A bitmap image or image mask.
SDKs
- iOS 2.0+
- macOS 10.0+
- UIKit for Mac 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
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.
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