CGContextDrawImage error, how to allocate the buffer? - ios

Question

I am trying to store image data in buffer in my app so i will be able to use it however I get EXC_BAD_ACCESS error on CGContextDrawImage line.
Here is the code i am using:
resizedImage.Array() // resizedImage - resized image of 280x140 pixels size
func Array() {
let dataBuffer = UnsafeMutablePointer<CUnsignedChar>.alloc(156800) //alloc(156800)
memset(dataBuffer, 0, 156800)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.ByteOrder32Big.rawValue | CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(dataBuffer, 280, 140, 8, 156800, colorSpace, bitmapInfo.rawValue)
let imageRef = CGImageCreateWithImageInRect(CGImage, CGRectMake(0, 0, 280, 140))
let rectMake = CGRectMake(0, 0, 280, 140)
CGContextDrawImage(context, rectMake, imageRef)
return
}
When trying to set buffer and bytes as null and 0 as in apple documentation for automatic memory allocation app doesn't crash, but it gives this errors:
Sep 17 17:18:33 VideoTester[4846] <Error>: CGBitmapContextCreate: invalid data bytes/row: should be at least 1120 for 8 integer bits/component, 3 components, kCGImageAlphaPremultipliedLast.
Sep 17 17:18:33 VideoTester[4846] <Error>: CGContextDrawImage: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Seems like I am missing something but can't really figure it out, any advice is needed, thank you!

Answer 1

Got this working with a help of peacer212, everything seems to work as needed without any errors, here is a working code:
var dataBuffer = [UInt8](count: 280*140 * 4, repeatedValue: 0)
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGBitmapInfo.ByteOrder32Big.rawValue | CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(&dataBuffer, 280, 140, 8, 1120, colorSpace, bitmapInfo.rawValue)
let imageRef = CGImageCreateWithImageInRect(CGImage, CGRectMake(0, 0, 280, 140))
let rectMake = CGRectMake(0, 0, 280, 140)
CGContextDrawImage(context, rectMake, imageRef)