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57e210b
better builtin avatar generator
wxiaoguang 7553b6b
add more license text
wxiaoguang ce1409c
Merge branch 'main' into refactor-avatar
wxiaoguang ecd71a4
Merge branch 'main' into refactor-avatar
wxiaoguang 19fa794
Merge branch 'main' into refactor-avatar
wxiaoguang c413327
Merge branch 'main' into refactor-avatar
wxiaoguang 27b5823
Update modules/avatar/identicon/identicon.go
wxiaoguang be178dc
Update modules/avatar/identicon/identicon.go
wxiaoguang 45fc6d2
Update modules/avatar/identicon/polygon.go
wxiaoguang f791dbf
Fix by reviews.
wxiaoguang 7e9bfbd
Merge branch 'main' into refactor-avatar
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Original file line number | Diff line number | Diff line change |
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// Copyright 2021 The Gitea Authors. All rights reserved. | ||
// Use of this source code is governed by a MIT-style | ||
// license that can be found in the LICENSE file. | ||
|
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package identicon | ||
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import "image/color" | ||
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// DarkColors are dark colors for avatar blocks, they come from image/color/palette.WebSafe, and light colors (0xff) are removed | ||
var DarkColors = []color.Color{ | ||
color.RGBA{0x00, 0x00, 0x33, 0xff}, | ||
color.RGBA{0x00, 0x00, 0x66, 0xff}, | ||
color.RGBA{0x00, 0x00, 0x99, 0xff}, | ||
color.RGBA{0x00, 0x00, 0xcc, 0xff}, | ||
color.RGBA{0x00, 0x33, 0x00, 0xff}, | ||
color.RGBA{0x00, 0x33, 0x33, 0xff}, | ||
color.RGBA{0x00, 0x33, 0x66, 0xff}, | ||
color.RGBA{0x00, 0x33, 0x99, 0xff}, | ||
color.RGBA{0x00, 0x33, 0xcc, 0xff}, | ||
color.RGBA{0x00, 0x66, 0x00, 0xff}, | ||
color.RGBA{0x00, 0x66, 0x33, 0xff}, | ||
color.RGBA{0x00, 0x66, 0x66, 0xff}, | ||
color.RGBA{0x00, 0x66, 0x99, 0xff}, | ||
color.RGBA{0x00, 0x66, 0xcc, 0xff}, | ||
color.RGBA{0x00, 0x99, 0x00, 0xff}, | ||
color.RGBA{0x00, 0x99, 0x33, 0xff}, | ||
color.RGBA{0x00, 0x99, 0x66, 0xff}, | ||
color.RGBA{0x00, 0x99, 0x99, 0xff}, | ||
color.RGBA{0x00, 0x99, 0xcc, 0xff}, | ||
color.RGBA{0x00, 0xcc, 0x00, 0xff}, | ||
color.RGBA{0x00, 0xcc, 0x33, 0xff}, | ||
color.RGBA{0x00, 0xcc, 0x66, 0xff}, | ||
color.RGBA{0x00, 0xcc, 0x99, 0xff}, | ||
color.RGBA{0x00, 0xcc, 0xcc, 0xff}, | ||
color.RGBA{0x33, 0x00, 0x00, 0xff}, | ||
color.RGBA{0x33, 0x00, 0x33, 0xff}, | ||
color.RGBA{0x33, 0x00, 0x66, 0xff}, | ||
color.RGBA{0x33, 0x00, 0x99, 0xff}, | ||
color.RGBA{0x33, 0x00, 0xcc, 0xff}, | ||
color.RGBA{0x33, 0x33, 0x00, 0xff}, | ||
color.RGBA{0x33, 0x33, 0x33, 0xff}, | ||
color.RGBA{0x33, 0x33, 0x66, 0xff}, | ||
color.RGBA{0x33, 0x33, 0x99, 0xff}, | ||
color.RGBA{0x33, 0x33, 0xcc, 0xff}, | ||
color.RGBA{0x33, 0x66, 0x00, 0xff}, | ||
color.RGBA{0x33, 0x66, 0x33, 0xff}, | ||
color.RGBA{0x33, 0x66, 0x66, 0xff}, | ||
color.RGBA{0x33, 0x66, 0x99, 0xff}, | ||
color.RGBA{0x33, 0x66, 0xcc, 0xff}, | ||
color.RGBA{0x33, 0x99, 0x00, 0xff}, | ||
color.RGBA{0x33, 0x99, 0x33, 0xff}, | ||
color.RGBA{0x33, 0x99, 0x66, 0xff}, | ||
color.RGBA{0x33, 0x99, 0x99, 0xff}, | ||
color.RGBA{0x33, 0x99, 0xcc, 0xff}, | ||
color.RGBA{0x33, 0xcc, 0x00, 0xff}, | ||
color.RGBA{0x33, 0xcc, 0x33, 0xff}, | ||
color.RGBA{0x33, 0xcc, 0x66, 0xff}, | ||
