pub enum CGImage {}
pub type CGImageRef = *mut CGImage;
pub enum CGColorSpace {}
pub type CGColorSpaceRef = *mut CGColorSpace;
pub enum CGDataProvider {}
pub type CGDataProviderRef = *mut CGDataProvider;
pub enum CGFont {}
pub type CGFontRef = *mut CGFont;
pub enum CGEvent {}
pub type CGEventRef = *mut CGEvent;
pub enum CGEventSource {}
pub type CGEventSourceRef = *mut CGEventSource;
pub enum CGContext {}
pub type CGContextRef = *mut CGContext;
pub enum CGDisplayMode {}
pub type CGDisplayModeRef = *mut CGDisplayMode;