Type Alias


A callback function that releases any private data or resources associated with the data provider.


typealias CGDataProviderReleaseInfoCallback = (UnsafeMutableRawPointer?) -> Void



A generic pointer to private information shared among your callback functions. This is the same pointer you supplied to CGDataProviderCreate.


When Core Graphics frees a data provider that has an associated release function, the release function is called.

For information on how to associate your callback function with a data provider, see CGDataProviderCreate and CGDataProviderCallbacks.

See Also

Creating Direct-Access Data Providers

init?(data: CFData)

Creates a data provider that reads from a CFData object.

init?(url: CFURL)

Creates a direct-access data provider that uses a URL to supply data.

init?(filename: UnsafePointer<Int8>)

Creates a direct-access data provider that uses a file to supply data.

struct CGDataProviderDirectCallbacks

Defines pointers to client-defined callback functions that manage the sending of data for a direct-access data provider.

typealias CGDataProviderGetBytePointerCallback

A callback function that returns a generic pointer to the provider data.

typealias CGDataProviderGetBytesAtPositionCallback

A callback function that copies data from the provider into a Core Graphics buffer.

typealias CGDataProviderReleaseBytePointerCallback

A callback function that releases the pointer Core Graphics obtained by calling CGDataProviderGetBytePointerCallback.

typealias CGDataProviderReleaseDataCallback

A callback function that releases data you supply to the function init(dataInfo:data:size:releaseData:).