Type Method


Returns the number of GPUs not currently driving a display.


+ (unsigned int)offlineGPUCount;

Return Value

The number of offline GPU devices.


If this count is greater than zero, the system has attached GPU devices that are not currently driving a display. You can use these devices for Core Image rendering by creating a context with the contextForOfflineGPUAtIndex: orcontextForOfflineGPUAtIndex:colorSpace:options:sharedContext: method.

See Also

Managing Resources

- clearCaches

Frees any cached data, such as temporary images, associated with the context and runs the garbage collector.

- reclaimResources

Runs the garbage collector to reclaim any resources that the context no longer requires.


The working color space of the Core Image context.


The working pixel format of the Core Image context.