color.RGBA{0x33, 0xcc, 0x99, 0xff}, | ||
color.RGBA{0x33, 0xcc, 0xcc, 0xff}, | ||
color.RGBA{0x66, 0x00, 0x00, 0xff}, | ||
color.RGBA{0x66, 0x00, 0x33, 0xff}, | ||
color.RGBA{0x66, 0x00, 0x66, 0xff}, | ||
color.RGBA{0x66, 0x00, 0x99, 0xff}, | ||
color.RGBA{0x66, 0x00, 0xcc, 0xff}, | ||
color.RGBA{0x66, 0x33, 0x00, 0xff}, | ||
color.RGBA{0x66, 0x33, 0x33, 0xff}, | ||
color.RGBA{0x66, 0x33, 0x66, 0xff}, | ||
color.RGBA{0x66, 0x33, 0x99, 0xff}, | ||
color.RGBA{0x66, 0x33, 0xcc, 0xff}, | ||
color.RGBA{0x66, 0x66, 0x00, 0xff}, | ||
color.RGBA{0x66, 0x66, 0x33, 0xff}, | ||
color.RGBA{0x66, 0x66, 0x66, 0xff}, | ||
color.RGBA{0x66, 0x66, 0x99, 0xff}, | ||
color.RGBA{0x66, 0x66, 0xcc, 0xff}, | ||
color.RGBA{0x66, 0x99, 0x00, 0xff}, | ||
color.RGBA{0x66, 0x99, 0x33, 0xff}, | ||
color.RGBA{0x66, 0x99, 0x66, 0xff}, | ||
color.RGBA{0x66, 0x99, 0x99, 0xff}, | ||
color.RGBA{0x66, 0x99, 0xcc, 0xff}, | ||
color.RGBA{0x66, 0xcc, 0x00, 0xff}, | ||
color.RGBA{0x66, 0xcc, 0x33, 0xff}, | ||
color.RGBA{0x66, 0xcc, 0x66, 0xff}, | ||
color.RGBA{0x66, 0xcc, 0x99, 0xff}, | ||
color.RGBA{0x66, 0xcc, 0xcc, 0xff}, | ||
color.RGBA{0x99, 0x00, 0x00, 0xff}, | ||
color.RGBA{0x99, 0x00, 0x33, 0xff}, | ||
color.RGBA{0x99, 0x00, 0x66, 0xff}, | ||
color.RGBA{0x99, 0x00, 0x99, 0xff}, | ||
color.RGBA{0x99, 0x00, 0xcc, 0xff}, | ||
color.RGBA{0x99, 0x33, 0x00, 0xff}, | ||
color.RGBA{0x99, 0x33, 0x33, 0xff}, | ||
color.RGBA{0x99, 0x33, 0x66, 0xff}, | ||
color.RGBA{0x99, 0x33, 0x99, 0xff}, | ||
color.RGBA{0x99, 0x33, 0xcc, 0xff}, | ||
color.RGBA{0x99, 0x66, 0x00, 0xff}, | ||
color.RGBA{0x99, 0x66, 0x33, 0xff}, | ||
color.RGBA{0x99, 0x66, 0x66, 0xff}, | ||
color.RGBA{0x99, 0x66, 0x99, 0xff}, | ||
color.RGBA{0x99, 0x66, 0xcc, 0xff}, | ||
color.RGBA{0x99, 0x99, 0x00, 0xff}, | ||
color.RGBA{0x99, 0x99, 0x33, 0xff}, | ||
color.RGBA{0x99, 0x99, 0x66, 0xff}, | ||
color.RGBA{0x99, 0x99, 0x99, 0xff}, | ||
color.RGBA{0x99, 0x99, 0xcc, 0xff}, | ||
color.RGBA{0x99, 0xcc, 0x00, 0xff}, | ||
color.RGBA{0x99, 0xcc, 0x33, 0xff}, | ||
color.RGBA{0x99, 0xcc, 0x66, 0xff}, | ||
color.RGBA{0x99, 0xcc, 0x99, 0xff}, | ||
color.RGBA{0x99, 0xcc, 0xcc, 0xff}, | ||
color.RGBA{0xcc, 0x00, 0x00, 0xff}, | ||
color.RGBA{0xcc, 0x00, 0x33, 0xff}, | ||
color.RGBA{0xcc, 0x00, 0x66, 0xff}, | ||
color.RGBA{0xcc, 0x00, 0x99, 0xff}, | ||
color.RGBA{0xcc, 0x00, 0xcc, 0xff}, | ||
color.RGBA{0xcc, 0x33, 0x00, 0xff}, | ||
color.RGBA{0xcc, 0x33, 0x33, 0xff}, | ||
color.RGBA{0xcc, 0x33, 0x66, 0xff}, | ||
color.RGBA{0xcc, 0x33, 0x99, 0xff}, | ||
color.RGBA{0xcc, 0x33, 0xcc, 0xff}, | ||
color.RGBA{0xcc, 0x66, 0x00, 0xff}, | ||
color.RGBA{0xcc, 0x66, 0x33, 0xff}, | ||
color.RGBA{0xcc, 0x66, 0x66, 0xff}, | ||
color.RGBA{0xcc, 0x66, 0x99, 0xff}, | ||
color.RGBA{0xcc, 0x66, 0xcc, 0xff}, | ||
color.RGBA{0xcc, 0x99, 0x00, 0xff}, | ||
color.RGBA{0xcc, 0x99, 0x33, 0xff}, | ||
color.RGBA{0xcc, 0x99, 0x66, 0xff}, | ||
color.RGBA{0xcc, 0x99, 0x99, 0xff}, | ||
color.RGBA{0xcc, 0x99, 0xcc, 0xff}, | ||
color.RGBA{0xcc, 0xcc, 0x00, 0xff}, | ||
color.RGBA{0xcc, 0xcc, 0x33, 0xff}, | ||
color.RGBA{0xcc, 0xcc, 0x66, 0xff}, | ||
color.RGBA{0xcc, 0xcc, 0x99, 0xff}, | ||
color.RGBA{0xcc, 0xcc, 0xcc, 0xff}, | ||
} |
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@@ -0,0 +1,141 @@ | ||
// Copyright 2021 The Gitea Authors. All rights reserved. | ||
// Use of this source code is governed by a MIT-style | ||
