Class

CGImage

A bitmap image or image mask.

Declaration

class CGImage

Topics

Creating Images

init?(width: Int, height: Int, bitsPerComponent: Int, bitsPerPixel: Int, bytesPerRow: Int, space: CGColorSpace, bitmapInfo: CGBitmapInfo, provider: CGDataProvider, decode: UnsafePointer<CGFloat>?, shouldInterpolate: Bool, intent: CGColorRenderingIntent)

Creates a bitmap image from data supplied by a data provider.

init?(jpegDataProviderSource: CGDataProvider, decode: UnsafePointer<CGFloat>?, shouldInterpolate: Bool, intent: CGColorRenderingIntent)

Creates a bitmap image using JPEG-encoded data supplied by a data provider.

init?(pngDataProviderSource: CGDataProvider, decode: UnsafePointer<CGFloat>?, shouldInterpolate: Bool, intent: CGColorRenderingIntent)

Creates a bitmap image using PNG-encoded data supplied by a data provider.

Examining an Image

var isMask: Bool

Returns whether a bitmap image is an image mask.

var width: Int

Returns the width of a bitmap image.

var height: Int

Returns the height of a bitmap image.

var bitsPerComponent: Int

Returns the number of bits allocated for a single color component of a bitmap image.

var bitsPerPixel: Int

Returns the number of bits allocated for a single pixel in a bitmap image.

var bytesPerRow: Int

Returns the number of bytes allocated for a single row of a bitmap image.

var colorSpace: CGColorSpace?

Return the color space for a bitmap image.

var alphaInfo: CGImageAlphaInfo

Returns the alpha channel information for a bitmap image.

enum CGImageAlphaInfo

Storage options for alpha component data.

var dataProvider: CGDataProvider?

Returns the data provider for a bitmap image.

var decode: UnsafePointer<CGFloat>?

Returns the decode array for a bitmap image.

var shouldInterpolate: Bool

Returns the interpolation setting for a bitmap image.

var renderingIntent: CGColorRenderingIntent

Returns the rendering intent setting for a bitmap image.

var bitmapInfo: CGBitmapInfo

Returns the bitmap information for a bitmap image.

struct CGBitmapInfo

Component information for a bitmap image.

var utType: CFString?

The Universal Type Identifier for the image.

Copying an Image

func copy() -> CGImage?

Creates a copy of a bitmap image.

func copy(colorSpace: CGColorSpace) -> CGImage?

Creates 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(maskingColorComponents: [CGFloat]) -> CGImage?

Creates a bitmap image by masking an existing bitmap image with the provided color values.

Creating Image Masks

init?(maskWidth: Int, height: Int, bitsPerComponent: Int, bitsPerPixel: Int, bytesPerRow: Int, provider: CGDataProvider, decode: UnsafePointer<CGFloat>?, shouldInterpolate: Bool)