Initializer

init(dataInfo:data:size:releaseData:)

Creates a direct-access data provider that uses data your program supplies.

Declaration

init?(dataInfo info: UnsafeMutableRawPointer?, data: UnsafeRawPointer, size: Int, releaseData: CGDataProviderReleaseDataCallback)

Parameters

info

A pointer to data of any type, or NULL. When Core Graphics calls the function specified in the releaseData parameter, it sends this pointer as its first argument.

data

A pointer to the array of data that the provider contains.

size

A value that specifies the number of bytes that the data provider contains.

releaseData

A pointer to a release callback for the data provider, or NULL. Your release function is called when Core Graphics frees the data provider. For more information, see CGDataProviderReleaseDataCallback.

Return Value

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

Discussion

You use this function to create a direct-access data provider that uses callback functions to read data from your program an entire block at one time.

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 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:).

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software