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// To build libwebp
$ brew install libtool
$ brew install automake
$ brew install autoconf
// Create WebP.framework
$ git clone https://chromium.googlesource.com/webm/libwebp
$ git checkout 0.5.1
$ ./iosbuild.sh
-> WebP.framework
Add the WebP Header to your bridging header #include
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private func freeImageData(info: UnsafeMutablePointer, data: UnsafePointer, size: Int) {
free(UnsafeMutablePointer(data))
}
extension UIImage {
static func imageFromWebPData(data: NSData) -> UIImage? {
var config = WebPDecoderConfig()
if WebPInitDecoderConfig(&config) == 0 {
return nil
}
if WebPGetFeatures(UnsafePointer(data.bytes), data.length, &config.input) != VP8_STATUS_OK {
return nil
}
config.output.colorspace = config.input.has_alpha != 0 ? MODE_rgbA : MODE_RGB
if WebPDecode(UnsafePointer(data.bytes), data.length, &config) != VP8_STATUS_OK {
return nil
}
let width = config.input.width
let height = config.input.height
let provider = CGDataProviderCreateWithData(nil, config.output.u.RGBA.rgba, config.output.u.RGBA.size, freeImageData)
let colorSpaceRef = CGColorSpaceCreateDeviceRGB()
let components = config.input.has_alpha != 0 ? 4 : 3
let bi = config.input.has_alpha != 0 ?
CGBitmapInfo(rawValue: CGBitmapInfo.ByteOrderDefault.rawValue | CGImageAlphaInfo.PremultipliedLast.rawValue) : CGBitmapInfo.ByteOrderMask
guard let imageRef = CGImageCreate(
Int(width), Int(height), 8, components * 8, components * Int(width),
colorSpaceRef, bi, provider, nil, true, .RenderingIntentDefault) else {
return nil
}
return UIImage(CGImage: imageRef)
}
}
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guard let url = NSURL(string: "path/to/image") else {
return
}
NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
guard let data = data else {
return
}
// Convert NSData to UIImage in Background Threads
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
let image = UIImage.imageFromWebPData(data) ?? UIImage(data: data)
// Handle image
}
}
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