Type Alias

CGDataProviderRewindCallback

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

Declaration

typedef void (*CGDataProviderRewindCallback)(void *info);

Parameters

info

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

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 CGDataProviderCreate and CGDataProviderCallbacks.

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.

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.

CGDataProviderReleaseBytePointerCallback

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

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.