// license that can be found in the LICENSE file. | ||
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// Copied and modified from https://github.com/issue9/identicon/ (MIT License) | ||
// Generate pseudo-random avatars by IP, E-mail, etc. | ||
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package identicon | ||
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import ( | ||
"crypto/sha256" | ||
"fmt" | ||
"image" | ||
"image/color" | ||
) | ||
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const minImageSize = 16 | ||
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// Identicon is used to generate pseudo-random avatars | ||
type Identicon struct { | ||
foreColors []color.Color | ||
backColor color.Color | ||
size int | ||
rect image.Rectangle | ||
} | ||
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// New returns an Identicon struct with the correct settings | ||
// size image size | ||
// back background color | ||
// fore all possible foreground colors. only one foreground color will be picked randomly for one image | ||
func New(size int, back color.Color, fore ...color.Color) (*Identicon, error) { | ||
if len(fore) == 0 { | ||
return nil, fmt.Errorf("foreground is not set") | ||
} | ||
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if size < minImageSize { | ||
return nil, fmt.Errorf("size %d is smaller than min size %d", size, minImageSize) | ||
} | ||
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return &Identicon{ | ||
foreColors: fore, | ||
backColor: back, | ||
size: size, | ||
rect: image.Rect(0, 0, size, size), | ||
}, nil | ||
} | ||
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// Make generates an avatar by data | ||
func (i *Identicon) Make(data []byte) image.Image { | ||
h := sha256.New() | ||
h.Write(data) | ||
sum := h.Sum(nil) | ||
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b1 := int(sum[0]+sum[1]+sum[2]) % len(blocks) | ||
b2 := int(sum[3]+sum[4]+sum[5]) % len(blocks) | ||
c := int(sum[6]+sum[7]+sum[8]) % len(centerBlocks) | ||
b1Angle := int(sum[9]+sum[10]) % 4 | ||
b2Angle := int(sum[11]+sum[12]) % 4 | ||
foreColor := int(sum[11]+sum[12]+sum[15]) % len(i.foreColors) | ||
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return i.render(c, b1, b2, b1Angle, b2Angle, foreColor) | ||
} | ||
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func (i *Identicon) render(c, b1, b2, b1Angle, b2Angle, foreColor int) image.Image { | ||
p := image.NewPaletted(i.rect, []color.Color{i.backColor, i.foreColors[foreColor]}) | ||
drawBlocks(p, i.size, centerBlocks[c], blocks[b1], blocks[b2], b1Angle, b2Angle) | ||
return p | ||
} | ||
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/* | ||
# Algorithm | ||
Origin: An image is splitted into 9 areas | ||
``` | ||
------------- | ||
| 1 | 2 | 3 | | ||
------------- | ||
| 4 | 5 | 6 | | ||
------------- | ||
| 7 | 8 | 9 | | ||
------------- | ||
``` | ||
Area 1/3/9/7 use a 90-degree rotating pattern. | ||
Area 1/3/9/7 use another 90-degree rotating pattern. | ||
Area 5 uses a random patter. | ||
The Patched Fix: make the image left-right mirrored to get rid of something like "swastika" | ||
*/ | ||
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// draw blocks to the paletted | ||
// c: the block drawer for the center block | ||
