Global Variable

kCGDisplayStreamDestinationRect

This key specifies that the display stream outputs the frame data into a subset of the output IOSurface object. If this key is not included in the dictionary, then the entire output surface is used. The value must be created using the CGRectCreateDictionaryRepresentation function. The rectangle is specified in pixels in the surface’s coordinate system

Declaration

const CFStringRef kCGDisplayStreamDestinationRect;