Type Alias

CGDataProviderSkipForwardCallback

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

Declaration

typedef off_t (*CGDataProviderSkipForwardCallback)(void *info, off_t count);

Parameters

info

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

count

The number of bytes to skip.

Return Value

The number of bytes that were actually skipped.

Discussion

When Core Graphics needs to advance forward in the provider’s data stream, your function is called.

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.

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.