// b1,b2: the block drawers for other blocks (around the center block) | ||
// b1Angle,b2Angle: the angle for the rotation of b1/b2 | ||
func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, b1Angle, b2Angle int) { | ||
nextAngle := func(a int) int { | ||
return (a + 1) % 4 | ||
} | ||
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padding := (size % 3) / 2 // in cased the size can not be aligned by 3 blocks. | ||
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blockSize := size / 3 | ||
twoBlockSize := 2 * blockSize | ||
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// center | ||
c(p, blockSize+padding, blockSize+padding, blockSize, 0) | ||
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// left top (1) | ||
b1(p, 0+padding, 0+padding, blockSize, b1Angle) | ||
// center top (2) | ||
b2(p, blockSize+padding, 0+padding, blockSize, b2Angle) | ||
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b1Angle = nextAngle(b1Angle) | ||
b2Angle = nextAngle(b2Angle) | ||
// right top (3) | ||
// b1(p, twoBlockSize+padding, 0+padding, blockSize, b1Angle) | ||
// right middle (6) | ||
// b2(p, twoBlockSize+padding, blockSize+padding, blockSize, b2Angle) | ||
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b1Angle = nextAngle(b1Angle) | ||
b2Angle = nextAngle(b2Angle) | ||
// right bottom (9) | ||
// b1(p, twoBlockSize+padding, twoBlockSize+padding, blockSize, b1Angle) | ||
// center bottom (8) | ||
b2(p, blockSize+padding, twoBlockSize+padding, blockSize, b2Angle) | ||
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b1Angle = nextAngle(b1Angle) | ||
b2Angle = nextAngle(b2Angle) | ||
// lef bottom (7) | ||
b1(p, 0+padding, twoBlockSize+padding, blockSize, b1Angle) | ||
// left middle (4) | ||
b2(p, 0+padding, blockSize+padding, blockSize, b2Angle) | ||
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// then we make it left-right mirror, so we didn't draw 3/6/9 before | ||
for x := 0; x < size/2; x++ { | ||
for y := 0; y < size; y++ { | ||
p.SetColorIndex(size-x, y, p.ColorIndexAt(x, y)) | ||
} | ||
} | ||
} |
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// Copyright 2021 The Gitea Authors. All rights reserved. | ||
// Use of this source code is governed by a MIT-style | ||
// license that can be found in the LICENSE file. | ||
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//go:build test_avatar_identicon | ||
// +build test_avatar_identicon | ||
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package identicon | ||
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import ( | ||
"image/color" | ||
"image/png" | ||
"os" | ||
"strconv" | ||
"testing" | ||
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"github.com/stretchr/testify/assert" | ||
) | ||
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func TestGenerate(t *testing.T) { | ||
dir, _ := os.Getwd() | ||
dir = dir + "/testdata" | ||
if st, err := os.Stat(dir); err != nil || !st.IsDir() { | ||
t.Errorf("can not save generated images to %s", dir) | ||
} | ||
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backColor := color.White | ||
imgMaker, err := New(64, backColor, DarkColors...) | ||
assert.NoError(t, err) | ||
for i := 0; i < 100; i++ { | ||
s := strconv.Itoa(i) | ||
img := imgMaker.Make([]byte(s)) | ||
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f, err := os.Create(dir + "/" + s + ".png") | ||
