package f32color

import "gioui.org/internal/f32color"

Index ¶

• func Disabled(c color.NRGBA) (d color.NRGBA)
• func Hovered(c color.NRGBA) (h color.NRGBA)
• func MulAlpha(c color.NRGBA, alpha uint8) color.NRGBA
• func NRGBAToLinearRGBA(col color.NRGBA) color.RGBA
• func NRGBAToRGBA(col color.NRGBA) color.RGBA
• func RGBAToNRGBA(col color.RGBA) color.NRGBA
• type RGBA
• func LinearFromSRGB(col color.NRGBA) RGBA
• func (rgba RGBA) Array() [4]float32
• func (col RGBA) Float32() (r, g, b, a float32)
• func (col RGBA) Luminance() float32
• func (col RGBA) Opaque() RGBA
• func (col RGBA) SRGB() color.NRGBA

Functions ¶

func Disabled ¶

func Disabled(c color.NRGBA) (d color.NRGBA)

Disabled blends color towards the luminance and multiplies alpha. Blending towards luminance will desaturate the color. Multiplying alpha blends the color together more with the background.

func Hovered ¶

func Hovered(c color.NRGBA) (h color.NRGBA)

Hovered blends dark colors towards white, and light colors towards black. It is approximate because it operates in non-linear sRGB space.

func MulAlpha ¶

func MulAlpha(c color.NRGBA, alpha uint8) color.NRGBA

MulAlpha applies the alpha to the color.

func NRGBAToLinearRGBA ¶

func NRGBAToLinearRGBA(col color.NRGBA) color.RGBA

NRGBAToLinearRGBA converts from non-premultiplied sRGB color to premultiplied linear RGBA color.

Each component in the result is `c * alpha`, where `c` is the linear color.

func NRGBAToRGBA ¶

func NRGBAToRGBA(col color.NRGBA) color.RGBA

NRGBAToRGBA converts from non-premultiplied sRGB color to premultiplied sRGB color.

Each component in the result is `sRGBToLinear(c * alpha)`, where `c` is the linear color.

func RGBAToNRGBA ¶

func RGBAToNRGBA(col color.RGBA) color.NRGBA

RGBAToNRGBA converts from premultiplied sRGB color to non-premultiplied sRGB color.

Types ¶

type RGBA ¶

type RGBA struct {
	R, G, B, A float32
}

RGBA is a 32 bit floating point linear premultiplied color space.

func LinearFromSRGB ¶

func LinearFromSRGB(col color.NRGBA) RGBA

LinearFromSRGB converts from col in the sRGB colorspace to RGBA.

func (RGBA) Array ¶

func (rgba RGBA) Array() [4]float32

Array returns rgba values in a [4]float32 array.

func (RGBA) Float32 ¶

func (col RGBA) Float32() (r, g, b, a float32)

Float32 returns r, g, b, a values.

func (RGBA) Luminance ¶

func (col RGBA) Luminance() float32

Luminance calculates the relative luminance of a linear RGBA color. Normalized to 0 for black and 1 for white.

See https://www.w3.org/TR/WCAG20/#relativeluminancedef for more details

func (RGBA) Opaque ¶

func (col RGBA) Opaque() RGBA

Opaque returns the color without alpha component.

func (RGBA) SRGB ¶

func (col RGBA) SRGB() color.NRGBA

SRGBA converts from linear to sRGB color space.

Source Files ¶

rgba.go tables.go

Directories ¶