imageutil

Documentation

Index

• Variables
• func BGRASize(r *image.Rectangle) int
• func BgraColor(c color.Color) color.RGBA
• func BorderRectangle(img draw.Image, r image.Rectangle, c color.Color, size int)
• func ColorUint16s(c color.Color) (uint16, uint16, uint16, uint16)
• func Complement(c color.RGBA) color.RGBA
• func DrawCopy(dst draw.Image, r image.Rectangle, src image.Image)
• func DrawMask(dst draw.Image, r image.Rectangle, src image.Image, srcp image.Point, ...)
• func DrawUniform(dst draw.Image, r image.Rectangle, c color.Color, op draw.Op)
• func DrawUniformMask(dst draw.Image, r image.Rectangle, c color.Color, mask image.Image, ...)
• func FillRectangle(img draw.Image, r image.Rectangle, c color.Color)
• func Invert(c color.RGBA) color.RGBA
• func Invert2(c color.RGBA) color.RGBA
• func IsLighter(c color.Color) bool
• func MaxPoint(p1, p2 image.Point) image.Point
• func MinPoint(p1, p2 image.Point) image.Point
• func NewLinearInvertFn(v1, v2 float64) func(color.RGBA) color.RGBA
• func NewLinearInvertFn2(v1, v2 float64) func(color.Color) color.Color
• func PaintShadow(img draw.Image, r image.Rectangle, height int, maxColorDiff float64)
• func RgbaColor(c color.Color) color.RGBA
• func RgbaFromInt(u int) color.RGBA
• func RgbaToInt(c color.RGBA) int
• func Shade(c color.Color, v float64) color.Color
• func SprintRgb(c color.Color) string
• func SprintRgbaHex(c color.Color) string
• func Tint(c color.Color, v float64) color.Color
• func TintOrShade(c color.Color, v float64) color.Color
• func Valorize(c color.Color, v float64, auto bool) color.Color
• type BGRA
  • func NewBGRA(r *image.Rectangle) *BGRA
  • func NewBGRAFromBuffer(buf []byte, r *image.Rectangle) *BGRA
  • func (img *BGRA) At(x, y int) color.Color
  • func (img *BGRA) ColorModel() color.Model
  • func (img *BGRA) Set(x, y int, c color.Color)
  • func (img *BGRA) SetRGBA(x, y int, c color.RGBA)
  • func (img *BGRA) SubImage(r image.Rectangle) draw.Image
• type GammaTable
  • func NewGammaTable(gamma float64) *GammaTable
  • func (g *GammaTable) Lookup(c color.RGBA) color.RGBA
• type HSV
  • func MakeHSV(h uint16, s, v uint8) HSV
  • func (c HSV) RGBA() (_, _, _, _ uint32)

Variables

var HSVModel color.Model = color.ModelFunc(convertToHSV)

Functions

func BGRASize

func BGRASize(r *image.Rectangle) int

func BgraColor

func BgraColor(c color.Color) color.RGBA

func BorderRectangle

func BorderRectangle(img draw.Image, r image.Rectangle, c color.Color, size int)

func ColorUint16s

func ColorUint16s(c color.Color) (uint16, uint16, uint16, uint16)

Ex. usage: editor.xutil.cursors

func Complement

func Complement(c color.RGBA) color.RGBA

func DrawCopy

func DrawCopy(dst draw.Image, r image.Rectangle, src image.Image)

func DrawMask

func DrawMask(
	dst draw.Image,
	r image.Rectangle,
	src image.Image, srcp image.Point,
	mask image.Image, maskp image.Point,
	op draw.Op,
)

func DrawUniform

func DrawUniform(dst draw.Image, r image.Rectangle, c color.Color, op draw.Op)

func DrawUniformMask

func DrawUniformMask(
	dst draw.Image,
	r image.Rectangle,
	c color.Color,
	mask image.Image, maskp image.Point,
	op draw.Op,
)

func FillRectangle

func FillRectangle(img draw.Image, r image.Rectangle, c color.Color)

func Invert

func Invert(c color.RGBA) color.RGBA

func Invert2

func Invert2(c color.RGBA) color.RGBA

func IsLighter

func IsLighter(c color.Color) bool

func MaxPoint

func MaxPoint(p1, p2 image.Point) image.Point

func MinPoint

func MinPoint(p1, p2 image.Point) image.Point

func NewLinearInvertFn

func NewLinearInvertFn(v1, v2 float64) func(color.RGBA) color.RGBA

NOTE: https://www.pyimagesearch.com/2015/10/05/opencv-gamma-correction/

func NewLinearInvertFn2

func NewLinearInvertFn2(v1, v2 float64) func(color.Color) color.Color

func PaintShadow

func PaintShadow(img draw.Image, r image.Rectangle, height int, maxColorDiff float64)

maxColorDiff in [0.0, 1.0]

func RgbaColor

func RgbaColor(c color.Color) color.RGBA

func RgbaFromInt

func RgbaFromInt(u int) color.RGBA

func RgbaToInt

func RgbaToInt(c color.RGBA) int

func Shade

func Shade(c color.Color, v float64) color.Color

Turn color darker by v percent (0.0, 1.0).

func SprintRgb

func SprintRgb(c color.Color) string

func SprintRgbaHex

func SprintRgbaHex(c color.Color) string

func Tint

func Tint(c color.Color, v float64) color.Color

Turn color lighter by v percent (0.0, 1.0).

func TintOrShade

func TintOrShade(c color.Color, v float64) color.Color

func Valorize

func Valorize(c color.Color, v float64, auto bool) color.Color

Types

type BGRA

type BGRA struct {
	image.RGBA
}

func NewBGRA

func NewBGRA(r *image.Rectangle) *BGRA

func NewBGRAFromBuffer

func NewBGRAFromBuffer(buf []byte, r *image.Rectangle) *BGRA

func (*BGRA) At

func (img *BGRA) At(x, y int) color.Color

func (*BGRA) ColorModel

func (img *BGRA) ColorModel() color.Model

func (*BGRA) Set

func (img *BGRA) Set(x, y int, c color.Color)

func (*BGRA) SetRGBA

func (img *BGRA) SetRGBA(x, y int, c color.RGBA)

Allows fast lane if detected.

func (*BGRA) SubImage

func (img *BGRA) SubImage(r image.Rectangle) draw.Image

type GammaTable

type GammaTable struct {
	Table [256]uint8
}

func NewGammaTable

func NewGammaTable(gamma float64) *GammaTable

func (*GammaTable) Lookup

func (g *GammaTable) Lookup(c color.RGBA) color.RGBA

type HSV

type HSV struct {
	H    uint16 // [0-360)
	S, V uint8  // [0-255]
}

func MakeHSV

func MakeHSV(h uint16, s, v uint8) HSV

h in [0-360), {s,v} in [0-100]

func (HSV) RGBA

func (c HSV) RGBA() (_, _, _, _ uint32)