img

package

v0.0.0-...-2ef904a Latest Latest Go to latest Published: Mar 29, 2016 License: GPL-3.0 Imports: 13 Imported by: 0

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Package img provides image conversion functions.

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var Threads int

func Decode(r io.Reader, mode ImageConvert) ([]uint8, image.Rectangle, error)

Get an image pixels in NRGBA format

func Ungamma(x float64) float64

Convert from SRGB to linear color

type BlurFilter struct {
	Radius float64
	Clamp  bool
}

Apply Gaussian blur to the image

func (f BlurFilter) Draw(dst draw.Image, r image.Rectangle, src image.Image, sp image.Point)

type ColorFilter func(float64) float64

Apply filter to RGB color of each pixel

func (f ColorFilter) Draw(dst draw.Image, r image.Rectangle, src image.Image, sp image.Point)

type Converter struct {
	// contains filtered or unexported fields
}

Apply a series of image compositing functions

func NewConverter() *Converter

func (c *Converter) Add(filter ...draw.Drawer)

func (c *Converter) Apply(src image.Image) *image.NRGBA

type ImageConvert int

const (
	NoConvert ImageConvert = iota
	SRGBToLinear
	BumpToNormal
)

type SobelFilter struct {
	Strength float64
	Clamp    bool
}

Apply sobel filter and convert x offset to red channel and y offset to green channel

func (f SobelFilter) Draw(dst draw.Image, r image.Rectangle, src image.Image, sp image.Point)