context, flipped: true)
NSGraphicsContext.saveGraphicsState()
NSGraphicsContext.current = graphicsContext
draw(at: .zero, from: NSRect(x: 0, y: 0, width: pixelWidth, height: pixelHeight), operation: .sourceOver, fraction: 1.0)
NSGraphicsContext.restoreGraphicsState()
return context.makeImage()
}
}
#endif

private func encodeDC(_ value: (Float, Float, Float)) -> Int {
let roundedR = linearTosRGB(value.0)
let roundedG = linearTosRGB(value.1)
Expand Down