Structure

GraphicsContext.BlendMode

The ways that a graphics context combines new content with background content.

Declaration 宣言

@frozen struct BlendMode

Overview 概要

Use one of these values to set the blendMode property of a GraphicsContext. The value that you set affects how content that you draw replaces or combines with content that you previously drew into the context.

Topics 話題

Getting the Default

static var normal: GraphicsContext.BlendMode

A mode that paints source image samples over the background image samples.

Darkening

static var darken: GraphicsContext.BlendMode

A mode that creates composite image samples by choosing the darker samples from either the source image or the background.

static var multiply: GraphicsContext.BlendMode

A mode that multiplies the source image samples with the background image samples.

static var colorBurn: GraphicsContext.BlendMode

A mode that darkens background image samples to reflect the source image samples.

static var plusDarker: GraphicsContext.BlendMode

A mode that adds the inverse of the color components of the source and background images, and then inverts the result, producing a darkened composite.

Lightening

static var lighten: GraphicsContext.BlendMode

A mode that creates composite image samples by choosing the lighter samples from either the source image or the background.

static var screen: GraphicsContext.BlendMode

A mode that multiplies the inverse of the source image samples with the inverse of the background image samples.

static var colorDodge: GraphicsContext.BlendMode

A mode that brightens the background image samples to reflect the source image samples.

static var plusLighter: GraphicsContext.BlendMode

A mode that adds the components of the source and background images, resulting in a lightened composite.

Adding Contrast

static var overlay: GraphicsContext.BlendMode

A mode that either multiplies or screens the source image samples with the background image samples, depending on the background color.

static var softLight: GraphicsContext.BlendMode

A mode that either darkens or lightens colors, depending on the source image sample color.

static var hardLight: GraphicsContext.BlendMode

A mode that either multiplies or screens colors, depending on the source image sample color.

Inverting

static var difference: GraphicsContext.BlendMode

A mode that subtracts the brighter of the source image sample color or the background image sample color from the other.

static var exclusion: GraphicsContext.BlendMode

A mode that produces an effect similar to that produced by the difference blend mode, but with lower contrast.

Mixing Color Components

static var hue: GraphicsContext.BlendMode

A mode that uses the luminance and saturation values of the background with the hue of the source image.

static var saturation: GraphicsContext.BlendMode

A mode that uses the luminance and hue values of the background with the saturation of the source image.

static var color: GraphicsContext.BlendMode

A mode that uses the luminance values of the background with the hue and saturation values of the source image.

static var luminosity: GraphicsContext.BlendMode

A mode that uses the hue and saturation of the background with the luminance of the source image.

Accessing Porter-Duff Modes

static var clear: GraphicsContext.BlendMode

A mode that clears any pixels that the source image overwrites.

static var copy: GraphicsContext.BlendMode

A mode that replaces background image samples with source image samples.

static var sourceIn: GraphicsContext.BlendMode

A mode that you use to paint the source image, including its transparency, onto the opaque parts of the background.

static var sourceOut: GraphicsContext.BlendMode

A mode that you use to paint the source image onto the transparent parts of the background, while erasing the background.

static var sourceAtop: GraphicsContext.BlendMode

A mode that you use to paint the opaque parts of the source image onto the opaque parts of the background.

static var destinationOver: GraphicsContext.BlendMode

A mode that you use to paint the source image under the background.

static var destinationIn: GraphicsContext.BlendMode

A mode that you use to erase any of the background that isn’t covered by opaque source pixels.

static var destinationOut: GraphicsContext.BlendMode

A mode that you use to erase any of the background that is covered by opaque source pixels.

static var destinationAtop: GraphicsContext.BlendMode

A mode that you use to paint the source image under the background, while erasing any of the background not matched by opaque pixels from the source image.