From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/go/image%2Fdraw%2Findex.html | 85 ------------------------------------ 1 file changed, 85 deletions(-) delete mode 100644 devdocs/go/image%2Fdraw%2Findex.html (limited to 'devdocs/go/image%2Fdraw%2Findex.html') diff --git a/devdocs/go/image%2Fdraw%2Findex.html b/devdocs/go/image%2Fdraw%2Findex.html deleted file mode 100644 index b44b2f3c9..000000000 --- a/devdocs/go/image%2Fdraw%2Findex.html +++ /dev/null @@ -1,85 +0,0 @@ -

Package draw

Overview

Package draw provides image composition functions.

-

See "The Go image/draw package" for an introduction to this package: https://golang.org/doc/articles/image_draw.html

Index

Examples

Drawer (FloydSteinberg)

Package files

draw.go

func Draw 

func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op)

Draw calls DrawMask with a nil mask.

-

func DrawMask 

func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op)

DrawMask aligns r.Min in dst with sp in src and mp in mask and then replaces the rectangle r in dst with the result of a Porter-Duff composition. A nil mask is treated as opaque.

-

type Drawer 1.2

Drawer contains the Draw method.

-
type Drawer interface {
-    // Draw aligns r.Min in dst with sp in src and then replaces the
-    // rectangle r in dst with the result of drawing src on dst.
-    Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)
-}

FloydSteinberg is a Drawer that is the Src Op with Floyd-Steinberg error diffusion.

-
var FloydSteinberg Drawer = floydSteinberg{}

Example (FloydSteinberg) -

Code:

-const width = 130
-const height = 50
-
-im := image.NewGray(image.Rectangle{Max: image.Point{X: width, Y: height}})
-for x := 0; x < width; x++ {
-    for y := 0; y < height; y++ {
-        dist := math.Sqrt(math.Pow(float64(x-width/2), 2)/3+math.Pow(float64(y-height/2), 2)) / (height / 1.5) * 255
-        var gray uint8
-        if dist > 255 {
-            gray = 255
-        } else {
-            gray = uint8(dist)
-        }
-        im.SetGray(x, y, color.Gray{Y: 255 - gray})
-    }
-}
-pi := image.NewPaletted(im.Bounds(), []color.Color{
-    color.Gray{Y: 255},
-    color.Gray{Y: 160},
-    color.Gray{Y: 70},
-    color.Gray{Y: 35},
-    color.Gray{Y: 0},
-})
-
-draw.FloydSteinberg.Draw(pi, im.Bounds(), im, image.Point{})
-shade := []string{" ", "░", "▒", "▓", "█"}
-for i, p := range pi.Pix {
-    fmt.Print(shade[p])
-    if (i+1)%width == 0 {
-        fmt.Print("\n")
-    }
-}
-

type Image

Image is an image.Image with a Set method to change a single pixel.

-
type Image interface {
-    image.Image
-    Set(x, y int, c color.Color)
-}

type Op

Op is a Porter-Duff compositing operator.

-
type Op int
const (
-    // Over specifies ``(src in mask) over dst''.
-    Over Op = iota
-    // Src specifies ``src in mask''.
-    Src
-)

func (Op) Draw 1.2 

func (op Op) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)

Draw implements the Drawer interface by calling the Draw function with this Op.

-

type Quantizer 1.2

Quantizer produces a palette for an image.

-
type Quantizer interface {
-    // Quantize appends up to cap(p) - len(p) colors to p and returns the
-    // updated palette suitable for converting m to a paletted image.
-    Quantize(p color.Palette, m image.Image) color.Palette
-}

type RGBA64Image 1.17

RGBA64Image extends both the Image and image.RGBA64Image interfaces with a SetRGBA64 method to change a single pixel. SetRGBA64 is equivalent to calling Set, but it can avoid allocations from converting concrete color types to the color.Color interface type.

-
type RGBA64Image interface {
-    image.RGBA64Image
-    Set(x, y int, c color.Color)
-    SetRGBA64(x, y int, c color.RGBA64)
-}
-

- © Google, Inc.
Licensed under the Creative Commons Attribution License 3.0.
- http://golang.org/pkg/image/draw/ -

-
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