if !assert.NoError(t, err) { | ||
continue | ||
} | ||
defer f.Close() | ||
err = png.Encode(f, img) | ||
assert.NoError(t, err) | ||
} | ||
} |
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@@ -0,0 +1,69 @@ | ||
// Copyright 2021 The Gitea Authors. All rights reserved. | ||
// Use of this source code is governed by a MIT-style | ||
// license that can be found in the LICENSE file. | ||
|
||
// Copied and modified from https://github.com/issue9/identicon/ (MIT License) | ||
|
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package identicon | ||
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var ( | ||
// cos(0),cos(90),cos(180),cos(270) | ||
cos = []int{1, 0, -1, 0} | ||
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// sin(0),sin(90),sin(180),sin(270) | ||
sin = []int{0, 1, 0, -1} | ||
) | ||
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// rotate the points by center point (x,y) | ||
// angle: [0,1,2,3] means [0,90,180,270] degree | ||
func rotate(points []int, x, y int, angle int) { | ||
// the angle is only used internally, and it has been guaranteed to be 0/1/2/3, so we do not check it again | ||
for i := 0; i < len(points); i += 2 { | ||
px, py := points[i]-x, points[i+1]-y | ||
points[i] = px*cos[angle] - py*sin[angle] + x | ||
points[i+1] = px*sin[angle] + py*cos[angle] + y | ||
} | ||
} | ||
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// check whether the point is inside the polygon (defined by the points) | ||
// the first and the last point must be the same | ||
func pointInPolygon(x, y int, polygonPoints []int) bool { | ||
if len(polygonPoints) < 8 { // a valid polygon must have more than 2 points | ||
return false | ||
} | ||
|
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// reference: nonzero winding rule, https://en.wikipedia.org/wiki/Nonzero-rule | ||
// split the plane into two by the check point horizontally: | ||
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|
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// y>0,includes (x>0 && y==0) | ||
// y<0,includes (x<0 && y==0) | ||
// | ||
// then scan every point in the polygon. | ||
// | ||
// if current point and previous point are in different planes (eg: curY>0 && prevY<0), | ||
// check the clock-direction from previous point to current point (use check point as origin). | ||
// if the direction is clockwise, then r++, otherwise then r-- | ||
// finally, if 2==abs(r), then the check point is inside the polygon | ||
|
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r := 0 | ||
prevX, prevY := polygonPoints[0], polygonPoints[1] | ||
prev := (prevY > y) || ((prevX > x) && (prevY == y)) | ||
for i := 2; i < len(polygonPoints); i += 2 { | ||
currX, currY := polygonPoints[i], polygonPoints[i+1] | ||
curr := (currY > y) || ((currX > x) && (currY == y)) | ||
|
||
if curr == prev { | ||
prevX, prevY = currX, currY | ||
continue | ||
} | ||
|
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if mul := (prevX-x)*(currY-y) - (currX-x)*(prevY-y); mul >= 0 { | ||
r++ | ||
} else { // mul < 0 | ||
r-- | ||
} | ||
prevX, prevY = currX, currY | ||
prev = curr | ||
} | ||
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return r == 2 || r == -2 | ||
} |
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