Contents

CGDataProviderRewindCallback

A callback function that moves the current position in the data stream back to the beginning.

Declaration

typealias CGDataProviderRewindCallback = (UnsafeMutableRawPointer?) -> Void

Parameters

info:
A generic pointer to private data shared among your callback functions. This is the same pointer you supplied to Init(version:getbytes:skipforward:rewind:releaseinfo:).

Discussion

When Core Graphics needs to read from the beginning of the provider’s data stream, your function is called.

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

See Also

Creating Sequential-Access Data Providers