CG_EXTERN CGColorRef __nullable CGColorCreate(CGColorSpaceRef cg_nullable space,
  const CGFloat * cg_nullable components)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGColorRef  CGColorCreateGenericGray(CGFloat gray, CGFloat alpha)
  CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);

CG_EXTERN CGColorRef  CGColorCreateGenericRGB(CGFloat red, CGFloat green,
  CGFloat blue, CGFloat alpha) CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);

CG_EXTERN CGColorRef  CGColorCreateGenericCMYK(CGFloat cyan, CGFloat magenta,
  CGFloat yellow, CGFloat black, CGFloat alpha)
  CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);


CG_EXTERN CGColorRef __nullable CGColorGetConstantColor(CFStringRef cg_nullable colorName)
  CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);

CG_EXTERN CGColorRef __nullable CGColorCreateWithPattern(CGColorSpaceRef cg_nullable space,
  CGPatternRef cg_nullable pattern, const CGFloat * cg_nullable components)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGColorRef __nullable CGColorCreateCopy(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGColorRef __nullable CGColorCreateCopyWithAlpha(CGColorRef cg_nullable color,
  CGFloat alpha) CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGColorRef __nullable CGColorCreateCopyByMatchingToColorSpace(cg_nullable CGColorSpaceRef,
  CGColorRenderingIntent intent, CGColorRef cg_nullable color, __nullable CFDictionaryRef options)
  CG_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0);

CG_EXTERN CGColorRef cg_nullable CGColorRetain(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN void CGColorRelease(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN bool CGColorEqualToColor(CGColorRef cg_nullable color1, CGColorRef cg_nullable color2)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN size_t CGColorGetNumberOfComponents(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN const CGFloat * __nullable CGColorGetComponents(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGFloat CGColorGetAlpha(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGColorSpaceRef __nullable CGColorGetColorSpace(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CGPatternRef __nullable CGColorGetPattern(CGColorRef cg_nullable color)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);

CG_EXTERN CFTypeID CGColorGetTypeID(void)
  CG_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_2_0);