Type Alias

CGDataProviderReleaseBytePointerCallback

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

Declaration

typedef void (*CGDataProviderReleaseBytePointerCallback)(void *info, const void *pointer);

Parameters

info

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

pointer

A pointer to your provider data. This is the same pointer you returned in CGDataProviderGetBytePointerCallback.

Discussion

When Core Graphics no longer needs direct access to your provider data, your function is called. You may safely modify, move, or release your provider data at this time.

For information on how to associate your function with a direct-access data provider, see CGDataProviderCreateDirectAccess and CGDataProviderDirectAccessCallbacks.

See Also

Callbacks

CGDataProviderGetBytesCallback

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

CGDataProviderReleaseInfoCallback

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

CGDataProviderRewindCallback

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

CGDataProviderSkipBytesCallback

A callback function that advances the current position in the data stream supplied by the provider.

CGDataProviderSkipForwardCallback

A callback function that advances the current position in the data stream supplied by the provider.

CGDataProviderGetBytePointerCallback

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

CGDataProviderGetBytesAtOffsetCallback

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

CGDataProviderReleaseDataCallback

A callback function that releases data you supply to the function CGDataProviderCreateWithData.

CGDataProviderGetBytesAtPositionCallback

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