Initializer

init(data:)

Creates a data provider that reads from a CFData object.

Declaration

init?(data: CFData)

Parameters

data

The CFData object to read from.

Return Value

A new data provider. You are responsible for releasing this object using CGDataProviderRelease.

Discussion

You can use this function when you need to represent Core Graphics data as a CFData type. For example, you might create a CFData object when reading data from the pasteboard.

See Also

Creating Direct-Access Data Providers

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 CGDataProviderReleaseInfoCallback

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

typealias CGDataProviderReleaseDataCallback

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