A bitmap image or image mask.
SDKs
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
Framework
- Core Graphics
Declaration
class CGImage
Class
CGImage
Topics
Creating Images
init?(width: Int, height: Int, bitsCreates a bitmap image from data supplied by a data provider.
init?(jpegCreates a bitmap image using JPEG-encoded data supplied by a data provider.
init?(pngCreates a bitmap image using PNG-encoded data supplied by a data provider.
Examining an Image
var isReturns whether a bitmap image is an image mask.
var width: IntReturns the width of a bitmap image.
var height: IntReturns the height of a bitmap image.
var bitsReturns the number of bits allocated for a single color component of a bitmap image.
var bitsReturns the number of bits allocated for a single pixel in a bitmap image.
var bytesReturns the number of bytes allocated for a single row of a bitmap image.
var colorReturn the color space for a bitmap image.
var alphaReturns the alpha channel information for a bitmap image.
enum CGImageStorage options for alpha component data.
var dataReturns the data provider for a bitmap image.
var decode: UnsafeReturns the decode array for a bitmap image.
var shouldReturns the interpolation setting for a bitmap image.
var renderingReturns the rendering intent setting for a bitmap image.
var bitmapReturns the bitmap information for a bitmap image.
struct CGBitmapComponent information for a bitmap image.
var utThe Universal Type Identifier for the image.
Copying an Image
func copy() -> CGImage?Creates a copy of a bitmap image.
func copy(colorCreates a copy of a bitmap image, replacing its colorspace.
Creating Images by Modifying an Image
func cropping(to: CGRect) -> CGImage?Creates a bitmap image using the data contained within a subregion of an existing bitmap image.
func masking(CGImage) -> CGImage?Creates a bitmap image from an existing image and an image mask.
func copy(maskingCreates a bitmap image by masking an existing bitmap image with the provided color values.
Creating Image Masks
init?(maskCreates a bitmap image mask from data supplied by a data provider.
Working with Core Foundation Types
class var typeReturns the type identifier for CGImage objects.
Initializers
init?(windowReturns a composite image of the specified windows.
See Also
2D Drawing
class CGContextA Quartz 2D drawing environment.
class CGPathAn immutable graphics path: a mathematical description of shapes or lines to be drawn in a graphics context.
class CGMutableA mutable graphics path: a mathematical description of shapes or lines to be drawn in a graphics context.
class CGLayerAn offscreen context for reusing content drawn with Core Graphics.
Beta Software
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