BrokenGIF.swift

import Foundation

let pixels: [[UInt8]] = [
    [
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    ],
    [
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00,
        0x00, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0x00,
        0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    ],
]

let URL = NSURL(fileURLWithPath: "test.gif")
let destination = CGImageDestinationCreateWithURL(URL, kUTTypeGIF, 2, nil)!
for frame in 0 ..< 2 {
    var rgbData = pixels[frame].flatMap { [$0, $0, $0] }
    let data = CGDataProviderCreateWithCFData(NSData(bytes: &rgbData, length: rgbData.count))

    let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.None.rawValue)
    let imageReference = CGImageCreate(8, 8, 8, 8 * 3, 8 * 3,
        CGColorSpaceCreateDeviceRGB(), bitmapInfo, data, nil, false, .RenderingIntentDefault)

    if let imageReference = imageReference {
        CGImageDestinationAddImage(destination, imageReference, nil)
    }
}
CGImageDestinationFinalize(destination)